public static string Decrypt(byte[] cypherText, string cnxString)
{
using (AesManaged aes = new AesManaged())
{
AESUtilityInfo p = ReadParams(cnxString: cnxString);
ICryptoTransform decryptor = aes.CreateDecryptor(p.Key, p.IV);
using (MemoryStream msDecrypt = new MemoryStream(cypherText))
{
using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
{
using (StreamReader swDecrypt = new StreamReader(csDecrypt)) // utf-8
{
return(swDecrypt.ReadToEnd());
}
}
}
}
}
public static byte[] Encrypt(string clearText, string cnxString)
{
using (AesManaged aes = new AesManaged())
{
byte[] tmpKey;
byte[] tmpIV;
AESUtilityInfo p = ReadParams(cnxString: cnxString);
if (p == null)
{
tmpKey = aes.Key;
tmpIV = aes.IV;
PersistParams(aes.Key, aes.IV, cnxString: cnxString);
}
else
{
tmpKey = p.Key;
tmpIV = p.IV;
}
ICryptoTransform encryptor = aes.CreateEncryptor(tmpKey, tmpIV);
using (MemoryStream msEncrypt = new MemoryStream())
{
using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
{
using (StreamWriter swEncrypt = new StreamWriter(csEncrypt)) // utf-8
{
swEncrypt.Write(clearText);
}
return(msEncrypt.ToArray());
}
}
}
}
