Thank you for the suggestion GargoyleMT, but I think I have located the problem. I downloaded the ShadowDC source code and stepped through the code (which btw is not the same as the VB6 code posted earlier in the thread).
For the lock key:
nOAUDpO*0v=e694+&\fUKe>>N[V2m_<w8Mt5, Pk=[YABBA-0.9.70]U2
ShadowDC's response is:
'àACóV¡d´…5ð�ñ�§£3áâµ/%DCN000%/Q�Fõ#6´ôW“‘
My response is:
'àACóV¡d´?5ð�ñ�¢?áâµ/%DCN000%/Q�Fõ#6´ôW??
Instead of §£ my response has ¢? and instead of ' at the end mine has ? ... what on earth?? Anyway, here is the code (C#), maybe somebody can spot the mistake.
Code: Select all
public static string GetValidationKey(string lockString) {
// The lock command is of the format "$Lock <lock> Pk=<pk>" and we are only interested in <lock>
lockString = lockString.Substring(0, lockString.IndexOf(" "));
// The lock string as a byte array
byte[] lockAsBytes = System.Text.UTF8Encoding.UTF8.GetBytes(lockString);
// The string builder that will build the validation key
StringBuilder validationKeyBuilder = new StringBuilder();
// A temporary byte variable used to keep all the intermediate states of the validation key's bytes
int byteAsInt;
// The first key character is calculated from the first lock character and the last two lock characters and 5
byteAsInt = lockAsBytes[0] ^ lockAsBytes[lockAsBytes.Length - 1] ^ lockAsBytes[lockAsBytes.Length - 2] ^ 5;
// Every character in the key must be nibble-swapped
byteAsInt = ((byteAsInt << 4) & 240) | ((byteAsInt >> 4) & 15);
/*byteAsInt = (byteAsInt / 16) ^ (byteAsInt * 16);
while (byteAsInt > 255) {
byteAsInt -= 256;
}*/
// Append it to the response
AppendByte(byteAsInt, ref validationKeyBuilder);
// Except for the first, each <key> character is computed from the corresponding <lock> character and the one before it
for (int i = 1; i < lockAsBytes.Length; i++) {
byteAsInt = lockAsBytes[i] ^ lockAsBytes[i -1];
// Every character in the key must be nibble-swapped
byteAsInt = ((byteAsInt << 4) & 240) | ((byteAsInt >> 4) & 15);
/*byteAsInt = (byteAsInt / 16) ^ (byteAsInt * 16);
while (byteAsInt > 255) {
byteAsInt -= 256;
}*/
// Append it to the response
AppendByte(byteAsInt, ref validationKeyBuilder);
}
return validationKeyBuilder.ToString();
}
