core/vm, crypto/blake2b: add SSE, AVX and AVX2 code

14 files changed, 2560 insertions, 164 deletions

diff --git a/core/vm/contracts.go b/core/vm/contracts.go
index 1ddfac455..875054f89 100644
--- a/core/vm/contracts.go
+++ b/core/vm/contracts.go
@@ -438,63 +438,60 @@ func (c *bn256PairingByzantium) Run(input []byte) ([]byte, error) {
 type blake2F struct{}
 
 func (c *blake2F) RequiredGas(input []byte) uint64 {
+	// If the input is malformed, we can't calculate the gas, return 0 and let the
+	// actual call choke and fault.
 	if len(input) != blake2FInputLength {
-		// Input is malformed, we can't read the number of rounds.
-		// Precompile can't be executed so we set its price to 0.
 		return 0
 	}
-
-	rounds := binary.BigEndian.Uint32(input[0:4])
-	return uint64(rounds)
+	return uint64(binary.BigEndian.Uint32(input[0:4]))
 }
 
-const blake2FInputLength = 213
-const blake2FFinalBlockBytes = byte(1)
-const blake2FNonFinalBlockBytes = byte(0)
-
-var errBlake2FIncorrectInputLength = errors.New(
-	"input length for Blake2 F precompile should be exactly 213 bytes",
+const (
+	blake2FInputLength        = 213
+	blake2FFinalBlockBytes    = byte(1)
+	blake2FNonFinalBlockBytes = byte(0)
 )
 
-var errBlake2FIncorrectFinalBlockIndicator = errors.New(
-	"incorrect final block indicator flag",
+var (
+	errBlake2FInvalidInputLength = errors.New("invalid input length")
+	errBlake2FInvalidFinalFlag   = errors.New("invalid final flag")
 )
 
 func (c *blake2F) Run(input []byte) ([]byte, error) {
+	// Make sure the input is valid (correct lenth and final flag)
 	if len(input) != blake2FInputLength {
-		return nil, errBlake2FIncorrectInputLength
+		return nil, errBlake2FInvalidInputLength
 	}
 	if input[212] != blake2FNonFinalBlockBytes && input[212] != blake2FFinalBlockBytes {
-		return nil, errBlake2FIncorrectFinalBlockIndicator
+		return nil, errBlake2FInvalidFinalFlag
 	}
+	// Parse the input into the Blake2b call parameters
+	var (
+		rounds = binary.BigEndian.Uint32(input[0:4])
+		final  = (input[212] == blake2FFinalBlockBytes)
 
-	rounds := binary.BigEndian.Uint32(input[0:4])
-
-	var h [8]uint64
+		h [8]uint64
+		m [16]uint64
+		t [2]uint64
+	)
 	for i := 0; i < 8; i++ {
 		offset := 4 + i*8
 		h[i] = binary.LittleEndian.Uint64(input[offset : offset+8])
 	}
-
-	var m [16]uint64
 	for i := 0; i < 16; i++ {
 		offset := 68 + i*8
 		m[i] = binary.LittleEndian.Uint64(input[offset : offset+8])
 	}
-
-	var t [2]uint64
 	t[0] = binary.LittleEndian.Uint64(input[196:204])
 	t[1] = binary.LittleEndian.Uint64(input[204:212])
 
-	f := (input[212] == blake2FFinalBlockBytes)
+	// Execute the compression function, extract and return the result
+	blake2b.F(&h, m, t, final, rounds)
 
-	blake2b.F(&h, m, t, f, rounds)
-
-	var output [64]byte
+	output := make([]byte, 64)
 	for i := 0; i < 8; i++ {
 		offset := i * 8
 		binary.LittleEndian.PutUint64(output[offset:offset+8], h[i])
 	}
-
-	return output[:], nil
+	return output, nil
 }
diff --git a/core/vm/contracts_test.go b/core/vm/contracts_test.go
index 64c8c8b44..ae95b4462 100644
--- a/core/vm/contracts_test.go
+++ b/core/vm/contracts_test.go
@@ -349,22 +349,22 @@ var bn256PairingTests = []precompiledTest{
 var blake2FMalformedInputTests = []precompiledFailureTest{
 	{
 		input:         "",
-		expectedError: errBlake2FIncorrectInputLength,
+		expectedError: errBlake2FInvalidInputLength,
 		name:          "vector 0: empty input",
 	},
 	{
 		input:         "00000c48c9bdf267e6096a3ba7ca8485ae67bb2bf894fe72f36e3cf1361d5f3af54fa5d182e6ad7f520e511f6c3e2b8c68059b6bbd41fbabd9831f79217e1319cde05b61626300000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000300000000000000000000000000000001",
-		expectedError: errBlake2FIncorrectInputLength,
+		expectedError: errBlake2FInvalidInputLength,
 		name:          "vector 1: less than 213 bytes input",
 	},
 	{
 		input:         "000000000c48c9bdf267e6096a3ba7ca8485ae67bb2bf894fe72f36e3cf1361d5f3af54fa5d182e6ad7f520e511f6c3e2b8c68059b6bbd41fbabd9831f79217e1319cde05b61626300000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000300000000000000000000000000000001",
-		expectedError: errBlake2FIncorrectInputLength,
+		expectedError: errBlake2FInvalidInputLength,
 		name:          "vector 2: more than 213 bytes input",
 	},
 	{
 		input:         "0000000c48c9bdf267e6096a3ba7ca8485ae67bb2bf894fe72f36e3cf1361d5f3af54fa5d182e6ad7f520e511f6c3e2b8c68059b6bbd41fbabd9831f79217e1319cde05b61626300000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000300000000000000000000000000000002",
-		expectedError: errBlake2FIncorrectFinalBlockIndicator,
+		expectedError: errBlake2FInvalidFinalFlag,
 		name:          "vector 3: malformed final block indicator flag",
 	},
 }
@@ -391,6 +391,11 @@ var blake2FTests = []precompiledTest{
 		expected: "b63a380cb2897d521994a85234ee2c181b5f844d2c624c002677e9703449d2fba551b3a8333bcdf5f2f7e08993d53923de3d64fcc68c034e717b9293fed7a421",
 		name:     "vector 7",
 	},
+	{
+		input:    "007A120048c9bdf267e6096a3ba7ca8485ae67bb2bf894fe72f36e3cf1361d5f3af54fa5d182e6ad7f520e511f6c3e2b8c68059b6bbd41fbabd9831f79217e1319cde05b61626300000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000300000000000000000000000000000001",
+		expected: "6d2ce9e534d50e18ff866ae92d70cceba79bbcd14c63819fe48752c8aca87a4bb7dcc230d22a4047f0486cfcfb50a17b24b2899eb8fca370f22240adb5170189",
+		name:     "vector 8",
+	},
 }
 
