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/* S/MIME signing example: 2 signers. OpenSSL 0.9.9 only */
#include <openssl/pem.h>
#include <openssl/pkcs7.h>
#include <openssl/err.h>
int main(int argc, char **argv)
{
BIO *in = NULL, *out = NULL, *tbio = NULL;
X509 *scert = NULL, *scert2 = NULL;
EVP_PKEY *skey = NULL, *skey2 = NULL;
PKCS7 *p7 = NULL;
int ret = 1;
OpenSSL_add_all_algorithms();
ERR_load_crypto_strings();
tbio = BIO_new_file("signer.pem", "r");
if (!tbio)
goto err;
scert = PEM_read_bio_X509(tbio, NULL, 0, NULL);
BIO_reset(tbio);
skey = PEM_read_bio_PrivateKey(tbio, NULL, 0, NULL);
BIO_free(tbio);
tbio = BIO_new_file("signer2.pem", "r");
if (!tbio)
goto err;
scert2 = PEM_read_bio_X509(tbio, NULL, 0, NULL);
BIO_reset(tbio);
skey2 = PEM_read_bio_PrivateKey(tbio, NULL, 0, NULL);
if (!scert2 || !skey2)
goto err;
in = BIO_new_file("sign.txt", "r");
if (!in)
goto err;
p7 = PKCS7_sign(NULL, NULL, NULL, in, PKCS7_STREAM|PKCS7_PARTIAL);
if (!p7)
goto err;
/* Add each signer in turn */
if (!PKCS7_sign_add_signer(p7, scert, skey, NULL, 0))
goto err;
if (!PKCS7_sign_add_signer(p7, scert2, skey2, NULL, 0))
goto err;
out = BIO_new_file("smout.txt", "w");
if (!out)
goto err;
/* NB: content included and finalized by SMIME_write_PKCS7 */
if (!SMIME_write_PKCS7(out, p7, in, PKCS7_STREAM))
goto err;
ret = 0;
err:
if (ret)
{
fprintf(stderr, "Error Signing Data\n");
ERR_print_errors_fp(stderr);
}
if (p7)
PKCS7_free(p7);
if (scert)
X509_free(scert);
if (skey)
EVP_PKEY_free(skey);
if (scert2)
X509_free(scert2);
if (skey)
EVP_PKEY_free(skey2);
if (in)
BIO_free(in);
if (out)
BIO_free(out);
if (tbio)
BIO_free(tbio);
return ret;
}