private static RijndaelManaged CreateKey(DeriveBytes deriveBytes)
{
var result = new RijndaelManaged {Mode = CipherMode.CBC, Padding = PaddingMode.PKCS7};
result.Key = deriveBytes.GetBytes(result.KeySize / 8);
result.IV = deriveBytes.GetBytes(result.BlockSize / 8);
return result;
}
/// <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;
}
}
/// <summary>
/// Encrypts a byte array
/// </summary>
/// <param name="Data">Data to be encrypted</param>
/// <param name="Key">Password to encrypt with</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>
/// <param name="Algorithm">Algorithm to use</param>
/// <returns>The encrypted byte array</returns>
public byte[] Encrypt(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[] CipherTextBytes = new byte[0];
if (SymmetricKey != null)
{
SymmetricKey.Mode = CipherMode.CBC;
using (ICryptoTransform Encryptor = SymmetricKey.CreateEncryptor(Key.GetBytes(KeySize / 8), InitialVector.ToByteArray()))
{
using (MemoryStream MemStream = new MemoryStream())
{
using (CryptoStream CryptoStream = new CryptoStream(MemStream, Encryptor, CryptoStreamMode.Write))
{
CryptoStream.Write(Data, 0, Data.Length);
CryptoStream.FlushFinalBlock();
CipherTextBytes = MemStream.ToArray();
}
}
}
SymmetricKey.Clear();
}
return CipherTextBytes;
}
}
private static RijndaelManaged GetAesAlgorithm(DeriveBytes bytes)
{
RijndaelManaged aes = new RijndaelManaged();
aes.Mode = CipherMode.CBC;
aes.Key = bytes.GetBytes(aes.KeySize / 8);
aes.IV = bytes.GetBytes(aes.BlockSize / 8);
return aes;
}
