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 <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/openssl-0.10.54/src/dh.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>dh.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../openssl/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../openssl/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span>
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 </pre><pre class="rust"><code><span class="doccomment">//! Diffie-Hellman key agreement.

 </span><span class="kw">use </span>cfg_if::cfg_if;
 <span class="kw">use </span>foreign_types::{ForeignType, ForeignTypeRef};
 <span class="kw">use </span>std::mem;
 <span class="kw">use </span>std::ptr;

 <span class="kw">use </span><span class="kw">crate</span>::bn::{BigNum, BigNumRef};
 <span class="kw">use </span><span class="kw">crate</span>::error::ErrorStack;
 <span class="kw">use </span><span class="kw">crate</span>::pkey::{HasParams, HasPrivate, HasPublic, Params, Private, Public};
 <span class="kw">use crate</span>::{cvt, cvt_p};
 <span class="kw">use </span>openssl_macros::corresponds;

 <span class="macro">generic_foreign_type_and_impl_send_sync! </span>{
     <span class="kw">type </span>CType = ffi::DH;
     <span class="kw">fn </span>drop = ffi::DH_free;

     <span class="kw">pub struct </span>Dh&lt;T&gt;;

     <span class="kw">pub struct </span>DhRef&lt;T&gt;;
 }

 <span class="kw">impl</span>&lt;T&gt; DhRef&lt;T&gt;
 <span class="kw">where
     </span>T: HasParams,
 {
     <span class="macro">to_pem! </span>{
         <span class="doccomment">/// Serializes the parameters into a PEM-encoded PKCS#3 DHparameter structure.
         ///
         /// The output will have a header of `-----BEGIN DH PARAMETERS-----`.
         </span><span class="attribute">#[corresponds(PEM_write_bio_DHparams)]
         </span>params_to_pem,
         ffi::PEM_write_bio_DHparams
     }

     <span class="macro">to_der! </span>{
         <span class="doccomment">/// Serializes the parameters into a DER-encoded PKCS#3 DHparameter structure.
         </span><span class="attribute">#[corresponds(i2d_DHparams)]
         </span>params_to_der,
         ffi::i2d_DHparams
     }

     <span class="doccomment">/// Validates DH parameters for correctness
     </span><span class="attribute">#[corresponds(DH_check_key)]
     </span><span class="kw">pub fn </span>check_key(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;bool, ErrorStack&gt; {
         <span class="kw">unsafe </span>{
             <span class="kw">let </span><span class="kw-2">mut </span>codes = <span class="number">0</span>;
             cvt(ffi::DH_check(<span class="self">self</span>.as_ptr(), <span class="kw-2">&amp;mut </span>codes))<span class="question-mark">?</span>;
             <span class="prelude-val">Ok</span>(codes == <span class="number">0</span>)
         }
     }
 }

 <span class="kw">impl </span>Dh&lt;Params&gt; {
     <span class="kw">pub fn </span>from_params(p: BigNum, g: BigNum, q: BigNum) -&gt; <span class="prelude-ty">Result</span>&lt;Dh&lt;Params&gt;, ErrorStack&gt; {
         <span class="self">Self</span>::from_pqg(p, <span class="prelude-val">Some</span>(q), g)
     }

     <span class="doccomment">/// Creates a DH instance based upon the given primes and generator params.
     </span><span class="attribute">#[corresponds(DH_set0_pqg)]
     </span><span class="kw">pub fn </span>from_pqg(
         prime_p: BigNum,
         prime_q: <span class="prelude-ty">Option</span>&lt;BigNum&gt;,
         generator: BigNum,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;Dh&lt;Params&gt;, ErrorStack&gt; {
         <span class="kw">unsafe </span>{
             <span class="kw">let </span>dh = Dh::from_ptr(cvt_p(ffi::DH_new())<span class="question-mark">?</span>);
             cvt(DH_set0_pqg(
                 dh.<span class="number">0</span>,
                 prime_p.as_ptr(),
                 prime_q.as_ref().map_or(ptr::null_mut(), |q| q.as_ptr()),
                 generator.as_ptr(),
             ))<span class="question-mark">?</span>;
             mem::forget((prime_p, prime_q, generator));
             <span class="prelude-val">Ok</span>(dh)
         }
     }

