public static string Decrypt(string orgidata, byte[] key = null, CryptoStringFormat format = CryptoStringFormat.Base64, string iv = null)
{
if (orgidata == null)
{
return null;
}
using (AesCryptoServiceProvider aes = new AesCryptoServiceProvider())
{
key = GetCheckKey(key);
aes.Key = key == null ? appkeykey : key;
byte[] _iv = new byte[aes.BlockSize / 8];
if (string.IsNullOrEmpty(iv))
{
Array.Copy(aes.Key, 0, _iv, 0, _iv.Length);
}
else
{
byte[] pIV = Encoding.GetBytes(iv);
if (pIV.Length == _iv.Length) { _iv = pIV; }
else if (pIV.Length > _iv.Length)
{
Array.Copy(pIV, 0, _iv, 0, _iv.Length);
}
else if (pIV.Length < _iv.Length)
{
Array.Copy(pIV, 0, _iv, 0, pIV.Length);
for (int i = pIV.Length; i < _iv.Length; i++)
{
_iv[i] = 48;
}
}
}
aes.Mode = cipherMode;
aes.Padding = paddingMode;
aes.IV = _iv;
using (ICryptoTransform transform = aes.CreateDecryptor())
{
byte[] data = null;
try
{
byte[] orgi = null;
switch (format)
{
case CryptoStringFormat.Base64:
orgi = Convert.FromBase64String(orgidata);
break;
case CryptoStringFormat.Encoding:
orgi = Encoding.GetBytes(orgidata);
break;
}
data = transform.TransformFinalBlock(orgi, 0, orgi.Length);
}
catch (Exception ex)
{
Log.WriteException(ex);
return null;
}
aes.Clear();
if (data != null)
return Encoding.GetString(data);
return null;
}
}
}
public static string Encrypt(string orgidata, byte[] key = null, CryptoStringFormat format = CryptoStringFormat.Base64, string iv = null)
{
if (orgidata == null)
{
return null;
}
try
{
byte[] orgi = Encoding.GetBytes(orgidata);
using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())
{
des.Key = GetCheckKey(key);
des.IV = string.IsNullOrEmpty(iv) ? _iv : Encoding.GetBytes(iv);
using (ICryptoTransform transform = des.CreateEncryptor())
{
byte[] data = transform.TransformFinalBlock(orgi, 0, orgi.Length);
if (data != null)
{
des.Clear();
switch (format)
{
case CryptoStringFormat.Base64:
return Convert.ToBase64String(data);
case CryptoStringFormat.Encoding:
return Encoding.GetString(data);
}
}
}
}
orgi = null;
}
catch (Exception ex)
{
Log.WriteException(ex);
}
return null;
}
