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MergeToolPruned.html
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<!doctype html>
<html>
<head>
<script type="text/javascript">
if (typeof Crypto == "undefined" || !Crypto.util) {
(function () {
var base64map = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
// Global Crypto object
var Crypto = window.Crypto = {};
// Crypto utilities
var util = Crypto.util = {
// Bit-wise rotate left
rotl: function (n, b) {
return (n << b) | (n >>> (32 - b));
},
// Bit-wise rotate right
rotr: function (n, b) {
return (n << (32 - b)) | (n >>> b);
},
// Swap big-endian to little-endian and vice versa
endian: function (n) {
// If number given, swap endian
if (n.constructor == Number) {
return util.rotl(n, 8) & 0x00FF00FF |
util.rotl(n, 24) & 0xFF00FF00;
}
// Else, assume array and swap all items
for (var i = 0; i < n.length; i++)
n[i] = util.endian(n[i]);
return n;
},
// Generate an array of any length of random bytes
randomBytes: function (n) {
for (var bytes = []; n > 0; n--)
bytes.push(Math.floor(Math.random() * 256));
return bytes;
},
// Convert a byte array to big-endian 32-bit words
bytesToWords: function (bytes) {
for (var words = [], i = 0, b = 0; i < bytes.length; i++, b += 8)
words[b >>> 5] |= (bytes[i] & 0xFF) << (24 - b % 32);
return words;
},
// Convert big-endian 32-bit words to a byte array
wordsToBytes: function (words) {
for (var bytes = [], b = 0; b < words.length * 32; b += 8)
bytes.push((words[b >>> 5] >>> (24 - b % 32)) & 0xFF);
return bytes;
},
// Convert a byte array to a hex string
bytesToHex: function (bytes) {
for (var hex = [], i = 0; i < bytes.length; i++) {
hex.push((bytes[i] >>> 4).toString(16));
hex.push((bytes[i] & 0xF).toString(16));
}
return hex.join("");
},
// Convert a hex string to a byte array
hexToBytes: function (hex) {
for (var bytes = [], c = 0; c < hex.length; c += 2)
bytes.push(parseInt(hex.substr(c, 2), 16));
return bytes;
},
// Convert a byte array to a base-64 string
bytesToBase64: function (bytes) {
for (var base64 = [], i = 0; i < bytes.length; i += 3) {
var triplet = (bytes[i] << 16) | (bytes[i + 1] << 8) | bytes[i + 2];
for (var j = 0; j < 4; j++) {
if (i * 8 + j * 6 <= bytes.length * 8)
base64.push(base64map.charAt((triplet >>> 6 * (3 - j)) & 0x3F));
else base64.push("=");
}
}
return base64.join("");
},
// Convert a base-64 string to a byte array
base64ToBytes: function (base64) {
// Remove non-base-64 characters
base64 = base64.replace(/[^A-Z0-9+\/]/ig, "");
for (var bytes = [], i = 0, imod4 = 0; i < base64.length; imod4 = ++i % 4) {
if (imod4 == 0) continue;
bytes.push(((base64map.indexOf(base64.charAt(i - 1)) & (Math.pow(2, -2 * imod4 + 8) - 1)) << (imod4 * 2)) |
(base64map.indexOf(base64.charAt(i)) >>> (6 - imod4 * 2)));
}
return bytes;
}
};
// Crypto character encodings
var charenc = Crypto.charenc = {};
// UTF-8 encoding
var UTF8 = charenc.UTF8 = {
// Convert a string to a byte array
stringToBytes: function (str) {
return Binary.stringToBytes(unescape(encodeURIComponent(str)));
},
// Convert a byte array to a string
bytesToString: function (bytes) {
return decodeURIComponent(escape(Binary.bytesToString(bytes)));
}
};
// Binary encoding
var Binary = charenc.Binary = {
// Convert a string to a byte array
stringToBytes: function (str) {
for (var bytes = [], i = 0; i < str.length; i++)
bytes.push(str.charCodeAt(i) & 0xFF);
return bytes;
},
// Convert a byte array to a string
bytesToString: function (bytes) {
for (var str = [], i = 0; i < bytes.length; i++)
str.push(String.fromCharCode(bytes[i]));
return str.join("");
}
};
})();
}
</script>
<script type="text/javascript">
/*!
