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 compress 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; 18 CMS_ContentInfo *cms = NULL; 19 int ret = 1; 20 21 /* 22 * On OpenSSL 1.0.0+ only: 23 * for streaming set CMS_STREAM 24 */ 25 int flags = CMS_STREAM; 26 27 OpenSSL_add_all_algorithms(); 28 ERR_load_crypto_strings(); 29 30 /* Open content being compressed */ 31 32 in = BIO_new_file("comp.txt", "r"); 33 34 if (!in) 35 goto err; 36 37 /* compress content */ 38 cms = CMS_compress(in, NID_zlib_compression, flags); 39 40 if (!cms) 41 goto err; 42 43 out = BIO_new_file("smcomp.txt", "w"); 44 if (!out) 45 goto err; 46 47 /* Write out S/MIME message */ 48 if (!SMIME_write_CMS(out, cms, in, flags)) 49 goto err; 50 51 ret = 0; 52 53 err: 54 55 if (ret) { 56 fprintf(stderr, "Error Compressing Data\n"); 57 ERR_print_errors_fp(stderr); 58 } 59 60 CMS_ContentInfo_free(cms); 61 BIO_free(in); 62 BIO_free(out); 63 return ret; 64 } 65