Base64 Decode Problem/Question

[Doug Kehn]

Hi All,

I'm trying to decode a base64 encoded string.  The problem I'm running in to is 
that BIO_read() always returns 0.  BIO_should_retry() and BIO_should_read() 
also return 0 when BIO_read() returns 0.  If the base64 encoded string is 
shortened, BIO_read returns the decoded information.  I'm using OpenSSL 0.9.8g 
19 Oct 2007 on Ubuntu 9.04.

Any suggestions on what I'm doing wrong?

Thanks,
...doug

---8<-----

/*
 * Compiled with: gcc -Wall -lssl
 */

#include <openssl/bio.h>
#include <openssl/evp.h>
#include <stdio.h>
#include <string.h>

int main(int argc, char **argv)
{
#if 1
        /*
         * This does not work
         */
        char *message = 
"Tm8gaXMgdGhlIHRpbWUgZm9yIGFsbCBnb29kIG1lbiB0byBjb21lIHRvIHRoZSBhaWQgb2YgdGhlaXIgY291bnRyeS4NClRoZSBxdWljayBicm93biBmb3gganVtcGVkIG92ZXIgdGhlIGxhenkgZG9nJ3MgYmFjayAwMTIzNDU2Nzg5Lg==\n";
#endif
#if 0
        /*
         * This shortened version works
         */
        char *message = "Tm8gaXMgdGhlIHRpbWUgZm9yIGFsbCBnb29kIG1lbiB0by==\n";
#endif

        BIO *b64, *bio, *bmem;
        char *buf;
        int i = strlen(message) + 25;

        buf = malloc(i);
        if (!buf) {
                printf("malloc fail, %m\n");
                return -1;
        }

        bmem = BIO_new_mem_buf((void*)message, -1);
        b64 = BIO_new(BIO_f_base64());
        BIO_set_flags(bmem, BIO_FLAGS_BASE64_NO_NL);
        bio = BIO_push(b64, bmem);
        i = BIO_read(bio, (void*)buf, i);
        buf[i] = '\0';
        BIO_free_all(bio);

        printf("%s\n%s\n", message, buf);

        return 0;
}


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