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encryption.js
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2009-12-14
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11KB
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295 lines
var FIREFOUND_CRYPT = {
encrypt : function (msg, key) {
return btoa(this.cryptex.encrypt(msg, key, 128));
},
decrypt : function (cipher, key) {
return this.cryptex.decrypt(atob(cipher), key, 128);
},
cryptex : {
subBytes : function(s, Nb) {
for (var r=0; r<4; r++) {
for (var c=0; c<Nb; c++) s[r][c] = this.Sbox[s[r][c]];
}
return s;
},
shiftRows : function(s, Nb) {
var t = new Array(4);
for (var r=1; r<4; r++) {
for (var c=0; c<4; c++) t[c] = s[r][(c+r)%Nb]; // shift into temp copy
for (var c=0; c<4; c++) s[r][c] = t[c]; // and copy back
}
return s;
},
mixColumns : function(s, Nb) {
for (var c=0; c<4; c++) {
var a = new Array(4); // 'a' is a copy of the current column from 's'
var b = new Array(4); // 'b' is aΓÇó{02} in GF(2^8)
for (var i=0; i<4; i++) {
a[i] = s[i][c];
b[i] = s[i][c]&0x80 ? s[i][c]<<1 ^ 0x011b : s[i][c]<<1;
}
s[0][c] = b[0] ^ a[1] ^ b[1] ^ a[2] ^ a[3]; // 2*a0 + 3*a1 + a2 + a3
s[1][c] = a[0] ^ b[1] ^ a[2] ^ b[2] ^ a[3]; // a0 * 2*a1 + 3*a2 + a3
s[2][c] = a[0] ^ a[1] ^ b[2] ^ a[3] ^ b[3]; // a0 + a1 + 2*a2 + 3*a3
s[3][c] = a[0] ^ b[0] ^ a[1] ^ a[2] ^ b[3]; // 3*a0 + a1 + a2 + 2*a3
}
return s;
},
addRoundKey : function(state, w, rnd, Nb) { // xor Round Key into state S [§5.1.4]
for (var r=0; r<4; r++) {
for (var c=0; c<Nb; c++) state[r][c] ^= w[rnd*4+c][r];
}
return state;
},
subWord : function(w) {
for (var i=0; i<4; i++) w[i] = this.Sbox[w[i]];
return w;
},
rotWord : function(w) {
w[4] = w[0];
for (var i=0; i<4; i++) w[i] = w[i+1];
return w;
},
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],
Rcon : [ [0x00, 0x00, 0x00, 0x00],[0x01, 0x00, 0x00, 0x00],[0x02, 0x00, 0x00, 0x00],[0x04, 0x00, 0x00, 0x00],[0x08, 0x00, 0x00, 0x00],[0x10, 0x00, 0x00, 0x00],[0x20, 0x00, 0x00, 0x00],[0x40, 0x00, 0x00, 0x00],[0x80, 0x00, 0x00, 0x00],[0x1b, 0x00, 0x00, 0x00],[0x36, 0x00, 0x00, 0x00] ],
escCtrlChars : function(str) {
return str.replace(/[\0\t\n\v\f\r\xa0!-]/g, function(c) { return '!' + c.charCodeAt(0) + '!'; });
},
unescCtrlChars : function(str) {
return str.replace(/!\d\d?\d?!/g, function(c) { return String.fromCharCode(c.slice(1,-1)); });
},
cipher : function(input, w) {
var Nb = 4; // block size (in words): no of columns in state (fixed at 4 for AES)
var Nr = w.length/Nb - 1; // no of rounds: 10/12/14 for 128/192/256-bit keys
var state = [[],[],[],[]]; // initialise 4xNb byte-array 'state' with input [§3.4]
for (var i=0; i<4*Nb; i++) state[i%4][Math.floor(i/4)] = input[i];
state = this.addRoundKey(state, w, 0, Nb);
for (var round=1; round<Nr; round++) {
state = this.subBytes(state, Nb);
state = this.shiftRows(state, Nb);
state = this.mixColumns(state, Nb);
state = this.addRoundKey(state, w, round, Nb);
}
state = this.subBytes(state, Nb);
state = this.shiftRows(state, Nb);
state = this.addRoundKey(state, w, Nr, Nb);
var output = new Array(4*Nb); // convert state to 1-d array before returning [§3.4]
for (var i=0; i<4*Nb; i++) output[i] = state[i%4][Math.floor(i/4)];
