By Pavol Cerven
This crucial source for software program builders highlights the susceptible issues in "well-protected" software program, indicates how crackers holiday universal defense schemes, and the way to safeguard opposed to crackers. comprises in-depth discussions of anti-debugging and anti-disassembling.
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3 was called: ReadWord(). All other services will be called in this way. Let's look at the most important and frequently used functions. Function no. 1: IsHasp() This function is always called first. It considers whether the hardware key is attached. Simply changing the return value of this service will absolutely not overcome HASP. Input values: • BH = 01 • BL = LPT port Return values: • EAX = 0 — Hardware key wasn't found • or • EAX = 1 — Hardware key was found Function no. 2: HaspCode () This function is usually called right after the IsHasp() function.
In recent versions, the ASPack programmers have focused on dumping the program from memory in an effort to protect the import table as much as possible. They seem to have forgotten, though, that without good antidebugging tricks and anti−disassembling macros, it is very easy to trace and view the ASPack code, so it will not take long before a new decompressor appears. 3) is another commonly used executable file encoder. It's particularly interesting because it implements anti−debugging tricks designed to make it impossible to run an encoded program when a debugger is present in memory.
51: WriteBlock() This function writes a memory block into HASP. The address from which the reading will be performed is located in EDI. The block length to be written is located in ESI, and the address from which the data to be written will be read is located in ES:EAX. To learn the actual address into which the writing will be performed, you must multiply the address in EDI by two, since the data is written by words. info • BH = 51 or 33 • BL = LPT port • ECX = password1 • EDX = password2 • EDI = start address • ESI = data block length • ES = buffer segment • EAX = buffer offset Return values: ECX = status 0 — Correct, otherwise there was an error (you can find the error description in HASP documentation) Naturally, HASP uses other functions besides the ones just discussed, including functions such as: SetTime(), GetTime(), SetDate(), GetDate(), Writebyte(), and Readbyte().