 func testPrecompiled(addr string, test precompiledTest, t *testing.T) {
diff --git a/crypto/blake2b/blake2b.go b/crypto/blake2b/blake2b.go
new file mode 100644
index 000000000..5da50cab6
--- /dev/null
+++ b/crypto/blake2b/blake2b.go
@@ -0,0 +1,319 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package blake2b implements the BLAKE2b hash algorithm defined by RFC 7693
+// and the extendable output function (XOF) BLAKE2Xb.
+//
+// For a detailed specification of BLAKE2b see https://blake2.net/blake2.pdf
+// and for BLAKE2Xb see https://blake2.net/blake2x.pdf
+//
+// If you aren't sure which function you need, use BLAKE2b (Sum512 or New512).
+// If you need a secret-key MAC (message authentication code), use the New512
+// function with a non-nil key.
+//
+// BLAKE2X is a construction to compute hash values larger than 64 bytes. It
+// can produce hash values between 0 and 4 GiB.
+package blake2b
+
+import (
+	"encoding/binary"
+	"errors"
+	"hash"
+)
+
+const (
+	// The blocksize of BLAKE2b in bytes.
+	BlockSize = 128
+	// The hash size of BLAKE2b-512 in bytes.
+	Size = 64
+	// The hash size of BLAKE2b-384 in bytes.
+	Size384 = 48
+	// The hash size of BLAKE2b-256 in bytes.
+	Size256 = 32
+)
+
+var (
+	useAVX2 bool
+	useAVX  bool
+	useSSE4 bool
+)
+
+var (
+	errKeySize  = errors.New("blake2b: invalid key size")
+	errHashSize = errors.New("blake2b: invalid hash size")
+)
+
+var iv = [8]uint64{
+	0x6a09e667f3bcc908, 0xbb67ae8584caa73b, 0x3c6ef372fe94f82b, 0xa54ff53a5f1d36f1,
+	0x510e527fade682d1, 0x9b05688c2b3e6c1f, 0x1f83d9abfb41bd6b, 0x5be0cd19137e2179,
+}
+
+// Sum512 returns the BLAKE2b-512 checksum of the data.
+func Sum512(data []byte) [Size]byte {
+	var sum [Size]byte
+	checkSum(&sum, Size, data)
+	return sum
+}
+
+// Sum384 returns the BLAKE2b-384 checksum of the data.
+func Sum384(data []byte) [Size384]byte {
+	var sum [Size]byte
+	var sum384 [Size384]byte
+	checkSum(&sum, Size384, data)
+	copy(sum384[:], sum[:Size384])
+	return sum384
+}
+
+// Sum256 returns the BLAKE2b-256 checksum of the data.
+func Sum256(data []byte) [Size256]byte {
+	var sum [Size]byte
+	var sum256 [Size256]byte
+	checkSum(&sum, Size256, data)
+	copy(sum256[:], sum[:Size256])
+	return sum256
+}
+
+// New512 returns a new hash.Hash computing the BLAKE2b-512 checksum. A non-nil
+// key turns the hash into a MAC. The key must be between zero and 64 bytes long.
+func New512(key []byte) (hash.Hash, error) { return newDigest(Size, key) }
+
+// New384 returns a new hash.Hash computing the BLAKE2b-384 checksum. A non-nil
+// key turns the hash into a MAC. The key must be between zero and 64 bytes long.
+func New384(key []byte) (hash.Hash, error) { return newDigest(Size384, key) }
+
+// New256 returns a new hash.Hash computing the BLAKE2b-256 checksum. A non-nil
+// key turns the hash into a MAC. The key must be between zero and 64 bytes long.
+func New256(key []byte) (hash.Hash, error) { return newDigest(Size256, key) }
+
+// New returns a new hash.Hash computing the BLAKE2b checksum with a custom length.
+// A non-nil key turns the hash into a MAC. The key must be between zero and 64 bytes long.
+// The hash size can be a value between 1 and 64 but it is highly recommended to use
+// values equal or greater than:
+// - 32 if BLAKE2b is used as a hash function (The key is zero bytes long).
+// - 16 if BLAKE2b is used as a MAC function (The key is at least 16 bytes long).
+// When the key is nil, the returned hash.Hash implements BinaryMarshaler
+// and BinaryUnmarshaler for state (de)serialization as documented by hash.Hash.
+func New(size int, key []byte) (hash.Hash, error) { return newDigest(size, key) }
+
+// F is a compression function for BLAKE2b. It takes as an argument the state
+// vector `h`, message block vector `m`, offset counter `t`, final block indicator
+// flag `f`, and number of rounds `rounds`. The state vector provided as the first
+// parameter is modified by the function.
+func F(h *[8]uint64, m [16]uint64, c [2]uint64, final bool, rounds uint32) {
+	var flag uint64
+	if final {
+		flag = 0xFFFFFFFFFFFFFFFF
+	}
+	f(h, &m, c[0], c[1], flag, uint64(rounds))
+}
+
+func newDigest(hashSize int, key []byte) (*digest, error) {
+	if hashSize < 1 || hashSize > Size {
+		return nil, errHashSize
+	}
+	if len(key) > Size {
+		return nil, errKeySize
+	}
+	d := &digest{
+		size:   hashSize,
+		keyLen: len(key),
+	}
+	copy(d.key[:], key)
+	d.Reset()
+	return d, nil
+}
+
+func checkSum(sum *[Size]byte, hashSize int, data []byte) {
+	h := iv
+	h[0] ^= uint64(hashSize) | (1 << 16) | (1 << 24)
+	var c [2]uint64
+
+	if length := len(data); length > BlockSize {
+		n := length &^ (BlockSize - 1)
+		if length == n {
+			n -= BlockSize
+		}
+		hashBlocks(&h, &c, 0, data[:n])
+		data = data[n:]
+	}
+
+	var block [BlockSize]byte
+	offset := copy(block[:], data)
+	remaining := uint64(BlockSize - offset)
+	if c[0] < remaining {
+		c[1]--
+	}
+	c[0] -= remaining
+
+	hashBlocks(&h, &c, 0xFFFFFFFFFFFFFFFF, block[:])
+
+	for i, v := range h[:(hashSize+7)/8] {
+		binary.LittleEndian.PutUint64(sum[8*i:], v)
+	}
+}
+
+func hashBlocks(h *[8]uint64, c *[2]uint64, flag uint64, blocks []byte) {
+	var m [16]uint64
+	c0, c1 := c[0], c[1]
+
+	for i := 0; i < len(blocks); {
+		c0 += BlockSize
+		if c0 < BlockSize {
+			c1++
+		}
+		for j := range m {
+			m[j] = binary.LittleEndian.Uint64(blocks[i:])
+			i += 8
+		}
+		f(h, &m, c0, c1, flag, 12)
+	}
+	c[0], c[1] = c0, c1
+}
+
+type digest struct {
+	h      [8]uint64
+	c      [2]uint64
+	size   int
+	block  [BlockSize]byte
+	offset int
+
+	key    [BlockSize]byte
+	keyLen int
+}
+
+const (
+	magic         = "b2b"
+	marshaledSize = len(magic) + 8*8 + 2*8 + 1 + BlockSize + 1
+)
+
+func (d *digest) MarshalBinary() ([]byte, error) {
+	if d.keyLen != 0 {
+		return nil, errors.New("crypto/blake2b: cannot marshal MACs")
+	}
+	b := make([]byte, 0, marshaledSize)
+	b = append(b, magic...)
+	for i := 0; i < 8; i++ {
+		b = appendUint64(b, d.h[i])
+	}
+	b = appendUint64(b, d.c[0])
+	b = appendUint64(b, d.c[1])
+	// Maximum value for size is 64
+	b = append(b, byte(d.size))
+	b = append(b, d.block[:]...)
+	b = append(b, byte(d.offset))
+	return b, nil
+}
+
+func (d *digest) UnmarshalBinary(b []byte) error {
+	if len(b) < len(magic) || string(b[:len(magic)]) != magic {
+		return errors.New("crypto/blake2b: invalid hash state identifier")
+	}
+	if len(b) != marshaledSize {
+		return errors.New("crypto/blake2b: invalid hash state size")
+	}
+	b = b[len(magic):]
+	for i := 0; i < 8; i++ {
+		b, d.h[i] = consumeUint64(b)
+	}
+	b, d.c[0] = consumeUint64(b)
+	b, d.c[1] = consumeUint64(b)
+	d.size = int(b[0])
+	b = b[1:]
+	copy(d.block[:], b[:BlockSize])
+	b = b[BlockSize:]
+	d.offset = int(b[0])
+	return nil
+}
+
+func (d *digest) BlockSize() int { return BlockSize }
+
+func (d *digest) Size() int { return d.size }
+
+func (d *digest) Reset() {
+	d.h = iv
+	d.h[0] ^= uint64(d.size) | (uint64(d.keyLen) << 8) | (1 << 16) | (1 << 24)
+	d.offset, d.c[0], d.c[1] = 0, 0, 0
+	if d.keyLen > 0 {
+		d.block = d.key
+		d.offset = BlockSize
+	}
+}
+
+func (d *digest) Write(p []byte) (n int, err error) {
+	n = len(p)
+
+	if d.offset > 0 {
+		remaining := BlockSize - d.offset
+		if n <= remaining {
+			d.offset += copy(d.block[d.offset:], p)
+			return
+		}
+		copy(d.block[d.offset:], p[:remaining])
+		hashBlocks(&d.h, &d.c, 0, d.block[:])
+		d.offset = 0
+		p = p[remaining:]
+	}
+
+	if length := len(p); length > BlockSize {
+		nn := length &^ (BlockSize - 1)
+		if length == nn {
+			nn -= BlockSize
+		}
+		hashBlocks(&d.h, &d.c, 0, p[:nn])
+		p = p[nn:]
+	}
+
+	if len(p) > 0 {
+		d.offset += copy(d.block[:], p)
+	}
+
+	return
+}
+
+func (d *digest) Sum(sum []byte) []byte {
+	var hash [Size]byte
+	d.finalize(&hash)
+	return append(sum, hash[:d.size]...)
+}
+
+func (d *digest) finalize(hash *[Size]byte) {
+	var block [BlockSize]byte
+	copy(block[:], d.block[:d.offset])
+	remaining := uint64(BlockSize - d.offset)
+
+	c := d.c
+	if c[0] < remaining {
+		c[1]--
+	}
+	c[0] -= remaining
+
+	h := d.h
+	hashBlocks(&h, &c, 0xFFFFFFFFFFFFFFFF, block[:])
+
+	for i, v := range h {
+		binary.LittleEndian.PutUint64(hash[8*i:], v)
+	}
+}
+
+func appendUint64(b []byte, x uint64) []byte {
+	var a [8]byte
+	binary.BigEndian.PutUint64(a[:], x)
+	return append(b, a[:]...)
+}
+
+func appendUint32(b []byte, x uint32) []byte {
+	var a [4]byte
+	binary.BigEndian.PutUint32(a[:], x)
+	return append(b, a[:]...)
+}
+
+func consumeUint64(b []byte) ([]byte, uint64) {
+	x := binary.BigEndian.Uint64(b)
+	return b[8:], x
+}
+
+func consumeUint32(b []byte) ([]byte, uint32) {
+	x := binary.BigEndian.Uint32(b)
+	return b[4:], x
+}
diff --git a/crypto/blake2b/blake2bAVX2_amd64.go b/crypto/blake2b/blake2bAVX2_amd64.go
new file mode 100644
index 000000000..0d52b1869
--- /dev/null
+++ b/crypto/blake2b/blake2bAVX2_amd64.go
@@ -0,0 +1,37 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build go1.7,amd64,!gccgo,!appengine
+
+package blake2b
+
+import "golang.org/x/sys/cpu"
+
+func init() {
+	useAVX2 = cpu.X86.HasAVX2
+	useAVX = cpu.X86.HasAVX
+	useSSE4 = cpu.X86.HasSSE41
+}
+
+//go:noescape
+func fAVX2(h *[8]uint64, m *[16]uint64, c0, c1 uint64, flag uint64, rounds uint64)
+
+//go:noescape
+func fAVX(h *[8]uint64, m *[16]uint64, c0, c1 uint64, flag uint64, rounds uint64)
+
+//go:noescape
+func fSSE4(h *[8]uint64, m *[16]uint64, c0, c1 uint64, flag uint64, rounds uint64)
+
+func f(h *[8]uint64, m *[16]uint64, c0, c1 uint64, flag uint64, rounds uint64) {
+	switch {
+	case useAVX2:
+		fAVX2(h, m, c0, c1, flag, rounds)
+	case useAVX:
+		fAVX(h, m, c0, c1, flag, rounds)
+	case useSSE4:
+		fSSE4(h, m, c0, c1, flag, rounds)
+	default:
+		fGeneric(h, m, c0, c1, flag, rounds)
+	}
+}
diff --git a/crypto/blake2b/blake2bAVX2_amd64.s b/crypto/blake2b/blake2bAVX2_amd64.s
new file mode 100644
index 000000000..4998af37d
--- /dev/null
+++ b/crypto/blake2b/blake2bAVX2_amd64.s
@@ -0,0 +1,717 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build go1.7,amd64,!gccgo,!appengine
+
+#include "textflag.h"
+
+DATA ·AVX2_iv0<>+0x00(SB)/8, $0x6a09e667f3bcc908
+DATA ·AVX2_iv0<>+0x08(SB)/8, $0xbb67ae8584caa73b
+DATA ·AVX2_iv0<>+0x10(SB)/8, $0x3c6ef372fe94f82b
+DATA ·AVX2_iv0<>+0x18(SB)/8, $0xa54ff53a5f1d36f1
+GLOBL ·AVX2_iv0<>(SB), (NOPTR+RODATA), $32
+
+DATA ·AVX2_iv1<>+0x00(SB)/8, $0x510e527fade682d1
+DATA ·AVX2_iv1<>+0x08(SB)/8, $0x9b05688c2b3e6c1f
+DATA ·AVX2_iv1<>+0x10(SB)/8, $0x1f83d9abfb41bd6b
+DATA ·AVX2_iv1<>+0x18(SB)/8, $0x5be0cd19137e2179
+GLOBL ·AVX2_iv1<>(SB), (NOPTR+RODATA), $32
+
+DATA ·AVX2_c40<>+0x00(SB)/8, $0x0201000706050403
+DATA ·AVX2_c40<>+0x08(SB)/8, $0x0a09080f0e0d0c0b
+DATA ·AVX2_c40<>+0x10(SB)/8, $0x0201000706050403
+DATA ·AVX2_c40<>+0x18(SB)/8, $0x0a09080f0e0d0c0b
+GLOBL ·AVX2_c40<>(SB), (NOPTR+RODATA), $32
+
+DATA ·AVX2_c48<>+0x00(SB)/8, $0x0100070605040302
+DATA ·AVX2_c48<>+0x08(SB)/8, $0x09080f0e0d0c0b0a
+DATA ·AVX2_c48<>+0x10(SB)/8, $0x0100070605040302
+DATA ·AVX2_c48<>+0x18(SB)/8, $0x09080f0e0d0c0b0a
+GLOBL ·AVX2_c48<>(SB), (NOPTR+RODATA), $32
+
+DATA ·AVX_iv0<>+0x00(SB)/8, $0x6a09e667f3bcc908
+DATA ·AVX_iv0<>+0x08(SB)/8, $0xbb67ae8584caa73b
+GLOBL ·AVX_iv0<>(SB), (NOPTR+RODATA), $16
