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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/encrypt.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>encrypt.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">//! Message encryption.
 //!
 //! The [`Encrypter`] allows for encryption of data given a public key. The [`Decrypter`] can be
 //! used with the corresponding private key to decrypt the data.
 //!
 //! # Examples
 //!
 //! Encrypt and decrypt data given an RSA keypair:
 //!
 //! ```rust
 //! use openssl::encrypt::{Encrypter, Decrypter};
 //! use openssl::rsa::{Rsa, Padding};
 //! use openssl::pkey::PKey;
 //!
 //! // Generate a keypair
 //! let keypair = Rsa::generate(2048).unwrap();
 //! let keypair = PKey::from_rsa(keypair).unwrap();
 //!
 //! let data = b&quot;hello, world!&quot;;
 //!
 //! // Encrypt the data with RSA PKCS1
 //! let mut encrypter = Encrypter::new(&amp;keypair).unwrap();
 //! encrypter.set_rsa_padding(Padding::PKCS1).unwrap();
 //! // Create an output buffer
 //! let buffer_len = encrypter.encrypt_len(data).unwrap();
 //! let mut encrypted = vec![0; buffer_len];
 //! // Encrypt and truncate the buffer
 //! let encrypted_len = encrypter.encrypt(data, &amp;mut encrypted).unwrap();
 //! encrypted.truncate(encrypted_len);
 //!
 //! // Decrypt the data
 //! let mut decrypter = Decrypter::new(&amp;keypair).unwrap();
 //! decrypter.set_rsa_padding(Padding::PKCS1).unwrap();
 //! // Create an output buffer
 //! let buffer_len = decrypter.decrypt_len(&amp;encrypted).unwrap();
 //! let mut decrypted = vec![0; buffer_len];
 //! // Encrypt and truncate the buffer
 //! let decrypted_len = decrypter.decrypt(&amp;encrypted, &amp;mut decrypted).unwrap();
 //! decrypted.truncate(decrypted_len);
 //! assert_eq!(&amp;*decrypted, data);
 //! ```
 </span><span class="attribute">#[cfg(any(ossl102, libressl310))]
 </span><span class="kw">use </span>libc::{c_int, c_void};
 <span class="kw">use </span>std::{marker::PhantomData, ptr};

 <span class="kw">use </span><span class="kw">crate</span>::error::ErrorStack;
 <span class="kw">use </span><span class="kw">crate</span>::hash::MessageDigest;
 <span class="kw">use </span><span class="kw">crate</span>::pkey::{HasPrivate, HasPublic, PKeyRef};
 <span class="kw">use </span><span class="kw">crate</span>::rsa::Padding;
 <span class="kw">use crate</span>::{cvt, cvt_p};
 <span class="kw">use </span>foreign_types::ForeignTypeRef;

 <span class="doccomment">/// A type which encrypts data.
 </span><span class="kw">pub struct </span>Encrypter&lt;<span class="lifetime">&#39;a</span>&gt; {
     pctx: <span class="kw-2">*mut </span>ffi::EVP_PKEY_CTX,
     _p: PhantomData&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>()&gt;,
 }

 <span class="kw">unsafe impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; Sync <span class="kw">for </span>Encrypter&lt;<span class="lifetime">&#39;a</span>&gt; {}
 <span class="kw">unsafe impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; Send <span class="kw">for </span>Encrypter&lt;<span class="lifetime">&#39;a</span>&gt; {}

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; Drop <span class="kw">for </span>Encrypter&lt;<span class="lifetime">&#39;a</span>&gt; {
     <span class="kw">fn </span>drop(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
         <span class="kw">unsafe </span>{
             ffi::EVP_PKEY_CTX_free(<span class="self">self</span>.pctx);
         }
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; Encrypter&lt;<span class="lifetime">&#39;a</span>&gt; {
     <span class="doccomment">/// Creates a new `Encrypter`.
     ///
     /// OpenSSL documentation at [`EVP_PKEY_encrypt_init`].
     ///
     /// [`EVP_PKEY_encrypt_init`]: https://www.openssl.org/docs/manmaster/man3/EVP_PKEY_encrypt_init.html
     </span><span class="kw">pub fn </span>new&lt;T&gt;(pkey: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>PKeyRef&lt;T&gt;) -&gt; <span class="prelude-ty">Result</span>&lt;Encrypter&lt;<span class="lifetime">&#39;a</span>&gt;, ErrorStack&gt;
     <span class="kw">where
         </span>T: HasPublic,
     {
         <span class="kw">unsafe </span>{
             ffi::init();

