Logo Search packages:      
Sourcecode: openssl version File versions

example4.c

/* NOCW */
/*
        Please read the README file for condition of use, before
        using this software.

        Maurice Gittens  <mgittens@gits.nl>   January 1997

*/

#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <openssl/evp.h>

#define STDIN           0
#define STDOUT          1
#define BUFLEN          512 

static const char *usage = "Usage: example4 [-d]\n";

void do_encode(void);
void do_decode(void);

int main(int argc, char *argv[])
{
      if ((argc == 1))  
      {
            do_encode();
      }     
      else if ((argc == 2) && !strcmp(argv[1],"-d"))
      {
            do_decode();
      }
      else
      {
            fprintf(stderr,"%s", usage);
            exit(1);
      }

      return 0;         
}

void do_encode()
{
      char buf[BUFLEN];
      char ebuf[BUFLEN+24];
      unsigned int ebuflen;
      EVP_ENCODE_CTX ectx;
        
      EVP_EncodeInit(&ectx);

      while(1)
      {
            int readlen = read(STDIN, buf, sizeof(buf));
      
            if (readlen <= 0)
            {
                  if (!readlen)
                     break;
                  else
                  {
                        perror("read");
                        exit(1);
                  }
            }

            EVP_EncodeUpdate(&ectx, ebuf, &ebuflen, buf, readlen);

            write(STDOUT, ebuf, ebuflen);
      }

        EVP_EncodeFinal(&ectx, ebuf, &ebuflen); 

      write(STDOUT, ebuf, ebuflen);
}

void do_decode()
{
      char buf[BUFLEN];
      char ebuf[BUFLEN+24];
      unsigned int ebuflen;
      EVP_ENCODE_CTX ectx;
        
      EVP_DecodeInit(&ectx);

      while(1)
      {
            int readlen = read(STDIN, buf, sizeof(buf));
            int rc;     
      
            if (readlen <= 0)
            {
                  if (!readlen)
                     break;
                  else
                  {
                        perror("read");
                        exit(1);
                  }
            }

            rc = EVP_DecodeUpdate(&ectx, ebuf, &ebuflen, buf, readlen);
            if (rc <= 0)
            {
                  if (!rc)
                  {
                        write(STDOUT, ebuf, ebuflen);
                        break;
                  }

                  fprintf(stderr, "Error: decoding message\n");
                  return;
            }

            write(STDOUT, ebuf, ebuflen);
      }

        EVP_DecodeFinal(&ectx, ebuf, &ebuflen); 

      write(STDOUT, ebuf, ebuflen); 
}


Generated by  Doxygen 1.6.0   Back to index