ccxt
Version:
143 lines (138 loc) • 5.2 kB
JavaScript
;
Object.defineProperty(exports, '__esModule', { value: true });
var crypto = require('./crypto.js');
/*! noble-hashes - MIT License (c) 2022 Paul Miller (paulmillr.com) */
const u32 = (arr) => new Uint32Array(arr.buffer, arr.byteOffset, Math.floor(arr.byteLength / 4));
// Cast array to view
const createView = (arr) => new DataView(arr.buffer, arr.byteOffset, arr.byteLength);
// The rotate right (circular right shift) operation for uint32
const rotr = (word, shift) => (word << (32 - shift)) | (word >>> shift);
// big-endian hardware is rare. Just in case someone still decides to run hashes:
// early-throw an error because we don't support BE yet.
const isLE = new Uint8Array(new Uint32Array([0x11223344]).buffer)[0] === 0x44;
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])) // 'deadbeef'
*/
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') // Uint8Array.from([0xde, 0xad, 0xbe, 0xef])
*/
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;
}
function utf8ToBytes(str) {
if (typeof str !== 'string') {
throw new TypeError(`utf8ToBytes expected string, got ${typeof str}`);
}
return new TextEncoder().encode(str);
}
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)
*/
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
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;
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;
}
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;
}
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. Uses `globalThis.crypto` or node.js crypto module.
*/
function randomBytes(bytesLength = 32) {
if (crypto.crypto && typeof crypto.crypto.getRandomValues === 'function') {
return crypto.crypto.getRandomValues(new Uint8Array(bytesLength));
}
throw new Error('crypto.getRandomValues must be defined');
}
const abytes = (b) => {
if (!(b instanceof Uint8Array || (ArrayBuffer.isView(b) && b.constructor.name === 'Uint8Array')))
throw new Error('Uint8Array expected');
};
exports.Hash = Hash;
exports.abytes = abytes;
exports.bytesToHex = bytesToHex;
exports.checkOpts = checkOpts;
exports.concatBytes = concatBytes;
exports.createView = createView;
exports.hexToBytes = hexToBytes;
exports.isLE = isLE;
exports.randomBytes = randomBytes;
exports.rotr = rotr;
exports.toBytes = toBytes;
exports.u32 = u32;
exports.utf8ToBytes = utf8ToBytes;
exports.wrapConstructor = wrapConstructor;
exports.wrapConstructorWithOpts = wrapConstructorWithOpts;