* Crypto-JS v2.5.4 SHA256.js
* http://code.google.com/p/crypto-js/
* Copyright (c) 2009-2013, Jeff Mott. All rights reserved.
* http://code.google.com/p/crypto-js/wiki/License
*/
(function () {
// Shortcuts
var C = Crypto,
util = C.util,
charenc = C.charenc,
UTF8 = charenc.UTF8,
Binary = charenc.Binary;
// Constants
var K = [0x428A2F98, 0x71374491, 0xB5C0FBCF, 0xE9B5DBA5,
0x3956C25B, 0x59F111F1, 0x923F82A4, 0xAB1C5ED5,
0xD807AA98, 0x12835B01, 0x243185BE, 0x550C7DC3,
0x72BE5D74, 0x80DEB1FE, 0x9BDC06A7, 0xC19BF174,
0xE49B69C1, 0xEFBE4786, 0x0FC19DC6, 0x240CA1CC,
0x2DE92C6F, 0x4A7484AA, 0x5CB0A9DC, 0x76F988DA,
0x983E5152, 0xA831C66D, 0xB00327C8, 0xBF597FC7,
0xC6E00BF3, 0xD5A79147, 0x06CA6351, 0x14292967,
0x27B70A85, 0x2E1B2138, 0x4D2C6DFC, 0x53380D13,
0x650A7354, 0x766A0ABB, 0x81C2C92E, 0x92722C85,
0xA2BFE8A1, 0xA81A664B, 0xC24B8B70, 0xC76C51A3,
0xD192E819, 0xD6990624, 0xF40E3585, 0x106AA070,
0x19A4C116, 0x1E376C08, 0x2748774C, 0x34B0BCB5,
0x391C0CB3, 0x4ED8AA4A, 0x5B9CCA4F, 0x682E6FF3,
0x748F82EE, 0x78A5636F, 0x84C87814, 0x8CC70208,
0x90BEFFFA, 0xA4506CEB, 0xBEF9A3F7, 0xC67178F2];
// Public API
var SHA256 = C.SHA256 = function (message, options) {
var digestbytes = util.wordsToBytes(SHA256._sha256(message));
return options && options.asBytes ? digestbytes :
options && options.asString ? Binary.bytesToString(digestbytes) :
util.bytesToHex(digestbytes);
};
// The core
SHA256._sha256 = function (message) {
// Convert to byte array
if (message.constructor == String) message = UTF8.stringToBytes(message);
/* else, assume byte array already */
var m = util.bytesToWords(message),
l = message.length * 8,
H = [0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A,
0x510E527F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19],
w = [],
a, b, c, d, e, f, g, h, i, j,
t1, t2;
// Padding
m[l >> 5] |= 0x80 << (24 - l % 32);
m[((l + 64 >> 9) << 4) + 15] = l;
for (var i = 0; i < m.length; i += 16) {
a = H[0];
b = H[1];
c = H[2];
d = H[3];
e = H[4];
f = H[5];
g = H[6];
h = H[7];
for (var j = 0; j < 64; j++) {
if (j < 16) w[j] = m[j + i];
else {
var gamma0x = w[j - 15],
gamma1x = w[j - 2],
gamma0 = ((gamma0x << 25) | (gamma0x >>> 7)) ^
((gamma0x << 14) | (gamma0x >>> 18)) ^
(gamma0x >>> 3),
gamma1 = ((gamma1x << 15) | (gamma1x >>> 17)) ^
((gamma1x << 13) | (gamma1x >>> 19)) ^
(gamma1x >>> 10);
w[j] = gamma0 + (w[j - 7] >>> 0) +
gamma1 + (w[j - 16] >>> 0);
}
var ch = e & f ^ ~e & g,
maj = a & b ^ a & c ^ b & c,
sigma0 = ((a << 30) | (a >>> 2)) ^
((a << 19) | (a >>> 13)) ^
((a << 10) | (a >>> 22)),
sigma1 = ((e << 26) | (e >>> 6)) ^
((e << 21) | (e >>> 11)) ^
((e << 7) | (e >>> 25));
t1 = (h >>> 0) + sigma1 + ch + (K[j]) + (w[j] >>> 0);
t2 = sigma0 + maj;
h = g;
g = f;
f = e;
e = (d + t1) >>> 0;
d = c;
c = b;
b = a;
a = (t1 + t2) >>> 0;
}
H[0] += a;
H[1] += b;
H[2] += c;
H[3] += d;
H[4] += e;
H[5] += f;
H[6] += g;
H[7] += h;
}
return H;
};
// Package private blocksize
SHA256._blocksize = 16;
SHA256._digestsize = 32;
})();
</script>
<script type="text/javascript">
/*!
