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author | Jimmy Hu <jimmy.hu@dexon.org> | 2018-08-08 11:28:57 +0800 |
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committer | GitHub <noreply@github.com> | 2018-08-08 11:28:57 +0800 |
commit | a418ea95c0f5afb50cbb78aedecc68373353d06e (patch) | |
tree | 79bee8ef152f58c0b3bbcbe38d4dd537050b72aa /crypto/eth/eth.go | |
parent | 3a929b656b6bd5846849fd98dc29ff761db97ed3 (diff) | |
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crypto: Add crypto module. (#34)
Diffstat (limited to 'crypto/eth/eth.go')
-rw-r--r-- | crypto/eth/eth.go | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/crypto/eth/eth.go b/crypto/eth/eth.go new file mode 100644 index 0000000..cb20d7d --- /dev/null +++ b/crypto/eth/eth.go @@ -0,0 +1,99 @@ +// 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 eth + +import ( + "crypto/ecdsa" + + ethcrypto "github.com/ethereum/go-ethereum/crypto" + + "github.com/dexon-foundation/dexon-consensus-core/common" + "github.com/dexon-foundation/dexon-consensus-core/crypto" +) + +// PrivateKey represents a private key structure used in geth and implments +// Crypto.PrivateKey interface. +type PrivateKey struct { + privateKey ecdsa.PrivateKey + publicKey PublicKey +} + +// PublicKey represents a public key structure used in geth and implements +// Crypto.PublicKey interface. +type PublicKey struct { + publicKey []byte +} + +// NewPrivateKey creates a new PrivateKey structure. +func NewPrivateKey() (*PrivateKey, error) { + key, err := ethcrypto.GenerateKey() + if err != nil { + return nil, err + } + return &PrivateKey{ + privateKey: *key, + publicKey: *newPublicKey(key), + }, nil +} + +// newPublicKey creates a new PublicKey structure. +func newPublicKey(prvKey *ecdsa.PrivateKey) *PublicKey { + return &PublicKey{ + publicKey: ethcrypto.CompressPubkey(&prvKey.PublicKey), + } +} + +// DecompressPubkey parses a public key in the 33-byte compressed format. +func DecompressPubkey(pubkey []byte) (PublicKey, error) { + _, err := ethcrypto.DecompressPubkey(pubkey) + return PublicKey{ + publicKey: pubkey, + }, err +} + +// PublicKey returns the public key associate this private key. +func (prv *PrivateKey) PublicKey() crypto.PublicKey { + return prv.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 := ethcrypto.Sign(hash[:], &prv.privateKey) + // Magic! + sig = crypto.Signature(s[:64]) + 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 { + return ethcrypto.VerifySignature(pub.publicKey, hash[:], signature) +} + +// Compress encodes a public key to the 33-byte compressed format. +func (pub PublicKey) Compress() []byte { + return pub.publicKey +} |