| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2008-2016 The OpenSSL Project Authors. All Rights Reserved. |
| 3 | * |
| 4 | * Licensed under the OpenSSL license (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 | /* |
| 11 | * S/MIME detached data decrypt example: rarely done but should the need |
| 12 | * arise this is an example.... |
| 13 | */ |
| 14 | #include <openssl/pem.h> |
| 15 | #include <openssl/cms.h> |
| 16 | #include <openssl/err.h> |
| 17 | |
| 18 | int main(int argc, char **argv) |
| 19 | { |
| 20 | BIO *in = NULL, *out = NULL, *tbio = NULL, *dcont = NULL; |
| 21 | X509 *rcert = NULL; |
| 22 | EVP_PKEY *rkey = NULL; |
| 23 | CMS_ContentInfo *cms = NULL; |
| 24 | int ret = 1; |
| 25 | |
| 26 | OpenSSL_add_all_algorithms(); |
| 27 | ERR_load_crypto_strings(); |
| 28 | |
| 29 | /* Read in recipient certificate and private key */ |
| 30 | tbio = BIO_new_file("signer.pem", "r"); |
| 31 | |
| 32 | if (!tbio) |
| 33 | goto err; |
| 34 | |
| 35 | rcert = PEM_read_bio_X509(tbio, NULL, 0, NULL); |
| 36 | |
| 37 | BIO_reset(tbio); |
| 38 | |
| 39 | rkey = PEM_read_bio_PrivateKey(tbio, NULL, 0, NULL); |
| 40 | |
| 41 | if (!rcert || !rkey) |
| 42 | goto err; |
| 43 | |
| 44 | /* Open PEM file containing enveloped data */ |
| 45 | |
| 46 | in = BIO_new_file("smencr.pem", "r"); |
| 47 | |
| 48 | if (!in) |
| 49 | goto err; |
| 50 | |
| 51 | /* Parse PEM content */ |
| 52 | cms = PEM_read_bio_CMS(in, NULL, 0, NULL); |
| 53 | |
| 54 | if (!cms) |
| 55 | goto err; |
| 56 | |
| 57 | /* Open file containing detached content */ |
| 58 | dcont = BIO_new_file("smencr.out", "rb"); |
| 59 | |
| 60 | if (!in) |
| 61 | goto err; |
| 62 | |
| 63 | out = BIO_new_file("encrout.txt", "w"); |
| 64 | if (!out) |
| 65 | goto err; |
| 66 | |
| 67 | /* Decrypt S/MIME message */ |
| 68 | if (!CMS_decrypt(cms, rkey, rcert, dcont, out, 0)) |
| 69 | goto err; |
| 70 | |
| 71 | ret = 0; |
| 72 | |
| 73 | err: |
| 74 | |
| 75 | if (ret) { |
| 76 | fprintf(stderr, "Error Decrypting Data\n"); |
| 77 | ERR_print_errors_fp(stderr); |
| 78 | } |
| 79 | |
| 80 | CMS_ContentInfo_free(cms); |
| 81 | X509_free(rcert); |
| 82 | EVP_PKEY_free(rkey); |
| 83 | BIO_free(in); |
| 84 | BIO_free(out); |
| 85 | BIO_free(tbio); |
| 86 | BIO_free(dcont); |
| 87 | return ret; |
| 88 | } |