             <span class="kw">let </span>pctx = cvt_p(ffi::EVP_PKEY_CTX_new(pkey.as_ptr(), ptr::null_mut()))<span class="question-mark">?</span>;
             <span class="kw">let </span>r = ffi::EVP_PKEY_encrypt_init(pctx);
             <span class="kw">if </span>r != <span class="number">1 </span>{
                 ffi::EVP_PKEY_CTX_free(pctx);
                 <span class="kw">return </span><span class="prelude-val">Err</span>(ErrorStack::get());
             }

             <span class="prelude-val">Ok</span>(Encrypter {
                 pctx,
                 _p: PhantomData,
             })
         }
     }

     <span class="doccomment">/// Returns the RSA padding mode in use.
     ///
     /// This is only useful for RSA keys.
     ///
     /// This corresponds to `EVP_PKEY_CTX_get_rsa_padding`.
     </span><span class="kw">pub fn </span>rsa_padding(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;Padding, ErrorStack&gt; {
         <span class="kw">unsafe </span>{
             <span class="kw">let </span><span class="kw-2">mut </span>pad = <span class="number">0</span>;
             cvt(ffi::EVP_PKEY_CTX_get_rsa_padding(<span class="self">self</span>.pctx, <span class="kw-2">&amp;mut </span>pad))
                 .map(|<span class="kw">_</span>| Padding::from_raw(pad))
         }
     }

     <span class="doccomment">/// Sets the RSA padding mode.
     ///
     /// This is only useful for RSA keys.
     ///
     /// This corresponds to [`EVP_PKEY_CTX_set_rsa_padding`].
     ///
     /// [`EVP_PKEY_CTX_set_rsa_padding`]: https://www.openssl.org/docs/manmaster/crypto/EVP_PKEY_CTX_set_rsa_padding.html
     </span><span class="kw">pub fn </span>set_rsa_padding(<span class="kw-2">&amp;mut </span><span class="self">self</span>, padding: Padding) -&gt; <span class="prelude-ty">Result</span>&lt;(), ErrorStack&gt; {
         <span class="kw">unsafe </span>{
             cvt(ffi::EVP_PKEY_CTX_set_rsa_padding(
                 <span class="self">self</span>.pctx,
                 padding.as_raw(),
             ))
             .map(|<span class="kw">_</span>| ())
         }
     }

     <span class="doccomment">/// Sets the RSA MGF1 algorithm.
     ///
     /// This is only useful for RSA keys.
     ///
     /// This corresponds to [`EVP_PKEY_CTX_set_rsa_mgf1_md`].
     ///
     /// [`EVP_PKEY_CTX_set_rsa_mgf1_md`]: https://www.openssl.org/docs/manmaster/man7/RSA-PSS.html
     </span><span class="kw">pub fn </span>set_rsa_mgf1_md(<span class="kw-2">&amp;mut </span><span class="self">self</span>, md: MessageDigest) -&gt; <span class="prelude-ty">Result</span>&lt;(), ErrorStack&gt; {
         <span class="kw">unsafe </span>{
             cvt(ffi::EVP_PKEY_CTX_set_rsa_mgf1_md(
                 <span class="self">self</span>.pctx,
                 md.as_ptr() <span class="kw">as </span><span class="kw-2">*mut </span><span class="kw">_</span>,
             ))
             .map(|<span class="kw">_</span>| ())
         }
     }

     <span class="doccomment">/// Sets the RSA OAEP algorithm.
     ///
     /// This is only useful for RSA keys.
     ///
     /// This corresponds to [`EVP_PKEY_CTX_set_rsa_oaep_md`].
     ///
     /// [`EVP_PKEY_CTX_set_rsa_oaep_md`]: https://www.openssl.org/docs/manmaster/man3/EVP_PKEY_CTX_set_rsa_oaep_md.html
     </span><span class="attribute">#[cfg(any(ossl102, libressl310))]
     </span><span class="kw">pub fn </span>set_rsa_oaep_md(<span class="kw-2">&amp;mut </span><span class="self">self</span>, md: MessageDigest) -&gt; <span class="prelude-ty">Result</span>&lt;(), ErrorStack&gt; {
         <span class="kw">unsafe </span>{
             cvt(ffi::EVP_PKEY_CTX_set_rsa_oaep_md(
                 <span class="self">self</span>.pctx,
                 md.as_ptr() <span class="kw">as </span><span class="kw-2">*mut </span><span class="kw">_</span>,
             ))
             .map(|<span class="kw">_</span>| ())
         }
     }

