private byte[] _keyBuffer; // The key buffer, used in encryption and decryption.
/// <summary>
/// This cipher is used in the Account Server to decrypt the output of the decryption method for Rivest
/// Cipher 5. The algorithm uses the account name for the player as a key for generating the key vector.
/// This is the last cipher required for decrypting the player's password. The cipher algorithm does not
/// work with num keys. Do not attempt to fix unless your players cannot have special symbols in their
/// passwords.
/// </summary>
/// <param name="account">The player's account name.</param>
public NetDragonPasswordCipher(string account)
{
// Generate the seed for the key generator:
int seed = 0;
foreach (byte character in account)
{
seed += character;
}
GenerateKeys(SeedGenerator.Generate(seed));
}
/// <summary>
/// RC5 is a block cipher notable for its simplicity. Designed by Ronald Rivest in 1994, RC stands for "Rivest
/// Cipher". A key feature of RC5 is the use of data-dependent rotations; one of the goals of RC5 was to prompt
/// the study and evaluation of such operations as a cryptographic primitive. 12-round RC5 (with 64-bit blocks)
/// is susceptible to a differential attack using 2^44 chosen plaintexts. NetDragon Websoft uses 12-round RC5
/// for their password cipher.
/// </summary>
/// <param name="seed">The seed sent to the client in packet 1060 (if patch 5174 and above).</param>
public RivestCipher5(int seed)
{
GenerateKeys(SeedGenerator.Generate(seed));
}
