SymmetricAlgorithm.TryDecryptCfb Method

Definition

Namespace:

System.Security.Cryptography

Assembly:

System.Security.Cryptography.dll

Source:

SymmetricAlgorithm.cs

Attempts to decrypt data into the specified buffer, using CFB mode with the specified padding mode and feedback size.

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

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

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

Parameters

ciphertext

ReadOnlySpan<Byte>

The data to decrypt.

iv

ReadOnlySpan<Byte>

The initialization vector.

destination

Span<Byte>

The buffer to receive the plaintext data.

bytesWritten

Int32

When this method returns, contains the total number of bytes written to destination.

paddingMode

PaddingMode

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

feedbackSizeInBits

Int32

The feedback size, specified in bits.

Returns

Boolean

true if destination was large enough to receive the decrypted data; otherwise, false.

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-

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).