1/* Simple S/MIME decryption example */
2#include <openssl/pem.h>
3#include <openssl/cms.h>
4#include <openssl/err.h>
5
6int main(int argc, char **argv)
7	{
8	BIO *in = NULL, *out = NULL, *tbio = NULL;
9	X509 *rcert = NULL;
10	EVP_PKEY *rkey = NULL;
11	CMS_ContentInfo *cms = NULL;
12	int ret = 1;
13
14	OpenSSL_add_all_algorithms();
15	ERR_load_crypto_strings();
16
17	/* Read in recipient certificate and private key */
18	tbio = BIO_new_file("signer.pem", "r");
19
20	if (!tbio)
21		goto err;
22
23	rcert = PEM_read_bio_X509(tbio, NULL, 0, NULL);
24
25	BIO_reset(tbio);
26
27	rkey = PEM_read_bio_PrivateKey(tbio, NULL, 0, NULL);
28
29	if (!rcert || !rkey)
30		goto err;
31
32	/* Open S/MIME message to decrypt */
33
34	in = BIO_new_file("smencr.txt", "r");
35
36	if (!in)
37		goto err;
38
39	/* Parse message */
40	cms = SMIME_read_CMS(in, NULL);
41
42	if (!cms)
43		goto err;
44
45	out = BIO_new_file("decout.txt", "w");
46	if (!out)
47		goto err;
48
49	/* Decrypt S/MIME message */
50	if (!CMS_decrypt(cms, rkey, rcert, out, NULL, 0))
51		goto err;
52
53	ret = 0;
54
55	err:
56
57	if (ret)
58		{
59		fprintf(stderr, "Error Decrypting Data\n");
60		ERR_print_errors_fp(stderr);
61		}
62
63	if (cms)
64		CMS_ContentInfo_free(cms);
65	if (rcert)
66		X509_free(rcert);
67	if (rkey)
68		EVP_PKEY_free(rkey);
69
70	if (in)
71		BIO_free(in);
72	if (out)
73		BIO_free(out);
74	if (tbio)
75		BIO_free(tbio);
76
77	return ret;
78
79	}
80