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authorCash Costello <cash.costello@gmail.com>2010-10-24 21:08:27 +0000
committerCash Costello <cash.costello@gmail.com>2010-10-24 21:08:27 +0000
commitda1493b95a2f0b5000a487ae373c9318c58d0b2d (patch)
treea339b053ade9fb15a1717bdf248a59afc9b3d239 /vendors/uploadify/com/adobe/crypto/MD5Stream.as
parent5161b1c8fdc8ff69005f864a89127fc18db6d4ed (diff)
downloadelgg-da1493b95a2f0b5000a487ae373c9318c58d0b2d.tar.gz
elgg-da1493b95a2f0b5000a487ae373c9318c58d0b2d.tar.bz2
partial implementation of flash uploader
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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;
+
+ /**
+ * Perform MD5 hash of an input stream in chunks. This class is
+ * based on com.adobe.crypto.MD5 and can process data in
+ * chunks. Both block creation and hash computation are done
+ * together for whatever input is available so that the memory
+ * overhead at a time is always fixed. Memory usage is governed by
+ * two parameters: one is the amount of data passed in to update()
+ * and the other is memoryBlockSize. The latter comes into play
+ * only when the memory window exceeds the pre allocated memory
+ * window of flash player. Usage: create an instance, call
+ * update(data) repeatedly for all chunks and finally complete()
+ * which will return the md5 hash.
+ */
+ public class MD5Stream
+ {
+ private static var mask:int = 0xFF;
+
+ private var arr:Array = [];
+
+ /* running count of length */
+ private var arrLen:int;
+
+ // initialize the md buffers
+ private var a:int = 1732584193;
+ private var b:int = -271733879;
+ private var c:int = -1732584194;
+ private var d:int = 271733878;
+
+ // variables to store previous values
+ private var aa:int;
+ private var bb:int;
+ private var cc:int;
+ private var dd:int;
+
+ /* index for data read */
+ private var arrIndexLen:int = 0;
+ /* index for hash computation */
+ private var arrProcessIndex:int = 0;
+ /* index for removing stale arr values */
+ private var cleanIndex:int = 0;
+
+ /**
+ * Change this value from the default (16384) in the range of
+ * MBs to actually affect GC as GC allocates in pools of
+ * memory */
+ public var memoryBlockSize:int = 16384;
+
+
+ public function MD5Stream()
+ {
+
+ }
+
+
+ /**
+ * Pass in chunks of the input data with update(), call
+ * complete() with an optional chunk which will return the
+ * final hash. Equivalent to the way
+ * java.security.MessageDigest works.
+ *
+ * @param input The optional bytearray chunk which is the final part of the input
+ * @return A string containing the hash value
+ * @langversion ActionScript 3.0
+ * @playerversion Flash 8.5
+ * @tiptext
+ */
+ public function complete(input:ByteArray=null):String
+ {
+ if ( arr.length == 0 )
+ {
+ if ( input == null )
+ {
+ throw new Error("null input to complete without prior call to update. At least an empty bytearray must be passed.");
+ }
+ }
+
+ if ( input != null )
+ {
+ readIntoArray(input);
+ }
+
+ //pad, append length
+ padArray(arrLen);
+
+ hashRemainingChunks(false);
+
+ var res:String = IntUtil.toHex( a ) + IntUtil.toHex( b ) +
+ IntUtil.toHex( c ) + IntUtil.toHex( d );
+ resetFields();
+
+ return res;
+ }
+
+ /**
+ * Pass in chunks of the input data with update(), call
+ * complete() with an optional chunk which will return the
+ * final hash. Equivalent to the way
+ * java.security.MessageDigest works.
+ *
+ * @param input The bytearray chunk to perform the hash on
+ * @langversion ActionScript 3.0
+ * @playerversion Flash 8.5
+ * @tiptext
+ */
+ public function update(input:ByteArray):void
+ {
+ readIntoArray(input);
+ hashRemainingChunks();
+ }
+
+ /**
+ * Re-initialize this instance for use to perform hashing on
+ * another input stream. This is called automatically by
+ * complete().
