bigint-crypto-utils/dist/esm/index.browser.js

function abs(a) {
    return (a >= 0) ? a : -a;
}

function bitLength(a) {
    if (typeof a === 'number')
        a = BigInt(a);
    if (a === 1n) {
        return 1;
    }
    let bits = 1;
    do {
        bits++;
    } while ((a >>= 1n) > 1n);
    return bits;
}

function eGcd(a, b) {
    if (typeof a === 'number')
        a = BigInt(a);
    if (typeof b === 'number')
        b = BigInt(b);
    if (a <= 0n || b <= 0n)
        throw new RangeError('a and b MUST be > 0');
    let x = 0n;
    let y = 1n;
    let u = 1n;
    let v = 0n;
    while (a !== 0n) {
        const q = b / a;
        const r = b % a;
        const m = x - (u * q);
        const n = y - (v * q);
        b = a;
        a = r;
        x = u;
        y = v;
        u = m;
        v = n;
    }
    return {
        g: b,
        x,
        y
    };
}

function gcd(a, b) {
    let aAbs = (typeof a === 'number') ? BigInt(abs(a)) : abs(a);
    let bAbs = (typeof b === 'number') ? BigInt(abs(b)) : abs(b);
    if (aAbs === 0n) {
        return bAbs;
    }
    else if (bAbs === 0n) {
        return aAbs;
    }
    let shift = 0n;
    while (((aAbs | bAbs) & 1n) === 0n) {
        aAbs >>= 1n;
        bAbs >>= 1n;
        shift++;
    }
    while ((aAbs & 1n) === 0n)
        aAbs >>= 1n;
    do {
        while ((bAbs & 1n) === 0n)
            bAbs >>= 1n;
        if (aAbs > bAbs) {
            const x = aAbs;
            aAbs = bAbs;
            bAbs = x;
        }
        bAbs -= aAbs;
    } while (bAbs !== 0n);
    return aAbs << shift;
}

function lcm(a, b) {
    if (typeof a === 'number')
        a = BigInt(a);
    if (typeof b === 'number')
        b = BigInt(b);
    if (a === 0n && b === 0n)
        return BigInt(0);
    return abs((a / gcd(a, b)) * b);
}

function max(a, b) {
    return (a >= b) ? a : b;
}

function min(a, b) {
    return (a >= b) ? b : a;
}

function toZn(a, n) {
    if (typeof a === 'number')
        a = BigInt(a);
    if (typeof n === 'number')
        n = BigInt(n);
    if (n <= 0n) {
        throw new RangeError('n must be > 0');
    }
    const aZn = a % n;
    return (aZn < 0n) ? aZn + n : aZn;
}

function modInv(a, n) {
    const egcd = eGcd(toZn(a, n), n);
    if (egcd.g !== 1n) {
        throw new RangeError(`${a.toString()} does not have inverse modulo ${n.toString()}`);
    }
    else {
        return toZn(egcd.x, n);
    }
}

function modPow(b, e, n) {
    if (typeof b === 'number')
        b = BigInt(b);
    if (typeof e === 'number')
        e = BigInt(e);
    if (typeof n === 'number')
        n = BigInt(n);
    if (n <= 0n) {
        throw new RangeError('n must be > 0');
    }
    else if (n === 1n) {
        return 0n;
    }
    b = toZn(b, n);
    if (e < 0n) {
        return modInv(modPow(b, abs(e), n), n);
    }
    let r = 1n;
    while (e > 0) {
        if ((e % 2n) === 1n) {
            r = r * b % n;
        }
        e = e / 2n;
        b = b ** 2n % n;
    }
    return r;
}

function fromBuffer(buf) {
    let ret = 0n;
    for (const i of buf.values()) {
        const bi = BigInt(i);
        ret = (ret << 8n) + bi;
    }
    return ret;
}

