ipfs-web/backend/node_modules/@noble/hashes/utils.js

"use strict";
/*! noble-hashes - MIT License (c) 2022 Paul Miller (paulmillr.com) */
Object.defineProperty(exports, "__esModule", { value: true });
exports.randomBytes = exports.wrapXOFConstructorWithOpts = exports.wrapConstructorWithOpts = exports.wrapConstructor = exports.checkOpts = exports.Hash = exports.concatBytes = exports.toBytes = exports.utf8ToBytes = exports.asyncLoop = exports.nextTick = exports.hexToBytes = exports.bytesToHex = exports.isLE = exports.rotr = exports.createView = exports.u32 = exports.u8 = void 0;
// We use WebCrypto aka globalThis.crypto, which exists in browsers and node.js 16+.
// node.js versions earlier than v19 don't declare it in global scope.
// For node.js, package.json#exports field mapping rewrites import
// from `crypto` to `cryptoNode`, which imports native module.
// Makes the utils un-importable in browsers without a bundler.
// Once node.js 18 is deprecated, we can just drop the import.
const crypto_1 = require("@noble/hashes/crypto");
const u8a = (a) => a instanceof Uint8Array;
// Cast array to different type
const u8 = (arr) => new Uint8Array(arr.buffer, arr.byteOffset, arr.byteLength);
exports.u8 = u8;
const u32 = (arr) => new Uint32Array(arr.buffer, arr.byteOffset, Math.floor(arr.byteLength / 4));
exports.u32 = u32;
// Cast array to view
const createView = (arr) => new DataView(arr.buffer, arr.byteOffset, arr.byteLength);
exports.createView = createView;
// The rotate right (circular right shift) operation for uint32
const rotr = (word, shift) => (word << (32 - shift)) | (word >>> shift);
exports.rotr = rotr;
// 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.
exports.isLE = new Uint8Array(new Uint32Array([0x11223344]).buffer)[0] === 0x44;
if (!exports.isLE)
    throw new Error('Non little-endian hardware is not supported');
const hexes = /* @__PURE__ */ Array.from({ length: 256 }, (_, i) => i.toString(16).padStart(2, '0'));
/**
 * @example bytesToHex(Uint8Array.from([0xca, 0xfe, 0x01, 0x23])) // 'cafe0123'
 */
function bytesToHex(bytes) {
    if (!u8a(bytes))
        throw new Error('Uint8Array expected');
    // pre-caching improves the speed 6x
    let hex = '';
    for (let i = 0; i < bytes.length; i++) {
        hex += hexes[bytes[i]];
    }
    return hex;
}
exports.bytesToHex = bytesToHex;
/**
 * @example hexToBytes('cafe0123') // Uint8Array.from([0xca, 0xfe, 0x01, 0x23])
 */
function hexToBytes(hex) {
    if (typeof hex !== 'string')
        throw new Error('hex string expected, got ' + typeof hex);
    const len = hex.length;
    if (len % 2)
        throw new Error('padded hex string expected, got unpadded hex of length ' + len);
    const array = new Uint8Array(len / 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;
}
exports.hexToBytes = hexToBytes;
// There is no setImmediate in browser and setTimeout is slow.
// call of async fn will return Promise, which will be fullfiled only on
// next scheduler queue processing step and this is exactly what we need.
const nextTick = async () => { };
exports.nextTick = nextTick;
// Returns control to thread each 'tick' ms to avoid blocking
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 (0, exports.nextTick)();
        ts += diff;
    }
}
exports.asyncLoop = asyncLoop;
/**
 * @example utf8ToBytes('abc') // new Uint8Array([97, 98, 99])
 */
function utf8ToBytes(str) {
    if (typeof str !== 'string')
        throw new Error(`utf8ToBytes expected string, got ${typeof str}`);
    return new Uint8Array(new TextEncoder().encode(str)); // https://bugzil.la/1681809
}
exports.utf8ToBytes = utf8ToBytes;
/**
 * Normalizes (non-hex) string or Uint8Array to Uint8Array.
 * Warning: when Uint8Array is passed, it would NOT get copied.
 * Keep in mind for future mutable operations.
 */
function toBytes(data) {
    if (typeof data === 'string')
        data = utf8ToBytes(data);
    if (!u8a(data))
        throw new Error(`expected Uint8Array, got ${typeof data}`);
    return data;
}
exports.toBytes = toBytes;
/**
 * Copies several Uint8Arrays into one.
 */
function concatBytes(...arrays) {
    const r = new Uint8Array(arrays.reduce((sum, a) => sum + a.length, 0));
    let pad = 0; // walk through each item, ensure they have proper type
    arrays.forEach((a) => {
        if (!u8a(a))
            throw new Error('Uint8Array expected');
        r.set(a, pad);
        pad += a.length;
    });
    return r;
}
exports.concatBytes = concatBytes;
// For runtime check if class implements interface
class Hash {
    // Safe version that clones internal state
    clone() {
        return this._cloneInto();
    }
}
exports.Hash = Hash;
const toStr = {}.toString;
function checkOpts(defaults, opts) {
    if (opts !== undefined && toStr.call(opts) !== '[object Object]')
        throw new Error('Options should be object or undefined');
    const merged = Object.assign(defaults, opts);
    return merged;
}
exports.checkOpts = checkOpts;
function wrapConstructor(hashCons) {
    const hashC = (msg) => hashCons().update(toBytes(msg)).digest();
    const tmp = hashCons();
    hashC.outputLen = tmp.outputLen;
    hashC.blockLen = tmp.blockLen;
    hashC.create = () => hashCons();
    return hashC;
}
exports.wrapConstructor = wrapConstructor;
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;
}
exports.wrapConstructorWithOpts = wrapConstructorWithOpts;
function wrapXOFConstructorWithOpts(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;
}
exports.wrapXOFConstructorWithOpts = wrapXOFConstructorWithOpts;
/**
 * Secure PRNG. Uses `crypto.getRandomValues`, which defers to OS.
 */
function randomBytes(bytesLength = 32) {
    if (crypto_1.crypto && typeof crypto_1.crypto.getRandomValues === 'function') {
        return crypto_1.crypto.getRandomValues(new Uint8Array(bytesLength));
    }
    throw new Error('crypto.getRandomValues must be defined');
}
exports.randomBytes = randomBytes;
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