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rwdalpe

Member

Registered: 2011-06-09

Posts: 3

[SOLVED] g++ errors saying byte array is unsigned char array

Does anyone know why this code

#include <iostream>
#include <string>
#include <iomanip>
#include "cryptopp/osrng.h"

using namespace std;

int main() {
        const unsigned int BLOCKSIZE = 16*8;
        byte * pcbScratch = (byte *)calloc(BLOCKSIZE, sizeof(byte)); // Same error happens with byte pcbScratch[BLOCKSIZE]

        CryptoPP::AutoSeededRandomPool rng;

        rng.GenerateBlock(pcbScratch, BLOCKSIZE);

        for(unsigned int i = 0; i < BLOCKSIZE; i++) {
                cout << *(pcbScratch+i);
        }
        return 0;
}

would cause this error?

g++ TestClass.cpp 
/tmp/cc7wp4jU.o: In function `main':
TestClass.cpp:(.text+0x202): undefined reference to `CryptoPP::RandomNumberGenerator::GenerateBlock(unsigned char*, unsigned int)'

Last edited by rwdalpe (2011-06-15 03:22:30)

ewaller

Administrator

From: Pasadena, CA

Registered: 2009-07-13

Posts: 20,324

Re: [SOLVED] g++ errors saying byte array is unsigned char array

That would be a linker error.  How are you making this and do you want to share your class declaration with us?

BTW this is a bit odd for a first post.  Could you give us some background about you?

Last edited by ewaller (2011-06-15 03:02:32)

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rwdalpe

Member

Registered: 2011-06-09

Posts: 3

Re: [SOLVED] g++ errors saying byte array is unsigned char array

Sure thing!

I used to post on the forum under the username l33tunderground, but have since decided I would rather go with a less childish username.

To be honest, I just started a project in Eclipse and attempted to include the Crypto++ libraries, which I installed through pacman. I don't know if there's anything special I need to do to properly include the library, as the Crypto++ documentation is painfully lacking in basics.

Edit: Shameless plug to the Arch forums

I've found in the past that Arch users are incredibly reliable and helpful, so I posted here rather than a traditional programming forum.

Last edited by rwdalpe (2011-06-15 03:13:22)

rwdalpe

Member

Registered: 2011-06-09

Posts: 3

Re: [SOLVED] g++ errors saying byte array is unsigned char array

Bah! Shame on me for not finding this sooner.

My issue was solved with

g++ TestClass.cpp -lcryptopp -lpthread

ewaller

Administrator

From: Pasadena, CA

Registered: 2009-07-13

Posts: 20,324

Re: [SOLVED] g++ errors saying byte array is unsigned char array

class CRYPTOPP_DLL BlockingRng : public RandomNumberGenerator
{
public:
        BlockingRng();
        ~BlockingRng();
        void GenerateBlock(byte *output, size_t size);

protected:
        int m_fd;
};

and

CryptoPP::RandomNumberGenerator::GenerateBlock(unsigned char*, unsigned int)

That should be okay. 
But you do need to link to /usr/lib/libcryptopp.a or to /usr/lib/libcryptopp.so

Edit: Never Mind.  Glad you solved it.

Last edited by ewaller (2011-06-15 03:31:24)

---

Nothing is too wonderful to be true, if it be consistent with the laws of nature -- Michael Faraday
Sometimes it is the people no one can imagine anything of who do the things no one can imagine. -- Alan Turing
---
How to Ask Questions the Smart Way