function randBytes(byteLength, forceLength = false) {
    if (byteLength < 1)
        throw new RangeError('byteLength MUST be > 0');
    return new Promise(function (resolve, reject) {
        {
            const buf = new Uint8Array(byteLength);
            if (byteLength <= 65536) {
                self.crypto.getRandomValues(buf);
            }
            else {
                for (let i = 0; i < Math.ceil(byteLength / 65536); i++) {
                    const begin = i * 65536;
                    const end = ((begin + 65535) < byteLength) ? begin + 65535 : byteLength - 1;
                    self.crypto.getRandomValues(buf.subarray(begin, end));
                }
            }
            if (forceLength)
                buf[0] = buf[0] | 128;
            resolve(buf);
        }
    });
}
function randBytesSync(byteLength, forceLength = false) {
    if (byteLength < 1)
        throw new RangeError('byteLength MUST be > 0');
    {
        const buf = new Uint8Array(byteLength);
        if (byteLength <= 65536) {
            self.crypto.getRandomValues(buf);
        }
        else {
            for (let i = 0; i < Math.ceil(byteLength / 65536); i++) {
                const begin = i * 65536;
                const end = ((begin + 65535) < byteLength) ? begin + 65535 : byteLength - 1;
                self.crypto.getRandomValues(buf.subarray(begin, end));
            }
        }
        if (forceLength)
            buf[0] = buf[0] | 128;
        return buf;
    }
}

function randBits(bitLength, forceLength = false) {
    if (bitLength < 1)
        throw new RangeError('bitLength MUST be > 0');
    const byteLength = Math.ceil(bitLength / 8);
    const bitLengthMod8 = bitLength % 8;
    return new Promise((resolve, reject) => {
        randBytes(byteLength, false).then(function (rndBytes) {
            if (bitLengthMod8 !== 0) {
                rndBytes[0] = rndBytes[0] & (2 ** bitLengthMod8 - 1);
            }
            if (forceLength) {
                const mask = (bitLengthMod8 !== 0) ? 2 ** (bitLengthMod8 - 1) : 128;
                rndBytes[0] = rndBytes[0] | mask;
            }
            resolve(rndBytes);
        });
    });
}
function randBitsSync(bitLength, forceLength = false) {
    if (bitLength < 1)
        throw new RangeError('bitLength MUST be > 0');
    const byteLength = Math.ceil(bitLength / 8);
    const rndBytes = randBytesSync(byteLength, false);
    const bitLengthMod8 = bitLength % 8;
    if (bitLengthMod8 !== 0) {
        rndBytes[0] = rndBytes[0] & (2 ** bitLengthMod8 - 1);
    }
    if (forceLength) {
        const mask = (bitLengthMod8 !== 0) ? 2 ** (bitLengthMod8 - 1) : 128;
        rndBytes[0] = rndBytes[0] | mask;
    }
    return rndBytes;
}

function randBetween(max, min = 1n) {
    if (max <= min)
        throw new RangeError('Arguments MUST be: max > min');
    const interval = max - min;
    const bitLen = bitLength(interval);
    let rnd;
    do {
        const buf = randBitsSync(bitLen);
        rnd = fromBuffer(buf);
    } while (rnd > interval);
    return rnd + min;
}

function _workerUrl(workerCode) {
    workerCode = `(() => {${workerCode}})()`;
    const _blob = new Blob([workerCode], { type: 'text/javascript' });
    return window.URL.createObjectURL(_blob);
}
let _useWorkers = false;
{
    if (self.Worker !== undefined)
        _useWorkers = true;
}