+
+DATA ·AVX_iv1<>+0x00(SB)/8, $0x3c6ef372fe94f82b
+DATA ·AVX_iv1<>+0x08(SB)/8, $0xa54ff53a5f1d36f1
+GLOBL ·AVX_iv1<>(SB), (NOPTR+RODATA), $16
+
+DATA ·AVX_iv2<>+0x00(SB)/8, $0x510e527fade682d1
+DATA ·AVX_iv2<>+0x08(SB)/8, $0x9b05688c2b3e6c1f
+GLOBL ·AVX_iv2<>(SB), (NOPTR+RODATA), $16
+
+DATA ·AVX_iv3<>+0x00(SB)/8, $0x1f83d9abfb41bd6b
+DATA ·AVX_iv3<>+0x08(SB)/8, $0x5be0cd19137e2179
+GLOBL ·AVX_iv3<>(SB), (NOPTR+RODATA), $16
+
+DATA ·AVX_c40<>+0x00(SB)/8, $0x0201000706050403
+DATA ·AVX_c40<>+0x08(SB)/8, $0x0a09080f0e0d0c0b
+GLOBL ·AVX_c40<>(SB), (NOPTR+RODATA), $16
+
+DATA ·AVX_c48<>+0x00(SB)/8, $0x0100070605040302
+DATA ·AVX_c48<>+0x08(SB)/8, $0x09080f0e0d0c0b0a
+GLOBL ·AVX_c48<>(SB), (NOPTR+RODATA), $16
+
+#define VPERMQ_0x39_Y1_Y1 BYTE $0xc4; BYTE $0xe3; BYTE $0xfd; BYTE $0x00; BYTE $0xc9; BYTE $0x39
+#define VPERMQ_0x93_Y1_Y1 BYTE $0xc4; BYTE $0xe3; BYTE $0xfd; BYTE $0x00; BYTE $0xc9; BYTE $0x93
+#define VPERMQ_0x4E_Y2_Y2 BYTE $0xc4; BYTE $0xe3; BYTE $0xfd; BYTE $0x00; BYTE $0xd2; BYTE $0x4e
+#define VPERMQ_0x93_Y3_Y3 BYTE $0xc4; BYTE $0xe3; BYTE $0xfd; BYTE $0x00; BYTE $0xdb; BYTE $0x93
+#define VPERMQ_0x39_Y3_Y3 BYTE $0xc4; BYTE $0xe3; BYTE $0xfd; BYTE $0x00; BYTE $0xdb; BYTE $0x39
+
+#define ROUND_AVX2(m0, m1, m2, m3, t, c40, c48) \
+	VPADDQ  m0, Y0, Y0;   \
+	VPADDQ  Y1, Y0, Y0;   \
+	VPXOR   Y0, Y3, Y3;   \
+	VPSHUFD $-79, Y3, Y3; \
+	VPADDQ  Y3, Y2, Y2;   \
+	VPXOR   Y2, Y1, Y1;   \
+	VPSHUFB c40, Y1, Y1;  \
+	VPADDQ  m1, Y0, Y0;   \
+	VPADDQ  Y1, Y0, Y0;   \
+	VPXOR   Y0, Y3, Y3;   \
+	VPSHUFB c48, Y3, Y3;  \
+	VPADDQ  Y3, Y2, Y2;   \
+	VPXOR   Y2, Y1, Y1;   \
+	VPADDQ  Y1, Y1, t;    \
+	VPSRLQ  $63, Y1, Y1;  \
+	VPXOR   t, Y1, Y1;    \
+	VPERMQ_0x39_Y1_Y1;    \
+	VPERMQ_0x4E_Y2_Y2;    \
+	VPERMQ_0x93_Y3_Y3;    \
+	VPADDQ  m2, Y0, Y0;   \
+	VPADDQ  Y1, Y0, Y0;   \
+	VPXOR   Y0, Y3, Y3;   \
+	VPSHUFD $-79, Y3, Y3; \
+	VPADDQ  Y3, Y2, Y2;   \
+	VPXOR   Y2, Y1, Y1;   \
+	VPSHUFB c40, Y1, Y1;  \
+	VPADDQ  m3, Y0, Y0;   \
+	VPADDQ  Y1, Y0, Y0;   \
+	VPXOR   Y0, Y3, Y3;   \
+	VPSHUFB c48, Y3, Y3;  \
+	VPADDQ  Y3, Y2, Y2;   \
+	VPXOR   Y2, Y1, Y1;   \
+	VPADDQ  Y1, Y1, t;    \
+	VPSRLQ  $63, Y1, Y1;  \
+	VPXOR   t, Y1, Y1;    \
+	VPERMQ_0x39_Y3_Y3;    \
+	VPERMQ_0x4E_Y2_Y2;    \
+	VPERMQ_0x93_Y1_Y1
+
+#define VMOVQ_SI_X11_0 BYTE $0xC5; BYTE $0x7A; BYTE $0x7E; BYTE $0x1E
+#define VMOVQ_SI_X12_0 BYTE $0xC5; BYTE $0x7A; BYTE $0x7E; BYTE $0x26
+#define VMOVQ_SI_X13_0 BYTE $0xC5; BYTE $0x7A; BYTE $0x7E; BYTE $0x2E
+#define VMOVQ_SI_X14_0 BYTE $0xC5; BYTE $0x7A; BYTE $0x7E; BYTE $0x36
+#define VMOVQ_SI_X15_0 BYTE $0xC5; BYTE $0x7A; BYTE $0x7E; BYTE $0x3E
+
+#define VMOVQ_SI_X11(n) BYTE $0xC5; BYTE $0x7A; BYTE $0x7E; BYTE $0x5E; BYTE $n
+#define VMOVQ_SI_X12(n) BYTE $0xC5; BYTE $0x7A; BYTE $0x7E; BYTE $0x66; BYTE $n
+#define VMOVQ_SI_X13(n) BYTE $0xC5; BYTE $0x7A; BYTE $0x7E; BYTE $0x6E; BYTE $n
+#define VMOVQ_SI_X14(n) BYTE $0xC5; BYTE $0x7A; BYTE $0x7E; BYTE $0x76; BYTE $n
+#define VMOVQ_SI_X15(n) BYTE $0xC5; BYTE $0x7A; BYTE $0x7E; BYTE $0x7E; BYTE $n
+
+#define VPINSRQ_1_SI_X11_0 BYTE $0xC4; BYTE $0x63; BYTE $0xA1; BYTE $0x22; BYTE $0x1E; BYTE $0x01
+#define VPINSRQ_1_SI_X12_0 BYTE $0xC4; BYTE $0x63; BYTE $0x99; BYTE $0x22; BYTE $0x26; BYTE $0x01
+#define VPINSRQ_1_SI_X13_0 BYTE $0xC4; BYTE $0x63; BYTE $0x91; BYTE $0x22; BYTE $0x2E; BYTE $0x01
+#define VPINSRQ_1_SI_X14_0 BYTE $0xC4; BYTE $0x63; BYTE $0x89; BYTE $0x22; BYTE $0x36; BYTE $0x01
+#define VPINSRQ_1_SI_X15_0 BYTE $0xC4; BYTE $0x63; BYTE $0x81; BYTE $0x22; BYTE $0x3E; BYTE $0x01
+
+#define VPINSRQ_1_SI_X11(n) BYTE $0xC4; BYTE $0x63; BYTE $0xA1; BYTE $0x22; BYTE $0x5E; BYTE $n; BYTE $0x01
+#define VPINSRQ_1_SI_X12(n) BYTE $0xC4; BYTE $0x63; BYTE $0x99; BYTE $0x22; BYTE $0x66; BYTE $n; BYTE $0x01
+#define VPINSRQ_1_SI_X13(n) BYTE $0xC4; BYTE $0x63; BYTE $0x91; BYTE $0x22; BYTE $0x6E; BYTE $n; BYTE $0x01
+#define VPINSRQ_1_SI_X14(n) BYTE $0xC4; BYTE $0x63; BYTE $0x89; BYTE $0x22; BYTE $0x76; BYTE $n; BYTE $0x01
+#define VPINSRQ_1_SI_X15(n) BYTE $0xC4; BYTE $0x63; BYTE $0x81; BYTE $0x22; BYTE $0x7E; BYTE $n; BYTE $0x01
+
+#define VMOVQ_R8_X15 BYTE $0xC4; BYTE $0x41; BYTE $0xF9; BYTE $0x6E; BYTE $0xF8
+#define VPINSRQ_1_R9_X15 BYTE $0xC4; BYTE $0x43; BYTE $0x81; BYTE $0x22; BYTE $0xF9; BYTE $0x01
+
+// load msg: Y12 = (i0, i1, i2, i3)
+// i0, i1, i2, i3 must not be 0
+#define LOAD_MSG_AVX2_Y12(i0, i1, i2, i3) \
+	VMOVQ_SI_X12(i0*8);           \
+	VMOVQ_SI_X11(i2*8);           \
+	VPINSRQ_1_SI_X12(i1*8);       \
+	VPINSRQ_1_SI_X11(i3*8);       \
+	VINSERTI128 $1, X11, Y12, Y12
+
+// load msg: Y13 = (i0, i1, i2, i3)
+// i0, i1, i2, i3 must not be 0
+#define LOAD_MSG_AVX2_Y13(i0, i1, i2, i3) \
+	VMOVQ_SI_X13(i0*8);           \
+	VMOVQ_SI_X11(i2*8);           \
+	VPINSRQ_1_SI_X13(i1*8);       \
+	VPINSRQ_1_SI_X11(i3*8);       \
+	VINSERTI128 $1, X11, Y13, Y13
+
+// load msg: Y14 = (i0, i1, i2, i3)
+// i0, i1, i2, i3 must not be 0
+#define LOAD_MSG_AVX2_Y14(i0, i1, i2, i3) \
+	VMOVQ_SI_X14(i0*8);           \
+	VMOVQ_SI_X11(i2*8);           \
+	VPINSRQ_1_SI_X14(i1*8);       \
+	VPINSRQ_1_SI_X11(i3*8);       \
+	VINSERTI128 $1, X11, Y14, Y14
+
+// load msg: Y15 = (i0, i1, i2, i3)
+// i0, i1, i2, i3 must not be 0
+#define LOAD_MSG_AVX2_Y15(i0, i1, i2, i3) \
+	VMOVQ_SI_X15(i0*8);           \
+	VMOVQ_SI_X11(i2*8);           \
+	VPINSRQ_1_SI_X15(i1*8);       \
+	VPINSRQ_1_SI_X11(i3*8);       \
+	VINSERTI128 $1, X11, Y15, Y15
+
+#define LOAD_MSG_AVX2_0_2_4_6_1_3_5_7_8_10_12_14_9_11_13_15() \
+	VMOVQ_SI_X12_0;                   \
+	VMOVQ_SI_X11(4*8);                \
+	VPINSRQ_1_SI_X12(2*8);            \
+	VPINSRQ_1_SI_X11(6*8);            \
+	VINSERTI128 $1, X11, Y12, Y12;    \
+	LOAD_MSG_AVX2_Y13(1, 3, 5, 7);    \
+	LOAD_MSG_AVX2_Y14(8, 10, 12, 14); \
+	LOAD_MSG_AVX2_Y15(9, 11, 13, 15)
+
+#define LOAD_MSG_AVX2_14_4_9_13_10_8_15_6_1_0_11_5_12_2_7_3() \
+	LOAD_MSG_AVX2_Y12(14, 4, 9, 13); \
+	LOAD_MSG_AVX2_Y13(10, 8, 15, 6); \
+	VMOVQ_SI_X11(11*8);              \
+	VPSHUFD     $0x4E, 0*8(SI), X14; \
+	VPINSRQ_1_SI_X11(5*8);           \
+	VINSERTI128 $1, X11, Y14, Y14;   \
+	LOAD_MSG_AVX2_Y15(12, 2, 7, 3)
+
+#define LOAD_MSG_AVX2_11_12_5_15_8_0_2_13_10_3_7_9_14_6_1_4() \
+	VMOVQ_SI_X11(5*8);              \
+	VMOVDQU     11*8(SI), X12;      \
+	VPINSRQ_1_SI_X11(15*8);         \
+	VINSERTI128 $1, X11, Y12, Y12;  \
+	VMOVQ_SI_X13(8*8);              \
+	VMOVQ_SI_X11(2*8);              \
+	VPINSRQ_1_SI_X13_0;             \
+	VPINSRQ_1_SI_X11(13*8);         \
+	VINSERTI128 $1, X11, Y13, Y13;  \
+	LOAD_MSG_AVX2_Y14(10, 3, 7, 9); \
+	LOAD_MSG_AVX2_Y15(14, 6, 1, 4)
+
+#define LOAD_MSG_AVX2_7_3_13_11_9_1_12_14_2_5_4_15_6_10_0_8() \
+	LOAD_MSG_AVX2_Y12(7, 3, 13, 11); \
+	LOAD_MSG_AVX2_Y13(9, 1, 12, 14); \
+	LOAD_MSG_AVX2_Y14(2, 5, 4, 15);  \
+	VMOVQ_SI_X15(6*8);               \
+	VMOVQ_SI_X11_0;                  \
+	VPINSRQ_1_SI_X15(10*8);          \
+	VPINSRQ_1_SI_X11(8*8);           \
+	VINSERTI128 $1, X11, Y15, Y15
+
+#define LOAD_MSG_AVX2_9_5_2_10_0_7_4_15_14_11_6_3_1_12_8_13() \
+	LOAD_MSG_AVX2_Y12(9, 5, 2, 10);  \
+	VMOVQ_SI_X13_0;                  \
+	VMOVQ_SI_X11(4*8);               \
+	VPINSRQ_1_SI_X13(7*8);           \
+	VPINSRQ_1_SI_X11(15*8);          \
+	VINSERTI128 $1, X11, Y13, Y13;   \
+	LOAD_MSG_AVX2_Y14(14, 11, 6, 3); \
+	LOAD_MSG_AVX2_Y15(1, 12, 8, 13)
+
+#define LOAD_MSG_AVX2_2_6_0_8_12_10_11_3_4_7_15_1_13_5_14_9() \
+	VMOVQ_SI_X12(2*8);                \
+	VMOVQ_SI_X11_0;                   \
+	VPINSRQ_1_SI_X12(6*8);            \
+	VPINSRQ_1_SI_X11(8*8);            \
+	VINSERTI128 $1, X11, Y12, Y12;    \
+	LOAD_MSG_AVX2_Y13(12, 10, 11, 3); \
+	LOAD_MSG_AVX2_Y14(4, 7, 15, 1);   \
+	LOAD_MSG_AVX2_Y15(13, 5, 14, 9)
+
+#define LOAD_MSG_AVX2_12_1_14_4_5_15_13_10_0_6_9_8_7_3_2_11() \
+	LOAD_MSG_AVX2_Y12(12, 1, 14, 4);  \
+	LOAD_MSG_AVX2_Y13(5, 15, 13, 10); \
+	VMOVQ_SI_X14_0;                   \
+	VPSHUFD     $0x4E, 8*8(SI), X11;  \
+	VPINSRQ_1_SI_X14(6*8);            \
+	VINSERTI128 $1, X11, Y14, Y14;    \
+	LOAD_MSG_AVX2_Y15(7, 3, 2, 11)
+
+#define LOAD_MSG_AVX2_13_7_12_3_11_14_1_9_5_15_8_2_0_4_6_10() \
+	LOAD_MSG_AVX2_Y12(13, 7, 12, 3); \
+	LOAD_MSG_AVX2_Y13(11, 14, 1, 9); \
+	LOAD_MSG_AVX2_Y14(5, 15, 8, 2);  \
+	VMOVQ_SI_X15_0;                  \
+	VMOVQ_SI_X11(6*8);               \
+	VPINSRQ_1_SI_X15(4*8);           \
+	VPINSRQ_1_SI_X11(10*8);          \
+	VINSERTI128 $1, X11, Y15, Y15
+
+#define LOAD_MSG_AVX2_6_14_11_0_15_9_3_8_12_13_1_10_2_7_4_5() \
+	VMOVQ_SI_X12(6*8);              \
+	VMOVQ_SI_X11(11*8);             \
+	VPINSRQ_1_SI_X12(14*8);         \
+	VPINSRQ_1_SI_X11_0;             \
+	VINSERTI128 $1, X11, Y12, Y12;  \
+	LOAD_MSG_AVX2_Y13(15, 9, 3, 8); \
+	VMOVQ_SI_X11(1*8);              \
+	VMOVDQU     12*8(SI), X14;      \
+	VPINSRQ_1_SI_X11(10*8);         \
+	VINSERTI128 $1, X11, Y14, Y14;  \
+	VMOVQ_SI_X15(2*8);              \
+	VMOVDQU     4*8(SI), X11;       \
+	VPINSRQ_1_SI_X15(7*8);          \
+	VINSERTI128 $1, X11, Y15, Y15
+
+#define LOAD_MSG_AVX2_10_8_7_1_2_4_6_5_15_9_3_13_11_14_12_0() \
+	LOAD_MSG_AVX2_Y12(10, 8, 7, 1);  \
+	VMOVQ_SI_X13(2*8);               \
+	VPSHUFD     $0x4E, 5*8(SI), X11; \
+	VPINSRQ_1_SI_X13(4*8);           \
+	VINSERTI128 $1, X11, Y13, Y13;   \
+	LOAD_MSG_AVX2_Y14(15, 9, 3, 13); \
+	VMOVQ_SI_X15(11*8);              \
+	VMOVQ_SI_X11(12*8);              \
+	VPINSRQ_1_SI_X15(14*8);          \
+	VPINSRQ_1_SI_X11_0;              \
+	VINSERTI128 $1, X11, Y15, Y15
+
+// func fAVX2(h *[8]uint64, m *[16]uint64, c0, c1 uint64, flag uint64, rounds uint64)
+TEXT ·fAVX2(SB), 4, $64-48 // frame size = 32 + 32 byte alignment
+	MOVQ h+0(FP), AX
+	MOVQ m+8(FP), SI
+	MOVQ c0+16(FP), R8
+	MOVQ c1+24(FP), R9
+	MOVQ flag+32(FP), CX
+	MOVQ rounds+40(FP), BX
+
+	MOVQ SP, DX
+	MOVQ SP, R10
+	ADDQ $31, R10
+	ANDQ $~31, R10
+	MOVQ R10, SP
+
+	MOVQ CX, 16(SP)
+	XORQ CX, CX
+	MOVQ CX, 24(SP)
+
+	VMOVDQU ·AVX2_c40<>(SB), Y4
+	VMOVDQU ·AVX2_c48<>(SB), Y5
+
+	VMOVDQU 0(AX), Y8
+	VMOVDQU 32(AX), Y9
+	VMOVDQU ·AVX2_iv0<>(SB), Y6
+	VMOVDQU ·AVX2_iv1<>(SB), Y7
+
+	MOVQ R8, 0(SP)
+	MOVQ R9, 8(SP)
+	
+	VMOVDQA Y8, Y0
+	VMOVDQA Y9, Y1
+	VMOVDQA Y6, Y2
+	VPXOR   0(SP), Y7, Y3
+
+loop:
+	SUBQ $1, BX; JCS done
+	LOAD_MSG_AVX2_0_2_4_6_1_3_5_7_8_10_12_14_9_11_13_15()
+	ROUND_AVX2(Y12, Y13, Y14, Y15, Y10, Y4, Y5)
+
+	SUBQ $1, BX; JCS done
+	LOAD_MSG_AVX2_14_4_9_13_10_8_15_6_1_0_11_5_12_2_7_3()
+	ROUND_AVX2(Y12, Y13, Y14, Y15, Y10, Y4, Y5)
+
+	SUBQ $1, BX; JCS done
+	LOAD_MSG_AVX2_11_12_5_15_8_0_2_13_10_3_7_9_14_6_1_4()
+	ROUND_AVX2(Y12, Y13, Y14, Y15, Y10, Y4, Y5)
+
+	SUBQ $1, BX; JCS done
+	LOAD_MSG_AVX2_7_3_13_11_9_1_12_14_2_5_4_15_6_10_0_8()
+	ROUND_AVX2(Y12, Y13, Y14, Y15, Y10, Y4, Y5)
+
+	SUBQ $1, BX; JCS done
+	LOAD_MSG_AVX2_9_5_2_10_0_7_4_15_14_11_6_3_1_12_8_13()
+	ROUND_AVX2(Y12, Y13, Y14, Y15, Y10, Y4, Y5)
+
+	SUBQ $1, BX; JCS done
+	LOAD_MSG_AVX2_2_6_0_8_12_10_11_3_4_7_15_1_13_5_14_9()
+	ROUND_AVX2(Y12, Y13, Y14, Y15, Y10, Y4, Y5)
+
+	SUBQ $1, BX; JCS done
+	LOAD_MSG_AVX2_12_1_14_4_5_15_13_10_0_6_9_8_7_3_2_11()
+	ROUND_AVX2(Y12, Y13, Y14, Y15, Y10, Y4, Y5)
+
+	SUBQ $1, BX; JCS done
+	LOAD_MSG_AVX2_13_7_12_3_11_14_1_9_5_15_8_2_0_4_6_10()
+	ROUND_AVX2(Y12, Y13, Y14, Y15, Y10, Y4, Y5)
+
+	SUBQ $1, BX; JCS done
+	LOAD_MSG_AVX2_6_14_11_0_15_9_3_8_12_13_1_10_2_7_4_5()
