2 * S/MIME detached data encrypt example: rarely done but should the need
3 * arise this is an example....
5 #include <openssl/pem.h>
6 #include <openssl/cms.h>
7 #include <openssl/err.h>
9 int main(int argc, char **argv)
11 BIO *in = NULL, *out = NULL, *tbio = NULL, *dout = NULL;
13 STACK_OF(X509) *recips = NULL;
14 CMS_ContentInfo *cms = NULL;
17 int flags = CMS_STREAM | CMS_DETACHED;
19 OpenSSL_add_all_algorithms();
20 ERR_load_crypto_strings();
22 /* Read in recipient certificate */
23 tbio = BIO_new_file("signer.pem", "r");
28 rcert = PEM_read_bio_X509(tbio, NULL, 0, NULL);
33 /* Create recipient STACK and add recipient cert to it */
34 recips = sk_X509_new_null();
36 if (!recips || !sk_X509_push(recips, rcert))
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.
45 /* Open content being encrypted */
47 in = BIO_new_file("encr.txt", "r");
49 dout = BIO_new_file("smencr.out", "wb");
55 cms = CMS_encrypt(recips, in, EVP_des_ede3_cbc(), flags);
60 out = BIO_new_file("smencr.pem", "w");
64 if (!CMS_final(cms, in, dout, flags))
67 /* Write out CMS structure without content */
68 if (!PEM_write_bio_CMS(out, cms))
76 fprintf(stderr, "Error Encrypting Data\n");
77 ERR_print_errors_fp(stderr);
81 CMS_ContentInfo_free(cms);
85 sk_X509_pop_free(recips, X509_free);