CMS compressed data examples. (47a6d388) · Commits · CYBER - Cyber Security / TS 103 523 MSP / TLMSP / TLMSP OpenSSL

demos/cms/cms_comp.c

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		/* Simple S/MIME compress example */
		#include <openssl/pem.h>
		#include <openssl/cms.h>
		#include <openssl/err.h>

		int main(int argc, char **argv)
		{
		BIO in = NULL, out = NULL;
		CMS_ContentInfo *cms = NULL;
		int ret = 1;

		/*
		* On OpenSSL 0.9.9 only:
		* for streaming set CMS_STREAM
		*/
		int flags = CMS_STREAM;

		OpenSSL_add_all_algorithms();
		ERR_load_crypto_strings();

		/* Open content being compressed */

		in = BIO_new_file("comp.txt", "r");

		if (!in)
		goto err;

		/* compress content */
		cms = CMS_compress(in, NID_zlib_compression, flags);

		if (!cms)
		goto err;

		out = BIO_new_file("smcomp.txt", "w");
		if (!out)
		goto err;

		/* Write out S/MIME message */
		if (!SMIME_write_CMS(out, cms, in, flags))
		goto err;

		ret = 0;

		err:

		if (ret)
		{
		fprintf(stderr, "Error Compressing Data\n");
		ERR_print_errors_fp(stderr);
		}

		if (cms)
		CMS_ContentInfo_free(cms);
		if (in)
		BIO_free(in);
		if (out)
		BIO_free(out);

		return ret;

		}

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		/* Simple S/MIME uncompression example */
		#include <openssl/pem.h>
		#include <openssl/cms.h>
		#include <openssl/err.h>

		int main(int argc, char **argv)
		{
		BIO in = NULL, out = NULL;
		CMS_ContentInfo *cms = NULL;
		int ret = 1;

		OpenSSL_add_all_algorithms();
		ERR_load_crypto_strings();

		/* Open compressed content */

		in = BIO_new_file("smcomp.txt", "r");

		if (!in)
		goto err;

		/* Sign content */
		cms = SMIME_read_CMS(in, NULL);

		if (!cms)
		goto err;

		out = BIO_new_file("smuncomp.txt", "w");
		if (!out)
		goto err;

		/* Uncompress S/MIME message */
		if (!CMS_uncompress(cms, out, NULL, 0))
		goto err;

		ret = 0;

		err:

		if (ret)
		{
		fprintf(stderr, "Error Uncompressing Data\n");
		ERR_print_errors_fp(stderr);
		}

		if (cms)
		CMS_ContentInfo_free(cms);

		if (in)
		BIO_free(in);
		if (out)
		BIO_free(out);

		return ret;

		}

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