+ *
+ * @langversion ActionScript 3.0
+ * @playerversion Flash 8.5
+ * @tiptext
+ */
+ public function resetFields():void
+ {
+ //truncate array
+ arr.length = 0;
+ arrLen = 0;
+
+ // initialize the md buffers
+ a = 1732584193;
+ b = -271733879;
+ c = -1732584194;
+ d = 271733878;
+
+ // variables to store previous values
+ aa = 0;
+ bb = 0;
+ cc = 0;
+ dd = 0;
+
+ arrIndexLen = 0;
+ arrProcessIndex = 0;
+ cleanIndex = 0;
+ }
+
+ /** read into arr and free up used blocks of arr */
+ private function readIntoArray(input:ByteArray):void
+ {
+ var closestChunkLen:int = input.length * 8;
+ arrLen += closestChunkLen;
+
+ /* clean up memory. if there are entries in the array that
+ * are already processed and the amount is greater than
+ * memoryBlockSize, create a new array, copy the last
+ * block into it and let the old one get picked up by
+ * GC. */
+ if ( arrProcessIndex - cleanIndex > memoryBlockSize )
+ {
+ var newarr:Array= new Array();
+
+ /* AS Arrays in sparse arrays. arr[2002] can exist
+ * without values for arr[0] - arr[2001] */
+ for ( var j:int = arrProcessIndex; j < arr.length; j++ )
+ {
+ newarr[j] = arr[j];
+ }
+
+ cleanIndex = arrProcessIndex;
+ arr = null;
+ arr = newarr;
+ }
+
+ for ( var k:int = 0; k < closestChunkLen; k+=8 )
+ {
+ //discard high bytes (convert to uint)
+ arr[ int(arrIndexLen >> 5) ] |= ( input[ k / 8 ] & mask ) << ( arrIndexLen % 32 );
+ arrIndexLen += 8;
+ }
+
+
+ }
+
+ private function hashRemainingChunks(bUpdate:Boolean=true):void
+ {
+ var len:int = arr.length;
+
+ /* leave a 16 word block untouched if we are called from
+ * update. This is because, padArray() can modify the last
+ * block and this modification has to happen before we
+ * compute the hash. */
+ if ( bUpdate )
+ {
+ len -= 16;
+ }
+
+ /* don't do anything if don't have a 16 word block. */
+ if ( arrProcessIndex >= len || len - arrProcessIndex < 15 )
+ {
+ return;
+ }
+
+
+ for ( var i:int = arrProcessIndex; i < len ; i += 16, arrProcessIndex += 16)
+ {
+ // save previous values
+ aa = a;
+ bb = b;
+ cc = c;
+ dd = d;
+
+ // Round 1
+ a = ff( a, b, c, d, arr[int(i+ 0)], 7, -680876936 ); // 1
+ d = ff( d, a, b, c, arr[int(i+ 1)], 12, -389564586 ); // 2
+ c = ff( c, d, a, b, arr[int(i+ 2)], 17, 606105819 ); // 3
+ b = ff( b, c, d, a, arr[int(i+ 3)], 22, -1044525330 ); // 4
+ a = ff( a, b, c, d, arr[int(i+ 4)], 7, -176418897 ); // 5
+ d = ff( d, a, b, c, arr[int(i+ 5)], 12, 1200080426 ); // 6
+ c = ff( c, d, a, b, arr[int(i+ 6)], 17, -1473231341 ); // 7
+ b = ff( b, c, d, a, arr[int(i+ 7)], 22, -45705983 ); // 8
+ a = ff( a, b, c, d, arr[int(i+ 8)], 7, 1770035416 ); // 9
+ d = ff( d, a, b, c, arr[int(i+ 9)], 12, -1958414417 ); // 10
+ c = ff( c, d, a, b, arr[int(i+10)], 17, -42063 ); // 11
