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 </pre><pre class="rust"><code><span class="doccomment">//! Add extensions to an `X509` certificate or certificate request.
 //!
 //! The extensions defined for X.509 v3 certificates provide methods for
 //! associating additional attributes with users or public keys and for
 //! managing relationships between CAs. The extensions created using this
 //! module can be used with `X509v3Context` objects.
 //!
 //! # Example
 //!
 //! ```rust
 //! use openssl::x509::extension::BasicConstraints;
 //! use openssl::x509::X509Extension;
 //!
 //! let mut bc = BasicConstraints::new();
 //! let bc = bc.critical().ca().pathlen(1);
 //!
 //! let extension: X509Extension = bc.build().unwrap();
 //! ```
 </span><span class="kw">use </span>std::fmt::Write;

 <span class="kw">use </span><span class="kw">crate</span>::asn1::Asn1Object;
 <span class="kw">use </span><span class="kw">crate</span>::error::ErrorStack;
 <span class="kw">use </span><span class="kw">crate</span>::nid::Nid;
 <span class="kw">use </span><span class="kw">crate</span>::x509::{GeneralName, Stack, X509Extension, X509v3Context};
 <span class="kw">use </span>foreign_types::ForeignType;

 <span class="doccomment">/// An extension which indicates whether a certificate is a CA certificate.
 </span><span class="kw">pub struct </span>BasicConstraints {
     critical: bool,
     ca: bool,
     pathlen: <span class="prelude-ty">Option</span>&lt;u32&gt;,
 }

 <span class="kw">impl </span>Default <span class="kw">for </span>BasicConstraints {
     <span class="kw">fn </span>default() -&gt; BasicConstraints {
         BasicConstraints::new()
     }
 }

 <span class="kw">impl </span>BasicConstraints {
     <span class="doccomment">/// Construct a new `BasicConstraints` extension.
     </span><span class="kw">pub fn </span>new() -&gt; BasicConstraints {
         BasicConstraints {
             critical: <span class="bool-val">false</span>,
             ca: <span class="bool-val">false</span>,
             pathlen: <span class="prelude-val">None</span>,
         }
     }

     <span class="doccomment">/// Sets the `critical` flag to `true`. The extension will be critical.
     </span><span class="kw">pub fn </span>critical(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>BasicConstraints {
         <span class="self">self</span>.critical = <span class="bool-val">true</span>;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Sets the `ca` flag to `true`.
     </span><span class="kw">pub fn </span>ca(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>BasicConstraints {
         <span class="self">self</span>.ca = <span class="bool-val">true</span>;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Sets the `pathlen` to an optional non-negative value. The `pathlen` is the
     /// maximum number of CAs that can appear below this one in a chain.
     </span><span class="kw">pub fn </span>pathlen(<span class="kw-2">&amp;mut </span><span class="self">self</span>, pathlen: u32) -&gt; <span class="kw-2">&amp;mut </span>BasicConstraints {
         <span class="self">self</span>.pathlen = <span class="prelude-val">Some</span>(pathlen);
         <span class="self">self
     </span>}

     <span class="doccomment">/// Return the `BasicConstraints` extension as an `X509Extension`.
     </span><span class="comment">// Temporarily silence the deprecation warning - this should be ported to
     // `X509Extension::new_internal`.
     </span><span class="attribute">#[allow(deprecated)]
     </span><span class="kw">pub fn </span>build(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;X509Extension, ErrorStack&gt; {
         <span class="kw">let </span><span class="kw-2">mut </span>value = String::new();
         <span class="kw">if </span><span class="self">self</span>.critical {
             value.push_str(<span class="string">&quot;critical,&quot;</span>);
         }
         value.push_str(<span class="string">&quot;CA:&quot;</span>);
         <span class="kw">if </span><span class="self">self</span>.ca {
             value.push_str(<span class="string">&quot;TRUE&quot;</span>);
         } <span class="kw">else </span>{
             value.push_str(<span class="string">&quot;FALSE&quot;</span>);
         }
         <span class="kw">if let </span><span class="prelude-val">Some</span>(pathlen) = <span class="self">self</span>.pathlen {
             <span class="macro">write!</span>(value, <span class="string">&quot;,pathlen:{}&quot;</span>, pathlen).unwrap();
         }
         X509Extension::new_nid(<span class="prelude-val">None</span>, <span class="prelude-val">None</span>, Nid::BASIC_CONSTRAINTS, <span class="kw-2">&amp;</span>value)
     }
 }