* Crypto-JS v2.5.4 PBKDF2.js
* http://code.google.com/p/crypto-js/
* Copyright (c) 2009-2013, Jeff Mott. All rights reserved.
* http://code.google.com/p/crypto-js/wiki/License
*/
(function () {
// Shortcuts
var C = Crypto,
util = C.util,
charenc = C.charenc,
UTF8 = charenc.UTF8,
Binary = charenc.Binary;
C.PBKDF2 = function (password, salt, keylen, options) {
// Convert to byte arrays
if (password.constructor == String) password = UTF8.stringToBytes(password);
if (salt.constructor == String) salt = UTF8.stringToBytes(salt);
/* else, assume byte arrays already */
// Defaults
var hasher = options && options.hasher || C.SHA1,
iterations = options && options.iterations || 1;
// Pseudo-random function
function PRF(password, salt) {
return C.HMAC(hasher, salt, password, { asBytes: true });
}
// Generate key
var derivedKeyBytes = [],
blockindex = 1;
while (derivedKeyBytes.length < keylen) {
var block = PRF(password, salt.concat(util.wordsToBytes([blockindex])));
for (var u = block, i = 1; i < iterations; i++) {
u = PRF(password, u);
for (var j = 0; j < block.length; j++) block[j] ^= u[j];
}
derivedKeyBytes = derivedKeyBytes.concat(block);
blockindex++;
}
// Truncate excess bytes
derivedKeyBytes.length = keylen;
return options && options.asBytes ? derivedKeyBytes :
options && options.asString ? Binary.bytesToString(derivedKeyBytes) :
util.bytesToHex(derivedKeyBytes);
};
})();
</script>
<script type="text/javascript">
/*!
* Crypto-JS v2.5.4 HMAC.js
* http://code.google.com/p/crypto-js/
* Copyright (c) 2009-2013, Jeff Mott. All rights reserved.
* http://code.google.com/p/crypto-js/wiki/License
*/
(function () {
// Shortcuts
var C = Crypto,
util = C.util,
charenc = C.charenc,
UTF8 = charenc.UTF8,
Binary = charenc.Binary;
C.HMAC = function (hasher, message, key, options) {
// Convert to byte arrays
if (message.constructor == String) message = UTF8.stringToBytes(message);
if (key.constructor == String) key = UTF8.stringToBytes(key);
/* else, assume byte arrays already */
// Allow arbitrary length keys
if (key.length > hasher._blocksize * 4)
key = hasher(key, { asBytes: true });
// XOR keys with pad constants
var okey = key.slice(0),
ikey = key.slice(0);
for (var i = 0; i < hasher._blocksize * 4; i++) {
okey[i] ^= 0x5C;
ikey[i] ^= 0x36;
}
var hmacbytes = hasher(okey.concat(hasher(ikey.concat(message), { asBytes: true })), { asBytes: true });
return options && options.asBytes ? hmacbytes :
options && options.asString ? Binary.bytesToString(hmacbytes) :
util.bytesToHex(hmacbytes);
};
})();
</script>
<script type="text/javascript">
(function () {
// Shortcuts
var C = Crypto,
util = C.util,
charenc = C.charenc,
UTF8 = charenc.UTF8;
// Precomputed SBOX
var SBOX = [0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5,
0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,
0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0,
0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,
0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc,
0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a,
0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,
0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0,
0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,
0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b,
0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85,
0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,
0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5,
0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,
0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17,
0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88,
0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,
0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c,
0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,
0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9,
0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6,
0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,
0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e,
0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,
0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94,
0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68,
0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16];
// Compute inverse SBOX lookup table
for (var INVSBOX = [], i = 0; i < 256; i++) INVSBOX[SBOX[i]] = i;
// Compute multiplication in GF(2^8) lookup tables
var MULT2 = [],
MULT3 = [],
MULT9 = [],
MULTB = [],
MULTD = [],
MULTE = [];
function xtime(a, b) {
for (var result = 0, i = 0; i < 8; i++) {
if (b & 1) result ^= a;
var hiBitSet = a & 0x80;
a = (a << 1) & 0xFF;
if (hiBitSet) a ^= 0x1b;
b >>>= 1;
}
return result;
}
for (var i = 0; i < 256; i++) {
MULT2[i] = xtime(i, 2);
MULT3[i] = xtime(i, 3);
MULT9[i] = xtime(i, 9);
MULTB[i] = xtime(i, 0xB);
MULTD[i] = xtime(i, 0xD);
MULTE[i] = xtime(i, 0xE);
}
// Precomputed RCon lookup
var RCON = [0x00, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36];
// Inner state
var state = [[], [], [], []],
keylength,
nrounds,
keyschedule;
var AES = C.AES = {
/**
* Public API
*/
encrypt: function (message, password, options) {
options = options || {};
// Determine mode
var mode = options.mode || new C.mode.OFB;
// Allow mode to override options
if (mode.fixOptions) mode.fixOptions(options);
var
// Convert to bytes if message is a string
m = (
message.constructor == String ?
