bigint-crypto-utils
Advanced tools
Utils for working with cryptography using native JS (stage 3) implementation of BigInt. It includes arbitrary precision modular arithmetics, cryptographically secure random numbers and strong probable prime generation/testing.
Utils for working with cryptography using native JS (stage 3) implementation of BigInt. It includes some extra functions to work with modular arithmetics along with secure random numbers and a fast strong probable prime generation/testing(parallelised multi-threaded Miller-Rabin primality test). It can be used by any Web Browser or webview supporting BigInt and with Node.js (>=10.4.0). In the latter case, for multi-threaded primality tests, you should use Node.js 11 or enable at runtime with node --experimental-worker with Node.js >=10.5.0.
The operations supported on BigInts are not constant time. BigInt can be therefore unsuitable for use in cryptography. Many platforms provide native support for cryptography, such as Web Cryptography API or Node.js Crypto.
bigint-crypto-utils is distributed for web browsers and/or webviews supporting BigInt as an ES6 module or an IIFE file; and for Node.js (>=10.4.0), as a CJS module.
bigint-crypto-utils can be imported to your project with npm:
npm install bigint-crypto-utils
NPM installation defaults to the ES6 module for browsers and the CJS one for Node.js.
For web browsers, you can also directly download the minimised version of the IIFE file or the ES6 module from GitHub.
With node js:
const bigintCryptoUtils = require('bigint-crypto-utils');
/* Stage 3 BigInts with value 666 can be declared as BigInt('666')
or the shorter new no-so-linter-friendly syntax 666n.
Notice that you can also pass a number, e.g. BigInt(666), but it is not
recommended since values over 2**53 - 1 won't be safe but no warning will
be raised.
*/
let a = BigInt('5');
let b = BigInt('2');
let n = BigInt('19');
console.log(bigintCryptoUtils.modPow(a, b, n)); // prints 6
console.log(bigintCryptoUtils.modInv(BigInt('2'), BigInt('5'))); // prints 3
console.log(bigintCryptoUtils.modInv(BigInt('3'), BigInt('5'))); // prints 2
// Generation of a probable prime of 2048 bits
const prime = await bigintCryptoUtils.prime(2048);
// Testing if a prime is a probable prime (Miller-Rabin)
if ( await bigintCryptoUtils.isProbablyPrime(prime) )
// code if is prime
// Get a cryptographically secure random number between 1 and 2**256 bits.
const rnd = bigintCryptoUtils.randBetween(BigInt(2) ** BigInt(256));
From a browser, you can just load the module in a html page as:
<script type="module">
import * as bigintCryptoUtils from 'bigint-utils-latest.browser.mod.min.js';
let a = BigInt('5');
let b = BigInt('2');
let n = BigInt('19');
console.log(bigintCryptoUtils.modPow(a, b, n)); // prints 6
console.log(bigintCryptoUtils.modInv(BigInt('2'), BigInt('5'))); // prints 3
console.log(bigintCryptoUtils.modInv(BigInt('3'), BigInt('5'))); // prints 2
(async function () {
// Generation of a probable prime of 2018 bits
const p = await bigintCryptoUtils.prime(2048);
// Testing if a prime is a probable prime (Miller-Rabin)
const isPrime = await bigintCryptoUtils.isProbablyPrime(p);
alert(p.toString() + '\nIs prime?\n' + isPrime);
// Get a cryptographically secure random number between 1 and 2**256 bits.
const rnd = await bigintCryptoUtils.randBetween(BigInt(2) ** BigInt(256));
alert(rnd);
})();
</script>
bigintAbsolute value. abs(a)==a if a>=0. abs(a)==-a if a<0
numberReturns the bitlength of a number
egcdReturnAn iterative implementation of the extended euclidean algorithm or extended greatest common divisor algorithm. Take positive integers a, b as input, and return a triple (g, x, y), such that ax + by = g = gcd(a, b).
bigintGreatest-common divisor of two integers based on the iterative binary algorithm.
PromiseThe test first tries if any of the first 250 small primes are a factor of the input number and then passes several iterations of Miller-Rabin Probabilistic Primality Test (FIPS 186-4 C.3.1)
bigintThe least common multiple computed as abs(a*b)/gcd(a,b)
bigintModular inverse.
bigintModular exponentiation a**b mod n
PromiseA probably-prime (Miller-Rabin), cryptographically-secure, random-number generator. The browser version uses web workers to parallelise prime look up. Therefore, it does not lock the UI main process, and it can be much faster (if several cores or cpu are available). The node version can also use worker_threads if they are available (enabled by default with Node 11 and and can be enabled at runtime executing node --experimental-worker with node >=10.5.0).
bigintReturns a cryptographically secure random integer between [min,max]
Buffer | Uint8ArraySecure random bits for both node and browsers. Node version uses crypto.randomFill() and browser one self.crypto.getRandomValues()
Buffer | Uint8ArraySecure random bytes for both node and browsers. Node version uses crypto.randomFill() and browser one self.crypto.getRandomValues()
bigintFinds the smallest positive element that is congruent to a in modulo n
ObjectA triple (g, x, y), such that ax + by = g = gcd(a, b).
bigintAbsolute value. abs(a)==a if a>=0. abs(a)==-a if a<0
Kind: global function
Returns: bigint - the absolute value of a
| Param | Type |
|---|---|
| a | number | bigint |
numberReturns the bitlength of a number
Kind: global function
Returns: number - - the bit length
| Param | Type |
|---|---|
| a | bigint |
egcdReturnAn iterative implementation of the extended euclidean algorithm or extended greatest common divisor algorithm. Take positive integers a, b as input, and return a triple (g, x, y), such that ax + by = g = gcd(a, b).
