ceremonyclient/nekryptology/pkg/core/curves/ecdsa.go
2023-07-05 00:32:28 -05:00

39 lines
935 B
Go

//
// Copyright Coinbase, Inc. All Rights Reserved.
//
// SPDX-License-Identifier: Apache-2.0
//
package curves
import (
"crypto/ecdsa"
"math/big"
)
// EcdsaVerify runs a curve- or algorithm-specific ECDSA verification function on input
// an ECDSA public (verification) key, a message digest, and an ECDSA signature.
// It must return true if all the parameters are sane and the ECDSA signature is valid,
// and false otherwise
type EcdsaVerify func(pubKey *EcPoint, hash []byte, signature *EcdsaSignature) bool
// EcdsaSignature represents a (composite) digital signature
type EcdsaSignature struct {
V int
R, S *big.Int
}
// Static type assertion
var _ EcdsaVerify = VerifyEcdsa
// Verifies ECDSA signature using core types.
func VerifyEcdsa(pk *EcPoint, hash []byte, sig *EcdsaSignature) bool {
return ecdsa.Verify(
&ecdsa.PublicKey{
Curve: pk.Curve,
X: pk.X,
Y: pk.Y,
},
hash, sig.R, sig.S)
}