VS2010中的多线程DLL中的Cryptopp

Question

I'm trying to use Cryptopp 5.6.2 on XPSP3 using VS 2010. New to this...

I need to use the mult-threading DLLs as that is what my application uses, so I changed all references in the Crypto++ project properties from /MT[d] to /MD[d] . All Crypto++ seems to build OK.

However, all is not happy with my C++ console app - I have the standard GetNewAndDeleteForCryptoPP and that seems to be called OK (remove it and cryptopp gives an error, include it and cryptopp doesn't print warnings).

All seems fine until I add in the line PKCS5_PBKDF2_HMAC<SHA256> . It compiles fine but causes two LNK2001 errors for unresolved symbols for CryptoPP::ThreadUserTimer::GetCurrentTimerValue(void) and CryptoPP::ThreadUserTimer::TicksPerSecond(void) .

Running out of ideas here - I can't paste the code due to arcane rules at the place I work, however I have included dll.h , cryptlib.h , osrng.h , aes.h , sha.h , hex.h , integer.h , modes.h and pwdbased.h .

Am I missing something blindingly obvious?

Answer 1

I was having this issue too, it doesn't look like that class is being exported. Adding CRYPTOPP_DLL to the declaration of ThreadUserTimer in hrtimer.h will fix it.

Answer 2

user1520427 provided you the answer. You need to add CRYPTOPP_DLL for a few classes and functions.

PKCS5_PBKDF2_HMAC<SHA256> is a header only implementation, so it does not need CRYPTOPP_DLL . See pwdbased.h .

However, ThreadUserTimer is not header only, so you need to modify hrtimer.h :

OLD:

00042 class ThreadUserTimer : public TimerBase
00043 {
00044    ...
00048 };

NEW:

00042 class CRYPTOPP_DLL ThreadUserTimer : public TimerBase
00043 {
00044     ...
00048 };