+ b = ff( b, c, d, a, arr[int(i+11)], 22, -1990404162 ); // 12
+ a = ff( a, b, c, d, arr[int(i+12)], 7, 1804603682 ); // 13
+ d = ff( d, a, b, c, arr[int(i+13)], 12, -40341101 ); // 14
+ c = ff( c, d, a, b, arr[int(i+14)], 17, -1502002290 ); // 15
+ b = ff( b, c, d, a, arr[int(i+15)], 22, 1236535329 ); // 16
+
+ // Round 2
+ a = gg( a, b, c, d, arr[int(i+ 1)], 5, -165796510 ); // 17
+ d = gg( d, a, b, c, arr[int(i+ 6)], 9, -1069501632 ); // 18
+ c = gg( c, d, a, b, arr[int(i+11)], 14, 643717713 ); // 19
+ b = gg( b, c, d, a, arr[int(i+ 0)], 20, -373897302 ); // 20
+ a = gg( a, b, c, d, arr[int(i+ 5)], 5, -701558691 ); // 21
+ d = gg( d, a, b, c, arr[int(i+10)], 9, 38016083 ); // 22
+ c = gg( c, d, a, b, arr[int(i+15)], 14, -660478335 ); // 23
+ b = gg( b, c, d, a, arr[int(i+ 4)], 20, -405537848 ); // 24
+ a = gg( a, b, c, d, arr[int(i+ 9)], 5, 568446438 ); // 25
+ d = gg( d, a, b, c, arr[int(i+14)], 9, -1019803690 ); // 26
+ c = gg( c, d, a, b, arr[int(i+ 3)], 14, -187363961 ); // 27
+ b = gg( b, c, d, a, arr[int(i+ 8)], 20, 1163531501 ); // 28
+ a = gg( a, b, c, d, arr[int(i+13)], 5, -1444681467 ); // 29
+ d = gg( d, a, b, c, arr[int(i+ 2)], 9, -51403784 ); // 30
+ c = gg( c, d, a, b, arr[int(i+ 7)], 14, 1735328473 ); // 31
+ b = gg( b, c, d, a, arr[int(i+12)], 20, -1926607734 ); // 32
+
+ // Round 3
+ a = hh( a, b, c, d, arr[int(i+ 5)], 4, -378558 ); // 33
+ d = hh( d, a, b, c, arr[int(i+ 8)], 11, -2022574463 ); // 34
+ c = hh( c, d, a, b, arr[int(i+11)], 16, 1839030562 ); // 35
+ b = hh( b, c, d, a, arr[int(i+14)], 23, -35309556 ); // 36
+ a = hh( a, b, c, d, arr[int(i+ 1)], 4, -1530992060 ); // 37
+ d = hh( d, a, b, c, arr[int(i+ 4)], 11, 1272893353 ); // 38
+ c = hh( c, d, a, b, arr[int(i+ 7)], 16, -155497632 ); // 39
+ b = hh( b, c, d, a, arr[int(i+10)], 23, -1094730640 ); // 40
+ a = hh( a, b, c, d, arr[int(i+13)], 4, 681279174 ); // 41
+ d = hh( d, a, b, c, arr[int(i+ 0)], 11, -358537222 ); // 42
+ c = hh( c, d, a, b, arr[int(i+ 3)], 16, -722521979 ); // 43
+ b = hh( b, c, d, a, arr[int(i+ 6)], 23, 76029189 ); // 44
+ a = hh( a, b, c, d, arr[int(i+ 9)], 4, -640364487 ); // 45
+ d = hh( d, a, b, c, arr[int(i+12)], 11, -421815835 ); // 46
+ c = hh( c, d, a, b, arr[int(i+15)], 16, 530742520 ); // 47
+ b = hh( b, c, d, a, arr[int(i+ 2)], 23, -995338651 ); // 48
+
+ // Round 4
+ a = ii( a, b, c, d, arr[int(i+ 0)], 6, -198630844 ); // 49
+ d = ii( d, a, b, c, arr[int(i+ 7)], 10, 1126891415 ); // 50
+ c = ii( c, d, a, b, arr[int(i+14)], 15, -1416354905 ); // 51
+ b = ii( b, c, d, a, arr[int(i+ 5)], 21, -57434055 ); // 52
+ a = ii( a, b, c, d, arr[int(i+12)], 6, 1700485571 ); // 53
+ d = ii( d, a, b, c, arr[int(i+ 3)], 10, -1894986606 ); // 54
