96 lines
4.2 KiB
Handlebars
96 lines
4.2 KiB
Handlebars
# bigint-crypto-utils
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Utils for working with cryptography using native JS ([ECMA-262](https://tc39.es/ecma262/#sec-bigint-objects)) implementation of BigInt. It includes some extra functions to work with modular arithmetics along with secure random numbers and a fast strong probable prime generator/tester (parallelised multi-threaded Miller-Rabin primality test). It can be used by any [Web Browser or webview supporting BigInt](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigInt#Browser_compatibility) and with Node.js (>=10.4.0). In the latter case, for multi-threaded primality tests, you should use Node.js v11 or newer or enable at runtime with `node --experimental-worker` with Node.js version >= 10.5.0 and < 11.
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> The operations supported on BigInts are not constant time. BigInt can be therefore **[unsuitable for use in cryptography](https://www.chosenplaintext.ca/articles/beginners-guide-constant-time-cryptography.html).** Many platforms provide native support for cryptography, such as [Web Cryptography API](https://w3c.github.io/webcrypto/) or [Node.js Crypto](https://nodejs.org/dist/latest/docs/api/crypto.html).
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## Installation
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bigint-crypto-utils is distributed for [web browsers and/or webviews supporting BigInt](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigInt#Browser_compatibility) as an ES6 module or an IIFE file; and for Node.js (>=10.4.0), as a CJS module.
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bigint-crypto-utils can be imported to your project with `npm`:
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```bash
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npm install bigint-crypto-utils
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```
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NPM installation defaults to the ES6 module for browsers and the CJS one for Node.js.
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For web browsers, you can also directly download the [IIFE file](https://raw.githubusercontent.com/juanelas/bigint-crypto-utils/master/dist/bigint-crypto-utils-latest.browser.js) or the [ES6 module](https://raw.githubusercontent.com/juanelas/bigint-crypto-utils/master/dist/bigint-crypto-utils-latest.browser.mod.min.js) from GitHub.
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## Usage examples
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### Node.js:
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```javascript
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const bigintCryptoUtils = require("bigint-crypto-utils");
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/* Stage 3 BigInts with value 666 can be declared as BigInt('666')
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or the shorter new no-so-linter-friendly syntax 666n.
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Notice that you can also pass a number, e.g. BigInt(666), but it is not
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recommended since values over 2**53 - 1 won't be safe but no warning will
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be raised.
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*/
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let a = BigInt("5");
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let b = BigInt("2");
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let n = BigInt("19");
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console.log(bigintCryptoUtils.modPow(a, b, n)); // prints 6
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console.log(bigintCryptoUtils.modInv(BigInt("2"), BigInt("5"))); // prints 3
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console.log(bigintCryptoUtils.modInv(BigInt("3"), BigInt("5"))); // prints 2
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// Generation of a probable prime of 2048 bits
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const prime = await bigintCryptoUtils.prime(2048);
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// Testing if a prime is a probable prime (Miller-Rabin)
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if (await bigintCryptoUtils.isProbablyPrime(prime))
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// code if is prime
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// Get a cryptographically secure random number between 1 and 2**256 bits.
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const rnd = bigintCryptoUtils.randBetween(BigInt(2) ** BigInt(256));
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```
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### Javascript native from a browser
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You can just load the module in a html page as:
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```html
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<script type="module">
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import * as bigintCryptoUtils from "bigint-utils-latest.browser.mod.min.js";
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let a = BigInt("5");
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let b = BigInt("2");
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let n = BigInt("19");
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console.log(bigintCryptoUtils.modPow(a, b, n)); // prints 6
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console.log(bigintCryptoUtils.modInv(BigInt("2"), BigInt("5"))); // prints 3
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console.log(bigintCryptoUtils.modInv(BigInt("3"), BigInt("5"))); // prints 2
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(async function() {
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// Generation of a probable prime of 2018 bits
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const p = await bigintCryptoUtils.prime(2048);
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// Testing if a prime is a probable prime (Miller-Rabin)
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const isPrime = await bigintCryptoUtils.isProbablyPrime(p);
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alert(p.toString() + "\nIs prime?\n" + isPrime);
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// Get a cryptographically secure random number between 1 and 2**256 bits.
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const rnd = bigintCryptoUtils.randBetween(BigInt(2) ** BigInt(256));
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alert(rnd);
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})();
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</script>
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```
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### TypeScript
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BigInt is currently [ECMA-262](https://tc39.es/ecma262/#sec-bigint-objects) and thus in order to use it with TypeScript you should set `lib` (and probably also `target` and `module`) to `esnext` in `tsconfig.json`.
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# bigint-crypto-utils JS Doc
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{{>main}}
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* * * |