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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 `/home/runner/.cargo/registry/src/index.crates.io-6f17d22bba15001f/openssl-0.10.70/src/derive.rs`."><title>derive.rs - source</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../static.files/rustdoc-42caa33d.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="openssl" data-themes="" data-resource-suffix="" data-rustdoc-version="1.84.1 (e71f9a9a9 2025-01-27)" data-channel="1.84.1" data-search-js="search-92e6798f.js" data-settings-js="settings-0f613d39.js" ><script src="../../static.files/storage-59e33391.js"></script><script defer src="../../static.files/src-script-56102188.js"></script><script defer src="../../src-files.js"></script><script defer src="../../static.files/main-5f194d8c.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-893ab5e7.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-6580c154.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-044be391.svg"></head><body class="rustdoc src"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="src-sidebar-title"><h2>Files</h2></div></nav><div class="sidebar-resizer"></div><main><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><h1><div class="sub-heading">openssl/</div>derive.rs</h1><rustdoc-toolbar></rustdoc-toolbar></div><div class="example-wrap"><div data-nosnippet><pre class="src-line-numbers">
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<a href="#217" id="217">217</a></pre></div><pre class="rust"><code><span class="doccomment">//! Shared secret derivation.
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//!
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//! # Example
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//!
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//! The following example implements [ECDH] using `NIST P-384` keys:
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//!
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//! ```
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//! # fn main() -> Result<(), Box<dyn std::error::Error>> {
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//! # use std::convert::TryInto;
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//! use openssl::bn::BigNumContext;
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//! use openssl::pkey::PKey;
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//! use openssl::derive::Deriver;
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//! use openssl::ec::{EcGroup, EcKey, EcPoint, PointConversionForm};
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//! use openssl::nid::Nid;
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//!
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//! let group = EcGroup::from_curve_name(Nid::SECP384R1)?;
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//!
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//! let first: PKey<_> = EcKey::generate(&group)?.try_into()?;
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//!
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//! // second party generates an ephemeral key and derives
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//! // a shared secret using first party's public key
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//! let shared_key = EcKey::generate(&group)?;
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//! // shared_public is sent to first party
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//! let mut ctx = BigNumContext::new()?;
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//! let shared_public = shared_key.public_key().to_bytes(
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//! &group,
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//! PointConversionForm::COMPRESSED,
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//! &mut ctx,
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//! )?;
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//!
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//! let shared_key: PKey<_> = shared_key.try_into()?;
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//! let mut deriver = Deriver::new(&shared_key)?;
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//! deriver.set_peer(&first)?;
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//! // secret can be used e.g. as a symmetric encryption key
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//! let secret = deriver.derive_to_vec()?;
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//! # drop(deriver);
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//!
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//! // first party derives the same shared secret using
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//! // shared_public
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//! let point = EcPoint::from_bytes(&group, &shared_public, &mut ctx)?;
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//! let recipient_key: PKey<_> = EcKey::from_public_key(&group, &point)?.try_into()?;
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//! let mut deriver = Deriver::new(&first)?;
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//! deriver.set_peer(&recipient_key)?;
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//! let first_secret = deriver.derive_to_vec()?;
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//!
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//! assert_eq!(secret, first_secret);
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//! # Ok(()) }
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//! ```
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//!
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//! [ECDH]: https://wiki.openssl.org/index.php/Elliptic_Curve_Diffie_Hellman
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</span><span class="kw">use </span>foreign_types::ForeignTypeRef;
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<span class="kw">use </span>std::marker::PhantomData;
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<span class="kw">use </span>std::ptr;
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<span class="kw">use </span><span class="kw">crate</span>::error::ErrorStack;
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<span class="kw">use </span><span class="kw">crate</span>::pkey::{HasPrivate, HasPublic, PKeyRef};
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<span class="kw">use crate</span>::{cvt, cvt_p};
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<span class="kw">use </span>openssl_macros::corresponds;
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<span class="doccomment">/// A type used to derive a shared secret between two keys.
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</span><span class="kw">pub struct </span>Deriver<<span class="lifetime">'a</span>>(<span class="kw-2">*mut </span>ffi::EVP_PKEY_CTX, PhantomData<<span class="kw-2">&</span><span class="lifetime">'a </span>()>);
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<span class="kw">unsafe impl </span>Sync <span class="kw">for </span>Deriver<<span class="lifetime">'_</span>> {}
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<span class="kw">unsafe impl </span>Send <span class="kw">for </span>Deriver<<span class="lifetime">'_</span>> {}
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<span class="attr">#[allow(clippy::len_without_is_empty)]
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</span><span class="kw">impl</span><<span class="lifetime">'a</span>> Deriver<<span class="lifetime">'a</span>> {
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<span class="doccomment">/// Creates a new `Deriver` using the provided private key.
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///
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/// This corresponds to [`EVP_PKEY_derive_init`].
