public AESObfuscator(byte[] salt, string password)
{
try {
SecretKeyFactory factory = SecretKeyFactory.GetInstance(KEYGEN_ALGORITHM);
PBEKeySpec keySpec =
new PBEKeySpec(password.ToCharArray(), salt, 1024, 256);
ISecretKey tmp = factory.GenerateSecret(keySpec);
ISecretKey secret = new SecretKeySpec(tmp.GetEncoded(), "AES");
mEncryptor = Cipher.GetInstance(CIPHER_ALGORITHM);
mEncryptor.Init(Cipher.EncryptMode, secret, new IvParameterSpec(IV));
mDecryptor = Cipher.GetInstance(CIPHER_ALGORITHM);
mDecryptor.Init(Cipher.DecryptMode, secret, new IvParameterSpec(IV));
} catch (GeneralSecurityException e) {
// This can't happen on a compatible Android device.
throw new RuntimeException("Invalid environment", e);
}
}
/// <summary>
/// Initializes the cipher if it has not yet been initialized.
/// </summary>
/// <param name="mode">The mode.</param>
/// <param name="iv">The iv.</param>
/// <param name="cipher">The cipher.</param>
/// <exception cref="System.ArgumentException">
/// Invalid algorithm parameter.
/// </exception>
/// <exception cref="System.NotSupportedException">Algorithm not supported.</exception>
private void InitializeCipher(CipherMode mode, byte[] iv, ref Cipher cipher)
{
try
{
bool newCipher = false;
if (cipher == null)
{
cipher = Cipher.GetInstance(this.GetCipherAcquisitionName().ToString());
newCipher = true;
}
if (this.algorithm.IsBlockCipher() || newCipher)
{
iv = this.ThisOrDefaultIV(iv);
using (var ivspec = iv != null ? new IvParameterSpec(iv) : null)
{
cipher.Init(mode, this.key, ivspec);
}
}
}
catch (InvalidKeyException ex)
{
throw new ArgumentException(ex.Message, ex);
}
catch (NoSuchAlgorithmException ex)
{
throw new NotSupportedException("Algorithm not supported.", ex);
}
catch (InvalidAlgorithmParameterException ex)
{
throw new ArgumentException("Invalid algorithm parameter.", ex);
}
}