128 lines
4.1 KiB
ActionScript
Executable file
128 lines
4.1 KiB
ActionScript
Executable file
/*
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Copyright (c) 2008, Adobe Systems Incorporated
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of Adobe Systems Incorporated nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package com.adobe.crypto {
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import flash.utils.ByteArray;
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import flash.utils.Endian;
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import flash.utils.describeType;
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/**
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* Keyed-Hashing for Message Authentication
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* Implementation based on algorithm description at
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* http://www.faqs.org/rfcs/rfc2104.html
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*/
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public class HMAC
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{
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/**
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* Performs the HMAC hash algorithm using byte arrays.
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*
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* @param secret The secret key
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* @param message The message to hash
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* @param algorithm Hash object to use
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* @return A string containing the hash value of message
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* @langversion ActionScript 3.0
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* @playerversion Flash 8.5
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* @tiptext
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*/
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public static function hash( secret:String, message:String, algorithm:Object = null ):String
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{
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var text:ByteArray = new ByteArray();
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var k_secret:ByteArray = new ByteArray();
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text.writeUTFBytes(message);
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k_secret.writeUTFBytes(secret);
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return hashBytes(k_secret, text, algorithm);
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}
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/**
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* Performs the HMAC hash algorithm using string.
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*
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* @param secret The secret key
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* @param message The message to hash
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* @param algorithm Hash object to use
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* @return A string containing the hash value of message
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* @langversion ActionScript 3.0
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* @playerversion Flash 8.5
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* @tiptext
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*/
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public static function hashBytes( secret:ByteArray, message:ByteArray, algorithm:Object = null ):String
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{
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var ipad:ByteArray = new ByteArray();
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var opad:ByteArray = new ByteArray();
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var endian:String = Endian.BIG_ENDIAN;
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if(algorithm == null){
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algorithm = MD5;
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}
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if ( describeType(algorithm).@name.toString() == "com.adobe.crypto::MD5" ) {
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endian = Endian.LITTLE_ENDIAN;
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}
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if ( secret.length > 64 ) {
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algorithm.hashBytes(secret);
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secret = new ByteArray();
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secret.endian = endian;
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while ( algorithm.digest.bytesAvailable != 0 ) {
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secret.writeInt(algorithm.digest.readInt());
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}
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}
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secret.length = 64
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secret.position = 0;
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for ( var x:int = 0; x < 64; x++ ) {
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var byte:int = secret.readByte();
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ipad.writeByte(0x36 ^ byte);
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opad.writeByte(0x5c ^ byte);
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}
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ipad.writeBytes(message);
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algorithm.hashBytes(ipad);
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var tmp:ByteArray = new ByteArray();
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tmp.endian = endian;
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while ( algorithm.digest.bytesAvailable != 0 ) {
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tmp.writeInt(algorithm.digest.readInt());
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}
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tmp.position = 0;
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while ( tmp.bytesAvailable != 0 ) {
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opad.writeByte(tmp.readUnsignedByte());
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}
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return algorithm.hashBytes( opad );
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}
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}
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}
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