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<title>Returns the public key of a CSR</title>
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<h1 class="refname">openssl_csr_get_public_key</h1>
<p class="verinfo">(PHP 5 >= 5.2.0, PHP 7)</p><p class="refpurpose"><span class="refname">openssl_csr_get_public_key</span> — <span class="dc-title">Returns the public key of a CSR</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.openssl-csr-get-public-key-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">resource</span> <span class="methodname"><strong>openssl_csr_get_public_key</strong></span>
( <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$csr</code></span>
[, <span class="methodparam"><span class="type">bool</span> <code class="parameter">$use_shortnames</code><span class="initializer"> = <strong><code>TRUE</code></strong></span></span>
] )</div>
<p class="para rdfs-comment">
<span class="function"><strong>openssl_csr_get_public_key()</strong></span> extracts the public key
from <code class="parameter">csr</code> and prepares it for use by other functions.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-function.openssl-csr-get-public-key-parameters">
<h3 class="title">Parameters</h3>
<p class="para">
<dl>
<dt>
<code class="parameter">csr</code></dt>
<dd>
<p class="para">
See <a href="openssl.certparams.html" class="link">CSR parameters</a> for a list of valid values.
</p>
</dd>
<dt>
<code class="parameter">use_shortnames</code></dt>
<dd>
<div class="warning"><strong class="warning">Warning</strong>
<p class="para">
This parameter is ignored
</p>
</div>
</dd>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.openssl-csr-get-public-key-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Returns a positive key resource identifier on success, or FALSE on error.
</p>
</div>
<div class="refsect1 examples" id="refsect1-function.openssl-csr-get-public-key-examples">
<h3 class="title">Examples</h3>
<p class="para">
<div class="example" id="example-958">
<p><strong>Example #1 openssl_csr_get_public_key() example</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br />$subject </span><span style="color: #007700">= array(<br /> </span><span style="color: #DD0000">"commonName" </span><span style="color: #007700">=> </span><span style="color: #DD0000">"example.com"</span><span style="color: #007700">,<br />);<br /></span><span style="color: #0000BB">$private_key </span><span style="color: #007700">= </span><span style="color: #0000BB">openssl_pkey_new</span><span style="color: #007700">(array(<br /> </span><span style="color: #DD0000">"private_key_bits" </span><span style="color: #007700">=> </span><span style="color: #0000BB">2048</span><span style="color: #007700">,<br /> </span><span style="color: #DD0000">"private_key_type" </span><span style="color: #007700">=> </span><span style="color: #0000BB">OPENSSL_KEYTYPE_RSA</span><span style="color: #007700">,<br />));<br /></span><span style="color: #0000BB">$csr </span><span style="color: #007700">= </span><span style="color: #0000BB">openssl_csr_new</span><span style="color: #007700">(</span><span style="color: #0000BB">$subject</span><span style="color: #007700">, </span><span style="color: #0000BB">$private_key</span><span style="color: #007700">, array(</span><span style="color: #DD0000">'digest_alg' </span><span style="color: #007700">=> </span><span style="color: #DD0000">'sha256'</span><span style="color: #007700">) );<br /></span><span style="color: #0000BB">$public_key </span><span style="color: #007700">= </span><span style="color: #0000BB">openssl_csr_get_public_key</span><span style="color: #007700">(</span><span style="color: #0000BB">$csr</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$info </span><span style="color: #007700">= </span><span style="color: #0000BB">openssl_pkey_get_details</span><span style="color: #007700">(</span><span style="color: #0000BB">$public_key</span><span style="color: #007700">);<br />echo </span><span style="color: #0000BB">$info</span><span style="color: #007700">[</span><span style="color: #DD0000">'key'</span><span style="color: #007700">];<br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
</div>
</div>
</p>
</div>
<div class="refsect1 seealso" id="refsect1-function.openssl-csr-get-public-key-seealso">
<h3 class="title">See Also</h3>
<p class="para">
<ul class="simplelist">
<li class="member"><span class="function"><a href="function.openssl-csr-get-subject.html" class="function" rel="rdfs-seeAlso">openssl_csr_get_subject()</a> - Returns the subject of a CSR</span></li>
<li class="member"><span class="function"><a href="function.openssl-csr-new.html" class="function" rel="rdfs-seeAlso">openssl_csr_new()</a> - Generates a CSR</span></li>
<li class="member"><span class="function"><a href="function.openssl-pkey-get-details.html" class="function" rel="rdfs-seeAlso">openssl_pkey_get_details()</a> - Returns an array with the key details</span></li>
<li class="member"><span class="function"><a href="function.openssl-pkey-export-to-file.html" class="function" rel="rdfs-seeAlso">openssl_pkey_export_to_file()</a> - Gets an exportable representation of a key into a file</span></li>
<li class="member"><span class="function"><a href="function.openssl-pkey-export.html" class="function" rel="rdfs-seeAlso">openssl_pkey_export()</a> - Gets an exportable representation of a key into a string</span></li>
</ul>
</p>
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