hashbro
83 lines
2.6 KiB
PHP
83 lines
2.6 KiB
PHP
<?php
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namespace App\Services\Chain;
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use Elliptic\EC;
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use kornrunner\Keccak;
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use RuntimeException;
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final class EthSigner
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{
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/**
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* Sign a legacy EIP-155 transaction.
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*
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* @param array{nonce: string, gasPrice: string, gas: string, to: string, value: string, data: string} $tx
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* @return string 0x-prefixed raw tx hex
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*/
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public static function signLegacy(string $privateKeyHex, array $tx, int $chainId): string
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{
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$privateKeyHex = strtolower($privateKeyHex);
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if (str_starts_with($privateKeyHex, '0x')) {
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$privateKeyHex = substr($privateKeyHex, 2);
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}
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$to = strtolower($tx['to']);
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if (str_starts_with($to, '0x')) {
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$to = substr($to, 2);
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}
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$data = strtolower($tx['data'] ?? '');
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if (str_starts_with($data, '0x')) {
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$data = substr($data, 2);
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}
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$fields = [
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EthRlp::intToBin($tx['nonce']),
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EthRlp::intToBin($tx['gasPrice']),
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EthRlp::intToBin($tx['gas']),
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hex2bin($to) ?: '',
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EthRlp::intToBin($tx['value']),
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$data === '' ? '' : (hex2bin($data) ?: ''),
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EthRlp::intToBin((string) $chainId),
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'',
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'',
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];
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$unsigned = EthRlp::encodeList($fields);
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$hash = Keccak::hash($unsigned, 256);
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$ec = new EC('secp256k1');
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$key = $ec->keyFromPrivate($privateKeyHex);
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$sig = $key->sign($hash, ['canonical' => true]);
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$r = str_pad($sig->r->toString(16), 64, '0', STR_PAD_LEFT);
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$s = str_pad($sig->s->toString(16), 64, '0', STR_PAD_LEFT);
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$recovery = (int) ($sig->recoveryParam ?? 0);
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$v = (string) ($recovery + 35 + $chainId * 2);
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$signed = EthRlp::encodeList([
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EthRlp::intToBin($tx['nonce']),
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EthRlp::intToBin($tx['gasPrice']),
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EthRlp::intToBin($tx['gas']),
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hex2bin($to) ?: '',
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EthRlp::intToBin($tx['value']),
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$data === '' ? '' : (hex2bin($data) ?: ''),
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EthRlp::intToBin($v),
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hex2bin($r) ?: '',
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hex2bin($s) ?: '',
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]);
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return '0x'.bin2hex($signed);
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}
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public static function publicAddress(string $privateKeyHex): string
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{
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$privateKeyHex = strtolower($privateKeyHex);
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if (str_starts_with($privateKeyHex, '0x')) {
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$privateKeyHex = substr($privateKeyHex, 2);
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}
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$ec = new EC('secp256k1');
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$pub = $ec->keyFromPrivate($privateKeyHex)->getPublic(false, 'hex');
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return EthAddress::fromUncompressedPublicKey($pub);
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}
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}
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