You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
141 lines
4.2 KiB
141 lines
4.2 KiB
package secp256k1
|
|
|
|
import (
|
|
"bytes"
|
|
"crypto/sha256"
|
|
"crypto/subtle"
|
|
"fmt"
|
|
"io"
|
|
|
|
"golang.org/x/crypto/ripemd160"
|
|
|
|
secp256k1 "github.com/btcsuite/btcd/btcec"
|
|
|
|
amino "github.com/tendermint/go-amino"
|
|
|
|
"github.com/tendermint/tendermint/crypto"
|
|
)
|
|
|
|
//-------------------------------------
|
|
const (
|
|
PrivKeyAminoName = "tendermint/PrivKeySecp256k1"
|
|
PubKeyAminoName = "tendermint/PubKeySecp256k1"
|
|
)
|
|
|
|
var cdc = amino.NewCodec()
|
|
|
|
func init() {
|
|
cdc.RegisterInterface((*crypto.PubKey)(nil), nil)
|
|
cdc.RegisterConcrete(PubKeySecp256k1{},
|
|
PubKeyAminoName, nil)
|
|
|
|
cdc.RegisterInterface((*crypto.PrivKey)(nil), nil)
|
|
cdc.RegisterConcrete(PrivKeySecp256k1{},
|
|
PrivKeyAminoName, nil)
|
|
}
|
|
|
|
//-------------------------------------
|
|
|
|
var _ crypto.PrivKey = PrivKeySecp256k1{}
|
|
|
|
// PrivKeySecp256k1 implements PrivKey.
|
|
type PrivKeySecp256k1 [32]byte
|
|
|
|
// Bytes marshalls the private key using amino encoding.
|
|
func (privKey PrivKeySecp256k1) Bytes() []byte {
|
|
return cdc.MustMarshalBinaryBare(privKey)
|
|
}
|
|
|
|
// PubKey performs the point-scalar multiplication from the privKey on the
|
|
// generator point to get the pubkey.
|
|
func (privKey PrivKeySecp256k1) PubKey() crypto.PubKey {
|
|
_, pubkeyObject := secp256k1.PrivKeyFromBytes(secp256k1.S256(), privKey[:])
|
|
var pubkeyBytes PubKeySecp256k1
|
|
copy(pubkeyBytes[:], pubkeyObject.SerializeCompressed())
|
|
return pubkeyBytes
|
|
}
|
|
|
|
// Equals - you probably don't need to use this.
|
|
// Runs in constant time based on length of the keys.
|
|
func (privKey PrivKeySecp256k1) Equals(other crypto.PrivKey) bool {
|
|
if otherSecp, ok := other.(PrivKeySecp256k1); ok {
|
|
return subtle.ConstantTimeCompare(privKey[:], otherSecp[:]) == 1
|
|
}
|
|
return false
|
|
}
|
|
|
|
// GenPrivKey generates a new ECDSA private key on curve secp256k1 private key.
|
|
// It uses OS randomness in conjunction with the current global random seed
|
|
// in tendermint/libs/common to generate the private key.
|
|
func GenPrivKey() PrivKeySecp256k1 {
|
|
return genPrivKey(crypto.CReader())
|
|
}
|
|
|
|
// genPrivKey generates a new secp256k1 private key using the provided reader.
|
|
func genPrivKey(rand io.Reader) PrivKeySecp256k1 {
|
|
privKeyBytes := [32]byte{}
|
|
_, err := io.ReadFull(rand, privKeyBytes[:])
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
// crypto.CRandBytes is guaranteed to be 32 bytes long, so it can be
|
|
// casted to PrivKeySecp256k1.
|
|
return PrivKeySecp256k1(privKeyBytes)
|
|
}
|
|
|
|
// GenPrivKeySecp256k1 hashes the secret with SHA2, and uses
|
|
// that 32 byte output to create the private key.
|
|
// NOTE: secret should be the output of a KDF like bcrypt,
|
|
// if it's derived from user input.
|
|
func GenPrivKeySecp256k1(secret []byte) PrivKeySecp256k1 {
|
|
privKey32 := sha256.Sum256(secret)
|
|
// sha256.Sum256() is guaranteed to be 32 bytes long, so it can be
|
|
// casted to PrivKeySecp256k1.
|
|
return PrivKeySecp256k1(privKey32)
|
|
}
|
|
|
|
//-------------------------------------
|
|
|
|
var _ crypto.PubKey = PubKeySecp256k1{}
|
|
|
|
// PubKeySecp256k1Size is comprised of 32 bytes for one field element
|
|
// (the x-coordinate), plus one byte for the parity of the y-coordinate.
|
|
const PubKeySecp256k1Size = 33
|
|
|
|
// PubKeySecp256k1 implements crypto.PubKey.
|
|
// It is the compressed form of the pubkey. The first byte depends is a 0x02 byte
|
|
// if the y-coordinate is the lexicographically largest of the two associated with
|
|
// the x-coordinate. Otherwise the first byte is a 0x03.
|
|
// This prefix is followed with the x-coordinate.
|
|
type PubKeySecp256k1 [PubKeySecp256k1Size]byte
|
|
|
|
// Address returns a Bitcoin style addresses: RIPEMD160(SHA256(pubkey))
|
|
func (pubKey PubKeySecp256k1) Address() crypto.Address {
|
|
hasherSHA256 := sha256.New()
|
|
hasherSHA256.Write(pubKey[:]) // does not error
|
|
sha := hasherSHA256.Sum(nil)
|
|
|
|
hasherRIPEMD160 := ripemd160.New()
|
|
hasherRIPEMD160.Write(sha) // does not error
|
|
return crypto.Address(hasherRIPEMD160.Sum(nil))
|
|
}
|
|
|
|
// Bytes returns the pubkey marshalled with amino encoding.
|
|
func (pubKey PubKeySecp256k1) Bytes() []byte {
|
|
bz, err := cdc.MarshalBinaryBare(pubKey)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
return bz
|
|
}
|
|
|
|
func (pubKey PubKeySecp256k1) String() string {
|
|
return fmt.Sprintf("PubKeySecp256k1{%X}", pubKey[:])
|
|
}
|
|
|
|
func (pubKey PubKeySecp256k1) Equals(other crypto.PubKey) bool {
|
|
if otherSecp, ok := other.(PubKeySecp256k1); ok {
|
|
return bytes.Equal(pubKey[:], otherSecp[:])
|
|
}
|
|
return false
|
|
}
|