+	ROUND_AVX2(Y12, Y13, Y14, Y15, Y10, Y4, Y5)
+
+	SUBQ $1, BX; JCS done
+	LOAD_MSG_AVX2_10_8_7_1_2_4_6_5_15_9_3_13_11_14_12_0()
+	ROUND_AVX2(Y12, Y13, Y14, Y15, Y10, Y4, Y5)
+
+	JMP loop
+
+done:
+	VPXOR Y0, Y8, Y8
+	VPXOR Y1, Y9, Y9
+	VPXOR Y2, Y8, Y8
+	VPXOR Y3, Y9, Y9
+
+	VMOVDQU Y8, 0(AX)
+	VMOVDQU Y9, 32(AX)
+	VZEROUPPER
+
+	MOVQ DX, SP
+	RET
+
+#define VPUNPCKLQDQ_X2_X2_X15 BYTE $0xC5; BYTE $0x69; BYTE $0x6C; BYTE $0xFA
+#define VPUNPCKLQDQ_X3_X3_X15 BYTE $0xC5; BYTE $0x61; BYTE $0x6C; BYTE $0xFB
+#define VPUNPCKLQDQ_X7_X7_X15 BYTE $0xC5; BYTE $0x41; BYTE $0x6C; BYTE $0xFF
+#define VPUNPCKLQDQ_X13_X13_X15 BYTE $0xC4; BYTE $0x41; BYTE $0x11; BYTE $0x6C; BYTE $0xFD
+#define VPUNPCKLQDQ_X14_X14_X15 BYTE $0xC4; BYTE $0x41; BYTE $0x09; BYTE $0x6C; BYTE $0xFE
+
+#define VPUNPCKHQDQ_X15_X2_X2 BYTE $0xC4; BYTE $0xC1; BYTE $0x69; BYTE $0x6D; BYTE $0xD7
+#define VPUNPCKHQDQ_X15_X3_X3 BYTE $0xC4; BYTE $0xC1; BYTE $0x61; BYTE $0x6D; BYTE $0xDF
+#define VPUNPCKHQDQ_X15_X6_X6 BYTE $0xC4; BYTE $0xC1; BYTE $0x49; BYTE $0x6D; BYTE $0xF7
+#define VPUNPCKHQDQ_X15_X7_X7 BYTE $0xC4; BYTE $0xC1; BYTE $0x41; BYTE $0x6D; BYTE $0xFF
+#define VPUNPCKHQDQ_X15_X3_X2 BYTE $0xC4; BYTE $0xC1; BYTE $0x61; BYTE $0x6D; BYTE $0xD7
+#define VPUNPCKHQDQ_X15_X7_X6 BYTE $0xC4; BYTE $0xC1; BYTE $0x41; BYTE $0x6D; BYTE $0xF7
+#define VPUNPCKHQDQ_X15_X13_X3 BYTE $0xC4; BYTE $0xC1; BYTE $0x11; BYTE $0x6D; BYTE $0xDF
+#define VPUNPCKHQDQ_X15_X13_X7 BYTE $0xC4; BYTE $0xC1; BYTE $0x11; BYTE $0x6D; BYTE $0xFF
+
+#define SHUFFLE_AVX() \
+	VMOVDQA X6, X13;         \
+	VMOVDQA X2, X14;         \
+	VMOVDQA X4, X6;          \
+	VPUNPCKLQDQ_X13_X13_X15; \
+	VMOVDQA X5, X4;          \
+	VMOVDQA X6, X5;          \
+	VPUNPCKHQDQ_X15_X7_X6;   \
+	VPUNPCKLQDQ_X7_X7_X15;   \
+	VPUNPCKHQDQ_X15_X13_X7;  \
+	VPUNPCKLQDQ_X3_X3_X15;   \
+	VPUNPCKHQDQ_X15_X2_X2;   \
+	VPUNPCKLQDQ_X14_X14_X15; \
+	VPUNPCKHQDQ_X15_X3_X3;   \
+
+#define SHUFFLE_AVX_INV() \
+	VMOVDQA X2, X13;         \
+	VMOVDQA X4, X14;         \
+	VPUNPCKLQDQ_X2_X2_X15;   \
+	VMOVDQA X5, X4;          \
+	VPUNPCKHQDQ_X15_X3_X2;   \
+	VMOVDQA X14, X5;         \
+	VPUNPCKLQDQ_X3_X3_X15;   \
+	VMOVDQA X6, X14;         \
+	VPUNPCKHQDQ_X15_X13_X3;  \
+	VPUNPCKLQDQ_X7_X7_X15;   \
+	VPUNPCKHQDQ_X15_X6_X6;   \
+	VPUNPCKLQDQ_X14_X14_X15; \
+	VPUNPCKHQDQ_X15_X7_X7;   \
+
+#define HALF_ROUND_AVX(v0, v1, v2, v3, v4, v5, v6, v7, m0, m1, m2, m3, t0, c40, c48) \
+	VPADDQ  m0, v0, v0;   \
+	VPADDQ  v2, v0, v0;   \
+	VPADDQ  m1, v1, v1;   \
+	VPADDQ  v3, v1, v1;   \
+	VPXOR   v0, v6, v6;   \
+	VPXOR   v1, v7, v7;   \
+	VPSHUFD $-79, v6, v6; \
+	VPSHUFD $-79, v7, v7; \
+	VPADDQ  v6, v4, v4;   \
+	VPADDQ  v7, v5, v5;   \
+	VPXOR   v4, v2, v2;   \
+	VPXOR   v5, v3, v3;   \
+	VPSHUFB c40, v2, v2;  \
+	VPSHUFB c40, v3, v3;  \
+	VPADDQ  m2, v0, v0;   \
+	VPADDQ  v2, v0, v0;   \
+	VPADDQ  m3, v1, v1;   \
+	VPADDQ  v3, v1, v1;   \
+	VPXOR   v0, v6, v6;   \
+	VPXOR   v1, v7, v7;   \
+	VPSHUFB c48, v6, v6;  \
+	VPSHUFB c48, v7, v7;  \
+	VPADDQ  v6, v4, v4;   \
+	VPADDQ  v7, v5, v5;   \
+	VPXOR   v4, v2, v2;   \
+	VPXOR   v5, v3, v3;   \
+	VPADDQ  v2, v2, t0;   \
+	VPSRLQ  $63, v2, v2;  \
+	VPXOR   t0, v2, v2;   \
+	VPADDQ  v3, v3, t0;   \
+	VPSRLQ  $63, v3, v3;  \
+	VPXOR   t0, v3, v3
+
+// load msg: X12 = (i0, i1), X13 = (i2, i3), X14 = (i4, i5), X15 = (i6, i7)
+// i0, i1, i2, i3, i4, i5, i6, i7 must not be 0
+#define LOAD_MSG_AVX(i0, i1, i2, i3, i4, i5, i6, i7) \
+	VMOVQ_SI_X12(i0*8);     \
+	VMOVQ_SI_X13(i2*8);     \
+	VMOVQ_SI_X14(i4*8);     \
+	VMOVQ_SI_X15(i6*8);     \
+	VPINSRQ_1_SI_X12(i1*8); \
+	VPINSRQ_1_SI_X13(i3*8); \
+	VPINSRQ_1_SI_X14(i5*8); \
+	VPINSRQ_1_SI_X15(i7*8)
+
+// load msg: X12 = (0, 2), X13 = (4, 6), X14 = (1, 3), X15 = (5, 7)
+#define LOAD_MSG_AVX_0_2_4_6_1_3_5_7() \
+	VMOVQ_SI_X12_0;        \
+	VMOVQ_SI_X13(4*8);     \
+	VMOVQ_SI_X14(1*8);     \
+	VMOVQ_SI_X15(5*8);     \
+	VPINSRQ_1_SI_X12(2*8); \
+	VPINSRQ_1_SI_X13(6*8); \
+	VPINSRQ_1_SI_X14(3*8); \
+	VPINSRQ_1_SI_X15(7*8)
+
+// load msg: X12 = (1, 0), X13 = (11, 5), X14 = (12, 2), X15 = (7, 3)
+#define LOAD_MSG_AVX_1_0_11_5_12_2_7_3() \
+	VPSHUFD $0x4E, 0*8(SI), X12; \
+	VMOVQ_SI_X13(11*8);          \
+	VMOVQ_SI_X14(12*8);          \
+	VMOVQ_SI_X15(7*8);           \
+	VPINSRQ_1_SI_X13(5*8);       \
+	VPINSRQ_1_SI_X14(2*8);       \
+	VPINSRQ_1_SI_X15(3*8)
+
+// load msg: X12 = (11, 12), X13 = (5, 15), X14 = (8, 0), X15 = (2, 13)
+#define LOAD_MSG_AVX_11_12_5_15_8_0_2_13() \
+	VMOVDQU 11*8(SI), X12;  \
+	VMOVQ_SI_X13(5*8);      \
+	VMOVQ_SI_X14(8*8);      \
+	VMOVQ_SI_X15(2*8);      \
+	VPINSRQ_1_SI_X13(15*8); \
+	VPINSRQ_1_SI_X14_0;     \
+	VPINSRQ_1_SI_X15(13*8)
+
+// load msg: X12 = (2, 5), X13 = (4, 15), X14 = (6, 10), X15 = (0, 8)
+#define LOAD_MSG_AVX_2_5_4_15_6_10_0_8() \
+	VMOVQ_SI_X12(2*8);      \
+	VMOVQ_SI_X13(4*8);      \
+	VMOVQ_SI_X14(6*8);      \
+	VMOVQ_SI_X15_0;         \
+	VPINSRQ_1_SI_X12(5*8);  \
+	VPINSRQ_1_SI_X13(15*8); \
+	VPINSRQ_1_SI_X14(10*8); \
+	VPINSRQ_1_SI_X15(8*8)
+
+// load msg: X12 = (9, 5), X13 = (2, 10), X14 = (0, 7), X15 = (4, 15)
+#define LOAD_MSG_AVX_9_5_2_10_0_7_4_15() \
+	VMOVQ_SI_X12(9*8);      \
+	VMOVQ_SI_X13(2*8);      \
+	VMOVQ_SI_X14_0;         \
+	VMOVQ_SI_X15(4*8);      \
+	VPINSRQ_1_SI_X12(5*8);  \
+	VPINSRQ_1_SI_X13(10*8); \
+	VPINSRQ_1_SI_X14(7*8);  \
+	VPINSRQ_1_SI_X15(15*8)
+
+// load msg: X12 = (2, 6), X13 = (0, 8), X14 = (12, 10), X15 = (11, 3)
+#define LOAD_MSG_AVX_2_6_0_8_12_10_11_3() \
+	VMOVQ_SI_X12(2*8);      \
+	VMOVQ_SI_X13_0;         \
+	VMOVQ_SI_X14(12*8);     \
+	VMOVQ_SI_X15(11*8);     \
+	VPINSRQ_1_SI_X12(6*8);  \
+	VPINSRQ_1_SI_X13(8*8);  \
+	VPINSRQ_1_SI_X14(10*8); \
+	VPINSRQ_1_SI_X15(3*8)
+
+// load msg: X12 = (0, 6), X13 = (9, 8), X14 = (7, 3), X15 = (2, 11)
+#define LOAD_MSG_AVX_0_6_9_8_7_3_2_11() \
+	MOVQ    0*8(SI), X12;        \
+	VPSHUFD $0x4E, 8*8(SI), X13; \
+	MOVQ    7*8(SI), X14;        \
+	MOVQ    2*8(SI), X15;        \
+	VPINSRQ_1_SI_X12(6*8);       \
+	VPINSRQ_1_SI_X14(3*8);       \
+	VPINSRQ_1_SI_X15(11*8)
+
+// load msg: X12 = (6, 14), X13 = (11, 0), X14 = (15, 9), X15 = (3, 8)
+#define LOAD_MSG_AVX_6_14_11_0_15_9_3_8() \
+	MOVQ 6*8(SI), X12;      \
+	MOVQ 11*8(SI), X13;     \
+	MOVQ 15*8(SI), X14;     \
+	MOVQ 3*8(SI), X15;      \
+	VPINSRQ_1_SI_X12(14*8); \
+	VPINSRQ_1_SI_X13_0;     \
+	VPINSRQ_1_SI_X14(9*8);  \
+	VPINSRQ_1_SI_X15(8*8)
+
+// load msg: X12 = (5, 15), X13 = (8, 2), X14 = (0, 4), X15 = (6, 10)
+#define LOAD_MSG_AVX_5_15_8_2_0_4_6_10() \
+	MOVQ 5*8(SI), X12;      \
+	MOVQ 8*8(SI), X13;      \
+	MOVQ 0*8(SI), X14;      \
+	MOVQ 6*8(SI), X15;      \
+	VPINSRQ_1_SI_X12(15*8); \
+	VPINSRQ_1_SI_X13(2*8);  \
+	VPINSRQ_1_SI_X14(4*8);  \
+	VPINSRQ_1_SI_X15(10*8)
+
+// load msg: X12 = (12, 13), X13 = (1, 10), X14 = (2, 7), X15 = (4, 5)
+#define LOAD_MSG_AVX_12_13_1_10_2_7_4_5() \
+	VMOVDQU 12*8(SI), X12;  \
+	MOVQ    1*8(SI), X13;   \
+	MOVQ    2*8(SI), X14;   \
+	VPINSRQ_1_SI_X13(10*8); \
+	VPINSRQ_1_SI_X14(7*8);  \
+	VMOVDQU 4*8(SI), X15
+
+// load msg: X12 = (15, 9), X13 = (3, 13), X14 = (11, 14), X15 = (12, 0)
+#define LOAD_MSG_AVX_15_9_3_13_11_14_12_0() \
+	MOVQ 15*8(SI), X12;     \
+	MOVQ 3*8(SI), X13;      \
+	MOVQ 11*8(SI), X14;     \
+	MOVQ 12*8(SI), X15;     \
+	VPINSRQ_1_SI_X12(9*8);  \
+	VPINSRQ_1_SI_X13(13*8); \
+	VPINSRQ_1_SI_X14(14*8); \
+	VPINSRQ_1_SI_X15_0
+
+// func fAVX(h *[8]uint64, m *[16]uint64, c0, c1 uint64, flag uint64, rounds uint64)
+TEXT ·fAVX(SB), 4, $24-48 // frame size = 8 + 16 byte alignment
+	MOVQ h+0(FP), AX
+	MOVQ m+8(FP), SI
+	MOVQ c0+16(FP), R8
+	MOVQ c1+24(FP), R9
+	MOVQ flag+32(FP), CX
+	MOVQ rounds+40(FP), BX
+
+	MOVQ SP, BP
+	MOVQ SP, R10
+	ADDQ $15, R10
+	ANDQ $~15, R10
+	MOVQ R10, SP
+
+	VMOVDQU ·AVX_c40<>(SB), X0
+	VMOVDQU ·AVX_c48<>(SB), X1
+	VMOVDQA X0, X8
+	VMOVDQA X1, X9
+
+	VMOVDQU ·AVX_iv3<>(SB), X0
+	VMOVDQA X0, 0(SP)
+	XORQ    CX, 0(SP)          // 0(SP) = ·AVX_iv3 ^ (CX || 0)
+
+	VMOVDQU 0(AX), X10
+	VMOVDQU 16(AX), X11
+	VMOVDQU 32(AX), X2
+	VMOVDQU 48(AX), X3
+
+	VMOVQ_R8_X15
+	VPINSRQ_1_R9_X15
+
+	VMOVDQA X10, X0
+	VMOVDQA X11, X1
+	VMOVDQU ·AVX_iv0<>(SB), X4
+	VMOVDQU ·AVX_iv1<>(SB), X5
+	VMOVDQU ·AVX_iv2<>(SB), X6
+
+	VPXOR   X15, X6, X6
+	VMOVDQA 0(SP), X7
+
+loop:
+	SUBQ $1, BX; JCS done
+	LOAD_MSG_AVX_0_2_4_6_1_3_5_7()
+	HALF_ROUND_AVX(X0, X1, X2, X3, X4, X5, X6, X7, X12, X13, X14, X15, X15, X8, X9)
+	SHUFFLE_AVX()
+	LOAD_MSG_AVX(8, 10, 12, 14, 9, 11, 13, 15)
+	HALF_ROUND_AVX(X0, X1, X2, X3, X4, X5, X6, X7, X12, X13, X14, X15, X15, X8, X9)
+	SHUFFLE_AVX_INV()
+
+	SUBQ $1, BX; JCS done
+	LOAD_MSG_AVX(14, 4, 9, 13, 10, 8, 15, 6)
+	HALF_ROUND_AVX(X0, X1, X2, X3, X4, X5, X6, X7, X12, X13, X14, X15, X15, X8, X9)
+	SHUFFLE_AVX()
+	LOAD_MSG_AVX_1_0_11_5_12_2_7_3()
+	HALF_ROUND_AVX(X0, X1, X2, X3, X4, X5, X6, X7, X12, X13, X14, X15, X15, X8, X9)
+	SHUFFLE_AVX_INV()
+
+	SUBQ $1, BX; JCS done
+	LOAD_MSG_AVX_11_12_5_15_8_0_2_13()
+	HALF_ROUND_AVX(X0, X1, X2, X3, X4, X5, X6, X7, X12, X13, X14, X15, X15, X8, X9)
+	SHUFFLE_AVX()
+	LOAD_MSG_AVX(10, 3, 7, 9, 14, 6, 1, 4)
+	HALF_ROUND_AVX(X0, X1, X2, X3, X4, X5, X6, X7, X12, X13, X14, X15, X15, X8, X9)
+	SHUFFLE_AVX_INV()
+
+	SUBQ $1, BX; JCS done
+	LOAD_MSG_AVX(7, 3, 13, 11, 9, 1, 12, 14)
+	HALF_ROUND_AVX(X0, X1, X2, X3, X4, X5, X6, X7, X12, X13, X14, X15, X15, X8, X9)
+	SHUFFLE_AVX()
+	LOAD_MSG_AVX_2_5_4_15_6_10_0_8()
+	HALF_ROUND_AVX(X0, X1, X2, X3, X4, X5, X6, X7, X12, X13, X14, X15, X15, X8, X9)
+	SHUFFLE_AVX_INV()
+
+	SUBQ $1, BX; JCS done
+	LOAD_MSG_AVX_9_5_2_10_0_7_4_15()
+	HALF_ROUND_AVX(X0, X1, X2, X3, X4, X5, X6, X7, X12, X13, X14, X15, X15, X8, X9)
+	SHUFFLE_AVX()
+	LOAD_MSG_AVX(14, 11, 6, 3, 1, 12, 8, 13)
+	HALF_ROUND_AVX(X0, X1, X2, X3, X4, X5, X6, X7, X12, X13, X14, X15, X15, X8, X9)
+	SHUFFLE_AVX_INV()
+
+	SUBQ $1, BX; JCS done
+	LOAD_MSG_AVX_2_6_0_8_12_10_11_3()
+	HALF_ROUND_AVX(X0, X1, X2, X3, X4, X5, X6, X7, X12, X13, X14, X15, X15, X8, X9)
+	SHUFFLE_AVX()
+	LOAD_MSG_AVX(4, 7, 15, 1, 13, 5, 14, 9)
+	HALF_ROUND_AVX(X0, X1, X2, X3, X4, X5, X6, X7, X12, X13, X14, X15, X15, X8, X9)
+	SHUFFLE_AVX_INV()
+
+	SUBQ $1, BX; JCS done
+	LOAD_MSG_AVX(12, 1, 14, 4, 5, 15, 13, 10)
+	HALF_ROUND_AVX(X0, X1, X2, X3, X4, X5, X6, X7, X12, X13, X14, X15, X15, X8, X9)
+	SHUFFLE_AVX()
+	LOAD_MSG_AVX_0_6_9_8_7_3_2_11()
+	HALF_ROUND_AVX(X0, X1, X2, X3, X4, X5, X6, X7, X12, X13, X14, X15, X15, X8, X9)
+	SHUFFLE_AVX_INV()
+
+	SUBQ $1, BX; JCS done
+	LOAD_MSG_AVX(13, 7, 12, 3, 11, 14, 1, 9)
+	HALF_ROUND_AVX(X0, X1, X2, X3, X4, X5, X6, X7, X12, X13, X14, X15, X15, X8, X9)
+	SHUFFLE_AVX()
+	LOAD_MSG_AVX_5_15_8_2_0_4_6_10()
+	HALF_ROUND_AVX(X0, X1, X2, X3, X4, X5, X6, X7, X12, X13, X14, X15, X15, X8, X9)
+	SHUFFLE_AVX_INV()
+
+	SUBQ $1, BX; JCS done
+	LOAD_MSG_AVX_6_14_11_0_15_9_3_8()
+	HALF_ROUND_AVX(X0, X1, X2, X3, X4, X5, X6, X7, X12, X13, X14, X15, X15, X8, X9)
+	SHUFFLE_AVX()
+	LOAD_MSG_AVX_12_13_1_10_2_7_4_5()
+	HALF_ROUND_AVX(X0, X1, X2, X3, X4, X5, X6, X7, X12, X13, X14, X15, X15, X8, X9)
+	SHUFFLE_AVX_INV()
+
+	SUBQ $1, BX; JCS done
+	LOAD_MSG_AVX(10, 8, 7, 1, 2, 4, 6, 5)
+	HALF_ROUND_AVX(X0, X1, X2, X3, X4, X5, X6, X7, X12, X13, X14, X15, X15, X8, X9)
+	SHUFFLE_AVX()
+	LOAD_MSG_AVX_15_9_3_13_11_14_12_0()
+	HALF_ROUND_AVX(X0, X1, X2, X3, X4, X5, X6, X7, X12, X13, X14, X15, X15, X8, X9)
