494 lines
27 KiB
C#
494 lines
27 KiB
C#
using System;
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using Org.BouncyCastle.Crypto.Parameters;
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namespace Org.BouncyCastle.Crypto.Engines
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{
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/// <remarks>A class that provides a basic DES engine.</remarks>
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public class DesEngine
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: IBlockCipher
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{
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internal const int BLOCK_SIZE = 8;
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private int[] workingKey;
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public virtual int[] GetWorkingKey()
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{
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return workingKey;
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}
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/**
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* initialise a DES cipher.
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*
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* @param forEncryption whether or not we are for encryption.
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* @param parameters the parameters required to set up the cipher.
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* @exception ArgumentException if the parameters argument is
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* inappropriate.
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*/
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public virtual void Init(
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bool forEncryption,
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ICipherParameters parameters)
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{
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if (!(parameters is KeyParameter))
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throw new ArgumentException("invalid parameter passed to DES init - " + parameters.GetType().ToString());
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workingKey = GenerateWorkingKey(forEncryption, ((KeyParameter)parameters).GetKey());
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}
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public virtual string AlgorithmName
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{
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get { return "DES"; }
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}
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public bool IsPartialBlockOkay
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{
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get { return false; }
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}
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public virtual int GetBlockSize()
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{
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return BLOCK_SIZE;
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}
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public virtual int ProcessBlock(
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byte[] input,
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int inOff,
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byte[] output,
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int outOff)
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{
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if (workingKey == null)
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throw new InvalidOperationException("DES engine not initialised");
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if ((inOff + BLOCK_SIZE) > input.Length)
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throw new DataLengthException("input buffer too short");
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if ((outOff + BLOCK_SIZE) > output.Length)
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throw new DataLengthException("output buffer too short");
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DesFunc(workingKey, input, inOff, output, outOff);
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return BLOCK_SIZE;
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}
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public virtual void Reset()
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{
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}
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/**
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* what follows is mainly taken from "Applied Cryptography", by
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* Bruce Schneier, however it also bears great resemblance to Richard
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* Outerbridge's D3DES...
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*/
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private static readonly short[] Df_Key =
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{
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0x01,0x23,0x45,0x67,0x89,0xab,0xcd,0xef,
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0xfe,0xdc,0xba,0x98,0x76,0x54,0x32,0x10,
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0x89,0xab,0xcd,0xef,0x01,0x23,0x45,0x67
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};
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private static readonly short[] bytebit =
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{
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128, 64, 32, 16, 8, 4, 2, 1
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};
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private static readonly int[] bigbyte =
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{
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0x800000, 0x400000, 0x200000, 0x100000,
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0x80000, 0x40000, 0x20000, 0x10000,
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0x8000, 0x4000, 0x2000, 0x1000,
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0x800, 0x400, 0x200, 0x100,
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0x80, 0x40, 0x20, 0x10,
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0x8, 0x4, 0x2, 0x1
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};
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/*
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* Use the key schedule specified in the Standard (ANSI X3.92-1981).
