package com.adobe.crypto
{
import com.adobe.utils.IntUtil;
import flash.utils.ByteArray;
import mx.utils.Base64Encoder;
/**
* The SHA-224 algorithm
*
* @see http://csrc.nist.gov/publications/fips/fips180-2/fips180-2withchangenotice.pdf
*/
public class SHA224
{
/**
* Performs the SHA224 hash algorithm on a string.
*
* @param s The string to hash
* @return A string containing the hash value of s
* @langversion ActionScript 3.0
* @playerversion 9.0
* @tiptext
*/
public static function hash( s:String ):String {
var blocks:Array = createBlocksFromString( s );
var byteArray:ByteArray = hashBlocks( blocks );
return IntUtil.toHex( byteArray.readInt(), true )
+ IntUtil.toHex( byteArray.readInt(), true )
+ IntUtil.toHex( byteArray.readInt(), true )
+ IntUtil.toHex( byteArray.readInt(), true )
+ IntUtil.toHex( byteArray.readInt(), true )
+ IntUtil.toHex( byteArray.readInt(), true )
+ IntUtil.toHex( byteArray.readInt(), true );
}
/**
* Performs the SHA224 hash algorithm on a ByteArray.
*
* @param data The ByteArray data to hash
* @return A string containing the hash value of data
* @langversion ActionScript 3.0
* @playerversion 9.0
*/
public static function hashBytes( data:ByteArray ):String
{
var blocks:Array = createBlocksFromByteArray( data );
var byteArray:ByteArray = hashBlocks(blocks);
return IntUtil.toHex( byteArray.readInt(), true )
+ IntUtil.toHex( byteArray.readInt(), true )
+ IntUtil.toHex( byteArray.readInt(), true )
+ IntUtil.toHex( byteArray.readInt(), true )
+ IntUtil.toHex( byteArray.readInt(), true )
+ IntUtil.toHex( byteArray.readInt(), true )
+ IntUtil.toHex( byteArray.readInt(), true );
}
/**
* Performs the SHA224 hash algorithm on a string, then does
* Base64 encoding on the result.
*
* @param s The string to hash
* @return The base64 encoded hash value of s
* @langversion ActionScript 3.0
* @playerversion 9.0
* @tiptext
*/
public static function hashToBase64( s:String ):String
{
var blocks:Array = createBlocksFromString( s );
var byteArray:ByteArray = hashBlocks(blocks);
var charsInByteArray:String = "";
byteArray.position = 0;
for (var j:int = 0; j < byteArray.length; j++)
{
var byte:uint = byteArray.readUnsignedByte();
charsInByteArray += String.fromCharCode(byte);
}
var encoder:Base64Encoder = new Base64Encoder();
encoder.encode(charsInByteArray);
return encoder.flush();
}
private static function hashBlocks( blocks:Array ):ByteArray {
var h0:int = 0xc1059ed8;
var h1:int = 0x367cd507;
var h2:int = 0x3070dd17;
var h3:int = 0xf70e5939;
var h4:int = 0xffc00b31;
var h5:int = 0x68581511;
var h6:int = 0x64f98fa7;
var h7:int = 0xbefa4fa4;
var k:Array = new Array(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);
var len:int = blocks.length;
var w:Array = new Array();
for ( var i:int = 0; i < len; i += 16 ) {
var a:int = h0;
var b:int = h1;
var c:int = h2;
var d:int = h3;
var e:int = h4;
var f:int = h5;
var g:int = h6;
var h:int = h7;
for(var t:int = 0; t < 64; t++) {
if ( t < 16 ) {
w[t] = blocks[ i + t ];
if(isNaN(w[t])) { w[t] = 0; }
} else {
var ws0:int = IntUtil.ror(w[t-15], 7) ^ IntUtil.ror(w[t-15], 18) ^ (w[t-15] >>> 3);
var ws1:int = IntUtil.ror(w[t-2], 17) ^ IntUtil.ror(w[t-2], 19) ^ (w[t-2] >>> 10);
w[t] = w[t-16] + ws0 + w[t-7] + ws1;
}
var s0:int = IntUtil.ror(a, 2) ^ IntUtil.ror(a, 13) ^ IntUtil.ror(a, 22);
var maj:int = (a & b) ^ (a & c) ^ (b & c);
var t2:int = s0 + maj;
var s1:int = IntUtil.ror(e, 6) ^ IntUtil.ror(e, 11) ^ IntUtil.ror(e, 25);
var ch:int = (e & f) ^ ((~e) & g);
var t1:int = h + s1 + ch + k[t] + w[t];
h = g;
g = f;
f = e;
e = d + t1;
d = c;
c = b;
b = a;
a = t1 + t2;
}
h0 += a;
h1 += b;
h2 += c;
h3 += d;
h4 += e;
h5 += f;
h6 += g;
h7 += h;
}
var byteArray:ByteArray = new ByteArray();
byteArray.writeInt(h0);
byteArray.writeInt(h1);
byteArray.writeInt(h2);
byteArray.writeInt(h3);
byteArray.writeInt(h4);
byteArray.writeInt(h5);
byteArray.writeInt(h6);
byteArray.position = 0;
return byteArray;
}
/**
* Converts a ByteArray to a sequence of 16-word blocks
* that we'll do the processing on. Appends padding
* and length in the process.
*
* @param data The data to split into blocks
* @return An array containing the blocks into which data was split
*/
private static function createBlocksFromByteArray( data:ByteArray ):Array
{
var oldPosition:int = data.position;
data.position = 0;
var blocks:Array = new Array();
var len:int = data.length * 8;
var mask:int = 0xFF; for( var i:int = 0; i < len; i += 8 )
{
blocks[ i >> 5 ] |= ( data.readByte() & mask ) << ( 24 - i % 32 );
}
blocks[ len >> 5 ] |= 0x80 << ( 24 - len % 32 );
blocks[ ( ( ( len + 64 ) >> 9 ) << 4 ) + 15 ] = len;
data.position = oldPosition;
return blocks;
}
/**
* Converts a string to a sequence of 16-word blocks
* that we'll do the processing on. Appends padding
* and length in the process.
*
* @param s The string to split into blocks
* @return An array containing the blocks that s was split into.
*/
private static function createBlocksFromString( s:String ):Array
{
var blocks:Array = new Array();
var len:int = s.length * 8;
var mask:int = 0xFF; for( var i:int = 0; i < len; i += 8 ) {
blocks[ i >> 5 ] |= ( s.charCodeAt( i / 8 ) & mask ) << ( 24 - i % 32 );
}
blocks[ len >> 5 ] |= 0x80 << ( 24 - len % 32 );
blocks[ ( ( ( len + 64 ) >> 9 ) << 4 ) + 15 ] = len;
return blocks;
}
}
}