| <!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/cipher_ctx.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>cipher_ctx.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">//! The symmetric encryption context. |
| //! |
| //! # Examples |
| //! |
| //! Encrypt data with AES128 CBC |
| //! |
| //! ``` |
| //! use openssl::cipher::Cipher; |
| //! use openssl::cipher_ctx::CipherCtx; |
| //! |
| //! let cipher = Cipher::aes_128_cbc(); |
| //! let data = b"Some Crypto Text"; |
| //! let key = b"\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0A\x0B\x0C\x0D\x0E\x0F"; |
| //! let iv = b"\x00\x01\x02\x03\x04\x05\x06\x07\x00\x01\x02\x03\x04\x05\x06\x07"; |
| //! |
| //! let mut ctx = CipherCtx::new().unwrap(); |
| //! ctx.encrypt_init(Some(cipher), Some(key), Some(iv)).unwrap(); |
| //! |
| //! let mut ciphertext = vec![]; |
| //! ctx.cipher_update_vec(data, &mut ciphertext).unwrap(); |
| //! ctx.cipher_final_vec(&mut ciphertext).unwrap(); |
| //! |
| //! assert_eq!( |
| //! b"\xB4\xB9\xE7\x30\xD6\xD6\xF7\xDE\x77\x3F\x1C\xFF\xB3\x3E\x44\x5A\x91\xD7\x27\x62\x87\x4D\ |
| //! \xFB\x3C\x5E\xC4\x59\x72\x4A\xF4\x7C\xA1", |
| //! &ciphertext[..], |
| //! ); |
| //! ``` |
| //! |
| //! Decrypt data with AES128 CBC |
| //! |
| //! ``` |
| //! use openssl::cipher::Cipher; |
| //! use openssl::cipher_ctx::CipherCtx; |
| //! |
| //! let cipher = Cipher::aes_128_cbc(); |
| //! let data = b"\xB4\xB9\xE7\x30\xD6\xD6\xF7\xDE\x77\x3F\x1C\xFF\xB3\x3E\x44\x5A\x91\xD7\x27\x62\ |
| //! \x87\x4D\xFB\x3C\x5E\xC4\x59\x72\x4A\xF4\x7C\xA1"; |
| //! let key = b"\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0A\x0B\x0C\x0D\x0E\x0F"; |
| //! let iv = b"\x00\x01\x02\x03\x04\x05\x06\x07\x00\x01\x02\x03\x04\x05\x06\x07"; |
| //! |
| //! let mut ctx = CipherCtx::new().unwrap(); |
| //! ctx.decrypt_init(Some(cipher), Some(key), Some(iv)).unwrap(); |
| //! |
| //! let mut plaintext = vec![]; |
| //! ctx.cipher_update_vec(data, &mut plaintext).unwrap(); |
| //! ctx.cipher_final_vec(&mut plaintext).unwrap(); |
| //! |
| //! assert_eq!(b"Some Crypto Text", &plaintext[..]); |
| //! ``` |
| </span><span class="attribute">#![warn(missing_docs)] |
| |
| </span><span class="kw">use </span><span class="kw">crate</span>::cipher::CipherRef; |
| <span class="kw">use </span><span class="kw">crate</span>::error::ErrorStack; |
| <span class="attribute">#[cfg(not(boringssl))] |
| </span><span class="kw">use </span><span class="kw">crate</span>::pkey::{HasPrivate, HasPublic, PKey, PKeyRef}; |
| <span class="kw">use crate</span>::{cvt, cvt_p}; |
| <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, c_uchar}; |
| <span class="kw">use </span>openssl_macros::corresponds; |
| <span class="kw">use </span>std::convert::{TryFrom, TryInto}; |
| <span class="kw">use </span>std::ptr; |
| |
| <span class="macro">cfg_if! </span>{ |
| <span class="kw">if </span><span class="attribute">#[cfg(ossl300)] </span>{ |
| <span class="kw">use </span>ffi::EVP_CIPHER_CTX_get0_cipher; |
| } <span class="kw">else </span>{ |
| <span class="kw">use </span>ffi::EVP_CIPHER_CTX_cipher <span class="kw">as </span>EVP_CIPHER_CTX_get0_cipher; |
| } |
| } |
| |
| <span class="macro">foreign_type_and_impl_send_sync! </span>{ |
| <span class="kw">type </span>CType = ffi::EVP_CIPHER_CTX; |
| <span class="kw">fn </span>drop = ffi::EVP_CIPHER_CTX_free; |
| |
| <span class="doccomment">/// A context object used to perform symmetric encryption operations. |
| </span><span class="kw">pub struct </span>CipherCtx; |
| <span class="doccomment">/// A reference to a [`CipherCtx`]. |
| </span><span class="kw">pub struct </span>CipherCtxRef; |
| } |
| |
| <span class="kw">impl </span>CipherCtx { |
