/// <summary>
/// Encrypt data using MapleStory's AES method
/// </summary>
/// <param name="IV">IV to use for encryption</param>
/// <param name="data">data to encrypt</param>
/// <param name="length">length of data</param>
/// <param name="key">the AES key to use</param>
/// <returns>Crypted data</returns>
public static byte[] AESCrypt(byte[] IV, byte[] data, int length, byte[] key)
{
AesManaged crypto = new AesManaged {
KeySize = 256, //in bits
Key = key,
Mode = CipherMode.ECB // Should be OFB, but this works too
};
MemoryStream memStream = new MemoryStream();
CryptoStream cryptoStream = new CryptoStream(memStream, crypto.CreateEncryptor(), CryptoStreamMode.Write);
int remaining = length;
int llength = 0x5B0;
int start = 0;
while (remaining > 0)
{
byte[] myIV = MapleCrypto.multiplyBytes(IV, 4, 4);
if (remaining < llength)
{
llength = remaining;
}
for (int x = start; x < (start + llength); x++)
{
if ((x - start) % myIV.Length == 0)
{
cryptoStream.Write(myIV, 0, myIV.Length);
byte[] newIV = memStream.ToArray();
Array.Copy(newIV, myIV, myIV.Length);
memStream.Position = 0;
}
data[x] ^= myIV[(x - start) % myIV.Length];
}
start += llength;
remaining -= llength;
llength = 0x5B4;
}
try
{
cryptoStream.Dispose();
memStream.Dispose();
}
catch (Exception e)
{
Helpers.ErrorLogger.Log(Helpers.ErrorLevel.Critical, "Error disposing AES streams" + e);
//Console.WriteLine("Error disposing AES streams" + e);
}
return(data);
}
/// <summary>
/// Encrypt data using MapleStory's AES method
/// </summary>
/// <param name="pIV">IV to use for encryption</param>
/// <param name="pData">data to encrypt</param>
/// <param name="pLength">length of data</param>
/// <param name="pKey">the AES key to use</param>
/// <returns>Crypted data</returns>
public static byte[] aesCrypt(byte[] pIV, byte[] pData, int pLength, byte[] pKey)
{
AesManaged crypto = new AesManaged {
KeySize = 256, Key = pKey, Mode = CipherMode.ECB
};
MemoryStream memStream = new MemoryStream();
CryptoStream cryptoStream = new CryptoStream(memStream, crypto.CreateEncryptor(), CryptoStreamMode.Write);
int remaining = pLength;
int llength = 0x5B0;
int start = 0;
while (remaining > 0)
{
byte[] myIV = MapleCrypto.multiplyBytes(pIV, 4, 4);
if (remaining < llength)
{
llength = remaining;
}
for (int x = start; x < (start + llength); x++)
{
if ((x - start) % myIV.Length == 0)
{
cryptoStream.Write(myIV, 0, myIV.Length);
byte[] newIV = memStream.ToArray();
Array.Copy(newIV, myIV, myIV.Length);
memStream.Position = 0;
}
pData[x] ^= myIV[(x - start) % myIV.Length];
}
start += llength;
remaining -= llength;
llength = 0x5B4;
}
try {
cryptoStream.Dispose();
memStream.Dispose();
} catch (Exception e) {
Console.WriteLine("Error disposing AES streams" + e);
}
return(pData);
}