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https://journal.missiondata.com/how-to-base64-encode-with-c-c-and-openssl-acccb1045c42
How To Base64 Encode with C/C++ and OpenSSL
Originally posted April 11, 2006
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 OpenSLL.
#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
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One Response to “Howto base64 encode with C/C++ and OpenSSL”
- November 30th, 2006 @ 10:24 pm bsm responded:
I found this works better, as some chars were being chopped off during subsequent decoding:
char *buff = (char *)malloc(bptr->length+1);
memcpy(buff, bptr->data, bptr->length);
buff[bptr->length] = 0;
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