return output;
},
keyExpansion : function(key) {
var Nb = 4; // block size (in words): no of columns in state (fixed at 4 for AES)
var Nk = key.length/4 // key length (in words): 4/6/8 for 128/192/256-bit keys
var Nr = Nk + 6; // no of rounds: 10/12/14 for 128/192/256-bit keys
var w = new Array(Nb*(Nr+1));
var temp = new Array(4);
for (var i=0; i<Nk; i++) {
var r = [key[4*i], key[4*i+1], key[4*i+2], key[4*i+3]];
w[i] = r;
}
for (var i=Nk; i<(Nb*(Nr+1)); i++) {
w[i] = new Array(4);
for (var t=0; t<4; t++) temp[t] = w[i-1][t];
if (i % Nk == 0) {
temp = this.subWord(this.rotWord(temp));
for (var t=0; t<4; t++) temp[t] ^= this.Rcon[i/Nk][t];
} else if (Nk > 6 && i%Nk == 4) {
temp = this.subWord(temp);
}
for (var t=0; t<4; t++) w[i][t] = w[i-Nk][t] ^ temp[t];
}
return w;
},
encrypt : function(plaintext, password, nBits) {
if (!(nBits==128 || nBits==192 || nBits==256)) return ''; // standard allows 128/192/256 bit keys
// for this example script, generate the key by applying cipher to 1st 16/24/32 chars of password;
// for real-world applications, a more secure approach would be to hash the password e.g. with SHA-1
var nBytes = nBits/8; // no bytes in key
/*
var pwBytes = new Array(nBytes);
for (var i=0; i<nBytes; i++) pwBytes[i] = password.charCodeAt(i) & 0xff;
var key = this.cipher(pwBytes, this.keyExpansion(pwBytes));
key = key.concat(key.slice(0, nBytes-16)); // key is now 16/24/32 bytes long
*/
// Key is a 16-count array of integers between 0 and 255
// We can achieve the same thing by sha1-hashing the password, getting the first 32 characters,
// and then converting each hex pair to decimal.
var hash = FIREFOUND_CRYPT.hash(password, "SHA1", true);
var key = [];
for (var i = 0; i < (nBytes * 2); i += 2) {
var hexNum = hash.substr(i, 2);
var decNum = parseInt(hexNum, 16);
key.push(decNum);
}
// initialise counter block (NIST SP800-38A §B.2): millisecond time-stamp for nonce in 1st 8 bytes,
// block counter in 2nd 8 bytes
var blockSize = 16; // block size fixed at 16 bytes / 128 bits (Nb=4) for AES
var counterBlock = new Array(blockSize); // block size fixed at 16 bytes / 128 bits (Nb=4) for AES
var nonce = Math.round((new Date()).getTime() / 1000); // seconds since 1-Jan-1970
// encode nonce in two stages to cater for JavaScript 32-bit limit on bitwise ops
for (var i=0; i<4; i++) counterBlock[i] = (nonce >>> i*8) & 0xff;
for (var i=0; i<4; i++) counterBlock[i+4] = (nonce/0x100000000 >>> i*8) & 0xff;
// generate key schedule - an expansion of the key into distinct Key Rounds for each round
var keySchedule = this.keyExpansion(key);
var blockCount = Math.ceil(plaintext.length/blockSize);
var ciphertext = new Array(blockCount); // ciphertext as array of strings
for (var b=0; b<blockCount; b++) {
// set counter (block #) in last 8 bytes of counter block (leaving nonce in 1st 8 bytes)
// again done in two stages for 32-bit ops
for (var c=0; c<4; c++) counterBlock[15-c] = (b >>> c*8) & 0xff;
for (var c=0; c<4; c++) counterBlock[15-c-4] = (b/0x100000000 >>> c*8)
var cipherCntr = this.cipher(counterBlock, keySchedule); // -- encrypt counter block --
// calculate length of final block:
