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rpc, evm: secure tx signing (#20)

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* rpc, evm: secure signing

* evm, ante: test signer

* tests
This commit is contained in:
Federico Kunze
2021-05-12 09:08:31 -04:00
committed by GitHub
parent decd0748ac
commit 65453e4aa0
13 changed files with 439 additions and 201 deletions
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crypto/ethsecp256k1/ethsecp256k1.go
+12 -7
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@@ -7,7 +7,6 @@ import (
"fmt"
ethcrypto "github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/crypto/secp256k1"
"github.com/cosmos/cosmos-sdk/codec"
cryptotypes "github.com/cosmos/cosmos-sdk/crypto/types"
@@ -105,10 +104,14 @@ func (privKey *PrivKey) UnmarshalAminoJSON(bz []byte) error {
}
// Sign creates a recoverable ECDSA signature on the secp256k1 curve over the
// Keccak256 hash of the provided message. The produced signature is 65 bytes
// provided hash of the message. The produced signature is 65 bytes
// where the last byte contains the recovery ID.
func (privKey PrivKey) Sign(msg []byte) ([]byte, error) {
return ethcrypto.Sign(ethcrypto.Keccak256Hash(msg).Bytes(), privKey.ToECDSA())
func (privKey PrivKey) Sign(digestBz []byte) ([]byte, error) {
if len(digestBz) != ethcrypto.DigestLength {
digestBz = ethcrypto.Keccak256Hash(digestBz).Bytes()
}
return ethcrypto.Sign(digestBz, privKey.ToECDSA())
}
// ToECDSA returns the ECDSA private key as a reference to ecdsa.PrivateKey type.
@@ -190,12 +193,14 @@ func (pubKey *PubKey) UnmarshalAminoJSON(bz []byte) error {
// VerifySignature verifies that the ECDSA public key created a given signature over
// the provided message. It will calculate the Keccak256 hash of the message
// prior to verification.
//
// CONTRACT: The signature should be in [R || S] format.
func (pubKey PubKey) VerifySignature(msg []byte, sig []byte) bool {
if len(sig) == 65 {
// remove recovery ID if contained in the signature
if len(sig) == ethcrypto.SignatureLength {
// remove recovery ID (V) if contained in the signature
sig = sig[:len(sig)-1]
}
// the signature needs to be in [R || S] format when provided to VerifySignature
return secp256k1.VerifySignature(pubKey.Key, ethcrypto.Keccak256Hash(msg).Bytes(), sig)
return ethcrypto.VerifySignature(pubKey.Key, ethcrypto.Keccak256Hash(msg).Bytes(), sig)
}