function isProbablyPrime(w, iterations = 16, disableWorkers = false) {
    if (typeof w === 'number') {
        w = BigInt(w);
    }
    if (w < 0n)
        throw RangeError('w MUST be >= 0');
    {
        return new Promise((resolve, reject) => {
            const worker = new Worker(_isProbablyPrimeWorkerUrl());
            worker.onmessage = (event) => {
                if (event?.data?._bcu?.isPrime !== undefined) {
                    worker.terminate();
                    resolve(event.data._bcu.isPrime);
                }
            };
            worker.onmessageerror = (event) => {
                reject(event);
            };
            const msg = {
                _bcu: {
                    rnd: w,
                    iterations,
                    id: 0
                }
            };
            worker.postMessage(msg);
        });
    }
}
function _isProbablyPrime(w, iterations) {
    if (w === 2n)
        return true;
    else if ((w & 1n) === 0n || w === 1n)
        return false;
    const firstPrimes = [
        3n,
        5n,
        7n,
        11n,
        13n,
        17n,
        19n,
        23n,
        29n,
        31n,
        37n,
        41n,
        43n,
        47n,
        53n,
        59n,
        61n,
        67n,
        71n,
        73n,
        79n,
        83n,
        89n,
        97n,
        101n,
        103n,
        107n,
        109n,
        113n,
        127n,
        131n,
        137n,
        139n,
        149n,
        151n,
        157n,
        163n,
        167n,
        173n,
        179n,
        181n,
        191n,
        193n,
        197n,
        199n,
        211n,
        223n,
        227n,
        229n,
        233n,
        239n,
        241n,
        251n,
        257n,
        263n,
        269n,
        271n,
        277n,
        281n,
        283n,
        293n,
        307n,
        311n,
        313n,
        317n,
        331n,
        337n,
        347n,
        349n,
        353n,
        359n,
        367n,
        373n,
        379n,
        383n,
        389n,
        397n,
        401n,
        409n,
        419n,
        421n,
        431n,
        433n,
        439n,
        443n,
        449n,
        457n,
        461n,
        463n,
        467n,
        479n,
        487n,
        491n,
        499n,
        503n,
        509n,
        521n,
        523n,
        541n,
        547n,
        557n,
        563n,
        569n,
        571n,
        577n,
        587n,
        593n,
        599n,
        601n,
        607n,
        613n,
        617n,
        619n,
        631n,
        641n,
        643n,
        647n,
        653n,
        659n,
        661n,
        673n,
        677n,
        683n,
        691n,
        701n,
        709n,
        719n,
        727n,
        733n,
        739n,
        743n,
        751n,
        757n,
        761n,
        769n,
        773n,
        787n,
        797n,
        809n,
        811n,
        821n,
        823n,
        827n,
        829n,
        839n,
        853n,
        857n,
        859n,
        863n,
        877n,
        881n,
        883n,
        887n,
        907n,
        911n,
        919n,
        929n,
        937n,
        941n,
        947n,
        953n,
        967n,
        971n,
        977n,
        983n,
        991n,
        997n,
        1009n,
        1013n,
        1019n,
        1021n,
        1031n,
        1033n,
        1039n,
        1049n,
        1051n,
        1061n,
        1063n,
        1069n,
        1087n,
        1091n,
        1093n,
        1097n,
        1103n,
        1109n,
        1117n,
        1123n,
        1129n,
        1151n,
        1153n,
        1163n,
        1171n,
        1181n,
        1187n,
        1193n,
        1201n,
        1213n,
        1217n,
        1223n,
        1229n,
        1231n,
        1237n,
        1249n,
        1259n,
        1277n,
        1279n,
        1283n,
        1289n,
        1291n,
        1297n,
        1301n,
        1303n,
        1307n,
        1319n,
        1321n,
        1327n,
        1361n,
        1367n,
        1373n,
        1381n,
        1399n,
        1409n,
        1423n,
        1427n,
        1429n,
        1433n,
        1439n,
        1447n,
        1451n,
        1453n,
        1459n,
        1471n,
        1481n,
        1483n,
        1487n,
        1489n,
        1493n,
        1499n,
        1511n,
        1523n,
        1531n,
        1543n,
        1549n,
        1553n,
        1559n,
        1567n,
        1571n,
        1579n,
        1583n,
        1597n
    ];
    for (let i = 0; i < firstPrimes.length && (firstPrimes[i] <= w); i++) {
        const p = firstPrimes[i];
        if (w === p)
            return true;
        else if (w % p === 0n)
            return false;
    }
    let a = 0n;
    const d = w - 1n;
    let aux = d;
    while (aux % 2n === 0n) {
        aux /= 2n;
        ++a;
    }
    const m = d / (2n ** a);
    do {
        const b = randBetween(d, 2n);
        let z = modPow(b, m, w);
        if (z === 1n || z === d)
            continue;
        let j = 1;
        while (j < a) {
            z = modPow(z, 2n, w);
            if (z === d)
                break;
            if (z === 1n)
                return false;
            j++;
        }
        if (z !== d)
            return false;
    } while (--iterations !== 0);
    return true;
}
function _isProbablyPrimeWorkerUrl() {
    let workerCode = `
  'use strict';
  const ${eGcd.name} = ${eGcd.toString()};
  const ${modInv.name} = ${modInv.toString()};
  const ${modPow.name} = ${modPow.toString()};
  const ${toZn.name} = ${toZn.toString()};
  const ${randBitsSync.name} = ${randBitsSync.toString()};
  const ${randBytesSync.name} = ${randBytesSync.toString()};
  const ${randBetween.name} = ${randBetween.toString()};
  const ${isProbablyPrime.name} = ${_isProbablyPrime.toString()};
  ${bitLength.toString()};
  ${fromBuffer.toString()};`;
    workerCode += `
  onmessage = async function(msg) {
    if (msg !== undefined && msg.data !== undefined && msg.data._bcu !== undefined && msg.data._bcu.id !== undefined && msg.data._bcu.iterations !== undefined && msg.data._bcu.rnd !== undefined) {
      const msgToParent = {
        _bcu: {
          isPrime: await ${isProbablyPrime.name}(msg.data._bcu.rnd, msg.data._bcu.iterations),
          value: msg.data._bcu.rnd,
          id: msg.data._bcu.id
        }
      };
      postMessage(msgToParent);
    }
  }`;
    return _workerUrl(workerCode);
}

