SHA1加密算法 - 風雲工作室

{

var hex_chr = "0123456789abcdef";

return calcSHA1(str);

function hex(num)

{

var str = "";

for(var j = 7; j >= 0; j--)

str += hex_chr.charAt((num >> (j * 4)) & 0x0F);

return str;

}

function str2blks_SHA1(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(var 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;

}

function safe_add(x, y)

{

var lsw = (x & 0xFFFF) + (y & 0xFFFF);

var msw = (x >> 16) + (y >> 16) + (lsw >> 16);

return (msw << 16) | (lsw & 0xFFFF);

}

function rol(num, cnt)

{

return (num << cnt) | (num >>> (32 - cnt));

}

function ft(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;

}

function kt(t)

{

return (t < 20) ?  1518500249 : (t < 40) ?  1859775393 :

(t < 60) ? -1894007588 : -899497514;

}

function calcSHA1(str)

{

var x = 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] = rol(w[j-3] ^ w[j-8] ^ w[j-14] ^ w[j-16], 1);

var t = safe_add(safe_add(rol(a, 5), ft(j, b, c, d)), safe_add(safe_add(e, w[j]), kt(j)));

e = d;

d = c;

c = rol(b, 30);

b = a;

a = t;

}

a = safe_add(a, olda);

b = safe_add(b, oldb);

c = safe_add(c, oldc);

d = safe_add(d, oldd);

e = safe_add(e, olde);

}

return hex(a) + hex(b) + hex(c) + hex(d) + hex(e);

}

}</script>

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