| <span class="doccomment">/// Creates a new context. |
| </span><span class="attribute">#[corresponds(EVP_CIPHER_CTX_new)] |
| </span><span class="kw">pub fn </span>new() -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, ErrorStack> { |
| ffi::init(); |
| |
| <span class="kw">unsafe </span>{ |
| <span class="kw">let </span>ptr = cvt_p(ffi::EVP_CIPHER_CTX_new())<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(CipherCtx::from_ptr(ptr)) |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>CipherCtxRef { |
| <span class="doccomment">/// Initializes the context for encryption. |
| /// |
| /// Normally this is called once to set all of the cipher, key, and IV. However, this process can be split up |
| /// by first setting the cipher with no key or IV and then setting the key and IV with no cipher. This can be used |
| /// to, for example, use a nonstandard IV size. |
| /// |
| /// # Panics |
| /// |
| /// Panics if the key buffer is smaller than the key size of the cipher, the IV buffer is smaller than the IV size |
| /// of the cipher, or if a key or IV is provided before a cipher. |
| </span><span class="attribute">#[corresponds(EVP_EncryptInit_ex)] |
| </span><span class="kw">pub fn </span>encrypt_init( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| type_: <span class="prelude-ty">Option</span><<span class="kw-2">&</span>CipherRef>, |
| key: <span class="prelude-ty">Option</span><<span class="kw-2">&</span>[u8]>, |
| iv: <span class="prelude-ty">Option</span><<span class="kw-2">&</span>[u8]>, |
| ) -> <span class="prelude-ty">Result</span><(), ErrorStack> { |
| <span class="self">self</span>.cipher_init(type_, key, iv, ffi::EVP_EncryptInit_ex) |
| } |
| |
| <span class="doccomment">/// Initializes the context for decryption. |
| /// |
| /// Normally this is called once to set all of the cipher, key, and IV. However, this process can be split up |
| /// by first setting the cipher with no key or IV and then setting the key and IV with no cipher. This can be used |
| /// to, for example, use a nonstandard IV size. |
| /// |
| /// # Panics |
| /// |
| /// Panics if the key buffer is smaller than the key size of the cipher, the IV buffer is smaller than the IV size |
| /// of the cipher, or if a key or IV is provided before a cipher. |
| </span><span class="attribute">#[corresponds(EVP_DecryptInit_ex)] |
| </span><span class="kw">pub fn </span>decrypt_init( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| type_: <span class="prelude-ty">Option</span><<span class="kw-2">&</span>CipherRef>, |
| key: <span class="prelude-ty">Option</span><<span class="kw-2">&</span>[u8]>, |
| iv: <span class="prelude-ty">Option</span><<span class="kw-2">&</span>[u8]>, |
| ) -> <span class="prelude-ty">Result</span><(), ErrorStack> { |
| <span class="self">self</span>.cipher_init(type_, key, iv, ffi::EVP_DecryptInit_ex) |
| } |
| |
| <span class="kw">fn </span>cipher_init( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| type_: <span class="prelude-ty">Option</span><<span class="kw-2">&</span>CipherRef>, |
| key: <span class="prelude-ty">Option</span><<span class="kw-2">&</span>[u8]>, |
| iv: <span class="prelude-ty">Option</span><<span class="kw-2">&</span>[u8]>, |
| f: <span class="kw">unsafe extern </span><span class="string">"C" </span><span class="kw">fn</span>( |
| <span class="kw-2">*mut </span>ffi::EVP_CIPHER_CTX, |
| <span class="kw-2">*const </span>ffi::EVP_CIPHER, |
| <span class="kw-2">*mut </span>ffi::ENGINE, |
| <span class="kw-2">*const </span>c_uchar, |
| <span class="kw-2">*const </span>c_uchar, |
| ) -> c_int, |
| ) -> <span class="prelude-ty">Result</span><(), ErrorStack> { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(key) = key { |
