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crypto, crypto/ecies, crypto/secp256k1: libsecp256k1 scalar mult

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thanks to Felix Lange (fjl) for help with design & impl
This commit is contained in:
Gustav Simonsson
2015-09-29 19:37:44 +02:00
parent 27a50c8f4b
commit c8ad64f33c
16 changed files with 321 additions and 171 deletions
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26
crypto/crypto.go
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@ -43,14 +43,6 @@ import (
"golang.org/x/crypto/ripemd160"
)
var secp256k1n *big.Int
func init() {
// specify the params for the s256 curve
ecies.AddParamsForCurve(S256(), ecies.ECIES_AES128_SHA256)
secp256k1n = common.String2Big("0xfffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141")
}
func Sha3(data ...[]byte) []byte {
d := sha3.NewKeccak256()
for _, b := range data {
@ -99,9 +91,9 @@ func ToECDSA(prv []byte) *ecdsa.PrivateKey {
}
priv := new(ecdsa.PrivateKey)
priv.PublicKey.Curve = S256()
priv.PublicKey.Curve = secp256k1.S256()
priv.D = common.BigD(prv)
priv.PublicKey.X, priv.PublicKey.Y = S256().ScalarBaseMult(prv)
priv.PublicKey.X, priv.PublicKey.Y = secp256k1.S256().ScalarBaseMult(prv)
return priv
}
@ -116,15 +108,15 @@ func ToECDSAPub(pub []byte) *ecdsa.PublicKey {
if len(pub) == 0 {
return nil
}
x, y := elliptic.Unmarshal(S256(), pub)
return &ecdsa.PublicKey{S256(), x, y}
x, y := elliptic.Unmarshal(secp256k1.S256(), pub)
return &ecdsa.PublicKey{secp256k1.S256(), x, y}
}
func FromECDSAPub(pub *ecdsa.PublicKey) []byte {
if pub == nil || pub.X == nil || pub.Y == nil {
return nil
}
return elliptic.Marshal(S256(), pub.X, pub.Y)
return elliptic.Marshal(secp256k1.S256(), pub.X, pub.Y)
}
// HexToECDSA parses a secp256k1 private key.
@ -168,7 +160,7 @@ func SaveECDSA(file string, key *ecdsa.PrivateKey) error {
}
func GenerateKey() (*ecdsa.PrivateKey, error) {
return ecdsa.GenerateKey(S256(), rand.Reader)
return ecdsa.GenerateKey(secp256k1.S256(), rand.Reader)
}
func ValidateSignatureValues(v byte, r, s *big.Int) bool {
@ -176,7 +168,7 @@ func ValidateSignatureValues(v byte, r, s *big.Int) bool {
return false
}
vint := uint32(v)
if r.Cmp(secp256k1n) < 0 && s.Cmp(secp256k1n) < 0 && (vint == 27 || vint == 28) {
if r.Cmp(secp256k1.N) < 0 && s.Cmp(secp256k1.N) < 0 && (vint == 27 || vint == 28) {
return true
} else {
return false
@ -189,8 +181,8 @@ func SigToPub(hash, sig []byte) (*ecdsa.PublicKey, error) {
return nil, err
}
x, y := elliptic.Unmarshal(S256(), s)
return &ecdsa.PublicKey{S256(), x, y}, nil
x, y := elliptic.Unmarshal(secp256k1.S256(), s)
return &ecdsa.PublicKey{secp256k1.S256(), x, y}, nil
}
func Sign(hash []byte, prv *ecdsa.PrivateKey) (sig []byte, err error) {