+	SHUFFLE_AVX_INV()
+
+	JMP loop
+
+done:
+	VMOVDQU 32(AX), X14
+	VMOVDQU 48(AX), X15
+	VPXOR   X0, X10, X10
+	VPXOR   X1, X11, X11
+	VPXOR   X2, X14, X14
+	VPXOR   X3, X15, X15
+	VPXOR   X4, X10, X10
+	VPXOR   X5, X11, X11
+	VPXOR   X6, X14, X2
+	VPXOR   X7, X15, X3
+	VMOVDQU X2, 32(AX)
+	VMOVDQU X3, 48(AX)
+
+	VMOVDQU X10, 0(AX)
+	VMOVDQU X11, 16(AX)
+	VZEROUPPER
+
+	MOVQ BP, SP
+	RET
diff --git a/crypto/blake2b/blake2b_amd64.go b/crypto/blake2b/blake2b_amd64.go
new file mode 100644
index 000000000..4dbe90da8
--- /dev/null
+++ b/crypto/blake2b/blake2b_amd64.go
@@ -0,0 +1,24 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !go1.7,amd64,!gccgo,!appengine
+
+package blake2b
+
+import "golang.org/x/sys/cpu"
+
+func init() {
+	useSSE4 = cpu.X86.HasSSE41
+}
+
+//go:noescape
+func fSSE4(h *[8]uint64, m *[16]uint64, c0, c1 uint64, flag uint64, rounds uint64)
+
+func f(h *[8]uint64, m *[16]uint64, c0, c1 uint64, flag uint64, rounds uint64) {
+	if useSSE4 {
+		fSSE4(h, m, c0, c1, flag, rounds)
+	} else {
+		fGeneric(h, m, c0, c1, flag, rounds)
+	}
+}
diff --git a/crypto/blake2b/blake2b_amd64.s b/crypto/blake2b/blake2b_amd64.s
new file mode 100644
index 000000000..ce4b56d10
--- /dev/null
+++ b/crypto/blake2b/blake2b_amd64.s
@@ -0,0 +1,253 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build amd64,!gccgo,!appengine
+
+#include "textflag.h"
+
+DATA ·iv0<>+0x00(SB)/8, $0x6a09e667f3bcc908
+DATA ·iv0<>+0x08(SB)/8, $0xbb67ae8584caa73b
+GLOBL ·iv0<>(SB), (NOPTR+RODATA), $16
+
+DATA ·iv1<>+0x00(SB)/8, $0x3c6ef372fe94f82b
+DATA ·iv1<>+0x08(SB)/8, $0xa54ff53a5f1d36f1
+GLOBL ·iv1<>(SB), (NOPTR+RODATA), $16
+
+DATA ·iv2<>+0x00(SB)/8, $0x510e527fade682d1
+DATA ·iv2<>+0x08(SB)/8, $0x9b05688c2b3e6c1f
+GLOBL ·iv2<>(SB), (NOPTR+RODATA), $16
+
+DATA ·iv3<>+0x00(SB)/8, $0x1f83d9abfb41bd6b
+DATA ·iv3<>+0x08(SB)/8, $0x5be0cd19137e2179
+GLOBL ·iv3<>(SB), (NOPTR+RODATA), $16
+
+DATA ·c40<>+0x00(SB)/8, $0x0201000706050403
+DATA ·c40<>+0x08(SB)/8, $0x0a09080f0e0d0c0b
+GLOBL ·c40<>(SB), (NOPTR+RODATA), $16
+
+DATA ·c48<>+0x00(SB)/8, $0x0100070605040302
+DATA ·c48<>+0x08(SB)/8, $0x09080f0e0d0c0b0a
+GLOBL ·c48<>(SB), (NOPTR+RODATA), $16
+
+#define SHUFFLE(v2, v3, v4, v5, v6, v7, t1, t2) \
+	MOVO       v4, t1; \
+	MOVO       v5, v4; \
+	MOVO       t1, v5; \
+	MOVO       v6, t1; \
+	PUNPCKLQDQ v6, t2; \
+	PUNPCKHQDQ v7, v6; \
+	PUNPCKHQDQ t2, v6; \
+	PUNPCKLQDQ v7, t2; \
+	MOVO       t1, v7; \
+	MOVO       v2, t1; \
+	PUNPCKHQDQ t2, v7; \
+	PUNPCKLQDQ v3, t2; \
+	PUNPCKHQDQ t2, v2; \
+	PUNPCKLQDQ t1, t2; \
+	PUNPCKHQDQ t2, v3
+
+#define SHUFFLE_INV(v2, v3, v4, v5, v6, v7, t1, t2) \
+	MOVO       v4, t1; \
+	MOVO       v5, v4; \
+	MOVO       t1, v5; \
+	MOVO       v2, t1; \
+	PUNPCKLQDQ v2, t2; \
+	PUNPCKHQDQ v3, v2; \
+	PUNPCKHQDQ t2, v2; \
+	PUNPCKLQDQ v3, t2; \
+	MOVO       t1, v3; \
+	MOVO       v6, t1; \
+	PUNPCKHQDQ t2, v3; \
+	PUNPCKLQDQ v7, t2; \
+	PUNPCKHQDQ t2, v6; \
+	PUNPCKLQDQ t1, t2; \
+	PUNPCKHQDQ t2, v7
+
+#define HALF_ROUND(v0, v1, v2, v3, v4, v5, v6, v7, m0, m1, m2, m3, t0, c40, c48) \
+	PADDQ  m0, v0;        \
+	PADDQ  m1, v1;        \
+	PADDQ  v2, v0;        \
+	PADDQ  v3, v1;        \
+	PXOR   v0, v6;        \
+	PXOR   v1, v7;        \
+	PSHUFD $0xB1, v6, v6; \
+	PSHUFD $0xB1, v7, v7; \
+	PADDQ  v6, v4;        \
+	PADDQ  v7, v5;        \
+	PXOR   v4, v2;        \
+	PXOR   v5, v3;        \
+	PSHUFB c40, v2;       \
+	PSHUFB c40, v3;       \
+	PADDQ  m2, v0;        \
+	PADDQ  m3, v1;        \
+	PADDQ  v2, v0;        \
+	PADDQ  v3, v1;        \
+	PXOR   v0, v6;        \
+	PXOR   v1, v7;        \
+	PSHUFB c48, v6;       \
+	PSHUFB c48, v7;       \
+	PADDQ  v6, v4;        \
+	PADDQ  v7, v5;        \
+	PXOR   v4, v2;        \
+	PXOR   v5, v3;        \
+	MOVOU  v2, t0;        \
+	PADDQ  v2, t0;        \
+	PSRLQ  $63, v2;       \
+	PXOR   t0, v2;        \
+	MOVOU  v3, t0;        \
+	PADDQ  v3, t0;        \
+	PSRLQ  $63, v3;       \
+	PXOR   t0, v3
+
+#define LOAD_MSG(m0, m1, m2, m3, i0, i1, i2, i3, i4, i5, i6, i7) \
+	MOVQ   i0*8(SI), m0;     \
+	PINSRQ $1, i1*8(SI), m0; \
+	MOVQ   i2*8(SI), m1;     \
+	PINSRQ $1, i3*8(SI), m1; \
+	MOVQ   i4*8(SI), m2;     \
+	PINSRQ $1, i5*8(SI), m2; \
+	MOVQ   i6*8(SI), m3;     \
+	PINSRQ $1, i7*8(SI), m3
+
+// func fSSE4(h *[8]uint64, m *[16]uint64, c0, c1 uint64, flag uint64, rounds uint64)
+TEXT ·fSSE4(SB), 4, $24-48 // frame size = 8 + 16 byte alignment
+	MOVQ h+0(FP), AX
+	MOVQ m+8(FP), SI
+	MOVQ c0+16(FP), R8
+	MOVQ c1+24(FP), R9
+	MOVQ flag+32(FP), CX
+	MOVQ rounds+40(FP), BX
+
+	MOVQ SP, BP
+	MOVQ SP, R10
+	ADDQ $15, R10
+	ANDQ $~15, R10
+	MOVQ R10, SP
+
+	MOVOU ·iv3<>(SB), X0
+	MOVO  X0, 0(SP)
+	XORQ  CX, 0(SP)     // 0(SP) = ·iv3 ^ (CX || 0)
+
+	MOVOU ·c40<>(SB), X13
+	MOVOU ·c48<>(SB), X14
+
+	MOVOU 0(AX), X12
+	MOVOU 16(AX), X15
+
+	MOVQ R8, X8
+	PINSRQ $1, R9, X8
+
+	MOVO X12, X0
+	MOVO X15, X1
+	MOVOU 32(AX), X2
+	MOVOU 48(AX), X3
+	MOVOU ·iv0<>(SB), X4
+	MOVOU ·iv1<>(SB), X5
+	MOVOU ·iv2<>(SB), X6
+
+	PXOR X8, X6
+	MOVO 0(SP), X7
+
+loop:
+	SUBQ $1, BX; JCS done
+	LOAD_MSG(X8, X9, X10, X11, 0, 2, 4, 6, 1, 3, 5, 7)
+	HALF_ROUND(X0, X1, X2, X3, X4, X5, X6, X7, X8, X9, X10, X11, X11, X13, X14)
+	SHUFFLE(X2, X3, X4, X5, X6, X7, X8, X9)
+	LOAD_MSG(X8, X9, X10, X11, 8, 10, 12, 14, 9, 11, 13, 15)
+	HALF_ROUND(X0, X1, X2, X3, X4, X5, X6, X7, X8, X9, X10, X11, X11, X13, X14)
+	SHUFFLE_INV(X2, X3, X4, X5, X6, X7, X8, X9)
+
+	SUBQ $1, BX; JCS done
+	LOAD_MSG(X8, X9, X10, X11, 14, 4, 9, 13, 10, 8, 15, 6)
+	HALF_ROUND(X0, X1, X2, X3, X4, X5, X6, X7, X8, X9, X10, X11, X11, X13, X14)
+	SHUFFLE(X2, X3, X4, X5, X6, X7, X8, X9)
+	LOAD_MSG(X8, X9, X10, X11, 1, 0, 11, 5, 12, 2, 7, 3)
+	HALF_ROUND(X0, X1, X2, X3, X4, X5, X6, X7, X8, X9, X10, X11, X11, X13, X14)
+	SHUFFLE_INV(X2, X3, X4, X5, X6, X7, X8, X9)
+
+	SUBQ $1, BX; JCS done
+	LOAD_MSG(X8, X9, X10, X11, 11, 12, 5, 15, 8, 0, 2, 13)
+	HALF_ROUND(X0, X1, X2, X3, X4, X5, X6, X7, X8, X9, X10, X11, X11, X13, X14)
+	SHUFFLE(X2, X3, X4, X5, X6, X7, X8, X9)
+	LOAD_MSG(X8, X9, X10, X11, 10, 3, 7, 9, 14, 6, 1, 4)
+	HALF_ROUND(X0, X1, X2, X3, X4, X5, X6, X7, X8, X9, X10, X11, X11, X13, X14)
+	SHUFFLE_INV(X2, X3, X4, X5, X6, X7, X8, X9)
+
+	SUBQ $1, BX; JCS done
+	LOAD_MSG(X8, X9, X10, X11, 7, 3, 13, 11, 9, 1, 12, 14)
+	HALF_ROUND(X0, X1, X2, X3, X4, X5, X6, X7, X8, X9, X10, X11, X11, X13, X14)
+	SHUFFLE(X2, X3, X4, X5, X6, X7, X8, X9)
+	LOAD_MSG(X8, X9, X10, X11, 2, 5, 4, 15, 6, 10, 0, 8)
+	HALF_ROUND(X0, X1, X2, X3, X4, X5, X6, X7, X8, X9, X10, X11, X11, X13, X14)
+	SHUFFLE_INV(X2, X3, X4, X5, X6, X7, X8, X9)
+
+	SUBQ $1, BX; JCS done
+	LOAD_MSG(X8, X9, X10, X11, 9, 5, 2, 10, 0, 7, 4, 15)
+	HALF_ROUND(X0, X1, X2, X3, X4, X5, X6, X7, X8, X9, X10, X11, X11, X13, X14)
+	SHUFFLE(X2, X3, X4, X5, X6, X7, X8, X9)
+	LOAD_MSG(X8, X9, X10, X11, 14, 11, 6, 3, 1, 12, 8, 13)
+	HALF_ROUND(X0, X1, X2, X3, X4, X5, X6, X7, X8, X9, X10, X11, X11, X13, X14)
+	SHUFFLE_INV(X2, X3, X4, X5, X6, X7, X8, X9)
+
+	SUBQ $1, BX; JCS done
+	LOAD_MSG(X8, X9, X10, X11, 2, 6, 0, 8, 12, 10, 11, 3)
+	HALF_ROUND(X0, X1, X2, X3, X4, X5, X6, X7, X8, X9, X10, X11, X11, X13, X14)
+	SHUFFLE(X2, X3, X4, X5, X6, X7, X8, X9)
+	LOAD_MSG(X8, X9, X10, X11, 4, 7, 15, 1, 13, 5, 14, 9)
+	HALF_ROUND(X0, X1, X2, X3, X4, X5, X6, X7, X8, X9, X10, X11, X11, X13, X14)
+	SHUFFLE_INV(X2, X3, X4, X5, X6, X7, X8, X9)
+
+	SUBQ $1, BX; JCS done
+	LOAD_MSG(X8, X9, X10, X11, 12, 1, 14, 4, 5, 15, 13, 10)
+	HALF_ROUND(X0, X1, X2, X3, X4, X5, X6, X7, X8, X9, X10, X11, X11, X13, X14)
+	SHUFFLE(X2, X3, X4, X5, X6, X7, X8, X9)
+	LOAD_MSG(X8, X9, X10, X11, 0, 6, 9, 8, 7, 3, 2, 11)
+	HALF_ROUND(X0, X1, X2, X3, X4, X5, X6, X7, X8, X9, X10, X11, X11, X13, X14)
+	SHUFFLE_INV(X2, X3, X4, X5, X6, X7, X8, X9)
+
+	SUBQ $1, BX; JCS done
+	LOAD_MSG(X8, X9, X10, X11, 13, 7, 12, 3, 11, 14, 1, 9)
+	HALF_ROUND(X0, X1, X2, X3, X4, X5, X6, X7, X8, X9, X10, X11, X11, X13, X14)
+	SHUFFLE(X2, X3, X4, X5, X6, X7, X8, X9)
+	LOAD_MSG(X8, X9, X10, X11, 5, 15, 8, 2, 0, 4, 6, 10)
+	HALF_ROUND(X0, X1, X2, X3, X4, X5, X6, X7, X8, X9, X10, X11, X11, X13, X14)
+	SHUFFLE_INV(X2, X3, X4, X5, X6, X7, X8, X9)
+
+	SUBQ $1, BX; JCS done
+	LOAD_MSG(X8, X9, X10, X11, 6, 14, 11, 0, 15, 9, 3, 8)
+	HALF_ROUND(X0, X1, X2, X3, X4, X5, X6, X7, X8, X9, X10, X11, X11, X13, X14)
+	SHUFFLE(X2, X3, X4, X5, X6, X7, X8, X9)
+	LOAD_MSG(X8, X9, X10, X11, 12, 13, 1, 10, 2, 7, 4, 5)
+	HALF_ROUND(X0, X1, X2, X3, X4, X5, X6, X7, X8, X9, X10, X11, X11, X13, X14)
+	SHUFFLE_INV(X2, X3, X4, X5, X6, X7, X8, X9)
+
+	SUBQ $1, BX; JCS done
+	LOAD_MSG(X8, X9, X10, X11, 10, 8, 7, 1, 2, 4, 6, 5)
+	HALF_ROUND(X0, X1, X2, X3, X4, X5, X6, X7, X8, X9, X10, X11, X11, X13, X14)
+	SHUFFLE(X2, X3, X4, X5, X6, X7, X8, X9)
+	LOAD_MSG(X8, X9, X10, X11, 15, 9, 3, 13, 11, 14, 12, 0)
+	HALF_ROUND(X0, X1, X2, X3, X4, X5, X6, X7, X8, X9, X10, X11, X11, X13, X14)
+	SHUFFLE_INV(X2, X3, X4, X5, X6, X7, X8, X9)
+
+	JMP loop
+
+done:
+	MOVOU 32(AX), X10
+	MOVOU 48(AX), X11
+	PXOR  X0, X12
+	PXOR  X1, X15
+	PXOR  X2, X10
+	PXOR  X3, X11
+	PXOR  X4, X12
+	PXOR  X5, X15
+	PXOR  X6, X10
+	PXOR  X7, X11
+	MOVOU X10, 32(AX)
+	MOVOU X11, 48(AX)
+
+	MOVOU X12, 0(AX)
+	MOVOU X15, 16(AX)
+
+	MOVQ BP, SP
+	RET
diff --git a/crypto/blake2b/blake2b_f_test.go b/crypto/blake2b/blake2b_f_test.go
new file mode 100644
index 000000000..4e07d131c
--- /dev/null
+++ b/crypto/blake2b/blake2b_f_test.go
@@ -0,0 +1,59 @@
+package blake2b
+
+import (
+	"fmt"
+	"reflect"
+	"testing"
+)
+
+func TestF(t *testing.T) {
+	for i, test := range testVectorsF {
+		t.Run(fmt.Sprintf("test vector %v", i), func(t *testing.T) {
+			//toEthereumTestCase(test)
+
+			h := test.hIn
+			F(&h, test.m, test.c, test.f, test.rounds)
+
+			if !reflect.DeepEqual(test.hOut, h) {
+				t.Errorf("Unexpected result\nExpected: [%#x]\nActual:   [%#x]\n", test.hOut, h)
+			}
+		})
+	}
+}
+
+type testVector struct {
+	hIn    [8]uint64
+	m      [16]uint64
+	c      [2]uint64
+	f      bool
+	rounds uint32
+	hOut   [8]uint64
+}
+
+// https://tools.ietf.org/html/rfc7693#appendix-A
+var testVectorsF = []testVector{
+	{
+		hIn: [8]uint64{
+			0x6a09e667f2bdc948, 0xbb67ae8584caa73b,
+			0x3c6ef372fe94f82b, 0xa54ff53a5f1d36f1,
+			0x510e527fade682d1, 0x9b05688c2b3e6c1f,
+			0x1f83d9abfb41bd6b, 0x5be0cd19137e2179,
+		},
+		m: [16]uint64{
+			0x0000000000636261, 0x0000000000000000, 0x0000000000000000,
+			0x0000000000000000, 0x0000000000000000, 0x0000000000000000,
+			0x0000000000000000, 0x0000000000000000, 0x0000000000000000,
+			0x0000000000000000, 0x0000000000000000, 0x0000000000000000,
+			0x0000000000000000, 0x0000000000000000, 0x0000000000000000,
+			0x0000000000000000,
+		},
+		c:      [2]uint64{3, 0},
+		f:      true,
+		rounds: 12,
+		hOut: [8]uint64{
+			0x0D4D1C983FA580BA, 0xE9F6129FB697276A, 0xB7C45A68142F214C,
+			0xD1A2FFDB6FBB124B, 0x2D79AB2A39C5877D, 0x95CC3345DED552C2,
+			0x5A92F1DBA88AD318, 0x239900D4ED8623B9,
+		},
+	},
+}
diff --git a/crypto/blake2b/f.go b/crypto/blake2b/blake2b_generic.go
index 63abd6d97..35c40cc92 100644
--- a/crypto/blake2b/f.go
+++ b/crypto/blake2b/blake2b_generic.go
@@ -2,21 +2,13 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// Modified by The Keep Network Authors to adjust
-// to EIP-152 precompile format.
-
 package blake2b
 