| <span class="kw">let </span>key_len = type_.map_or_else(|| <span class="self">self</span>.key_length(), |c| c.key_length()); |
| <span class="macro">assert!</span>(key_len <= key.len()); |
| } |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(iv) = iv { |
| <span class="kw">let </span>iv_len = type_.map_or_else(|| <span class="self">self</span>.iv_length(), |c| c.iv_length()); |
| <span class="macro">assert!</span>(iv_len <= iv.len()); |
| } |
| |
| <span class="kw">unsafe </span>{ |
| cvt(f( |
| <span class="self">self</span>.as_ptr(), |
| type_.map_or(ptr::null(), |p| p.as_ptr()), |
| ptr::null_mut(), |
| key.map_or(ptr::null(), |k| k.as_ptr()), |
| iv.map_or(ptr::null(), |iv| iv.as_ptr()), |
| ))<span class="question-mark">?</span>; |
| } |
| |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="doccomment">/// Initializes the context to perform envelope encryption. |
| /// |
| /// Normally this is called once to set both the cipher and public keys. However, this process may be split up by |
| /// first providing the cipher with no public keys and then setting the public keys with no cipher. |
| /// |
| /// `encrypted_keys` will contain the generated symmetric key encrypted with each corresponding asymmetric private |
| /// key. The generated IV will be written to `iv`. |
| /// |
| /// # Panics |
| /// |
| /// Panics if `pub_keys` is not the same size as `encrypted_keys`, the IV buffer is smaller than the cipher's IV |
| /// size, or if an IV is provided before the cipher. |
| </span><span class="attribute">#[corresponds(EVP_SealInit)] |
| #[cfg(not(boringssl))] |
| </span><span class="kw">pub fn </span>seal_init<T>( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| type_: <span class="prelude-ty">Option</span><<span class="kw-2">&</span>CipherRef>, |
| pub_keys: <span class="kw-2">&</span>[PKey<T>], |
| encrypted_keys: <span class="kw-2">&mut </span>[Vec<u8>], |
| iv: <span class="prelude-ty">Option</span><<span class="kw-2">&mut </span>[u8]>, |
| ) -> <span class="prelude-ty">Result</span><(), ErrorStack> |
| <span class="kw">where |
| </span>T: HasPublic, |
| { |
| <span class="macro">assert_eq!</span>(pub_keys.len(), encrypted_keys.len()); |
| <span class="kw">if </span>!pub_keys.is_empty() { |
| <span class="kw">let </span>iv_len = type_.map_or_else(|| <span class="self">self</span>.iv_length(), |c| c.iv_length()); |
| <span class="macro">assert!</span>(iv.as_ref().map_or(<span class="number">0</span>, |b| b.len()) >= iv_len); |
| } |
| |
| <span class="kw">for </span>(pub_key, buf) <span class="kw">in </span>pub_keys.iter().zip(<span class="kw-2">&mut *</span>encrypted_keys) { |
| buf.resize(pub_key.size(), <span class="number">0</span>); |
| } |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>keys = encrypted_keys |
| .iter_mut() |
| .map(|b| b.as_mut_ptr()) |
| .collect::<Vec<<span class="kw">_</span>>>(); |
| <span class="kw">let </span><span class="kw-2">mut </span>key_lengths = <span class="macro">vec!</span>[<span class="number">0</span>; pub_keys.len()]; |
| <span class="kw">let </span>pub_keys_len = i32::try_from(pub_keys.len()).unwrap(); |
| |
| <span class="kw">unsafe </span>{ |
| cvt(ffi::EVP_SealInit( |
| <span class="self">self</span>.as_ptr(), |
| type_.map_or(ptr::null(), |p| p.as_ptr()), |
| keys.as_mut_ptr(), |
| key_lengths.as_mut_ptr(), |
| iv.map_or(ptr::null_mut(), |b| b.as_mut_ptr()), |
| pub_keys.as_ptr() <span class="kw">as </span><span class="kw-2">*mut </span><span class="kw">_</span>, |
| pub_keys_len, |
| ))<span class="question-mark">?</span>; |
| } |
| |
