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231e468e19
git-subtree-dir: erigon-lib git-subtree-mainline:3c8cbda809git-subtree-split:93d9c9d9fe
43 lines
1.3 KiB
Go
43 lines
1.3 KiB
Go
/*
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Copyright 2022 The Erigon contributors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package crypto
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import (
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"github.com/holiman/uint256"
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"github.com/ledgerwatch/erigon-lib/common/hexutility"
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)
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var (
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secp256k1N = new(uint256.Int).SetBytes(hexutility.MustDecodeHex("fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141"))
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secp256k1halfN = new(uint256.Int).Rsh(secp256k1N, 1)
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)
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// See Appendix F "Signing Transactions" of the Yellow Paper
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func TransactionSignatureIsValid(v byte, r, s *uint256.Int, allowPreEip2s bool) bool {
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if r.IsZero() || s.IsZero() {
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return false
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}
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// See EIP-2: Homestead Hard-fork Changes
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if !allowPreEip2s && s.Gt(secp256k1halfN) {
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return false
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}
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return r.Lt(secp256k1N) && s.Lt(secp256k1N) && (v == 0 || v == 1)
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}
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