private bool DecryptRC4WithKey(KerberosKey key, RC4KeyUsage key_usage, out byte[] decrypted)
{
HMACMD5 hmac = new HMACMD5(key.Key);
byte[] key1 = hmac.ComputeHash(BitConverter.GetBytes((int)key_usage));
hmac = new HMACMD5(key1);
byte[] checksum = new byte[16];
Buffer.BlockCopy(CipherText, 0, checksum, 0, checksum.Length);
byte[] key2 = hmac.ComputeHash(checksum);
byte[] result = ARC4.Transform(CipherText, 16, CipherText.Length - 16, key2);
hmac = new HMACMD5(key1);
byte[] calculated_checksum = hmac.ComputeHash(result);
decrypted = new byte[result.Length - 8];
Buffer.BlockCopy(result, 8, decrypted, 0, decrypted.Length);
return(NtObjectUtils.EqualByteArray(checksum, calculated_checksum));
}
public bool Equals(KerberosKey x, KerberosKey y)
{
if (x.Version != y.Version)
{
return(false);
}
if (!x.Principal.Equals(y.Principal, StringComparison.OrdinalIgnoreCase))
{
return(false);
}
if (x.NameType != y.NameType)
{
return(false);
}
if (x.KeyEncryption != y.KeyEncryption)
{
return(false);
}
if (!NtObjectUtils.EqualByteArray(x.Key, y.Key))
{
return(false);
}
return(true);
}