# < Summary

Information

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

Line coverage
88%

Covered lines: | 61
Uncovered lines: | 8
Coverable lines: | 69
Total lines: | 171
Line coverage: | 88.4%

Branch coverage
81%

Covered branches: | 18
Total branches: | 22
Branch coverage: | 81.8%

Method coverage

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# Metrics

Method | Branch coverage | Cyclomatic complexity | Line coverage
--- | --- | --- | ---
get_MinimumSize() | 100% | 1 | 100%
get_BlockSize() | 100% | 1 | 100%
.ctor(...) | 100% | 2 | 100%
Encrypt(...) | 80% | 10 | 85.71%
Decrypt(...) | 100% | 1 | 100%
Decrypt(...) | 80% | 10 | 85.18%

# File(s)

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

| # | Line |  | Line coverage
--- | --- | --- | --- | ---
|  | `1` |  | `using System;`
|  | `2` |  | `using Renci.SshNet.Security.Cryptography.Ciphers;`
|  | `3` |  | ``
|  | `4` |  | `namespace Renci.SshNet.Security.Cryptography`
|  | `5` |  | `{`
|  | `6` |  | `/// <summary>`
|  | `7` |  | `/// Base class for block cipher implementations.`
|  | `8` |  | `/// </summary>`
|  | `9` |  | `public abstract class BlockCipher : SymmetricCipher`
|  | `10` |  | `{`
|  | `11` |  | `private readonly CipherMode _mode;`
|  | `12` |  | ``
|  | `13` |  | `private readonly CipherPadding _padding;`
|  | `14` |  | ``
|  | `15` |  | `/// <summary>`
|  | `16` |  | `/// Gets the size of the block in bytes.`
|  | `17` |  | `/// </summary>`
|  | `18` |  | `/// <value>`
|  | `19` |  | `/// The size of the block in bytes.`
|  | `20` |  | `/// </value>`
|  | `21` |  | `private readonly byte _blockSize;`
|  | `22` |  | ``
|  | `23` |  | `/// <summary>`
|  | `24` |  | `/// Gets the minimum data size.`
|  | `25` |  | `/// </summary>`
|  | `26` |  | `/// <value>`
|  | `27` |  | `/// The minimum data size.`
|  | `28` |  | `/// </value>`
|  | `29` |  | `public override byte MinimumSize`
|  | `30` |  | `{`
| 303537 | `31` |  | `get { return BlockSize; }`
|  | `32` |  | `}`
|  | `33` |  | ``
|  | `34` |  | `/// <summary>`
|  | `35` |  | `/// Gets the size of the block.`
|  | `36` |  | `/// </summary>`
|  | `37` |  | `/// <value>`
|  | `38` |  | `/// The size of the block.`
|  | `39` |  | `/// </value>`
|  | `40` |  | `public byte BlockSize`
|  | `41` |  | `{`
|  | `42` |  | `get`
| 555470 | `43` |  | `{`
| 555470 | `44` |  | `return _blockSize;`
| 555470 | `45` |  | `}`
|  | `46` |  | `}`
|  | `47` |  | ``
|  | `48` |  | `/// <summary>`
|  | `49` |  | `/// Initializes a new instance of the <see cref="BlockCipher"/> class.`
|  | `50` |  | `/// </summary>`
|  | `51` |  | `/// <param name="key">The key.</param>`
|  | `52` |  | `/// <param name="blockSize">Size of the block.</param>`
|  | `53` |  | `/// <param name="mode">Cipher mode.</param>`
|  | `54` |  | `/// <param name="padding">Cipher padding.</param>`
|  | `55` |  | `/// <exception cref="ArgumentNullException"><paramref name="key"/> is <see langword="null"/>.</exception>`
|  | `56` |  | `protected BlockCipher(byte[] key, byte blockSize, CipherMode mode, CipherPadding padding)`
| 5517 | `57` |  | `: base(key)`
| 5517 | `58` |  | `{`
| 5517 | `59` |  | `_blockSize = blockSize;`
| 5517 | `60` |  | `_mode = mode;`
| 5517 | `61` |  | `_padding = padding;`
|  | `62` |  | ``
| 5517 | `63` |  | `_mode?.Init(this);`
| 5517 | `64` |  | `}`
|  | `65` |  | ``
|  | `66` |  | `/// <summary>`
|  | `67` |  | `/// Encrypts the specified data.`
|  | `68` |  | `/// </summary>`
|  | `69` |  | `/// <param name="input">The data.</param>`
|  | `70` |  | `/// <param name="offset">The zero-based offset in <paramref name="input"/> at which to begin encrypting.</param>`
|  | `71` |  | `/// <param name="length">The number of bytes to encrypt from <paramref name="input"/>.</param>`
|  | `72` |  | `/// <returns>`
|  | `73` |  | `/// The encrypted data.`
|  | `74` |  | `/// </returns>`
|  | `75` |  | `public override byte[] Encrypt(byte[] input, int offset, int length)`
| 77 | `76` |  | `{`
| 77 | `77` |  | `if (length % _blockSize > 0)`
| 3 | `78` |  | `{`
| 3 | `79` |  | `if (_padding is null)`