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*/
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private static readonly byte[] pc1 =
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{
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56, 48, 40, 32, 24, 16, 8, 0, 57, 49, 41, 33, 25, 17,
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9, 1, 58, 50, 42, 34, 26, 18, 10, 2, 59, 51, 43, 35,
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62, 54, 46, 38, 30, 22, 14, 6, 61, 53, 45, 37, 29, 21,
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13, 5, 60, 52, 44, 36, 28, 20, 12, 4, 27, 19, 11, 3
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};
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private static readonly byte[] totrot =
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{
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1, 2, 4, 6, 8, 10, 12, 14,
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15, 17, 19, 21, 23, 25, 27, 28
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};
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private static readonly byte[] pc2 =
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{
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13, 16, 10, 23, 0, 4, 2, 27, 14, 5, 20, 9,
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22, 18, 11, 3, 25, 7, 15, 6, 26, 19, 12, 1,
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40, 51, 30, 36, 46, 54, 29, 39, 50, 44, 32, 47,
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43, 48, 38, 55, 33, 52, 45, 41, 49, 35, 28, 31
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};
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private static readonly int[] SP1 =
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{
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unchecked((int) 0x01010400), unchecked((int) 0x00000000), unchecked((int) 0x00010000), unchecked((int) 0x01010404),
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unchecked((int) 0x01010004), unchecked((int) 0x00010404), unchecked((int) 0x00000004), unchecked((int) 0x00010000),
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unchecked((int) 0x00000400), unchecked((int) 0x01010400), unchecked((int) 0x01010404), unchecked((int) 0x00000400),
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unchecked((int) 0x01000404), unchecked((int) 0x01010004), unchecked((int) 0x01000000), unchecked((int) 0x00000004),
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unchecked((int) 0x00000404), unchecked((int) 0x01000400), unchecked((int) 0x01000400), unchecked((int) 0x00010400),
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unchecked((int) 0x00010400), unchecked((int) 0x01010000), unchecked((int) 0x01010000), unchecked((int) 0x01000404),
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unchecked((int) 0x00010004), unchecked((int) 0x01000004), unchecked((int) 0x01000004), unchecked((int) 0x00010004),
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unchecked((int) 0x00000000), unchecked((int) 0x00000404), unchecked((int) 0x00010404), unchecked((int) 0x01000000),
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unchecked((int) 0x00010000), unchecked((int) 0x01010404), unchecked((int) 0x00000004), unchecked((int) 0x01010000),
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unchecked((int) 0x01010400), unchecked((int) 0x01000000), unchecked((int) 0x01000000), unchecked((int) 0x00000400),
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unchecked((int) 0x01010004), unchecked((int) 0x00010000), unchecked((int) 0x00010400), unchecked((int) 0x01000004),
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unchecked((int) 0x00000400), unchecked((int) 0x00000004), unchecked((int) 0x01000404), unchecked((int) 0x00010404),
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unchecked((int) 0x01010404), unchecked((int) 0x00010004), unchecked((int) 0x01010000), unchecked((int) 0x01000404),
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unchecked((int) 0x01000004), unchecked((int) 0x00000404), unchecked((int) 0x00010404), unchecked((int) 0x01010400),
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unchecked((int) 0x00000404), unchecked((int) 0x01000400), unchecked((int) 0x01000400), unchecked((int) 0x00000000),
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unchecked((int) 0x00010004), unchecked((int) 0x00010400), unchecked((int) 0x00000000), unchecked((int) 0x01010004)
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};
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private static readonly int[] SP2 =
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{
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unchecked((int) 0x80108020), unchecked((int) 0x80008000), unchecked((int) 0x00008000), unchecked((int) 0x00108020),