function prime(bitLength, iterations = 16) {
    if (bitLength < 1)
        throw new RangeError('bitLength MUST be > 0');
    if (!_useWorkers) {
        let rnd = 0n;
        do {
            rnd = fromBuffer(randBitsSync(bitLength, true));
        } while (!_isProbablyPrime(rnd, iterations));
        return new Promise((resolve) => { resolve(rnd); });
    }
    return new Promise((resolve, reject) => {
        const workerList = [];
        const _onmessage = (msg, newWorker) => {
            if (msg._bcu.isPrime) {
                for (let j = 0; j < workerList.length; j++) {
                    workerList[j].terminate();
                }
                while (workerList.length > 0) {
                    workerList.pop();
                }
                resolve(msg._bcu.value);
            }
            else {
                const buf = randBitsSync(bitLength, true);
                const rnd = fromBuffer(buf);
                try {
                    const msgToWorker = {
                        _bcu: {
                            rnd,
                            iterations,
                            id: msg._bcu.id
                        }
                    };
                    newWorker.postMessage(msgToWorker);
                }
                catch (error) {
                }
            }
        };
        {
            const workerURL = _isProbablyPrimeWorkerUrl();
            for (let i = 0; i < self.navigator.hardwareConcurrency - 1; i++) {
                const newWorker = new Worker(workerURL);
                newWorker.onmessage = (event) => _onmessage(event.data, newWorker);
                workerList.push(newWorker);
            }
        }
        for (let i = 0; i < workerList.length; i++) {
            randBits(bitLength, true).then(function (buf) {
                const rnd = fromBuffer(buf);
                workerList[i].postMessage({
                    _bcu: {
                        rnd,
                        iterations,
                        id: i
                    }
                });
            }).catch(reject);
        }
    });
}
function primeSync(bitLength, iterations = 16) {
    if (bitLength < 1)
        throw new RangeError('bitLength MUST be > 0');
    let rnd = 0n;
    do {
        rnd = fromBuffer(randBitsSync(bitLength, true));
    } while (!_isProbablyPrime(rnd, iterations));
    return rnd;
}

export { abs, bitLength, eGcd, gcd, isProbablyPrime, lcm, max, min, modInv, modPow, prime, primeSync, randBetween, randBits, randBitsSync, randBytes, randBytesSync, toZn };
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