/// <summary>
/// Decripta un buffer utilizzando una chiave ed un algoritmo forniti
/// </summary>
/// <param name="algorithm"></param>
/// <param name="key"></param>
/// <param name="input"></param>
/// <returns></returns>
public static byte[] Decrypt(Encryptor.Algorithm algorithm, string key, byte[] input)
{
byte[] buffkey = generateByteString(key);
byte[] buff_iv = buffkey;
return(Decrypt(algorithm, buffkey, buff_iv, input));
}
/// <summary>
/// Decripta un testo in base 64 utilizzando una chiave ed un algoritmo forniti
/// </summary>
/// <param name="algorithm"></param>
/// <param name="key"></param>
/// <param name="inputb64"></param>
/// <returns></returns>
public static string DecryptFromBase64String(Encryptor.Algorithm algorithm, string key, string inputb64)
{
byte[] buffkey = generateByteString(key);
byte[] buff_iv = buffkey;
byte[] buff_input = Convert.FromBase64String(inputb64);
return(Encoding.UTF8.GetString(Decrypt(algorithm, buffkey, buff_iv, buff_input)));
}
/// <summary>
/// Cripta un testo in base 64 utilizzando una chiave ed un algoritmo forniti
/// </summary>
/// <param name="algorithm"></param>
/// <param name="key"></param>
/// <param name="input"></param>
/// <returns></returns>
public static string EncryptToBase64String(Encryptor.Algorithm algorithm, string key, string input)
{
byte[] buffkey = generateByteString(key);
byte[] buff_iv = buffkey;
byte[] buff_input = generateByteString(input);
return(Convert.ToBase64String(Encrypt(algorithm, buffkey, buff_iv, buff_input)));
}
/// <summary>
/// Decripta un buffer utilizzando una chiave, un IV ed un algoritmo forniti
/// </summary>
/// <param name="algorithm"></param>
/// <param name="key"></param>
/// <param name="iv"></param>
/// <param name="input"></param>
/// <returns></returns>
public static byte[] Decrypt(Encryptor.Algorithm algorithm, byte[] key, byte[] iv, byte[] input)
{
try
{
//Crea algoritmo
SymmetricAlgorithm oAlgo = getAlgorithm(algorithm);
//Esegue validazione Key
checkAlgoKey(oAlgo, key);
//Decrypt
return(Transform(input, oAlgo.CreateDecryptor(key, iv)));
}
catch (Exception ex)
{
throw new ApplicationException(string.Concat("Si e' verificato un errore durante l'operazione di decrypt: ", ex.Message));
}
}
/// <summary>
/// Crea algoritmo a partire dalla definizione
/// </summary>
/// <param name="algorithm"></param>
/// <returns></returns>
private static SymmetricAlgorithm getAlgorithm(Encryptor.Algorithm algorithm)
{
switch (algorithm)
{
case Algorithm.DES:
return(DESCryptoServiceProvider.Create());
case Algorithm.RC2:
return(RC2CryptoServiceProvider.Create());
case Algorithm.Rijndael:
return(RijndaelManaged.Create());
case Algorithm.TripleDES:
return(TripleDESCryptoServiceProvider.Create());
default:
break;
}
//Default
return(null);
}