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unchecked((int) 0x00100000), unchecked((int) 0x00000020), unchecked((int) 0x80100020), unchecked((int) 0x80008020),
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unchecked((int) 0x80000020), unchecked((int) 0x80108020), unchecked((int) 0x80108000), unchecked((int) 0x80000000),
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unchecked((int) 0x80008000), unchecked((int) 0x00100000), unchecked((int) 0x00000020), unchecked((int) 0x80100020),
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unchecked((int) 0x00108000), unchecked((int) 0x00100020), unchecked((int) 0x80008020), unchecked((int) 0x00000000),
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unchecked((int) 0x80000000), unchecked((int) 0x00008000), unchecked((int) 0x00108020), unchecked((int) 0x80100000),
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unchecked((int) 0x00100020), unchecked((int) 0x80000020), unchecked((int) 0x00000000), unchecked((int) 0x00108000),
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unchecked((int) 0x00008020), unchecked((int) 0x80108000), unchecked((int) 0x80100000), unchecked((int) 0x00008020),
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unchecked((int) 0x00000000), unchecked((int) 0x00108020), unchecked((int) 0x80100020), unchecked((int) 0x00100000),
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unchecked((int) 0x80008020), unchecked((int) 0x80100000), unchecked((int) 0x80108000), unchecked((int) 0x00008000),
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unchecked((int) 0x80100000), unchecked((int) 0x80008000), unchecked((int) 0x00000020), unchecked((int) 0x80108020),
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unchecked((int) 0x00108020), unchecked((int) 0x00000020), unchecked((int) 0x00008000), unchecked((int) 0x80000000),
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unchecked((int) 0x00008020), unchecked((int) 0x80108000), unchecked((int) 0x00100000), unchecked((int) 0x80000020),
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unchecked((int) 0x00100020), unchecked((int) 0x80008020), unchecked((int) 0x80000020), unchecked((int) 0x00100020),
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unchecked((int) 0x00108000), unchecked((int) 0x00000000), unchecked((int) 0x80008000), unchecked((int) 0x00008020),
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unchecked((int) 0x80000000), unchecked((int) 0x80100020), unchecked((int) 0x80108020), unchecked((int) 0x00108000)
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};
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private static readonly int[] SP3 =
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{
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unchecked((int) 0x00000208), unchecked((int) 0x08020200), unchecked((int) 0x00000000), unchecked((int) 0x08020008),
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unchecked((int) 0x08000200), unchecked((int) 0x00000000), unchecked((int) 0x00020208), unchecked((int) 0x08000200),
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unchecked((int) 0x00020008), unchecked((int) 0x08000008), unchecked((int) 0x08000008), unchecked((int) 0x00020000),
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unchecked((int) 0x08020208), unchecked((int) 0x00020008), unchecked((int) 0x08020000), unchecked((int) 0x00000208),
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unchecked((int) 0x08000000), unchecked((int) 0x00000008), unchecked((int) 0x08020200), unchecked((int) 0x00000200),
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unchecked((int) 0x00020200), unchecked((int) 0x08020000), unchecked((int) 0x08020008), unchecked((int) 0x00020208),
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unchecked((int) 0x08000208), unchecked((int) 0x00020200), unchecked((int) 0x00020000), unchecked((int) 0x08000208),
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unchecked((int) 0x00000008), unchecked((int) 0x08020208), unchecked((int) 0x00000200), unchecked((int) 0x08000000),
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unchecked((int) 0x08020200), unchecked((int) 0x08000000), unchecked((int) 0x00020008), unchecked((int) 0x00000208),
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unchecked((int) 0x00020000), unchecked((int) 0x08020200), unchecked((int) 0x08000200), unchecked((int) 0x00000000),
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unchecked((int) 0x00000200), unchecked((int) 0x00020008), unchecked((int) 0x08020208), unchecked((int) 0x08000200),
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unchecked((int) 0x08000008), unchecked((int) 0x00000200), unchecked((int) 0x00000000), unchecked((int) 0x08020008),
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unchecked((int) 0x08000208), unchecked((int) 0x00020000), unchecked((int) 0x08000000), unchecked((int) 0x08020208),
