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