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43 lines
1.4 KiB
Go
43 lines
1.4 KiB
Go
// Copyright 2024 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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// Package secp256r1 implements signature verification for the P256VERIFY precompile.
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package secp256r1
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import (
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"crypto/ecdsa"
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"crypto/elliptic"
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"math/big"
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)
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func newPublicKey(x, y *big.Int) *ecdsa.PublicKey {
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if x == nil || y == nil || !elliptic.P256().IsOnCurve(x, y) {
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return nil
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}
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if x.Sign() == 0 && y.Sign() == 0 {
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return nil
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}
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return &ecdsa.PublicKey{Curve: elliptic.P256(), X: x, Y: y}
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}
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// Verify checks the given signature (r, s) for the given hash and public key (x, y).
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func Verify(hash []byte, r, s, x, y *big.Int) bool {
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publicKey := newPublicKey(x, y)
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if publicKey == nil {
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return false
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}
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return ecdsa.Verify(publicKey, hash, r, s)
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}
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