@zlattice/lattice-js/dist/cjs/crypto/sm2/rng.js

Lattice blockchain TypeScript SDK with dual module support (CJS + ESM)

"use strict";
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    var desc = Object.getOwnPropertyDescriptor(m, k);
    if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
      desc = { enumerable: true, get: function() { return m[k]; } };
    }
    Object.defineProperty(o, k2, desc);
}) : (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    o[k2] = m[k];
}));
var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
    Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
    o["default"] = v;
});
var __importStar = (this && this.__importStar) || (function () {
    var ownKeys = function(o) {
        ownKeys = Object.getOwnPropertyNames || function (o) {
            var ar = [];
            for (var k in o) if (Object.prototype.hasOwnProperty.call(o, k)) ar[ar.length] = k;
            return ar;
        };
        return ownKeys(o);
    };
    return function (mod) {
        if (mod && mod.__esModule) return mod;
        var result = {};
        if (mod != null) for (var k = ownKeys(mod), i = 0; i < k.length; i++) if (k[i] !== "default") __createBinding(result, mod, k[i]);
        __setModuleDefault(result, mod);
        return result;
    };
})();
Object.defineProperty(exports, "__esModule", { value: true });
exports.initRNGPool = initRNGPool;
exports.randomBytes = randomBytes;
const DEFAULT_PRNG_POOL_SIZE = 16384;
let prngPool = new Uint8Array(0);
let _syncCrypto;
async function initRNGPool() {
    if ('crypto' in globalThis) {
        _syncCrypto = globalThis.crypto;
        return; // no need to use pooling
    }
    if (prngPool.length > DEFAULT_PRNG_POOL_SIZE / 2)
        return; // there is sufficient number
    // we always populate full pool size
    // since numbers may be consumed during micro tasks.
    // @ts-ignore
    if ('wx' in globalThis && 'getRandomValues' in globalThis.wx) {
        prngPool = await new Promise(r => {
            wx.getRandomValues({
                length: DEFAULT_PRNG_POOL_SIZE,
                success(res) {
                    r(new Uint8Array(res.randomValues));
                }
            });
        });
    }
    else {
        // check if node or browser, use webcrypto if available
        try {
            // node 19+ and browser
            if (globalThis.crypto) {
                _syncCrypto = globalThis.crypto;
            }
            else {
                // node below 19
                const crypto = await Promise.resolve().then(() => __importStar(require(/* webpackIgnore: true */ '../../crypto/index.js')));
                _syncCrypto = crypto.webcrypto;
            }
            const array = new Uint8Array(DEFAULT_PRNG_POOL_SIZE);
            _syncCrypto.getRandomValues(array);
            prngPool = array;
        }
        catch (error) {
            throw new Error('no available csprng, abort.');
        }
    }
}
initRNGPool();
function consumePool(length) {
    if (prngPool.length > length) {
        const prng = prngPool.slice(0, length);
        prngPool = prngPool.slice(length);
        initRNGPool();
        return prng;
    }
    throw new Error('random number pool is not ready or insufficient, prevent getting too long random values or too often.');
}
function randomBytes(length = 0) {
    const array = new Uint8Array(length);
    if (_syncCrypto) {
        return _syncCrypto.getRandomValues(array);
    }
    // no sync crypto available, use async pool
    const result = consumePool(length);
    return result;
}
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