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3185605Skmacy<title>Heimdal crypto library: example_evp_cipher.c</title>
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22185605Skmacy<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>.<p>
23185605Skmacy<div class="fragment"><pre class="fragment"><span class="comment">/*</span>
24185605Skmacy<span class="comment"> * Copyright (c) 2008 Kungliga Tekniska H��gskolan</span>
25185605Skmacy<span class="comment"> * (Royal Institute of Technology, Stockholm, Sweden).</span>
26185605Skmacy<span class="comment"> * All rights reserved.</span>
27185605Skmacy<span class="comment"> *</span>
28185605Skmacy<span class="comment"> * Redistribution and use in source and binary forms, with or without</span>
29185605Skmacy<span class="comment"> * modification, are permitted provided that the following conditions</span>
30185605Skmacy<span class="comment"> * are met:</span>
31185605Skmacy<span class="comment"> *</span>
32185605Skmacy<span class="comment"> * 1. Redistributions of source code must retain the above copyright</span>
33185605Skmacy<span class="comment"> *    notice, this list of conditions and the following disclaimer.</span>
34185605Skmacy<span class="comment"> *</span>
35185605Skmacy<span class="comment"> * 2. Redistributions in binary form must reproduce the above copyright</span>
36185605Skmacy<span class="comment"> *    notice, this list of conditions and the following disclaimer in the</span>
37185605Skmacy<span class="comment"> *    documentation and/or other materials provided with the distribution.</span>
38185605Skmacy<span class="comment"> *</span>
39185605Skmacy<span class="comment"> * 3. Neither the name of the Institute nor the names of its contributors</span>
40185605Skmacy<span class="comment"> *    may be used to endorse or promote products derived from this software</span>
41185605Skmacy<span class="comment"> *    without specific prior written permission.</span>
42185605Skmacy<span class="comment"> *</span>
43185605Skmacy<span class="comment"> * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND</span>
44185605Skmacy<span class="comment"> * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE</span>
45185605Skmacy<span class="comment"> * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE</span>
46185605Skmacy<span class="comment"> * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE</span>
47185605Skmacy<span class="comment"> * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL</span>
48185605Skmacy<span class="comment"> * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS</span>
49185605Skmacy<span class="comment"> * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)</span>
50185605Skmacy<span class="comment"> * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT</span>
51185605Skmacy<span class="comment"> * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY</span>
52185605Skmacy<span class="comment"> * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF</span>
53185605Skmacy<span class="comment"> * SUCH DAMAGE.</span>
54185605Skmacy<span class="comment"> */</span>
55185605Skmacy
56185605Skmacy<span class="preprocessor">#include &lt;krb5-types.h&gt;</span> <span class="comment">/* should really be stdint.h */</span>
57185605Skmacy<span class="preprocessor">#include &lt;hcrypto/evp.h&gt;</span>
58185605Skmacy
59185605Skmacy<span class="preprocessor">#include &lt;stdio.h&gt;</span>
60185605Skmacy<span class="preprocessor">#include &lt;stdlib.h&gt;</span>
61185605Skmacy<span class="preprocessor">#include &lt;string.h&gt;</span>
62185605Skmacy<span class="preprocessor">#include &lt;err.h&gt;</span>
63185605Skmacy<span class="preprocessor">#include &lt;assert.h&gt;</span>
