viem
Version:
36 lines • 1.75 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.recoverPublicKey = recoverPublicKey;
const isHex_js_1 = require("../data/isHex.js");
const fromHex_js_1 = require("../encoding/fromHex.js");
const toHex_js_1 = require("../encoding/toHex.js");
async function recoverPublicKey({ hash, signature, }) {
const hashHex = (0, isHex_js_1.isHex)(hash) ? hash : (0, toHex_js_1.toHex)(hash);
const { secp256k1 } = await Promise.resolve().then(() => require('@noble/curves/secp256k1'));
const signature_ = (() => {
if (typeof signature === 'object' && 'r' in signature && 's' in signature) {
const { r, s, v, yParity } = signature;
const yParityOrV = Number(yParity ?? v);
const recoveryBit = toRecoveryBit(yParityOrV);
return new secp256k1.Signature((0, fromHex_js_1.hexToBigInt)(r), (0, fromHex_js_1.hexToBigInt)(s)).addRecoveryBit(recoveryBit);
}
const signatureHex = (0, isHex_js_1.isHex)(signature) ? signature : (0, toHex_js_1.toHex)(signature);
const yParityOrV = (0, fromHex_js_1.hexToNumber)(`0x${signatureHex.slice(130)}`);
const recoveryBit = toRecoveryBit(yParityOrV);
return secp256k1.Signature.fromCompact(signatureHex.substring(2, 130)).addRecoveryBit(recoveryBit);
})();
const publicKey = signature_
.recoverPublicKey(hashHex.substring(2))
.toHex(false);
return `0x${publicKey}`;
}
function toRecoveryBit(yParityOrV) {
if (yParityOrV === 0 || yParityOrV === 1)
return yParityOrV;
if (yParityOrV === 27)
return 0;
if (yParityOrV === 28)
return 1;
throw new Error('Invalid yParityOrV value');
}
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