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
;
15 * For simple S/MIME signing use PKCS7_DETACHED. On OpenSSL 0.9.9 only:
16 * for streaming detached set PKCS7_DETACHED|PKCS7_STREAM for streaming
17 * 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
))
68 fprintf(stderr
, "Error Signing Data\n");
69 ERR_print_errors_fp(stderr
);