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   1 // Licensed to the .NET Foundation under one or more agreements.
   2 // The .NET Foundation licenses this file to you under the MIT license.
   3
   4 using Internal.Cryptography;
   5
   6 namespace System.Security.Cryptography
   7 {
   8     internal sealed partial class DesImplementation
   9     {
  10         private static UniversalCryptoTransform CreateTransformCore(
  11             CipherMode cipherMode,
  12             PaddingMode paddingMode,
  13             byte[] key,
  14             byte[]? iv,
  15             int blockSize,
  16             int feedbackSize,
  17             int paddingSize,
  18             bool encrypting)
  19         {
  20             // The algorithm pointer is a static pointer, so not having any cleanup code is correct.
  21             IntPtr algorithm = GetAlgorithm(cipherMode, feedbackSize);
  22
  23             Interop.Crypto.EnsureLegacyAlgorithmsRegistered();
  24
  25             BasicSymmetricCipher cipher = new OpenSslCipher(algorithm, cipherMode, blockSize, paddingSize, key, iv, encrypting);
  26             return UniversalCryptoTransform.Create(paddingMode, cipher, encrypting);
  27         }
  28
  29         private static ILiteSymmetricCipher CreateLiteCipher(
  30             CipherMode cipherMode,
  31             ReadOnlySpan<byte> key,
  32             ReadOnlySpan<byte> iv,
  33             int blockSize,
  34             int feedbackSize,
  35             int paddingSize,
  36             bool encrypting)
  37         {
  38             // The algorithm pointer is a static pointer, so not having any cleanup code is correct.
  39             IntPtr algorithm = GetAlgorithm(cipherMode, feedbackSize);
  40
  41             Interop.Crypto.EnsureLegacyAlgorithmsRegistered();
  42             return new OpenSslCipherLite(algorithm, blockSize, paddingSize, key, iv, encrypting);
  43         }
  44
  45         private static IntPtr GetAlgorithm(CipherMode cipherMode, int feedbackSize)
  46         {
  47             return cipherMode switch
  48             {
  49                 CipherMode.CBC => Interop.Crypto.EvpDesCbc(),
  50                 CipherMode.ECB => Interop.Crypto.EvpDesEcb(),
  51                 CipherMode.CFB when feedbackSize == 1 => Interop.Crypto.EvpDesCfb8(),
  52                 _ => throw new NotSupportedException(),
  53             };
  54         }
  55     }
  56 }