/*
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* Copyright 2008-2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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/* Simple S/MIME compress example */
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#include <openssl/pem.h>
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#include <openssl/cms.h>
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#include <openssl/err.h>
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int main(int argc, char **argv)
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{
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BIO *in = NULL, *out = NULL;
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CMS_ContentInfo *cms = NULL;
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int ret = 1;
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/*
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* On OpenSSL 1.0.0+ only:
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* for streaming set CMS_STREAM
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*/
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int flags = CMS_STREAM;
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OpenSSL_add_all_algorithms();
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ERR_load_crypto_strings();
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/* Open content being compressed */
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in = BIO_new_file("comp.txt", "r");
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if (!in)
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goto err;
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/* compress content */
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cms = CMS_compress(in, NID_zlib_compression, flags);
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if (!cms)
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goto err;
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out = BIO_new_file("smcomp.txt", "w");
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if (!out)
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goto err;
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/* Write out S/MIME message */
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if (!SMIME_write_CMS(out, cms, in, flags))
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goto err;
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ret = 0;
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err:
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if (ret) {
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fprintf(stderr, "Error Compressing Data\n");
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ERR_print_errors_fp(stderr);
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}
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CMS_ContentInfo_free(cms);
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BIO_free(in);
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BIO_free(out);
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return ret;
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}
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