UTF8.stringToBytes(message) :
message
),
// Generate random IV
iv = options.iv || util.randomBytes(AES._blocksize * 4),
// Generate key
k = (
password.constructor == String ?
// Derive key from pass-phrase
C.PBKDF2(password, iv, 32, { asBytes: true }) :
// else, assume byte array representing cryptographic key
password
);
// Encrypt
AES._init(k);
mode.encrypt(AES, m, iv);
// Return ciphertext
m = options.iv ? m : iv.concat(m);
return (options && options.asBytes) ? m : util.bytesToBase64(m);
},
decrypt: function (ciphertext, password, options) {
options = options || {};
// Determine mode
var mode = options.mode || new C.mode.OFB;
// Allow mode to override options
if (mode.fixOptions) mode.fixOptions(options);
var
// Convert to bytes if ciphertext is a string
c = (
ciphertext.constructor == String ?
util.base64ToBytes(ciphertext) :
ciphertext
),
// Separate IV and message
iv = options.iv || c.splice(0, AES._blocksize * 4),
// Generate key
k = (
password.constructor == String ?
// Derive key from pass-phrase
C.PBKDF2(password, iv, 32, { asBytes: true }) :
// else, assume byte array representing cryptographic key
password
);
// Decrypt
AES._init(k);
mode.decrypt(AES, c, iv);
// Return plaintext
return (options && options.asBytes) ? c : UTF8.bytesToString(c);
},
/**
* Package private methods and properties
*/
_blocksize: 4,
_encryptblock: function (m, offset) {
// Set input
for (var row = 0; row < AES._blocksize; row++) {
for (var col = 0; col < 4; col++)
state[row][col] = m[offset + col * 4 + row];
}
// Add round key
for (var row = 0; row < 4; row++) {
for (var col = 0; col < 4; col++)
state[row][col] ^= keyschedule[col][row];
}
for (var round = 1; round < nrounds; round++) {
// Sub bytes
for (var row = 0; row < 4; row++) {
for (var col = 0; col < 4; col++)
state[row][col] = SBOX[state[row][col]];
}
// Shift rows
state[1].push(state[1].shift());
state[2].push(state[2].shift());
state[2].push(state[2].shift());
state[3].unshift(state[3].pop());
// Mix columns
for (var col = 0; col < 4; col++) {
var s0 = state[0][col],
s1 = state[1][col],
s2 = state[2][col],
s3 = state[3][col];
state[0][col] = MULT2[s0] ^ MULT3[s1] ^ s2 ^ s3;
state[1][col] = s0 ^ MULT2[s1] ^ MULT3[s2] ^ s3;
state[2][col] = s0 ^ s1 ^ MULT2[s2] ^ MULT3[s3];
state[3][col] = MULT3[s0] ^ s1 ^ s2 ^ MULT2[s3];
}
// Add round key
for (var row = 0; row < 4; row++) {
for (var col = 0; col < 4; col++)
state[row][col] ^= keyschedule[round * 4 + col][row];
}
}
// Sub bytes
for (var row = 0; row < 4; row++) {
for (var col = 0; col < 4; col++)
state[row][col] = SBOX[state[row][col]];
}
// Shift rows
state[1].push(state[1].shift());
state[2].push(state[2].shift());
state[2].push(state[2].shift());
state[3].unshift(state[3].pop());
// Add round key
for (var row = 0; row < 4; row++) {
for (var col = 0; col < 4; col++)
state[row][col] ^= keyschedule[nrounds * 4 + col][row];
}
// Set output
for (var row = 0; row < AES._blocksize; row++) {
for (var col = 0; col < 4; col++)
m[offset + col * 4 + row] = state[row][col];
}
},
_decryptblock: function (c, offset) {
// Set input
for (var row = 0; row < AES._blocksize; row++) {
for (var col = 0; col < 4; col++)
