@polkadot/util-crypto
Version:
A collection of useful crypto utilities for @polkadot
40 lines (39 loc) • 1.37 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.xxhashAsHex = void 0;
exports.xxhashAsU8a = xxhashAsU8a;
const util_1 = require("@polkadot/util");
const wasm_crypto_1 = require("@polkadot/wasm-crypto");
const helpers_js_1 = require("../helpers.js");
const xxhash64_js_1 = require("./xxhash64.js");
/**
* @name xxhashAsU8a
* @summary Creates a xxhash64 u8a from the input.
* @description
* From either a `string`, `Uint8Array` or a `Buffer` input, create the xxhash64 and return the result as a `Uint8Array` with the specified `bitLength`.
* @example
* <BR>
*
* ```javascript
* import { xxhashAsU8a } from '@polkadot/util-crypto';
*
* xxhashAsU8a('abc'); // => 0x44bc2cf5ad770999
* ```
*/
function xxhashAsU8a(data, bitLength = 64, onlyJs) {
const rounds = Math.ceil(bitLength / 64);
const u8a = (0, util_1.u8aToU8a)(data);
if (!util_1.hasBigInt || (!onlyJs && (0, wasm_crypto_1.isReady)())) {
return (0, wasm_crypto_1.twox)(u8a, rounds);
}
const result = new Uint8Array(rounds * 8);
for (let seed = 0; seed < rounds; seed++) {
result.set((0, xxhash64_js_1.xxhash64)(u8a, seed).reverse(), seed * 8);
}
return result;
}
/**
* @name xxhashAsHex
* @description Creates a xxhash64 hex from the input.
*/
exports.xxhashAsHex = (0, helpers_js_1.createAsHex)(xxhashAsU8a);