/// <summary>
/// Caso a string não possa ser descriptografada uma exceção será gerada.
/// </summary>
/// <param name="encryptedText">Texto criptografado usando Encrypt</param>
/// <param name="SaltKey">Chave pública de criptografia</param>
/// <returns>string</returns>
public static string Decrypt(string encryptedText, string SaltKey)
{
#region .: PEX Validation :.
if (HelperText.IsNullOrEmptyOrWhiteSpace(encryptedText))
{
return(string.Empty);
}
if (HelperText.IsNullOrEmptyOrWhiteSpace(SaltKey))
{
return(string.Empty);
}
if (SaltKey.Length < 8)
{
return(string.Empty);
}
#endregion
byte[] cipherTextBytes = Convert.FromBase64String(encryptedText);
byte[] keyBytes = new Rfc2898DeriveBytes(PasswordHash, Encoding.ASCII.GetBytes(SaltKey)).GetBytes(256 / 8);
var symmetricKey = new RijndaelManaged()
{
Mode = CipherMode.CBC, Padding = PaddingMode.None
};
var decryptor = symmetricKey.CreateDecryptor(keyBytes, Encoding.ASCII.GetBytes(VIKey));
int decryptedByteCount = 0;
byte[] plainTextBytes = null;
using (var memoryStream = new MemoryStream(cipherTextBytes))
{
var cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read);
plainTextBytes = new byte[cipherTextBytes.Length];
decryptedByteCount = cryptoStream.Read(plainTextBytes, 0, plainTextBytes.Length);
}
return(Encoding.UTF8.GetString(plainTextBytes, 0, decryptedByteCount).TrimEnd("\0".ToCharArray()));
}
/// <summary>
///
/// </summary>
/// <param name="plainText">Textoa ser criptografado</param>
/// <param name="SaltKey">Chave pública de criptografia</param>
/// <returns>string</returns>
public static string Encrypt(string plainText, string SaltKey)
{
#region .: PEX Validation :.
if (HelperText.IsNullOrEmptyOrWhiteSpace(plainText))
{
return(string.Empty);
}
if (HelperText.IsNullOrEmptyOrWhiteSpace(SaltKey))
{
return(string.Empty);
}
if (SaltKey.Length < 8)
{
return(string.Empty);
}
#endregion
byte[] plainTextBytes = Encoding.UTF8.GetBytes(plainText);
byte[] cipherTextBytes;
byte[] keyBytes = new Rfc2898DeriveBytes(PasswordHash, Encoding.ASCII.GetBytes(SaltKey)).GetBytes(256 / 8);
var symmetricKey = new RijndaelManaged()
{
Mode = CipherMode.CBC, Padding = PaddingMode.Zeros
};
var encryptor = symmetricKey.CreateEncryptor(keyBytes, Encoding.ASCII.GetBytes(VIKey));
using (var memoryStream = new MemoryStream())
{
var cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write);
cryptoStream.Write(plainTextBytes, 0, plainTextBytes.Length);
cryptoStream.FlushFinalBlock();
cipherTextBytes = memoryStream.ToArray();
}
return(Convert.ToBase64String(cipherTextBytes));
}