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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/dsa.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>dsa.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">//! Digital Signatures
//!
//! DSA ensures a message originated from a known sender, and was not modified.
//! DSA uses asymmetrical keys and an algorithm to output a signature of the message
//! using the private key that can be validated with the public key but not be generated
//! without the private key.
</span><span class="kw">use </span>cfg_if::cfg_if;
<span class="kw">use </span>foreign_types::{ForeignType, ForeignTypeRef};
<span class="kw">use </span>libc::c_int;
<span class="kw">use </span>std::fmt;
<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 </span><span class="kw">crate</span>::util::ForeignTypeRefExt;
<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::DSA;
<span class="kw">fn </span>drop = ffi::DSA_free;
<span class="doccomment">/// Object representing DSA keys.
///
/// A DSA object contains the parameters p, q, and g. There is a private
/// and public key. The values p, g, and q are:
///
/// * `p`: DSA prime parameter
/// * `q`: DSA sub-prime parameter
/// * `g`: DSA base parameter
///
/// These values are used to calculate a pair of asymmetrical keys used for
/// signing.
///
/// OpenSSL documentation at [`DSA_new`]
///
/// [`DSA_new`]: https://www.openssl.org/docs/manmaster/crypto/DSA_new.html
///
/// # Examples
///
/// ```
/// use openssl::dsa::Dsa;
/// use openssl::error::ErrorStack;
/// use openssl::pkey::Private;
///
/// fn create_dsa() -&gt; Result&lt;Dsa&lt;Private&gt;, ErrorStack&gt; {
/// let sign = Dsa::generate(2048)?;
/// Ok(sign)
/// }
/// # fn main() {
/// # create_dsa();
/// # }
/// ```
</span><span class="kw">pub struct </span>Dsa&lt;T&gt;;
<span class="doccomment">/// Reference to [`Dsa`].
///
/// [`Dsa`]: struct.Dsa.html
</span><span class="kw">pub struct </span>DsaRef&lt;T&gt;;
}
<span class="kw">impl</span>&lt;T&gt; Clone <span class="kw">for </span>Dsa&lt;T&gt; {
<span class="kw">fn </span>clone(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Dsa&lt;T&gt; {
(<span class="kw-2">**</span><span class="self">self</span>).to_owned()
}
}
<span class="kw">impl</span>&lt;T&gt; ToOwned <span class="kw">for </span>DsaRef&lt;T&gt; {
<span class="kw">type </span>Owned = Dsa&lt;T&gt;;
<span class="kw">fn </span>to_owned(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Dsa&lt;T&gt; {
<span class="kw">unsafe </span>{
ffi::DSA_up_ref(<span class="self">self</span>.as_ptr());
Dsa::from_ptr(<span class="self">self</span>.as_ptr())
}
}
}
<span class="kw">impl</span>&lt;T&gt; DsaRef&lt;T&gt;
<span class="kw">where
</span>T: HasPublic,
{
<span class="macro">to_pem! </span>{
<span class="doccomment">/// Serializes the public key into a PEM-encoded SubjectPublicKeyInfo structure.
///
/// The output will have a header of `-----BEGIN PUBLIC KEY-----`.
</span><span class="attribute">#[corresponds(PEM_write_bio_DSA_PUBKEY)]
</span>public_key_to_pem,
ffi::PEM_write_bio_DSA_PUBKEY
}
<span class="macro">to_der! </span>{
<span class="doccomment">/// Serializes the public key into a DER-encoded SubjectPublicKeyInfo structure.
</span><span class="attribute">#[corresponds(i2d_DSA_PUBKEY)]
</span>public_key_to_der,
ffi::i2d_DSA_PUBKEY
}
<span class="doccomment">/// Returns a reference to the public key component of `self`.
</span><span class="attribute">#[corresponds(DSA_get0_key)]
</span><span class="kw">pub fn </span>pub_key(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>BigNumRef {
<span class="kw">unsafe </span>{
<span class="kw">let </span><span class="kw-2">mut </span>pub_key = ptr::null();
DSA_get0_key(<span class="self">self</span>.as_ptr(), <span class="kw-2">&amp;mut </span>pub_key, ptr::null_mut());
BigNumRef::from_const_ptr(pub_key)
}
}
}
<span class="kw">impl</span>&lt;T&gt; DsaRef&lt;T&gt;
<span class="kw">where
</span>T: HasPrivate,
{
<span class="macro">private_key_to_pem! </span>{
<span class="doccomment">/// Serializes the private key to a PEM-encoded DSAPrivateKey structure.