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unchecked((int) 0x00000008), unchecked((int) 0x00020208), unchecked((int) 0x00020200), unchecked((int) 0x08000008),
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unchecked((int) 0x08020000), unchecked((int) 0x08000208), unchecked((int) 0x00000208), unchecked((int) 0x08020000),
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unchecked((int) 0x00020208), unchecked((int) 0x00000008), unchecked((int) 0x08020008), unchecked((int) 0x00020200)
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};
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private static readonly int[] SP4 =
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{
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unchecked((int) 0x00802001), unchecked((int) 0x00002081), unchecked((int) 0x00002081), unchecked((int) 0x00000080),
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unchecked((int) 0x00802080), unchecked((int) 0x00800081), unchecked((int) 0x00800001), unchecked((int) 0x00002001),
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unchecked((int) 0x00000000), unchecked((int) 0x00802000), unchecked((int) 0x00802000), unchecked((int) 0x00802081),
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unchecked((int) 0x00000081), unchecked((int) 0x00000000), unchecked((int) 0x00800080), unchecked((int) 0x00800001),
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unchecked((int) 0x00000001), unchecked((int) 0x00002000), unchecked((int) 0x00800000), unchecked((int) 0x00802001),
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unchecked((int) 0x00000080), unchecked((int) 0x00800000), unchecked((int) 0x00002001), unchecked((int) 0x00002080),
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unchecked((int) 0x00800081), unchecked((int) 0x00000001), unchecked((int) 0x00002080), unchecked((int) 0x00800080),
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unchecked((int) 0x00002000), unchecked((int) 0x00802080), unchecked((int) 0x00802081), unchecked((int) 0x00000081),
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unchecked((int) 0x00800080), unchecked((int) 0x00800001), unchecked((int) 0x00802000), unchecked((int) 0x00802081),
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unchecked((int) 0x00000081), unchecked((int) 0x00000000), unchecked((int) 0x00000000), unchecked((int) 0x00802000),
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unchecked((int) 0x00002080), unchecked((int) 0x00800080), unchecked((int) 0x00800081), unchecked((int) 0x00000001),
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unchecked((int) 0x00802001), unchecked((int) 0x00002081), unchecked((int) 0x00002081), unchecked((int) 0x00000080),
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unchecked((int) 0x00802081), unchecked((int) 0x00000081), unchecked((int) 0x00000001), unchecked((int) 0x00002000),
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unchecked((int) 0x00800001), unchecked((int) 0x00002001), unchecked((int) 0x00802080), unchecked((int) 0x00800081),
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unchecked((int) 0x00002001), unchecked((int) 0x00002080), unchecked((int) 0x00800000), unchecked((int) 0x00802001),
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unchecked((int) 0x00000080), unchecked((int) 0x00800000), unchecked((int) 0x00002000), unchecked((int) 0x00802080)
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};
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private static readonly int[] SP5 =
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{
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unchecked((int) 0x00000100), unchecked((int) 0x02080100), unchecked((int) 0x02080000), unchecked((int) 0x42000100),
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unchecked((int) 0x00080000), unchecked((int) 0x00000100), unchecked((int) 0x40000000), unchecked((int) 0x02080000),
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unchecked((int) 0x40080100), unchecked((int) 0x00080000), unchecked((int) 0x02000100), unchecked((int) 0x40080100),
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unchecked((int) 0x42000100), unchecked((int) 0x42080000), unchecked((int) 0x00080100), unchecked((int) 0x40000000),
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unchecked((int) 0x02000000), unchecked((int) 0x40080000), unchecked((int) 0x40080000), unchecked((int) 0x00000000),
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unchecked((int) 0x40000100), unchecked((int) 0x42080100), unchecked((int) 0x42080100), unchecked((int) 0x02000100),
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unchecked((int) 0x42080000), unchecked((int) 0x40000100), unchecked((int) 0x00000000), unchecked((int) 0x42000000),
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unchecked((int) 0x02080100), unchecked((int) 0x02000000), unchecked((int) 0x42000000), unchecked((int) 0x00080100),
