Hello all,

I want to implement kind of executable protection using "software guards" (*) - when function (caller) decrypts another function (callee) before calling it and encrypts it again after callee returns. As a result I need to get addresses of my functions (where the asm code starts and ends in the executable). Is there some way to export such info to external file while fpc compiles executable (or maybe afterwards to get this info from executable)?
Any suggenstions would be appreciated!

(*) J. Cappaert, N. Kisserli, D. Schellekens, B. Preneel. "Self-encrypting Code to Protect Against Analysis and Tampering", 2006 (https://www.cosic.esat.kuleuven.be/publications/article-811.pdf)

Regards
Žilvinas Ledas

Žilvinas Ledas wrote

I want to implement kind of executable protection using "software guards" (*) - when function (caller) decrypts another function (callee) before calling it and encrypts it again after callee returns. As a result I need to get addresses of my functions (where the asm code starts and ends in the executable). Is there some way to export such info to external file while fpc compiles executable (or maybe afterwards to get this info from executable)?

After compiling you can run "nm -S progname" to get the symbol addresses in the first column and (where available) the symbol size in the second column.

Jonas

Thanks, I'll try it!

Regards
Žilvinas