     <span class="doccomment">/// Sets the public key on the DH object.
     </span><span class="kw">pub fn </span>set_public_key(<span class="self">self</span>, pub_key: BigNum) -&gt; <span class="prelude-ty">Result</span>&lt;Dh&lt;Public&gt;, ErrorStack&gt; {
         <span class="kw">unsafe </span>{
             <span class="kw">let </span>dh_ptr = <span class="self">self</span>.<span class="number">0</span>;
             cvt(DH_set0_key(dh_ptr, pub_key.as_ptr(), ptr::null_mut()))<span class="question-mark">?</span>;
             mem::forget((<span class="self">self</span>, pub_key));
             <span class="prelude-val">Ok</span>(Dh::from_ptr(dh_ptr))
         }
     }

     <span class="doccomment">/// Sets the private key on the DH object and recomputes the public key.
     </span><span class="kw">pub fn </span>set_private_key(<span class="self">self</span>, priv_key: BigNum) -&gt; <span class="prelude-ty">Result</span>&lt;Dh&lt;Private&gt;, ErrorStack&gt; {
         <span class="kw">unsafe </span>{
             <span class="kw">let </span>dh_ptr = <span class="self">self</span>.<span class="number">0</span>;
             cvt(DH_set0_key(dh_ptr, ptr::null_mut(), priv_key.as_ptr()))<span class="question-mark">?</span>;
             mem::forget(priv_key);

             cvt(ffi::DH_generate_key(dh_ptr))<span class="question-mark">?</span>;
             mem::forget(<span class="self">self</span>);
             <span class="prelude-val">Ok</span>(Dh::from_ptr(dh_ptr))
         }
     }

     <span class="doccomment">/// Sets the public and private keys on the DH object.
     </span><span class="kw">pub fn </span>set_key(<span class="self">self</span>, pub_key: BigNum, priv_key: BigNum) -&gt; <span class="prelude-ty">Result</span>&lt;Dh&lt;Private&gt;, ErrorStack&gt; {
         <span class="kw">unsafe </span>{
             <span class="kw">let </span>dh_ptr = <span class="self">self</span>.<span class="number">0</span>;
             cvt(DH_set0_key(dh_ptr, pub_key.as_ptr(), priv_key.as_ptr()))<span class="question-mark">?</span>;
             mem::forget((<span class="self">self</span>, pub_key, priv_key));
             <span class="prelude-val">Ok</span>(Dh::from_ptr(dh_ptr))
         }
     }

     <span class="doccomment">/// Generates DH params based on the given `prime_len` and a fixed `generator` value.
     </span><span class="attribute">#[corresponds(DH_generate_parameters_ex)]
     </span><span class="kw">pub fn </span>generate_params(prime_len: u32, generator: u32) -&gt; <span class="prelude-ty">Result</span>&lt;Dh&lt;Params&gt;, ErrorStack&gt; {
         <span class="kw">unsafe </span>{
             <span class="kw">let </span>dh = Dh::from_ptr(cvt_p(ffi::DH_new())<span class="question-mark">?</span>);
             cvt(ffi::DH_generate_parameters_ex(
                 dh.<span class="number">0</span>,
                 prime_len <span class="kw">as </span>i32,
                 generator <span class="kw">as </span>i32,
                 ptr::null_mut(),
             ))<span class="question-mark">?</span>;
             <span class="prelude-val">Ok</span>(dh)
         }
     }

     <span class="doccomment">/// Generates a public and a private key based on the DH params.
     </span><span class="attribute">#[corresponds(DH_generate_key)]
     </span><span class="kw">pub fn </span>generate_key(<span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;Dh&lt;Private&gt;, ErrorStack&gt; {
         <span class="kw">unsafe </span>{
             <span class="kw">let </span>dh_ptr = <span class="self">self</span>.<span class="number">0</span>;
             cvt(ffi::DH_generate_key(dh_ptr))<span class="question-mark">?</span>;
             mem::forget(<span class="self">self</span>);
             <span class="prelude-val">Ok</span>(Dh::from_ptr(dh_ptr))
         }
     }