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unchecked((int) 0x00080000), unchecked((int) 0x42000100), unchecked((int) 0x00000100), unchecked((int) 0x02000000),
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unchecked((int) 0x40000000), unchecked((int) 0x02080000), unchecked((int) 0x42000100), unchecked((int) 0x40080100),
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unchecked((int) 0x02000100), unchecked((int) 0x40000000), unchecked((int) 0x42080000), unchecked((int) 0x02080100),
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unchecked((int) 0x40080100), unchecked((int) 0x00000100), unchecked((int) 0x02000000), unchecked((int) 0x42080000),
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unchecked((int) 0x42080100), unchecked((int) 0x00080100), unchecked((int) 0x42000000), unchecked((int) 0x42080100),
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unchecked((int) 0x02080000), unchecked((int) 0x00000000), unchecked((int) 0x40080000), unchecked((int) 0x42000000),
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unchecked((int) 0x00080100), unchecked((int) 0x02000100), unchecked((int) 0x40000100), unchecked((int) 0x00080000),
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unchecked((int) 0x00000000), unchecked((int) 0x40080000), unchecked((int) 0x02080100), unchecked((int) 0x40000100)
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};
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private static readonly int[] SP6 =
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{
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unchecked((int) 0x20000010), unchecked((int) 0x20400000), unchecked((int) 0x00004000), unchecked((int) 0x20404010),
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unchecked((int) 0x20400000), unchecked((int) 0x00000010), unchecked((int) 0x20404010), unchecked((int) 0x00400000),
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unchecked((int) 0x20004000), unchecked((int) 0x00404010), unchecked((int) 0x00400000), unchecked((int) 0x20000010),
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unchecked((int) 0x00400010), unchecked((int) 0x20004000), unchecked((int) 0x20000000), unchecked((int) 0x00004010),
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unchecked((int) 0x00000000), unchecked((int) 0x00400010), unchecked((int) 0x20004010), unchecked((int) 0x00004000),
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unchecked((int) 0x00404000), unchecked((int) 0x20004010), unchecked((int) 0x00000010), unchecked((int) 0x20400010),
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unchecked((int) 0x20400010), unchecked((int) 0x00000000), unchecked((int) 0x00404010), unchecked((int) 0x20404000),
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unchecked((int) 0x00004010), unchecked((int) 0x00404000), unchecked((int) 0x20404000), unchecked((int) 0x20000000),
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unchecked((int) 0x20004000), unchecked((int) 0x00000010), unchecked((int) 0x20400010), unchecked((int) 0x00404000),
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unchecked((int) 0x20404010), unchecked((int) 0x00400000), unchecked((int) 0x00004010), unchecked((int) 0x20000010),
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unchecked((int) 0x00400000), unchecked((int) 0x20004000), unchecked((int) 0x20000000), unchecked((int) 0x00004010),
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unchecked((int) 0x20000010), unchecked((int) 0x20404010), unchecked((int) 0x00404000), unchecked((int) 0x20400000),
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unchecked((int) 0x00404010), unchecked((int) 0x20404000), unchecked((int) 0x00000000), unchecked((int) 0x20400010),
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unchecked((int) 0x00000010), unchecked((int) 0x00004000), unchecked((int) 0x20400000), unchecked((int) 0x00404010),
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unchecked((int) 0x00004000), unchecked((int) 0x00400010), unchecked((int) 0x20004010), unchecked((int) 0x00000000),
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unchecked((int) 0x20404000), unchecked((int) 0x20000000), unchecked((int) 0x00400010), unchecked((int) 0x20004010)
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};
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private static readonly int[] SP7 =
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{
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unchecked((int) 0x00200000), unchecked((int) 0x04200002), unchecked((int) 0x04000802), unchecked((int) 0x00000000),
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unchecked((int) 0x00000800), unchecked((int) 0x04000802), unchecked((int) 0x00200802), unchecked((int) 0x04200800),
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unchecked((int) 0x04200802), unchecked((int) 0x00200000), unchecked((int) 0x00000000), unchecked((int) 0x04000002),
