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Editing: exampleevpcipher_8c-example.html

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<title>Heimdal crypto library: example_evp_cipher.c</title>
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<h1>example_evp_cipher.c</h1>This is an example how to use <a class="el" href="group__hcrypto__evp.html#g98da5a5c1aa25d9cb2e4717fa11314bd">EVP_CipherInit_ex()</a>, <a class="el" href="group__hcrypto__evp.html#g863349e1001b36cfd6c4afedddd12862">EVP_CipherUpdate()</a> and <a class="el" href="group__hcrypto__evp.html#g714eef7d737fd68171d852043a4995de">EVP_CipherFinal_ex()</a>.
<div class="fragment"><pre class="fragment">/*
 * Copyright (c) 2008 Kungliga Tekniska Högskolan
 * (Royal Institute of Technology, Stockholm, Sweden).
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the Institute nor the names of its contributors
 * may be used to endorse or promote products derived from this software
 * without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include &lt;krb5-types.h&gt; /* should really be stdint.h */
#include &lt;hcrypto/evp.h&gt;

#include &lt;stdio.h&gt;
#include &lt;stdlib.h&gt;
#include &lt;string.h&gt;
#include &lt;err.h&gt;
#include &lt;assert.h&gt;

#include "roken.h"

/* key and initial vector */
static char key[16] =
 "\xaa\xbb\x45\xd4\xaa\xbb\x45\xd4"
 "\xaa\xbb\x45\xd4\xaa\xbb\x45\xd4";
static char ivec[16] =
 "\xaa\xbb\x45\xd4\xaa\xbb\x45\xd4"
 "\xaa\xbb\x45\xd4\xaa\xbb\x45\xd4";

static void
usage(int exit_code) __attribute__((noreturn));

static void
usage(int exit_code)
{
 printf("usage: %s in out\n", getprogname());
 exit(exit_code);
}

int
main(int argc, char **argv)
{
 int encryptp = 1;
 const char *ifn = NULL, *ofn = NULL;
 FILE *in, *out;
 void *ibuf, *obuf;
 int ilen, olen;
 size_t block_size = 0;
 const EVP_CIPHER *c = <a name="a0"></a><a class="code" href="group__hcrypto__evp.html#g2747bac943db15c97167ac37fdc2af43">EVP_aes_128_cbc</a>();
 EVP_CIPHER_CTX ctx;
 int ret;

setprogname(argv[0]);

if (argc == 2) {
 if (strcmp(argv[1], "--version") == 0) {
 printf("version");
 exit(0);
 }
 if (strcmp(argv[1], "--help") == 0)
 usage(0);
 usage(1);
 } else if (argc == 4) {
 block_size = atoi(argv[1]);
 if (block_size == 0)
 errx(1, "invalid blocksize %s", argv[1]);
 ifn = argv[2];
 ofn = argv[3];
 } else
 usage(1);

in = fopen(ifn, "r");
 if (in == NULL)
 errx(1, "failed to open input file");
 out = fopen(ofn, "w+");
 if (out == NULL)
 errx(1, "failed to open output file");

/* Check that key and ivec are long enough */
 assert(<a name="a1"></a><a class="code" href="group__hcrypto__evp.html#g4793a9e130da86ac42c497b19395b748">EVP_CIPHER_key_length</a>(c) &lt;= sizeof(key));
 assert(<a name="a2"></a><a class="code" href="group__hcrypto__evp.html#g7edebe76d19dee11686a6698d24f19f5">EVP_CIPHER_iv_length</a>(c) &lt;= sizeof(ivec));

/*
 * Allocate buffer, the output buffer is at least
 * EVP_CIPHER_block_size() longer
 */
 ibuf = malloc(block_size);
 obuf = malloc(block_size + <a name="a3"></a><a class="code" href="group__hcrypto__evp.html#g3123ff4b426783dd972538249b9e9d4d">EVP_CIPHER_block_size</a>(c));

/*
 * Init the memory used for EVP_CIPHER_CTX and set the key and
 * ivec.
 */
 <a name="a4"></a><a class="code" href="group__hcrypto__evp.html#g13d0ff0e87312566cb6b3591157f9754">EVP_CIPHER_CTX_init</a>(&amp;ctx);
 <a name="a5"></a><a class="code" href="group__hcrypto__evp.html#g98da5a5c1aa25d9cb2e4717fa11314bd">EVP_CipherInit_ex</a>(&amp;ctx, c, NULL, key, ivec, encryptp);

/* read in buffer */
 while ((ilen = fread(ibuf, 1, block_size, in)) &gt; 0) {
 /* encrypto/decrypt */
 ret = <a name="a6"></a><a class="code" href="group__hcrypto__evp.html#g863349e1001b36cfd6c4afedddd12862">EVP_CipherUpdate</a>(&amp;ctx, obuf, &amp;olen, ibuf, ilen);
 if (ret != 1) {
 <a name="a7"></a><a class="code" href="group__hcrypto__evp.html#gc16dd3987cd90c8bcdbad5290c558359">EVP_CIPHER_CTX_cleanup</a>(&amp;ctx);
 errx(1, "EVP_CipherUpdate failed");
 }
 /* write out to output file */
 fwrite(obuf, 1, olen, out);
 }
 /* done reading */
 fclose(in);

/* clear up any last bytes left in the output buffer */
 ret = <a name="a8"></a><a class="code" href="group__hcrypto__evp.html#g714eef7d737fd68171d852043a4995de">EVP_CipherFinal_ex</a>(&amp;ctx, obuf, &amp;olen);
 <a class="code" href="group__hcrypto__evp.html#gc16dd3987cd90c8bcdbad5290c558359">EVP_CIPHER_CTX_cleanup</a>(&amp;ctx);
 if (ret != 1)
 errx(1, "EVP_CipherFinal_ex failed");

/* write the last bytes out and close */
 fwrite(obuf, 1, olen, out);
 fclose(out);

return 0;
}
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