     <span class="doccomment">/// Sets the RSA OAEP label.
     ///
     /// This is only useful for RSA keys.
     ///
     /// This corresponds to [`EVP_PKEY_CTX_set0_rsa_oaep_label`].
     ///
     /// [`EVP_PKEY_CTX_set0_rsa_oaep_label`]: https://www.openssl.org/docs/manmaster/man3/EVP_PKEY_CTX_set0_rsa_oaep_label.html
     </span><span class="attribute">#[cfg(any(ossl102, libressl310))]
     </span><span class="kw">pub fn </span>set_rsa_oaep_label(<span class="kw-2">&amp;mut </span><span class="self">self</span>, label: <span class="kw-2">&amp;</span>[u8]) -&gt; <span class="prelude-ty">Result</span>&lt;(), ErrorStack&gt; {
         <span class="kw">unsafe </span>{
             <span class="kw">let </span>p = cvt_p(ffi::OPENSSL_malloc(label.len() <span class="kw">as _</span>))<span class="question-mark">?</span>;
             ptr::copy_nonoverlapping(label.as_ptr(), p <span class="kw">as </span><span class="kw-2">*mut </span>u8, label.len());

             cvt(ffi::EVP_PKEY_CTX_set0_rsa_oaep_label(
                 <span class="self">self</span>.pctx,
                 p <span class="kw">as </span><span class="kw-2">*mut </span>c_void,
                 label.len() <span class="kw">as </span>c_int,
             ))
             .map(|<span class="kw">_</span>| ())
             .map_err(|e| {
                 ffi::OPENSSL_free(p);
                 e
             })
         }
     }

     <span class="doccomment">/// Performs public key encryption.
     ///
     /// In order to know the size needed for the output buffer, use [`encrypt_len`](Encrypter::encrypt_len).
     /// Note that the length of the output buffer can be greater of the length of the encoded data.
     /// ```
     /// # use openssl::{
     /// #   encrypt::Encrypter,
     /// #   pkey::PKey,
     /// #   rsa::{Rsa, Padding},
     /// # };
     /// #
     /// # let key = include_bytes!(&quot;../test/rsa.pem&quot;);
     /// # let private_key = Rsa::private_key_from_pem(key).unwrap();
     /// # let pkey = PKey::from_rsa(private_key).unwrap();
     /// # let input = b&quot;hello world&quot;.to_vec();
     /// #
     /// let mut encrypter = Encrypter::new(&amp;pkey).unwrap();
     /// encrypter.set_rsa_padding(Padding::PKCS1).unwrap();
     ///
     /// // Get the length of the output buffer
     /// let buffer_len = encrypter.encrypt_len(&amp;input).unwrap();
     /// let mut encoded = vec![0u8; buffer_len];
     ///
     /// // Encode the data and get its length
     /// let encoded_len = encrypter.encrypt(&amp;input, &amp;mut encoded).unwrap();
     ///
     /// // Use only the part of the buffer with the encoded data
     /// let encoded = &amp;encoded[..encoded_len];
     /// ```
     ///
     /// This corresponds to [`EVP_PKEY_encrypt`].
     ///
     /// [`EVP_PKEY_encrypt`]: https://www.openssl.org/docs/manmaster/man3/EVP_PKEY_encrypt.html
     </span><span class="kw">pub fn </span>encrypt(<span class="kw-2">&amp;</span><span class="self">self</span>, from: <span class="kw-2">&amp;</span>[u8], to: <span class="kw-2">&amp;mut </span>[u8]) -&gt; <span class="prelude-ty">Result</span>&lt;usize, ErrorStack&gt; {
         <span class="kw">let </span><span class="kw-2">mut </span>written = to.len();
         <span class="kw">unsafe </span>{
             cvt(ffi::EVP_PKEY_encrypt(
                 <span class="self">self</span>.pctx,
                 to.as_mut_ptr(),
                 <span class="kw-2">&amp;mut </span>written,
                 from.as_ptr(),
                 from.len(),
             ))<span class="question-mark">?</span>;
         }

         <span class="prelude-val">Ok</span>(written)
     }

     <span class="doccomment">/// Gets the size of the buffer needed to encrypt the input data.
     ///
     /// This corresponds to [`EVP_PKEY_encrypt`] called with a null pointer as output argument.
     ///
     /// [`EVP_PKEY_encrypt`]: https://www.openssl.org/docs/manmaster/man3/EVP_PKEY_encrypt.html
     </span><span class="kw">pub fn </span>encrypt_len(<span class="kw-2">&amp;</span><span class="self">self</span>, from: <span class="kw-2">&amp;</span>[u8]) -&gt; <span class="prelude-ty">Result</span>&lt;usize, ErrorStack&gt; {
         <span class="kw">let </span><span class="kw-2">mut </span>written = <span class="number">0</span>;
         <span class="kw">unsafe </span>{
             cvt(ffi::EVP_PKEY_encrypt(
                 <span class="self">self</span>.pctx,
                 ptr::null_mut(),
                 <span class="kw-2">&amp;mut </span>written,
                 from.as_ptr(),
                 from.len(),
             ))<span class="question-mark">?</span>;
         }