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unchecked((int) 0x00000002), unchecked((int) 0x04000000), unchecked((int) 0x04200002), unchecked((int) 0x00000802),
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unchecked((int) 0x04000800), unchecked((int) 0x00200802), unchecked((int) 0x00200002), unchecked((int) 0x04000800),
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unchecked((int) 0x04000002), unchecked((int) 0x04200000), unchecked((int) 0x04200800), unchecked((int) 0x00200002),
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unchecked((int) 0x04200000), unchecked((int) 0x00000800), unchecked((int) 0x00000802), unchecked((int) 0x04200802),
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unchecked((int) 0x00200800), unchecked((int) 0x00000002), unchecked((int) 0x04000000), unchecked((int) 0x00200800),
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unchecked((int) 0x04000000), unchecked((int) 0x00200800), unchecked((int) 0x00200000), unchecked((int) 0x04000802),
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unchecked((int) 0x04000802), unchecked((int) 0x04200002), unchecked((int) 0x04200002), unchecked((int) 0x00000002),
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unchecked((int) 0x00200002), unchecked((int) 0x04000000), unchecked((int) 0x04000800), unchecked((int) 0x00200000),
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unchecked((int) 0x04200800), unchecked((int) 0x00000802), unchecked((int) 0x00200802), unchecked((int) 0x04200800),
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unchecked((int) 0x00000802), unchecked((int) 0x04000002), unchecked((int) 0x04200802), unchecked((int) 0x04200000),
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unchecked((int) 0x00200800), unchecked((int) 0x00000000), unchecked((int) 0x00000002), unchecked((int) 0x04200802),
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unchecked((int) 0x00000000), unchecked((int) 0x00200802), unchecked((int) 0x04200000), unchecked((int) 0x00000800),
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unchecked((int) 0x04000002), unchecked((int) 0x04000800), unchecked((int) 0x00000800), unchecked((int) 0x00200002)
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};
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private static readonly int[] SP8 =
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{
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unchecked((int) 0x10001040), unchecked((int) 0x00001000), unchecked((int) 0x00040000), unchecked((int) 0x10041040),
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unchecked((int) 0x10000000), unchecked((int) 0x10001040), unchecked((int) 0x00000040), unchecked((int) 0x10000000),
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unchecked((int) 0x00040040), unchecked((int) 0x10040000), unchecked((int) 0x10041040), unchecked((int) 0x00041000),
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unchecked((int) 0x10041000), unchecked((int) 0x00041040), unchecked((int) 0x00001000), unchecked((int) 0x00000040),
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unchecked((int) 0x10040000), unchecked((int) 0x10000040), unchecked((int) 0x10001000), unchecked((int) 0x00001040),
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unchecked((int) 0x00041000), unchecked((int) 0x00040040), unchecked((int) 0x10040040), unchecked((int) 0x10041000),
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unchecked((int) 0x00001040), unchecked((int) 0x00000000), unchecked((int) 0x00000000), unchecked((int) 0x10040040),
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unchecked((int) 0x10000040), unchecked((int) 0x10001000), unchecked((int) 0x00041040), unchecked((int) 0x00040000),
|
|
unchecked((int) 0x00041040), unchecked((int) 0x00040000), unchecked((int) 0x10041000), unchecked((int) 0x00001000),
|
|
unchecked((int) 0x00000040), unchecked((int) 0x10040040), unchecked((int) 0x00001000), unchecked((int) 0x00041040),
|
|
unchecked((int) 0x10001000), unchecked((int) 0x00000040), unchecked((int) 0x10000040), unchecked((int) 0x10040000),
|
|
unchecked((int) 0x10040040), unchecked((int) 0x10000000), unchecked((int) 0x00040000), unchecked((int) 0x10001040),
|
|
unchecked((int) 0x00000000), unchecked((int) 0x10041040), unchecked((int) 0x00040040), unchecked((int) 0x10000040),
|
|
unchecked((int) 0x10040000), unchecked((int) 0x10001000), unchecked((int) 0x10001040), unchecked((int) 0x00000000),
|
|
unchecked((int) 0x10041040), unchecked((int) 0x00041000), unchecked((int) 0x00041000), unchecked((int) 0x00001040),
|
|
unchecked((int) 0x00001040), unchecked((int) 0x00040040), unchecked((int) 0x10000000), unchecked((int) 0x10041000)
|
|
};
|
|
|
|
/**
|
|
* Generate an integer based working key based on our secret key
|
|
* and what we processing we are planning to do.
|
|
*
|
|
* Acknowledgements for this routine go to James Gillogly and Phil Karn.
|
|
* (whoever, and wherever they are!).
