1 /* 2 * Copyright 2008-2016 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the Apache License 2.0 (the "License"). You may not use 5 * this file except in compliance with the License. You can obtain a copy 6 * in the file LICENSE in the source distribution or at 7 * https://www.openssl.org/source/license.html 8 */ 9 10 /* Simple S/MIME verification example */ 11 #include <openssl/pem.h> 12 #include <openssl/cms.h> 13 #include <openssl/err.h> 14 15 int main(int argc, char **argv) 16 { 17 BIO *in = NULL, *out = NULL, *tbio = NULL, *cont = NULL; 18 X509_STORE *st = NULL; 19 X509 *cacert = NULL; 20 CMS_ContentInfo *cms = NULL; 21 22 int ret = 1; 23 24 OpenSSL_add_all_algorithms(); 25 ERR_load_crypto_strings(); 26 27 /* Set up trusted CA certificate store */ 28 29 st = X509_STORE_new(); 30 if (st == NULL) 31 goto err; 32 33 /* Read in CA certificate */ 34 tbio = BIO_new_file("cacert.pem", "r"); 35 36 if (tbio == NULL) 37 goto err; 38 39 cacert = PEM_read_bio_X509(tbio, NULL, 0, NULL); 40 41 if (cacert == NULL) 42 goto err; 43 44 if (!X509_STORE_add_cert(st, cacert)) 45 goto err; 46 47 /* Open message being verified */ 48 49 in = BIO_new_file("smout.txt", "r"); 50 51 if (in == NULL) 52 goto err; 53 54 /* parse message */ 55 cms = SMIME_read_CMS(in, &cont); 56 57 if (cms == NULL) 58 goto err; 59 60 /* File to output verified content to */ 61 out = BIO_new_file("smver.txt", "w"); 62 if (out == NULL) 63 goto err; 64 65 if (!CMS_verify(cms, NULL, st, cont, out, 0)) { 66 fprintf(stderr, "Verification Failure\n"); 67 goto err; 68 } 69 70 fprintf(stderr, "Verification Successful\n"); 71 72 ret = 0; 73 74 err: 75 76 if (ret) { 77 fprintf(stderr, "Error Verifying Data\n"); 78 ERR_print_errors_fp(stderr); 79 } 80 81 X509_STORE_free(st); 82 CMS_ContentInfo_free(cms); 83 X509_free(cacert); 84 BIO_free(in); 85 BIO_free(out); 86 BIO_free(tbio); 87 return ret; 88 } 89