SymmetricAlgorithm.DecryptCfb Method

Definition

Namespace:

System.Security.Cryptography

Assembly:

System.Security.Cryptography.dll

Overloads

DecryptCfb(ReadOnlySpan<Byte>, ReadOnlySpan<Byte>, PaddingMode, Int32)	Decrypts data using CFB mode with the specified padding mode and feedback size.
DecryptCfb(ReadOnlySpan<Byte>, ReadOnlySpan<Byte>, Span<Byte>, PaddingMode, Int32)	Decrypts data into the specified buffer, using CFB mode with the specified padding mode and feedback size.
DecryptCfb(Byte[], Byte[], PaddingMode, Int32)	Decrypts data using CFB mode with the specified padding mode and feedback size.

DecryptCfb(ReadOnlySpan<Byte>, ReadOnlySpan<Byte>, PaddingMode, Int32)

Source:

SymmetricAlgorithm.cs

Decrypts data using CFB mode with the specified padding mode and feedback size.

public byte[] DecryptCfb (ReadOnlySpan<byte> ciphertext, ReadOnlySpan<byte> iv, System.Security.Cryptography.PaddingMode paddingMode = System.Security.Cryptography.PaddingMode.None, int feedbackSizeInBits = 8);

member this.DecryptCfb : ReadOnlySpan<byte> * ReadOnlySpan<byte> * System.Security.Cryptography.PaddingMode * int -> byte[]

Public Function DecryptCfb (ciphertext As ReadOnlySpan(Of Byte), iv As ReadOnlySpan(Of Byte), Optional paddingMode As PaddingMode = System.Security.Cryptography.PaddingMode.None, Optional feedbackSizeInBits As Integer = 8) As Byte()

Parameters

ciphertext

ReadOnlySpan<Byte>

The data to decrypt.

iv

ReadOnlySpan<Byte>

The initialization vector.

paddingMode

PaddingMode

The padding mode used to produce the ciphertext and remove during decryption.

feedbackSizeInBits

Int32

The feedback size, specified in bits.

Returns

Byte[]

The decrypted plaintext data.

Exceptions

ArgumentOutOfRangeException

paddingMode is not a valid padding mode.

-or-

feedbackSizeInBits is not positive or represent a whole number of bytes.

ArgumentException

iv is the incorrect length. Callers are expected to pass an initialization vector that is exactly BlockSize in length, converted to bytes (BlockSize / 8).

CryptographicException

The ciphertext could not be decrypted successfully.

-or-

The feedback size is not valid for the algorithm.

Remarks

This method's behavior is defined by TryDecryptCfbCore(ReadOnlySpan<Byte>, ReadOnlySpan<Byte>, Span<Byte>, PaddingMode, Int32, Int32).

DecryptCfb(ReadOnlySpan<Byte>, ReadOnlySpan<Byte>, Span<Byte>, PaddingMode, Int32)

Source:

SymmetricAlgorithm.cs

Decrypts data into the specified buffer, using CFB mode with the specified padding mode and feedback size.

public int DecryptCfb (ReadOnlySpan<byte> ciphertext, ReadOnlySpan<byte> iv, Span<byte> destination, System.Security.Cryptography.PaddingMode paddingMode = System.Security.Cryptography.PaddingMode.None, int feedbackSizeInBits = 8);

member this.DecryptCfb : ReadOnlySpan<byte> * ReadOnlySpan<byte> * Span<byte> * System.Security.Cryptography.PaddingMode * int -> int

Public Function DecryptCfb (ciphertext As ReadOnlySpan(Of Byte), iv As ReadOnlySpan(Of Byte), destination As Span(Of Byte), Optional paddingMode As PaddingMode = System.Security.Cryptography.PaddingMode.None, Optional feedbackSizeInBits As Integer = 8) As Integer

Parameters

ciphertext

ReadOnlySpan<Byte>

The data to decrypt.

iv

ReadOnlySpan<Byte>

The initialization vector.

destination

Span<Byte>

The buffer to receive the plaintext data.

paddingMode

PaddingMode

The padding mode used to produce the ciphertext and remove during decryption.

feedbackSizeInBits

Int32

The feedback size, specified in bits.

Returns

Int32

The total number of bytes written to destination.

Exceptions

ArgumentOutOfRangeException

paddingMode is not a valid padding mode.

-or-

feedbackSizeInBits is not positive or represent a whole number of bytes.

ArgumentException

iv is the incorrect length. Callers are expected to pass an initialization vector that is exactly BlockSize in length, converted to bytes (BlockSize / 8).

-or-

The buffer in destination is too small to hold the plaintext data.

CryptographicException

The ciphertext could not be decrypted successfully.

-or-

feedbackSizeInBits is not valid for the algorithm.

Remarks

This method's behavior is defined by TryDecryptCfbCore(ReadOnlySpan<Byte>, ReadOnlySpan<Byte>, Span<Byte>, PaddingMode, Int32, Int32).

DecryptCfb(Byte[], Byte[], PaddingMode, Int32)

Source:

SymmetricAlgorithm.cs

Decrypts data using CFB mode with the specified padding mode and feedback size.

public byte[] DecryptCfb (byte[] ciphertext, byte[] iv, System.Security.Cryptography.PaddingMode paddingMode = System.Security.Cryptography.PaddingMode.None, int feedbackSizeInBits = 8);

member this.DecryptCfb : byte[] * byte[] * System.Security.Cryptography.PaddingMode * int -> byte[]

Public Function DecryptCfb (ciphertext As Byte(), iv As Byte(), Optional paddingMode As PaddingMode = System.Security.Cryptography.PaddingMode.None, Optional feedbackSizeInBits As Integer = 8) As Byte()

Parameters

ciphertext

Byte[]

The data to decrypt.

iv

Byte[]

The initialization vector.

paddingMode

PaddingMode

The padding mode used to produce the ciphertext and remove during decryption.

feedbackSizeInBits

Int32

The feedback size, specified in bits.

Returns

Byte[]

The decrypted plaintext data.

Exceptions

ArgumentNullException

ciphertext or iv is null.

ArgumentOutOfRangeException

paddingMode is not a valid padding mode.

-or-

feedbackSizeInBits is not positive or represent a whole number of bytes.

ArgumentException

iv is the incorrect length. Callers are expected to pass an initialization vector that is exactly BlockSize in length, converted to bytes (BlockSize / 8).

CryptographicException

The ciphertext could not be decrypted successfully.

-or-

The feedback size is not valid for the algorithm.

Remarks

This method's behavior is defined by TryDecryptCfbCore(ReadOnlySpan<Byte>, ReadOnlySpan<Byte>, Span<Byte>, PaddingMode, Int32, Int32).