So I need to get a SHA1 hash of a byte array in javascript (Will be array of integer values 0-255), I can't seem to figure out how to achive this.
I need to be able to get the same result as the C# SHA1.ComputeHash function, meaning I input a byte array and get a 20 byte array back representing the resulting checksum.
Does anyone have a way to achieve this?
Thanks!
Use the calcSHA1FromByte function to get the sha1 of a byte array
var SHA1Generator = {
hex_chr: "0123456789abcdef",
hex: function (num) {
var str = "";
for (var j = 7; j >= 0; j--)
str += this.hex_chr.charAt((num >> (j * 4)) & 0x0F);
return str;
},
str2blks_SHA1: function (str) {
var nblk = ((str.length + 8) >> 6) + 1;
var blks = new Array(nblk * 16);
for (var i = 0; i < nblk * 16; i++) blks[i] = 0;
for (i = 0; i < str.length; i++)
blks[i >> 2] |= str.charCodeAt(i) << (24 - (i % 4) * 8);
blks[i >> 2] |= 0x80 << (24 - (i % 4) * 8);
blks[nblk * 16 - 1] = str.length * 8;
return blks;
},
add: function (x, y) {
var lsw = (x & 0xFFFF) + (y & 0xFFFF);
var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
return (msw << 16) | (lsw & 0xFFFF);
},
rol: function (num, cnt) {
return (num << cnt) | (num >>> (32 - cnt));
},
ft: function (t, b, c, d) {
if (t < 20) return (b & c) | ((~b) & d);
if (t < 40) return b ^ c ^ d;
if (t < 60) return (b & c) | (b & d) | (c & d);
return b ^ c ^ d;
},
kt: function (t) {
return (t < 20) ? 1518500249 : (t < 40) ? 1859775393 :
(t < 60) ? -1894007588 : -899497514;
},
calcSHA1FromByte: function(byteArr) {
var str = '';
for(var i=0; i<byteArr.length; i++)
str += String.fromCharCode(byteArr[i]);
return this.calcSHA1(str);
},
calcSHA1: function (str) {
if (str != '') {
var x = this.str2blks_SHA1(str);
var w = new Array(80);
var a = 1732584193;
var b = -271733879;
var c = -1732584194;
var d = 271733878;
var e = -1009589776;
for (var i = 0; i < x.length; i += 16) {
var olda = a;
var oldb = b;
var oldc = c;
var oldd = d;
var olde = e;
for (var j = 0; j < 80; j++) {
if (j < 16) w[j] = x[i + j];
else w[j] = this.rol(w[j - 3] ^ w[j - 8] ^ w[j - 14] ^ w[j - 16], 1);
t = this.add(this.add(this.rol(a, 5), this.ft(j, b, c, d)), this.add(this.add(e, w[j]), this.kt(j)));
e = d;
d = c;
c = this.rol(b, 30);
b = a;
a = t;
}
a = this.add(a, olda);
b = this.add(b, oldb);
c = this.add(c, oldc);
d = this.add(d, oldd);
e = this.add(e, olde);
}
return this.hex(a) + this.hex(b) + this.hex(c) + this.hex(d) + this.hex(e);
}
else {
return '';
}
}
};
// your byte array
var byteArr = ['100','101','114'];
var sha1 = SHA1Generator.calcSHA1FromByte(byteArr);