|
|
*/
|
|
protected static int[] GenerateWorkingKey(
|
|
bool encrypting,
|
|
byte[] key)
|
|
{
|
|
int[] newKey = new int[32];
|
|
bool[] pc1m = new bool[56];
|
|
bool[] pcr = new bool[56];
|
|
|
|
for (int j = 0; j < 56; j++ )
|
|
{
|
|
int l = pc1[j];
|
|
|
|
pc1m[j] = ((key[(uint) l >> 3] & bytebit[l & 07]) != 0);
|
|
}
|
|
|
|
for (int i = 0; i < 16; i++)
|
|
{
|
|
int l, m, n;
|
|
|
|
if (encrypting)
|
|
{
|
|
m = i << 1;
|
|
}
|
|
else
|
|
{
|
|
m = (15 - i) << 1;
|
|
}
|
|
|
|
n = m + 1;
|
|
newKey[m] = newKey[n] = 0;
|
|
|
|
for (int j = 0; j < 28; j++)
|
|
{
|
|
l = j + totrot[i];
|
|
if ( l < 28 )
|
|
{
|
|
pcr[j] = pc1m[l];
|
|
}
|
|
else
|
|
{
|
|
pcr[j] = pc1m[l - 28];
|
|
}
|
|
}
|
|
|
|
for (int j = 28; j < 56; j++)
|
|
{
|
|
l = j + totrot[i];
|
|
if (l < 56 )
|
|
{
|
|
pcr[j] = pc1m[l];
|
|
}
|
|
else
|
|
{
|
|
pcr[j] = pc1m[l - 28];
|
|
}
|
|
}
|
|
|
|
for (int j = 0; j < 24; j++)
|
|
{
|
|
if (pcr[pc2[j]])
|
|
{
|
|
newKey[m] |= bigbyte[j];
|
|
}
|
|
|
|
if (pcr[pc2[j + 24]])
|
|
{
|
|
newKey[n] |= bigbyte[j];
|
|
}
|
|
}
|
|
}
|
|
|
|
//
|
|
// store the processed key
|
|
//
|
|
for (int i = 0; i != 32; i += 2)
|
|
{
|
|
int i1, i2;
|
|
|
|
i1 = newKey[i];
|
|
i2 = newKey[i + 1];
|
|
|
|
newKey[i] = (int) ( (uint) ((i1 & 0x00fc0000) << 6) |
|
|
(uint) ((i1 & 0x00000fc0) << 10) |
|
|
((uint) (i2 & 0x00fc0000) >> 10) |
|
|
((uint) (i2 & 0x00000fc0) >> 6));
|
|
|
|
newKey[i + 1] = (int) ( (uint) ((i1 & 0x0003f000) << 12) |
|
|
(uint) ((i1 & 0x0000003f) << 16) |
|
|
((uint) (i2 & 0x0003f000) >> 4) |
|
|
(uint) (i2 & 0x0000003f));
|
|
}
|
|
|
|
return newKey;
|
|
}
|
|
|
|
/**
|
|
* the DES engine.
|
|
*/
|
|
internal static void DesFunc(
|
|
int[] wKey,
|
|
byte[] input,
|
|
int inOff,
|
|
byte[] outBytes,
|
|
int outOff)
|
|
{
|
|
int work, right, left;
|
|
|
|
left = (input[inOff + 0] & 0xff) << 24;
|
|
left |= (input[inOff + 1] & 0xff) << 16;
|
|
left |= (input[inOff + 2] & 0xff) << 8;
|
|
left |= (input[inOff + 3] & 0xff);
|
|
|
|
right = (input[inOff + 4] & 0xff) << 24;
|
|
right |= (input[inOff + 5] & 0xff) << 16;
|
|
right |= (input[inOff + 6] & 0xff) << 8;
|
|
right |= (input[inOff + 7] & 0xff);
|
|
|
|
work = (int) (((uint) left >> 4) ^ right) & unchecked((int) 0x0f0f0f0f);
|
|
right ^= work;
|
|
left ^= (work << 4);
|
|
work = (int) (((uint) left >> 16) ^ right) & unchecked((int) 0x0000ffff);
|
|
right ^= work;
|
|
left ^= (work << 16);
|
|
work = (int) (((uint) right >> 2) ^ left) & unchecked((int) 0x33333333);
|
|
left ^= work;
|
|
right ^= (work << 2);
|
|
work = (int) (((uint) right >> 8) ^ left) & unchecked((int) 0x00ff00ff);