64185605Skmacy
65185605Skmacy<span class="preprocessor">#include "roken.h"</span>
66185605Skmacy
67185605Skmacy<span class="comment">/* key and initial vector */</span>
68185605Skmacy<span class="keyword">static</span> <span class="keywordtype">char</span> key[16] =
69185605Skmacy    <span class="stringliteral">"\xaa\xbb\x45\xd4\xaa\xbb\x45\xd4"</span>
70185605Skmacy    <span class="stringliteral">"\xaa\xbb\x45\xd4\xaa\xbb\x45\xd4"</span>;
71185605Skmacy<span class="keyword">static</span> <span class="keywordtype">char</span> ivec[16] =
72185605Skmacy    <span class="stringliteral">"\xaa\xbb\x45\xd4\xaa\xbb\x45\xd4"</span>
73185605Skmacy    <span class="stringliteral">"\xaa\xbb\x45\xd4\xaa\xbb\x45\xd4"</span>;
74185605Skmacy
75185605Skmacy<span class="keyword">static</span> <span class="keywordtype">void</span>
76185605Skmacyusage(<span class="keywordtype">int</span> exit_code) __attribute__((noreturn));
77185605Skmacy
78185605Skmacy<span class="keyword">static</span> <span class="keywordtype">void</span>
79185605Skmacyusage(<span class="keywordtype">int</span> exit_code)
80185605Skmacy{
81185605Skmacy    printf(<span class="stringliteral">"usage: %s in out\n"</span>, getprogname());
82185605Skmacy    exit(exit_code);
83185605Skmacy}
84185605Skmacy
85185605Skmacy
86185605Skmacy<span class="keywordtype">int</span>
87185605Skmacymain(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> **argv)
88185605Skmacy{
89185605Skmacy    <span class="keywordtype">int</span> encryptp = 1;
90185605Skmacy    <span class="keyword">const</span> <span class="keywordtype">char</span> *ifn = NULL, *ofn = NULL;
91185605Skmacy    FILE *in, *out;
92185605Skmacy    <span class="keywordtype">void</span> *ibuf, *obuf;
93185605Skmacy    <span class="keywordtype">int</span> ilen, olen;
94185605Skmacy    <span class="keywordtype">size_t</span> block_size = 0;
95185605Skmacy    <span class="keyword">const</span> EVP_CIPHER *c = <a name="a0"></a><a class="code" href="group__hcrypto__evp.html#g2747bac943db15c97167ac37fdc2af43">EVP_aes_128_cbc</a>();
96185605Skmacy    EVP_CIPHER_CTX ctx;
97185605Skmacy    <span class="keywordtype">int</span> ret;
98185605Skmacy
99185605Skmacy    setprogname(argv[0]);
100185605Skmacy
101185605Skmacy    <span class="keywordflow">if</span> (argc == 2) {
102185605Skmacy        <span class="keywordflow">if</span> (strcmp(argv[1], <span class="stringliteral">"--version"</span>) == 0) {
103185605Skmacy            printf(<span class="stringliteral">"version"</span>);
104185605Skmacy            exit(0);
105185605Skmacy        }
106185605Skmacy        <span class="keywordflow">if</span> (strcmp(argv[1], <span class="stringliteral">"--help"</span>) == 0)
107185605Skmacy            usage(0);
108185605Skmacy        usage(1);
109185605Skmacy    } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (argc == 4) {
110185605Skmacy        block_size = atoi(argv[1]);
111185605Skmacy        <span class="keywordflow">if</span> (block_size == 0)
112185605Skmacy            errx(1, <span class="stringliteral">"invalid blocksize %s"</span>, argv[1]);
113185605Skmacy        ifn = argv[2];
114185605Skmacy        ofn = argv[3];
115185605Skmacy    } <span class="keywordflow">else</span>
116185605Skmacy        usage(1);
117185605Skmacy
118185605Skmacy    in = fopen(ifn, <span class="stringliteral">"r"</span>);
119185605Skmacy    <span class="keywordflow">if</span> (in == NULL)
120185605Skmacy        errx(1, <span class="stringliteral">"failed to open input file"</span>);
121185605Skmacy    out = fopen(ofn, <span class="stringliteral">"w+"</span>);
122185605Skmacy    <span class="keywordflow">if</span> (out == NULL)
123185605Skmacy        errx(1, <span class="stringliteral">"failed to open output file"</span>);