///
/// The output will have a header of `-----BEGIN DSA PRIVATE KEY-----`.
</span><span class="attribute">#[corresponds(PEM_write_bio_DSAPrivateKey)]
</span>private_key_to_pem,
<span class="doccomment">/// Serializes the private key to a PEM-encoded encrypted DSAPrivateKey structure.
///
/// The output will have a header of `-----BEGIN DSA PRIVATE KEY-----`.
</span><span class="attribute">#[corresponds(PEM_write_bio_DSAPrivateKey)]
</span>private_key_to_pem_passphrase,
ffi::PEM_write_bio_DSAPrivateKey
}
<span class="macro">to_der! </span>{
<span class="doccomment">/// Serializes the private_key to a DER-encoded `DSAPrivateKey` structure.
</span><span class="attribute">#[corresponds(i2d_DSAPrivateKey)]
</span>private_key_to_der,
ffi::i2d_DSAPrivateKey
}
<span class="doccomment">/// Returns a reference to the private key component of `self`.
</span><span class="attribute">#[corresponds(DSA_get0_key)]
</span><span class="kw">pub fn </span>priv_key(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>BigNumRef {
<span class="kw">unsafe </span>{
<span class="kw">let </span><span class="kw-2">mut </span>priv_key = ptr::null();
DSA_get0_key(<span class="self">self</span>.as_ptr(), ptr::null_mut(), <span class="kw-2">&amp;mut </span>priv_key);
BigNumRef::from_const_ptr(priv_key)
}
}
}
<span class="kw">impl</span>&lt;T&gt; DsaRef&lt;T&gt;
<span class="kw">where
</span>T: HasParams,
{
<span class="doccomment">/// Returns the maximum size of the signature output by `self` in bytes.
</span><span class="attribute">#[corresponds(DSA_size)]
</span><span class="kw">pub fn </span>size(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; u32 {
<span class="kw">unsafe </span>{ ffi::DSA_size(<span class="self">self</span>.as_ptr()) <span class="kw">as </span>u32 }
}
<span class="doccomment">/// Returns the DSA prime parameter of `self`.
</span><span class="attribute">#[corresponds(DSA_get0_pqg)]
</span><span class="kw">pub fn </span>p(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>BigNumRef {
<span class="kw">unsafe </span>{
<span class="kw">let </span><span class="kw-2">mut </span>p = ptr::null();
DSA_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_const_ptr(p)
}
}
<span class="doccomment">/// Returns the DSA sub-prime parameter of `self`.
</span><span class="attribute">#[corresponds(DSA_get0_pqg)]
</span><span class="kw">pub fn </span>q(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>BigNumRef {
<span class="kw">unsafe </span>{
<span class="kw">let </span><span class="kw-2">mut </span>q = ptr::null();
DSA_get0_pqg(<span class="self">self</span>.as_ptr(), ptr::null_mut(), <span class="kw-2">&amp;mut </span>q, ptr::null_mut());
BigNumRef::from_const_ptr(q)
}
}
<span class="doccomment">/// Returns the DSA base parameter of `self`.
</span><span class="attribute">#[corresponds(DSA_get0_pqg)]
</span><span class="kw">pub fn </span>g(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>BigNumRef {
<span class="kw">unsafe </span>{
<span class="kw">let </span><span class="kw-2">mut </span>g = ptr::null();
DSA_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_const_ptr(g)
}
}
}
<span class="attribute">#[cfg(boringssl)]
</span><span class="kw">type </span>BitType = libc::c_uint;
<span class="attribute">#[cfg(not(boringssl))]
</span><span class="kw">type </span>BitType = c_int;
<span class="kw">impl </span>Dsa&lt;Params&gt; {
<span class="doccomment">/// Creates a DSA params based upon the given parameters.
</span><span class="attribute">#[corresponds(DSA_set0_pqg)]
</span><span class="kw">pub fn </span>from_pqg(p: BigNum, q: BigNum, g: BigNum) -&gt; <span class="prelude-ty">Result</span>&lt;Dsa&lt;Params&gt;, ErrorStack&gt; {
<span class="kw">unsafe </span>{
<span class="kw">let </span>dsa = Dsa::from_ptr(cvt_p(ffi::DSA_new())<span class="question-mark">?</span>);
cvt(DSA_set0_pqg(dsa.<span class="number">0</span>, p.as_ptr(), q.as_ptr(), g.as_ptr()))<span class="question-mark">?</span>;
mem::forget((p, q, g));
<span class="prelude-val">Ok</span>(dsa)
}
}
<span class="doccomment">/// Generates DSA params based on the given number of bits.