| <span class="kw">for </span>(buf, len) <span class="kw">in </span>encrypted_keys.iter_mut().zip(key_lengths) { |
| buf.truncate(len <span class="kw">as </span>usize); |
| } |
| |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="doccomment">/// Initializes the context to perform envelope decryption. |
| /// |
| /// Normally this is called once with all of the arguments present. However, this process may be split up by first |
| /// providing the cipher alone and then after providing the rest of the arguments in a second call. |
| /// |
| /// # Panics |
| /// |
| /// Panics if the IV buffer is smaller than the cipher's required IV size or if the IV is provided before the |
| /// cipher. |
| </span><span class="attribute">#[corresponds(EVP_OpenInit)] |
| #[cfg(not(boringssl))] |
| </span><span class="kw">pub fn </span>open_init<T>( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| type_: <span class="prelude-ty">Option</span><<span class="kw-2">&</span>CipherRef>, |
| encrypted_key: <span class="kw-2">&</span>[u8], |
| iv: <span class="prelude-ty">Option</span><<span class="kw-2">&</span>[u8]>, |
| priv_key: <span class="prelude-ty">Option</span><<span class="kw-2">&</span>PKeyRef<T>>, |
| ) -> <span class="prelude-ty">Result</span><(), ErrorStack> |
| <span class="kw">where |
| </span>T: HasPrivate, |
| { |
| <span class="kw">if </span>priv_key.is_some() { |
| <span class="kw">let </span>iv_len = type_.map_or_else(|| <span class="self">self</span>.iv_length(), |c| c.iv_length()); |
| <span class="macro">assert!</span>(iv.map_or(<span class="number">0</span>, |b| b.len()) >= iv_len); |
| } |
| |
| <span class="kw">let </span>len = c_int::try_from(encrypted_key.len()).unwrap(); |
| <span class="kw">unsafe </span>{ |
| cvt(ffi::EVP_OpenInit( |
| <span class="self">self</span>.as_ptr(), |
| type_.map_or(ptr::null(), |p| p.as_ptr()), |
| encrypted_key.as_ptr(), |
| len, |
| iv.map_or(ptr::null(), |b| b.as_ptr()), |
| priv_key.map_or(ptr::null_mut(), ForeignTypeRef::as_ptr), |
| ))<span class="question-mark">?</span>; |
| } |
| |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="kw">fn </span>assert_cipher(<span class="kw-2">&</span><span class="self">self</span>) { |
| <span class="kw">unsafe </span>{ |
| <span class="macro">assert!</span>(!EVP_CIPHER_CTX_get0_cipher(<span class="self">self</span>.as_ptr()).is_null()); |
| } |
| } |
| |
| <span class="doccomment">/// Returns the block size of the context's cipher. |
| /// |
| /// Stream ciphers will report a block size of 1. |
| /// |
| /// # Panics |
| /// |
| /// Panics if the context has not been initialized with a cipher. |
| </span><span class="attribute">#[corresponds(EVP_CIPHER_CTX_block_size)] |
| </span><span class="kw">pub fn </span>block_size(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.assert_cipher(); |
| |
| <span class="kw">unsafe </span>{ ffi::EVP_CIPHER_CTX_block_size(<span class="self">self</span>.as_ptr()) <span class="kw">as </span>usize } |
| } |
| |
| <span class="doccomment">/// Returns the key length of the context's cipher. |
| /// |
| /// # Panics |
| /// |
| /// Panics if the context has not been initialized with a cipher. |
| </span><span class="attribute">#[corresponds(EVP_CIPHER_CTX_key_length)] |
| </span><span class="kw">pub fn </span>key_length(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.assert_cipher(); |
| |
| <span class="kw">unsafe </span>{ ffi::EVP_CIPHER_CTX_key_length(<span class="self">self</span>.as_ptr()) <span class="kw">as </span>usize } |
| } |
| |
| <span class="doccomment">/// Generates a random key based on the configured cipher. |
| /// |
| /// # Panics |
| /// |
