public static string DecryptRijndael(string ivEncrypted, string key, out bool candecrypt)
{
AesCryptoServiceProvider aes = null;
candecrypt = false;
string encrypted = ivEncrypted.Length >= GX_AJAX_PRIVATE_IV.Length ? ivEncrypted.Substring(GX_AJAX_PRIVATE_IV.Length) : ivEncrypted;
try
{
int discarded = 0;
byte[] encryptedBytes = HexEncoding.GetBytes(encrypted, out discarded);
if (encryptedBytes.Length > 0)
{
byte[] keyBytes = HexEncoding.GetBytes(key, out discarded);
byte[] ivBytes = HexEncoding.GetBytes(GX_AJAX_PRIVATE_IV, out discarded);
aes = new AesCryptoServiceProvider(); //CBC Mode
aes.IV = ivBytes;
aes.Key = keyBytes;
aes.Padding = PaddingMode.Zeros;
MemoryStream memoryStream;
using (memoryStream = new MemoryStream(encryptedBytes))
{
CryptoStream cryptoStream;
using (cryptoStream = new CryptoStream(memoryStream, aes.CreateDecryptor(), CryptoStreamMode.Write))
{
cryptoStream.Write(encryptedBytes, 0, encryptedBytes.Length);
}
}
string decrypted = Encoding.ASCII.GetString(memoryStream.ToArray());
int zeroIdx = decrypted.IndexOf(NULL_CHARACTER);
if (zeroIdx != -1)
{
decrypted = decrypted.Substring(0, zeroIdx);
}
candecrypt = true;
return(decrypted);
}
}
catch (Exception) { }
finally
{
if (aes != null)
{
aes.Clear();
}
}
return(encrypted);
}
public static string EncryptRijndael(string decrypted, string key)
{
AesCryptoServiceProvider aes = null;
string encrypted = null;
try
{
int discarded = 0;
byte[] decryptedBytes = Encoding.ASCII.GetBytes(decrypted);
byte[] keyBytes = HexEncoding.GetBytes(key, out discarded);
byte[] ivBytes = HexEncoding.GetBytes(GX_AJAX_PRIVATE_IV, out discarded);
aes = new AesCryptoServiceProvider(); //CBC Mode
aes.IV = ivBytes;
aes.Key = keyBytes;
aes.Padding = PaddingMode.Zeros;
MemoryStream memoryStream;
using (memoryStream = new MemoryStream())
{
CryptoStream cryptoStream;
using (cryptoStream = new CryptoStream(memoryStream, aes.CreateEncryptor(), CryptoStreamMode.Write))
{
cryptoStream.Write(decryptedBytes, 0, decryptedBytes.Length);
cryptoStream.FlushFinalBlock();
encrypted = HexEncoding.ToString(memoryStream.ToArray());
int zeroIdx = encrypted.IndexOf(NULL_CHARACTER);
if (zeroIdx != -1)
{
encrypted = encrypted.Substring(0, zeroIdx);
}
}
}
return(encrypted);
}
catch (Exception) {
}
finally
{
if (aes != null)
{
aes.Clear();
}
}
return(decrypted);
}