AES Algorithm:
public static class CryptographyProvider
{
public static string EncryptString(string plainText, out string Key)
{
if (plainText == null || plainText.Length <= 0)
throw new ArgumentNullException("plainText");
using (Aes _aesAlg = Aes.Create())
{
Key = Convert.ToBase64String(_aesAlg.Key);
ICryptoTransform _encryptor = _aesAlg.CreateEncryptor(_aesAlg.Key, _aesAlg.IV);
using (MemoryStream _memoryStream = new MemoryStream())
{
_memoryStream.Write(_aesAlg.IV, 0, 16);
using (CryptoStream _cryptoStream = new CryptoStream(_memoryStream, _encryptor, CryptoStreamMode.Write))
{
using (StreamWriter _streamWriter = new StreamWriter(_cryptoStream))
{
_streamWriter.Write(plainText);
}
return Convert.ToBase64String(_memoryStream.ToArray());
}
}
}
}
public static string DecryptString(string cipherText, string Key)
{
if (string.IsNullOrEmpty(cipherText))
throw new ArgumentNullException("cipherText");
if (string.IsNullOrEmpty(Key))
throw new ArgumentNullException("Key");
string plaintext = null;
byte[] _initialVector = new byte[16];
byte[] _Key = Convert.FromBase64String(Key);
byte[] _cipherTextBytesArray = Convert.FromBase64String(cipherText);
byte[] _originalString = new byte[_cipherTextBytesArray.Length - 16];
Array.Copy(_cipherTextBytesArray, 0, _initialVector, 0, _initialVector.Length);
Array.Copy(_cipherTextBytesArray, 16, _originalString, 0, _cipherTextBytesArray.Length - 16);
using (Aes _aesAlg = Aes.Create())
{
_aesAlg.Key = _Key;
_aesAlg.IV = _initialVector;
ICryptoTransform decryptor = _aesAlg.CreateDecryptor(_aesAlg.Key, _aesAlg.IV);
using (MemoryStream _memoryStream = new MemoryStream(_originalString))
{
using (CryptoStream _cryptoStream = new CryptoStream(_memoryStream, decryptor, CryptoStreamMode.Read))
{
using (StreamReader _streamReader = new StreamReader(_cryptoStream))
{
plaintext = _streamReader.ReadToEnd();
}
}
}
}
return plaintext;
}
}