Logo Search packages:      
Sourcecode: openssl version File versions

example3.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 
#define INIT_VECTOR     "12345678"
#define ENCRYPT         1
#define DECRYPT         0
#define ALG       EVP_des_ede3_cbc()

static const char *usage = "Usage: example3 [-d] password\n";

void do_cipher(char *,int);

int main(int argc, char *argv[])
{
      if ((argc == 2))  
      {
            do_cipher(argv[1],ENCRYPT);
      }     
      else if ((argc == 3) && !strcmp(argv[1],"-d"))
      {
            do_cipher(argv[2],DECRYPT);
      }
      else
      {
            fprintf(stderr,"%s", usage);
            exit(1);
      }

      return 0;         
}

void do_cipher(char *pw, int operation)
{
      char buf[BUFLEN];
      char ebuf[BUFLEN + 8];
      unsigned int ebuflen; /* rc; */
        unsigned char iv[EVP_MAX_IV_LENGTH], key[EVP_MAX_KEY_LENGTH];
      /* unsigned int ekeylen, net_ekeylen;  */
      EVP_CIPHER_CTX ectx;
        
      memcpy(iv, INIT_VECTOR, sizeof(iv));

      EVP_BytesToKey(ALG, EVP_md5(), "salu", pw, strlen(pw), 1, key, iv);

      EVP_CIPHER_CTX_init(&ectx);
      EVP_CipherInit_ex(&ectx, ALG, NULL, key, iv, operation);

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

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

            write(STDOUT, ebuf, ebuflen);
      }

        EVP_CipherFinal_ex(&ectx, ebuf, &ebuflen); 
      EVP_CIPHER_CTX_cleanup(&ectx);

      write(STDOUT, ebuf, ebuflen); 
}

Generated by  Doxygen 1.6.0   Back to index