viem/_esm/utils/authorization/hashAuthorization.js

TypeScript Interface for Ethereum

import { concatHex } from '../data/concat.js';
import { hexToBytes } from '../encoding/toBytes.js';
import { numberToHex } from '../encoding/toHex.js';
import { toRlp } from '../encoding/toRlp.js';
import { keccak256 } from '../hash/keccak256.js';
/**
 * Computes an Authorization hash in [EIP-7702 format](https://eips.ethereum.org/EIPS/eip-7702): `keccak256('0x05' || rlp([chain_id, address, nonce]))`.
 */
export function hashAuthorization(parameters) {
    const { chainId, nonce, to } = parameters;
    const address = parameters.contractAddress ?? parameters.address;
    const hash = keccak256(concatHex([
        '0x05',
        toRlp([
            chainId ? numberToHex(chainId) : '0x',
            address,
            nonce ? numberToHex(nonce) : '0x',
        ]),
    ]));
    if (to === 'bytes')
        return hexToBytes(hash);
    return hash;
}
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