         <span class="prelude-val">Ok</span>(written)
     }
 }

 <span class="doccomment">/// A type which decrypts data.
 </span><span class="kw">pub struct </span>Decrypter&lt;<span class="lifetime">&#39;a</span>&gt; {
     pctx: <span class="kw-2">*mut </span>ffi::EVP_PKEY_CTX,
     _p: PhantomData&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>()&gt;,
 }

 <span class="kw">unsafe impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; Sync <span class="kw">for </span>Decrypter&lt;<span class="lifetime">&#39;a</span>&gt; {}
 <span class="kw">unsafe impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; Send <span class="kw">for </span>Decrypter&lt;<span class="lifetime">&#39;a</span>&gt; {}

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; Drop <span class="kw">for </span>Decrypter&lt;<span class="lifetime">&#39;a</span>&gt; {
     <span class="kw">fn </span>drop(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
         <span class="kw">unsafe </span>{
             ffi::EVP_PKEY_CTX_free(<span class="self">self</span>.pctx);
         }
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; Decrypter&lt;<span class="lifetime">&#39;a</span>&gt; {
     <span class="doccomment">/// Creates a new `Decrypter`.
     ///
     /// OpenSSL documentation at [`EVP_PKEY_decrypt_init`].
     ///
     /// [`EVP_PKEY_decrypt_init`]: https://www.openssl.org/docs/manmaster/man3/EVP_PKEY_decrypt_init.html
     </span><span class="kw">pub fn </span>new&lt;T&gt;(pkey: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>PKeyRef&lt;T&gt;) -&gt; <span class="prelude-ty">Result</span>&lt;Decrypter&lt;<span class="lifetime">&#39;a</span>&gt;, ErrorStack&gt;
     <span class="kw">where
         </span>T: HasPrivate,
     {
         <span class="kw">unsafe </span>{
             ffi::init();

             <span class="kw">let </span>pctx = cvt_p(ffi::EVP_PKEY_CTX_new(pkey.as_ptr(), ptr::null_mut()))<span class="question-mark">?</span>;
             <span class="kw">let </span>r = ffi::EVP_PKEY_decrypt_init(pctx);
             <span class="kw">if </span>r != <span class="number">1 </span>{
                 ffi::EVP_PKEY_CTX_free(pctx);
                 <span class="kw">return </span><span class="prelude-val">Err</span>(ErrorStack::get());
             }

             <span class="prelude-val">Ok</span>(Decrypter {
                 pctx,
                 _p: PhantomData,
             })
         }
     }

     <span class="doccomment">/// Returns the RSA padding mode in use.
     ///
     /// This is only useful for RSA keys.
     ///
     /// This corresponds to `EVP_PKEY_CTX_get_rsa_padding`.
     </span><span class="kw">pub fn </span>rsa_padding(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;Padding, ErrorStack&gt; {
         <span class="kw">unsafe </span>{
             <span class="kw">let </span><span class="kw-2">mut </span>pad = <span class="number">0</span>;
             cvt(ffi::EVP_PKEY_CTX_get_rsa_padding(<span class="self">self</span>.pctx, <span class="kw-2">&amp;mut </span>pad))
                 .map(|<span class="kw">_</span>| Padding::from_raw(pad))
         }
     }

     <span class="doccomment">/// Sets the RSA padding mode.
     ///
     /// This is only useful for RSA keys.
     ///
     /// This corresponds to [`EVP_PKEY_CTX_set_rsa_padding`].
     ///
     /// [`EVP_PKEY_CTX_set_rsa_padding`]: https://www.openssl.org/docs/manmaster/crypto/EVP_PKEY_CTX_set_rsa_padding.html
     </span><span class="kw">pub fn </span>set_rsa_padding(<span class="kw-2">&amp;mut </span><span class="self">self</span>, padding: Padding) -&gt; <span class="prelude-ty">Result</span>&lt;(), ErrorStack&gt; {
         <span class="kw">unsafe </span>{
             cvt(ffi::EVP_PKEY_CTX_set_rsa_padding(
                 <span class="self">self</span>.pctx,
                 padding.as_raw(),
             ))
             .map(|<span class="kw">_</span>| ())
         }
     }

