@kevincharm/sparse-merkle-tree/dist/lib/utils.js

Sparse Merkle Tree implementation in Solidity with accompanying JS library

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.serialise = exports.deserialise = exports.keccak = void 0;
const utils_1 = require("@noble/hashes/utils");
const sha3_1 = require("@noble/hashes/sha3");
function numToBytes(value) {
    const hexRaw = value.toString(16);
    const hexPadded = hexRaw.padStart(32 * 2, '0');
    return (0, utils_1.hexToBytes)(hexPadded);
}
function bytesToNum(bytes) {
    return BigInt('0x' + (0, utils_1.bytesToHex)(bytes));
}
function keccak(...bytes) {
    if (bytes.every((v) => v === 0n)) {
        return 0n;
    }
    const buffer = (0, utils_1.concatBytes)(...bytes.map((b) => numToBytes(b)));
    return bytesToNum((0, sha3_1.keccak_256)(buffer));
}
exports.keccak = keccak;
/**
 * Default deserialiser hexstring -> bigint
 *
 * @param input Hex string e.g. "0xcafebabe"
 * @returns internal bigint representation
 */
function deserialise(input) {
    const isHex = /^0x[0-9a-fA-F]+$/.test(input);
    if (!isHex)
        throw new Error(`Not valid hex: ${input}`);
    return BigInt(input);
}
exports.deserialise = deserialise;
/**
 * Default serialiser bigint -> 0-padded 32-byte hexstring
 *
 * @param input bigint
 * @returns zero-padded 32-byte hexstring
 */
function serialise(input) {
    const hexRaw = input.toString(16);
    const hexPadded = hexRaw.padStart(32 * 2, '0');
    return `0x${hexPadded}`;
}
exports.serialise = serialise;