1 /* Simple S/MIME signing example */
2 #include <openssl/pem.h>
3 #include <openssl/pkcs7.h>
4 #include <openssl/err.h>
6 int main(int argc, char **argv)
8 BIO *in = NULL, *out = NULL, *tbio = NULL;
10 EVP_PKEY *skey = NULL;
14 /* For simple S/MIME signing use PKCS7_DETACHED.
15 * On OpenSSL 0.9.9 only:
16 * for streaming detached set PKCS7_DETACHED|PKCS7_STREAM
17 * for streaming non-detached set PKCS7_STREAM
19 int flags = PKCS7_DETACHED|PKCS7_STREAM;
21 OpenSSL_add_all_algorithms();
22 ERR_load_crypto_strings();
24 /* Read in signer certificate and private key */
25 tbio = BIO_new_file("signer.pem", "r");
30 scert = PEM_read_bio_X509(tbio, NULL, 0, NULL);
34 skey = PEM_read_bio_PrivateKey(tbio, NULL, 0, NULL);
39 /* Open content being signed */
41 in = BIO_new_file("sign.txt", "r");
47 p7 = PKCS7_sign(scert, skey, NULL, in, flags);
52 out = BIO_new_file("smout.txt", "w");
56 if (!(flags & PKCS7_STREAM))
59 /* Write out S/MIME message */
60 if (!SMIME_write_PKCS7(out, p7, in, flags))
69 fprintf(stderr, "Error Signing Data\n");
70 ERR_print_errors_fp(stderr);