| 1 | /*
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| 2 | * Copyright 2007-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | /* Simple S/MIME verification example */
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| 11 | #include <openssl/pem.h>
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| 12 | #include <openssl/pkcs7.h>
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| 13 | #include <openssl/err.h>
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| 14 |
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| 15 | int main(int argc, char **argv)
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| 16 | {
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| 17 | BIO *in = NULL, *out = NULL, *tbio = NULL, *cont = NULL;
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| 18 | X509_STORE *st = NULL;
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| 19 | X509 *cacert = NULL;
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| 20 | PKCS7 *p7 = NULL;
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| 21 | int ret = EXIT_FAILURE;
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| 22 |
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| 23 | OpenSSL_add_all_algorithms();
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| 24 | ERR_load_crypto_strings();
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| 25 |
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| 26 | /* Set up trusted CA certificate store */
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| 27 |
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| 28 | st = X509_STORE_new();
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| 29 | if (st == NULL)
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| 30 | goto err;
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| 31 |
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| 32 | /* Read in signer certificate and private key */
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| 33 | tbio = BIO_new_file("cacert.pem", "r");
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| 34 |
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| 35 | if (tbio == NULL)
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| 36 | goto err;
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| 37 |
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| 38 | cacert = PEM_read_bio_X509(tbio, NULL, 0, NULL);
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| 39 |
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| 40 | if (cacert == NULL)
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| 41 | goto err;
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| 42 |
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| 43 | if (!X509_STORE_add_cert(st, cacert))
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| 44 | goto err;
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| 45 |
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| 46 | /* Open content being signed */
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| 47 |
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| 48 | in = BIO_new_file("smout.txt", "r");
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| 49 |
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| 50 | if (in == NULL)
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| 51 | goto err;
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| 52 |
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| 53 | /* Sign content */
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| 54 | p7 = SMIME_read_PKCS7(in, &cont);
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| 55 |
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| 56 | if (p7 == NULL)
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| 57 | goto err;
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| 58 |
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| 59 | /* File to output verified content to */
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| 60 | out = BIO_new_file("smver.txt", "w");
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| 61 | if (out == NULL)
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| 62 | goto err;
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| 63 |
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| 64 | if (!PKCS7_verify(p7, NULL, st, cont, out, 0)) {
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| 65 | fprintf(stderr, "Verification Failure\n");
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| 66 | goto err;
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| 67 | }
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| 68 |
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| 69 | fprintf(stderr, "Verification Successful\n");
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| 70 |
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| 71 | ret = EXIT_SUCCESS;
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| 72 |
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| 73 | err:
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| 74 | if (ret != EXIT_SUCCESS) {
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| 75 | fprintf(stderr, "Error Verifying Data\n");
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| 76 | ERR_print_errors_fp(stderr);
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| 77 | }
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| 78 |
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| 79 | X509_STORE_free(st);
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| 80 | PKCS7_free(p7);
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| 81 | X509_free(cacert);
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| 82 | BIO_free(in);
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| 83 | BIO_free(out);
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| 84 | BIO_free(tbio);
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| 85 | return ret;
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| 86 | }
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