corrade-nucleus-nucleons – Blame information for rev 20

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20 office 1 (function(){
2  
3 var C = (typeof window === 'undefined') ? require('./Crypto').Crypto : window.Crypto;
4  
5 // Shortcuts
6 var util = C.util,
7 charenc = C.charenc,
8 UTF8 = charenc.UTF8,
9 Binary = charenc.Binary;
10  
11 C.PBKDF2 = function (password, salt, keylen, options) {
12  
13 // Convert to byte arrays
14 if (password.constructor == String) password = UTF8.stringToBytes(password);
15 if (salt.constructor == String) salt = UTF8.stringToBytes(salt);
16 /* else, assume byte arrays already */
17  
18 // Defaults
19 var hasher = options && options.hasher || C.SHA1,
20 iterations = options && options.iterations || 1;
21  
22 // Pseudo-random function
23 function PRF(password, salt) {
24 return C.HMAC(hasher, salt, password, { asBytes: true });
25 }
26  
27 // Generate key
28 var derivedKeyBytes = [],
29 blockindex = 1;
30 while (derivedKeyBytes.length < keylen) {
31 var block = PRF(password, salt.concat(util.wordsToBytes([blockindex])));
32 for (var u = block, i = 1; i < iterations; i++) {
33 u = PRF(password, u);
34 for (var j = 0; j < block.length; j++) block[j] ^= u[j];
35 }
36 derivedKeyBytes = derivedKeyBytes.concat(block);
37 blockindex++;
38 }
39  
40 // Truncate excess bytes
41 derivedKeyBytes.length = keylen;
42  
43 return options && options.asBytes ? derivedKeyBytes :
44 options && options.asString ? Binary.bytesToString(derivedKeyBytes) :
45 util.bytesToHex(derivedKeyBytes);
46  
47 };
48  
49 })();