 <span class="doccomment">/// An extension consisting of a list of names of the permitted key usages.
 </span><span class="kw">pub struct </span>KeyUsage {
     critical: bool,
     digital_signature: bool,
     non_repudiation: bool,
     key_encipherment: bool,
     data_encipherment: bool,
     key_agreement: bool,
     key_cert_sign: bool,
     crl_sign: bool,
     encipher_only: bool,
     decipher_only: bool,
 }

 <span class="kw">impl </span>Default <span class="kw">for </span>KeyUsage {
     <span class="kw">fn </span>default() -&gt; KeyUsage {
         KeyUsage::new()
     }
 }

 <span class="kw">impl </span>KeyUsage {
     <span class="doccomment">/// Construct a new `KeyUsage` extension.
     </span><span class="kw">pub fn </span>new() -&gt; KeyUsage {
         KeyUsage {
             critical: <span class="bool-val">false</span>,
             digital_signature: <span class="bool-val">false</span>,
             non_repudiation: <span class="bool-val">false</span>,
             key_encipherment: <span class="bool-val">false</span>,
             data_encipherment: <span class="bool-val">false</span>,
             key_agreement: <span class="bool-val">false</span>,
             key_cert_sign: <span class="bool-val">false</span>,
             crl_sign: <span class="bool-val">false</span>,
             encipher_only: <span class="bool-val">false</span>,
             decipher_only: <span class="bool-val">false</span>,
         }
     }

