Howto base64 encode with C/C++ and OpenSSL
By
carson
|
Published:
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 OpenSSL.
#include
#include
char *base64(const unsigned char *input, int length);
int main(int argc, char **argv) { char *output = base64("YOYO!", sizeof("YOYO!")); printf("Base64: *%s*", 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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