/// <summary>
/// Decrypts the specified ciphertext.
/// </summary>
/// <param name="ciphertext">
/// The ciphertext to decrypt.
/// </param>
/// <param name="key">
/// The cascading key derivation bits and algorithm specifications used to transform the ciphertext.
/// </param>
/// <returns>
/// The resulting plaintext object.
/// </returns>
/// <exception cref="SecurityException">
/// An exception was raised during decryption or deserialization.
/// </exception>
public T Decrypt(Byte[] ciphertext, CascadingSymmetricKey key)
{
try
{
var keys = key.Keys;
var binaryDecryptor = new SymmetricBinaryProcessor(RandomnessProvider);
var buffer = ciphertext;
for (var i = (key.Depth - 1); i > 0; i--)
{
buffer = binaryDecryptor.Decrypt(buffer, keys[i]);
}
return(Decrypt(buffer, keys[0]));
}
catch
{
throw new SecurityException("The decryption operation failed.");
}
}
/// <summary>
/// Encrypts the specified plaintext object.
/// </summary>
/// <param name="plaintextObject">
/// The plaintext object to encrypt.
/// </param>
/// <param name="key">
/// The cascading key derivation bits and algorithm specifications used to transform the object.
/// </param>
/// <returns>
/// The resulting ciphertext.
/// </returns>
/// <exception cref="SecurityException">
/// An exception was raised during encryption or serialization.
/// </exception>
public Byte[] Encrypt(T plaintextObject, CascadingSymmetricKey key)
{
try
{
var keys = key.Keys;
var binaryEncryptor = new SymmetricBinaryProcessor(RandomnessProvider);
var buffer = Encrypt(plaintextObject, keys[0]);
for (var i = 1; i < key.Depth; i++)
{
buffer = binaryEncryptor.Encrypt(buffer, keys[i]);
}
return(buffer);
}
catch
{
throw new SecurityException("The encryption operation failed.");
}
}
