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<title>X509_digest</title>
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<ul id="index">
  <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="#COPYRIGHT">COPYRIGHT</a></li>
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<p>X509_digest, X509_CRL_digest, X509_pubkey_digest, X509_NAME_digest, X509_REQ_digest, PKCS7_ISSUER_AND_SERIAL_digest - get digest of various objects</p>

<h1 id="SYNOPSIS">SYNOPSIS</h1>

<pre><code> #include &lt;openssl/x509.h&gt;

int X509_digest(const X509 *data, const EVP_MD *type, unsigned char *md,
                 unsigned int *len);

int X509_CRL_digest(const X509_CRL *data, const EVP_MD *type, unsigned char *md,
                     unsigned int *len);

int X509_pubkey_digest(const X509 *data, const EVP_MD *type,
                        unsigned char *md, unsigned int *len);

int X509_REQ_digest(const X509_REQ *data, const EVP_MD *type,
                     unsigned char *md, unsigned int *len);

int X509_NAME_digest(const X509_NAME *data, const EVP_MD *type,
                      unsigned char *md, unsigned int *len);

#include &lt;openssl/pkcs7.h&gt;

int PKCS7_ISSUER_AND_SERIAL_digest(PKCS7_ISSUER_AND_SERIAL *data,
                                    const EVP_MD *type, unsigned char *md,
                                    unsigned int *len);</code></pre>

<h1 id="DESCRIPTION">DESCRIPTION</h1>

<p>X509_pubkey_digest() returns a digest of the DER representation of the public key in the specified X509 <b>data</b> object. All other functions described here return a digest of the DER representation of their entire <b>data</b> objects.</p>

<p>The <b>type</b> parameter specifies the digest to be used, such as EVP_sha1(). The <b>md</b> is a pointer to the buffer where the digest will be copied and is assumed to be large enough; the constant <b>EVP_MAX_MD_SIZE</b> is suggested. The <b>len</b> parameter, if not NULL, points to a place where the digest size will be stored.</p>

<h1 id="RETURN-VALUES">RETURN VALUES</h1>

<p>All functions described here return 1 for success and 0 for failure.</p>

<h1 id="COPYRIGHT">COPYRIGHT</h1>

<p>Licensed under the OpenSSL license (the &quot;License&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 <a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p>

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