1 files changed, 133 insertions, 0 deletions
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/crypto/ecdsa/ecdsa.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/crypto/ecdsa/ecdsa.go
new file mode 100644
index 000000000..49d5b28a2
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/crypto/ecdsa/ecdsa.go
@@ -0,0 +1,133 @@
+// Copyright 2018 The dexon-consensus-core Authors
+// This file is part of the dexon-consensus-core library.
+//
+// The dexon-consensus-core library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus-core library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus-core library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package ecdsa
+
+import (
+	"crypto/ecdsa"
+
+	dexCrypto "github.com/dexon-foundation/dexon/crypto"
+
+	"github.com/dexon-foundation/dexon-consensus-core/common"
+	"github.com/dexon-foundation/dexon-consensus-core/core/crypto"
+)
+
+const cryptoType = "ecdsa"
+
+func init() {
+	crypto.RegisterSigToPub(cryptoType, SigToPub)
+}
+
+// PrivateKey represents a private key structure used in geth and implments
+// Crypto.PrivateKey interface.
+type PrivateKey struct {
+	privateKey *ecdsa.PrivateKey
+}
+
+// PublicKey represents a public key structure used in geth and implements
+// Crypto.PublicKey interface.
+type PublicKey struct {
+	publicKey *ecdsa.PublicKey
+}
+
+// NewPrivateKey creates a new PrivateKey structure.
+func NewPrivateKey() (*PrivateKey, error) {
+	key, err := dexCrypto.GenerateKey()
+	if err != nil {
+		return nil, err
+	}
+	return &PrivateKey{privateKey: key}, nil
+}
+
+// NewPrivateKeyFromECDSA creates a new PrivateKey structure from
+// ecdsa.PrivateKey.
+func NewPrivateKeyFromECDSA(key *ecdsa.PrivateKey) *PrivateKey {
+	return &PrivateKey{privateKey: key}
+}
+
+// NewPublicKeyFromECDSA creates a new PublicKey structure from
+// ecdsa.PublicKey.
+func NewPublicKeyFromECDSA(key *ecdsa.PublicKey) *PublicKey {
+	return &PublicKey{publicKey: key}
+}
+
+// NewPublicKeyFromByteSlice constructs an eth.publicKey instance from
+// a byte slice.
+func NewPublicKeyFromByteSlice(b []byte) (crypto.PublicKey, error) {
+	pub, err := dexCrypto.UnmarshalPubkey(b)
+	if err != nil {
+		return &PublicKey{}, err
+	}
+	return &PublicKey{publicKey: pub}, nil
+}
+
+// PublicKey returns the public key associate this private key.
+func (prv *PrivateKey) PublicKey() crypto.PublicKey {
+	return NewPublicKeyFromECDSA(&(prv.privateKey.PublicKey))
+}
+
+// Sign calculates an ECDSA signature.
+//
+// This function is susceptible to chosen plaintext attacks that can leak
+// information about the private key that is used for signing. Callers must
+// be aware that the given hash cannot be chosen by an adversery. Common
+// solution is to hash any input before calculating the signature.
+//
+// The produced signature is in the [R || S || V] format where V is 0 or 1.
+func (prv *PrivateKey) Sign(hash common.Hash) (
+	sig crypto.Signature, err error) {
+	s, err := dexCrypto.Sign(hash[:], prv.privateKey)
+	sig = crypto.Signature{
+		Type:      cryptoType,
+		Signature: s,
+	}
+	return
+}
+
+// VerifySignature checks that the given public key created signature over hash.
+// The public key should be in compressed (33 bytes) or uncompressed (65 bytes)
+// format.
+// The signature should have the 64 byte [R || S] format.
+func (pub *PublicKey) VerifySignature(
+	hash common.Hash, signature crypto.Signature) bool {
+	sig := signature.Signature
+	if len(sig) == 65 {
+		// The last byte is for ecrecover.
+		sig = sig[:64]
+	}
+	return dexCrypto.VerifySignature(pub.Bytes(), hash[:], sig)
+}
+
+// Compress encodes a public key to the 33-byte compressed format.
+func (pub *PublicKey) Compress() []byte {
+	return dexCrypto.CompressPubkey(pub.publicKey)
+}
+
+// Bytes returns the []byte representation of uncompressed public key. (65 bytes)
+func (pub *PublicKey) Bytes() []byte {
+	return dexCrypto.FromECDSAPub(pub.publicKey)
+}
+
+// SigToPub returns the PublicKey that created the given signature.
+func SigToPub(
+	hash common.Hash, signature crypto.Signature) (crypto.PublicKey, error) {
+	key, err := dexCrypto.SigToPub(hash[:], signature.Signature[:])
+	if err != nil {
+		return &PublicKey{}, err
+	}
+	return &PublicKey{publicKey: key}, nil
+}