     <span class="doccomment">/// Sets the RSA MGF1 algorithm.
     ///
     /// This is only useful for RSA keys.
     ///
     /// This corresponds to [`EVP_PKEY_CTX_set_rsa_mgf1_md`].
     ///
     /// [`EVP_PKEY_CTX_set_rsa_mgf1_md`]: https://www.openssl.org/docs/manmaster/man7/RSA-PSS.html
     </span><span class="kw">pub fn </span>set_rsa_mgf1_md(<span class="kw-2">&amp;mut </span><span class="self">self</span>, md: MessageDigest) -&gt; <span class="prelude-ty">Result</span>&lt;(), ErrorStack&gt; {
         <span class="kw">unsafe </span>{
             cvt(ffi::EVP_PKEY_CTX_set_rsa_mgf1_md(
                 <span class="self">self</span>.pctx,
                 md.as_ptr() <span class="kw">as </span><span class="kw-2">*mut </span><span class="kw">_</span>,
             ))
             .map(|<span class="kw">_</span>| ())
         }
     }

     <span class="doccomment">/// Sets the RSA OAEP algorithm.
     ///
     /// This is only useful for RSA keys.
     ///
     /// This corresponds to [`EVP_PKEY_CTX_set_rsa_oaep_md`].
     ///
     /// [`EVP_PKEY_CTX_set_rsa_oaep_md`]: https://www.openssl.org/docs/manmaster/man3/EVP_PKEY_CTX_set_rsa_oaep_md.html
     </span><span class="attribute">#[cfg(any(ossl102, libressl310))]
     </span><span class="kw">pub fn </span>set_rsa_oaep_md(<span class="kw-2">&amp;mut </span><span class="self">self</span>, md: MessageDigest) -&gt; <span class="prelude-ty">Result</span>&lt;(), ErrorStack&gt; {
         <span class="kw">unsafe </span>{
             cvt(ffi::EVP_PKEY_CTX_set_rsa_oaep_md(
                 <span class="self">self</span>.pctx,
                 md.as_ptr() <span class="kw">as </span><span class="kw-2">*mut </span><span class="kw">_</span>,
             ))
             .map(|<span class="kw">_</span>| ())
         }
     }

     <span class="doccomment">/// Sets the RSA OAEP label.
     ///
     /// This is only useful for RSA keys.
     ///
     /// This corresponds to [`EVP_PKEY_CTX_set0_rsa_oaep_label`].
     ///
     /// [`EVP_PKEY_CTX_set0_rsa_oaep_label`]: https://www.openssl.org/docs/manmaster/man3/EVP_PKEY_CTX_set0_rsa_oaep_label.html
     </span><span class="attribute">#[cfg(any(ossl102, libressl310))]
     </span><span class="kw">pub fn </span>set_rsa_oaep_label(<span class="kw-2">&amp;mut </span><span class="self">self</span>, label: <span class="kw-2">&amp;</span>[u8]) -&gt; <span class="prelude-ty">Result</span>&lt;(), ErrorStack&gt; {
         <span class="kw">unsafe </span>{
             <span class="kw">let </span>p = cvt_p(ffi::OPENSSL_malloc(label.len() <span class="kw">as _</span>))<span class="question-mark">?</span>;
             ptr::copy_nonoverlapping(label.as_ptr(), p <span class="kw">as </span><span class="kw-2">*mut </span>u8, label.len());

             cvt(ffi::EVP_PKEY_CTX_set0_rsa_oaep_label(
                 <span class="self">self</span>.pctx,
                 p <span class="kw">as </span><span class="kw-2">*mut </span>c_void,
                 label.len() <span class="kw">as </span>c_int,
             ))
             .map(|<span class="kw">_</span>| ())
             .map_err(|e| {
                 ffi::OPENSSL_free(p);
                 e
             })
         }
     }