state[row][col] = c[offset + col * 4 + row];
}
// Add round key
for (var row = 0; row < 4; row++) {
for (var col = 0; col < 4; col++)
state[row][col] ^= keyschedule[nrounds * 4 + col][row];
}
for (var round = 1; round < nrounds; round++) {
// Inv shift rows
state[1].unshift(state[1].pop());
state[2].push(state[2].shift());
state[2].push(state[2].shift());
state[3].push(state[3].shift());
// Inv sub bytes
for (var row = 0; row < 4; row++) {
for (var col = 0; col < 4; col++)
state[row][col] = INVSBOX[state[row][col]];
}
// Add round key
for (var row = 0; row < 4; row++) {
for (var col = 0; col < 4; col++)
state[row][col] ^= keyschedule[(nrounds - round) * 4 + col][row];
}
// Inv mix columns
for (var col = 0; col < 4; col++) {
var s0 = state[0][col],
s1 = state[1][col],
s2 = state[2][col],
s3 = state[3][col];
state[0][col] = MULTE[s0] ^ MULTB[s1] ^ MULTD[s2] ^ MULT9[s3];
state[1][col] = MULT9[s0] ^ MULTE[s1] ^ MULTB[s2] ^ MULTD[s3];
state[2][col] = MULTD[s0] ^ MULT9[s1] ^ MULTE[s2] ^ MULTB[s3];
state[3][col] = MULTB[s0] ^ MULTD[s1] ^ MULT9[s2] ^ MULTE[s3];
}
}
// Inv shift rows
state[1].unshift(state[1].pop());
state[2].push(state[2].shift());
state[2].push(state[2].shift());
state[3].push(state[3].shift());
// Inv sub bytes
for (var row = 0; row < 4; row++) {
for (var col = 0; col < 4; col++)
state[row][col] = INVSBOX[state[row][col]];
}
// Add round key
for (var row = 0; row < 4; row++) {
for (var col = 0; col < 4; col++)
state[row][col] ^= keyschedule[col][row];
}
// Set output
for (var row = 0; row < AES._blocksize; row++) {
for (var col = 0; col < 4; col++)
c[offset + col * 4 + row] = state[row][col];
}
},
/**
* Private methods
*/
_init: function (k) {
keylength = k.length / 4;
nrounds = keylength + 6;
AES._keyexpansion(k);
},
// Generate a key schedule
_keyexpansion: function (k) {
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]
];
}
}
};
})();
</script>
<script type="text/javascript">
/*!
* Crypto-JS 2.5.4 BlockModes.js
* contribution from Simon Greatrix
*/
(function (C) {
// Create pad namespace
var C_pad = C.pad = {};
// Calculate the number of padding bytes required.
function _requiredPadding(cipher, message) {
var blockSizeInBytes = cipher._blocksize * 4;
var reqd = blockSizeInBytes - message.length % blockSizeInBytes;
return reqd;
}
// Remove padding when the final byte gives the number of padding bytes.
var _unpadLength = function (cipher, message, alg, padding) {
var pad = message.pop();
if (pad == 0) {
throw new Error("Invalid zero-length padding specified for " + alg
+ ". Wrong cipher specification or key used?");
}
var maxPad = cipher._blocksize * 4;
if (pad > maxPad) {
throw new Error("Invalid padding length of " + pad
+ " specified for " + alg
+ ". Wrong cipher specification or key used?");
}
for (var i = 1; i < pad; i++) {
var b = message.pop();
if (padding != undefined && padding != b) {
throw new Error("Invalid padding byte of 0x" + b.toString(16)
+ " specified for " + alg
+ ". Wrong cipher specification or key used?");
}
}
};
// No-operation padding, used for stream ciphers
C_pad.NoPadding = {
pad: function (cipher, message) { },
unpad: function (cipher, message) { }
};
// Zero Padding.
