i try to compile this #include <iostream> #include "md5.h" using namespace std; //prototype function declaration void input(); int GetSeed(); typedef unsigned int u8,u32; // char password[128]; //input() will pass the characters typed to the variable "password" void input() { cout<<"Input Password: "; cin>>password; cin.get(); } int main() { input(); } void hashtest() { u8 hash[16] = {0}; // HashPassword(password, hash, sizeof(hash)); //for now just set some arbitrary values in 'hash' char szSeed[(sizeof(u32) * 3) + 1] = {0}; itoa(AuthNet::GetSeed(), szSeed, 10); //GetSeed() is just a func that returns int, set it to whatever you like MD5 md5; u8 digest[MD5::DIGESTSIZE]; md5.Update(hash, sizeof(hash)); md5.Update((u8 *)szSeed, strlen(szSeed)); md5.Final(digest);// this is garble-2 } and i get these errors...wtf ../hashtest.cpp: In function `void hashtest()': ../hashtest.cpp:32: error: `AuthNet' has not been declared ../hashtest.cpp:33: error: `MD5' undeclared (first use this function) ../hashtest.cpp:33: error: (Each undeclared identifier is reported only once for each function it appears in.) ../hashtest.cpp:33: error: expected `;' before "md5" ../hashtest.cpp:34: error: `MD5' has not been declared ../hashtest.cpp:34: error: `DIGESTSIZE' undeclared (first use this function) ../hashtest.cpp:35: error: `md5' undeclared (first use this function) ../hashtest.cpp:37: error: `digest' undeclared (first use this function) make.exe: *** ["../hashtest.o"] Error 1 Execution terminated

please...someone

It doesnt know what AuthNet is

i dont see that as a class in the library..hmm what can i do?

Find another lib to use or write your own even.

Maybe they're in a namespace?

I assume md5.h is as specified in the rfc http://www.ietf.org/rfc/rfc1321.txt

At the bottom of all that code is a sample app that uses the algorithm called mddriver.c

You need to include md5.c as well as md5.h

If you would rather use MSCrypto API that is a different story.