     <span class="doccomment">/// Sets the `critical` flag to `true`. The extension will be critical.
     </span><span class="kw">pub fn </span>critical(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>KeyUsage {
         <span class="self">self</span>.critical = <span class="bool-val">true</span>;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Sets the `digitalSignature` flag to `true`.
     </span><span class="kw">pub fn </span>digital_signature(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>KeyUsage {
         <span class="self">self</span>.digital_signature = <span class="bool-val">true</span>;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Sets the `nonRepudiation` flag to `true`.
     </span><span class="kw">pub fn </span>non_repudiation(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>KeyUsage {
         <span class="self">self</span>.non_repudiation = <span class="bool-val">true</span>;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Sets the `keyEncipherment` flag to `true`.
     </span><span class="kw">pub fn </span>key_encipherment(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>KeyUsage {
         <span class="self">self</span>.key_encipherment = <span class="bool-val">true</span>;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Sets the `dataEncipherment` flag to `true`.
     </span><span class="kw">pub fn </span>data_encipherment(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>KeyUsage {
         <span class="self">self</span>.data_encipherment = <span class="bool-val">true</span>;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Sets the `keyAgreement` flag to `true`.
     </span><span class="kw">pub fn </span>key_agreement(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>KeyUsage {
         <span class="self">self</span>.key_agreement = <span class="bool-val">true</span>;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Sets the `keyCertSign` flag to `true`.
     </span><span class="kw">pub fn </span>key_cert_sign(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>KeyUsage {
         <span class="self">self</span>.key_cert_sign = <span class="bool-val">true</span>;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Sets the `cRLSign` flag to `true`.
     </span><span class="kw">pub fn </span>crl_sign(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>KeyUsage {
         <span class="self">self</span>.crl_sign = <span class="bool-val">true</span>;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Sets the `encipherOnly` flag to `true`.
     </span><span class="kw">pub fn </span>encipher_only(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>KeyUsage {
         <span class="self">self</span>.encipher_only = <span class="bool-val">true</span>;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Sets the `decipherOnly` flag to `true`.
     </span><span class="kw">pub fn </span>decipher_only(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>KeyUsage {
         <span class="self">self</span>.decipher_only = <span class="bool-val">true</span>;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Return the `KeyUsage` extension as an `X509Extension`.
     </span><span class="comment">// Temporarily silence the deprecation warning - this should be ported to
     // `X509Extension::new_internal`.
     </span><span class="attribute">#[allow(deprecated)]
     </span><span class="kw">pub fn </span>build(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;X509Extension, ErrorStack&gt; {
         <span class="kw">let </span><span class="kw-2">mut </span>value = String::new();
         <span class="kw">let </span><span class="kw-2">mut </span>first = <span class="bool-val">true</span>;
         append(<span class="kw-2">&amp;mut </span>value, <span class="kw-2">&amp;mut </span>first, <span class="self">self</span>.critical, <span class="string">&quot;critical&quot;</span>);
         append(
             <span class="kw-2">&amp;mut </span>value,
             <span class="kw-2">&amp;mut </span>first,
             <span class="self">self</span>.digital_signature,
             <span class="string">&quot;digitalSignature&quot;</span>,
         );
         append(
             <span class="kw-2">&amp;mut </span>value,
             <span class="kw-2">&amp;mut </span>first,
             <span class="self">self</span>.non_repudiation,
             <span class="string">&quot;nonRepudiation&quot;</span>,
         );
         append(
             <span class="kw-2">&amp;mut </span>value,
             <span class="kw-2">&amp;mut </span>first,
             <span class="self">self</span>.key_encipherment,
             <span class="string">&quot;keyEncipherment&quot;</span>,
         );
         append(
             <span class="kw-2">&amp;mut </span>value,
             <span class="kw-2">&amp;mut </span>first,
             <span class="self">self</span>.data_encipherment,
             <span class="string">&quot;dataEncipherment&quot;</span>,
         );
         append(<span class="kw-2">&amp;mut </span>value, <span class="kw-2">&amp;mut </span>first, <span class="self">self</span>.key_agreement, <span class="string">&quot;keyAgreement&quot;</span>);
         append(<span class="kw-2">&amp;mut </span>value, <span class="kw-2">&amp;mut </span>first, <span class="self">self</span>.key_cert_sign, <span class="string">&quot;keyCertSign&quot;</span>);
         append(<span class="kw-2">&amp;mut </span>value, <span class="kw-2">&amp;mut </span>first, <span class="self">self</span>.crl_sign, <span class="string">&quot;cRLSign&quot;</span>);
         append(<span class="kw-2">&amp;mut </span>value, <span class="kw-2">&amp;mut </span>first, <span class="self">self</span>.encipher_only, <span class="string">&quot;encipherOnly&quot;</span>);
         append(<span class="kw-2">&amp;mut </span>value, <span class="kw-2">&amp;mut </span>first, <span class="self">self</span>.decipher_only, <span class="string">&quot;decipherOnly&quot;</span>);
         X509Extension::new_nid(<span class="prelude-val">None</span>, <span class="prelude-val">None</span>, Nid::KEY_USAGE, <span class="kw-2">&amp;</span>value)
     }
 }

 <span class="doccomment">/// An extension consisting of a list of usages indicating purposes
 /// for which the certificate public key can be used for.
 </span><span class="kw">pub struct </span>ExtendedKeyUsage {
     critical: bool,
     items: Vec&lt;String&gt;,
 }

 <span class="kw">impl </span>Default <span class="kw">for </span>ExtendedKeyUsage {
     <span class="kw">fn </span>default() -&gt; ExtendedKeyUsage {
         ExtendedKeyUsage::new()
     }
 }

 <span class="kw">impl </span>ExtendedKeyUsage {
     <span class="doccomment">/// Construct a new `ExtendedKeyUsage` extension.
     </span><span class="kw">pub fn </span>new() -&gt; ExtendedKeyUsage {
         ExtendedKeyUsage {
             critical: <span class="bool-val">false</span>,
             items: <span class="macro">vec!</span>[],
         }
     }

