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Просмотр файла: utils.js
/*! noble-hashes - MIT License (c) 2022 Paul Miller (paulmillr.com) */
// The import here is via the package name. This is to ensure
// that exports mapping/resolution does fall into place.
import { crypto } from '@noble/hashes/crypto';
// Cast array to different type
export const u8 = (arr) => new Uint8Array(arr.buffer, arr.byteOffset, arr.byteLength);
export const u32 = (arr) => new Uint32Array(arr.buffer, arr.byteOffset, Math.floor(arr.byteLength / 4));
// Cast array to view
export const createView = (arr) => new DataView(arr.buffer, arr.byteOffset, arr.byteLength);
// The rotate right (circular right shift) operation for uint32
export const rotr = (word, shift) => (word << (32 - shift)) | (word >>> shift);
export const isLE = new Uint8Array(new Uint32Array([0x11223344]).buffer)[0] === 0x44;
// There is almost no big endian hardware, but js typed arrays uses platform specific endianness.
// So, just to be sure not to corrupt anything.
if (!isLE)
throw new Error('Non little-endian hardware is not supported');
const hexes = Array.from({ length: 256 }, (v, i) => i.toString(16).padStart(2, '0'));
/**
* @example bytesToHex(Uint8Array.from([0xde, 0xad, 0xbe, 0xef]))
*/
export function bytesToHex(uint8a) {
// pre-caching improves the speed 6x
if (!(uint8a instanceof Uint8Array))
throw new Error('Uint8Array expected');
let hex = '';
for (let i = 0; i < uint8a.length; i++) {
hex += hexes[uint8a[i]];
}
return hex;
}
/**
* @example hexToBytes('deadbeef')
*/
export function hexToBytes(hex) {
if (typeof hex !== 'string') {
throw new TypeError('hexToBytes: expected string, got ' + typeof hex);
}
if (hex.length % 2)
throw new Error('hexToBytes: received invalid unpadded hex');
const array = new Uint8Array(hex.length / 2);
for (let i = 0; i < array.length; i++) {
const j = i * 2;
const hexByte = hex.slice(j, j + 2);
const byte = Number.parseInt(hexByte, 16);
if (Number.isNaN(byte) || byte < 0)
throw new Error('Invalid byte sequence');
array[i] = byte;
}
return array;
}
// There is no setImmediate in browser and setTimeout is slow. However, call to async function will return Promise
// which will be fullfiled only on next scheduler queue processing step and this is exactly what we need.
export const nextTick = async () => { };
// Returns control to thread each 'tick' ms to avoid blocking
export async function asyncLoop(iters, tick, cb) {
let ts = Date.now();
for (let i = 0; i < iters; i++) {
cb(i);
// Date.now() is not monotonic, so in case if clock goes backwards we return return control too
const diff = Date.now() - ts;
if (diff >= 0 && diff < tick)
continue;
await nextTick();
ts += diff;
}
}
export function utf8ToBytes(str) {
if (typeof str !== 'string') {
throw new TypeError(`utf8ToBytes expected string, got ${typeof str}`);
}
return new TextEncoder().encode(str);
}
export function toBytes(data) {
if (typeof data === 'string')
data = utf8ToBytes(data);
if (!(data instanceof Uint8Array))
throw new TypeError(`Expected input type is Uint8Array (got ${typeof data})`);
return data;
}
/**
* Concats Uint8Array-s into one; like `Buffer.concat([buf1, buf2])`
* @example concatBytes(buf1, buf2)
*/
export function concatBytes(...arrays) {
if (!arrays.every((a) => a instanceof Uint8Array))
throw new Error('Uint8Array list expected');
if (arrays.length === 1)
return arrays[0];
const length = arrays.reduce((a, arr) => a + arr.length, 0);
const result = new Uint8Array(length);
for (let i = 0, pad = 0; i < arrays.length; i++) {
const arr = arrays[i];
result.set(arr, pad);
pad += arr.length;
}
return result;
}
// For runtime check if class implements interface
export class Hash {
// Safe version that clones internal state
clone() {
return this._cloneInto();
}
}
// Check if object doens't have custom constructor (like Uint8Array/Array)
const isPlainObject = (obj) => Object.prototype.toString.call(obj) === '[object Object]' && obj.constructor === Object;
export function checkOpts(defaults, opts) {
if (opts !== undefined && (typeof opts !== 'object' || !isPlainObject(opts)))
throw new TypeError('Options should be object or undefined');
const merged = Object.assign(defaults, opts);
return merged;
}
export function wrapConstructor(hashConstructor) {
const hashC = (message) => hashConstructor().update(toBytes(message)).digest();
const tmp = hashConstructor();
hashC.outputLen = tmp.outputLen;
hashC.blockLen = tmp.blockLen;
hashC.create = () => hashConstructor();
return hashC;
}
export function wrapConstructorWithOpts(hashCons) {
const hashC = (msg, opts) => hashCons(opts).update(toBytes(msg)).digest();
const tmp = hashCons({});
hashC.outputLen = tmp.outputLen;
hashC.blockLen = tmp.blockLen;
hashC.create = (opts) => hashCons(opts);
return hashC;
}
/**
* Secure PRNG
*/
export function randomBytes(bytesLength = 32) {
if (crypto.web) {
return crypto.web.getRandomValues(new Uint8Array(bytesLength));
}
else if (crypto.node) {
return new Uint8Array(crypto.node.randomBytes(bytesLength).buffer);
}
else {
throw new Error("The environment doesn't have randomBytes function");
}
}
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