     <span class="macro">from_pem! </span>{
         <span class="doccomment">/// Deserializes a PEM-encoded PKCS#3 DHpararameters structure.
         ///
         /// The input should have a header of `-----BEGIN DH PARAMETERS-----`.
         </span><span class="attribute">#[corresponds(PEM_read_bio_DHparams)]
         </span>params_from_pem,
         Dh&lt;Params&gt;,
         ffi::PEM_read_bio_DHparams
     }

     <span class="macro">from_der! </span>{
         <span class="doccomment">/// Deserializes a DER-encoded PKCS#3 DHparameters structure.
         </span><span class="attribute">#[corresponds(d2i_DHparams)]
         </span>params_from_der,
         Dh&lt;Params&gt;,
         ffi::d2i_DHparams
     }

     <span class="doccomment">/// Requires OpenSSL 1.0.2 or newer.
     </span><span class="attribute">#[corresponds(DH_get_1024_160)]
     #[cfg(any(ossl102, ossl110))]
     </span><span class="kw">pub fn </span>get_1024_160() -&gt; <span class="prelude-ty">Result</span>&lt;Dh&lt;Params&gt;, ErrorStack&gt; {
         <span class="kw">unsafe </span>{
             ffi::init();
             cvt_p(ffi::DH_get_1024_160()).map(|p| Dh::from_ptr(p))
         }
     }

     <span class="doccomment">/// Requires OpenSSL 1.0.2 or newer.
     </span><span class="attribute">#[corresponds(DH_get_2048_224)]
     #[cfg(any(ossl102, ossl110))]
     </span><span class="kw">pub fn </span>get_2048_224() -&gt; <span class="prelude-ty">Result</span>&lt;Dh&lt;Params&gt;, ErrorStack&gt; {
         <span class="kw">unsafe </span>{
             ffi::init();
             cvt_p(ffi::DH_get_2048_224()).map(|p| Dh::from_ptr(p))
         }
     }

     <span class="doccomment">/// Requires OpenSSL 1.0.2 or newer.
     </span><span class="attribute">#[corresponds(DH_get_2048_256)]
     #[cfg(any(ossl102, ossl110))]
     </span><span class="kw">pub fn </span>get_2048_256() -&gt; <span class="prelude-ty">Result</span>&lt;Dh&lt;Params&gt;, ErrorStack&gt; {
         <span class="kw">unsafe </span>{
             ffi::init();
             cvt_p(ffi::DH_get_2048_256()).map(|p| Dh::from_ptr(p))
         }
     }
 }

 <span class="kw">impl</span>&lt;T&gt; Dh&lt;T&gt;
 <span class="kw">where
     </span>T: HasParams,
 {
     <span class="doccomment">/// Returns the prime `p` from the DH instance.
     </span><span class="attribute">#[corresponds(DH_get0_pqg)]
     </span><span class="kw">pub fn </span>prime_p(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>BigNumRef {
         <span class="kw">let </span><span class="kw-2">mut </span>p = ptr::null();
         <span class="kw">unsafe </span>{
             DH_get0_pqg(<span class="self">self</span>.as_ptr(), <span class="kw-2">&amp;mut </span>p, ptr::null_mut(), ptr::null_mut());
             BigNumRef::from_ptr(p <span class="kw">as </span><span class="kw-2">*mut </span><span class="kw">_</span>)
         }
     }

     <span class="doccomment">/// Returns the prime `q` from the DH instance.
     </span><span class="attribute">#[corresponds(DH_get0_pqg)]
     </span><span class="kw">pub fn </span>prime_q(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>BigNumRef&gt; {
         <span class="kw">let </span><span class="kw-2">mut </span>q = ptr::null();
         <span class="kw">unsafe </span>{
             DH_get0_pqg(<span class="self">self</span>.as_ptr(), ptr::null_mut(), <span class="kw-2">&amp;mut </span>q, ptr::null_mut());
             <span class="kw">if </span>q.is_null() {
                 <span class="prelude-val">None
             </span>} <span class="kw">else </span>{
                 <span class="prelude-val">Some</span>(BigNumRef::from_ptr(q <span class="kw">as </span><span class="kw-2">*mut </span><span class="kw">_</span>))
             }
         }
     }

