supercop.wasm/src/index.js

orlp/ed25519 compiled to WebAssembly using Emscripten and optimized for small size

// Generated by LiveScript 1.5.0
/**
 * @package lib.wasm
 * @author  Nazar Mokrynskyi <nazar@mokrynskyi.com>
 * @license 0BSD
 */
(function(){
  var random_bytes;
  if (typeof crypto !== 'undefined') {
    /**
     * @param {number} size
     *
     * @return {!Uint8Array}
     */
    random_bytes = function(size){
      var array;
      array = new Uint8Array(size);
      crypto.getRandomValues(array);
      return array;
    };
  } else {
    /**
     * @param {string} size
     *
     * @return {!Uint8Array}
     */
    random_bytes = require('crypto').randomBytes;
  }
  function Wrapper(lib){
    var allocate, free;
    lib = lib();
    allocate = lib['allocateBytes'];
    free = lib['freeBytes'];
    /**
     * @return {!Uint8Array}
     */
    function createSeed(){
      return random_bytes(32);
    }
    /**
     * @param {!Uint8Array} seed
     *
     * @return {!Object}
     */
    function createKeyPair(seed){
      var publicKey, secretKey;
      if (!(seed instanceof Uint8Array)) {
        throw new Error('not Uint8Array!');
      }
      seed = allocate(0, seed);
      publicKey = allocate(32);
      secretKey = allocate(64);
      lib['_ed25519_create_keypair'](publicKey, secretKey, seed);
      publicKey = publicKey['get']();
      secretKey = secretKey['get']();
      free();
      return {
        publicKey: publicKey,
        secretKey: secretKey
      };
    }
    /**
     * @param {!Uint8Array} message
     * @param {!Uint8Array} publicKey
     * @param {!Uint8Array} secretKey
     *
     * @return {!Uint8Array}
     */
    function sign(message, publicKey, secretKey){
      var signature;
      if (!(message instanceof Uint8Array && publicKey instanceof Uint8Array && secretKey instanceof Uint8Array)) {
        throw new Error('not Uint8Arrays!');
      }
      message = allocate(0, message);
      publicKey = allocate(0, publicKey);
      secretKey = allocate(0, secretKey);
      signature = allocate(64);
      lib['_ed25519_sign'](signature, message, message.length, publicKey, secretKey);
      signature = signature['get']();
      free();
      return signature;
    }
    /**
     * @param {!Uint8Array} signature
     * @param {!Uint8Array} message
     * @param {!Uint8Array} publicKey
     *
     * @return {boolean}
     */
    function verify(signature, message, publicKey){
      var result;
      if (!(signature instanceof Uint8Array && message instanceof Uint8Array && publicKey instanceof Uint8Array)) {
        throw new Error('not Uint8Arrays!');
      }
      message = allocate(0, message);
      publicKey = allocate(0, publicKey);
      signature = allocate(0, signature);
      result = lib['_ed25519_verify'](signature, message, message.length, publicKey) === 1;
      free();
      return result;
    }
    return {
      'ready': lib['then'],
      'createSeed': createSeed,
      'createKeyPair': createKeyPair,
      'sign': sign,
      'verify': verify
    };
  }
  if (typeof define === 'function' && define['amd']) {
    define(['./supercop'], Wrapper);
  } else if (typeof exports === 'object') {
    module.exports = Wrapper(require('./supercop'));
  } else {
    this['supercop_wasm'] = Wrapper(this['__supercopwasm']);
  }
}).call(this);