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///
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/// [`EVP_PKEY_derive_init`]: https://www.openssl.org/docs/manmaster/crypto/EVP_PKEY_derive_init.html
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</span><span class="kw">pub fn </span>new<T>(key: <span class="kw-2">&</span><span class="lifetime">'a </span>PKeyRef<T>) -> <span class="prelude-ty">Result</span><Deriver<<span class="lifetime">'a</span>>, ErrorStack>
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<span class="kw">where
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</span>T: HasPrivate,
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{
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<span class="kw">unsafe </span>{
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cvt_p(ffi::EVP_PKEY_CTX_new(key.as_ptr(), ptr::null_mut()))
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.map(|p| Deriver(p, PhantomData))
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.and_then(|ctx| cvt(ffi::EVP_PKEY_derive_init(ctx.<span class="number">0</span>)).map(|<span class="kw">_</span>| ctx))
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}
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}
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<span class="doccomment">/// Sets the peer key used for secret derivation.
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</span><span class="attr">#[corresponds(EVP_PKEY_derive_set_peer)]
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</span><span class="kw">pub fn </span>set_peer<T>(<span class="kw-2">&mut </span><span class="self">self</span>, key: <span class="kw-2">&</span><span class="lifetime">'a </span>PKeyRef<T>) -> <span class="prelude-ty">Result</span><(), ErrorStack>
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<span class="kw">where
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</span>T: HasPublic,
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{
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<span class="kw">unsafe </span>{ cvt(ffi::EVP_PKEY_derive_set_peer(<span class="self">self</span>.<span class="number">0</span>, key.as_ptr())).map(|<span class="kw">_</span>| ()) }
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}
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<span class="doccomment">/// Sets the peer key used for secret derivation along with optionally validating the peer public key.
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///
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/// Requires OpenSSL 3.0.0 or newer.
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</span><span class="attr">#[corresponds(EVP_PKEY_derive_set_peer_ex)]
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#[cfg(ossl300)]
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</span><span class="kw">pub fn </span>set_peer_ex<T>(
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<span class="kw-2">&mut </span><span class="self">self</span>,
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key: <span class="kw-2">&</span><span class="lifetime">'a </span>PKeyRef<T>,
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|
validate_peer: bool,
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|
) -> <span class="prelude-ty">Result</span><(), ErrorStack>
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|
<span class="kw">where
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|
</span>T: HasPublic,
|
|
{
|
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<span class="kw">unsafe </span>{
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cvt(ffi::EVP_PKEY_derive_set_peer_ex(
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<span class="self">self</span>.<span class="number">0</span>,
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key.as_ptr(),
|
|
validate_peer <span class="kw">as </span>i32,
|
|
))
|
|
.map(|<span class="kw">_</span>| ())
|
|
}
|
|
}
|
|
|
|
<span class="doccomment">/// Returns the size of the shared secret.
|
|
///
|
|
/// It can be used to size the buffer passed to [`Deriver::derive`].
|
|
///
|
|
/// This corresponds to [`EVP_PKEY_derive`].
|
|
///
|
|
/// [`Deriver::derive`]: #method.derive
|
|
/// [`EVP_PKEY_derive`]: https://www.openssl.org/docs/manmaster/crypto/EVP_PKEY_derive_init.html
|
|
</span><span class="kw">pub fn </span>len(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><usize, ErrorStack> {
|
|
<span class="kw">unsafe </span>{
|
|
<span class="kw">let </span><span class="kw-2">mut </span>len = <span class="number">0</span>;
|
|
cvt(ffi::EVP_PKEY_derive(<span class="self">self</span>.<span class="number">0</span>, ptr::null_mut(), <span class="kw-2">&mut </span>len)).map(|<span class="kw">_</span>| len)
|
|
}
|
|
}
|
|
|
|
<span class="doccomment">/// Derives a shared secret between the two keys, writing it into the buffer.
|
|
///
|
|
/// Returns the number of bytes written.
|
|
///
|
|
/// This corresponds to [`EVP_PKEY_derive`].
|
|
///
|
|
/// [`EVP_PKEY_derive`]: https://www.openssl.org/docs/manmaster/crypto/EVP_PKEY_derive_init.html
|
|
</span><span class="kw">pub fn </span>derive(<span class="kw-2">&mut </span><span class="self">self</span>, buf: <span class="kw-2">&mut </span>[u8]) -> <span class="prelude-ty">Result</span><usize, ErrorStack> {
|
|
<span class="kw">let </span><span class="kw-2">mut </span>len = buf.len();
|
|
<span class="kw">unsafe </span>{
|
|
cvt(ffi::EVP_PKEY_derive(
|
|
<span class="self">self</span>.<span class="number">0</span>,
|
|
buf.as_mut_ptr() <span class="kw">as </span><span class="kw-2">*mut </span><span class="kw">_</span>,
|
|
<span class="kw-2">&mut </span>len,
|
|
))
|
|
.map(|<span class="kw">_</span>| len)
|
|
}
|
|
}
|
|
|
|
<span class="doccomment">/// A convenience function which derives a shared secret and returns it in a new buffer.