</span><span class="attribute">#[corresponds(DSA_generate_parameters_ex)]
</span><span class="kw">pub fn </span>generate_params(bits: u32) -&gt; <span class="prelude-ty">Result</span>&lt;Dsa&lt;Params&gt;, ErrorStack&gt; {
ffi::init();
<span class="kw">unsafe </span>{
<span class="kw">let </span>dsa = Dsa::from_ptr(cvt_p(ffi::DSA_new())<span class="question-mark">?</span>);
cvt(ffi::DSA_generate_parameters_ex(
dsa.<span class="number">0</span>,
bits <span class="kw">as </span>BitType,
ptr::null(),
<span class="number">0</span>,
ptr::null_mut(),
ptr::null_mut(),
ptr::null_mut(),
))<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(dsa)
}
}
<span class="doccomment">/// Generates a private key based on the DSA params.
</span><span class="attribute">#[corresponds(DSA_generate_key)]
</span><span class="kw">pub fn </span>generate_key(<span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;Dsa&lt;Private&gt;, ErrorStack&gt; {
<span class="kw">unsafe </span>{
<span class="kw">let </span>dsa_ptr = <span class="self">self</span>.<span class="number">0</span>;
cvt(ffi::DSA_generate_key(dsa_ptr))<span class="question-mark">?</span>;
mem::forget(<span class="self">self</span>);
<span class="prelude-val">Ok</span>(Dsa::from_ptr(dsa_ptr))
}
}
}
<span class="kw">impl </span>Dsa&lt;Private&gt; {
<span class="doccomment">/// Generate a DSA key pair.
///
/// The `bits` parameter corresponds to the length of the prime `p`.
</span><span class="kw">pub fn </span>generate(bits: u32) -&gt; <span class="prelude-ty">Result</span>&lt;Dsa&lt;Private&gt;, ErrorStack&gt; {
<span class="kw">let </span>params = Dsa::generate_params(bits)<span class="question-mark">?</span>;
params.generate_key()
}
<span class="doccomment">/// Create a DSA key pair with the given parameters
///
/// `p`, `q` and `g` are the common parameters.
/// `priv_key` is the private component of the key pair.
/// `pub_key` is the public component of the key. Can be computed via `g^(priv_key) mod p`
</span><span class="kw">pub fn </span>from_private_components(
p: BigNum,
q: BigNum,
g: BigNum,
priv_key: BigNum,
pub_key: BigNum,
) -&gt; <span class="prelude-ty">Result</span>&lt;Dsa&lt;Private&gt;, ErrorStack&gt; {
ffi::init();
<span class="kw">unsafe </span>{
<span class="kw">let </span>dsa = Dsa::from_ptr(cvt_p(ffi::DSA_new())<span class="question-mark">?</span>);
cvt(DSA_set0_pqg(dsa.<span class="number">0</span>, p.as_ptr(), q.as_ptr(), g.as_ptr()))<span class="question-mark">?</span>;
mem::forget((p, q, g));
cvt(DSA_set0_key(dsa.<span class="number">0</span>, pub_key.as_ptr(), priv_key.as_ptr()))<span class="question-mark">?</span>;
mem::forget((pub_key, priv_key));
<span class="prelude-val">Ok</span>(dsa)
}
}
}
<span class="kw">impl </span>Dsa&lt;Public&gt; {
<span class="macro">from_pem! </span>{
<span class="doccomment">/// Decodes a PEM-encoded SubjectPublicKeyInfo structure containing a DSA key.
///
/// The input should have a header of `-----BEGIN PUBLIC KEY-----`.
</span><span class="attribute">#[corresponds(PEM_read_bio_DSA_PUBKEY)]
</span>public_key_from_pem,
Dsa&lt;Public&gt;,
ffi::PEM_read_bio_DSA_PUBKEY
}
<span class="macro">from_der! </span>{
<span class="doccomment">/// Decodes a DER-encoded SubjectPublicKeyInfo structure containing a DSA key.
</span><span class="attribute">#[corresponds(d2i_DSA_PUBKEY)]
</span>public_key_from_der,
Dsa&lt;Public&gt;,
ffi::d2i_DSA_PUBKEY
}
<span class="doccomment">/// Create a new DSA key with only public components.