 import (
+	"encoding/binary"
 	"math/bits"
 )
 
-// IV is an initialization vector for BLAKE2b
-var IV = [8]uint64{
-	0x6a09e667f3bcc908, 0xbb67ae8584caa73b, 0x3c6ef372fe94f82b, 0xa54ff53a5f1d36f1,
-	0x510e527fade682d1, 0x9b05688c2b3e6c1f, 0x1f83d9abfb41bd6b, 0x5be0cd19137e2179,
-}
-
 // the precomputed values for BLAKE2b
 // there are 10 16-byte arrays - one for each round
 // the entries are calculated from the sigma constants.
@@ -33,24 +25,33 @@ var precomputed = [10][16]byte{
 	{10, 8, 7, 1, 2, 4, 6, 5, 15, 9, 3, 13, 11, 14, 12, 0},
 }
 
-// F is a compression function for BLAKE2b. It takes as an argument the state
-// vector `h`, message block vector `m`, offset counter `t`, final
-// block indicator flag `f`, and number of rounds `rounds`. The state vector
-// provided as the first parameter is modified by the function.
-func F(h *[8]uint64, m [16]uint64, c [2]uint64, f bool, rounds uint32) {
+func hashBlocksGeneric(h *[8]uint64, c *[2]uint64, flag uint64, blocks []byte) {
+	var m [16]uint64
 	c0, c1 := c[0], c[1]
 
