Jumat, 02 Juli 2010

Actionscript - SHA-1

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Actionscript - SHA-1

SHA-1 the Secure Hash Algorithm (SHA) was developed by NIST and is specified in the Secure Hash Standard (SHS, FIPS 180).

This script is used to process variable length message into a fixed-length output using the SHA-1 algorithm.



Source code SHA-1



/**

*

* Secure Hash Algorithm (SHA1)

* http://www.webtoolkit.info/

*

**/


function SHA1 (msg) {


function rotate_left(n,s) {

var t4 = ( n<<s ) | (n>>>(32-s));

return t4;

};


function lsb_hex(val) {

var str="";

var i;

var vh;

var vl;


for( i=0; i<=6; i+=2 ) {

vh = (val>>>(i*4+4))&0x0f;

vl = (val>>>(i*4))&0x0f;

str += vh.toString(16) + vl.toString(16);

}

return str;

};


function cvt_hex(val) {

var str="";

var i;

var v;


for( i=7; i>=0; i-- ) {

v = (val>>>(i*4))&0x0f;

str += v.toString(16);

}

return str;

};



function Utf8Encode(string) {


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;

};


var blockstart;

var i, j;

var W = new Array(80);

var H0 = 0x67452301;

var H1 = 0xEFCDAB89;

var H2 = 0x98BADCFE;

var H3 = 0x10325476;

var H4 = 0xC3D2E1F0;

var A, B, C, D, E;

var temp;


msg = Utf8Encode(msg);


var msg_len = msg.length;


var word_array = new Array();

for( i=0; i<msg_len-3; i+=4 ) {

j = msg.charCodeAt(i)<<24 | msg.charCodeAt(i+1)<<16 |

msg.charCodeAt(i+2)<<8 | msg.charCodeAt(i+3);

word_array.push( j );

}


switch( msg_len % 4 ) {

case 0:

i = 0x080000000;

break;

case 1:

i = msg.charCodeAt(msg_len-1)<<24 | 0x0800000;

break;


case 2:

i = msg.charCodeAt(msg_len-2)<<24 | msg.charCodeAt(msg_len-1)<<16 | 0x08000;

break;


case 3:

i = msg.charCodeAt(msg_len-3)<<24 | msg.charCodeAt(msg_len-2)<<16 | msg.charCodeAt(msg_len-1)<<8 | 0x80;

break;

}


word_array.push( i );


while( (word_array.length % 16) != 14 ) word_array.push( 0 );


word_array.push( msg_len>>>29 );

word_array.push( (msg_len<<3)&0x0ffffffff );



for ( blockstart=0; blockstart<word_array.length; blockstart+=16 ) {

for( i=0; i<16; i++ ) W[i] = word_array[blockstart+i];

for( i=16; i<=79; i++ ) W[i] = rotate_left(W[i-3] ^ W[i-8] ^ W[i-14] ^ W[i-16], 1);


A = H0;

B = H1;

C = H2;

D = H3;

E = H4;


for( i= 0; i<=19; i++ ) {

temp = (rotate_left(A,5) + ((B&C) | (~B&D)) + E + W[i] + 0x5A827999) & 0x0ffffffff;

E = D;

D = C;

C = rotate_left(B,30);

B = A;

A = temp;

}


for( i=20; i<=39; i++ ) {

temp = (rotate_left(A,5) + (B ^ C ^ D) + E + W[i] + 0x6ED9EBA1) & 0x0ffffffff;

E = D;

D = C;

C = rotate_left(B,30);

B = A;

A = temp;

}


for( i=40; i<=59; i++ ) {

temp = (rotate_left(A,5) + ((B&C) | (B&D) | (C&D)) + E + W[i] + 0x8F1BBCDC) & 0x0ffffffff;

E = D;

D = C;

C = rotate_left(B,30);

B = A;

A = temp;

}


for( i=60; i<=79; i++ ) {

temp = (rotate_left(A,5) + (B ^ C ^ D) + E + W[i] + 0xCA62C1D6) & 0x0ffffffff;

E = D;

D = C;

C = rotate_left(B,30);

B = A;

A = temp;

}


H0 = (H0 + A) & 0x0ffffffff;

H1 = (H1 + B) & 0x0ffffffff;

H2 = (H2 + C) & 0x0ffffffff;

H3 = (H3 + D) & 0x0ffffffff;

H4 = (H4 + E) & 0x0ffffffff;


}


var temp = cvt_hex(H0) + cvt_hex(H1) + cvt_hex(H2) + cvt_hex(H3) + cvt_hex(H4);


return temp.toLowerCase();


}

Sumber : http://www.webtoolkit.info/actionscript-sha1.html | Download Article



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Diposkan oleh : Unknown Jam 7:43:00 AM

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