110 lines
4.0 KiB
HTML
Executable File
110 lines
4.0 KiB
HTML
Executable File
<?xml version="1.0" ?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<title>SM2</title>
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<meta http-equiv="content-type" content="text/html; charset=utf-8" />
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<link rev="made" href="mailto:root@localhost" />
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</head>
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<body style="background-color: white">
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<!-- INDEX BEGIN -->
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<div name="index">
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<p><a name="__index__"></a></p>
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<ul>
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<li><a href="#name">NAME</a></li>
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<li><a href="#description">DESCRIPTION</a></li>
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<li><a href="#notes">NOTES</a></li>
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<li><a href="#examples">EXAMPLES</a></li>
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<li><a href="#see_also">SEE ALSO</a></li>
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<li><a href="#copyright">COPYRIGHT</a></li>
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</ul>
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<hr name="index" />
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</div>
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<!-- INDEX END -->
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<p>
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</p>
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<hr />
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<h1><a name="name">NAME</a></h1>
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<p>SM2 - Chinese SM2 signature and encryption algorithm support</p>
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<p>
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</p>
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<hr />
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<h1><a name="description">DESCRIPTION</a></h1>
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<p>The <strong>SM2</strong> algorithm was first defined by the Chinese national standard GM/T
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0003-2012 and was later standardized by ISO as ISO/IEC 14888. <strong>SM2</strong> is actually
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an elliptic curve based algorithm. The current implementation in OpenSSL supports
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both signature and encryption schemes via the EVP interface.</p>
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<p>When doing the <strong>SM2</strong> signature algorithm, it requires a distinguishing identifier
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to form the message prefix which is hashed before the real message is hashed.</p>
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<p>
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</p>
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<hr />
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<h1><a name="notes">NOTES</a></h1>
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<p><strong>SM2</strong> signatures can be generated by using the 'DigestSign' series of APIs, for
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instance, <code>EVP_DigestSignInit()</code>, <code>EVP_DigestSignUpdate()</code> and <code>EVP_DigestSignFinal()</code>.
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Ditto for the verification process by calling the 'DigestVerify' series of APIs.</p>
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<p>There are several special steps that need to be done before computing an <strong>SM2</strong>
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signature.</p>
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<p>The <strong>EVP_PKEY</strong> structure will default to using ECDSA for signatures when it is
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created. It should be set to <strong>EVP_PKEY_SM2</strong> by calling:</p>
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<pre>
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EVP_PKEY_set_alias_type(pkey, EVP_PKEY_SM2);</pre>
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<p>Then an ID should be set by calling:</p>
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<pre>
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EVP_PKEY_CTX_set1_id(pctx, id, id_len);</pre>
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<p>When calling the <code>EVP_DigestSignInit()</code> or <code>EVP_DigestVerifyInit()</code> functions, a
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pre-allocated <strong>EVP_PKEY_CTX</strong> should be assigned to the <strong>EVP_MD_CTX</strong>. This is
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done by calling:</p>
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<pre>
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EVP_MD_CTX_set_pkey_ctx(mctx, pctx);</pre>
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<p>And normally there is no need to pass a <strong>pctx</strong> parameter to <code>EVP_DigestSignInit()</code>
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or <code>EVP_DigestVerifyInit()</code> in such a scenario.</p>
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<p>
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</p>
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<hr />
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<h1><a name="examples">EXAMPLES</a></h1>
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<p>This example demonstrates the calling sequence for using an <strong>EVP_PKEY</strong> to verify
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a message with the SM2 signature algorithm and the SM3 hash algorithm:</p>
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<pre>
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#include <openssl/evp.h></pre>
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<pre>
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/* obtain an EVP_PKEY using whatever methods... */
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EVP_PKEY_set_alias_type(pkey, EVP_PKEY_SM2);
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mctx = EVP_MD_CTX_new();
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pctx = EVP_PKEY_CTX_new(pkey, NULL);
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EVP_PKEY_CTX_set1_id(pctx, id, id_len);
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EVP_MD_CTX_set_pkey_ctx(mctx, pctx);;
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EVP_DigestVerifyInit(mctx, NULL, EVP_sm3(), NULL, pkey);
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EVP_DigestVerifyUpdate(mctx, msg, msg_len);
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EVP_DigestVerifyFinal(mctx, sig, sig_len)</pre>
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<p>
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</p>
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<hr />
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<h1><a name="see_also">SEE ALSO</a></h1>
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<p><em>EVP_PKEY_CTX_new(3)</em>,
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<em>EVP_PKEY_set_alias_type(3)</em>,
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<em>EVP_DigestSignInit(3)</em>,
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<em>EVP_DigestVerifyInit(3)</em>,
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<em>EVP_PKEY_CTX_set1_id(3)</em>,
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<em>EVP_MD_CTX_set_pkey_ctx(3)</em></p>
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<p>
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</p>
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<hr />
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<h1><a name="copyright">COPYRIGHT</a></h1>
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<p>Copyright 2018-2019 The OpenSSL Project Authors. All Rights Reserved.</p>
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<p>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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<a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p>
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</body>
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</html>
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