/*//////////////////////////////////////////////////////////////////////////
* THIS PROGRAM IS A DERIVATIVE OF AN EXISTING WORK :: 27 August 2010
* See: http://anmar.eu.org/projects/jssha2/
*
* Significant but mostly superficial changes have been made to the structure of the
* source so that it conforms to the Joose v3 object system for JavaScript
* See: http://joose.it/
/*//////////////////////////////////////////////////////////////////////////
Class('Hash.SHA256', {
/*VERSION*/VERSION : 0.01,
my : {
has : {
chrsz : {
is : 'ro',
init : 8
},
upper_case : {
is : 'rw',
init : false
}
},
methods : {
safe_add : function (x, y) {
var lsw = (x & 0xFFFF) + (y & 0xFFFF)
var msw = (x >> 16) + (y >> 16) + (lsw >> 16)
return (msw << 16) | (lsw & 0xFFFF)
},
S : function (X, n) {
return (X >>> n) | (X << (32 - n))
},
R : function (X, n) {
return (X >>> n)
},
Ch : function (x, y, z) {
return ((x & y) ^ ((~x) & z))
},
Maj : function (x, y, z) {
return ((x & y) ^ (x & z) ^ (y & z))
},
Sigma0256 : function (x) {
return (this.S(x, 2) ^ this.S(x, 13) ^ this.S(x, 22))
},
Sigma1256 : function (x) {
return (this.S(x, 6) ^ this.S(x, 11) ^ this.S(x, 25))
},
Gamma0256 : function (x) {
return (this.S(x, 7) ^ this.S(x, 18) ^ this.R(x, 3))
},
Gamma1256 : function (x) {
return (this.S(x, 17) ^ this.S(x, 19) ^ this.R(x, 10))
},
core_sha256 : function (m, l) {
var K = new Array(0x428A2F98, 0x71374491, 0xB5C0FBCF, 0xE9B5DBA5, 0x3956C25B, 0x59F111F1, 0x923F82A4, 0xAB1C5ED5, 0xD807AA98, 0x12835B01, 0x243185BE, 0x550C7DC3, 0x72BE5D74, 0x80DEB1FE, 0x9BDC06A7, 0xC19BF174, 0xE49B69C1, 0xEFBE4786, 0xFC19DC6, 0x240CA1CC, 0x2DE92C6F, 0x4A7484AA, 0x5CB0A9DC, 0x76F988DA, 0x983E5152, 0xA831C66D, 0xB00327C8, 0xBF597FC7, 0xC6E00BF3, 0xD5A79147, 0x6CA6351, 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)
var HASH = new Array(0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A, 0x510E527F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19)
var W = new Array(64)
var a, b, c, d, e, f, g, h, i, j
var T1, T2
m[l >> 5] |= 0x80 << (24 - l % 32)
m[((l + 64 >> 9) << 4) + 15] = l
for ( var i = 0 ; i < m.length ; i += 16 ) {
a = HASH[0]
b = HASH[1]
c = HASH[2]
d = HASH[3]
e = HASH[4]
f = HASH[5]
g = HASH[6]
h = HASH[7]
for ( var j = 0 ; j < 64 ; j++) {
if (j < 16) W[j] = m[j + i]
else W[j] = this.safe_add(this.safe_add(this.safe_add(this.Gamma1256(W[j - 2]), W[j - 7]), this.Gamma0256(W[j - 15])), W[j - 16])
T1 = this.safe_add(this.safe_add(this.safe_add(this.safe_add(h, this.Sigma1256(e)), this.Ch(e, f, g)), K[j]), W[j])
T2 = this.safe_add(this.Sigma0256(a), this.Maj(a, b, c))
h = g
g = f
f = e
e = this.safe_add(d, T1)
d = c
c = b
b = a
a = this.safe_add(T1, T2)
}
HASH[0] = this.safe_add(a, HASH[0])
HASH[1] = this.safe_add(b, HASH[1])
HASH[2] = this.safe_add(c, HASH[2])
HASH[3] = this.safe_add(d, HASH[3])
HASH[4] = this.safe_add(e, HASH[4])
HASH[5] = this.safe_add(f, HASH[5])
HASH[6] = this.safe_add(g, HASH[6])
HASH[7] = this.safe_add(h, HASH[7])
}
return HASH
},
str2binb : function (str) {
var bin = Array()
var mask = (1 << this.getChrsz()) - 1
for (var i = 0 ; i < str.length * this.getChrsz() ; i += this.getChrsz()) {
bin[i >> 5] |= (str.charCodeAt(i / this.getChrsz()) & mask) << (24 - i % 32)
}
return bin
},
Utf8Encode : function (string) {
string = string.replace(/\r\n/g,'\n')
var utftext = ''
for (var n = 0 ; n < string.length ; n++) {
var c = string.charCodeAt(n)
if (c < 128) {
utftext += String.fromCharCode(c)
}
else if((c > 127) && (c < 2048)) {
utftext += String.fromCharCode((c >> 6) | 192)
utftext += String.fromCharCode((c & 63) | 128)
}
else {
utftext += String.fromCharCode((c >> 12) | 224)
utftext += String.fromCharCode(((c >> 6) & 63) | 128)
utftext += String.fromCharCode((c & 63) | 128)
}
}
return utftext
},
binb2hex : function (binarray) {
var hex_tab = this.getUpper_case() ? '0123456789ABCDEF' : '0123456789abcdef'
var str = ''
for (var i = 0 ; i < binarray.length * 4 ; i++) {
str += hex_tab.charAt((binarray[i >> 2] >> ((3 - i % 4) * 8 + 4)) & 0xF)
+ hex_tab.charAt((binarray[i >> 2] >> ((3 - i % 4) * 8)) & 0xF)
}
return str
},
hash : function (s) {
s = this.Utf8Encode(s)
return this.binb2hex(this.core_sha256(this.str2binb(s), s.length * this.getChrsz()))
}
}
}
})