CryptoJS为JavaScript提供了各种各样的加密算法

/* CryptoJS v3.1.2 code.google.com/p/crypto-js (c) 2009-2013 by Jeff Mott. All rights reserved. code.google.com/p/crypto-js/wiki/License */ /** * Cipher core components. */ CryptoJS.lib.Cipher || (function (undefined) { // Shortcuts var C = CryptoJS; var C_lib = C.lib; var Base = C_lib.Base; var WordArray = C_lib.WordArray; var BufferedBlockAlgorithm = C_lib.BufferedBlockAlgorithm; var C_enc = C.enc; var Utf8 = C_enc.Utf8; var Base64 = C_enc.Base64; var C_algo = C.algo; var EvpKDF = C_algo.EvpKDF; /** * Abstract base cipher template. * * @property {number} keySize This cipher's key size. Default: 4 (128 bits) * @property {number} ivSize This cipher's IV size. Default: 4 (128 bits) * @property {number} _ENC_XFORM_MODE A constant representing encryption mode. * @property {number} _DEC_XFORM_MODE A constant representing decryption mode. */ var Cipher = C_lib.Cipher = BufferedBlockAlgorithm.extend({ /** * Configuration options. * * @property {WordArray} iv The IV to use for this operation. */ cfg: Base.extend(), /** * Creates this cipher in encryption mode. * * @param {WordArray} key The key. * @param {Object} cfg (Optional) The configuration options to use for this operation. * * @return {Cipher} A cipher instance. * * @static * * @example * * var cipher = CryptoJS.algo.AES.createEncryptor(keyWordArray, { iv: ivWordArray }); */ createEncryptor: function (key, cfg) { return this.create(this._ENC_XFORM_MODE, key, cfg); }, /** * Creates this cipher in decryption mode. * * @param {WordArray} key The key. * @param {Object} cfg (Optional) The configuration options to use for this operation. * * @return {Cipher} A cipher instance. * * @static * * @example * * var cipher = CryptoJS.algo.AES.createDecryptor(keyWordArray, { iv: ivWordArray }); */ createDecryptor: function (key, cfg) { return this.create(this._DEC_XFORM_MODE, key, cfg); }, /** * Initializes a newly created cipher. * * @param {number} xformMode Either the encryption or decryption transormation mode constant. * @param {WordArray} key The key. * @param {Object} cfg (Optional) The configuration options to use for this operation. * * @example * * var cipher = CryptoJS.algo.AES.create(CryptoJS.algo.AES._ENC_XFORM_MODE, keyWordArray, { iv: ivWordArray }); */ init: function (xformMode, key, cfg) { // Apply config defaults this.cfg = this.cfg.extend(cfg); // Store transform mode and key this._xformMode = xformMode; this._key = key; // Set initial values this.reset(); }, /** * Resets this cipher to its initial state. * * @example * * cipher.reset(); */ reset: function () { // Reset data buffer BufferedBlockAlgorithm.reset.call(this); // Perform concrete-cipher logic this._doReset(); }, /** * Adds data to be encrypted or decrypted. * * @param {WordArray|string} dataUpdate The data to encrypt or decrypt. * * @return {WordArray} The data after processing. * * @example * * var encrypted = cipher.process('data'); * var encrypted = cipher.process(wordArray); */ process: function (dataUpdate) { // Append this._append(dataUpdate); // Process available blocks return this._process(); }, /** * Finalizes the encryption or decryption process. * Note that the finalize operation is effectively a destructive, read-once operation. * * @param {WordArray|string} dataUpdate The final data to encrypt or decrypt. * * @return {WordArray} The data after final processing. * * @example * * var encrypted = cipher.finalize(); * var encrypted = cipher.finalize('data'); * var encrypted = cipher.finalize(wordArray); */ finalize: function (dataUpdate) { // Final data update if (dataUpdate) { this._append(dataUpdate); } // Perform concrete-cipher logic var finalProcessedData = this._doFinalize(); return finalProcessedData; }, keySize: 128/32, ivSize: 128/32, _ENC_XFORM_MODE: 1, _DEC_XFORM_MODE: 2, /** * Creates shortcut functions to a cipher's object interface. * * @param {Cipher} cipher The cipher to create a helper for. * * @return {Object} An object with encrypt and decrypt shortcut functions. * * @static * * @example * * var AES = CryptoJS.lib.Cipher._createHelper(CryptoJS.algo.AES); */ _createHelper: (function () { function selectCipherStrategy(key) { if (typeof key == 'string') { return PasswordBasedCipher; } else { return SerializableCipher; } } return function (cipher) { return { encrypt: function (message, key, cfg) { return selectCipherStrategy(key).encrypt(cipher, message, key, cfg); }, decrypt: function (ciphertext, key, cfg) { return selectCipherStrategy(key).decrypt(cipher, ciphertext, key, cfg); } }; }; }()) }); /** * Abstract base stream cipher template. * * @property {number} blockSize The number of 32-bit words this cipher operates on. Default: 1 (32 bits) */ var StreamCipher = C_lib.StreamCipher = Cipher.extend({ _doFinalize: function () { // Process partial blocks var finalProcessedBlocks = this._process(!!'flush'); return finalProcessedBlocks; }, blockSize: 1 }); /** * Mode namespace. */ var C_mode = C.mode = {}; /** * Abstract base block cipher mode template. */ var BlockCipherMode = C_lib.BlockCipherMode = Base.extend({ /** * Creates this mode for encryption. * * @param {Cipher} cipher A block cipher instance. * @param {Array} iv The IV words. * * @static * * @example * * var mode = CryptoJS.mode.CBC.createEncryptor(cipher, iv.words); */ createEncryptor: function (cipher, iv) { return this.Encryptor.create(cipher, iv); }, /** * Creates this mode for decryption. * * @param {Cipher} cipher A block cipher instance. * @param {Array} iv The IV words. * * @static * * @example * * var mode = CryptoJS.mode.CBC.createDecryptor(cipher, iv.words); */ createDecryptor: function (cipher, iv) { return this.Decryptor.create(ciph