| /// Panics if the context has not been initialized with a cipher or if the buffer is smaller than the cipher's key |
| /// length. |
| /// |
| /// This corresponds to [`EVP_CIPHER_CTX_rand_key`]. |
| /// |
| /// [`EVP_CIPHER_CTX_rand_key`]: https://www.openssl.org/docs/manmaster/man3/EVP_CIPHER_CTX_rand_key.html |
| </span><span class="attribute">#[corresponds(EVP_CIPHER_CTX_rand_key)] |
| #[cfg(not(boringssl))] |
| </span><span class="kw">pub fn </span>rand_key(<span class="kw-2">&</span><span class="self">self</span>, buf: <span class="kw-2">&mut </span>[u8]) -> <span class="prelude-ty">Result</span><(), ErrorStack> { |
| <span class="macro">assert!</span>(buf.len() >= <span class="self">self</span>.key_length()); |
| |
| <span class="kw">unsafe </span>{ |
| cvt(ffi::EVP_CIPHER_CTX_rand_key( |
| <span class="self">self</span>.as_ptr(), |
| buf.as_mut_ptr(), |
| ))<span class="question-mark">?</span>; |
| } |
| |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="doccomment">/// Sets the length of the key expected by the context. |
| /// |
| /// Only some ciphers support configurable key lengths. |
| /// |
| /// # Panics |
| /// |
| /// Panics if the context has not been initialized with a cipher. |
| </span><span class="attribute">#[corresponds(EVP_CIPHER_CTX_set_key_length)] |
| </span><span class="kw">pub fn </span>set_key_length(<span class="kw-2">&mut </span><span class="self">self</span>, len: usize) -> <span class="prelude-ty">Result</span><(), ErrorStack> { |
| <span class="self">self</span>.assert_cipher(); |
| |
| <span class="kw">unsafe </span>{ |
| cvt(ffi::EVP_CIPHER_CTX_set_key_length( |
| <span class="self">self</span>.as_ptr(), |
| len.try_into().unwrap(), |
| ))<span class="question-mark">?</span>; |
| } |
| |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="doccomment">/// Returns the length of the IV expected by this context. |
| /// |
| /// Returns 0 if the cipher does not use an IV. |
| /// |
| /// # Panics |
| /// |
| /// Panics if the context has not been initialized with a cipher. |
| </span><span class="attribute">#[corresponds(EVP_CIPHER_CTX_iv_length)] |
| </span><span class="kw">pub fn </span>iv_length(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.assert_cipher(); |
| |
| <span class="kw">unsafe </span>{ ffi::EVP_CIPHER_CTX_iv_length(<span class="self">self</span>.as_ptr()) <span class="kw">as </span>usize } |
| } |
| |
| <span class="doccomment">/// Returns the `num` parameter of the cipher. |
| /// |
| /// Built-in ciphers typically use this to track how much of the |
| /// current underlying block has been "used" already. |
| /// |
| /// # Panics |
| /// |
| /// Panics if the context has not been initialized with a cipher. |
| </span><span class="attribute">#[corresponds(EVP_CIPHER_CTX_num)] |
| #[cfg(ossl110)] |
| </span><span class="kw">pub fn </span>num(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.assert_cipher(); |
| |
| <span class="kw">unsafe </span>{ ffi::EVP_CIPHER_CTX_num(<span class="self">self</span>.as_ptr()) <span class="kw">as </span>usize } |
| } |
| |
| <span class="doccomment">/// Sets the length of the IV expected by this context. |
| /// |
| /// Only some ciphers support configurable IV lengths. |
| /// |
| /// # Panics |
| /// |
| /// Panics if the context has not been initialized with a cipher. |
| </span><span class="attribute">#[corresponds(EVP_CIPHER_CTX_ctrl)] |
| </span><span class="kw">pub fn </span>set_iv_length(<span class="kw-2">&mut </span><span class="self">self</span>, len: usize) -> <span class="prelude-ty">Result</span><(), ErrorStack> { |
| <span class="self">self</span>.assert_cipher(); |
| |
| <span class="kw">let </span>len = c_int::try_from(len).unwrap(); |
| |
