DataProtectionCryptoServiceProvider.UnprotectData Method (Byte[], Int32, Int32, Byte[])

Decrypts data that has been encrypted with the ProtectData method.

[Visual Basic]
Overloads Public Function UnprotectData( _
   ByVal data As Byte(), _
   ByVal offset As Integer, _
   ByVal size As Integer, _
   ByVal entropy As Byte() _
) As Byte()

[C#]
public byte[] UnprotectData(
   byte[] data,
   int offset,
   int size,
   byte[] entropy
);

Parameters

data: The data to decrypt.
offset: The zero-based position in the data parameter at which to begin decrypting.
size: The number of bytes to decrypt.
entropy: Additional entropy to use during the encyption process. This parameter can be set to null.

Return Value

The decrypted data.

Remarks

The entropy used during decryption must be the same as the entropy used during encryption.

Exceptions

Exception Type	Condition
ArgumentNullException	data is a null reference (Nothing in Visual Basic).
ArgumentException	The specified offset or size exceeds the size of buffer.
CryptographicException	An error occurs during the encryption process. Under some circumstances, Microsoft cryptographic service providers may not allow encryption when used in France. This may occur on down-level platforms such as Windows 98 and Windows NT 4.0, depending on the system's configuration and the version of the CSPs.

DataProtectionCryptoServiceProvider.UnprotectData Method (Byte[], Int32, Int32, Byte[])

Parameters

Return Value

Remarks

Exceptions

See Also