Re: Base64 Help

[Joseph Oreste Bruni]

"b64" is a filter BIO, it won't hold on to your data. You need to append a "memory BIO" to the back end of the filter bio so that your output can be accumulated.

On Oct 13, 2005, at 12:41 PM, Adam Jones wrote:

There are samples on how to do this in the OpenSSL book as well as a rather lengthy discussion on BIO's in general. Also "BIO_get_mem_ptr()" gives you a pointer to BUF_MEM structure, not a char*. Your compiler should have yelled at you for that.

Below is the code I am using to try and test the base64 encode in openssl. I am using rand to generate a binary and then encoding that to base64. Instead of using a file, I want to use memory to output the base64 encoded buffer. This code compiles and runs, but my output buffer is all 0. Any help would be appreciated. What have I missed?

The variable written does show 16 like it should......help!

#include <iostream>
#include <memory.h>
#include "evp.h"
#include "rand.h"
#include "bio.h"

using namespace std;

int main()
{
 BIO *b64;
 unsigned char *pbuffer = new unsigned char [16];
 unsigned char *pOutput = new unsigned char [100];
 int written;

 memset(pOutput, '0', 100);
 RAND_bytes(pbuffer, 16);
 b64 = BIO_new(BIO_f_base64());
 written = BIO_write(b64, pbuffer, 16);

 cout << written << endl;

 BIO_get_mem_ptr(b64, pOutput);

 for ( int nLoop = 0; nLoop< 16; nLoop++)
 {
 cout << pOutput[nLoop];
 }
 cout << "\n" << endl;

 BIO_free_all(b64);

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