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<p><a name="__index__"></a></p>
<ul>
<li><a href="#name">NAME</a></li>
<li><a href="#synopsis">SYNOPSIS</a></li>
<li><a href="#description">DESCRIPTION</a></li>
<li><a href="#return_values">RETURN VALUES</a></li>
<li><a href="#see_also">SEE ALSO</a></li>
<li><a href="#history">HISTORY</a></li>
<li><a href="#copyright">COPYRIGHT</a></li>
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<p>
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<hr />
<h1><a name="name">NAME</a></h1>
<p>EVP_MD_meth_dup,
EVP_MD_meth_new, EVP_MD_meth_free, EVP_MD_meth_set_input_blocksize,
EVP_MD_meth_set_result_size, EVP_MD_meth_set_app_datasize,
EVP_MD_meth_set_flags, EVP_MD_meth_set_init, EVP_MD_meth_set_update,
EVP_MD_meth_set_final, EVP_MD_meth_set_copy, EVP_MD_meth_set_cleanup,
EVP_MD_meth_set_ctrl, EVP_MD_meth_get_input_blocksize,
EVP_MD_meth_get_result_size, EVP_MD_meth_get_app_datasize,
EVP_MD_meth_get_flags, EVP_MD_meth_get_init, EVP_MD_meth_get_update,
EVP_MD_meth_get_final, EVP_MD_meth_get_copy, EVP_MD_meth_get_cleanup,
EVP_MD_meth_get_ctrl
- Routines to build up EVP_MD methods</p>
<p>
</p>
<hr />
<h1><a name="synopsis">SYNOPSIS</a></h1>
<pre>
#include <openssl/evp.h></pre>
<pre>
EVP_MD *EVP_MD_meth_new(int md_type, int pkey_type);
void EVP_MD_meth_free(EVP_MD *md);
EVP_MD *EVP_MD_meth_dup(const EVP_MD *md);</pre>
<pre>
int EVP_MD_meth_set_input_blocksize(EVP_MD *md, int blocksize);
int EVP_MD_meth_set_result_size(EVP_MD *md, int resultsize);
int EVP_MD_meth_set_app_datasize(EVP_MD *md, int datasize);
int EVP_MD_meth_set_flags(EVP_MD *md, unsigned long flags);
int EVP_MD_meth_set_init(EVP_MD *md, int (*init)(EVP_MD_CTX *ctx));
int EVP_MD_meth_set_update(EVP_MD *md, int (*update)(EVP_MD_CTX *ctx,
const void *data,
size_t count));
int EVP_MD_meth_set_final(EVP_MD *md, int (*final)(EVP_MD_CTX *ctx,
unsigned char *md));
int EVP_MD_meth_set_copy(EVP_MD *md, int (*copy)(EVP_MD_CTX *to,
const EVP_MD_CTX *from));
int EVP_MD_meth_set_cleanup(EVP_MD *md, int (*cleanup)(EVP_MD_CTX *ctx));
int EVP_MD_meth_set_ctrl(EVP_MD *md, int (*ctrl)(EVP_MD_CTX *ctx, int cmd,
int p1, void *p2));</pre>
<pre>
int EVP_MD_meth_get_input_blocksize(const EVP_MD *md);
int EVP_MD_meth_get_result_size(const EVP_MD *md);
int EVP_MD_meth_get_app_datasize(const EVP_MD *md);
unsigned long EVP_MD_meth_get_flags(const EVP_MD *md);
int (*EVP_MD_meth_get_init(const EVP_MD *md))(EVP_MD_CTX *ctx);
int (*EVP_MD_meth_get_update(const EVP_MD *md))(EVP_MD_CTX *ctx,
const void *data,
size_t count);
int (*EVP_MD_meth_get_final(const EVP_MD *md))(EVP_MD_CTX *ctx,
unsigned char *md);
int (*EVP_MD_meth_get_copy(const EVP_MD *md))(EVP_MD_CTX *to,
const EVP_MD_CTX *from);
int (*EVP_MD_meth_get_cleanup(const EVP_MD *md))(EVP_MD_CTX *ctx);
int (*EVP_MD_meth_get_ctrl(const EVP_MD *md))(EVP_MD_CTX *ctx, int cmd,
int p1, void *p2);</pre>
<p>
</p>
<hr />
<h1><a name="description">DESCRIPTION</a></h1>
<p>The <strong>EVP_MD</strong> type is a structure for digest method implementation.
