IONCANNON » base64 http://www.ioncannon.net Thoughts on Software Development and Engineering Tue, 03 Jan 2012 13:59:08 +0000 en hourly 1 Howto base64 decode with C/C++ and OpenSSL http://www.ioncannon.net/programming/122/howto-base64-decode-with-cc-and-openssl/ http://www.ioncannon.net/programming/122/howto-base64-decode-with-cc-and-openssl/#comments Wed, 28 Feb 2007 13:27:47 +0000 carson http://www.ioncannon.net/cc/122/howto-base64-decode-with-cc-and-openssl/ Someone asked for an example of decoding with OpenSSL on the Howto base64 encode with C/C++ and OpenSSL post. So here it is:

#include <string.h>

#include <openssl/sha.h>
#include <openssl/hmac.h>
#include <openssl/evp.h>
#include <openssl/bio.h>
#include <openssl/buffer.h>

char *unbase64(unsigned char *input, int length);

int main(int argc, char **argv)
{
  char *output = unbase64("WU9ZTyEA\n\0", strlen("WU9ZTyEA\n\0"));
  printf("Unbase64: *%s*\n", output);
  free(output);
}

char *unbase64(unsigned char *input, int length)
{
  BIO *b64, *bmem;

  char *buffer = (char *)malloc(length);
  memset(buffer, 0, length);

  b64 = BIO_new(BIO_f_base64());
  bmem = BIO_new_mem_buf(input, length);
  bmem = BIO_push(b64, bmem);

  BIO_read(bmem, buffer, length);

  BIO_free_all(bmem);

  return buffer;
}

Tags: , ,

]]> http://www.ioncannon.net/programming/122/howto-base64-decode-with-cc-and-openssl/feed/ 8 Howto base64 encode with C/C++ and OpenSSL http://www.ioncannon.net/programming/34/howto-base64-encode-with-cc-and-openssl/ http://www.ioncannon.net/programming/34/howto-base64-encode-with-cc-and-openssl/#comments Tue, 11 Apr 2006 21:26:32 +0000 carson http://www.ioncannon.net/uncategorized/34/howto-base64-encode-with-cc-and-openssl/ I've been doing a little C programming lately and I have found that if you have a up to date distribution of linux there are a lot of libraries out there that make doing things you do in other languages like java easier.

As I have time I'm going to post some examples of what I have found. The first here is how to base64 encode a chunk of memory using OpenSSL.

#include <string.h>

#include <openssl/sha.h>
#include <openssl/hmac.h>
#include <openssl/evp.h>
#include <openssl/bio.h>
#include <openssl/buffer.h>

char *base64(const unsigned char *input, int length);

int main(int argc, char **argv)
{
  char *output = base64("YOYO!", sizeof("YOYO!"));
  printf("Base64: *%s*\n", output);
  free(output);
}

char *base64(const unsigned char *input, int length)
{
  BIO *bmem, *b64;
  BUF_MEM *bptr;

  b64 = BIO_new(BIO_f_base64());
  bmem = BIO_new(BIO_s_mem());
  b64 = BIO_push(b64, bmem);
  BIO_write(b64, input, length);
  BIO_flush(b64);
  BIO_get_mem_ptr(b64, &bptr);

  char *buff = (char *)malloc(bptr->length);
  memcpy(buff, bptr->data, bptr->length-1);
  buff[bptr->length-1] = 0;

  BIO_free_all(b64);

  return buff;
}

And to compile this just use the following command:

cc -o base64 base64.c -lssl
]]> http://www.ioncannon.net/programming/34/howto-base64-encode-with-cc-and-openssl/feed/ 11