private byte[] DecryptValue(byte[] encryptedValue, byte[] iv)
{
using (RijndaelManaged rijndael = new RijndaelManaged())
{
rijndael.BlockSize = 128;
rijndael.Mode = CipherMode.CBC;
rijndael.Padding = PaddingMode.None;
using (ICryptoTransform decryptor = rijndael.CreateDecryptor(_encryptionKey, iv))
using (MemoryStream decryptedStream = new MemoryStream())
using (CryptoStream cryptoStream = new CryptoStream(decryptedStream, decryptor, CryptoStreamMode.Write))
{
cryptoStream.Write(encryptedValue, 0, encryptedValue.Length);
return(PadUtils.Unpad(decryptedStream.ToArray(), 0));
}
}
}
private byte[] EncryptIV(byte[] iv)
{
byte[] paddedIV = PadUtils.Pad(iv, 16, 0);
using (RijndaelManaged rijndael = new RijndaelManaged())
{
rijndael.BlockSize = 128;
rijndael.Mode = CipherMode.ECB;
rijndael.Padding = PaddingMode.None;
using (ICryptoTransform encryptor = rijndael.CreateEncryptor(_encryptionKey, null))
using (MemoryStream encryptedStream = new MemoryStream(paddedIV.Length * 2))
using (CryptoStream cryptoStream = new CryptoStream(encryptedStream, encryptor, CryptoStreamMode.Write))
{
cryptoStream.Write(paddedIV, 0, paddedIV.Length);
return(encryptedStream.ToArray());
}
}
}
private byte[] EncryptValue(byte[] value, out byte[] iv)
{
byte[] paddedValue = PadUtils.Pad(value, 16, 0);
using (RijndaelManaged rijndael = new RijndaelManaged())
{
rijndael.BlockSize = 128;
rijndael.Mode = CipherMode.CBC;
rijndael.Padding = PaddingMode.None;
rijndael.GenerateIV();
using (ICryptoTransform encryptor = rijndael.CreateEncryptor(_encryptionKey, rijndael.IV))
using (MemoryStream encryptedStream = new MemoryStream(paddedValue.Length * 2))
using (CryptoStream cryptoStream = new CryptoStream(encryptedStream, encryptor, CryptoStreamMode.Write))
{
cryptoStream.Write(paddedValue, 0, paddedValue.Length);
iv = rijndael.IV;
return(encryptedStream.ToArray());
}
}
}
