viem
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JavaScript
import { hexToBytes } from '../encoding/toBytes.js';
import { bytesToHex } from '../encoding/toHex.js';
/**
* @description Converts an [EIP-2098 compact signature](https://eips.ethereum.org/EIPS/eip-2098) into signature format.
*
* @param signature The compact signature to convert.
* @returns The compact signature in signature format.
*
* @example
* compactSignatureToSignature({
* r: '0x68a020a209d3d56c46f38cc50a33f704f4a9a10a59377f8dd762ac66910e9b90',
* yParityAndS: '0x7e865ad05c4035ab5792787d4a0297a43617ae897930a6fe4d822b8faea52064',
* })
* // {
* // r: '0x68a020a209d3d56c46f38cc50a33f704f4a9a10a59377f8dd762ac66910e9b90',
* // s: '0x7e865ad05c4035ab5792787d4a0297a43617ae897930a6fe4d822b8faea52064',
* // v: 27n
* // }
*/
export function compactSignatureToSignature({ r, yParityAndS, }) {
const yParityAndS_bytes = hexToBytes(yParityAndS);
const yParity = yParityAndS_bytes[0] & 0x80 ? 1 : 0;
const s = yParityAndS_bytes;
if (yParity === 1)
s[0] &= 0x7f;
return { r, s: bytesToHex(s), yParity };
}
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