     <span class="doccomment">/// Sets the `critical` flag to `true`. The extension will be critical.
     </span><span class="kw">pub fn </span>critical(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>ExtendedKeyUsage {
         <span class="self">self</span>.critical = <span class="bool-val">true</span>;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Sets the `serverAuth` flag to `true`.
     </span><span class="kw">pub fn </span>server_auth(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>ExtendedKeyUsage {
         <span class="self">self</span>.other(<span class="string">&quot;serverAuth&quot;</span>)
     }

     <span class="doccomment">/// Sets the `clientAuth` flag to `true`.
     </span><span class="kw">pub fn </span>client_auth(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>ExtendedKeyUsage {
         <span class="self">self</span>.other(<span class="string">&quot;clientAuth&quot;</span>)
     }

     <span class="doccomment">/// Sets the `codeSigning` flag to `true`.
     </span><span class="kw">pub fn </span>code_signing(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>ExtendedKeyUsage {
         <span class="self">self</span>.other(<span class="string">&quot;codeSigning&quot;</span>)
     }

     <span class="doccomment">/// Sets the `emailProtection` flag to `true`.
     </span><span class="kw">pub fn </span>email_protection(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>ExtendedKeyUsage {
         <span class="self">self</span>.other(<span class="string">&quot;emailProtection&quot;</span>)
     }

     <span class="doccomment">/// Sets the `timeStamping` flag to `true`.
     </span><span class="kw">pub fn </span>time_stamping(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>ExtendedKeyUsage {
         <span class="self">self</span>.other(<span class="string">&quot;timeStamping&quot;</span>)
     }

     <span class="doccomment">/// Sets the `msCodeInd` flag to `true`.
     </span><span class="kw">pub fn </span>ms_code_ind(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>ExtendedKeyUsage {
         <span class="self">self</span>.other(<span class="string">&quot;msCodeInd&quot;</span>)
     }

     <span class="doccomment">/// Sets the `msCodeCom` flag to `true`.
     </span><span class="kw">pub fn </span>ms_code_com(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>ExtendedKeyUsage {
         <span class="self">self</span>.other(<span class="string">&quot;msCodeCom&quot;</span>)
     }

     <span class="doccomment">/// Sets the `msCTLSign` flag to `true`.
     </span><span class="kw">pub fn </span>ms_ctl_sign(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>ExtendedKeyUsage {
         <span class="self">self</span>.other(<span class="string">&quot;msCTLSign&quot;</span>)
     }

     <span class="doccomment">/// Sets the `msSGC` flag to `true`.
     </span><span class="kw">pub fn </span>ms_sgc(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>ExtendedKeyUsage {
         <span class="self">self</span>.other(<span class="string">&quot;msSGC&quot;</span>)
     }

     <span class="doccomment">/// Sets the `msEFS` flag to `true`.
     </span><span class="kw">pub fn </span>ms_efs(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>ExtendedKeyUsage {
         <span class="self">self</span>.other(<span class="string">&quot;msEFS&quot;</span>)
     }

     <span class="doccomment">/// Sets the `nsSGC` flag to `true`.
     </span><span class="kw">pub fn </span>ns_sgc(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>ExtendedKeyUsage {
         <span class="self">self</span>.other(<span class="string">&quot;nsSGC&quot;</span>)
     }

     <span class="doccomment">/// Sets a flag not already defined.
     </span><span class="kw">pub fn </span>other(<span class="kw-2">&amp;mut </span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>str) -&gt; <span class="kw-2">&amp;mut </span>ExtendedKeyUsage {
         <span class="self">self</span>.items.push(other.to_string());
         <span class="self">self
     </span>}

