# < Summary

Information

Class: | Renci.SshNet.Security.Cryptography.Ciphers.TripleDesCipher
Assembly: | Renci.SshNet
File(s): | \home\appveyor\projects\ssh-net\src\Renci.SshNet\Security\Cryptography\Ciphers\TripleDesCipher.cs

Line coverage
77%

Covered lines: | 55
Uncovered lines: | 16
Coverable lines: | 71
Total lines: | 154
Line coverage: | 77.4%

Branch coverage
73%

Covered branches: | 22
Total branches: | 30
Branch coverage: | 73.3%

Method coverage

Feature is only available for sponsors

Upgrade to PRO version

# Metrics

Method | Branch coverage | Cyclomatic complexity | Line coverage
--- | --- | --- | ---
.ctor(...) | 100% | 1 | 100%
EncryptBlock(...) | 75% | 12 | 77.41%
DecryptBlock(...) | 75% | 12 | 77.41%
ValidateKey() | 66.66% | 6 | 66.66%

# File(s)

## \home\appveyor\projects\ssh-net\src\Renci.SshNet\Security\Cryptography\Ciphers\TripleDesCipher.cs

| # | Line |  | Line coverage
--- | --- | --- | --- | ---
|  | `1` |  | `using System;`
|  | `2` |  | ``
|  | `3` |  | `namespace Renci.SshNet.Security.Cryptography.Ciphers`
|  | `4` |  | `{`
|  | `5` |  | `/// <summary>`
|  | `6` |  | `/// Implements 3DES cipher algorithm.`
|  | `7` |  | `/// </summary>`
|  | `8` |  | `public sealed class TripleDesCipher : DesCipher`
|  | `9` |  | `{`
|  | `10` |  | `private int[] _encryptionKey1;`
|  | `11` |  | `private int[] _encryptionKey2;`
|  | `12` |  | `private int[] _encryptionKey3;`
|  | `13` |  | `private int[] _decryptionKey1;`
|  | `14` |  | `private int[] _decryptionKey2;`
|  | `15` |  | `private int[] _decryptionKey3;`
|  | `16` |  | ``
|  | `17` |  | `/// <summary>`
|  | `18` |  | `/// Initializes a new instance of the <see cref="TripleDesCipher"/> class.`
|  | `19` |  | `/// </summary>`
|  | `20` |  | `/// <param name="key">The key.</param>`
|  | `21` |  | `/// <param name="mode">The mode.</param>`
|  | `22` |  | `/// <param name="padding">The padding.</param>`
|  | `23` |  | `/// <exception cref="ArgumentNullException"><paramref name="key"/> is <see langword="null"/>.</exception>`
|  | `24` |  | `public TripleDesCipher(byte[] key, CipherMode mode, CipherPadding padding)`
| 25 | `25` |  | `: base(key, mode, padding)`
| 25 | `26` |  | `{`
| 25 | `27` |  | `}`
|  | `28` |  | ``
|  | `29` |  | `/// <summary>`
|  | `30` |  | `/// Encrypts the specified region of the input byte array and copies the encrypted data to the specified region`
|  | `31` |  | `/// </summary>`
|  | `32` |  | `/// <param name="inputBuffer">The input data to encrypt.</param>`
|  | `33` |  | `/// <param name="inputOffset">The offset into the input byte array from which to begin using data.</param>`
|  | `34` |  | `/// <param name="inputCount">The number of bytes in the input byte array to use as data.</param>`
|  | `35` |  | `/// <param name="outputBuffer">The output to which to write encrypted data.</param>`
|  | `36` |  | `/// <param name="outputOffset">The offset into the output byte array from which to begin writing data.</param>`
