demos/smime/smsign2.c

   1 /* S/MIME signing example: 2 signers. OpenSSL 0.9.9 only */
   2 #include <openssl/pem.h>
   3 #include <openssl/pkcs7.h>
   4 #include <openssl/err.h>
   5
   6 int main(int argc, char **argv)
   7         {
   8         BIO *in = NULL, *out = NULL, *tbio = NULL;
   9         X509 *scert = NULL, *scert2 = NULL;
  10         EVP_PKEY *skey = NULL, *skey2 = NULL;
  11         PKCS7 *p7 = NULL;
  12         int ret = 1;
  13
  14         OpenSSL_add_all_algorithms();
  15         ERR_load_crypto_strings();
  16
  17         tbio = BIO_new_file("signer.pem", "r");
  18
  19         if (!tbio)
  20                 goto err;
  21
  22         scert = PEM_read_bio_X509(tbio, NULL, 0, NULL);
  23
  24         BIO_reset(tbio);
  25
  26         skey = PEM_read_bio_PrivateKey(tbio, NULL, 0, NULL);
  27
  28         BIO_free(tbio);
  29
  30         tbio = BIO_new_file("signer2.pem", "r");
  31
  32         if (!tbio)
  33                 goto err;
  34
  35         scert2 = PEM_read_bio_X509(tbio, NULL, 0, NULL);
  36
  37         BIO_reset(tbio);
  38
  39         skey2 = PEM_read_bio_PrivateKey(tbio, NULL, 0, NULL);
  40
  41         if (!scert2 || !skey2)
  42                 goto err;
  43
  44         in = BIO_new_file("sign.txt", "r");
  45
  46         if (!in)
  47                 goto err;
  48
  49         p7 = PKCS7_sign(NULL, NULL, NULL, in, PKCS7_STREAM|PKCS7_PARTIAL);
  50
  51         if (!p7)
  52                 goto err;
  53
  54         /* Add each signer in turn */
  55
  56         if (!PKCS7_sign_add_signer(p7, scert, skey, NULL, 0))
  57                 goto err;
  58
  59         if (!PKCS7_sign_add_signer(p7, scert2, skey2, NULL, 0))
  60                 goto err;
  61
  62         out = BIO_new_file("smout.txt", "w");
  63         if (!out)
  64                 goto err;
  65
  66         /* NB: content included and finalized by SMIME_write_PKCS7 */
  67
  68         if (!SMIME_write_PKCS7(out, p7, in, PKCS7_STREAM))
  69                 goto err;
  70
  71         ret = 0;
  72
  73         err:
  74
  75         if (ret)
  76                 {
  77                 fprintf(stderr, "Error Signing Data\n");
  78                 ERR_print_errors_fp(stderr);
  79                 }
  80
  81         if (p7)
  82                 PKCS7_free(p7);
  83
  84         if (scert)
  85                 X509_free(scert);
  86         if (skey)
  87                 EVP_PKEY_free(skey);
  88
  89         if (scert2)
  90                 X509_free(scert2);
  91         if (skey)
  92                 EVP_PKEY_free(skey2);
  93
  94         if (in)
  95                 BIO_free(in);
  96         if (out)
  97                 BIO_free(out);
  98         if (tbio)
  99                 BIO_free(tbio);
 100
 101         return ret;
 102
 103         }
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