ApplyModifierToKeyPrim
procedure ApplyModifierToKeyPrim (Modifier : LongInt; var Key; KeySize : Cardinal);

ApplyModifierToKeyPrim Xor's the Modifier value with the Key returning the modified key as the Key parameter.

Use this routine to sign a key.

KeySize if the size of the key in bytes

This routine is defined in the OnGuard unit. (as of 1.15 this routine has been moved to the OgUtil unit)