| 0 | `80` |  | `{`
| 0 | `81` |  | `throw new ArgumentException("data");`
|  | `82` |  | `}`
|  | `83` |  | ``
| 3 | `84` |  | `var paddingLength = _blockSize - (length % _blockSize);`
| 3 | `85` |  | `input = _padding.Pad(input, offset, length, paddingLength);`
| 3 | `86` |  | `length += paddingLength;`
| 3 | `87` |  | `offset = 0;`
| 3 | `88` |  | `}`
|  | `89` |  | ``
| 77 | `90` |  | `var output = new byte[length];`
| 77 | `91` |  | `var writtenBytes = 0;`
|  | `92` |  | ``
| 1040 | `93` |  | `for (var i = 0; i < length / _blockSize; i++)`
| 443 | `94` |  | `{`
| 443 | `95` |  | `if (_mode is null)`
| 3 | `96` |  | `{`
| 3 | `97` |  | `writtenBytes += EncryptBlock(input, offset + (i * _blockSize), _blockSize, output, i * _blockSize);`
| 3 | `98` |  | `}`
|  | `99` |  | `else`
| 440 | `100` |  | `{`
| 440 | `101` |  | `writtenBytes += _mode.EncryptBlock(input, offset + (i * _blockSize), _blockSize, output, i * _blockS`
| 440 | `102` |  | `}`
| 443 | `103` |  | `}`
|  | `104` |  | ``
| 77 | `105` |  | `if (writtenBytes < length)`
| 0 | `106` |  | `{`
| 0 | `107` |  | `throw new InvalidOperationException("Encryption error.");`
|  | `108` |  | `}`
|  | `109` |  | ``
| 77 | `110` |  | `return output;`
| 77 | `111` |  | `}`
|  | `112` |  | ``
|  | `113` |  | `/// <summary>`
|  | `114` |  | `/// Decrypts the specified data.`
|  | `115` |  | `/// </summary>`
|  | `116` |  | `/// <param name="input">The data.</param>`
|  | `117` |  | `/// <returns>`
|  | `118` |  | `/// The decrypted data.`
|  | `119` |  | `/// </returns>`
|  | `120` |  | `public override byte[] Decrypt(byte[] input)`
| 52841 | `121` |  | `{`
| 52841 | `122` |  | `return Decrypt(input, 0, input.Length);`
| 52841 | `123` |  | `}`
|  | `124` |  | ``
|  | `125` |  | `/// <summary>`
|  | `126` |  | `/// Decrypts the specified input.`
|  | `127` |  | `/// </summary>`
|  | `128` |  | `/// <param name="input">The input.</param>`
|  | `129` |  | `/// <param name="offset">The zero-based offset in <paramref name="input"/> at which to begin decrypting.</param>`
|  | `130` |  | `/// <param name="length">The number of bytes to decrypt from <paramref name="input"/>.</param>`
|  | `131` |  | `/// <returns>`
|  | `132` |  | `/// The decrypted data.`
|  | `133` |  | `/// </returns>`
|  | `134` |  | `public override byte[] Decrypt(byte[] input, int offset, int length)`
| 128 | `135` |  | `{`
| 128 | `136` |  | `if (length % _blockSize > 0)`
| 6 | `137` |  | `{`
| 6 | `138` |  | `if (_padding is null)`
| 0 | `139` |  | `{`
| 0 | `140` |  | `throw new ArgumentException("data");`
|  | `141` |  | `}`
|  | `142` |  | ``
| 6 | `143` |  | `input = _padding.Pad(_blockSize, input, offset, length);`
| 6 | `144` |  | `offset = 0;`
| 6 | `145` |  | `length = input.Length;`
| 6 | `146` |  | `}`
|  | `147` |  | ``
| 128 | `148` |  | `var output = new byte[length];`
|  | `149` |  | ``
| 128 | `150` |  | `var writtenBytes = 0;`
| 5070 | `151` |  | `for (var i = 0; i < length / _blockSize; i++)`
| 2407 | `152` |  | `{`
| 2407 | `153` |  | `if (_mode is null)`
| 3 | `154` |  | `{`
| 3 | `155` |  | `writtenBytes += DecryptBlock(input, offset + (i * _blockSize), _blockSize, output, i * _blockSize);`
| 3 | `156` |  | `}`
|  | `157` |  | `else`
| 2404 | `158` |  | `{`
| 2404 | `159` |  | `writtenBytes += _mode.DecryptBlock(input, offset + (i * _blockSize), _blockSize, output, i * _blockS`
| 2404 | `160` |  | `}`
| 2407 | `161` |  | `}`
|  | `162` |  | ``
| 128 | `163` |  | `if (writtenBytes < length)`
| 0 | `164` |  | `{`
| 0 | `165` |  | `throw new InvalidOperationException("Encryption error.");`
|  | `166` |  | `}`
|  | `167` |  | ``
| 128 | `168` |  | `return output;`
| 128 | `169` |  | `}`
|  | `170` |  | `}`
|  | `171` |  | `}`

# Methods/Properties

get_MinimumSize()
get_BlockSize()
.ctor(System.Byte[],System.Byte,Renci.SshNet.Security.Cryptography.Ciphers.CipherMode,Renci.SshNet.Security.Cryptography.Ciphers.CipherPadding)
Encrypt(System.Byte[],System.Int32,System.Int32)
Decrypt(System.Byte[])
Decrypt(System.Byte[],System.Int32,System.Int32)