1 files changed, 0 insertions, 167 deletions
diff --git a/crypto/secp256k1/secp256.go b/crypto/secp256k1/secp256.go
deleted file mode 100644
index 35d0eef34..000000000
--- a/crypto/secp256k1/secp256.go
+++ /dev/null
@@ -1,167 +0,0 @@
-// Copyright 2015 Jeffrey Wilcke, Felix Lange, Gustav Simonsson. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be found in
-// the LICENSE file.
-
-// Package secp256k1 wraps the bitcoin secp256k1 C library.
-package secp256k1
-
-/*
-#cgo CFLAGS: -I./libsecp256k1
-#cgo CFLAGS: -I./libsecp256k1/src/
-#define USE_NUM_NONE
-#define USE_FIELD_10X26
-#define USE_FIELD_INV_BUILTIN
-#define USE_SCALAR_8X32
-#define USE_SCALAR_INV_BUILTIN
-#define NDEBUG
-#include "./libsecp256k1/src/secp256k1.c"
-#include "./libsecp256k1/src/modules/recovery/main_impl.h"
-#include "ext.h"
-
-typedef void (*callbackFunc) (const char* msg, void* data);
-extern void secp256k1GoPanicIllegal(const char* msg, void* data);
-extern void secp256k1GoPanicError(const char* msg, void* data);
-*/
-import "C"
-
-import (
-	"errors"
-	"math/big"
-	"unsafe"
-)
-
-var context *C.secp256k1_context
-
-func init() {
-	// around 20 ms on a modern CPU.
-	context = C.secp256k1_context_create_sign_verify()
-	C.secp256k1_context_set_illegal_callback(context, C.callbackFunc(C.secp256k1GoPanicIllegal), nil)
-	C.secp256k1_context_set_error_callback(context, C.callbackFunc(C.secp256k1GoPanicError), nil)
-}
-
-var (
-	ErrInvalidMsgLen       = errors.New("invalid message length, need 32 bytes")
-	ErrInvalidSignatureLen = errors.New("invalid signature length")
-	ErrInvalidRecoveryID   = errors.New("invalid signature recovery id")
-	ErrInvalidKey          = errors.New("invalid private key")
-	ErrInvalidPubkey       = errors.New("invalid public key")
-	ErrSignFailed          = errors.New("signing failed")
-	ErrRecoverFailed       = errors.New("recovery failed")
-)
-
-// Sign creates a recoverable ECDSA signature.
-// The produced signature is in the 65-byte [R || S || V] format where V is 0 or 1.
-//
-// The caller is responsible for ensuring that msg cannot be chosen
-// directly by an attacker. It is usually preferable to use a cryptographic
-// hash function on any input before handing it to this function.
-func Sign(msg []byte, seckey []byte) ([]byte, error) {
-	if len(msg) != 32 {
-		return nil, ErrInvalidMsgLen
-	}
-	if len(seckey) != 32 {
-		return nil, ErrInvalidKey
-	}
-	seckeydata := (*C.uchar)(unsafe.Pointer(&seckey[0]))
-	if C.secp256k1_ec_seckey_verify(context, seckeydata) != 1 {
-		return nil, ErrInvalidKey
-	}
-
-	var (
-		msgdata   = (*C.uchar)(unsafe.Pointer(&msg[0]))
-		noncefunc = C.secp256k1_nonce_function_rfc6979
-		sigstruct C.secp256k1_ecdsa_recoverable_signature
-	)
-	if C.secp256k1_ecdsa_sign_recoverable(context, &sigstruct, msgdata, seckeydata, noncefunc, nil) == 0 {
-		return nil, ErrSignFailed
-	}
-
-	var (
-		sig     = make([]byte, 65)
-		sigdata = (*C.uchar)(unsafe.Pointer(&sig[0]))
-		recid   C.int
-	)
-	C.secp256k1_ecdsa_recoverable_signature_serialize_compact(context, sigdata, &recid, &sigstruct)
-	sig[64] = byte(recid) // add back recid to get 65 bytes sig
-	return sig, nil
-}
-
-// RecoverPubkey returns the public key of the signer.
-// msg must be the 32-byte hash of the message to be signed.
-// sig must be a 65-byte compact ECDSA signature containing the
-// recovery id as the last element.
-func RecoverPubkey(msg []byte, sig []byte) ([]byte, error) {
-	if len(msg) != 32 {
-		return nil, ErrInvalidMsgLen
-	}
-	if err := checkSignature(sig); err != nil {
-		return nil, err
-	}
-
-	var (
-		pubkey  = make([]byte, 65)
-		sigdata = (*C.uchar)(unsafe.Pointer(&sig[0]))
-		msgdata = (*C.uchar)(unsafe.Pointer(&msg[0]))
-	)
-	if C.secp256k1_ext_ecdsa_recover(context, (*C.uchar)(unsafe.Pointer(&pubkey[0])), sigdata, msgdata) == 0 {
-		return nil, ErrRecoverFailed
-	}
-	return pubkey, nil
-}
-
-// VerifySignature checks that the given pubkey created signature over message.
-// The signature should be in [R || S] format.
-func VerifySignature(pubkey, msg, signature []byte) bool {
-	if len(msg) != 32 || len(signature) != 64 || len(pubkey) == 0 {
-		return false
-	}
-	sigdata := (*C.uchar)(unsafe.Pointer(&signature[0]))
-	msgdata := (*C.uchar)(unsafe.Pointer(&msg[0]))
-	keydata := (*C.uchar)(unsafe.Pointer(&pubkey[0]))
-	return C.secp256k1_ext_ecdsa_verify(context, sigdata, msgdata, keydata, C.size_t(len(pubkey))) != 0
-}
-
-// DecompressPubkey parses a public key in the 33-byte compressed format.
-// It returns non-nil coordinates if the public key is valid.
-func DecompressPubkey(pubkey []byte) (x, y *big.Int) {
-	if len(pubkey) != 33 {
-		return nil, nil
-	}
-	var (
-		pubkeydata = (*C.uchar)(unsafe.Pointer(&pubkey[0]))
-		pubkeylen  = C.size_t(len(pubkey))
-		out        = make([]byte, 65)
-		outdata    = (*C.uchar)(unsafe.Pointer(&out[0]))
-		outlen     = C.size_t(len(out))
-	)
-	if C.secp256k1_ext_reencode_pubkey(context, outdata, outlen, pubkeydata, pubkeylen) == 0 {
-		return nil, nil
-	}
-	return new(big.Int).SetBytes(out[1:33]), new(big.Int).SetBytes(out[33:])
-}
-
-// CompressPubkey encodes a public key to 33-byte compressed format.
-func CompressPubkey(x, y *big.Int) []byte {
-	var (
-		pubkey     = S256().Marshal(x, y)
-		pubkeydata = (*C.uchar)(unsafe.Pointer(&pubkey[0]))
-		pubkeylen  = C.size_t(len(pubkey))
-		out        = make([]byte, 33)
-		outdata    = (*C.uchar)(unsafe.Pointer(&out[0]))
-		outlen     = C.size_t(len(out))
-	)
-	if C.secp256k1_ext_reencode_pubkey(context, outdata, outlen, pubkeydata, pubkeylen) == 0 {
-		panic("libsecp256k1 error")
-	}
-	return out
-}
-
-func checkSignature(sig []byte) error {
-	if len(sig) != 65 {
-		return ErrInvalidSignatureLen
-	}
-	if sig[64] >= 4 {
-		return ErrInvalidRecoveryID
-	}
-	return nil
-}