134 lines
4.6 KiB
C#
134 lines
4.6 KiB
C#
#if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR)
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#pragma warning disable
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using System;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Crypto.Parameters;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Crypto.Utilities;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Utilities;
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namespace BestHTTP.SecureProtocol.Org.BouncyCastle.Crypto.Engines
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{
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/// <remarks>A class that provides a basic DESede (or Triple DES) engine.</remarks>
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public class DesEdeEngine
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: DesEngine
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{
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private int[] workingKey1, workingKey2, workingKey3;
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private bool forEncryption;
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/**
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* initialise a DESede 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 override 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 DESede init - " + Org.BouncyCastle.Utilities.Platform.GetTypeName(parameters));
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byte[] keyMaster = ((KeyParameter)parameters).GetKey();
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if (keyMaster.Length != 24 && keyMaster.Length != 16)
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throw new ArgumentException("key size must be 16 or 24 bytes.");
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this.forEncryption = forEncryption;
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byte[] key1 = new byte[8];
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Array.Copy(keyMaster, 0, key1, 0, key1.Length);
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workingKey1 = GenerateWorkingKey(forEncryption, key1);
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byte[] key2 = new byte[8];
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Array.Copy(keyMaster, 8, key2, 0, key2.Length);
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workingKey2 = GenerateWorkingKey(!forEncryption, key2);
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if (keyMaster.Length == 24)
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{
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byte[] key3 = new byte[8];
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Array.Copy(keyMaster, 16, key3, 0, key3.Length);
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workingKey3 = GenerateWorkingKey(forEncryption, key3);
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}
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else // 16 byte key
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{
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workingKey3 = workingKey1;
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}
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}
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public override string AlgorithmName
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{
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get { return "DESede"; }
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}
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public override int GetBlockSize()
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{
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return BLOCK_SIZE;
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}
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public override int ProcessBlock(byte[] input, int inOff, byte[] output, int outOff)
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{
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if (workingKey1 == null)
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throw new InvalidOperationException("DESede engine not initialised");
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Check.DataLength(input, inOff, BLOCK_SIZE, "input buffer too short");
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Check.OutputLength(output, outOff, BLOCK_SIZE, "output buffer too short");
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uint hi32 = Pack.BE_To_UInt32(input, inOff);
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uint lo32 = Pack.BE_To_UInt32(input, inOff + 4);
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if (forEncryption)
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{
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DesFunc(workingKey1, ref hi32, ref lo32);
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DesFunc(workingKey2, ref hi32, ref lo32);
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DesFunc(workingKey3, ref hi32, ref lo32);
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}
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else
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{
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DesFunc(workingKey3, ref hi32, ref lo32);
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DesFunc(workingKey2, ref hi32, ref lo32);
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DesFunc(workingKey1, ref hi32, ref lo32);
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}
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Pack.UInt32_To_BE(hi32, output, outOff);
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Pack.UInt32_To_BE(lo32, output, outOff + 4);
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return BLOCK_SIZE;
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}
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#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER || _UNITY_2021_2_OR_NEWER_
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public override int ProcessBlock(ReadOnlySpan<byte> input, Span<byte> output)
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{
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if (workingKey1 == null)
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throw new InvalidOperationException("DESede engine not initialised");
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Check.DataLength(input, BLOCK_SIZE, "input buffer too short");
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Check.OutputLength(output, BLOCK_SIZE, "output buffer too short");
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uint hi32 = Pack.BE_To_UInt32(input);
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uint lo32 = Pack.BE_To_UInt32(input[4..]);
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if (forEncryption)
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{
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DesFunc(workingKey1, ref hi32, ref lo32);
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DesFunc(workingKey2, ref hi32, ref lo32);
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DesFunc(workingKey3, ref hi32, ref lo32);
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}
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else
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{
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DesFunc(workingKey3, ref hi32, ref lo32);
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DesFunc(workingKey2, ref hi32, ref lo32);
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DesFunc(workingKey1, ref hi32, ref lo32);
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}
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Pack.UInt32_To_BE(hi32, output);
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Pack.UInt32_To_BE(lo32, output[4..]);
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return BLOCK_SIZE;
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}
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#endif
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}
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}
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#pragma warning restore
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#endif
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