|  | `37` |  | `/// <returns>`
|  | `38` |  | `/// The number of bytes encrypted.`
|  | `39` |  | `/// </returns>`
|  | `40` |  | `public override int EncryptBlock(byte[] inputBuffer, int inputOffset, int inputCount, byte[] outputBuffer, int o`
| 539 | `41` |  | `{`
| 539 | `42` |  | `if ((inputOffset + BlockSize) > inputBuffer.Length)`
| 0 | `43` |  | `{`
| 0 | `44` |  | `throw new ArgumentException("input buffer too short");`
|  | `45` |  | `}`
|  | `46` |  | ``
| 539 | `47` |  | `if ((outputOffset + BlockSize) > outputBuffer.Length)`
| 0 | `48` |  | `{`
| 0 | `49` |  | `throw new ArgumentException("output buffer too short");`
|  | `50` |  | `}`
|  | `51` |  | ``
| 539 | `52` |  | `if (_encryptionKey1 is null || _encryptionKey2 is null || _encryptionKey3 is null)`
| 9 | `53` |  | `{`
| 9 | `54` |  | `var part1 = new byte[8];`
| 9 | `55` |  | `var part2 = new byte[8];`
|  | `56` |  | ``
| 9 | `57` |  | `Buffer.BlockCopy(Key, 0, part1, 0, 8);`
| 9 | `58` |  | `Buffer.BlockCopy(Key, 8, part2, 0, 8);`
|  | `59` |  | ``
| 9 | `60` |  | `_encryptionKey1 = GenerateWorkingKey(encrypting: true, part1);`
| 9 | `61` |  | `_encryptionKey2 = GenerateWorkingKey(encrypting: false, part2);`
|  | `62` |  | ``
| 9 | `63` |  | `if (Key.Length == 24)`
| 9 | `64` |  | `{`
| 9 | `65` |  | `var part3 = new byte[8];`
| 9 | `66` |  | `Buffer.BlockCopy(Key, 16, part3, 0, 8);`
|  | `67` |  | ``
| 9 | `68` |  | `_encryptionKey3 = GenerateWorkingKey(encrypting: true, part3);`
| 9 | `69` |  | `}`
|  | `70` |  | `else`
| 0 | `71` |  | `{`
| 0 | `72` |  | `_encryptionKey3 = _encryptionKey1;`
| 0 | `73` |  | `}`
| 9 | `74` |  | `}`
|  | `75` |  | ``
| 539 | `76` |  | `var temp = new byte[BlockSize];`
|  | `77` |  | ``
| 539 | `78` |  | `DesFunc(_encryptionKey1, inputBuffer, inputOffset, temp, 0);`
| 539 | `79` |  | `DesFunc(_encryptionKey2, temp, 0, temp, 0);`
| 539 | `80` |  | `DesFunc(_encryptionKey3, temp, 0, outputBuffer, outputOffset);`
|  | `81` |  | ``
| 539 | `82` |  | `return BlockSize;`
| 539 | `83` |  | `}`
|  | `84` |  | ``
|  | `85` |  | `/// <summary>`
|  | `86` |  | `/// Decrypts the specified region of the input byte array and copies the decrypted data to the specified region`
|  | `87` |  | `/// </summary>`
|  | `88` |  | `/// <param name="inputBuffer">The input data to decrypt.</param>`
|  | `89` |  | `/// <param name="inputOffset">The offset into the input byte array from which to begin using data.</param>`
|  | `90` |  | `/// <param name="inputCount">The number of bytes in the input byte array to use as data.</param>`
|  | `91` |  | `/// <param name="outputBuffer">The output to which to write decrypted data.</param>`
|  | `92` |  | `/// <param name="outputOffset">The offset into the output byte array from which to begin writing data.</param>`
|  | `93` |  | `/// <returns>`
|  | `94` |  | `/// The number of bytes decrypted.`