     <span class="doccomment">/// Performs public key decryption.
     ///
     /// In order to know the size needed for the output buffer, use [`decrypt_len`](Decrypter::decrypt_len).
     /// Note that the length of the output buffer can be greater of the length of the decoded data.
     /// ```
     /// # use openssl::{
     /// #   encrypt::Decrypter,
     /// #   pkey::PKey,
     /// #   rsa::{Rsa, Padding},
     /// # };
     /// #
     /// # const INPUT: &amp;[u8] = b&quot;\
     /// #     \x26\xa1\xc1\x13\xc5\x7f\xb4\x9f\xa0\xb4\xde\x61\x5e\x2e\xc6\xfb\x76\x5c\xd1\x2b\x5f\
     /// #     \x1d\x36\x60\xfa\xf8\xe8\xb3\x21\xf4\x9c\x70\xbc\x03\xea\xea\xac\xce\x4b\xb3\xf6\x45\
     /// #     \xcc\xb3\x80\x9e\xa8\xf7\xc3\x5d\x06\x12\x7a\xa3\x0c\x30\x67\xf1\xe7\x94\x6c\xf6\x26\
     /// #     \xac\x28\x17\x59\x69\xe1\xdc\xed\x7e\xc0\xe9\x62\x57\x49\xce\xdd\x13\x07\xde\x18\x03\
     /// #     \x0f\x9d\x61\x65\xb9\x23\x8c\x78\x4b\xad\x23\x49\x75\x47\x64\xa0\xa0\xa2\x90\xc1\x49\
     /// #     \x1b\x05\x24\xc2\xe9\x2c\x0d\x49\x78\x72\x61\x72\xed\x8b\x6f\x8a\xe8\xca\x05\x5c\x58\
     /// #     \xd6\x95\xd6\x7b\xe3\x2d\x0d\xaa\x3e\x6d\x3c\x9a\x1c\x1d\xb4\x6c\x42\x9d\x9a\x82\x55\
     /// #     \xd9\xde\xc8\x08\x7b\x17\xac\xd7\xaf\x86\x7b\x69\x9e\x3c\xf4\x5e\x1c\x39\x52\x6d\x62\
     /// #     \x50\x51\xbd\xa6\xc8\x4e\xe9\x34\xf0\x37\x0d\xa9\xa9\x77\xe6\xf5\xc2\x47\x2d\xa8\xee\
     /// #     \x3f\x69\x78\xff\xa9\xdc\x70\x22\x20\x9a\x5c\x9b\x70\x15\x90\xd3\xb4\x0e\x54\x9e\x48\
     /// #     \xed\xb6\x2c\x88\xfc\xb4\xa9\x37\x10\xfa\x71\xb2\xec\x75\xe7\xe7\x0e\xf4\x60\x2c\x7b\
     /// #     \x58\xaf\xa0\x53\xbd\x24\xf1\x12\xe3\x2e\x99\x25\x0a\x54\x54\x9d\xa1\xdb\xca\x41\x85\
     /// #     \xf4\x62\x78\x64&quot;;
     /// #
     /// # let key = include_bytes!(&quot;../test/rsa.pem&quot;);
     /// # let private_key = Rsa::private_key_from_pem(key).unwrap();
     /// # let pkey = PKey::from_rsa(private_key).unwrap();
     /// # let input = INPUT.to_vec();
     /// #
     /// let mut decrypter = Decrypter::new(&amp;pkey).unwrap();
     /// decrypter.set_rsa_padding(Padding::PKCS1).unwrap();
     ///
     /// // Get the length of the output buffer
     /// let buffer_len = decrypter.decrypt_len(&amp;input).unwrap();
     /// let mut decoded = vec![0u8; buffer_len];
     ///
     /// // Decrypt the data and get its length
     /// let decoded_len = decrypter.decrypt(&amp;input, &amp;mut decoded).unwrap();
     ///
     /// // Use only the part of the buffer with the decrypted data
     /// let decoded = &amp;decoded[..decoded_len];
     /// ```
     ///
     /// This corresponds to [`EVP_PKEY_decrypt`].
     ///
     /// [`EVP_PKEY_decrypt`]: https://www.openssl.org/docs/manmaster/man3/EVP_PKEY_decrypt.html
     </span><span class="kw">pub fn </span>decrypt(<span class="kw-2">&amp;</span><span class="self">self</span>, from: <span class="kw-2">&amp;</span>[u8], to: <span class="kw-2">&amp;mut </span>[u8]) -&gt; <span class="prelude-ty">Result</span>&lt;usize, ErrorStack&gt; {
         <span class="kw">let </span><span class="kw-2">mut </span>written = to.len();
         <span class="kw">unsafe </span>{
             cvt(ffi::EVP_PKEY_decrypt(
                 <span class="self">self</span>.pctx,
                 to.as_mut_ptr(),
                 <span class="kw-2">&amp;mut </span>written,
                 from.as_ptr(),
                 from.len(),
             ))<span class="question-mark">?</span>;
         }

         <span class="prelude-val">Ok</span>(written)
     }

     <span class="doccomment">/// Gets the size of the buffer needed to decrypt the input data.
     ///
     /// This corresponds to [`EVP_PKEY_decrypt`] called with a null pointer as output argument.
     ///
     /// [`EVP_PKEY_decrypt`]: https://www.openssl.org/docs/manmaster/man3/EVP_PKEY_decrypt.html
     </span><span class="kw">pub fn </span>decrypt_len(<span class="kw-2">&amp;</span><span class="self">self</span>, from: <span class="kw-2">&amp;</span>[u8]) -&gt; <span class="prelude-ty">Result</span>&lt;usize, ErrorStack&gt; {
         <span class="kw">let </span><span class="kw-2">mut </span>written = <span class="number">0</span>;
         <span class="kw">unsafe </span>{
             cvt(ffi::EVP_PKEY_decrypt(
                 <span class="self">self</span>.pctx,
                 ptr::null_mut(),
                 <span class="kw-2">&amp;mut </span>written,
                 from.as_ptr(),
                 from.len(),
             ))<span class="question-mark">?</span>;
         }