     <span class="doccomment">/// Return the `ExtendedKeyUsage` extension as an `X509Extension`.
     </span><span class="kw">pub fn </span>build(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;X509Extension, ErrorStack&gt; {
         <span class="kw">let </span><span class="kw-2">mut </span>stack = Stack::new()<span class="question-mark">?</span>;
         <span class="kw">for </span>item <span class="kw">in </span><span class="kw-2">&amp;</span><span class="self">self</span>.items {
             stack.push(Asn1Object::from_str(item)<span class="question-mark">?</span>)<span class="question-mark">?</span>;
         }
         <span class="kw">unsafe </span>{
             X509Extension::new_internal(Nid::EXT_KEY_USAGE, <span class="self">self</span>.critical, stack.as_ptr().cast())
         }
     }
 }

 <span class="doccomment">/// An extension that provides a means of identifying certificates that contain a
 /// particular public key.
 </span><span class="kw">pub struct </span>SubjectKeyIdentifier {
     critical: bool,
 }

 <span class="kw">impl </span>Default <span class="kw">for </span>SubjectKeyIdentifier {
     <span class="kw">fn </span>default() -&gt; SubjectKeyIdentifier {
         SubjectKeyIdentifier::new()
     }
 }

 <span class="kw">impl </span>SubjectKeyIdentifier {
     <span class="doccomment">/// Construct a new `SubjectKeyIdentifier` extension.
     </span><span class="kw">pub fn </span>new() -&gt; SubjectKeyIdentifier {
         SubjectKeyIdentifier { critical: <span class="bool-val">false </span>}
     }

     <span class="doccomment">/// Sets the `critical` flag to `true`. The extension will be critical.
     </span><span class="kw">pub fn </span>critical(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>SubjectKeyIdentifier {
         <span class="self">self</span>.critical = <span class="bool-val">true</span>;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Return a `SubjectKeyIdentifier` extension as an `X509Extension`.
     </span><span class="comment">// Temporarily silence the deprecation warning - this should be ported to
     // `X509Extension::new_internal`.
     </span><span class="attribute">#[allow(deprecated)]
     </span><span class="kw">pub fn </span>build(<span class="kw-2">&amp;</span><span class="self">self</span>, ctx: <span class="kw-2">&amp;</span>X509v3Context&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; <span class="prelude-ty">Result</span>&lt;X509Extension, ErrorStack&gt; {
         <span class="kw">let </span><span class="kw-2">mut </span>value = String::new();
         <span class="kw">let </span><span class="kw-2">mut </span>first = <span class="bool-val">true</span>;
         append(<span class="kw-2">&amp;mut </span>value, <span class="kw-2">&amp;mut </span>first, <span class="self">self</span>.critical, <span class="string">&quot;critical&quot;</span>);
         append(<span class="kw-2">&amp;mut </span>value, <span class="kw-2">&amp;mut </span>first, <span class="bool-val">true</span>, <span class="string">&quot;hash&quot;</span>);
         X509Extension::new_nid(<span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(ctx), Nid::SUBJECT_KEY_IDENTIFIER, <span class="kw-2">&amp;</span>value)
     }
 }

 <span class="doccomment">/// An extension that provides a means of identifying the public key corresponding
 /// to the private key used to sign a CRL.
 </span><span class="kw">pub struct </span>AuthorityKeyIdentifier {
     critical: bool,
     keyid: <span class="prelude-ty">Option</span>&lt;bool&gt;,
     issuer: <span class="prelude-ty">Option</span>&lt;bool&gt;,
 }

 <span class="kw">impl </span>Default <span class="kw">for </span>AuthorityKeyIdentifier {
     <span class="kw">fn </span>default() -&gt; AuthorityKeyIdentifier {
         AuthorityKeyIdentifier::new()
     }
 }

 <span class="kw">impl </span>AuthorityKeyIdentifier {
     <span class="doccomment">/// Construct a new `AuthorityKeyIdentifier` extension.
     </span><span class="kw">pub fn </span>new() -&gt; AuthorityKeyIdentifier {
         AuthorityKeyIdentifier {
             critical: <span class="bool-val">false</span>,
             keyid: <span class="prelude-val">None</span>,
             issuer: <span class="prelude-val">None</span>,
         }
     }

