68 lines
2.1 KiB
Haxe
68 lines
2.1 KiB
Haxe
package io.newgrounds.crypto;
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import haxe.io.Bytes;
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/**
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* The following was straight-up ganked from https://github.com/iskolbin/rc4hx
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*
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* You da real MVP iskolbin...
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2015 iskolbin
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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**/
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class Rc4 {
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var perm = Bytes.alloc( 256 );
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var index1: Int = 0;
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var index2: Int = 0;
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public function new( key: Bytes ) {
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for ( i in 0...256 ) {
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perm.set( i, i );
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}
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var j: Int = 0;
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for ( i in 0...256 ) {
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j = ( j + perm.get( i ) + key.get( i % key.length )) % 256;
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swap( i, j );
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}
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}
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inline function swap( i: Int, j: Int ): Void {
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var temp = perm.get( i );
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perm.set( i, perm.get( j ));
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perm.set( j, temp );
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}
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public function crypt( input: Bytes ): Bytes {
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var output = Bytes.alloc( input.length );
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for ( i in 0...input.length ) {
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index1 = ( index1 + 1 ) % 256;
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index2 = ( index2 + perm.get( index1 )) % 256;
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swap( index1, index2 );
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var j = ( perm.get( index1 ) + perm.get( index2 )) % 256;
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output.set( i, input.get( i ) ^ perm.get( j ));
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}
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return output;
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}
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} |