| 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 signing 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;
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| 18 | X509 *scert = NULL;
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| 19 | EVP_PKEY *skey = NULL;
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| 20 | PKCS7 *p7 = NULL;
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| 21 | int ret = 1;
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| 22 |
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| 23 | /*
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| 24 | * For simple S/MIME signing use PKCS7_DETACHED. On OpenSSL 0.9.9 only:
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| 25 | * for streaming detached set PKCS7_DETACHED|PKCS7_STREAM for streaming
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| 26 | * non-detached set PKCS7_STREAM
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| 27 | */
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| 28 | int flags = PKCS7_DETACHED | PKCS7_STREAM;
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| 29 |
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| 30 | OpenSSL_add_all_algorithms();
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| 31 | ERR_load_crypto_strings();
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| 32 |
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| 33 | /* Read in signer certificate and private key */
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| 34 | tbio = BIO_new_file("signer.pem", "r");
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| 35 |
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| 36 | if (!tbio)
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| 37 | goto err;
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| 38 |
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| 39 | scert = PEM_read_bio_X509(tbio, NULL, 0, NULL);
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| 40 |
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| 41 | BIO_reset(tbio);
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| 42 |
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| 43 | skey = PEM_read_bio_PrivateKey(tbio, NULL, 0, NULL);
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| 44 |
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| 45 | if (!scert || !skey)
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| 46 | goto err;
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| 47 |
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| 48 | /* Open content being signed */
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| 49 |
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| 50 | in = BIO_new_file("sign.txt", "r");
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| 51 |
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| 52 | if (!in)
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| 53 | goto err;
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| 54 |
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| 55 | /* Sign content */
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| 56 | p7 = PKCS7_sign(scert, skey, NULL, in, flags);
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| 57 |
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| 58 | if (!p7)
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| 59 | goto err;
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| 60 |
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| 61 | out = BIO_new_file("smout.txt", "w");
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| 62 | if (!out)
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| 63 | goto err;
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| 64 |
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| 65 | if (!(flags & PKCS7_STREAM))
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| 66 | BIO_reset(in);
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| 67 |
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| 68 | /* Write out S/MIME message */
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| 69 | if (!SMIME_write_PKCS7(out, p7, in, flags))
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| 70 | goto err;
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| 71 |
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| 72 | ret = 0;
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| 73 |
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| 74 | err:
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| 75 | if (ret) {
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| 76 | fprintf(stderr, "Error Signing Data\n");
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| 77 | ERR_print_errors_fp(stderr);
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| 78 | }
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| 79 | PKCS7_free(p7);
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| 80 | X509_free(scert);
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| 81 | EVP_PKEY_free(skey);
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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 |
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| 86 | return ret;
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| 87 |
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| 88 | }
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