     <span class="doccomment">/// Sets the `critical` flag to `true`. The extension will be critical.
     </span><span class="kw">pub fn </span>critical(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>AuthorityKeyIdentifier {
         <span class="self">self</span>.critical = <span class="bool-val">true</span>;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Sets the `keyid` flag.
     </span><span class="kw">pub fn </span>keyid(<span class="kw-2">&amp;mut </span><span class="self">self</span>, always: bool) -&gt; <span class="kw-2">&amp;mut </span>AuthorityKeyIdentifier {
         <span class="self">self</span>.keyid = <span class="prelude-val">Some</span>(always);
         <span class="self">self
     </span>}

     <span class="doccomment">/// Sets the `issuer` flag.
     </span><span class="kw">pub fn </span>issuer(<span class="kw-2">&amp;mut </span><span class="self">self</span>, always: bool) -&gt; <span class="kw-2">&amp;mut </span>AuthorityKeyIdentifier {
         <span class="self">self</span>.issuer = <span class="prelude-val">Some</span>(always);
         <span class="self">self
     </span>}

     <span class="doccomment">/// Return a `AuthorityKeyIdentifier` extension as an `X509Extension`.
     </span><span class="comment">// Temporarily silence the deprecation warning - this should be ported to
     // `X509Extension::new_internal`.
     </span><span class="attribute">#[allow(deprecated)]
     </span><span class="kw">pub fn </span>build(<span class="kw-2">&amp;</span><span class="self">self</span>, ctx: <span class="kw-2">&amp;</span>X509v3Context&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; <span class="prelude-ty">Result</span>&lt;X509Extension, ErrorStack&gt; {
         <span class="kw">let </span><span class="kw-2">mut </span>value = String::new();
         <span class="kw">let </span><span class="kw-2">mut </span>first = <span class="bool-val">true</span>;
         append(<span class="kw-2">&amp;mut </span>value, <span class="kw-2">&amp;mut </span>first, <span class="self">self</span>.critical, <span class="string">&quot;critical&quot;</span>);
         <span class="kw">match </span><span class="self">self</span>.keyid {
             <span class="prelude-val">Some</span>(<span class="bool-val">true</span>) =&gt; append(<span class="kw-2">&amp;mut </span>value, <span class="kw-2">&amp;mut </span>first, <span class="bool-val">true</span>, <span class="string">&quot;keyid:always&quot;</span>),
             <span class="prelude-val">Some</span>(<span class="bool-val">false</span>) =&gt; append(<span class="kw-2">&amp;mut </span>value, <span class="kw-2">&amp;mut </span>first, <span class="bool-val">true</span>, <span class="string">&quot;keyid&quot;</span>),
             <span class="prelude-val">None </span>=&gt; {}
         }
         <span class="kw">match </span><span class="self">self</span>.issuer {
             <span class="prelude-val">Some</span>(<span class="bool-val">true</span>) =&gt; append(<span class="kw-2">&amp;mut </span>value, <span class="kw-2">&amp;mut </span>first, <span class="bool-val">true</span>, <span class="string">&quot;issuer:always&quot;</span>),
             <span class="prelude-val">Some</span>(<span class="bool-val">false</span>) =&gt; append(<span class="kw-2">&amp;mut </span>value, <span class="kw-2">&amp;mut </span>first, <span class="bool-val">true</span>, <span class="string">&quot;issuer&quot;</span>),
             <span class="prelude-val">None </span>=&gt; {}
         }
         X509Extension::new_nid(<span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(ctx), Nid::AUTHORITY_KEY_IDENTIFIER, <span class="kw-2">&amp;</span>value)
     }
 }

 <span class="kw">enum </span>RustGeneralName {
     Dns(String),
     Email(String),
     Uri(String),
     Ip(String),
     Rid(String),
     OtherName(Asn1Object, Vec&lt;u8&gt;),
 }

