C# Crypter et Décrypter

public static class Encrypt
{
 // This size of the IV (in bytes) must = (keysize / 8). Default keysize is 256, so the IV must be
 // 32 bytes long. Using a 16 character string here gives us 32 bytes when converted to a byte array.
 private const string initVector = "Bibliogeek";
 // This constant is used to determine the keysize of the encryption algorithm
 private const int keysize = 256;
 //Encrypt
 public static string EncryptString(string plainText, string passPhrase)
 {
 byte[] initVectorBytes = Encoding.UTF8.GetBytes(initVector);
 byte[] plainTextBytes = Encoding.UTF8.GetBytes(plainText);
 PasswordDeriveBytes password = new PasswordDeriveBytes(passPhrase, null);
 byte[] keyBytes = password.GetBytes(keysize / 8);
 RijndaelManaged symmetricKey = new RijndaelManaged();
 symmetricKey.Mode = CipherMode.CBC;
 ICryptoTransform encryptor = symmetricKey.CreateEncryptor(keyBytes, initVectorBytes);
 MemoryStream memoryStream = new MemoryStream();
 CryptoStream cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write);
 cryptoStream.Write(plainTextBytes, 0, plainTextBytes.Length);
 cryptoStream.FlushFinalBlock();
 byte[] cipherTextBytes = memoryStream.ToArray();
 memoryStream.Close();
 cryptoStream.Close();
 return Convert.ToBase64String(cipherTextBytes);
 }
 //Decrypt
 public static string DecryptString(string cipherText, string passPhrase)
 {
 byte[] initVectorBytes = Encoding.UTF8.GetBytes(initVector);
 byte[] cipherTextBytes = Convert.FromBase64String(cipherText);
 PasswordDeriveBytes password = new PasswordDeriveBytes(passPhrase, null);
 byte[] keyBytes = password.GetBytes(keysize / 8);
 RijndaelManaged symmetricKey = new RijndaelManaged();
 symmetricKey.Mode = CipherMode.CBC;
 ICryptoTransform decryptor = symmetricKey.CreateDecryptor(keyBytes, initVectorBytes);
 MemoryStream memoryStream = new MemoryStream(cipherTextBytes);
 CryptoStream cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read);
 byte[] plainTextBytes = new byte[cipherTextBytes.Length];
 int decryptedByteCount = cryptoStream.Read(plainTextBytes, 0, plainTextBytes.Length);
 memoryStream.Close();
 cryptoStream.Close();
 return Encoding.UTF8.GetString(plainTextBytes, 0, decryptedByteCount);
 }
}

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