It can also have associated public/private key signing and verifying
routines.</p>
<p><code>EVP_MD_meth_new()</code> creates a new <strong>EVP_MD</strong> structure.</p>
<p><code>EVP_MD_meth_dup()</code> creates a copy of <strong>md</strong>.</p>
<p><code>EVP_MD_meth_free()</code> destroys a <strong>EVP_MD</strong> structure.</p>
<p><code>EVP_MD_meth_set_input_blocksize()</code> sets the internal input block size
for the method <strong>md</strong> to <strong>blocksize</strong> bytes.</p>
<p><code>EVP_MD_meth_set_result_size()</code> sets the size of the result that the
digest method in <strong>md</strong> is expected to produce to <strong>resultsize</strong> bytes.</p>
<p>The digest method may have its own private data, which OpenSSL will
allocate for it. <code>EVP_MD_meth_set_app_datasize()</code> should be used to
set the size for it to <strong>datasize</strong>.</p>
<p><code>EVP_MD_meth_set_flags()</code> sets the flags to describe optional
behaviours in the particular <strong>md</strong>. Several flags can be or'd
together. The available flags are:</p>
<dl>
<dt><strong><a name="evp_md_flag_oneshot" class="item">EVP_MD_FLAG_ONESHOT</a></strong></dt>
<dd>
<p>This digest method can only handle one block of input.</p>
</dd>
<dt><strong><a name="evp_md_flag_xof" class="item">EVP_MD_FLAG_XOF</a></strong></dt>
<dd>
<p>This digest method is an extensible-output function (XOF) and supports
the <strong>EVP_MD_CTRL_XOF_LEN</strong> control.</p>
</dd>
<dt><strong><a name="evp_md_flag_digalgid_null" class="item">EVP_MD_FLAG_DIGALGID_NULL</a></strong></dt>
<dd>
<p>When setting up a DigestAlgorithmIdentifier, this flag will have the
parameter set to NULL by default. Use this for PKCS#1. <em>Note: if
combined with EVP_MD_FLAG_DIGALGID_ABSENT, the latter will override.</em></p>
</dd>
<dt><strong><a name="evp_md_flag_digalgid_absent" class="item">EVP_MD_FLAG_DIGALGID_ABSENT</a></strong></dt>
<dd>
<p>When setting up a DigestAlgorithmIdentifier, this flag will have the
parameter be left absent by default. <em>Note: if combined with
EVP_MD_FLAG_DIGALGID_NULL, the latter will be overridden.</em></p>
</dd>
<dt><strong><a name="evp_md_flag_digalgid_custom" class="item">EVP_MD_FLAG_DIGALGID_CUSTOM</a></strong></dt>
<dd>
<p>Custom DigestAlgorithmIdentifier handling via ctrl, with
<strong>EVP_MD_FLAG_DIGALGID_ABSENT</strong> as default. <em>Note: if combined with
EVP_MD_FLAG_DIGALGID_NULL, the latter will be overridden.</em>
Currently unused.</p>
</dd>
<dt><strong><a name="evp_md_flag_fips" class="item">EVP_MD_FLAG_FIPS</a></strong></dt>
<dd>
<p>This digest method is suitable for use in FIPS mode.
Currently unused.</p>
</dd>
</dl>
<p><code>EVP_MD_meth_set_init()</code> sets the digest init function for <strong>md</strong>.
The digest init function is called by <code>EVP_Digest()</code>, <code>EVP_DigestInit()</code>,
<code>EVP_DigestInit_ex()</code>, EVP_SignInit, <code>EVP_SignInit_ex()</code>, <code>EVP_VerifyInit()</code>
and <code>EVP_VerifyInit_ex()</code>.</p>
<p><code>EVP_MD_meth_set_update()</code> sets the digest update function for <strong>md</strong>.