///
/// `p`, `q` and `g` are the common parameters.
/// `pub_key` is the public component of the key.
</span><span class="kw">pub fn </span>from_public_components(
p: BigNum,
q: BigNum,
g: BigNum,
pub_key: BigNum,
) -&gt; <span class="prelude-ty">Result</span>&lt;Dsa&lt;Public&gt;, ErrorStack&gt; {
ffi::init();
<span class="kw">unsafe </span>{
<span class="kw">let </span>dsa = Dsa::from_ptr(cvt_p(ffi::DSA_new())<span class="question-mark">?</span>);
cvt(DSA_set0_pqg(dsa.<span class="number">0</span>, p.as_ptr(), q.as_ptr(), g.as_ptr()))<span class="question-mark">?</span>;
mem::forget((p, q, g));
cvt(DSA_set0_key(dsa.<span class="number">0</span>, pub_key.as_ptr(), ptr::null_mut()))<span class="question-mark">?</span>;
mem::forget(pub_key);
<span class="prelude-val">Ok</span>(dsa)
}
}
}
<span class="kw">impl</span>&lt;T&gt; fmt::Debug <span class="kw">for </span>Dsa&lt;T&gt; {
<span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
<span class="macro">write!</span>(f, <span class="string">&quot;DSA&quot;</span>)
}
}
<span class="macro">cfg_if! </span>{
<span class="kw">if </span><span class="attribute">#[cfg(any(ossl110, libressl273))] </span>{
<span class="kw">use </span>ffi::{DSA_get0_key, DSA_get0_pqg, DSA_set0_key, DSA_set0_pqg};
} <span class="kw">else </span>{
<span class="attribute">#[allow(bad_style)]
</span><span class="kw">unsafe fn </span>DSA_get0_pqg(
d: <span class="kw-2">*mut </span>ffi::DSA,
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>d).p;
}
<span class="kw">if </span>!q.is_null() {
<span class="kw-2">*</span>q = (<span class="kw-2">*</span>d).q;
}
<span class="kw">if </span>!g.is_null() {
<span class="kw-2">*</span>g = (<span class="kw-2">*</span>d).g;
}
}
<span class="attribute">#[allow(bad_style)]
</span><span class="kw">unsafe fn </span>DSA_get0_key(
d: <span class="kw-2">*mut </span>ffi::DSA,
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>d).pub_key;
}
<span class="kw">if </span>!priv_key.is_null() {
<span class="kw-2">*</span>priv_key = (<span class="kw-2">*</span>d).priv_key;
}
}
<span class="attribute">#[allow(bad_style)]
</span><span class="kw">unsafe fn </span>DSA_set0_key(
d: <span class="kw-2">*mut </span>ffi::DSA,
pub_key: <span class="kw-2">*mut </span>ffi::BIGNUM,
priv_key: <span class="kw-2">*mut </span>ffi::BIGNUM) -&gt; c_int
{
(<span class="kw-2">*</span>d).pub_key = pub_key;
(<span class="kw-2">*</span>d).priv_key = priv_key;
<span class="number">1
</span>}
<span class="attribute">#[allow(bad_style)]
</span><span class="kw">unsafe fn </span>DSA_set0_pqg(
d: <span class="kw-2">*mut </span>ffi::DSA,
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; c_int
{
(<span class="kw-2">*</span>d).p = p;
(<span class="kw-2">*</span>d).q = q;
(<span class="kw-2">*</span>d).g = g;
<span class="number">1
</span>}
}
}
<span class="macro">foreign_type_and_impl_send_sync! </span>{
<span class="kw">type </span>CType = ffi::DSA_SIG;
<span class="kw">fn </span>drop = ffi::DSA_SIG_free;
<span class="doccomment">/// Object representing DSA signature.
///
/// DSA signatures consist of two components: `r` and `s`.