124185605Skmacy
125185605Skmacy    <span class="comment">/* Check that key and ivec are long enough */</span>
126185605Skmacy    assert(<a name="a1"></a><a class="code" href="group__hcrypto__evp.html#g4793a9e130da86ac42c497b19395b748">EVP_CIPHER_key_length</a>(c) &lt;= <span class="keyword">sizeof</span>(key));
127185605Skmacy    assert(<a name="a2"></a><a class="code" href="group__hcrypto__evp.html#g7edebe76d19dee11686a6698d24f19f5">EVP_CIPHER_iv_length</a>(c) &lt;= <span class="keyword">sizeof</span>(ivec));
128185605Skmacy
129185605Skmacy    <span class="comment">/*</span>
130185605Skmacy<span class="comment">     * Allocate buffer, the output buffer is at least</span>
131185605Skmacy<span class="comment">     * EVP_CIPHER_block_size() longer</span>
132185605Skmacy<span class="comment">     */</span>
133185605Skmacy    ibuf = malloc(block_size);
134185605Skmacy    obuf = malloc(block_size + <a name="a3"></a><a class="code" href="group__hcrypto__evp.html#g3123ff4b426783dd972538249b9e9d4d">EVP_CIPHER_block_size</a>(c));
135185605Skmacy
136185605Skmacy    <span class="comment">/*</span>
137185605Skmacy<span class="comment">     * Init the memory used for EVP_CIPHER_CTX and set the key and</span>
138185605Skmacy<span class="comment">     * ivec.</span>
139185605Skmacy<span class="comment">     */</span>
140185605Skmacy    <a name="a4"></a><a class="code" href="group__hcrypto__evp.html#g13d0ff0e87312566cb6b3591157f9754">EVP_CIPHER_CTX_init</a>(&amp;ctx);
141185605Skmacy    <a name="a5"></a><a class="code" href="group__hcrypto__evp.html#g98da5a5c1aa25d9cb2e4717fa11314bd">EVP_CipherInit_ex</a>(&amp;ctx, c, NULL, key, ivec, encryptp);
142185605Skmacy
143185605Skmacy    <span class="comment">/* read in buffer */</span>
144185605Skmacy    <span class="keywordflow">while</span> ((ilen = fread(ibuf, 1, block_size, in)) &gt; 0) {
145185605Skmacy        <span class="comment">/* encrypto/decrypt */</span>
146185605Skmacy        ret = <a name="a6"></a><a class="code" href="group__hcrypto__evp.html#g863349e1001b36cfd6c4afedddd12862">EVP_CipherUpdate</a>(&amp;ctx, obuf, &amp;olen, ibuf, ilen);
147185605Skmacy        <span class="keywordflow">if</span> (ret != 1) {
148185605Skmacy            <a name="a7"></a><a class="code" href="group__hcrypto__evp.html#gc16dd3987cd90c8bcdbad5290c558359">EVP_CIPHER_CTX_cleanup</a>(&amp;ctx);
149185605Skmacy            errx(1, <span class="stringliteral">"EVP_CipherUpdate failed"</span>);
150185605Skmacy        }
151185605Skmacy        <span class="comment">/* write out to output file */</span>
152185605Skmacy        fwrite(obuf, 1, olen, out);
153185605Skmacy    }
154185605Skmacy    <span class="comment">/* done reading */</span>
155185605Skmacy    fclose(in);
156185605Skmacy
157185605Skmacy    <span class="comment">/* clear up any last bytes left in the output buffer */</span>
158185605Skmacy    ret = <a name="a8"></a><a class="code" href="group__hcrypto__evp.html#g714eef7d737fd68171d852043a4995de">EVP_CipherFinal_ex</a>(&amp;ctx, obuf, &amp;olen);
159185605Skmacy    <a class="code" href="group__hcrypto__evp.html#gc16dd3987cd90c8bcdbad5290c558359">EVP_CIPHER_CTX_cleanup</a>(&amp;ctx);
160185605Skmacy    <span class="keywordflow">if</span> (ret != 1)
161185605Skmacy        errx(1, <span class="stringliteral">"EVP_CipherFinal_ex failed"</span>);
162185605Skmacy
163185605Skmacy    <span class="comment">/* write the last bytes out and close */</span>
164185605Skmacy    fwrite(obuf, 1, olen, out);
165185605Skmacy    fclose(out);
166185605Skmacy
167185605Skmacy    <span class="keywordflow">return</span> 0;
168185605Skmacy}
169185605Skmacy</pre></div> </div>
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