(function(){ | |
// Shortcuts | |
var C = Crypto, | |
util = C.util, | |
charenc = C.charenc, | |
UTF8 = charenc.UTF8, | |
Binary = charenc.Binary; | |
// Public API | |
var SHA1 = C.SHA1 = function (message, options) { | |
var digestbytes = util.wordsToBytes(SHA1._sha1(message)); | |
return options && options.asBytes ? digestbytes : | |
options && options.asString ? Binary.bytesToString(digestbytes) : | |
util.bytesToHex(digestbytes); | |
}; | |
// The core | |
SHA1._sha1 = 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, | |
w = [], | |
H0 = 1732584193, | |
H1 = -271733879, | |
H2 = -1732584194, | |
H3 = 271733878, | |
H4 = -1009589776; | |
// Padding | |
m[l >> 5] |= 0x80 << (24 - l % 32); | |
m[((l + 64 >>> 9) << 4) + 15] = l; | |
for (var i = 0; i < m.length; i += 16) { | |
var a = H0, | |
b = H1, | |
c = H2, | |
d = H3, | |
e = H4; | |
for (var j = 0; j < 80; j++) { | |
if (j < 16) w[j] = m[i + j]; | |
else { | |
var n = w[j-3] ^ w[j-8] ^ w[j-14] ^ w[j-16]; | |
w[j] = (n << 1) | (n >>> 31); | |
} | |
var t = ((H0 << 5) | (H0 >>> 27)) + H4 + (w[j] >>> 0) + ( | |
j < 20 ? (H1 & H2 | ~H1 & H3) + 1518500249 : | |
j < 40 ? (H1 ^ H2 ^ H3) + 1859775393 : | |
j < 60 ? (H1 & H2 | H1 & H3 | H2 & H3) - 1894007588 : | |
(H1 ^ H2 ^ H3) - 899497514); | |
H4 = H3; | |
H3 = H2; | |
H2 = (H1 << 30) | (H1 >>> 2); | |
H1 = H0; | |
H0 = t; | |
} | |
H0 += a; | |
H1 += b; | |
H2 += c; | |
H3 += d; | |
H4 += e; | |
} | |
return [H0, H1, H2, H3, H4]; | |
}; | |
// Package private blocksize | |
SHA1._blocksize = 16; | |
SHA1._digestsize = 20; | |
})(); |