///
/// # Examples
///
/// ```
/// use std::convert::TryInto;
///
/// use openssl::bn::BigNum;
/// use openssl::dsa::{Dsa, DsaSig};
/// use openssl::hash::MessageDigest;
/// use openssl::pkey::PKey;
/// use openssl::sign::{Signer, Verifier};
///
/// const TEST_DATA: &amp;[u8] = &amp;[0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
/// let dsa_ref = Dsa::generate(1024).unwrap();
///
/// let pub_key: PKey&lt;_&gt; = dsa_ref.clone().try_into().unwrap();
/// let priv_key: PKey&lt;_&gt; = dsa_ref.try_into().unwrap();
///
/// let mut signer = if let Ok(signer) = Signer::new(MessageDigest::sha256(), &amp;priv_key) {
/// signer
/// } else {
/// // DSA signing is not supported (eg. BoringSSL)
/// return;
/// };
///
/// signer.update(TEST_DATA).unwrap();
///
/// let signature = signer.sign_to_vec().unwrap();
/// // Parse DER-encoded DSA signature
/// let signature = DsaSig::from_der(&amp;signature).unwrap();
///
/// // Extract components `r` and `s`
/// let r = BigNum::from_slice(&amp;signature.r().to_vec()).unwrap();
/// let s = BigNum::from_slice(&amp;signature.s().to_vec()).unwrap();
///
/// // Construct new DSA signature from components
/// let signature = DsaSig::from_private_components(r, s).unwrap();
///
/// // Serialize DSA signature to DER
/// let signature = signature.to_der().unwrap();
///
/// let mut verifier = Verifier::new(MessageDigest::sha256(), &amp;pub_key).unwrap();
/// verifier.update(TEST_DATA).unwrap();
/// assert!(verifier.verify(&amp;signature[..]).unwrap());
/// ```
</span><span class="kw">pub struct </span>DsaSig;
<span class="doccomment">/// Reference to a [`DsaSig`].
</span><span class="kw">pub struct </span>DsaSigRef;
}
<span class="kw">impl </span>DsaSig {
<span class="doccomment">/// Returns a new `DsaSig` by setting the `r` and `s` values associated with an DSA signature.
</span><span class="attribute">#[corresponds(DSA_SIG_set0)]
</span><span class="kw">pub fn </span>from_private_components(r: BigNum, s: BigNum) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>, ErrorStack&gt; {
<span class="kw">unsafe </span>{
<span class="kw">let </span>sig = cvt_p(ffi::DSA_SIG_new())<span class="question-mark">?</span>;
DSA_SIG_set0(sig, r.as_ptr(), s.as_ptr());
mem::forget((r, s));
<span class="prelude-val">Ok</span>(DsaSig::from_ptr(sig))
}
}
<span class="macro">from_der! </span>{
<span class="doccomment">/// Decodes a DER-encoded DSA signature.
</span><span class="attribute">#[corresponds(d2i_DSA_SIG)]
</span>from_der,
DsaSig,
ffi::d2i_DSA_SIG
}
}
<span class="kw">impl </span>fmt::Debug <span class="kw">for </span>DsaSig {
<span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
f.debug_struct(<span class="string">&quot;DsaSig&quot;</span>)
.field(<span class="string">&quot;r&quot;</span>, <span class="self">self</span>.r())
.field(<span class="string">&quot;s&quot;</span>, <span class="self">self</span>.s())
.finish()
}
}
<span class="kw">impl </span>DsaSigRef {
<span class="macro">to_der! </span>{
<span class="doccomment">/// Serializes the DSA signature into a DER-encoded `DSASignature` structure.
</span><span class="attribute">#[corresponds(i2d_DSA_SIG)]
</span>to_der,
ffi::i2d_DSA_SIG
}
<span class="doccomment">/// Returns internal component `r` of an `DsaSig`.
</span><span class="attribute">#[corresponds(DSA_SIG_get0)]
</span><span class="kw">pub fn </span>r(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>BigNumRef {
<span class="kw">unsafe </span>{
<span class="kw">let </span><span class="kw-2">mut </span>r = ptr::null();
DSA_SIG_get0(<span class="self">self</span>.as_ptr(), <span class="kw-2">&amp;mut </span>r, ptr::null_mut());
BigNumRef::from_const_ptr(r)
}
}
<span class="doccomment">/// Returns internal component `s` of an `DsaSig`.