The digest update function is called by <code>EVP_Digest()</code>, <code>EVP_DigestUpdate()</code> and
<code>EVP_SignUpdate()</code>.</p>
<p><code>EVP_MD_meth_set_final()</code> sets the digest final function for <strong>md</strong>.
The digest final function is called by <code>EVP_Digest()</code>, <code>EVP_DigestFinal()</code>,
<code>EVP_DigestFinal_ex()</code>, <code>EVP_SignFinal()</code> and <code>EVP_VerifyFinal()</code>.</p>
<p><code>EVP_MD_meth_set_copy()</code> sets the function for <strong>md</strong> to do extra
computations after the method's private data structure has been copied
from one <strong>EVP_MD_CTX</strong> to another. If all that's needed is to copy
the data, there is no need for this copy function.
Note that the copy function is passed two <strong>EVP_MD_CTX *</strong>, the private
data structure is then available with <code>EVP_MD_CTX_md_data()</code>.
This copy function is called by <code>EVP_MD_CTX_copy()</code> and
<code>EVP_MD_CTX_copy_ex()</code>.</p>
<p><code>EVP_MD_meth_set_cleanup()</code> sets the function for <strong>md</strong> to do extra
cleanup before the method's private data structure is cleaned out and
freed.
Note that the cleanup function is passed a <strong>EVP_MD_CTX *</strong>, the
private data structure is then available with <code>EVP_MD_CTX_md_data()</code>.
This cleanup function is called by <code>EVP_MD_CTX_reset()</code> and
<code>EVP_MD_CTX_free()</code>.</p>
<p><code>EVP_MD_meth_set_ctrl()</code> sets the control function for <strong>md</strong>.
See <em>EVP_MD_CTX_ctrl(3)</em> for the available controls.</p>
<p><code>EVP_MD_meth_get_input_blocksize()</code>, <code>EVP_MD_meth_get_result_size()</code>,
<code>EVP_MD_meth_get_app_datasize()</code>, <code>EVP_MD_meth_get_flags()</code>,
<code>EVP_MD_meth_get_init()</code>, <code>EVP_MD_meth_get_update()</code>,
<code>EVP_MD_meth_get_final()</code>, <code>EVP_MD_meth_get_copy()</code>,
<code>EVP_MD_meth_get_cleanup()</code> and <code>EVP_MD_meth_get_ctrl()</code> are all used
to retrieve the method data given with the EVP_MD_meth_set_*()
functions above.</p>
<p>
</p>
<hr />
<h1><a name="return_values">RETURN VALUES</a></h1>
<p><code>EVP_MD_meth_new()</code> and <code>EVP_MD_meth_dup()</code> return a pointer to a newly
created <strong>EVP_MD</strong>, or NULL on failure.
All EVP_MD_meth_set_*() functions return 1.
<code>EVP_MD_get_input_blocksize()</code>, <code>EVP_MD_meth_get_result_size()</code>,
<code>EVP_MD_meth_get_app_datasize()</code> and <code>EVP_MD_meth_get_flags()</code> return the
indicated sizes or flags.
All other EVP_CIPHER_meth_get_*() functions return pointers to their
respective <strong>md</strong> function.</p>
<p>
</p>
<hr />
<h1><a name="see_also">SEE ALSO</a></h1>
<p><em>EVP_DigestInit(3)</em>, <em>EVP_SignInit(3)</em>, <em>EVP_VerifyInit(3)</em></p>
<p>
</p>
<hr />
<h1><a name="history">HISTORY</a></h1>
<p>The <strong>EVP_MD</strong> structure was openly available in OpenSSL before version
1.1. The functions described here were added in OpenSSL 1.1.</p>
<p>
</p>
<hr />
<h1><a name="copyright">COPYRIGHT</a></h1>
<p>Copyright 2015-2018 The OpenSSL Project Authors. All Rights Reserved.</p>
<p>Licensed under the OpenSSL license (the "License"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file LICENSE in the source distribution or at
<a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p>
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