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[#93] Remove golang.org/x/crypto dependency

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Signed-off-by: Denis Kirillov <denis@nspcc.ru>
This commit is contained in:
Denis Kirillov 2021-12-10 16:56:04 +03:00 • committed by Alex Vanin
parent a2572a23a3
commit 2806d90089
18 changed files with 97 additions and 144 deletions
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28
util/signature/options.go
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@ -8,7 +8,7 @@ import (
"crypto/sha512"
"math/big"
"github.com/nspcc-dev/rfc6979"
"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
)
var curve = elliptic.P256()
@ -77,31 +77,15 @@ func SignWithRFC6979() SignOption {
}
func signRFC6979(key *ecdsa.PrivateKey, msg []byte) ([]byte, error) {
digest := sha256.Sum256(msg)
r, s := rfc6979.SignECDSA(key, digest[:], sha256.New)
return getSignatureSlice(key.Curve, r, s), nil
p := &keys.PrivateKey{PrivateKey: *key}
return p.Sign(msg), nil
}
func verifyRFC6979(pub *ecdsa.PublicKey, msg []byte, sig []byte) error {
func verifyRFC6979(key *ecdsa.PublicKey, msg []byte, sig []byte) error {
p := (*keys.PublicKey)(key)
h := sha256.Sum256(msg)
if pub.X == nil || pub.Y == nil || len(sig) != 64 {
return ErrInvalidSignature
}
rBytes := new(big.Int).SetBytes(sig[0:32])
sBytes := new(big.Int).SetBytes(sig[32:64])
if ecdsa.Verify(pub, h[:], rBytes, sBytes) {
if p.Verify(sig, h[:]) {
return nil
}
return ErrInvalidSignature
}
func getSignatureSlice(curve elliptic.Curve, r, s *big.Int) []byte {
params := curve.Params()
curveOrderByteSize := params.P.BitLen() / 8
signature := make([]byte, curveOrderByteSize*2)
_ = r.FillBytes(signature[:curveOrderByteSize])
_ = s.FillBytes(signature[curveOrderByteSize:])
return signature
}