     <span class="doccomment">/// Returns the generator from the DH instance.
     </span><span class="attribute">#[corresponds(DH_get0_pqg)]
     </span><span class="kw">pub fn </span>generator(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>BigNumRef {
         <span class="kw">let </span><span class="kw-2">mut </span>g = ptr::null();
         <span class="kw">unsafe </span>{
             DH_get0_pqg(<span class="self">self</span>.as_ptr(), ptr::null_mut(), ptr::null_mut(), <span class="kw-2">&amp;mut </span>g);
             BigNumRef::from_ptr(g <span class="kw">as </span><span class="kw-2">*mut </span><span class="kw">_</span>)
         }
     }
 }

 <span class="kw">impl</span>&lt;T&gt; DhRef&lt;T&gt;
 <span class="kw">where
     </span>T: HasPublic,
 {
     <span class="doccomment">/// Returns the public key from the DH instance.
     </span><span class="attribute">#[corresponds(DH_get0_key)]
     </span><span class="kw">pub fn </span>public_key(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>BigNumRef {
         <span class="kw">let </span><span class="kw-2">mut </span>pub_key = ptr::null();
         <span class="kw">unsafe </span>{
             DH_get0_key(<span class="self">self</span>.as_ptr(), <span class="kw-2">&amp;mut </span>pub_key, ptr::null_mut());
             BigNumRef::from_ptr(pub_key <span class="kw">as </span><span class="kw-2">*mut </span><span class="kw">_</span>)
         }
     }
 }

 <span class="kw">impl</span>&lt;T&gt; DhRef&lt;T&gt;
 <span class="kw">where
     </span>T: HasPrivate,
 {
     <span class="doccomment">/// Computes a shared secret from the own private key and the given `public_key`.
     </span><span class="attribute">#[corresponds(DH_compute_key)]
     </span><span class="kw">pub fn </span>compute_key(<span class="kw-2">&amp;</span><span class="self">self</span>, public_key: <span class="kw-2">&amp;</span>BigNumRef) -&gt; <span class="prelude-ty">Result</span>&lt;Vec&lt;u8&gt;, ErrorStack&gt; {
         <span class="kw">unsafe </span>{
             <span class="kw">let </span>key_len = ffi::DH_size(<span class="self">self</span>.as_ptr());
             <span class="kw">let </span><span class="kw-2">mut </span>key = <span class="macro">vec!</span>[<span class="number">0u8</span>; key_len <span class="kw">as </span>usize];
             cvt(ffi::DH_compute_key(
                 key.as_mut_ptr(),
                 public_key.as_ptr(),
                 <span class="self">self</span>.as_ptr(),
             ))<span class="question-mark">?</span>;
             <span class="prelude-val">Ok</span>(key)
         }
     }

     <span class="doccomment">/// Returns the private key from the DH instance.
     </span><span class="attribute">#[corresponds(DH_get0_key)]
     </span><span class="kw">pub fn </span>private_key(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>BigNumRef {
         <span class="kw">let </span><span class="kw-2">mut </span>priv_key = ptr::null();
         <span class="kw">unsafe </span>{
             DH_get0_key(<span class="self">self</span>.as_ptr(), ptr::null_mut(), <span class="kw-2">&amp;mut </span>priv_key);
             BigNumRef::from_ptr(priv_key <span class="kw">as </span><span class="kw-2">*mut </span><span class="kw">_</span>)
         }
     }
 }

