| 1 | /*
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| 2 | * Copyright 2007-2023 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 encrypt 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 *rcert = NULL;
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| 19 | STACK_OF(X509) *recips = 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 | /*
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| 24 | * for streaming set PKCS7_STREAM
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| 25 | */
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| 26 | int flags = PKCS7_STREAM;
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| 27 |
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| 28 | OpenSSL_add_all_algorithms();
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| 29 | ERR_load_crypto_strings();
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| 30 |
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| 31 | /* Read in recipient certificate */
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| 32 | tbio = BIO_new_file("signer.pem", "r");
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| 33 |
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| 34 | if (!tbio)
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| 35 | goto err;
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| 36 |
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| 37 | rcert = PEM_read_bio_X509(tbio, NULL, 0, NULL);
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| 38 |
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| 39 | if (!rcert)
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| 40 | goto err;
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| 41 |
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| 42 | /* Create recipient STACK and add recipient cert to it */
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| 43 | recips = sk_X509_new_null();
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| 44 |
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| 45 | if (!recips || !sk_X509_push(recips, rcert))
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| 46 | goto err;
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| 47 |
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| 48 | /*
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| 49 | * OSSL_STACK_OF_X509_free() will free up recipient STACK and its contents
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| 50 | * so set rcert to NULL so it isn't freed up twice.
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| 51 | */
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| 52 | rcert = NULL;
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| 53 |
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| 54 | /* Open content being encrypted */
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| 55 |
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| 56 | in = BIO_new_file("encr.txt", "r");
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| 57 |
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| 58 | if (!in)
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| 59 | goto err;
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| 60 |
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| 61 | /* encrypt content */
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| 62 | p7 = PKCS7_encrypt(recips, in, EVP_des_ede3_cbc(), flags);
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| 63 |
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| 64 | if (!p7)
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| 65 | goto err;
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| 66 |
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| 67 | out = BIO_new_file("smencr.txt", "w");
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| 68 | if (!out)
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| 69 | goto err;
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| 70 |
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| 71 | /* Write out S/MIME message */
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| 72 | if (!SMIME_write_PKCS7(out, p7, in, flags))
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| 73 | goto err;
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| 74 |
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| 75 | printf("Success\n");
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| 76 |
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| 77 | ret = EXIT_SUCCESS;
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| 78 | err:
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| 79 | if (ret != EXIT_SUCCESS) {
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| 80 | fprintf(stderr, "Error Encrypting Data\n");
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| 81 | ERR_print_errors_fp(stderr);
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| 82 | }
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| 83 | PKCS7_free(p7);
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| 84 | X509_free(rcert);
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| 85 | OSSL_STACK_OF_X509_free(recips);
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| 86 | BIO_free(in);
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| 87 | BIO_free(out);
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| 88 | BIO_free(tbio);
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| 89 | return ret;
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| 90 | }
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