Re: Base64 Help

[Joseph Oreste Bruni]

Using VC++ is your first problem... :)




Do this:

int main()
{
    BIO *bmem, *b64;
    char message[] = "Hello World \n";
    int written = 0;

    b64 = BIO_new(BIO_f_base64());
    bmem = BIO_new_fp(stdout,0);
    b64 = BIO_push(b64, bmem);
    written = BIO_write(b64, message, strlen(message));
    cout << written << endl;
    BIO_flush(b64);
    BIO_free_all(b64);
}






On Oct 13, 2005, at 1:55 PM, Adam Jones wrote:

The call to BIO_push is your problem. You overwrite your reference to the b64 BIO with another reference to the mem BIO. So now, b64 points to mem. This will output your Base64 to stdout. Then if you need to use a mem BIO just change out the call to what you had, but you'll need to get pointers to the data to display it (or whatever).

Visual C++ did not complain nor did it error out when it ran, but you are correct it does take a BUF_MEM structure. I also added another BIO method to the code. I also read that section in the book you suggested. I also made the code simple, but it appears that it still does not give me the base64

encoding. Any suggestions...

int main()
{
    BIO *bmem, *b64;
    char message[] = "Hello World \n";
    int written = 0;

    b64 = BIO_new(BIO_f_base64());
    bmem = BIO_new(BIO_s_mem());
    bmem = BIO_push(b64, bmem);
    written = BIO_write(b64, message, strlen(message));
    cout << written << endl;
    BIO_flush(b64);
    BIO_free_all(b64);
}



-----Original Message-----
From: [EMAIL PROTECTED]

[mailto:[EMAIL PROTECTED] On Behalf Of Joseph Oreste Bruni

Sent: Thursday, October 13, 2005 2:46 PM
To: openssl-users@openssl.org
Subject: Re: Base64 Help


accumulated.


lengthy discussion on BIO's in general.


char*. Your compiler should have yelled at you for that.


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

"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 There are samples on how to do this in the OpenSSL book as well as a rather Also "BIO_get_mem_ptr()" gives you a pointer to BUF_MEM structure, not a

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

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);

to base64. Instead of using a file, I want to use memory to output the

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