 <span class="doccomment">/// An extension that allows additional identities to be bound to the subject
 /// of the certificate.
 </span><span class="kw">pub struct </span>SubjectAlternativeName {
     critical: bool,
     items: Vec&lt;RustGeneralName&gt;,
 }

 <span class="kw">impl </span>Default <span class="kw">for </span>SubjectAlternativeName {
     <span class="kw">fn </span>default() -&gt; SubjectAlternativeName {
         SubjectAlternativeName::new()
     }
 }

 <span class="kw">impl </span>SubjectAlternativeName {
     <span class="doccomment">/// Construct a new `SubjectAlternativeName` extension.
     </span><span class="kw">pub fn </span>new() -&gt; SubjectAlternativeName {
         SubjectAlternativeName {
             critical: <span class="bool-val">false</span>,
             items: <span class="macro">vec!</span>[],
         }
     }

     <span class="doccomment">/// Sets the `critical` flag to `true`. The extension will be critical.
     </span><span class="kw">pub fn </span>critical(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>SubjectAlternativeName {
         <span class="self">self</span>.critical = <span class="bool-val">true</span>;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Sets the `email` flag.
     </span><span class="kw">pub fn </span>email(<span class="kw-2">&amp;mut </span><span class="self">self</span>, email: <span class="kw-2">&amp;</span>str) -&gt; <span class="kw-2">&amp;mut </span>SubjectAlternativeName {
         <span class="self">self</span>.items.push(RustGeneralName::Email(email.to_string()));
         <span class="self">self
     </span>}

     <span class="doccomment">/// Sets the `uri` flag.
     </span><span class="kw">pub fn </span>uri(<span class="kw-2">&amp;mut </span><span class="self">self</span>, uri: <span class="kw-2">&amp;</span>str) -&gt; <span class="kw-2">&amp;mut </span>SubjectAlternativeName {
         <span class="self">self</span>.items.push(RustGeneralName::Uri(uri.to_string()));
         <span class="self">self
     </span>}

     <span class="doccomment">/// Sets the `dns` flag.
     </span><span class="kw">pub fn </span>dns(<span class="kw-2">&amp;mut </span><span class="self">self</span>, dns: <span class="kw-2">&amp;</span>str) -&gt; <span class="kw-2">&amp;mut </span>SubjectAlternativeName {
         <span class="self">self</span>.items.push(RustGeneralName::Dns(dns.to_string()));
         <span class="self">self
     </span>}

     <span class="doccomment">/// Sets the `rid` flag.
     </span><span class="kw">pub fn </span>rid(<span class="kw-2">&amp;mut </span><span class="self">self</span>, rid: <span class="kw-2">&amp;</span>str) -&gt; <span class="kw-2">&amp;mut </span>SubjectAlternativeName {
         <span class="self">self</span>.items.push(RustGeneralName::Rid(rid.to_string()));
         <span class="self">self
     </span>}

     <span class="doccomment">/// Sets the `ip` flag.
     </span><span class="kw">pub fn </span>ip(<span class="kw-2">&amp;mut </span><span class="self">self</span>, ip: <span class="kw-2">&amp;</span>str) -&gt; <span class="kw-2">&amp;mut </span>SubjectAlternativeName {
         <span class="self">self</span>.items.push(RustGeneralName::Ip(ip.to_string()));
         <span class="self">self
     </span>}

     <span class="doccomment">/// Sets the `dirName` flag.
     ///
     /// Not currently actually supported, always panics.
     </span><span class="attribute">#[deprecated = <span class="string">&quot;dir_name is deprecated and always panics. Please file a bug if you have a use case for this.&quot;</span>]
     </span><span class="kw">pub fn </span>dir_name(<span class="kw-2">&amp;mut </span><span class="self">self</span>, _dir_name: <span class="kw-2">&amp;</span>str) -&gt; <span class="kw-2">&amp;mut </span>SubjectAlternativeName {
         <span class="macro">unimplemented!</span>(
             <span class="string">&quot;This has not yet been adapted for the new internals. File a bug if you need this.&quot;
         </span>);
     }