</span><span class="attribute">#[corresponds(DSA_SIG_get0)]
</span><span class="kw">pub fn </span>s(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>BigNumRef {
<span class="kw">unsafe </span>{
<span class="kw">let </span><span class="kw-2">mut </span>s = ptr::null();
DSA_SIG_get0(<span class="self">self</span>.as_ptr(), ptr::null_mut(), <span class="kw-2">&amp;mut </span>s);
BigNumRef::from_const_ptr(s)
}
}
}
<span class="macro">cfg_if! </span>{
<span class="kw">if </span><span class="attribute">#[cfg(any(ossl110, libressl273))] </span>{
<span class="kw">use </span>ffi::{DSA_SIG_set0, DSA_SIG_get0};
} <span class="kw">else </span>{
<span class="attribute">#[allow(bad_style)]
</span><span class="kw">unsafe fn </span>DSA_SIG_set0(
sig: <span class="kw-2">*mut </span>ffi::DSA_SIG,
r: <span class="kw-2">*mut </span>ffi::BIGNUM,
s: <span class="kw-2">*mut </span>ffi::BIGNUM,
) -&gt; c_int {
<span class="kw">if </span>r.is_null() || s.is_null() {
<span class="kw">return </span><span class="number">0</span>;
}
ffi::BN_clear_free((<span class="kw-2">*</span>sig).r);
ffi::BN_clear_free((<span class="kw-2">*</span>sig).s);
(<span class="kw-2">*</span>sig).r = r;
(<span class="kw-2">*</span>sig).s = s;
<span class="number">1
</span>}
<span class="attribute">#[allow(bad_style)]
</span><span class="kw">unsafe fn </span>DSA_SIG_get0(
sig: <span class="kw-2">*const </span>ffi::DSA_SIG,
pr: <span class="kw-2">*mut *const </span>ffi::BIGNUM,
ps: <span class="kw-2">*mut *const </span>ffi::BIGNUM)
{
<span class="kw">if </span>!pr.is_null() {
(<span class="kw-2">*</span>pr) = (<span class="kw-2">*</span>sig).r;
}
<span class="kw">if </span>!ps.is_null() {
(<span class="kw-2">*</span>ps) = (<span class="kw-2">*</span>sig).s;
}
}
}
}
<span class="attribute">#[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>::bn::BigNumContext;
<span class="attribute">#[cfg(not(boringssl))]
</span><span class="kw">use </span><span class="kw">crate</span>::hash::MessageDigest;
<span class="attribute">#[cfg(not(boringssl))]
</span><span class="kw">use </span><span class="kw">crate</span>::pkey::PKey;
<span class="attribute">#[cfg(not(boringssl))]
</span><span class="kw">use </span><span class="kw">crate</span>::sign::{Signer, Verifier};
<span class="attribute">#[test]
</span><span class="kw">pub fn </span>test_generate() {
Dsa::generate(<span class="number">1024</span>).unwrap();
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>test_pubkey_generation() {
<span class="kw">let </span>dsa = Dsa::generate(<span class="number">1024</span>).unwrap();
<span class="kw">let </span>p = dsa.p();
<span class="kw">let </span>g = dsa.g();
<span class="kw">let </span>priv_key = dsa.priv_key();
<span class="kw">let </span>pub_key = dsa.pub_key();
<span class="kw">let </span><span class="kw-2">mut </span>ctx = BigNumContext::new().unwrap();
<span class="kw">let </span><span class="kw-2">mut </span>calc = BigNum::new().unwrap();
calc.mod_exp(g, priv_key, p, <span class="kw-2">&amp;mut </span>ctx).unwrap();
<span class="macro">assert_eq!</span>(<span class="kw-2">&amp;</span>calc, pub_key)
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>test_priv_key_from_parts() {
<span class="kw">let </span>p = BigNum::from_u32(<span class="number">283</span>).unwrap();
<span class="kw">let </span>q = BigNum::from_u32(<span class="number">47</span>).unwrap();
<span class="kw">let </span>g = BigNum::from_u32(<span class="number">60</span>).unwrap();
<span class="kw">let </span>priv_key = BigNum::from_u32(<span class="number">15</span>).unwrap();
<span class="kw">let </span>pub_key = BigNum::from_u32(<span class="number">207</span>).unwrap();
<span class="kw">let </span>dsa = Dsa::from_private_components(p, q, g, priv_key, pub_key).unwrap();
<span class="macro">assert_eq!</span>(dsa.pub_key(), <span class="kw-2">&amp;</span>BigNum::from_u32(<span class="number">207</span>).unwrap());
<span class="macro">assert_eq!</span>(dsa.priv_key(), <span class="kw-2">&amp;</span>BigNum::from_u32(<span class="number">15</span>).unwrap());
<span class="macro">assert_eq!</span>(dsa.p(), <span class="kw-2">&amp;</span>BigNum::from_u32(<span class="number">283</span>).unwrap());