 <span class="macro">cfg_if! </span>{
     <span class="kw">if </span><span class="attribute">#[cfg(any(ossl110, libressl270, boringssl))] </span>{
         <span class="kw">use </span>ffi::{DH_set0_pqg, DH_get0_pqg, DH_get0_key, DH_set0_key};
     } <span class="kw">else </span>{
         <span class="attribute">#[allow(bad_style)]
         </span><span class="kw">unsafe fn </span>DH_set0_pqg(
             dh: <span class="kw-2">*mut </span>ffi::DH,
             p: <span class="kw-2">*mut </span>ffi::BIGNUM,
             q: <span class="kw-2">*mut </span>ffi::BIGNUM,
             g: <span class="kw-2">*mut </span>ffi::BIGNUM,
         ) -&gt; ::libc::c_int {
             (<span class="kw-2">*</span>dh).p = p;
             (<span class="kw-2">*</span>dh).q = q;
             (<span class="kw-2">*</span>dh).g = g;
             <span class="number">1
         </span>}

         <span class="attribute">#[allow(bad_style)]
         </span><span class="kw">unsafe fn </span>DH_get0_pqg(
             dh: <span class="kw-2">*mut </span>ffi::DH,
             p: <span class="kw-2">*mut *const </span>ffi::BIGNUM,
             q: <span class="kw-2">*mut *const </span>ffi::BIGNUM,
             g: <span class="kw-2">*mut *const </span>ffi::BIGNUM,
         ) {
             <span class="kw">if </span>!p.is_null() {
                 <span class="kw-2">*</span>p = (<span class="kw-2">*</span>dh).p;
             }
             <span class="kw">if </span>!q.is_null() {
                 <span class="kw-2">*</span>q = (<span class="kw-2">*</span>dh).q;
             }
             <span class="kw">if </span>!g.is_null() {
                 <span class="kw-2">*</span>g = (<span class="kw-2">*</span>dh).g;
             }
         }

         <span class="attribute">#[allow(bad_style)]
         </span><span class="kw">unsafe fn </span>DH_set0_key(
             dh: <span class="kw-2">*mut </span>ffi::DH,
             pub_key: <span class="kw-2">*mut </span>ffi::BIGNUM,
             priv_key: <span class="kw-2">*mut </span>ffi::BIGNUM,
         ) -&gt; ::libc::c_int {
             (<span class="kw-2">*</span>dh).pub_key = pub_key;
             (<span class="kw-2">*</span>dh).priv_key = priv_key;
             <span class="number">1
         </span>}

         <span class="attribute">#[allow(bad_style)]
         </span><span class="kw">unsafe fn </span>DH_get0_key(
             dh: <span class="kw-2">*mut </span>ffi::DH,
             pub_key: <span class="kw-2">*mut *const </span>ffi::BIGNUM,
             priv_key: <span class="kw-2">*mut *const </span>ffi::BIGNUM,
         ) {
             <span class="kw">if </span>!pub_key.is_null() {
                 <span class="kw-2">*</span>pub_key = (<span class="kw-2">*</span>dh).pub_key;
             }
             <span class="kw">if </span>!priv_key.is_null() {
                 <span class="kw-2">*</span>priv_key = (<span class="kw-2">*</span>dh).priv_key;
             }
         }
     }
 }

 <span class="attribute">#[cfg(test)]
 </span><span class="kw">mod </span>tests {
     <span class="kw">use </span><span class="kw">crate</span>::bn::BigNum;
     <span class="kw">use </span><span class="kw">crate</span>::dh::Dh;
     <span class="kw">use </span><span class="kw">crate</span>::ssl::{SslContext, SslMethod};

