(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; | |
d = c; | |
c = b; | |
b = a; | |
a = t1 + t2; | |
} | |
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; | |
})(); |