base64_encode.c

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

std::string base64_encode (const void* data, int len)
{
  std::string ret;
  BIO *       bio, *b64;
  BUF_MEM*    bufferPtr;

  b64 = BIO_new (BIO_f_base64 ());
  bio = BIO_new (BIO_s_mem ());
  bio = BIO_push (b64, bio);

  BIO_set_flags (bio, BIO_FLAGS_BASE64_NO_NL); //Ignore newlines - write everything in one line
  BIO_write (bio, data, len);
  BIO_flush (bio);
  BIO_get_mem_ptr (bio, &bufferPtr);
  ret = std::string (bufferPtr->data, bufferPtr->length);
  BIO_set_close (bio, BIO_NOCLOSE);
  BIO_free_all (bio);
  return ret;
}