     <span class="attribute">#[test]
     #[cfg(ossl102)]
     </span><span class="kw">fn </span>test_dh_rfc5114() {
         <span class="kw">let </span><span class="kw-2">mut </span>ctx = SslContext::builder(SslMethod::tls()).unwrap();
         <span class="kw">let </span>dh2 = Dh::get_2048_224().unwrap();
         ctx.set_tmp_dh(<span class="kw-2">&amp;</span>dh2).unwrap();
         <span class="kw">let </span>dh3 = Dh::get_2048_256().unwrap();
         ctx.set_tmp_dh(<span class="kw-2">&amp;</span>dh3).unwrap();
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_dh_params() {
         <span class="kw">let </span><span class="kw-2">mut </span>ctx = SslContext::builder(SslMethod::tls()).unwrap();
         <span class="kw">let </span>prime_p = BigNum::from_hex_str(
             <span class="string">&quot;87A8E61DB4B6663CFFBBD19C651959998CEEF608660DD0F25D2CEED4435E3B00E00DF8F1D61957D4FAF7DF\
              4561B2AA3016C3D91134096FAA3BF4296D830E9A7C209E0C6497517ABD5A8A9D306BCF67ED91F9E6725B47\
              58C022E0B1EF4275BF7B6C5BFC11D45F9088B941F54EB1E59BB8BC39A0BF12307F5C4FDB70C581B23F76B6\
              3ACAE1CAA6B7902D52526735488A0EF13C6D9A51BFA4AB3AD8347796524D8EF6A167B5A41825D967E144E5\
              140564251CCACB83E6B486F6B3CA3F7971506026C0B857F689962856DED4010ABD0BE621C3A3960A54E710\
              C375F26375D7014103A4B54330C198AF126116D2276E11715F693877FAD7EF09CADB094AE91E1A1597&quot;</span>,
         ).unwrap();
         <span class="kw">let </span>prime_q = BigNum::from_hex_str(
             <span class="string">&quot;3FB32C9B73134D0B2E77506660EDBD484CA7B18F21EF205407F4793A1A0BA12510DBC15077BE463FFF4FED\
              4AAC0BB555BE3A6C1B0C6B47B1BC3773BF7E8C6F62901228F8C28CBB18A55AE31341000A650196F931C77A\
              57F2DDF463E5E9EC144B777DE62AAAB8A8628AC376D282D6ED3864E67982428EBC831D14348F6F2F9193B5\
              045AF2767164E1DFC967C1FB3F2E55A4BD1BFFE83B9C80D052B985D182EA0ADB2A3B7313D3FE14C8484B1E\
              052588B9B7D2BBD2DF016199ECD06E1557CD0915B3353BBB64E0EC377FD028370DF92B52C7891428CDC67E\
              B6184B523D1DB246C32F63078490F00EF8D647D148D47954515E2327CFEF98C582664B4C0F6CC41659&quot;</span>,
         ).unwrap();
         <span class="kw">let </span>generator = BigNum::from_hex_str(
             <span class="string">&quot;8CF83642A709A097B447997640129DA299B1A47D1EB3750BA308B0FE64F5FBD3&quot;</span>,
         )
         .unwrap();
         <span class="kw">let </span>dh = Dh::from_params(
             prime_p.to_owned().unwrap(),
             generator.to_owned().unwrap(),
             prime_q.to_owned().unwrap(),
         )
         .unwrap();
         ctx.set_tmp_dh(<span class="kw-2">&amp;</span>dh).unwrap();

         <span class="macro">assert_eq!</span>(dh.prime_p(), <span class="kw-2">&amp;</span>prime_p);
         <span class="macro">assert_eq!</span>(dh.prime_q().unwrap(), <span class="kw-2">&amp;</span>prime_q);
         <span class="macro">assert_eq!</span>(dh.generator(), <span class="kw-2">&amp;</span>generator);
     }

     <span class="attribute">#[test]
     #[cfg(ossl102)]
     </span><span class="kw">fn </span>test_dh_stored_restored() {
         <span class="kw">let </span>dh1 = Dh::get_2048_256().unwrap();
         <span class="kw">let </span>key1 = dh1.generate_key().unwrap();

         <span class="kw">let </span>dh2 = Dh::get_2048_256().unwrap();
         <span class="kw">let </span>key2 = dh2
             .set_private_key(key1.private_key().to_owned().unwrap())
             .unwrap();

         <span class="macro">assert_eq!</span>(key1.public_key(), key2.public_key());
         <span class="macro">assert_eq!</span>(key1.private_key(), key2.private_key());
     }

     <span class="attribute">#[test]
     #[cfg(ossl102)]
     </span><span class="kw">fn </span>test_set_keys() {
         <span class="kw">let </span>dh1 = Dh::get_2048_256().unwrap();
         <span class="kw">let </span>key1 = dh1.generate_key().unwrap();

