407 lines
10 KiB
JavaScript
407 lines
10 KiB
JavaScript
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/*!
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* Crypto-JS v2.5.4 AES.js
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* http://code.google.com/p/crypto-js/
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* Copyright (c) 2009-2013, Jeff Mott. All rights reserved.
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* http://code.google.com/p/crypto-js/wiki/License
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*/
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(function () {
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// Shortcuts
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var C = Crypto,
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util = C.util,
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charenc = C.charenc,
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UTF8 = charenc.UTF8;
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// Precomputed SBOX
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var SBOX = [0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5,
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0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,
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0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0,
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0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,
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0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc,
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0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
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0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a,
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0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,
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0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0,
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0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,
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0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b,
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0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
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0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85,
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0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,
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0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5,
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0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,
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0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17,
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0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
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0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88,
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0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,
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0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c,
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0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,
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0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9,
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0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
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0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6,
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0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,
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0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e,
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0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,
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0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94,
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0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
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0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68,
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0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16];
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// Compute inverse SBOX lookup table
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for (var INVSBOX = [], i = 0; i < 256; i++) INVSBOX[SBOX[i]] = i;
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// Compute multiplication in GF(2^8) lookup tables
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var MULT2 = [],
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MULT3 = [],
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MULT9 = [],
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MULTB = [],
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MULTD = [],
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MULTE = [];
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function xtime(a, b) {
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for (var result = 0, i = 0; i < 8; i++) {
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if (b & 1) result ^= a;
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var hiBitSet = a & 0x80;
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a = (a << 1) & 0xFF;
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if (hiBitSet) a ^= 0x1b;
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b >>>= 1;
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}
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return result;
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}
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for (var i = 0; i < 256; i++) {
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MULT2[i] = xtime(i, 2);
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MULT3[i] = xtime(i, 3);
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MULT9[i] = xtime(i, 9);
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MULTB[i] = xtime(i, 0xB);
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MULTD[i] = xtime(i, 0xD);
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MULTE[i] = xtime(i, 0xE);
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}
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// Precomputed RCon lookup
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var RCON = [0x00, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36];
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// Inner state
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var state = [[], [], [], []],
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keylength,
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nrounds,
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keyschedule;
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var AES = C.AES = {
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/**
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* Public API
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*/
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encrypt: function (message, password, options) {
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options = options || {};
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// Determine mode
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var mode = options.mode || new C.mode.OFB;
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// Allow mode to override options
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if (mode.fixOptions) mode.fixOptions(options);
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var
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// Convert to bytes if message is a string
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m = (
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message.constructor == String ?
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UTF8.stringToBytes(message) :
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message
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),
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// Generate random IV
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iv = options.iv || util.randomBytes(AES._blocksize * 4),
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// Generate key
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k = (
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password.constructor == String ?
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// Derive key from pass-phrase
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C.PBKDF2(password, iv, 32, { asBytes: true }) :
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// else, assume byte array representing cryptographic key
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password
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);
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// Encrypt
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AES._init(k);
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mode.encrypt(AES, m, iv);
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// Return ciphertext
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m = options.iv ? m : iv.concat(m);
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return (options && options.asBytes) ? m : util.bytesToBase64(m);
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},
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decrypt: function (ciphertext, password, options) {
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options = options || {};
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// Determine mode
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var mode = options.mode || new C.mode.OFB;
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// Allow mode to override options
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if (mode.fixOptions) mode.fixOptions(options);
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var
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// Convert to bytes if ciphertext is a string
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c = (
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ciphertext.constructor == String ?
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util.base64ToBytes(ciphertext) :
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ciphertext
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),
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// Separate IV and message
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iv = options.iv || c.splice(0, AES._blocksize * 4),
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// Generate key
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k = (
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password.constructor == String ?
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// Derive key from pass-phrase
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C.PBKDF2(password, iv, 32, { asBytes: true }) :
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// else, assume byte array representing cryptographic key
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password
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);
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// Decrypt
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AES._init(k);
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mode.decrypt(AES, c, iv);
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// Return plaintext
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return (options && options.asBytes) ? c : UTF8.bytesToString(c);
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},
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/**
