Base64 Decode Problem

[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 get this result using 
OpenSSL 0.9.8k (cross-compiled for a Blackfin processor) and OpenSSL 0.9.8g 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);

    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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