         <span class="prelude-val">Ok</span>(written)
     }
 }

 <span class="attribute">#[cfg(test)]
 </span><span class="kw">mod </span>test {
     <span class="kw">use </span>hex::FromHex;

     <span class="kw">use </span><span class="kw">crate</span>::encrypt::{Decrypter, Encrypter};
     <span class="attribute">#[cfg(any(ossl102, libressl310))]
     </span><span class="kw">use </span><span class="kw">crate</span>::hash::MessageDigest;
     <span class="kw">use </span><span class="kw">crate</span>::pkey::PKey;
     <span class="kw">use </span><span class="kw">crate</span>::rsa::{Padding, Rsa};

     <span class="kw">const </span>INPUT: <span class="kw-2">&amp;</span>str =
         <span class="string">&quot;65794a68624763694f694a53557a49314e694a392e65794a7063334d694f694a71623255694c41304b49434a6c\
          654841694f6a457a4d4441344d546b7a4f44417344516f67496d6830644841364c79396c654746746347786c4c\
          6d4e76625339706331397962323930496a7030636e566c6651&quot;</span>;

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>rsa_encrypt_decrypt() {
         <span class="kw">let </span>key = <span class="macro">include_bytes!</span>(<span class="string">&quot;../test/rsa.pem&quot;</span>);
         <span class="kw">let </span>private_key = Rsa::private_key_from_pem(key).unwrap();
         <span class="kw">let </span>pkey = PKey::from_rsa(private_key).unwrap();

         <span class="kw">let </span><span class="kw-2">mut </span>encrypter = Encrypter::new(<span class="kw-2">&amp;</span>pkey).unwrap();
         encrypter.set_rsa_padding(Padding::PKCS1).unwrap();
         <span class="kw">let </span>input = Vec::from_hex(INPUT).unwrap();
         <span class="kw">let </span>buffer_len = encrypter.encrypt_len(<span class="kw-2">&amp;</span>input).unwrap();
         <span class="kw">let </span><span class="kw-2">mut </span>encoded = <span class="macro">vec!</span>[<span class="number">0u8</span>; buffer_len];
         <span class="kw">let </span>encoded_len = encrypter.encrypt(<span class="kw-2">&amp;</span>input, <span class="kw-2">&amp;mut </span>encoded).unwrap();
         <span class="kw">let </span>encoded = <span class="kw-2">&amp;</span>encoded[..encoded_len];

         <span class="kw">let </span><span class="kw-2">mut </span>decrypter = Decrypter::new(<span class="kw-2">&amp;</span>pkey).unwrap();
         decrypter.set_rsa_padding(Padding::PKCS1).unwrap();
         <span class="kw">let </span>buffer_len = decrypter.decrypt_len(encoded).unwrap();
         <span class="kw">let </span><span class="kw-2">mut </span>decoded = <span class="macro">vec!</span>[<span class="number">0u8</span>; buffer_len];
         <span class="kw">let </span>decoded_len = decrypter.decrypt(encoded, <span class="kw-2">&amp;mut </span>decoded).unwrap();
         <span class="kw">let </span>decoded = <span class="kw-2">&amp;</span>decoded[..decoded_len];

         <span class="macro">assert_eq!</span>(decoded, <span class="kw-2">&amp;*</span>input);
     }

     <span class="attribute">#[test]
     #[cfg(any(ossl102, libressl310))]
     </span><span class="kw">fn </span>rsa_encrypt_decrypt_with_sha256() {
         <span class="kw">let </span>key = <span class="macro">include_bytes!</span>(<span class="string">&quot;../test/rsa.pem&quot;</span>);
         <span class="kw">let </span>private_key = Rsa::private_key_from_pem(key).unwrap();
         <span class="kw">let </span>pkey = PKey::from_rsa(private_key).unwrap();

         <span class="kw">let </span>md = MessageDigest::sha256();

         <span class="kw">let </span><span class="kw-2">mut </span>encrypter = Encrypter::new(<span class="kw-2">&amp;</span>pkey).unwrap();
         encrypter.set_rsa_padding(Padding::PKCS1_OAEP).unwrap();
         encrypter.set_rsa_oaep_md(md).unwrap();
         encrypter.set_rsa_mgf1_md(md).unwrap();
         <span class="kw">let </span>input = Vec::from_hex(INPUT).unwrap();
         <span class="kw">let </span>buffer_len = encrypter.encrypt_len(<span class="kw-2">&amp;</span>input).unwrap();
         <span class="kw">let </span><span class="kw-2">mut </span>encoded = <span class="macro">vec!</span>[<span class="number">0u8</span>; buffer_len];
         <span class="kw">let </span>encoded_len = encrypter.encrypt(<span class="kw-2">&amp;</span>input, <span class="kw-2">&amp;mut </span>encoded).unwrap();
         <span class="kw">let </span>encoded = <span class="kw-2">&amp;</span>encoded[..encoded_len];