         <span class="kw">let </span>dh2 = Dh::get_2048_256().unwrap();
         <span class="kw">let </span>key2 = dh2
             .set_public_key(key1.public_key().to_owned().unwrap())
             .unwrap();

         <span class="macro">assert_eq!</span>(key1.public_key(), key2.public_key());

         <span class="kw">let </span>dh3 = Dh::get_2048_256().unwrap();
         <span class="kw">let </span>key3 = dh3
             .set_key(
                 key1.public_key().to_owned().unwrap(),
                 key1.private_key().to_owned().unwrap(),
             )
             .unwrap();
         <span class="macro">assert_eq!</span>(key1.public_key(), key3.public_key());
         <span class="macro">assert_eq!</span>(key1.private_key(), key3.private_key());
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_dh_from_pem() {
         <span class="kw">let </span><span class="kw-2">mut </span>ctx = SslContext::builder(SslMethod::tls()).unwrap();
         <span class="kw">let </span>params = <span class="macro">include_bytes!</span>(<span class="string">&quot;../test/dhparams.pem&quot;</span>);
         <span class="kw">let </span>dh = Dh::params_from_pem(params).unwrap();
         ctx.set_tmp_dh(<span class="kw-2">&amp;</span>dh).unwrap();
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_dh_from_der() {
         <span class="kw">let </span>params = <span class="macro">include_bytes!</span>(<span class="string">&quot;../test/dhparams.pem&quot;</span>);
         <span class="kw">let </span>dh = Dh::params_from_pem(params).unwrap();
         <span class="kw">let </span>der = dh.params_to_der().unwrap();
         Dh::params_from_der(<span class="kw-2">&amp;</span>der).unwrap();
     }

     <span class="attribute">#[test]
     #[cfg(ossl102)]
     </span><span class="kw">fn </span>test_dh_generate_key_compute_key() {
         <span class="kw">let </span>dh1 = Dh::get_2048_224().unwrap().generate_key().unwrap();
         <span class="kw">let </span>dh2 = Dh::get_2048_224().unwrap().generate_key().unwrap();

         <span class="kw">let </span>shared_a = dh1.compute_key(dh2.public_key()).unwrap();
         <span class="kw">let </span>shared_b = dh2.compute_key(dh1.public_key()).unwrap();

         <span class="macro">assert_eq!</span>(shared_a, shared_b);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_dh_generate_params_generate_key_compute_key() {
         <span class="kw">let </span>dh_params1 = Dh::generate_params(<span class="number">512</span>, <span class="number">2</span>).unwrap();
         <span class="kw">let </span>dh_params2 = Dh::from_pqg(
             dh_params1.prime_p().to_owned().unwrap(),
             <span class="prelude-val">None</span>,
             dh_params1.generator().to_owned().unwrap(),
         )
         .unwrap();

         <span class="kw">let </span>dh1 = dh_params1.generate_key().unwrap();
         <span class="kw">let </span>dh2 = dh_params2.generate_key().unwrap();

         <span class="kw">let </span>shared_a = dh1.compute_key(dh2.public_key()).unwrap();
         <span class="kw">let </span>shared_b = dh2.compute_key(dh1.public_key()).unwrap();

         <span class="macro">assert_eq!</span>(shared_a, shared_b);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_dh_check_key() {
         <span class="kw">let </span>dh1 = Dh::generate_params(<span class="number">512</span>, <span class="number">2</span>).unwrap();
         <span class="kw">let </span>p = BigNum::from_hex_str(<span class="string">&quot;04&quot;</span>).unwrap();
         <span class="kw">let </span>g = BigNum::from_hex_str(<span class="string">&quot;02&quot;</span>).unwrap();
         <span class="kw">let </span>dh2 = Dh::from_pqg(p, <span class="prelude-val">None</span>, g).unwrap();
         <span class="macro">assert!</span>(dh1.check_key().unwrap());
         <span class="macro">assert!</span>(!dh2.check_key().unwrap());
     }
 }
 </code></pre></div>
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