| <span class="kw">unsafe </span>{ |
| cvt(ffi::EVP_CIPHER_CTX_ctrl( |
| <span class="self">self</span>.as_ptr(), |
| ffi::EVP_CTRL_GCM_SET_IVLEN, |
| len, |
| ptr::null_mut(), |
| ))<span class="question-mark">?</span>; |
| } |
| |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="doccomment">/// Returns the length of the authentication tag expected by this context. |
| /// |
| /// Returns 0 if the cipher is not authenticated. |
| /// |
| /// # Panics |
| /// |
| /// Panics if the context has not been initialized with a cipher. |
| /// |
| /// Requires OpenSSL 3.0.0 or newer. |
| </span><span class="attribute">#[corresponds(EVP_CIPHER_CTX_get_tag_length)] |
| #[cfg(ossl300)] |
| </span><span class="kw">pub fn </span>tag_length(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.assert_cipher(); |
| |
| <span class="kw">unsafe </span>{ ffi::EVP_CIPHER_CTX_get_tag_length(<span class="self">self</span>.as_ptr()) <span class="kw">as </span>usize } |
| } |
| |
| <span class="doccomment">/// Retrieves the calculated authentication tag from the context. |
| /// |
| /// This should be called after [`Self::cipher_final`], and is only supported by authenticated ciphers. |
| /// |
| /// The size of the buffer indicates the size of the tag. While some ciphers support a range of tag sizes, it is |
| /// recommended to pick the maximum size. |
| </span><span class="attribute">#[corresponds(EVP_CIPHER_CTX_ctrl)] |
| </span><span class="kw">pub fn </span>tag(<span class="kw-2">&</span><span class="self">self</span>, tag: <span class="kw-2">&mut </span>[u8]) -> <span class="prelude-ty">Result</span><(), ErrorStack> { |
| <span class="kw">let </span>len = c_int::try_from(tag.len()).unwrap(); |
| |
| <span class="kw">unsafe </span>{ |
| cvt(ffi::EVP_CIPHER_CTX_ctrl( |
| <span class="self">self</span>.as_ptr(), |
| ffi::EVP_CTRL_GCM_GET_TAG, |
| len, |
| tag.as_mut_ptr() <span class="kw">as </span><span class="kw-2">*mut </span><span class="kw">_</span>, |
| ))<span class="question-mark">?</span>; |
| } |
| |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="doccomment">/// Sets the length of the generated authentication tag. |
| /// |
| /// This must be called when encrypting with a cipher in CCM mode to use a tag size other than the default. |
| </span><span class="attribute">#[corresponds(EVP_CIPHER_CTX_ctrl)] |
| </span><span class="kw">pub fn </span>set_tag_length(<span class="kw-2">&mut </span><span class="self">self</span>, len: usize) -> <span class="prelude-ty">Result</span><(), ErrorStack> { |
| <span class="kw">let </span>len = c_int::try_from(len).unwrap(); |
| |
| <span class="kw">unsafe </span>{ |
| cvt(ffi::EVP_CIPHER_CTX_ctrl( |
| <span class="self">self</span>.as_ptr(), |
| ffi::EVP_CTRL_GCM_SET_TAG, |
| len, |
| ptr::null_mut(), |
| ))<span class="question-mark">?</span>; |
| } |
| |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="doccomment">/// Sets the authentication tag for verification during decryption. |
| </span><span class="attribute">#[corresponds(EVP_CIPHER_CTX_ctrl)] |
| </span><span class="kw">pub fn </span>set_tag(<span class="kw-2">&mut </span><span class="self">self</span>, tag: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Result</span><(), ErrorStack> { |
| <span class="kw">let </span>len = c_int::try_from(tag.len()).unwrap(); |
| |
| <span class="kw">unsafe </span>{ |
| cvt(ffi::EVP_CIPHER_CTX_ctrl( |
| <span class="self">self</span>.as_ptr(), |
| ffi::EVP_CTRL_GCM_SET_TAG, |
| len, |
| tag.as_ptr() <span class="kw">as </span><span class="kw-2">*mut </span><span class="kw">_</span>, |
| ))<span class="question-mark">?</span>; |
| } |
