crypto/external/bsd/openssl/dist/demos/cms/cms_denc.c

   1 /*
   2  * S/MIME detached data encrypt example: rarely done but should the need
   3  * arise this is an example....
   4  */
   5 #include <openssl/pem.h>
   6 #include <openssl/cms.h>
   7 #include <openssl/err.h>
   8
   9 int main(int argc, char **argv)
  10 {
  11     BIO *in = NULL, *out = NULL, *tbio = NULL, *dout = NULL;
  12     X509 *rcert = NULL;
  13     STACK_OF(X509) *recips = NULL;
  14     CMS_ContentInfo *cms = NULL;
  15     int ret = 1;
  16
  17     int flags = CMS_STREAM | CMS_DETACHED;
  18
  19     OpenSSL_add_all_algorithms();
  20     ERR_load_crypto_strings();
  21
  22     /* Read in recipient certificate */
  23     tbio = BIO_new_file("signer.pem", "r");
  24
  25     if (!tbio)
  26         goto err;
  27
  28     rcert = PEM_read_bio_X509(tbio, NULL, 0, NULL);
  29
  30     if (!rcert)
  31         goto err;
  32
  33     /* Create recipient STACK and add recipient cert to it */
  34     recips = sk_X509_new_null();
  35
  36     if (!recips || !sk_X509_push(recips, rcert))
  37         goto err;
  38
  39     /*
  40      * sk_X509_pop_free will free up recipient STACK and its contents so set
  41      * rcert to NULL so it isn't freed up twice.
  42      */
  43     rcert = NULL;
  44
  45     /* Open content being encrypted */
  46
  47     in = BIO_new_file("encr.txt", "r");
  48
  49     dout = BIO_new_file("smencr.out", "wb");
  50
  51     if (!in)
  52         goto err;
  53
  54     /* encrypt content */
  55     cms = CMS_encrypt(recips, in, EVP_des_ede3_cbc(), flags);
  56
  57     if (!cms)
  58         goto err;
  59
  60     out = BIO_new_file("smencr.pem", "w");
  61     if (!out)
  62         goto err;
  63
  64     if (!CMS_final(cms, in, dout, flags))
  65         goto err;
  66
  67     /* Write out CMS structure without content */
  68     if (!PEM_write_bio_CMS(out, cms))
  69         goto err;
  70
  71     ret = 0;
  72
  73  err:
  74
  75     if (ret) {
  76         fprintf(stderr, "Error Encrypting Data\n");
  77         ERR_print_errors_fp(stderr);
  78     }
  79
  80     if (cms)
  81         CMS_ContentInfo_free(cms);
  82     if (rcert)
  83         X509_free(rcert);
  84     if (recips)
  85         sk_X509_pop_free(recips, X509_free);
  86
  87     if (in)
  88         BIO_free(in);
  89     if (out)
  90         BIO_free(out);
  91     if (dout)
  92         BIO_free(dout);
  93     if (tbio)
  94         BIO_free(tbio);
  95
  96     return ret;
  97
  98 }