+	for i := 0; i < len(blocks); {
+		c0 += BlockSize
+		if c0 < BlockSize {
+			c1++
+		}
+		for j := range m {
+			m[j] = binary.LittleEndian.Uint64(blocks[i:])
+			i += 8
+		}
+		fGeneric(h, &m, c0, c1, flag, 12)
+	}
+	c[0], c[1] = c0, c1
+}
+
+func fGeneric(h *[8]uint64, m *[16]uint64, c0, c1 uint64, flag uint64, rounds uint64) {
 	v0, v1, v2, v3, v4, v5, v6, v7 := h[0], h[1], h[2], h[3], h[4], h[5], h[6], h[7]
-	v8, v9, v10, v11, v12, v13, v14, v15 := IV[0], IV[1], IV[2], IV[3], IV[4], IV[5], IV[6], IV[7]
+	v8, v9, v10, v11, v12, v13, v14, v15 := iv[0], iv[1], iv[2], iv[3], iv[4], iv[5], iv[6], iv[7]
 	v12 ^= c0
 	v13 ^= c1
+	v14 ^= flag
 
-	if f {
-		v14 ^= 0xffffffffffffffff
-	}
-
-	for j := uint32(0); j < rounds; j++ {
-		s := &(precomputed[j%10])
+	for i := 0; i < int(rounds); i++ {
+		s := &(precomputed[i%10])
 