| |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="doccomment">/// Enables or disables padding. |
| /// |
| /// If padding is disabled, the plaintext must be an exact multiple of the cipher's block size. |
| </span><span class="attribute">#[corresponds(EVP_CIPHER_CTX_set_padding)] |
| </span><span class="kw">pub fn </span>set_padding(<span class="kw-2">&mut </span><span class="self">self</span>, padding: bool) { |
| <span class="kw">unsafe </span>{ |
| ffi::EVP_CIPHER_CTX_set_padding(<span class="self">self</span>.as_ptr(), padding <span class="kw">as </span>c_int); |
| } |
| } |
| |
| <span class="doccomment">/// Sets the total length of plaintext data. |
| /// |
| /// This is required for ciphers operating in CCM mode. |
| </span><span class="attribute">#[corresponds(EVP_CipherUpdate)] |
| </span><span class="kw">pub fn </span>set_data_len(<span class="kw-2">&mut </span><span class="self">self</span>, len: usize) -> <span class="prelude-ty">Result</span><(), ErrorStack> { |
| <span class="kw">let </span>len = c_int::try_from(len).unwrap(); |
| |
| <span class="kw">unsafe </span>{ |
| cvt(ffi::EVP_CipherUpdate( |
| <span class="self">self</span>.as_ptr(), |
| ptr::null_mut(), |
| <span class="kw-2">&mut </span><span class="number">0</span>, |
| ptr::null(), |
| len, |
| ))<span class="question-mark">?</span>; |
| } |
| |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="doccomment">/// Writes data into the context. |
| /// |
| /// Providing no output buffer will cause the input to be considered additional authenticated data (AAD). |
| /// |
| /// Returns the number of bytes written to `output`. |
| /// |
| /// # Panics |
| /// |
| /// Panics if `output` doesn't contain enough space for data to be |
| /// written as specified by [`Self::minimal_output_size`]. |
| </span><span class="attribute">#[corresponds(EVP_CipherUpdate)] |
| </span><span class="kw">pub fn </span>cipher_update( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| input: <span class="kw-2">&</span>[u8], |
| output: <span class="prelude-ty">Option</span><<span class="kw-2">&mut </span>[u8]>, |
| ) -> <span class="prelude-ty">Result</span><usize, ErrorStack> { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(output) = <span class="kw-2">&</span>output { |
| <span class="kw">let </span><span class="kw-2">mut </span>block_size = <span class="self">self</span>.block_size(); |
| <span class="kw">if </span>block_size == <span class="number">1 </span>{ |
| block_size = <span class="number">0</span>; |
| } |
| <span class="kw">let </span>min_output_size = input.len() + block_size; |
| <span class="macro">assert!</span>( |
| output.len() >= min_output_size, |
| <span class="string">"Output buffer size should be at least {} bytes."</span>, |
| min_output_size |
| ); |
| } |
| |
| <span class="kw">unsafe </span>{ <span class="self">self</span>.cipher_update_unchecked(input, output) } |
| } |
| |
| <span class="doccomment">/// Writes data into the context. |
| /// |
| /// Providing no output buffer will cause the input to be considered additional authenticated data (AAD). |
| /// |
| /// Returns the number of bytes written to `output`. |
| /// |
| /// This function is the same as [`Self::cipher_update`] but with the |
| /// output size check removed. It can be used when the exact |
| /// buffer size control is maintained by the caller. |
| /// |
| /// SAFETY: The caller is expected to provide `output` buffer |
| /// large enough to contain correct number of bytes. For streaming |
| /// ciphers the output buffer size should be at least as big as |
| /// the input buffer. For block ciphers the size of the output |
| /// buffer depends on the state of partially updated blocks. |