<span class="macro">assert_eq!</span>(dsa.q(), <span class="kw-2">&amp;</span>BigNum::from_u32(<span class="number">47</span>).unwrap());
<span class="macro">assert_eq!</span>(dsa.g(), <span class="kw-2">&amp;</span>BigNum::from_u32(<span class="number">60</span>).unwrap());
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>test_pub_key_from_parts() {
<span class="kw">let </span>p = BigNum::from_u32(<span class="number">283</span>).unwrap();
<span class="kw">let </span>q = BigNum::from_u32(<span class="number">47</span>).unwrap();
<span class="kw">let </span>g = BigNum::from_u32(<span class="number">60</span>).unwrap();
<span class="kw">let </span>pub_key = BigNum::from_u32(<span class="number">207</span>).unwrap();
<span class="kw">let </span>dsa = Dsa::from_public_components(p, q, g, pub_key).unwrap();
<span class="macro">assert_eq!</span>(dsa.pub_key(), <span class="kw-2">&amp;</span>BigNum::from_u32(<span class="number">207</span>).unwrap());
<span class="macro">assert_eq!</span>(dsa.p(), <span class="kw-2">&amp;</span>BigNum::from_u32(<span class="number">283</span>).unwrap());
<span class="macro">assert_eq!</span>(dsa.q(), <span class="kw-2">&amp;</span>BigNum::from_u32(<span class="number">47</span>).unwrap());
<span class="macro">assert_eq!</span>(dsa.g(), <span class="kw-2">&amp;</span>BigNum::from_u32(<span class="number">60</span>).unwrap());
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>test_params() {
<span class="kw">let </span>params = Dsa::generate_params(<span class="number">1024</span>).unwrap();
<span class="kw">let </span>p = params.p().to_owned().unwrap();
<span class="kw">let </span>q = params.q().to_owned().unwrap();
<span class="kw">let </span>g = params.g().to_owned().unwrap();
<span class="kw">let </span>key = params.generate_key().unwrap();
<span class="kw">let </span>params2 = Dsa::from_pqg(
key.p().to_owned().unwrap(),
key.q().to_owned().unwrap(),
key.g().to_owned().unwrap(),
)
.unwrap();
<span class="macro">assert_eq!</span>(p, <span class="kw-2">*</span>params2.p());
<span class="macro">assert_eq!</span>(q, <span class="kw-2">*</span>params2.q());
<span class="macro">assert_eq!</span>(g, <span class="kw-2">*</span>params2.g());
}
<span class="attribute">#[test]
#[cfg(not(boringssl))]
</span><span class="kw">fn </span>test_signature() {
<span class="kw">const </span>TEST_DATA: <span class="kw-2">&amp;</span>[u8] = <span class="kw-2">&amp;</span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">8</span>, <span class="number">9</span>];
<span class="kw">let </span>dsa_ref = Dsa::generate(<span class="number">1024</span>).unwrap();
<span class="kw">let </span>p = dsa_ref.p();
<span class="kw">let </span>q = dsa_ref.q();
<span class="kw">let </span>g = dsa_ref.g();
<span class="kw">let </span>pub_key = dsa_ref.pub_key();
<span class="kw">let </span>priv_key = dsa_ref.priv_key();
<span class="kw">let </span>priv_key = Dsa::from_private_components(
BigNumRef::to_owned(p).unwrap(),
BigNumRef::to_owned(q).unwrap(),
BigNumRef::to_owned(g).unwrap(),
BigNumRef::to_owned(priv_key).unwrap(),
BigNumRef::to_owned(pub_key).unwrap(),
)
.unwrap();
<span class="kw">let </span>priv_key = PKey::from_dsa(priv_key).unwrap();
<span class="kw">let </span>pub_key = Dsa::from_public_components(
BigNumRef::to_owned(p).unwrap(),
BigNumRef::to_owned(q).unwrap(),
BigNumRef::to_owned(g).unwrap(),
BigNumRef::to_owned(pub_key).unwrap(),
)
.unwrap();
<span class="kw">let </span>pub_key = PKey::from_dsa(pub_key).unwrap();
<span class="kw">let </span><span class="kw-2">mut </span>signer = Signer::new(MessageDigest::sha256(), <span class="kw-2">&amp;</span>priv_key).unwrap();
signer.update(TEST_DATA).unwrap();
<span class="kw">let </span>signature = signer.sign_to_vec().unwrap();
<span class="kw">let </span><span class="kw-2">mut </span>verifier = Verifier::new(MessageDigest::sha256(), <span class="kw-2">&amp;</span>pub_key).unwrap();
verifier.update(TEST_DATA).unwrap();
<span class="macro">assert!</span>(verifier.verify(<span class="kw-2">&amp;</span>signature[..]).unwrap());
}
<span class="attribute">#[test]
#[cfg(not(boringssl))]
