1*e0c4386eSCy Schubert /*
2*e0c4386eSCy Schubert * Copyright 2008-2016 The OpenSSL Project Authors. All Rights Reserved.
3*e0c4386eSCy Schubert *
4*e0c4386eSCy Schubert * Licensed under the Apache License 2.0 (the "License"). You may not use
5*e0c4386eSCy Schubert * this file except in compliance with the License. You can obtain a copy
6*e0c4386eSCy Schubert * in the file LICENSE in the source distribution or at
7*e0c4386eSCy Schubert * https://www.openssl.org/source/license.html
8*e0c4386eSCy Schubert */
9*e0c4386eSCy Schubert
10*e0c4386eSCy Schubert /*
11*e0c4386eSCy Schubert * S/MIME detached data decrypt example: rarely done but should the need
12*e0c4386eSCy Schubert * arise this is an example....
13*e0c4386eSCy Schubert */
14*e0c4386eSCy Schubert #include <openssl/pem.h>
15*e0c4386eSCy Schubert #include <openssl/cms.h>
16*e0c4386eSCy Schubert #include <openssl/err.h>
17*e0c4386eSCy Schubert
main(int argc,char ** argv)18*e0c4386eSCy Schubert int main(int argc, char **argv)
19*e0c4386eSCy Schubert {
20*e0c4386eSCy Schubert BIO *in = NULL, *out = NULL, *tbio = NULL, *dcont = NULL;
21*e0c4386eSCy Schubert X509 *rcert = NULL;
22*e0c4386eSCy Schubert EVP_PKEY *rkey = NULL;
23*e0c4386eSCy Schubert CMS_ContentInfo *cms = NULL;
24*e0c4386eSCy Schubert int ret = 1;
25*e0c4386eSCy Schubert
26*e0c4386eSCy Schubert OpenSSL_add_all_algorithms();
27*e0c4386eSCy Schubert ERR_load_crypto_strings();
28*e0c4386eSCy Schubert
29*e0c4386eSCy Schubert /* Read in recipient certificate and private key */
30*e0c4386eSCy Schubert tbio = BIO_new_file("signer.pem", "r");
31*e0c4386eSCy Schubert
32*e0c4386eSCy Schubert if (!tbio)
33*e0c4386eSCy Schubert goto err;
34*e0c4386eSCy Schubert
35*e0c4386eSCy Schubert rcert = PEM_read_bio_X509(tbio, NULL, 0, NULL);
36*e0c4386eSCy Schubert
37*e0c4386eSCy Schubert BIO_reset(tbio);
38*e0c4386eSCy Schubert
39*e0c4386eSCy Schubert rkey = PEM_read_bio_PrivateKey(tbio, NULL, 0, NULL);
40*e0c4386eSCy Schubert
41*e0c4386eSCy Schubert if (!rcert || !rkey)
42*e0c4386eSCy Schubert goto err;
43*e0c4386eSCy Schubert
44*e0c4386eSCy Schubert /* Open PEM file containing enveloped data */
45*e0c4386eSCy Schubert
46*e0c4386eSCy Schubert in = BIO_new_file("smencr.pem", "r");
47*e0c4386eSCy Schubert
48*e0c4386eSCy Schubert if (!in)
49*e0c4386eSCy Schubert goto err;
50*e0c4386eSCy Schubert
51*e0c4386eSCy Schubert /* Parse PEM content */
52*e0c4386eSCy Schubert cms = PEM_read_bio_CMS(in, NULL, 0, NULL);
53*e0c4386eSCy Schubert
54*e0c4386eSCy Schubert if (!cms)
55*e0c4386eSCy Schubert goto err;
56*e0c4386eSCy Schubert
57*e0c4386eSCy Schubert /* Open file containing detached content */
58*e0c4386eSCy Schubert dcont = BIO_new_file("smencr.out", "rb");
59*e0c4386eSCy Schubert
60*e0c4386eSCy Schubert if (!in)
61*e0c4386eSCy Schubert goto err;
62*e0c4386eSCy Schubert
63*e0c4386eSCy Schubert out = BIO_new_file("encrout.txt", "w");
64*e0c4386eSCy Schubert if (!out)
65*e0c4386eSCy Schubert goto err;
66*e0c4386eSCy Schubert
67*e0c4386eSCy Schubert /* Decrypt S/MIME message */
68*e0c4386eSCy Schubert if (!CMS_decrypt(cms, rkey, rcert, dcont, out, 0))
69*e0c4386eSCy Schubert goto err;
70*e0c4386eSCy Schubert
71*e0c4386eSCy Schubert ret = 0;
72*e0c4386eSCy Schubert
73*e0c4386eSCy Schubert err:
74*e0c4386eSCy Schubert
75*e0c4386eSCy Schubert if (ret) {
76*e0c4386eSCy Schubert fprintf(stderr, "Error Decrypting Data\n");
77*e0c4386eSCy Schubert ERR_print_errors_fp(stderr);
78*e0c4386eSCy Schubert }
79*e0c4386eSCy Schubert
80*e0c4386eSCy Schubert CMS_ContentInfo_free(cms);
81*e0c4386eSCy Schubert X509_free(rcert);
82*e0c4386eSCy Schubert EVP_PKEY_free(rkey);
83*e0c4386eSCy Schubert BIO_free(in);
84*e0c4386eSCy Schubert BIO_free(out);
85*e0c4386eSCy Schubert BIO_free(tbio);
86*e0c4386eSCy Schubert BIO_free(dcont);
87*e0c4386eSCy Schubert return ret;
88*e0c4386eSCy Schubert }
89