         <span class="kw">let </span><span class="kw-2">mut </span>decrypter = Decrypter::new(<span class="kw-2">&amp;</span>pkey).unwrap();
         decrypter.set_rsa_padding(Padding::PKCS1_OAEP).unwrap();
         decrypter.set_rsa_oaep_md(md).unwrap();
         decrypter.set_rsa_mgf1_md(md).unwrap();
         <span class="kw">let </span>buffer_len = decrypter.decrypt_len(encoded).unwrap();
         <span class="kw">let </span><span class="kw-2">mut </span>decoded = <span class="macro">vec!</span>[<span class="number">0u8</span>; buffer_len];
         <span class="kw">let </span>decoded_len = decrypter.decrypt(encoded, <span class="kw-2">&amp;mut </span>decoded).unwrap();
         <span class="kw">let </span>decoded = <span class="kw-2">&amp;</span>decoded[..decoded_len];

         <span class="macro">assert_eq!</span>(decoded, <span class="kw-2">&amp;*</span>input);
     }

     <span class="attribute">#[test]
     #[cfg(any(ossl102, libressl310))]
     </span><span class="kw">fn </span>rsa_encrypt_decrypt_oaep_label() {
         <span class="kw">let </span>key = <span class="macro">include_bytes!</span>(<span class="string">&quot;../test/rsa.pem&quot;</span>);
         <span class="kw">let </span>private_key = Rsa::private_key_from_pem(key).unwrap();
         <span class="kw">let </span>pkey = PKey::from_rsa(private_key).unwrap();

         <span class="kw">let </span><span class="kw-2">mut </span>encrypter = Encrypter::new(<span class="kw-2">&amp;</span>pkey).unwrap();
         encrypter.set_rsa_padding(Padding::PKCS1_OAEP).unwrap();
         encrypter.set_rsa_oaep_label(<span class="string">b&quot;test_oaep_label&quot;</span>).unwrap();
         <span class="kw">let </span>input = Vec::from_hex(INPUT).unwrap();
         <span class="kw">let </span>buffer_len = encrypter.encrypt_len(<span class="kw-2">&amp;</span>input).unwrap();
         <span class="kw">let </span><span class="kw-2">mut </span>encoded = <span class="macro">vec!</span>[<span class="number">0u8</span>; buffer_len];
         <span class="kw">let </span>encoded_len = encrypter.encrypt(<span class="kw-2">&amp;</span>input, <span class="kw-2">&amp;mut </span>encoded).unwrap();
         <span class="kw">let </span>encoded = <span class="kw-2">&amp;</span>encoded[..encoded_len];

         <span class="kw">let </span><span class="kw-2">mut </span>decrypter = Decrypter::new(<span class="kw-2">&amp;</span>pkey).unwrap();
         decrypter.set_rsa_padding(Padding::PKCS1_OAEP).unwrap();
         decrypter.set_rsa_oaep_label(<span class="string">b&quot;test_oaep_label&quot;</span>).unwrap();
         <span class="kw">let </span>buffer_len = decrypter.decrypt_len(encoded).unwrap();
         <span class="kw">let </span><span class="kw-2">mut </span>decoded = <span class="macro">vec!</span>[<span class="number">0u8</span>; buffer_len];
         <span class="kw">let </span>decoded_len = decrypter.decrypt(encoded, <span class="kw-2">&amp;mut </span>decoded).unwrap();
         <span class="kw">let </span>decoded = <span class="kw-2">&amp;</span>decoded[..decoded_len];

         <span class="macro">assert_eq!</span>(decoded, <span class="kw-2">&amp;*</span>input);

         decrypter.set_rsa_oaep_label(<span class="string">b&quot;wrong_oaep_label&quot;</span>).unwrap();
         <span class="kw">let </span>buffer_len = decrypter.decrypt_len(encoded).unwrap();
         <span class="kw">let </span><span class="kw-2">mut </span>decoded = <span class="macro">vec!</span>[<span class="number">0u8</span>; buffer_len];

         <span class="macro">assert!</span>(decrypter.decrypt(encoded, <span class="kw-2">&amp;mut </span>decoded).is_err());
     }
 }
 </code></pre></div>
 </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="openssl" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html>