/// <summary>
/// Simple Encryption (AES) then Authentication (HMAC) of a UTF8 message
/// using Keys derived from a Password (PBKDF2).
/// </summary>
/// <param name="secretMessage">The secret message.</param>
/// <param name="password">The password.</param>
/// <param name="nonSecretPayload">The non secret payload.</param>
/// <returns>
/// Encrypted Message
/// </returns>
/// <exception cref="System.ArgumentException">password</exception>
/// <remarks>
/// Significantly less secure than using random binary keys.
/// Adds additional non secret payload for key generation parameters.
/// </remarks>
public static string SimpleEncryptWithPassword(string secretMessage, string password, byte[] nonSecretPayload = null)
{
ExceptionCore ex = new ExceptionCore();
if (string.IsNullOrEmpty(secretMessage))
{
//ex.EncryptException("Dados para encryptação é NULL", 1);
throw new ArgumentException("Secret Message Required!", "secretMessage");
}
var plainText = Encoding.UTF8.GetBytes(secretMessage);
var cipherText = SimpleEncryptWithPassword(plainText, password, nonSecretPayload);
return(Convert.ToBase64String(cipherText));
}
/// <summary>
/// Simple Authentication (HMAC) and then Descryption (AES) of a UTF8 Message
/// using keys derived from a password (PBKDF2).
/// </summary>
/// <param name="encryptedMessage">The encrypted message.</param>
/// <param name="password">The password.</param>
/// <param name="nonSecretPayloadLength">Length of the non secret payload.</param>
/// <returns>
/// Decrypted Message
/// </returns>
/// <exception cref="System.ArgumentException">Encrypted Message Required!;encryptedMessage</exception>
/// <remarks>
/// Significantly less secure than using random binary keys.
/// </remarks>
public static string SimpleDecryptWithPassword(string encryptedMessage, string password,
int nonSecretPayloadLength = 0)
{
ExceptionCore ex = new ExceptionCore();
if (string.IsNullOrWhiteSpace(encryptedMessage))
{
ex.EncryptException("Dados para decodificação é NULL", 2);//throw new ArgumentException("Encrypted Message Required!", "encryptedMessage");
}
var cipherText = Convert.FromBase64String(encryptedMessage);
var plainText = SimpleDecryptWithPassword(cipherText, password, nonSecretPayloadLength);
return(plainText == null ? null : Encoding.UTF8.GetString(plainText));
}
