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// Copyright 2020 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build !go1.15
// ecdsa.VerifyASN1 was added in Go 1.15.
package wycheproof
import (
"crypto/ecdsa"
"math/big"
"golang.org/x/crypto/cryptobyte"
"golang.org/x/crypto/cryptobyte/asn1"
)
func verifyASN1(pub *ecdsa.PublicKey, hash, sig []byte) bool {
var (
r, s = &big.Int{}, &big.Int{}
inner cryptobyte.String
)
input := cryptobyte.String(sig)
if !input.ReadASN1(&inner, asn1.SEQUENCE) ||
!input.Empty() ||
!inner.ReadASN1Integer(r) ||
!inner.ReadASN1Integer(s) ||
!inner.Empty() {
return false
}
return ecdsa.Verify(pub, hash, r, s)
}
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