 		v0 += m[s[0]]
 		v0 += v4
@@ -167,9 +168,7 @@ func F(h *[8]uint64, m [16]uint64, c [2]uint64, f bool, rounds uint32) {
 		v9 += v14
 		v4 ^= v9
 		v4 = bits.RotateLeft64(v4, -63)
-
 	}
-
 	h[0] ^= v0 ^ v8
 	h[1] ^= v1 ^ v9
 	h[2] ^= v2 ^ v10
diff --git a/crypto/blake2b/blake2b_ref.go b/crypto/blake2b/blake2b_ref.go
new file mode 100644
index 000000000..88742139d
--- /dev/null
+++ b/crypto/blake2b/blake2b_ref.go
@@ -0,0 +1,15 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !amd64 appengine gccgo
+
+package blake2b
+
+func hashBlocks(h *[8]uint64, c *[2]uint64, flag uint64, blocks []byte) {
+	hashBlocksGeneric(h, c, flag, blocks)
+}
+
+func f(h *[8]uint64, m [16]uint64, c0, c1 uint64, flag uint64, rounds int) {
+	fGeneric(h, m, c0, c1, flag, rounds)
+}
diff --git a/crypto/blake2b/blake2b_test.go b/crypto/blake2b/blake2b_test.go
new file mode 100644
index 000000000..9e7297da1
--- /dev/null
+++ b/crypto/blake2b/blake2b_test.go
@@ -0,0 +1,871 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package blake2b
+
+import (
+	"bytes"
+	"encoding"
+	"encoding/hex"
+	"fmt"
+	"hash"
+	"io"
+	"testing"
+)
+
+func fromHex(s string) []byte {
+	b, err := hex.DecodeString(s)
+	if err != nil {
+		panic(err)
+	}
+	return b
+}
+
+func TestHashes(t *testing.T) {
+	defer func(sse4, avx, avx2 bool) {
+		useSSE4, useAVX, useAVX2 = sse4, avx, avx2
+	}(useSSE4, useAVX, useAVX2)
+
+	if useAVX2 {
+		t.Log("AVX2 version")
+		testHashes(t)
+		useAVX2 = false
+	}
+	if useAVX {
+		t.Log("AVX version")
+		testHashes(t)
+		useAVX = false
+	}
+	if useSSE4 {
+		t.Log("SSE4 version")
+		testHashes(t)
+		useSSE4 = false
+	}
+	t.Log("generic version")
+	testHashes(t)
+}
+
+func TestHashes2X(t *testing.T) {
+	defer func(sse4, avx, avx2 bool) {
+		useSSE4, useAVX, useAVX2 = sse4, avx, avx2
+	}(useSSE4, useAVX, useAVX2)
+
+	if useAVX2 {
+		t.Log("AVX2 version")
+		testHashes2X(t)
+		useAVX2 = false
+	}
+	if useAVX {
+		t.Log("AVX version")
+		testHashes2X(t)
+		useAVX = false
+	}
+	if useSSE4 {
+		t.Log("SSE4 version")
+		testHashes2X(t)
+		useSSE4 = false
+	}
+	t.Log("generic version")
+	testHashes2X(t)
+}
+
+func TestMarshal(t *testing.T) {
+	input := make([]byte, 255)
+	for i := range input {
+		input[i] = byte(i)
+	}
+	for _, size := range []int{Size, Size256, Size384, 12, 25, 63} {
+		for i := 0; i < 256; i++ {
+			h, err := New(size, nil)
+			if err != nil {
+				t.Fatalf("size=%d, len(input)=%d: error from New(%v, nil): %v", size, i, size, err)
+			}
+			h2, err := New(size, nil)
+			if err != nil {
+				t.Fatalf("size=%d, len(input)=%d: error from New(%v, nil): %v", size, i, size, err)
+			}
+
+			h.Write(input[:i/2])
+			halfstate, err := h.(encoding.BinaryMarshaler).MarshalBinary()
+			if err != nil {
+				t.Fatalf("size=%d, len(input)=%d: could not marshal: %v", size, i, err)
+			}
+			err = h2.(encoding.BinaryUnmarshaler).UnmarshalBinary(halfstate)
+			if err != nil {
+				t.Fatalf("size=%d, len(input)=%d: could not unmarshal: %v", size, i, err)
+			}
+
+			h.Write(input[i/2 : i])
+			sum := h.Sum(nil)
+			h2.Write(input[i/2 : i])
+			sum2 := h2.Sum(nil)
+
+			if !bytes.Equal(sum, sum2) {
+				t.Fatalf("size=%d, len(input)=%d: results do not match; sum = %v, sum2 = %v", size, i, sum, sum2)
+			}
+
+			h3, err := New(size, nil)
+			if err != nil {
+				t.Fatalf("size=%d, len(input)=%d: error from New(%v, nil): %v", size, i, size, err)
+			}
+			h3.Write(input[:i])
+			sum3 := h3.Sum(nil)
+			if !bytes.Equal(sum, sum3) {
+				t.Fatalf("size=%d, len(input)=%d: sum = %v, want %v", size, i, sum, sum3)
+			}
+		}
+	}
+}
+
+func testHashes(t *testing.T) {
+	key, _ := hex.DecodeString("000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f")
+
+	input := make([]byte, 255)
+	for i := range input {
+		input[i] = byte(i)
+	}
+
+	for i, expectedHex := range hashes {
+		h, err := New512(key)
+		if err != nil {
+			t.Fatalf("#%d: error from New512: %v", i, err)
+		}
+
+		h.Write(input[:i])
+		sum := h.Sum(nil)
+
+		if gotHex := fmt.Sprintf("%x", sum); gotHex != expectedHex {
+			t.Fatalf("#%d (single write): got %s, wanted %s", i, gotHex, expectedHex)
+		}
+
+		h.Reset()
+		for j := 0; j < i; j++ {
+			h.Write(input[j : j+1])
+		}
+
+		sum = h.Sum(sum[:0])
+		if gotHex := fmt.Sprintf("%x", sum); gotHex != expectedHex {
+			t.Fatalf("#%d (byte-by-byte): got %s, wanted %s", i, gotHex, expectedHex)
+		}
+	}
+}
+
+func testHashes2X(t *testing.T) {
+	key, _ := hex.DecodeString("000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f")
+
+	input := make([]byte, 256)
+	for i := range input {
+		input[i] = byte(i)
+	}
+
+	for i, expectedHex := range hashes2X {
+		length := uint32(len(expectedHex) / 2)
+		sum := make([]byte, int(length))
+
+		h, err := NewXOF(length, key)
+		if err != nil {
+			t.Fatalf("#%d: error from NewXOF: %v", i, err)
+		}
+
+		if _, err := h.Write(input); err != nil {
+			t.Fatalf("#%d (single write): error from Write: %v", i, err)
+		}
+		if _, err := h.Read(sum); err != nil {
+			t.Fatalf("#%d (single write): error from Read: %v", i, err)
+		}
+		if n, err := h.Read(sum); n != 0 || err != io.EOF {
+			t.Fatalf("#%d (single write): Read did not return (0, io.EOF) after exhaustion, got (%v, %v)", i, n, err)
+		}
+		if gotHex := fmt.Sprintf("%x", sum); gotHex != expectedHex {
+			t.Fatalf("#%d (single write): got %s, wanted %s", i, gotHex, expectedHex)
+		}
+
+		h.Reset()
+		for j := 0; j < len(input); j++ {
+			h.Write(input[j : j+1])
+		}
+		for j := 0; j < len(sum); j++ {
+			h = h.Clone()
+			if _, err := h.Read(sum[j : j+1]); err != nil {
+				t.Fatalf("#%d (byte-by-byte) - Read %d: error from Read: %v", i, j, err)
+			}
+		}
+		if gotHex := fmt.Sprintf("%x", sum); gotHex != expectedHex {
+			t.Fatalf("#%d (byte-by-byte): got %s, wanted %s", i, gotHex, expectedHex)
+		}
+	}
+
+	h, err := NewXOF(OutputLengthUnknown, key)
+	if err != nil {
+		t.Fatalf("#unknown length: error from NewXOF: %v", err)
+	}
+	if _, err := h.Write(input); err != nil {
+		t.Fatalf("#unknown length: error from Write: %v", err)
+	}
+
+	var result [64]byte
+	if n, err := h.Read(result[:]); err != nil {
+		t.Fatalf("#unknown length: error from Read: %v", err)
+	} else if n != len(result) {
+		t.Fatalf("#unknown length: Read returned %d bytes, want %d", n, len(result))
+	}
+
+	const expected = "3dbba8516da76bf7330055c66ea36cf1005e92714262b24d9710f51d9e126406e1bcd6497059f9331f1091c3634b695428d475ed432f987040575520a1c29f5e"
+	if fmt.Sprintf("%x", result) != expected {
+		t.Fatalf("#unknown length: bad result %x, wanted %s", result, expected)
+	}
+}
+
+func generateSequence(out []byte, seed uint32) {
+	a := 0xDEAD4BAD * seed // prime
+	b := uint32(1)
+
+	for i := range out { // fill the buf
+		a, b = b, a+b
+		out[i] = byte(b >> 24)
+	}
+}
+
+func computeMAC(msg []byte, hashSize int, key []byte) (sum []byte) {
+	var h hash.Hash
+	switch hashSize {
+	case Size:
+		h, _ = New512(key)
+	case Size384:
+		h, _ = New384(key)
+	case Size256:
+		h, _ = New256(key)
+	case 20:
+		h, _ = newDigest(20, key)
+	default:
+		panic("unexpected hashSize")
+	}
+
+	h.Write(msg)
+	return h.Sum(sum)
+}
+
+func computeHash(msg []byte, hashSize int) (sum []byte) {
+	switch hashSize {
+	case Size:
+		hash := Sum512(msg)
+		return hash[:]
+	case Size384:
+		hash := Sum384(msg)
+		return hash[:]
+	case Size256:
+		hash := Sum256(msg)
+		return hash[:]
+	case 20:
+		var hash [64]byte
+		checkSum(&hash, 20, msg)
+		return hash[:20]
+	default:
+		panic("unexpected hashSize")
+	}
+}
+
+// Test function from RFC 7693.
+func TestSelfTest(t *testing.T) {
+	hashLens := [4]int{20, 32, 48, 64}
+	msgLens := [6]int{0, 3, 128, 129, 255, 1024}
+
+	msg := make([]byte, 1024)
+	key := make([]byte, 64)
+
+	h, _ := New256(nil)
+	for _, hashSize := range hashLens {
+		for _, msgLength := range msgLens {
+			generateSequence(msg[:msgLength], uint32(msgLength)) // unkeyed hash
+
+			md := computeHash(msg[:msgLength], hashSize)
+			h.Write(md)
+
+			generateSequence(key[:], uint32(hashSize)) // keyed hash
+			md = computeMAC(msg[:msgLength], hashSize, key[:hashSize])
+			h.Write(md)
+		}
+	}
+
+	sum := h.Sum(nil)
+	expected := [32]byte{
+		0xc2, 0x3a, 0x78, 0x00, 0xd9, 0x81, 0x23, 0xbd,
+		0x10, 0xf5, 0x06, 0xc6, 0x1e, 0x29, 0xda, 0x56,
+		0x03, 0xd7, 0x63, 0xb8, 0xbb, 0xad, 0x2e, 0x73,
+		0x7f, 0x5e, 0x76, 0x5a, 0x7b, 0xcc, 0xd4, 0x75,
+	}
+	if !bytes.Equal(sum, expected[:]) {
+		t.Fatalf("got %x, wanted %x", sum, expected)
+	}
+}
+
+// Benchmarks
+
+func benchmarkSum(b *testing.B, size int, sse4, avx, avx2 bool) {
+	// Enable the correct set of instructions
+	defer func(sse4, avx, avx2 bool) {
+		useSSE4, useAVX, useAVX2 = sse4, avx, avx2
+	}(useSSE4, useAVX, useAVX2)
+	useSSE4, useAVX, useAVX2 = sse4, avx, avx2
+
+	data := make([]byte, size)
+	b.SetBytes(int64(size))
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		Sum512(data)
+	}
+}
+
+func benchmarkWrite(b *testing.B, size int, sse4, avx, avx2 bool) {
+	// Enable the correct set of instructions
+	defer func(sse4, avx, avx2 bool) {
+		useSSE4, useAVX, useAVX2 = sse4, avx, avx2
+	}(useSSE4, useAVX, useAVX2)
+	useSSE4, useAVX, useAVX2 = sse4, avx, avx2
+
+	data := make([]byte, size)
+	h, _ := New512(nil)
+	b.SetBytes(int64(size))
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		h.Write(data)
+	}
+}
+
+func BenchmarkWrite128Generic(b *testing.B) { benchmarkWrite(b, 128, false, false, false) }
+func BenchmarkWrite1KGeneric(b *testing.B)  { benchmarkWrite(b, 1024, false, false, false) }
+func BenchmarkWrite128SSE4(b *testing.B)    { benchmarkWrite(b, 128, true, false, false) }
+func BenchmarkWrite1KSSE4(b *testing.B)     { benchmarkWrite(b, 1024, true, false, false) }
+func BenchmarkWrite128AVX(b *testing.B)     { benchmarkWrite(b, 128, false, true, false) }
+func BenchmarkWrite1KAVX(b *testing.B)      { benchmarkWrite(b, 1024, false, true, false) }
+func BenchmarkWrite128AVX2(b *testing.B)    { benchmarkWrite(b, 128, false, false, true) }
+func BenchmarkWrite1KAVX2(b *testing.B)     { benchmarkWrite(b, 1024, false, false, true) }
+
+func BenchmarkSum128Generic(b *testing.B) { benchmarkSum(b, 128, false, false, false) }
+func BenchmarkSum1KGeneric(b *testing.B)  { benchmarkSum(b, 1024, false, false, false) }
+func BenchmarkSum128SSE4(b *testing.B)    { benchmarkSum(b, 128, true, false, false) }
+func BenchmarkSum1KSSE4(b *testing.B)     { benchmarkSum(b, 1024, true, false, false) }
+func BenchmarkSum128AVX(b *testing.B)     { benchmarkSum(b, 128, false, true, false) }
+func BenchmarkSum1KAVX(b *testing.B)      { benchmarkSum(b, 1024, false, true, false) }
+func BenchmarkSum128AVX2(b *testing.B)    { benchmarkSum(b, 128, false, false, true) }
+func BenchmarkSum1KAVX2(b *testing.B)     { benchmarkSum(b, 1024, false, false, true) }
+
+// These values were taken from https://blake2.net/blake2b-test.txt.
+var hashes = []string{
+	"10ebb67700b1868efb4417987acf4690ae9d972fb7a590c2f02871799aaa4786b5e996e8f0f4eb981fc214b005f42d2ff4233499391653df7aefcbc13fc51568",
+	"961f6dd1e4dd30f63901690c512e78e4b45e4742ed197c3c5e45c549fd25f2e4187b0bc9fe30492b16b0d0bc4ef9b0f34c7003fac09a5ef1532e69430234cebd",
+	"da2cfbe2d8409a0f38026113884f84b50156371ae304c4430173d08a99d9fb1b983164a3770706d537f49e0c916d9f32b95cc37a95b99d857436f0232c88a965",
+	"33d0825dddf7ada99b0e7e307104ad07ca9cfd9692214f1561356315e784f3e5a17e364ae9dbb14cb2036df932b77f4b292761365fb328de7afdc6d8998f5fc1",
+	"beaa5a3d08f3807143cf621d95cd690514d0b49efff9c91d24b59241ec0eefa5f60196d407048bba8d2146828ebcb0488d8842fd56bb4f6df8e19c4b4daab8ac",
+	"098084b51fd13deae5f4320de94a688ee07baea2800486689a8636117b46c1f4c1f6af7f74ae7c857600456a58a3af251dc4723a64cc7c0a5ab6d9cac91c20bb",
+	"6044540d560853eb1c57df0077dd381094781cdb9073e5b1b3d3f6c7829e12066bbaca96d989a690de72ca3133a83652ba284a6d62942b271ffa2620c9e75b1f",
+	"7a8cfe9b90f75f7ecb3acc053aaed6193112b6f6a4aeeb3f65d3de541942deb9e2228152a3c4bbbe72fc3b12629528cfbb09fe630f0474339f54abf453e2ed52",
+	"380beaf6ea7cc9365e270ef0e6f3a64fb902acae51dd5512f84259ad2c91f4bc4108db73192a5bbfb0cbcf71e46c3e21aee1c5e860dc96e8eb0b7b8426e6abe9",
+	"60fe3c4535e1b59d9a61ea8500bfac41a69dffb1ceadd9aca323e9a625b64da5763bad7226da02b9c8c4f1a5de140ac5a6c1124e4f718ce0b28ea47393aa6637",
+	"4fe181f54ad63a2983feaaf77d1e7235c2beb17fa328b6d9505bda327df19fc37f02c4b6f0368ce23147313a8e5738b5fa2a95b29de1c7f8264eb77b69f585cd",
+	"f228773ce3f3a42b5f144d63237a72d99693adb8837d0e112a8a0f8ffff2c362857ac49c11ec740d1500749dac9b1f4548108bf3155794dcc9e4082849e2b85b",
+	"962452a8455cc56c8511317e3b1f3b2c37df75f588e94325fdd77070359cf63a9ae6e930936fdf8e1e08ffca440cfb72c28f06d89a2151d1c46cd5b268ef8563",
+	"43d44bfa18768c59896bf7ed1765cb2d14af8c260266039099b25a603e4ddc5039d6ef3a91847d1088d401c0c7e847781a8a590d33a3c6cb4df0fab1c2f22355",
+	"dcffa9d58c2a4ca2cdbb0c7aa4c4c1d45165190089f4e983bb1c2cab4aaeff1fa2b5ee516fecd780540240bf37e56c8bcca7fab980e1e61c9400d8a9a5b14ac6",
+	"6fbf31b45ab0c0b8dad1c0f5f4061379912dde5aa922099a030b725c73346c524291adef89d2f6fd8dfcda6d07dad811a9314536c2915ed45da34947e83de34e",
+	"a0c65bddde8adef57282b04b11e7bc8aab105b99231b750c021f4a735cb1bcfab87553bba3abb0c3e64a0b6955285185a0bd35fb8cfde557329bebb1f629ee93",
+	"f99d815550558e81eca2f96718aed10d86f3f1cfb675cce06b0eff02f617c5a42c5aa760270f2679da2677c5aeb94f1142277f21c7f79f3c4f0cce4ed8ee62b1",
+	"95391da8fc7b917a2044b3d6f5374e1ca072b41454d572c7356c05fd4bc1e0f40b8bb8b4a9f6bce9be2c4623c399b0dca0dab05cb7281b71a21b0ebcd9e55670",
+	"04b9cd3d20d221c09ac86913d3dc63041989a9a1e694f1e639a3ba7e451840f750c2fc191d56ad61f2e7936bc0ac8e094b60caeed878c18799045402d61ceaf9",
+	"ec0e0ef707e4ed6c0c66f9e089e4954b058030d2dd86398fe84059631f9ee591d9d77375355149178c0cf8f8e7c49ed2a5e4f95488a2247067c208510fadc44c",
+	"9a37cce273b79c09913677510eaf7688e89b3314d3532fd2764c39de022a2945b5710d13517af8ddc0316624e73bec1ce67df15228302036f330ab0cb4d218dd",
+	"4cf9bb8fb3d4de8b38b2f262d3c40f46dfe747e8fc0a414c193d9fcf753106ce47a18f172f12e8a2f1c26726545358e5ee28c9e2213a8787aafbc516d2343152",
+	"64e0c63af9c808fd893137129867fd91939d53f2af04be4fa268006100069b2d69daa5c5d8ed7fddcb2a70eeecdf2b105dd46a1e3b7311728f639ab489326bc9",
+	"5e9c93158d659b2def06b0c3c7565045542662d6eee8a96a89b78ade09fe8b3dcc096d4fe48815d88d8f82620156602af541955e1f6ca30dce14e254c326b88f",
+	"7775dff889458dd11aef417276853e21335eb88e4dec9cfb4e9edb49820088551a2ca60339f12066101169f0dfe84b098fddb148d9da6b3d613df263889ad64b",
+	"f0d2805afbb91f743951351a6d024f9353a23c7ce1fc2b051b3a8b968c233f46f50f806ecb1568ffaa0b60661e334b21dde04f8fa155ac740eeb42e20b60d764",
+	"86a2af316e7d7754201b942e275364ac12ea8962ab5bd8d7fb276dc5fbffc8f9a28cae4e4867df6780d9b72524160927c855da5b6078e0b554aa91e31cb9ca1d",
+	"10bdf0caa0802705e706369baf8a3f79d72c0a03a80675a7bbb00be3a45e516424d1ee88efb56f6d5777545ae6e27765c3a8f5e493fc308915638933a1dfee55",
+	"b01781092b1748459e2e4ec178696627bf4ebafebba774ecf018b79a68aeb84917bf0b84bb79d17b743151144cd66b7b33a4b9e52c76c4e112050ff5385b7f0b",
+	"c6dbc61dec6eaeac81e3d5f755203c8e220551534a0b2fd105a91889945a638550204f44093dd998c076205dffad703a0e5cd3c7f438a7e634cd59fededb539e",
+	"eba51acffb4cea31db4b8d87e9bf7dd48fe97b0253ae67aa580f9ac4a9d941f2bea518ee286818cc9f633f2a3b9fb68e594b48cdd6d515bf1d52ba6c85a203a7",
+	"86221f3ada52037b72224f105d7999231c5e5534d03da9d9c0a12acb68460cd375daf8e24386286f9668f72326dbf99ba094392437d398e95bb8161d717f8991",
+	"5595e05c13a7ec4dc8f41fb70cb50a71bce17c024ff6de7af618d0cc4e9c32d9570d6d3ea45b86525491030c0d8f2b1836d5778c1ce735c17707df364d054347",
+	"ce0f4f6aca89590a37fe034dd74dd5fa65eb1cbd0a41508aaddc09351a3cea6d18cb2189c54b700c009f4cbf0521c7ea01be61c5ae09cb54f27bc1b44d658c82",
+	"7ee80b06a215a3bca970c77cda8761822bc103d44fa4b33f4d07dcb997e36d55298bceae12241b3fa07fa63be5576068da387b8d5859aeab701369848b176d42",
+	"940a84b6a84d109aab208c024c6ce9647676ba0aaa11f86dbb7018f9fd2220a6d901a9027f9abcf935372727cbf09ebd61a2a2eeb87653e8ecad1bab85dc8327",
+	"2020b78264a82d9f4151141adba8d44bf20c5ec062eee9b595a11f9e84901bf148f298e0c9f8777dcdbc7cc4670aac356cc2ad8ccb1629f16f6a76bcefbee760",
+	"d1b897b0e075ba68ab572adf9d9c436663e43eb3d8e62d92fc49c9be214e6f27873fe215a65170e6bea902408a25b49506f47babd07cecf7113ec10c5dd31252",
+	"b14d0c62abfa469a357177e594c10c194243ed2025ab8aa5ad2fa41ad318e0ff48cd5e60bec07b13634a711d2326e488a985f31e31153399e73088efc86a5c55",
+	"4169c5cc808d2697dc2a82430dc23e3cd356dc70a94566810502b8d655b39abf9e7f902fe717e0389219859e1945df1af6ada42e4ccda55a197b7100a30c30a1",
+	"258a4edb113d66c839c8b1c91f15f35ade609f11cd7f8681a4045b9fef7b0b24c82cda06a5f2067b368825e3914e53d6948ede92efd6e8387fa2e537239b5bee",
+	"79d2d8696d30f30fb34657761171a11e6c3f1e64cbe7bebee159cb95bfaf812b4f411e2f26d9c421dc2c284a3342d823ec293849e42d1e46b0a4ac1e3c86abaa",
+	"8b9436010dc5dee992ae38aea97f2cd63b946d94fedd2ec9671dcde3bd4ce9564d555c66c15bb2b900df72edb6b891ebcadfeff63c9ea4036a998be7973981e7",
+	"c8f68e696ed28242bf997f5b3b34959508e42d613810f1e2a435c96ed2ff560c7022f361a9234b9837feee90bf47922ee0fd5f8ddf823718d86d1e16c6090071",
+	"b02d3eee4860d5868b2c39ce39bfe81011290564dd678c85e8783f29302dfc1399ba95b6b53cd9ebbf400cca1db0ab67e19a325f2d115812d25d00978ad1bca4",
+	"7693ea73af3ac4dad21ca0d8da85b3118a7d1c6024cfaf557699868217bc0c2f44a199bc6c0edd519798ba05bd5b1b4484346a47c2cadf6bf30b785cc88b2baf",
+	"a0e5c1c0031c02e48b7f09a5e896ee9aef2f17fc9e18e997d7f6cac7ae316422c2b1e77984e5f3a73cb45deed5d3f84600105e6ee38f2d090c7d0442ea34c46d",
+	"41daa6adcfdb69f1440c37b596440165c15ada596813e2e22f060fcd551f24dee8e04ba6890387886ceec4a7a0d7fc6b44506392ec3822c0d8c1acfc7d5aebe8",
+	"14d4d40d5984d84c5cf7523b7798b254e275a3a8cc0a1bd06ebc0bee726856acc3cbf516ff667cda2058ad5c3412254460a82c92187041363cc77a4dc215e487",
+	"d0e7a1e2b9a447fee83e2277e9ff8010c2f375ae12fa7aaa8ca5a6317868a26a367a0b69fbc1cf32a55d34eb370663016f3d2110230eba754028a56f54acf57c",
+	"e771aa8db5a3e043e8178f39a0857ba04a3f18e4aa05743cf8d222b0b095825350ba422f63382a23d92e4149074e816a36c1cd28284d146267940b31f8818ea2",
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+}
+
+var hashes2X = []string{
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+	"a74c6d0d",
+	"eb02ae482a",
+	"be65b981275e",
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+	"074a02fa58d7c7c0",
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+	"ca3af2afc4afe891da78b1",
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+	"b09b653e85b72ef5cdf8fcfa95f3",
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+	"48ec6ec520f8e593d7b3f653eb15553de246723b81a6d0c3221aaa42a37420fba98a23796338dff5f845dce6d5a449be5ecc1887356619270461087e08d05fb60433a83d7bd00c002b09ea210b428965124b9b27d9105a71c826c1a2491cfd60e4cfa86c2da0c7100a8dc1c3f2f94b280d54e01e043acf0e966200d9fa8a41daf3b9382820786c75cadbb8841a1b2be5b6cbeb64878e4a231ae063a99b4e2308960ef0c8e2a16bb3545cc43bdf171493fb89a84f47e7973dc60cf75aeeca71e0a7ebe17d161d4fb9fe009941cc438f16a5bae6c99fcad08cac486eb2a48060b023d8730bf1d82fe60a2f036e6f52a5bff95f43bbe088933f",
+	"f4d84ed3e564c102600a795eaa9b1eaf4ad12f1a4deca1d042a0a2750ddf6201db03073d8bf553cb9dde48a1b0083827a609f7242b86584cc180964ae794b12ce55661e00e36a6ba4dbc389e6a5a85f1b45df9af7ead1b0a54db56e68639b9d438a91504e82c35d40c7bc7e048a53ac0b04accd0dadf4ac9884b0ca0e3cb5ba4336e3581be4c4760a553823ffa283a1120d4e145af56a59f2533903650f0b9e9ad9fe2e8a3c3c3dd03a1fcb709032c8835324839c735b0c051d0cbd8b5d867617c11023432e4bd275d3d0eb98a0b6cf58071a5b712922f2bc751ac7c2588c447444cde2f37a8ea5ec126425bf517e0d17c9e2999f52fee14b3",
+	"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",
+	"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",
+	"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",
+	"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",
+	"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",
+	"6e85c2f8e1fdc3aaeb969da1258cb504bbf0070cd03d23b3fb5ee08feea5ee2e0ee1c71a5d0f4f701b351f4e4b4d74cb1e2ae6184814f77b62d2f08134b7236ebf6b67d8a6c9f01b4248b30667c555f5d8646dbfe291151b23c9c9857e33a4d5c847be29a5ee7b402e03bac02d1a4319acc0dd8f25e9c7a266f5e5c896cc11b5b238df96a0963ae806cb277abc515c298a3e61a3036b177acf87a56ca4478c4c6d0d468913de602ec891318bbaf52c97a77c35c5b7d164816cf24e4c4b0b5f45853882f716d61eb947a45ce2efa78f1c70a918512af1ad536cbe6148083385b34e207f5f690d7a954021e4b5f4258a385fd8a87809a481f34202af4caccb82",
+	"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",
+}
diff --git a/crypto/blake2b/blake2x.go b/crypto/blake2b/blake2x.go
new file mode 100644
index 000000000..52c414db0
--- /dev/null
+++ b/crypto/blake2b/blake2x.go
@@ -0,0 +1,177 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package blake2b
+
+import (
+	"encoding/binary"
+	"errors"
+	"io"
+)
+
+// XOF defines the interface to hash functions that
+// support arbitrary-length output.
+type XOF interface {
+	// Write absorbs more data into the hash's state. It panics if called
+	// after Read.
+	io.Writer
+
+	// Read reads more output from the hash. It returns io.EOF if the limit
+	// has been reached.
+	io.Reader
+
+	// Clone returns a copy of the XOF in its current state.
+	Clone() XOF
+
+	// Reset resets the XOF to its initial state.
+	Reset()
+}
+
+// OutputLengthUnknown can be used as the size argument to NewXOF to indicate
+// the length of the output is not known in advance.
+const OutputLengthUnknown = 0
+
+// magicUnknownOutputLength is a magic value for the output size that indicates
+// an unknown number of output bytes.
+const magicUnknownOutputLength = (1 << 32) - 1
+
+// maxOutputLength is the absolute maximum number of bytes to produce when the
+// number of output bytes is unknown.
+const maxOutputLength = (1 << 32) * 64
+
+// NewXOF creates a new variable-output-length hash. The hash either produce a
+// known number of bytes (1 <= size < 2**32-1), or an unknown number of bytes
+// (size == OutputLengthUnknown). In the latter case, an absolute limit of
+// 256GiB applies.
+//
+// A non-nil key turns the hash into a MAC. The key must between
+// zero and 32 bytes long.
+func NewXOF(size uint32, key []byte) (XOF, error) {
+	if len(key) > Size {
+		return nil, errKeySize
+	}
+	if size == magicUnknownOutputLength {
+		// 2^32-1 indicates an unknown number of bytes and thus isn't a
+		// valid length.
+		return nil, errors.New("blake2b: XOF length too large")
+	}
+	if size == OutputLengthUnknown {
+		size = magicUnknownOutputLength
+	}
+	x := &xof{
+		d: digest{
+			size:   Size,
+			keyLen: len(key),
+		},
+		length: size,
+	}
+	copy(x.d.key[:], key)
+	x.Reset()
+	return x, nil
+}
+
+type xof struct {
+	d                digest
+	length           uint32
+	remaining        uint64
+	cfg, root, block [Size]byte
+	offset           int
+	nodeOffset       uint32
+	readMode         bool
+}
+
+func (x *xof) Write(p []byte) (n int, err error) {
+	if x.readMode {
+		panic("blake2b: write to XOF after read")
+	}
+	return x.d.Write(p)
+}
+
+func (x *xof) Clone() XOF {
+	clone := *x
+	return &clone
+}
+
+func (x *xof) Reset() {
+	x.cfg[0] = byte(Size)
+	binary.LittleEndian.PutUint32(x.cfg[4:], uint32(Size)) // leaf length
+	binary.LittleEndian.PutUint32(x.cfg[12:], x.length)    // XOF length
+	x.cfg[17] = byte(Size)                                 // inner hash size
+
+	x.d.Reset()
+	x.d.h[1] ^= uint64(x.length) << 32
+
+	x.remaining = uint64(x.length)
+	if x.remaining == magicUnknownOutputLength {
+		x.remaining = maxOutputLength
+	}
+	x.offset, x.nodeOffset = 0, 0
+	x.readMode = false
+}
+
+func (x *xof) Read(p []byte) (n int, err error) {
+	if !x.readMode {
+		x.d.finalize(&x.root)
+		x.readMode = true
+	}
+
+	if x.remaining == 0 {
+		return 0, io.EOF
+	}
+
+	n = len(p)
+	if uint64(n) > x.remaining {
+		n = int(x.remaining)
+		p = p[:n]
+	}
+
+	if x.offset > 0 {
+		blockRemaining := Size - x.offset
+		if n < blockRemaining {
+			x.offset += copy(p, x.block[x.offset:])
+			x.remaining -= uint64(n)
+			return
+		}
+		copy(p, x.block[x.offset:])
+		p = p[blockRemaining:]
+		x.offset = 0
+		x.remaining -= uint64(blockRemaining)
+	}
+
+	for len(p) >= Size {
+		binary.LittleEndian.PutUint32(x.cfg[8:], x.nodeOffset)
+		x.nodeOffset++
+
+		x.d.initConfig(&x.cfg)
+		x.d.Write(x.root[:])
+		x.d.finalize(&x.block)
+
+		copy(p, x.block[:])
+		p = p[Size:]
+		x.remaining -= uint64(Size)
+	}
+
+	if todo := len(p); todo > 0 {
+		if x.remaining < uint64(Size) {
+			x.cfg[0] = byte(x.remaining)
+		}
+		binary.LittleEndian.PutUint32(x.cfg[8:], x.nodeOffset)
+		x.nodeOffset++
+
+		x.d.initConfig(&x.cfg)
+		x.d.Write(x.root[:])
+		x.d.finalize(&x.block)
+
+		x.offset = copy(p, x.block[:todo])
+		x.remaining -= uint64(todo)
+	}
+	return
+}
+
+func (d *digest) initConfig(cfg *[Size]byte) {
+	d.offset, d.c[0], d.c[1] = 0, 0, 0
+	for i := range d.h {
+		d.h[i] = iv[i] ^ binary.LittleEndian.Uint64(cfg[i*8:])
+	}
+}
diff --git a/crypto/blake2b/f_test.go b/crypto/blake2b/f_test.go
deleted file mode 100644
index 5141d61cb..000000000
--- a/crypto/blake2b/f_test.go
+++ /dev/null
@@ -1,109 +0,0 @@
-package blake2b
-
-import (
-	"encoding/binary"
-	"encoding/hex"
-	"fmt"
-	"reflect"
-	"testing"
-)
-
-func TestF(t *testing.T) {
-	for i, test := range testVectorsF {
-		t.Run(fmt.Sprintf("test vector %v", i), func(t *testing.T) {
-			//toEthereumTestCase(test)
-
-			h := test.hIn
-
-			F(&h, test.m, test.c, test.f, test.rounds)
-
-			if !reflect.DeepEqual(test.hOut, h) {
-				t.Errorf("Unexpected result\nExpected: [%v]\nActual:   [%v]\n", test.hOut, h)
-			}
-		})
-	}
-}
-
-type testVector struct {
-	hIn    [8]uint64
-	m      [16]uint64
-	c      [2]uint64
-	f      bool
-	rounds uint32
-	hOut   [8]uint64
-}
-
-// https://tools.ietf.org/html/rfc7693#appendix-A
-var testVectorsF = []testVector{
-	{
-		hIn: [8]uint64{
-			0x6a09e667f2bdc948, 0xbb67ae8584caa73b,
-			0x3c6ef372fe94f82b, 0xa54ff53a5f1d36f1,
-			0x510e527fade682d1, 0x9b05688c2b3e6c1f,
-			0x1f83d9abfb41bd6b, 0x5be0cd19137e2179,
-		},
-		m: [16]uint64{
-			0x0000000000636261, 0x0000000000000000, 0x0000000000000000,
-			0x0000000000000000, 0x0000000000000000, 0x0000000000000000,
-			0x0000000000000000, 0x0000000000000000, 0x0000000000000000,
-			0x0000000000000000, 0x0000000000000000, 0x0000000000000000,
-			0x0000000000000000, 0x0000000000000000, 0x0000000000000000,
-			0x0000000000000000,
-		},
-		c:      [2]uint64{3, 0},
-		f:      true,
-		rounds: 12,
-		hOut: [8]uint64{
-			0x0D4D1C983FA580BA, 0xE9F6129FB697276A, 0xB7C45A68142F214C,
-			0xD1A2FFDB6FBB124B, 0x2D79AB2A39C5877D, 0x95CC3345DED552C2,
-			0x5A92F1DBA88AD318, 0x239900D4ED8623B9,
-		},
-	},
-}
-
-// toEthereumTestCase transforms F test vector into test vector format used by
-// go-ethereum precompiles
-func toEthereumTestCase(vector testVector) {
-	var memory [213]byte
-
-	// 4 bytes for rounds
-	binary.BigEndian.PutUint32(memory[0:4], uint32(vector.rounds))
-
-	// for h (512 bits = 64 bytes)
-	for i := 0; i < 8; i++ {
-		offset := 4 + i*8
-		binary.LittleEndian.PutUint64(memory[offset:offset+8], vector.hIn[i])
-
-	}
-
-	// for m (1024 bits = 128 bytes)
-	for i := 0; i < 16; i++ {
-		offset := 68 + i*8
-		binary.LittleEndian.PutUint64(memory[offset:offset+8], vector.m[i])
-	}
-
-	// 8 bytes for t[0], 8 bytes for t[1]
-	binary.LittleEndian.PutUint64(memory[196:204], vector.c[0])
-	binary.LittleEndian.PutUint64(memory[204:212], vector.c[1])
-
-	// 1 byte for f
-	if vector.f {
-		memory[212] = 1
-	}
-
-	fmt.Printf("input: \"%v\"\n", hex.EncodeToString(memory[:]))
-
-	var result [64]byte
-
-	binary.LittleEndian.PutUint64(result[0:8], vector.hOut[0])
-	binary.LittleEndian.PutUint64(result[8:16], vector.hOut[1])
-	binary.LittleEndian.PutUint64(result[16:24], vector.hOut[2])
-	binary.LittleEndian.PutUint64(result[24:32], vector.hOut[3])
-
-	binary.LittleEndian.PutUint64(result[32:40], vector.hOut[4])
-	binary.LittleEndian.PutUint64(result[40:48], vector.hOut[5])
-	binary.LittleEndian.PutUint64(result[48:56], vector.hOut[6])
-	binary.LittleEndian.PutUint64(result[56:64], vector.hOut[7])
-
-	fmt.Printf("expected: \"%v\"\n", hex.EncodeToString(result[:]))
-}
diff --git a/crypto/blake2b/register.go b/crypto/blake2b/register.go
new file mode 100644
index 000000000..efd689af4
--- /dev/null
+++ b/crypto/blake2b/register.go
@@ -0,0 +1,32 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build go1.9
+
+package blake2b
+
+import (
+	"crypto"
+	"hash"
+)
+
+func init() {
+	newHash256 := func() hash.Hash {
+		h, _ := New256(nil)
+		return h
+	}
+	newHash384 := func() hash.Hash {
+		h, _ := New384(nil)
+		return h
+	}
+
+	newHash512 := func() hash.Hash {
+		h, _ := New512(nil)
+		return h
+	}
+
+	crypto.RegisterHash(crypto.BLAKE2b_256, newHash256)
+	crypto.RegisterHash(crypto.BLAKE2b_384, newHash384)
+	crypto.RegisterHash(crypto.BLAKE2b_512, newHash512)
+}