|
|
///
|
|
/// This simply wraps [`Deriver::len`] and [`Deriver::derive`].
|
|
///
|
|
/// [`Deriver::len`]: #method.len
|
|
/// [`Deriver::derive`]: #method.derive
|
|
</span><span class="kw">pub fn </span>derive_to_vec(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><Vec<u8>, ErrorStack> {
|
|
<span class="kw">let </span>len = <span class="self">self</span>.len()<span class="question-mark">?</span>;
|
|
<span class="kw">let </span><span class="kw-2">mut </span>buf = <span class="macro">vec!</span>[<span class="number">0</span>; len];
|
|
<span class="kw">let </span>len = <span class="self">self</span>.derive(<span class="kw-2">&mut </span>buf)<span class="question-mark">?</span>;
|
|
buf.truncate(len);
|
|
<span class="prelude-val">Ok</span>(buf)
|
|
}
|
|
}
|
|
|
|
<span class="kw">impl </span>Drop <span class="kw">for </span>Deriver<<span class="lifetime">'_</span>> {
|
|
<span class="kw">fn </span>drop(<span class="kw-2">&mut </span><span class="self">self</span>) {
|
|
<span class="kw">unsafe </span>{
|
|
ffi::EVP_PKEY_CTX_free(<span class="self">self</span>.<span class="number">0</span>);
|
|
}
|
|
}
|
|
}
|
|
|
|
<span class="attr">#[cfg(test)]
|
|
</span><span class="kw">mod </span>test {
|
|
<span class="kw">use super</span>::<span class="kw-2">*</span>;
|
|
|
|
<span class="kw">use </span><span class="kw">crate</span>::ec::{EcGroup, EcKey};
|
|
<span class="kw">use </span><span class="kw">crate</span>::nid::Nid;
|
|
<span class="kw">use </span><span class="kw">crate</span>::pkey::PKey;
|
|
|
|
<span class="attr">#[test]
|
|
</span><span class="kw">fn </span>derive_without_peer() {
|
|
<span class="kw">let </span>group = EcGroup::from_curve_name(Nid::X9_62_PRIME256V1).unwrap();
|
|
<span class="kw">let </span>ec_key = EcKey::generate(<span class="kw-2">&</span>group).unwrap();
|
|
<span class="kw">let </span>pkey = PKey::from_ec_key(ec_key).unwrap();
|
|
<span class="kw">let </span><span class="kw-2">mut </span>deriver = Deriver::new(<span class="kw-2">&</span>pkey).unwrap();
|
|
deriver.derive_to_vec().unwrap_err();
|
|
}
|
|
|
|
<span class="attr">#[test]
|
|
</span><span class="kw">fn </span>test_ec_key_derive() {
|
|
<span class="kw">let </span>group = EcGroup::from_curve_name(Nid::X9_62_PRIME256V1).unwrap();
|
|
<span class="kw">let </span>ec_key = EcKey::generate(<span class="kw-2">&</span>group).unwrap();
|
|
<span class="kw">let </span>ec_key2 = EcKey::generate(<span class="kw-2">&</span>group).unwrap();
|
|
<span class="kw">let </span>pkey = PKey::from_ec_key(ec_key).unwrap();
|
|
<span class="kw">let </span>pkey2 = PKey::from_ec_key(ec_key2).unwrap();
|
|
<span class="kw">let </span><span class="kw-2">mut </span>deriver = Deriver::new(<span class="kw-2">&</span>pkey).unwrap();
|
|
deriver.set_peer(<span class="kw-2">&</span>pkey2).unwrap();
|
|
<span class="kw">let </span>shared = deriver.derive_to_vec().unwrap();
|
|
<span class="macro">assert!</span>(!shared.is_empty());
|
|
}
|
|
|
|
<span class="attr">#[test]
|
|
#[cfg(ossl300)]
|
|
</span><span class="kw">fn </span>test_ec_key_derive_ex() {
|
|
<span class="kw">let </span>group = EcGroup::from_curve_name(Nid::X9_62_PRIME256V1).unwrap();
|
|
<span class="kw">let </span>ec_key = EcKey::generate(<span class="kw-2">&</span>group).unwrap();
|
|
<span class="kw">let </span>ec_key2 = EcKey::generate(<span class="kw-2">&</span>group).unwrap();
|
|
<span class="kw">let </span>pkey = PKey::from_ec_key(ec_key).unwrap();
|
|
<span class="kw">let </span>pkey2 = PKey::from_ec_key(ec_key2).unwrap();
|
|
<span class="kw">let </span><span class="kw-2">mut </span>deriver = Deriver::new(<span class="kw-2">&</span>pkey).unwrap();
|
|
deriver.set_peer_ex(<span class="kw-2">&</span>pkey2, <span class="bool-val">true</span>).unwrap();
|
|
<span class="kw">let </span>shared = deriver.derive_to_vec().unwrap();
|
|
<span class="macro">assert!</span>(!shared.is_empty());
|
|
}
|
|
}
|
|
</code></pre></div></section></main></body></html> |