demos/maurice/example2.c

   1 /* NOCW */
   2 /*
   3         Please read the README file for condition of use, before
   4         using this software.
   5
   6         Maurice Gittens  <mgittens@gits.nl>   January 1997
   7 */
   8
   9 #include <stdlib.h>
  10 #include <stdio.h>
  11 #include <strings.h>
  12
  13 #include <openssl/rsa.h>
  14 #include <openssl/evp.h>
  15 #include <openssl/objects.h>
  16 #include <openssl/x509.h>
  17 #include <openssl/err.h>
  18 #include <openssl/pem.h>
  19 #include <openssl/ssl.h>
  20
  21 #include "loadkeys.h"
  22
  23 #define PUBFILE   "cert.pem"
  24 #define PRIVFILE  "privkey.pem"
  25 #define STDIN     0
  26 #define STDOUT    1
  27
  28 int main()
  29 {
  30         char *ct = "This the clear text";
  31         char *buf;
  32         char *buf2;
  33         EVP_PKEY *pubKey;
  34         EVP_PKEY *privKey;
  35         int len;
  36
  37         ERR_load_crypto_strings();
  38
  39         privKey = ReadPrivateKey(PRIVFILE);
  40         if (!privKey)
  41         {
  42                 ERR_print_errors_fp (stderr);
  43                 exit (1);
  44         }
  45
  46         pubKey = ReadPublicKey(PUBFILE);
  47         if(!pubKey)
  48         {
  49            EVP_PKEY_free(privKey);
  50            fprintf(stderr,"Error: can't load public key");
  51            exit(1);
  52         }
  53
  54         /* No error checking */
  55         buf = malloc(EVP_PKEY_size(pubKey));
  56         buf2 = malloc(EVP_PKEY_size(pubKey));
  57
  58         len = RSA_public_encrypt(strlen(ct)+1, ct, buf, pubKey->pkey.rsa,RSA_PKCS1_PADDING);
  59
  60         if (len != EVP_PKEY_size(pubKey))
  61         {
  62             fprintf(stderr,"Error: ciphertext should match length of key\n");
  63             exit(1);
  64         }
  65
  66         RSA_private_decrypt(len, buf, buf2, privKey->pkey.rsa,RSA_PKCS1_PADDING);
  67
  68         printf("%s\n", buf2);
  69
  70         EVP_PKEY_free(privKey);
  71         EVP_PKEY_free(pubKey);
  72         free(buf);
  73         free(buf2);
  74         return 0;
  75 }