/// <summary>
/// Decrypts a byte array
/// </summary>
/// <param name="Data">Data to be decrypted</param>
/// <param name="Key">Password to decrypt with</param>
/// <param name="Algorithm">Algorithm to use for decryption</param>
/// <param name="InitialVector">Needs to be 16 ASCII characters long</param>
/// <param name="KeySize">
/// Can be 64 (DES only), 128 (AES), 192 (AES and Triple DES), or 256 (AES)
/// </param>
/// <returns>A decrypted byte array</returns>
public byte[] Decrypt(byte[] Data, DeriveBytes Key, string Algorithm = "AES", string InitialVector = "OFRna73m*aze01xY", int KeySize = 256)
{
if (string.IsNullOrEmpty(InitialVector))
{
throw new ArgumentNullException(nameof(InitialVector));
}
if (Data == null)
{
return(null);
}
using (SymmetricAlgorithm SymmetricKey = GetProvider(Algorithm))
{
byte[] PlainTextBytes = new byte[0];
if (SymmetricKey != null)
{
SymmetricKey.Mode = CipherMode.CBC;
using (ICryptoTransform Decryptor = SymmetricKey.CreateDecryptor(Key.GetBytes(KeySize / 8), InitialVector.ToByteArray()))
{
using (MemoryStream MemStream = new MemoryStream(Data))
{
using (CryptoStream CryptoStream = new CryptoStream(MemStream, Decryptor, CryptoStreamMode.Read))
{
PlainTextBytes = CryptoStream.ReadAllBinary();
}
}
}
SymmetricKey.Clear();
}
return(PlainTextBytes);
}
}
public static byte[] Decrypt(this byte[] data,
DeriveBytes key,
SymmetricAlgorithm algorithmUsing = null,
string initialVector = "OFRna73m*aze01xY",
int keySize = 256)
{
if (data.IsNull())
{
return(null);
}
algorithmUsing = algorithmUsing.NullCheck(() => new RijndaelManaged());
Guard.NotEmpty(initialVector, "initialVector");
using (DeriveBytes derivedPassword = key)
{
using (SymmetricAlgorithm symmetricKey = algorithmUsing)
{
symmetricKey.Mode = CipherMode.CBC;
byte[] plainTextBytes;
using (
ICryptoTransform decryptor = symmetricKey.CreateDecryptor(derivedPassword.GetBytes(keySize / 8),
initialVector.ToByteArray()))
{
using (var memStream = new MemoryStream(data))
{
using (var cryptoStream = new CryptoStream(memStream, decryptor, CryptoStreamMode.Read))
{
plainTextBytes = cryptoStream.ReadAllBinary();
}
}
}
symmetricKey.Clear();
return(plainTextBytes);
}
}
}
/// <summary>
/// Decrypts a byte array
/// </summary>
/// <param name="Data">Data to encrypt</param>
/// <param name="Key">Key to use to encrypt the data (can use PasswordDeriveBytes, Rfc2898DeriveBytes, etc. Really anything that implements DeriveBytes)</param>
/// <param name="AlgorithmUsing">Algorithm to use for encryption (defaults to AES)</param>
/// <param name="InitialVector">Needs to be 16 ASCII characters long</param>
/// <param name="KeySize">Can be 64 (DES only), 128 (AES), 192 (AES and Triple DES), or 256 (AES)</param>
/// <returns>An encrypted byte array</returns>
public static byte[] Decrypt(this byte[] Data,
DeriveBytes Key,
SymmetricAlgorithm AlgorithmUsing = null,
string InitialVector = "OFRna73m*aze01xY",
int KeySize = 256)
{
if (Data.IsNull())
{
return(null);
}
AlgorithmUsing = AlgorithmUsing.NullCheck(new RijndaelManaged());
InitialVector.ThrowIfNullOrEmpty("InitialVector");
using (DeriveBytes DerivedPassword = Key)
{
using (SymmetricAlgorithm SymmetricKey = AlgorithmUsing)
{
SymmetricKey.Mode = CipherMode.CBC;
byte[] PlainTextBytes = null;
using (ICryptoTransform Decryptor = SymmetricKey.CreateDecryptor(DerivedPassword.GetBytes(KeySize / 8), InitialVector.ToByteArray()))
{
using (MemoryStream MemStream = new MemoryStream(Data))
{
using (CryptoStream CryptoStream = new CryptoStream(MemStream, Decryptor, CryptoStreamMode.Read))
{
PlainTextBytes = CryptoStream.ReadAllBinary();
MemStream.Close();
CryptoStream.Close();
}
}
}
SymmetricKey.Clear();
return(PlainTextBytes);
}
}
}
/// <summary>
/// Decrypts the specified data.
/// </summary>
/// <param name="data">The data.</param>
/// <param name="key">The key.</param>
/// <param name="keySize">
/// Size of the key. Can be 64 (DES only), 128 (AES), 192 (AES and Triple DES), or 256 (AES)
/// </param>
/// <returns>The decrypted data.</returns>
public byte[] Decrypt(byte[] data, PasswordDeriveBytes key, byte[] initialVector, int keySize)
{
using SymmetricAlgorithm SymmetricKey = GetAlgorithm();
byte[] PlainTextBytes = Array.Empty <byte>();
if (SymmetricKey != null)
{
SymmetricKey.Mode = CipherMode.CBC;
using (ICryptoTransform Decryptor = SymmetricKey.CreateDecryptor(key.GetBytes(keySize / 8), initialVector))
{
using MemoryStream MemStream = new MemoryStream(data);
using CryptoStream CryptoStream = new CryptoStream(MemStream, Decryptor, CryptoStreamMode.Read);
PlainTextBytes = CryptoStream.ReadAllBinary();
}
SymmetricKey.Clear();
}
return(PlainTextBytes);
}