Untitled

#include <stdio.h>#include <string.h>#include <openssl/evp.h>unsigned char *base64_encode (unsigned char *buffer, unsigned int len){  unsigned char *ret = (unsigned char *) malloc ((((len+2)/3)*4)+1);  EVP_EncodeBlock (ret, buffer, len);  ret[(((len+2)/3)*4)] = 0;  return ret;}unsigned char *base64_decode (unsigned char *buffer, unsigned int len){  unsigned char *ret = (unsigned char *) malloc ((((len+2)/3)*4)+1);  EVP_DecodeBlock (ret, buffer, len);  ret[(((len+2)/3)*4)] = 0;  return ret;}void usage (char *progname) {   printf ("Usage: %s [ encode | decode ] Text\n\n", progname);   exit(0);}int main (int argc, char *argv[]){   int i;   /* Sin parametros */   if (argc < 3) usage(argv[0]);   if (argc == 3) {      /* Verificamos los algoritmos */      if (strcmp(argv[1], "encode")  == 0)         printf ("%s\n", base64_encode (argv[2], strlen(argv[2])));      if (strcmp(argv[1], "decode") == 0)         printf ("%s\n", base64_decode (argv[2], strlen(argv[2])));   }   else  usage(argv[0]);   return 0;}