viem
Version:
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JavaScript
import { bytesToHex, hexToBytes, } from '../index.js';
/**
* @description Converts a signature into an [EIP-2098 compact signature](https://eips.ethereum.org/EIPS/eip-2098).
*
* @param signature The signature to convert.
* @returns The signature in compact format.
*
* @example
* signatureToCompactSignature({
* r: '0x68a020a209d3d56c46f38cc50a33f704f4a9a10a59377f8dd762ac66910e9b90',
* s: '0x7e865ad05c4035ab5792787d4a0297a43617ae897930a6fe4d822b8faea52064',
* v: 27n
* })
* // {
* // r: '0x68a020a209d3d56c46f38cc50a33f704f4a9a10a59377f8dd762ac66910e9b90',
* // yParityAndS: '0x7e865ad05c4035ab5792787d4a0297a43617ae897930a6fe4d822b8faea52064'
* // }
*/
export function signatureToCompactSignature(signature) {
const { r, s, v } = signature;
const yParity = v - 27n;
let yParityAndS = s;
if (yParity === 1n) {
const bytes = hexToBytes(s);
bytes[0] |= 0x80;
yParityAndS = bytesToHex(bytes);
}
return { r, yParityAndS };
}
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