demos/cms/cms_sign2.c

   1 /* S/MIME signing example: 2 signers */
   2 #include <openssl/pem.h>
   3 #include <openssl/cms.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     CMS_ContentInfo *cms = 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     cms = CMS_sign(NULL, NULL, NULL, in, CMS_STREAM | CMS_PARTIAL);
  50
  51     if (!cms)
  52         goto err;
  53
  54     /* Add each signer in turn */
  55
  56     if (!CMS_add1_signer(cms, scert, skey, NULL, 0))
  57         goto err;
  58
  59     if (!CMS_add1_signer(cms, 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_CMS */
  67
  68     if (!SMIME_write_CMS(out, cms, in, CMS_STREAM))
  69         goto err;
  70
  71     ret = 0;
  72
  73  err:
  74
  75     if (ret) {
  76         fprintf(stderr, "Error Signing Data\n");
  77         ERR_print_errors_fp(stderr);
  78     }
  79
  80     if (cms)
  81         CMS_ContentInfo_free(cms);
  82
  83     X509_free(scert);
  84     EVP_PKEY_free(skey);
  85     X509_free(scert2);
  86     EVP_PKEY_free(skey2);
  87     BIO_free(in);
  88     BIO_free(out);
  89     BIO_free(tbio);
  90
  91     return ret;
  92
  93 }