|  | `95` |  | `/// </returns>`
|  | `96` |  | `public override int DecryptBlock(byte[] inputBuffer, int inputOffset, int inputCount, byte[] outputBuffer, int o`
| 1618 | `97` |  | `{`
| 1618 | `98` |  | `if ((inputOffset + BlockSize) > inputBuffer.Length)`
| 0 | `99` |  | `{`
| 0 | `100` |  | `throw new ArgumentException("input buffer too short");`
|  | `101` |  | `}`
|  | `102` |  | ``
| 1618 | `103` |  | `if ((outputOffset + BlockSize) > outputBuffer.Length)`
| 0 | `104` |  | `{`
| 0 | `105` |  | `throw new ArgumentException("output buffer too short");`
|  | `106` |  | `}`
|  | `107` |  | ``
| 1618 | `108` |  | `if (_decryptionKey1 is null || _decryptionKey2 is null || _decryptionKey3 is null)`
| 16 | `109` |  | `{`
| 16 | `110` |  | `var part1 = new byte[8];`
| 16 | `111` |  | `var part2 = new byte[8];`
|  | `112` |  | ``
| 16 | `113` |  | `Buffer.BlockCopy(Key, 0, part1, 0, 8);`
| 16 | `114` |  | `Buffer.BlockCopy(Key, 8, part2, 0, 8);`
|  | `115` |  | ``
| 16 | `116` |  | `_decryptionKey1 = GenerateWorkingKey(encrypting: false, part1);`
| 16 | `117` |  | `_decryptionKey2 = GenerateWorkingKey(encrypting: true, part2);`
|  | `118` |  | ``
| 16 | `119` |  | `if (Key.Length == 24)`
| 16 | `120` |  | `{`
| 16 | `121` |  | `var part3 = new byte[8];`
| 16 | `122` |  | `Buffer.BlockCopy(Key, 16, part3, 0, 8);`
|  | `123` |  | ``
| 16 | `124` |  | `_decryptionKey3 = GenerateWorkingKey(encrypting: false, part3);`
| 16 | `125` |  | `}`
|  | `126` |  | `else`
| 0 | `127` |  | `{`
| 0 | `128` |  | `_decryptionKey3 = _decryptionKey1;`
| 0 | `129` |  | `}`
| 16 | `130` |  | `}`
|  | `131` |  | ``
| 1618 | `132` |  | `var temp = new byte[BlockSize];`
|  | `133` |  | ``
| 1618 | `134` |  | `DesFunc(_decryptionKey3, inputBuffer, inputOffset, temp, 0);`
| 1618 | `135` |  | `DesFunc(_decryptionKey2, temp, 0, temp, 0);`
| 1618 | `136` |  | `DesFunc(_decryptionKey1, temp, 0, outputBuffer, outputOffset);`
|  | `137` |  | ``
| 1618 | `138` |  | `return BlockSize;`
| 1618 | `139` |  | `}`
|  | `140` |  | ``
|  | `141` |  | `/// <summary>`
|  | `142` |  | `/// Validates the key.`
|  | `143` |  | `/// </summary>`
|  | `144` |  | `protected override void ValidateKey()`
| 75 | `145` |  | `{`
| 75 | `146` |  | `var keySize = Key.Length * 8;`
|  | `147` |  | ``
| 75 | `148` |  | `if (keySize is not (128 or 128 + 64))`
| 0 | `149` |  | `{`
| 0 | `150` |  | `throw new ArgumentException(string.Format("KeySize '{0}' is not valid for this algorithm.", keySize));`
|  | `151` |  | `}`
| 75 | `152` |  | `}`
|  | `153` |  | `}`
|  | `154` |  | `}`

# Methods/Properties

.ctor(System.Byte[],Renci.SshNet.Security.Cryptography.Ciphers.CipherMode,Renci.SshNet.Security.Cryptography.Ciphers.CipherPadding)
EncryptBlock(System.Byte[],System.Int32,System.Int32,System.Byte[],System.Int32)
DecryptBlock(System.Byte[],System.Int32,System.Int32,System.Byte[],System.Int32)
ValidateKey()