var blockLength = b<blockCount-1 ? blockSize : (plaintext.length-1)%blockSize+1;
var ct = '';
for (var i=0; i<blockLength; i++) { // -- xor plaintext with ciphered counter byte-by-byte --
var plaintextByte = plaintext.charCodeAt(b*blockSize+i);
var cipherByte = plaintextByte ^ cipherCntr[i];
ct += String.fromCharCode(cipherByte);
}
// ct is now ciphertext for this block
ciphertext[b] = this.escCtrlChars(ct); // escape troublesome characters in ciphertext
}
// convert the nonce to a string to go on the front of the ciphertext
var ctrTxt = '';
for (var i=0; i<8; i++) ctrTxt += String.fromCharCode(counterBlock[i]);
ctrTxt = this.escCtrlChars(ctrTxt);
// use '-' to separate blocks, use Array.join to concatenate arrays of strings for efficiency
return ctrTxt + '-' + ciphertext.join('-');
},
decrypt : function(ciphertext, password, nBits) {
if (!(nBits==128 || nBits==192 || nBits==256)) return ''; // standard allows 128/192/256 bit keys
var nBytes = nBits/8; // no bytes in key
/*
var pwBytes = new Array(nBytes);
for (var i=0; i<nBytes; i++) pwBytes[i] = password.charCodeAt(i) & 0xff;
var pwKeySchedule = this.keyExpansion(pwBytes);
var key = this.cipher(pwBytes, pwKeySchedule);
key = key.concat(key.slice(0, nBytes-16)); // key is now 16/24/32 bytes long
*/
var hash = FIREFOUND_CRYPT.hash(password, "SHA1", true);
var key = [];
for (var i = 0; i < (nBytes * 2); i += 2) {
var hexNum = hash.substr(i, 2);
var decNum = parseInt(hexNum, 16);
key.push(decNum);
}
var keySchedule = this.keyExpansion(key);
ciphertext = ciphertext.split('-'); // split ciphertext into array of block-length strings
var blockSize = 16; // block size fixed at 16 bytes / 128 bits (Nb=4) for AES
var counterBlock = new Array(blockSize);
var ctrTxt = this.unescCtrlChars(ciphertext[0]);
for (var i=0; i<8; i++) counterBlock[i] = ctrTxt.charCodeAt(i);
var plaintext = new Array(ciphertext.length-1);
for (var b=1; b<ciphertext.length; b++) {
for (var c=0; c<4; c++) counterBlock[15-c] = ((b-1) >>> c*8) & 0xff;
for (var c=0; c<4; c++) counterBlock[15-c-4] = ((b/0x100000000-1) >>> c*8) & 0xff;
var cipherCntr = this.cipher(counterBlock, keySchedule); // encrypt counter block
ciphertext[b] = this.unescCtrlChars(ciphertext[b]);
var pt = '';
for (var i=0; i<ciphertext[b].length; i++) {
var ciphertextByte = ciphertext[b].charCodeAt(i);
var plaintextByte = ciphertextByte ^ cipherCntr[i];
pt += String.fromCharCode(plaintextByte);
}
plaintext[b-1] = pt; // b-1 'cos no initial nonce block in plaintext
}
return plaintext.join('');
}
},
hash : function(str, method, hex) {
var hash_engine;
try {
hash_engine = Components.classes["@mozilla.org/security/hash;1"].createInstance(Components.interfaces["nsICryptoHash"]);
hash_engine.initWithString(method);
var charcodes = new Array();
for (var i = 0; i < str.length; i++)
charcodes.push(str.charCodeAt(i));
hash_engine.update(charcodes, str.length);
if (hex) {
var hash = hash_engine.finish(false);
function toHexString(charCode) {
return ("0" + charCode.toString(16)).slice(-2);
}
// convert the binary hash data to a hex string.
var s = [toHexString(hash.charCodeAt(i)) for (i in hash)].join("");
return s;
}
else {
return hash_engine.finish(true);
}
}
catch (e) {
return null;
}
}
};