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&lt;title&gt;EVP_PKEY_get_default_digest_nid&lt;/title&gt;
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  &lt;li&gt;&lt;a href=&quot;#NAME&quot;&gt;NAME&lt;/a&gt;&lt;/li&gt;
  &lt;li&gt;&lt;a href=&quot;#SYNOPSIS&quot;&gt;SYNOPSIS&lt;/a&gt;&lt;/li&gt;
  &lt;li&gt;&lt;a href=&quot;#DESCRIPTION&quot;&gt;DESCRIPTION&lt;/a&gt;&lt;/li&gt;
  &lt;li&gt;&lt;a href=&quot;#NOTES&quot;&gt;NOTES&lt;/a&gt;&lt;/li&gt;
  &lt;li&gt;&lt;a href=&quot;#RETURN-VALUES&quot;&gt;RETURN VALUES&lt;/a&gt;&lt;/li&gt;
  &lt;li&gt;&lt;a href=&quot;#SEE-ALSO&quot;&gt;SEE ALSO&lt;/a&gt;&lt;/li&gt;
  &lt;li&gt;&lt;a href=&quot;#HISTORY&quot;&gt;HISTORY&lt;/a&gt;&lt;/li&gt;
  &lt;li&gt;&lt;a href=&quot;#COPYRIGHT&quot;&gt;COPYRIGHT&lt;/a&gt;&lt;/li&gt;
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&lt;h1 id=&quot;NAME&quot;&gt;NAME&lt;/h1&gt;

&lt;p&gt;EVP_PKEY_get_default_digest_nid - get default signature digest&lt;/p&gt;

&lt;h1 id=&quot;SYNOPSIS&quot;&gt;SYNOPSIS&lt;/h1&gt;

&lt;pre&gt;&lt;code&gt; #include &amp;lt;openssl/evp.h&amp;gt;
 int EVP_PKEY_get_default_digest_nid(EVP_PKEY *pkey, int *pnid);&lt;/code&gt;&lt;/pre&gt;

&lt;h1 id=&quot;DESCRIPTION&quot;&gt;DESCRIPTION&lt;/h1&gt;

&lt;p&gt;The EVP_PKEY_get_default_digest_nid() function sets &lt;b&gt;pnid&lt;/b&gt; to the default message digest NID for the public key signature operations associated with key &lt;b&gt;pkey&lt;/b&gt;. Note that some signature algorithms (i.e. Ed25519 and Ed448) do not use a digest during signing. In this case &lt;b&gt;pnid&lt;/b&gt; will be set to NID_undef.&lt;/p&gt;

&lt;h1 id=&quot;NOTES&quot;&gt;NOTES&lt;/h1&gt;

&lt;p&gt;For all current standard OpenSSL public key algorithms SHA1 is returned.&lt;/p&gt;

&lt;h1 id=&quot;RETURN-VALUES&quot;&gt;RETURN VALUES&lt;/h1&gt;

&lt;p&gt;The EVP_PKEY_get_default_digest_nid() function returns 1 if the message digest is advisory (that is other digests can be used) and 2 if it is mandatory (other digests can not be used). It returns 0 or a negative value for failure. In particular a return value of -2 indicates the operation is not supported by the public key algorithm.&lt;/p&gt;

&lt;h1 id=&quot;SEE-ALSO&quot;&gt;SEE ALSO&lt;/h1&gt;

&lt;p&gt;&lt;a href=&quot;../man3/EVP_PKEY_CTX_new.html&quot;&gt;EVP_PKEY_CTX_new(3)&lt;/a&gt;, &lt;a href=&quot;../man3/EVP_PKEY_sign.html&quot;&gt;EVP_PKEY_sign(3)&lt;/a&gt;, &lt;a href=&quot;../man3/EVP_PKEY_verify.html&quot;&gt;EVP_PKEY_verify(3)&lt;/a&gt;, &lt;a href=&quot;../man3/EVP_PKEY_verify_recover.html&quot;&gt;EVP_PKEY_verify_recover(3)&lt;/a&gt;,&lt;/p&gt;

&lt;h1 id=&quot;HISTORY&quot;&gt;HISTORY&lt;/h1&gt;

&lt;p&gt;This function was added in OpenSSL 1.0.0.&lt;/p&gt;

&lt;h1 id=&quot;COPYRIGHT&quot;&gt;COPYRIGHT&lt;/h1&gt;

&lt;p&gt;Copyright 2006-2018 The OpenSSL Project Authors. All Rights Reserved.&lt;/p&gt;

&lt;p&gt;Licensed under the OpenSSL license (the &amp;quot;License&amp;quot;). 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 &lt;a href=&quot;https://www.openssl.org/source/license.html&quot;&gt;https://www.openssl.org/source/license.html&lt;/a&gt;.&lt;/p&gt;


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