+ c = ii( c, d, a, b, arr[int(i+10)], 15, -1051523 ); // 55
+ b = ii( b, c, d, a, arr[int(i+ 1)], 21, -2054922799 ); // 56
+ a = ii( a, b, c, d, arr[int(i+ 8)], 6, 1873313359 ); // 57
+ d = ii( d, a, b, c, arr[int(i+15)], 10, -30611744 ); // 58
+ c = ii( c, d, a, b, arr[int(i+ 6)], 15, -1560198380 ); // 59
+ b = ii( b, c, d, a, arr[int(i+13)], 21, 1309151649 ); // 60
+ a = ii( a, b, c, d, arr[int(i+ 4)], 6, -145523070 ); // 61
+ d = ii( d, a, b, c, arr[int(i+11)], 10, -1120210379 ); // 62
+ c = ii( c, d, a, b, arr[int(i+ 2)], 15, 718787259 ); // 63
+ b = ii( b, c, d, a, arr[int(i+ 9)], 21, -343485551 ); // 64
+
+ a += aa;
+ b += bb;
+ c += cc;
+ d += dd;
+
+ }
+
+ }
+
+ private function padArray(len:int):void
+ {
+ arr[ int(len >> 5) ] |= 0x80 << ( len % 32 );
+ arr[ int(( ( ( len + 64 ) >>> 9 ) << 4 ) + 14) ] = len;
+ arrLen = arr.length;
+ }
+
+ /* Code below same as com.adobe.crypto.MD5 */
+
+ /**
+ * Auxiliary function f as defined in RFC
+ */
+ private static function f( x:int, y:int, z:int ):int {
+ return ( x & y ) | ( (~x) & z );
+ }
+
+ /**
+ * Auxiliary function g as defined in RFC
+ */
+ private static function g( x:int, y:int, z:int ):int {
+ return ( x & z ) | ( y & (~z) );
+ }
+
+ /**
+ * Auxiliary function h as defined in RFC
+ */
+ private static function h( x:int, y:int, z:int ):int {
+ return x ^ y ^ z;
+ }
+
+ /**
+ * Auxiliary function i as defined in RFC
+ */
+ private static function i( x:int, y:int, z:int ):int {
+ return y ^ ( x | (~z) );
+ }
+
+ /**
+ * A generic transformation function. The logic of ff, gg, hh, and
+ * ii are all the same, minus the function used, so pull that logic
+ * out and simplify the method bodies for the transoformation functions.
+ */
+ private static function transform( func:Function, a:int, b:int, c:int, d:int, x:int, s:int, t:int):int {
+ var tmp:int = a + int( func( b, c, d ) ) + x + t;
+ return IntUtil.rol( tmp, s ) + b;
+ }
+
+ /**
+ * ff transformation function
+ */
+ private static function ff ( a:int, b:int, c:int, d:int, x:int, s:int, t:int ):int {
+ return transform( f, a, b, c, d, x, s, t );
+ }
+
+ /**
+ * gg transformation function
+ */
+ private static function gg ( a:int, b:int, c:int, d:int, x:int, s:int, t:int ):int {
+ return transform( g, a, b, c, d, x, s, t );
+ }
+
+ /**
+ * hh transformation function
+ */
+ private static function hh ( a:int, b:int, c:int, d:int, x:int, s:int, t:int ):int {
+ return transform( h, a, b, c, d, x, s, t );
+ }
+
+ /**
+ * ii transformation function
+ */
+ private static function ii ( a:int, b:int, c:int, d:int, x:int, s:int, t:int ):int {
+ return transform( i, a, b, c, d, x, s, t );
+ }
+
+ }
+} \ No newline at end of file
generated by cgit v1.2.3 (git 2.39.1) at 2024-09-04 15:55:23 +0000