     <span class="doccomment">/// Sets the `otherName` flag.
     ///
     /// Not currently actually supported, always panics. Please use other_name2
     </span><span class="attribute">#[deprecated = <span class="string">&quot;other_name is deprecated and always panics. Please use other_name2.&quot;</span>]
     </span><span class="kw">pub fn </span>other_name(<span class="kw-2">&amp;mut </span><span class="self">self</span>, _other_name: <span class="kw-2">&amp;</span>str) -&gt; <span class="kw-2">&amp;mut </span>SubjectAlternativeName {
         <span class="macro">unimplemented!</span>(<span class="string">&quot;This has not yet been adapted for the new internals. Use other_name2.&quot;</span>);
     }

     <span class="doccomment">/// Sets the `otherName` flag.
     ///
     /// `content` must be a valid der encoded ASN1_TYPE
     ///
     /// If you want to add just a ia5string use `other_name_ia5string`
     </span><span class="kw">pub fn </span>other_name2(<span class="kw-2">&amp;mut </span><span class="self">self</span>, oid: Asn1Object, content: <span class="kw-2">&amp;</span>[u8]) -&gt; <span class="kw-2">&amp;mut </span>SubjectAlternativeName {
         <span class="self">self</span>.items
             .push(RustGeneralName::OtherName(oid, content.into()));
         <span class="self">self
     </span>}

     <span class="doccomment">/// Return a `SubjectAlternativeName` extension as an `X509Extension`.
     </span><span class="kw">pub fn </span>build(<span class="kw-2">&amp;</span><span class="self">self</span>, _ctx: <span class="kw-2">&amp;</span>X509v3Context&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; <span class="prelude-ty">Result</span>&lt;X509Extension, ErrorStack&gt; {
         <span class="kw">let </span><span class="kw-2">mut </span>stack = Stack::new()<span class="question-mark">?</span>;
         <span class="kw">for </span>item <span class="kw">in </span><span class="kw-2">&amp;</span><span class="self">self</span>.items {
             <span class="kw">let </span>gn = <span class="kw">match </span>item {
                 RustGeneralName::Dns(s) =&gt; GeneralName::new_dns(s.as_bytes())<span class="question-mark">?</span>,
                 RustGeneralName::Email(s) =&gt; GeneralName::new_email(s.as_bytes())<span class="question-mark">?</span>,
                 RustGeneralName::Uri(s) =&gt; GeneralName::new_uri(s.as_bytes())<span class="question-mark">?</span>,
                 RustGeneralName::Ip(s) =&gt; {
                     GeneralName::new_ip(s.parse().map_err(|<span class="kw">_</span>| ErrorStack::get())<span class="question-mark">?</span>)<span class="question-mark">?
                 </span>}
                 RustGeneralName::Rid(s) =&gt; GeneralName::new_rid(Asn1Object::from_str(s)<span class="question-mark">?</span>)<span class="question-mark">?</span>,
                 RustGeneralName::OtherName(oid, content) =&gt; {
                     GeneralName::new_other_name(oid.clone(), content)<span class="question-mark">?
                 </span>}
             };
             stack.push(gn)<span class="question-mark">?</span>;
         }

         <span class="kw">unsafe </span>{
             X509Extension::new_internal(Nid::SUBJECT_ALT_NAME, <span class="self">self</span>.critical, stack.as_ptr().cast())
         }
     }
 }

 <span class="kw">fn </span>append(value: <span class="kw-2">&amp;mut </span>String, first: <span class="kw-2">&amp;mut </span>bool, should: bool, element: <span class="kw-2">&amp;</span>str) {
     <span class="kw">if </span>!should {
         <span class="kw">return</span>;
     }

     <span class="kw">if </span>!<span class="kw-2">*</span>first {
         value.push(<span class="string">&#39;,&#39;</span>);
     }
     <span class="kw-2">*</span>first = <span class="bool-val">false</span>;
     value.push_str(element);
 }
 </code></pre></div>
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