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, NULL, out, 0))
51        goto err;
52
53    ret = 0;
54
55 err:
56
57    if (ret) {
58        fprintf(stderr, "Error Decrypting Data\n");
59        ERR_print_errors_fp(stderr);
60    }
61
62    if (cms)
63        CMS_ContentInfo_free(cms);
64    if (rcert)
65        X509_free(rcert);
66    if (rkey)
67        EVP_PKEY_free(rkey);
68
69    if (in)
70        BIO_free(in);
71    if (out)
72        BIO_free(out);
73    if (tbio)
74        BIO_free(tbio);
75
76    return ret;
77
78}
79