Kind: global function
| Param | Type |
|---|---|
| a | number | bigint |
| b | number | bigint |
bigintGreatest-common divisor of two integers based on the iterative binary algorithm.
Kind: global function
Returns: bigint - The greatest common divisor of a and b
| Param | Type |
|---|---|
| a | number | bigint |
| b | number | bigint |
PromiseThe test first tries if any of the first 250 small primes are a factor of the input number and then passes several iterations of Miller-Rabin Probabilistic Primality Test (FIPS 186-4 C.3.1)
Kind: global function
Returns: Promise - A promise that resolves to a boolean that is either true (a probably prime number) or false (definitely composite)
| Param | Type | Description |
|---|---|---|
| w | bigint | An integer to be tested for primality |
| iterations | number | The number of iterations for the primality test. The value shall be consistent with Table C.1, C.2 or C.3 |
bigintThe least common multiple computed as abs(a*b)/gcd(a,b)
Kind: global function
Returns: bigint - The least common multiple of a and b
| Param | Type |
|---|---|
| a | number | bigint |
| b | number | bigint |
bigintModular inverse.
Kind: global function
Returns: bigint - the inverse modulo n
| Param | Type | Description |
|---|---|---|
| a | number | bigint | The number to find an inverse for |
| n | number | bigint | The modulo |
bigintModular exponentiation a**b mod n
Kind: global function
Returns: bigint - a**b mod n
| Param | Type | Description |
|---|---|---|
| a | number | bigint | base |
| b | number | bigint | exponent |
| n | number | bigint | modulo |
PromiseA probably-prime (Miller-Rabin), cryptographically-secure, random-number generator. The browser version uses web workers to parallelise prime look up. Therefore, it does not lock the UI main process, and it can be much faster (if several cores or cpu are available). The node version can also use worker_threads if they are available (enabled by default with Node 11 and and can be enabled at runtime executing node --experimental-worker with node >=10.5.0).
Kind: global function
Returns: Promise - A promise that resolves to a bigint probable prime of bitLength bits
| Param | Type | Description |
|---|---|---|
| bitLength | number | The required bit length for the generated prime |
| iterations | number | The number of iterations for the Miller-Rabin Probabilistic Primality Test |
bigintReturns a cryptographically secure random integer between [min,max]
Kind: global function
Returns: bigint - A cryptographically secure random bigint between [min,max]
| Param | Type | Description |
|---|---|---|
| max | bigint | Returned value will be <= max |
| min | bigint | Returned value will be >= min |
Buffer | Uint8ArraySecure random bits for both node and browsers. Node version uses crypto.randomFill() and browser one self.crypto.getRandomValues()
Kind: global function
Returns: Buffer | Uint8Array - A Buffer/UInt8Array (Node.js/Browser) filled with cryptographically secure random bits
| Param | Type | Description |
|---|---|---|
| bitLength | number | The desired number of random bits |
| forceLength | boolean | If we want to force the output to have a specific bit length. It basically forces the msb to be 1 |
Buffer | Uint8ArraySecure random bytes for both node and browsers. Node version uses crypto.randomFill() and browser one self.crypto.getRandomValues()
Kind: global function
Returns: Buffer | Uint8Array - A Buffer/UInt8Array (Node.js/Browser) filled with cryptographically secure random bytes
| Param | Type | Description |
|---|---|---|
| byteLength | number | The desired number of random bytes |
| forceLength | boolean | If we want to force the output to have a bit length of 8*byteLength. It basically forces the msb to be 1 |
bigintFinds the smallest positive element that is congruent to a in modulo n
Kind: global function
Returns: bigint - The smallest positive representation of a in modulo n
| Param | Type | Description |
|---|---|---|
| a | number | bigint | An integer |
| n | number | bigint | The modulo |
ObjectA triple (g, x, y), such that ax + by = g = gcd(a, b).
Kind: global typedef
Properties
| Name | Type |
|---|---|
| g | bigint |
| x | bigint |
| y | bigint |
FAQs
Arbitrary precision modular arithmetic, cryptographically secure random numbers and strong probable prime generation/testing. It works in modern browsers, Angular, React, Node.js, etc. since it uses the native JS implementation of BigInt
The npm package bigint-crypto-utils receives a total of 53,993 weekly downloads. As such, bigint-crypto-utils popularity was classified as popular.
We found that bigint-crypto-utils demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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