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crypto/core/curves/ecdsa.go

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+//
+// 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)
+}