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/*
Copyright (c) 2008, Adobe Systems Incorporated
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the name of Adobe Systems Incorporated nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.adobe.crypto
{
import com.adobe.utils.IntUtil;
import flash.utils.ByteArray;
import mx.utils.Base64Encoder;
/**
* US Secure Hash Algorithm 1 (SHA1)
*
* Implementation based on algorithm description at
* http://www.faqs.org/rfcs/rfc3174.html
*/
public class SHA1
{
public static var digest:ByteArray;
/**
* Performs the SHA1 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 );
}
/**
* Performs the SHA1 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 = SHA1.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 );
}
/**
* Performs the SHA1 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 = SHA1.createBlocksFromString( s );
var byteArray:ByteArray = hashBlocks(blocks);
// ByteArray.toString() returns the contents as a UTF-8 string,
// which we can't use because certain byte sequences might trigger
// a UTF-8 conversion. Instead, we convert the bytes to characters
// one by one.
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
{
// initialize the h's
var h0:int = 0x67452301;
var h1:int = 0xefcdab89;
var h2:int = 0x98badcfe;
var h3:int = 0x10325476;
var h4:int = 0xc3d2e1f0;
var len:int = blocks.length;
var w:Array = new Array( 80 );
// loop over all of the blocks
for ( var i:int = 0; i < len; i += 16 ) {
// 6.1.c
var a:int = h0;
var b:int = h1;
var c:int = h2;
var d:int = h3;
var e:int = h4;
// 80 steps to process each block
// TODO: unroll for faster execution, or 4 loops of
// 20 each to avoid the k and f function calls
for ( var t:int = 0; t < 80; t++ ) {
if ( t < 16 ) {
// 6.1.a
w[ t ] = blocks[ i + t ];
} else {
// 6.1.b
w[ t ] = IntUtil.rol( w[ t - 3 ] ^ w[ t - 8 ] ^ w[ t - 14 ] ^ w[ t - 16 ], 1 );
}
// 6.1.d
var temp:int = IntUtil.rol( a, 5 ) + f( t, b, c, d ) + e + int( w[ t ] ) + k( t );
e = d;
d = c;
c = IntUtil.rol( b, 30 );
b = a;
a = temp;
}
// 6.1.e
h0 += a;
h1 += b;
h2 += c;
h3 += d;
h4 += e;
}
var byteArray:ByteArray = new ByteArray();
byteArray.writeInt(h0);
byteArray.writeInt(h1);
byteArray.writeInt(h2);
byteArray.writeInt(h3);
byteArray.writeInt(h4);
byteArray.position = 0;
digest = new ByteArray();
digest.writeBytes(byteArray);
digest.position = 0;
return byteArray;
}
/**
* Performs the logical function based on t
*/
private static function f( t:int, b:int, c:int, d:int ):int {
if ( t < 20 ) {
return ( b & c ) | ( ~b & d );
} else if ( t < 40 ) {
return b ^ c ^ d;
} else if ( t < 60 ) {
return ( b & c ) | ( b & d ) | ( c & d );
}
return b ^ c ^ d;
}
/**
* Determines the constant value based on t
*/
private static function k( t:int ):int {
if ( t < 20 ) {
return 0x5a827999;
} else if ( t < 40 ) {
return 0x6ed9eba1;
} else if ( t < 60 ) {
return 0x8f1bbcdc;
}
return 0xca62c1d6;
}
/**
* 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; // ignore hi byte of characters > 0xFF
for( var i:int = 0; i < len; i += 8 )
{
blocks[ i >> 5 ] |= ( data.readByte() & mask ) << ( 24 - i % 32 );
}
// append padding and length
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; // ignore hi byte of characters > 0xFF
for( var i:int = 0; i < len; i += 8 ) {
blocks[ i >> 5 ] |= ( s.charCodeAt( i / 8 ) & mask ) << ( 24 - i % 32 );
}
// append padding and length
blocks[ len >> 5 ] |= 0x80 << ( 24 - len % 32 );
blocks[ ( ( ( len + 64 ) >> 9 ) << 4 ) + 15 ] = len;
return blocks;
}
}
}
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