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<div class="title">lax_der_parsing.h</div> </div>
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<a href="lax__der__parsing_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/**********************************************************************</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> * Copyright (c) 2015 Pieter Wuille *</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> * Distributed under the MIT software license, see the accompanying *</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> * file COPYING or http://www.opensource.org/licenses/mit-license.php.*</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> **********************************************************************/</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> </div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">/****</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * Please do not link this file directly. It is not part of the libsecp256k1</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * project and does not promise any stability in its API, functionality or</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> * presence. Projects which use this code should instead copy this header</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> * and its accompanying .c file directly into their codebase.</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> ****/</span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> </div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment">/* This file defines a function that parses DER with various errors and</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * violations. This is not a part of the library itself, because the allowed</span></div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> * violations are chosen arbitrarily and do not follow or establish any</span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * standard.</span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> *</span></div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> * In many places it matters that different implementations do not only accept</span></div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> * the same set of valid signatures, but also reject the same set of signatures.</span></div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> * The only means to accomplish that is by strictly obeying a standard, and not</span></div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment"> * accepting anything else.</span></div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment"> *</span></div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment"> * Nonetheless, sometimes there is a need for compatibility with systems that</span></div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment"> * use signatures which do not strictly obey DER. The snippet below shows how</span></div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> * certain violations are easily supported. You may need to adapt it.</span></div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> *</span></div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment"> * Do not use this for new systems. Use well-defined DER or compact signatures</span></div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment"> * instead if you have the choice (see secp256k1_ecdsa_signature_parse_der and</span></div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment"> * secp256k1_ecdsa_signature_parse_compact).</span></div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment"> *</span></div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment"> * The supported violations are:</span></div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment"> * - All numbers are parsed as nonnegative integers, even though X.609-0207</span></div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment"> * section 8.3.3 specifies that integers are always encoded as two's</span></div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment"> * complement.</span></div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment"> * - Integers can have length 0, even though section 8.3.1 says they can't.</span></div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment"> * - Integers with overly long padding are accepted, violation section</span></div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment"> * 8.3.2.</span></div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment"> * - 127-byte long length descriptors are accepted, even though section</span></div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment"> * 8.1.3.5.c says that they are not.</span></div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment"> * - Trailing garbage data inside or after the signature is ignored.</span></div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment"> * - The length descriptor of the sequence is ignored.</span></div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="comment"> *</span></div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="comment"> * Compared to for example OpenSSL, many violations are NOT supported:</span></div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="comment"> * - Using overly long tag descriptors for the sequence or integers inside,</span></div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="comment"> * violating section 8.1.2.2.</span></div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="comment"> * - Encoding primitive integers as constructed values, violating section</span></div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="comment"> * 8.3.1.</span></div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="comment"> */</span></div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> </div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="preprocessor">#ifndef _SECP256K1_CONTRIB_LAX_DER_PARSING_H_</span></div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="preprocessor">#define _SECP256K1_CONTRIB_LAX_DER_PARSING_H_</span></div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span> </div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="preprocessor">#include <<a class="code" href="secp256k1_8h.html">secp256k1.h</a>></span></div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span> </div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="preprocessor"># ifdef __cplusplus</span></div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="keyword">extern</span> <span class="stringliteral">"C"</span> {</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="preprocessor"># endif</span></div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span> </div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="keywordtype">int</span> <a class="code" href="lax__der__parsing_8h.html#a8c6e1225540c46bf7080cabde2c4e691">ecdsa_signature_parse_der_lax</a>(</div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="keyword">const</span> <a class="code" href="structsecp256k1__context__struct.html">secp256k1_context</a>* <a class="code" href="tests_8c.html#a06a3e29ada83211a695a49e8f7405842">ctx</a>,</div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <a class="code" href="structsecp256k1__ecdsa__signature.html">secp256k1_ecdsa_signature</a>* sig,</div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *input,</div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="keywordtype">size_t</span> inputlen</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span> ) <a class="code" href="secp256k1_8h.html#a03c194d8fa91b9b66758b36c91e0b5cb">SECP256K1_ARG_NONNULL</a>(1) <a class="code" href="secp256k1_8h.html#a03c194d8fa91b9b66758b36c91e0b5cb">SECP256K1_ARG_NONNULL</a>(2) <a class="code" href="secp256k1_8h.html#a03c194d8fa91b9b66758b36c91e0b5cb">SECP256K1_ARG_NONNULL</a>(3);</div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span> </div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <span class="preprocessor">#ifdef __cplusplus</span></div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span> }</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span> </div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="preprocessor">#endif</span></div><div class="ttc" id="structsecp256k1__context__struct_html"><div class="ttname"><a href="structsecp256k1__context__struct.html">secp256k1_context_struct</a></div><div class="ttdef"><b>Definition:</b> <a href="secp256k1_8c_source.html#l00053">secp256k1.c:53</a></div></div>
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<div class="ttc" id="tests_8c_html_a06a3e29ada83211a695a49e8f7405842"><div class="ttname"><a href="tests_8c.html#a06a3e29ada83211a695a49e8f7405842">ctx</a></div><div class="ttdeci">static secp256k1_context * ctx</div><div class="ttdef"><b>Definition:</b> <a href="tests_8c_source.html#l00042">tests.c:42</a></div></div>
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<div class="ttc" id="lax__der__parsing_8h_html_a8c6e1225540c46bf7080cabde2c4e691"><div class="ttname"><a href="lax__der__parsing_8h.html#a8c6e1225540c46bf7080cabde2c4e691">ecdsa_signature_parse_der_lax</a></div><div class="ttdeci">int ecdsa_signature_parse_der_lax(const secp256k1_context *ctx, secp256k1_ecdsa_signature *sig, const unsigned char *input, size_t inputlen) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3)</div><div class="ttdef"><b>Definition:</b> <a href="lax__der__parsing_8c_source.html#l00012">lax_der_parsing.c:12</a></div></div>
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<div class="ttc" id="structsecp256k1__ecdsa__signature_html"><div class="ttname"><a href="structsecp256k1__ecdsa__signature.html">secp256k1_ecdsa_signature</a></div><div class="ttdef"><b>Definition:</b> <a href="secp256k1_8h_source.html#l00072">secp256k1.h:72</a></div></div>
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<div class="ttc" id="secp256k1_8h_html_a03c194d8fa91b9b66758b36c91e0b5cb"><div class="ttname"><a href="secp256k1_8h.html#a03c194d8fa91b9b66758b36c91e0b5cb">SECP256K1_ARG_NONNULL</a></div><div class="ttdeci">#define SECP256K1_ARG_NONNULL(_x)</div><div class="ttdef"><b>Definition:</b> <a href="secp256k1_8h_source.html#l00147">secp256k1.h:147</a></div></div>
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<div class="ttc" id="secp256k1_8h_html"><div class="ttname"><a href="secp256k1_8h.html">secp256k1.h</a></div></div>
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