|
|
left ^= work;
|
|
right ^= (work << 8);
|
|
right = (int) ( (uint) (right << 1) |
|
|
( ((uint) right >> 31) & 1 )
|
|
) &
|
|
unchecked((int) 0xffffffff);
|
|
work = (left ^ right) & unchecked((int) 0xaaaaaaaa);
|
|
left ^= work;
|
|
right ^= work;
|
|
left = (int) ( (uint) (left << 1) |
|
|
( ((uint) left >> 31) & 1)) &
|
|
unchecked((int) 0xffffffff);
|
|
|
|
for (int round = 0; round < 8; round++)
|
|
{
|
|
int fval;
|
|
|
|
work = (int) ((uint) (right << 28) | ((uint) right >> 4));
|
|
work ^= wKey[round * 4 + 0];
|
|
fval = SP7[ work & 0x3f];
|
|
fval |= SP5[((uint) work >> 8) & 0x3f];
|
|
fval |= SP3[((uint) work >> 16) & 0x3f];
|
|
fval |= SP1[((uint) work >> 24) & 0x3f];
|
|
work = right ^ wKey[round * 4 + 1];
|
|
fval |= SP8[ work & 0x3f];
|
|
fval |= SP6[((uint) work >> 8) & 0x3f];
|
|
fval |= SP4[((uint) work >> 16) & 0x3f];
|
|
fval |= SP2[((uint) work >> 24) & 0x3f];
|
|
left ^= fval;
|
|
work = (int) ((uint) (left << 28) | ((uint) left >> 4));
|
|
work ^= wKey[round * 4 + 2];
|
|
fval = SP7[ work & 0x3f];
|
|
fval |= SP5[((uint) work >> 8) & 0x3f];
|
|
fval |= SP3[((uint) work >> 16) & 0x3f];
|
|
fval |= SP1[((uint) work >> 24) & 0x3f];
|
|
work = left ^ wKey[round * 4 + 3];
|
|
fval |= SP8[ work & 0x3f];
|
|
fval |= SP6[((uint) work >> 8) & 0x3f];
|
|
fval |= SP4[((uint) work >> 16) & 0x3f];
|
|
fval |= SP2[((uint) work >> 24) & 0x3f];
|
|
right ^= fval;
|
|
}
|
|
|
|
right = (int) ((uint) (right << 31) | ((uint) right >> 1));
|
|
work = (left ^ right) & unchecked((int) 0xaaaaaaaa);
|
|
left ^= work;
|
|
right ^= work;
|
|
left = (int) ((uint) (left << 31) | ((uint) left >> 1));
|
|
work = (int) ((((uint) left >> 8) ^ right) & 0x00ff00ff);
|
|
right ^= work;
|
|
left ^= (work << 8);
|
|
work = (int) ((((uint) left >> 2) ^ right) & 0x33333333);
|
|
right ^= work;
|
|
left ^= (work << 2);
|
|
work = (int) ((((uint) right >> 16) ^ left) & 0x0000ffff);
|
|
left ^= work;
|
|
right ^= (work << 16);
|
|
work = (int) ((((uint) right >> 4) ^ left) & 0x0f0f0f0f);
|
|
left ^= work;
|
|
right ^= (work << 4);
|
|
|
|
outBytes[outOff + 0] = (byte)(((uint) right >> 24) & 0xff);
|
|
outBytes[outOff + 1] = (byte)(((uint) right >> 16) & 0xff);
|
|
outBytes[outOff + 2] = (byte)(((uint) right >> 8) & 0xff);
|
|
outBytes[outOff + 3] = (byte)( right & 0xff);
|
|
outBytes[outOff + 4] = (byte)(((uint) left >> 24) & 0xff);
|
|
outBytes[outOff + 5] = (byte)(((uint) left >> 16) & 0xff);
|
|
outBytes[outOff + 6] = (byte)(((uint) left >> 8) & 0xff);
|
|
outBytes[outOff + 7] = (byte)( left & 0xff);
|
|
}
|
|
}
|
|
}
|