/// <summary>
/// Decrypts a string.
/// </summary>
/// <param name="cipherString">The encrypted string.</param>
/// <param name="password">Password to create key with</param>
/// <param name="salt">Salt to create key with</param>
/// <param name="iv">IV</param>
/// <param name="keySize">Can be 128, 192, or 256</param>
/// <param name="iterationCount">The number of iterations to derive the key.</param>
/// <returns>The decrypted string.</returns>
public static string Decrypt(string cipherString, string password, string salt, string iv,
Bytes.KeySize keySize, int iterationCount)
{
if (string.IsNullOrEmpty(cipherString))
{
throw new ArgumentNullException(nameof(cipherString));
}
if (string.IsNullOrEmpty(password))
{
throw new ArgumentNullException(nameof(password));
}
if (string.IsNullOrEmpty(salt))
{
throw new ArgumentNullException(nameof(salt));
}
if (string.IsNullOrEmpty(iv))
{
throw new ArgumentNullException(nameof(iv));
}
var keyBytes = Bytes.GenerateKey(password, salt, keySize, iterationCount);
var ivBytes = Encoding.UTF8.GetBytes(iv);
return(Decrypt(cipherString, keyBytes, ivBytes));
}
public void Encrypt_decrypt_using_different_key_sizes(Bytes.KeySize keySize)
{
const string password = "******";
const string salt = "saltsaltsalt";
var iv = string.Empty.PadLeft(32, '#');
const string original = "My secret text";
var encrypted = Strings.Encrypt(original, password, salt, iv, keySize, 1);
var decrypted = Strings.Decrypt(encrypted, password, salt, iv, keySize, 1);
Assert.AreEqual(original, decrypted);
}
/// <summary>
/// Encrypts a string. The password, salt and keySize are all used to generate a key see Bytes.GenerateKey().
/// The iv is converted into a byte array using Encoding.UTF8.GetBytes(iv).
/// The other Encrypt() function is then called using the clearString, keyBytes and ivBytes.
/// </summary>
/// <param name="clearString">The plain text string.</param>
/// <param name="password">Password to create key with</param>
/// <param name="salt">Salt to create key with</param>
/// <param name="iv">IV</param>
/// <param name="keySize">Can be 128, 192, or 256</param>
/// <param name="iterationCount">The number of iterations to derive the key.</param>
/// <returns>The encrypted string.</returns>
public static string Encrypt(string clearString, string password, string salt, string iv, Bytes.KeySize keySize, int iterationCount)
{
if (string.IsNullOrEmpty(clearString))
{
throw new ArgumentNullException("clearString");
}
if (string.IsNullOrEmpty(password))
{
throw new ArgumentNullException("password");
}
if (string.IsNullOrEmpty(salt))
{
throw new ArgumentNullException("salt");
}
if (string.IsNullOrEmpty(iv))
{
throw new ArgumentNullException("iv");
}
byte[] keyBytes = Bytes.GenerateKey(password, salt, keySize, iterationCount);
byte[] ivBytes = Encoding.UTF8.GetBytes(iv);
return(Encrypt(clearString, keyBytes, ivBytes));
}