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* Package private methods and properties
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*/
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_blocksize: 4,
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_encryptblock: function (m, offset) {
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// Set input
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for (var row = 0; row < AES._blocksize; row++) {
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for (var col = 0; col < 4; col++)
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state[row][col] = m[offset + col * 4 + row];
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}
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// Add round key
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for (var row = 0; row < 4; row++) {
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for (var col = 0; col < 4; col++)
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state[row][col] ^= keyschedule[col][row];
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}
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for (var round = 1; round < nrounds; round++) {
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// Sub bytes
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for (var row = 0; row < 4; row++) {
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for (var col = 0; col < 4; col++)
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state[row][col] = SBOX[state[row][col]];
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}
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// Shift rows
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state[1].push(state[1].shift());
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state[2].push(state[2].shift());
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state[2].push(state[2].shift());
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state[3].unshift(state[3].pop());
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// Mix columns
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for (var col = 0; col < 4; col++) {
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var s0 = state[0][col],
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s1 = state[1][col],
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s2 = state[2][col],
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s3 = state[3][col];
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state[0][col] = MULT2[s0] ^ MULT3[s1] ^ s2 ^ s3;
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state[1][col] = s0 ^ MULT2[s1] ^ MULT3[s2] ^ s3;
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state[2][col] = s0 ^ s1 ^ MULT2[s2] ^ MULT3[s3];
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state[3][col] = MULT3[s0] ^ s1 ^ s2 ^ MULT2[s3];
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}
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// Add round key
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for (var row = 0; row < 4; row++) {
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for (var col = 0; col < 4; col++)
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state[row][col] ^= keyschedule[round * 4 + col][row];
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}
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}
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// Sub bytes
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for (var row = 0; row < 4; row++) {
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for (var col = 0; col < 4; col++)
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state[row][col] = SBOX[state[row][col]];
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}
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// Shift rows
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state[1].push(state[1].shift());
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state[2].push(state[2].shift());
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state[2].push(state[2].shift());
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state[3].unshift(state[3].pop());
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// Add round key
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for (var row = 0; row < 4; row++) {
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for (var col = 0; col < 4; col++)
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state[row][col] ^= keyschedule[nrounds * 4 + col][row];
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}
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// Set output
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for (var row = 0; row < AES._blocksize; row++) {
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for (var col = 0; col < 4; col++)
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m[offset + col * 4 + row] = state[row][col];
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}
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},
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_decryptblock: function (c, offset) {
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// Set input
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for (var row = 0; row < AES._blocksize; row++) {
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for (var col = 0; col < 4; col++)
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state[row][col] = c[offset + col * 4 + row];
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}
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// Add round key
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for (var row = 0; row < 4; row++) {
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for (var col = 0; col < 4; col++)
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state[row][col] ^= keyschedule[nrounds * 4 + col][row];
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}
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for (var round = 1; round < nrounds; round++) {
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// Inv shift rows
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state[1].unshift(state[1].pop());
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state[2].push(state[2].shift());
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state[2].push(state[2].shift());
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state[3].push(state[3].shift());
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// Inv sub bytes
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for (var row = 0; row < 4; row++) {
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for (var col = 0; col < 4; col++)
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state[row][col] = INVSBOX[state[row][col]];
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}
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// Add round key
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for (var row = 0; row < 4; row++) {
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for (var col = 0; col < 4; col++)
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state[row][col] ^= keyschedule[(nrounds - round) * 4 + col][row];
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}
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// Inv mix columns
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for (var col = 0; col < 4; col++) {
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var s0 = state[0][col],
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s1 = state[1][col],
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s2 = state[2][col],
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s3 = state[3][col];
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state[0][col] = MULTE[s0] ^ MULTB[s1] ^ MULTD[s2] ^ MULT9[s3];
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state[1][col] = MULT9[s0] ^ MULTE[s1] ^ MULTB[s2] ^ MULTD[s3];
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state[2][col] = MULTD[s0] ^ MULT9[s1] ^ MULTE[s2] ^ MULTB[s3];
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state[3][col] = MULTB[s0] ^ MULTD[s1] ^ MULT9[s2] ^ MULTE[s3];
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}
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}
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// Inv shift rows
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state[1].unshift(state[1].pop());
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state[2].push(state[2].shift());
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state[2].push(state[2].shift());
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state[3].push(state[3].shift());
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// Inv sub bytes
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for (var row = 0; row < 4; row++) {
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for (var col = 0; col < 4; col++)
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state[row][col] = INVSBOX[state[row][col]];
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}
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// Add round key
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for (var row = 0; row < 4; row++) {
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for (var col = 0; col < 4; col++)
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state[row][col] ^= keyschedule[col][row];
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}
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// Set output
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for (var row = 0; row < AES._blocksize; row++) {
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for (var col = 0; col < 4; col++)
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c[offset + col * 4 + row] = state[row][col];
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}
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},
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/**
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* Private methods
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*/
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_init: function (k) {
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keylength = k.length / 4;
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nrounds = keylength + 6;
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AES._keyexpansion(k);
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},
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// Generate a key schedule
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_keyexpansion: function (k) {
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keyschedule = [];
|
||
|
|
|
||
|
|
for (var row = 0; row < keylength; row++) {
|
||
|
|
keyschedule[row] = [
|
||
|
|
k[row * 4],
|
||
|
|
k[row * 4 + 1],
|
||
|
|
k[row * 4 + 2],
|
||
|
|
k[row * 4 + 3]
|
||
|
|
];
|
||
|
|
}
|
||
|
|
|
||
|
|
for (var row = keylength; row < AES._blocksize * (nrounds + 1); row++) {
|
||
|
|
|
||
|
|
var temp = [
|
||
|
|
keyschedule[row - 1][0],
|
||
|
|
keyschedule[row - 1][1],
|
||
|
|
keyschedule[row - 1][2],
|
||
|
|
keyschedule[row - 1][3]
|
||
|
|
];
|
||
|
|
|
||
|
|
if (row % keylength == 0) {
|
||
|
|
|
||
|
|
// Rot word
|
||
|
|
temp.push(temp.shift());
|
||
|
|
|
||
|
|
// Sub word
|
||
|
|
temp[0] = SBOX[temp[0]];
|
||
|
|
temp[1] = SBOX[temp[1]];
|
||
|
|
temp[2] = SBOX[temp[2]];
|
||
|
|
temp[3] = SBOX[temp[3]];
|
||
|
|
|
||
|
|
temp[0] ^= RCON[row / keylength];
|
||
|
|
|
||
|
|
} else if (keylength > 6 && row % keylength == 4) {
|
||
|
|
|
||
|
|
// Sub word
|
||
|
|
temp[0] = SBOX[temp[0]];
|
||
|
|
temp[1] = SBOX[temp[1]];
|
||
|
|
temp[2] = SBOX[temp[2]];
|
||
|
|
temp[3] = SBOX[temp[3]];
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
keyschedule[row] = [
|
||
|
|
keyschedule[row - keylength][0] ^ temp[0],
|
||
|
|
keyschedule[row - keylength][1] ^ temp[1],
|
||
|
|
keyschedule[row - keylength][2] ^ temp[2],
|
||
|
|
keyschedule[row - keylength][3] ^ temp[3]
|
||
|
|
];
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
};
|
||
|
|
|
||
|
|
})();
|