AsymmetricKeyExchangeDeformatter.DecryptKeyExchange(Byte[]) Method
Definition
Important
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When overridden in a derived class, extracts secret information from the encrypted key exchange data.
public:
abstract cli::array <System::Byte> ^ DecryptKeyExchange(cli::array <System::Byte> ^ rgb);public abstract byte[] DecryptKeyExchange (byte[] rgb);abstract member DecryptKeyExchange : byte[] -> byte[]Public MustOverride Function DecryptKeyExchange (rgb As Byte()) As Byte()Parameters
- rgb
- Byte[]
The key exchange data within which the secret information is hidden.
Returns
The secret information derived from the key exchange data.
Examples
The following code example demonstrates how to override the DecryptKeyExchange method to create an encrypted key exchange for the specified input data. This code example is part of a larger example provided for the AsymmetricKeyExchangeDeformatter class.
// Create the encrypted key exchange data from the specified input
// data. This method uses the RSA class only. To
// support additional providers or provide custom decryption logic,
// add logic to this member.
public override byte[] DecryptKeyExchange(byte[] rgbData)
{
byte[] decryptedBytes = null;
if (_rsaKey != null)
{
if (_rsaKey is RSA rsa)
{
decryptedBytes = rsa.Decrypt(rgbData, RSAEncryptionPadding.OaepSHA1);
}
// Add custom decryption logic here.
}
else
{
throw new CryptographicUnexpectedOperationException(
"Cryptography_MissingKey");
}
return decryptedBytes;
}
' Create the encrypted key exchange data from the specified input
' data. This method uses the RSA class only. To
' support additional providers or provide custom decryption logic,
' add logic to this member.
Public Overrides Function DecryptKeyExchange(
ByVal rgbData() As Byte) As Byte()
Dim decryptedBytes() As Byte
If (Not rsaKey Is Nothing) Then
If (TypeOf (rsaKey) Is RSA) Then
Dim rsa As RSA
rsa = CType(rsaKey, RSA)
decryptedBytes = rsa.Decrypt(rgbData, RSAEncryptionPadding.OaepSHA1)
End If
' Add custom decryption logic here.
Else
Throw New CryptographicUnexpectedOperationException(
"Cryptography_MissingKey")
End If
Return decryptedBytes
End Function
Remarks
You must specify a key before calling an implementation of this method.