//
// If the message is not an exact number of blocks, the final block is
// completed with 0x00 bytes. There is no unpadding.
C_pad.ZeroPadding = {
pad: function (cipher, message) {
var blockSizeInBytes = cipher._blocksize * 4;
var reqd = message.length % blockSizeInBytes;
if (reqd != 0) {
for (reqd = blockSizeInBytes - reqd; reqd > 0; reqd--) {
message.push(0x00);
}
}
},
unpad: function (cipher, message) {
while (message[message.length - 1] == 0) {
message.pop();
}
}
};
// ISO/IEC 7816-4 padding.
//
// Pads the plain text with an 0x80 byte followed by as many 0x00
// bytes are required to complete the block.
C_pad.iso7816 = {
pad: function (cipher, message) {
var reqd = _requiredPadding(cipher, message);
message.push(0x80);
for (; reqd > 1; reqd--) {
message.push(0x00);
}
},
unpad: function (cipher, message) {
var padLength;
for (padLength = cipher._blocksize * 4; padLength > 0; padLength--) {
var b = message.pop();
if (b == 0x80) return;
if (b != 0x00) {
throw new Error("ISO-7816 padding byte must be 0, not 0x" + b.toString(16) + ". Wrong cipher specification or key used?");
}
}
throw new Error("ISO-7816 padded beyond cipher block size. Wrong cipher specification or key used?");
}
};
// ANSI X.923 padding
//
// The final block is padded with zeros except for the last byte of the
// last block which contains the number of padding bytes.
C_pad.ansix923 = {
pad: function (cipher, message) {
var reqd = _requiredPadding(cipher, message);
for (var i = 1; i < reqd; i++) {
message.push(0x00);
}
message.push(reqd);
},
unpad: function (cipher, message) {
_unpadLength(cipher, message, "ANSI X.923", 0);
}
};
// ISO 10126
//
// The final block is padded with random bytes except for the last
// byte of the last block which contains the number of padding bytes.
C_pad.iso10126 = {
pad: function (cipher, message) {
var reqd = _requiredPadding(cipher, message);
for (var i = 1; i < reqd; i++) {
message.push(Math.floor(Math.random() * 256));
}
message.push(reqd);
},
unpad: function (cipher, message) {
_unpadLength(cipher, message, "ISO 10126", undefined);
}
};
// PKCS7 padding
//
// PKCS7 is described in RFC 5652. Padding is in whole bytes. The
// value of each added byte is the number of bytes that are added,
// i.e. N bytes, each of value N are added.
C_pad.pkcs7 = {
pad: function (cipher, message) {
var reqd = _requiredPadding(cipher, message);
for (var i = 0; i < reqd; i++) {
message.push(reqd);
}
},
unpad: function (cipher, message) {
_unpadLength(cipher, message, "PKCS 7", message[message.length - 1]);
}
};
// Create mode namespace
var C_mode = C.mode = {};
/**
* Mode base "class".
*/
var Mode = C_mode.Mode = function (padding) {
if (padding) {
this._padding = padding;
}
};
Mode.prototype = {
encrypt: function (cipher, m, iv) {
this._padding.pad(cipher, m);
this._doEncrypt(cipher, m, iv);
},
decrypt: function (cipher, m, iv) {
this._doDecrypt(cipher, m, iv);
this._padding.unpad(cipher, m);
},
// Default padding
_padding: C_pad.iso7816
};
/**
* Electronic Code Book mode.
*
* ECB applies the cipher directly against each block of the input.
*
* ECB does not require an initialization vector.
*/
var ECB = C_mode.ECB = function () {
// Call parent constructor
Mode.apply(this, arguments);
};
// Inherit from Mode
var ECB_prototype = ECB.prototype = new Mode;
// Concrete steps for Mode template
ECB_prototype._doEncrypt = function (cipher, m, iv) {
var blockSizeInBytes = cipher._blocksize * 4;
// Encrypt each block
for (var offset = 0; offset < m.length; offset += blockSizeInBytes) {
cipher._encryptblock(m, offset);
}
};
ECB_prototype._doDecrypt = function (cipher, c, iv) {
var blockSizeInBytes = cipher._blocksize * 4;
// Decrypt each block
for (var offset = 0; offset < c.length; offset += blockSizeInBytes) {
cipher._decryptblock(c, offset);
}
};