</span><span class="kw">fn </span>test_signature_der() {
<span class="kw">use </span>std::convert::TryInto;
<span class="kw">const </span>TEST_DATA: <span class="kw-2">&amp;</span>[u8] = <span class="kw-2">&amp;</span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">8</span>, <span class="number">9</span>];
<span class="kw">let </span>dsa_ref = Dsa::generate(<span class="number">1024</span>).unwrap();
<span class="kw">let </span>pub_key: PKey&lt;<span class="kw">_</span>&gt; = dsa_ref.clone().try_into().unwrap();
<span class="kw">let </span>priv_key: PKey&lt;<span class="kw">_</span>&gt; = dsa_ref.try_into().unwrap();
<span class="kw">let </span><span class="kw-2">mut </span>signer = Signer::new(MessageDigest::sha256(), <span class="kw-2">&amp;</span>priv_key).unwrap();
signer.update(TEST_DATA).unwrap();
<span class="kw">let </span>signature = signer.sign_to_vec().unwrap();
<span class="macro">eprintln!</span>(<span class="string">&quot;{:?}&quot;</span>, signature);
<span class="kw">let </span>signature = DsaSig::from_der(<span class="kw-2">&amp;</span>signature).unwrap();
<span class="kw">let </span>r = BigNum::from_slice(<span class="kw-2">&amp;</span>signature.r().to_vec()).unwrap();
<span class="kw">let </span>s = BigNum::from_slice(<span class="kw-2">&amp;</span>signature.s().to_vec()).unwrap();
<span class="kw">let </span>signature = DsaSig::from_private_components(r, s).unwrap();
<span class="kw">let </span>signature = signature.to_der().unwrap();
<span class="kw">let </span><span class="kw-2">mut </span>verifier = Verifier::new(MessageDigest::sha256(), <span class="kw-2">&amp;</span>pub_key).unwrap();
verifier.update(TEST_DATA).unwrap();
<span class="macro">assert!</span>(verifier.verify(<span class="kw-2">&amp;</span>signature[..]).unwrap());
}
<span class="attribute">#[test]
#[allow(clippy::redundant_clone)]
</span><span class="kw">fn </span>clone() {
<span class="kw">let </span>key = Dsa::generate(<span class="number">2048</span>).unwrap();
drop(key.clone());
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>dsa_sig_debug() {
<span class="kw">let </span>sig = DsaSig::from_der(<span class="kw-2">&amp;</span>[
<span class="number">48</span>, <span class="number">46</span>, <span class="number">2</span>, <span class="number">21</span>, <span class="number">0</span>, <span class="number">135</span>, <span class="number">169</span>, <span class="number">24</span>, <span class="number">58</span>, <span class="number">153</span>, <span class="number">37</span>, <span class="number">175</span>, <span class="number">248</span>, <span class="number">200</span>, <span class="number">45</span>, <span class="number">251</span>, <span class="number">112</span>, <span class="number">238</span>, <span class="number">238</span>, <span class="number">89</span>,
<span class="number">172</span>, <span class="number">177</span>, <span class="number">182</span>, <span class="number">166</span>, <span class="number">237</span>, <span class="number">2</span>, <span class="number">21</span>, <span class="number">0</span>, <span class="number">159</span>, <span class="number">146</span>, <span class="number">151</span>, <span class="number">237</span>, <span class="number">187</span>, <span class="number">8</span>, <span class="number">82</span>, <span class="number">115</span>, <span class="number">14</span>, <span class="number">183</span>, <span class="number">103</span>,
<span class="number">12</span>, <span class="number">203</span>, <span class="number">46</span>, <span class="number">161</span>, <span class="number">208</span>, <span class="number">251</span>, <span class="number">167</span>, <span class="number">123</span>, <span class="number">131</span>,
])
.unwrap();
<span class="kw">let </span>s = <span class="macro">format!</span>(<span class="string">&quot;{:?}&quot;</span>, sig);
<span class="macro">assert_eq!</span>(s, <span class="string">&quot;DsaSig { r: 774484690634577222213819810519929266740561094381, s: 910998676210681457251421818099943952372231273347 }&quot;</span>);
}
}
</code></pre></div>
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