| </span><span class="attribute">#[corresponds(EVP_CipherUpdate)] |
| </span><span class="kw">pub unsafe fn </span>cipher_update_unchecked( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| input: <span class="kw-2">&</span>[u8], |
| output: <span class="prelude-ty">Option</span><<span class="kw-2">&mut </span>[u8]>, |
| ) -> <span class="prelude-ty">Result</span><usize, ErrorStack> { |
| <span class="kw">let </span>inlen = c_int::try_from(input.len()).unwrap(); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>outlen = <span class="number">0</span>; |
| |
| cvt(ffi::EVP_CipherUpdate( |
| <span class="self">self</span>.as_ptr(), |
| output.map_or(ptr::null_mut(), |b| b.as_mut_ptr()), |
| <span class="kw-2">&mut </span>outlen, |
| input.as_ptr(), |
| inlen, |
| ))<span class="question-mark">?</span>; |
| |
| <span class="prelude-val">Ok</span>(outlen <span class="kw">as </span>usize) |
| } |
| |
| <span class="doccomment">/// Like [`Self::cipher_update`] except that it appends output to a [`Vec`]. |
| </span><span class="kw">pub fn </span>cipher_update_vec( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| input: <span class="kw-2">&</span>[u8], |
| output: <span class="kw-2">&mut </span>Vec<u8>, |
| ) -> <span class="prelude-ty">Result</span><usize, ErrorStack> { |
| <span class="kw">let </span>base = output.len(); |
| output.resize(base + input.len() + <span class="self">self</span>.block_size(), <span class="number">0</span>); |
| <span class="kw">let </span>len = <span class="self">self</span>.cipher_update(input, <span class="prelude-val">Some</span>(<span class="kw-2">&mut </span>output[base..]))<span class="question-mark">?</span>; |
| output.truncate(base + len); |
| |
| <span class="prelude-val">Ok</span>(len) |
| } |
| |
| <span class="doccomment">/// Like [`Self::cipher_update`] except that it writes output into the |
| /// `data` buffer. The `inlen` parameter specifies the number of bytes in |
| /// `data` that are considered the input. For streaming ciphers, the size of |
| /// `data` must be at least the input size. Otherwise, it must be at least |
| /// an additional block size larger. |
| /// |
| /// Note: Use [`Self::cipher_update`] with no output argument to write AAD. |
| /// |
| /// # Panics |
| /// |
| /// This function panics if the input size cannot be represented as `int` or |
| /// exceeds the buffer size, or if the output buffer does not contain enough |
| /// additional space. |
| </span><span class="attribute">#[corresponds(EVP_CipherUpdate)] |
| </span><span class="kw">pub fn </span>cipher_update_inplace( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| data: <span class="kw-2">&mut </span>[u8], |
| inlen: usize, |
| ) -> <span class="prelude-ty">Result</span><usize, ErrorStack> { |
| <span class="macro">assert!</span>(inlen <= data.len(), <span class="string">"Input size may not exceed buffer size"</span>); |
| <span class="kw">let </span>block_size = <span class="self">self</span>.block_size(); |
| <span class="kw">if </span>block_size != <span class="number">1 </span>{ |
| <span class="macro">assert!</span>( |
| data.len() >= inlen + block_size, |
| <span class="string">"Output buffer size must be at least {} bytes."</span>, |
| inlen + block_size |
| ); |
| } |
| |
| <span class="kw">let </span>inlen = c_int::try_from(inlen).unwrap(); |
| <span class="kw">let </span><span class="kw-2">mut </span>outlen = <span class="number">0</span>; |
| <span class="kw">unsafe </span>{ |
| cvt(ffi::EVP_CipherUpdate( |
| <span class="self">self</span>.as_ptr(), |
| data.as_mut_ptr(), |
| <span class="kw-2">&mut </span>outlen, |
| data.as_ptr(), |
| inlen, |
| )) |
| }<span class="question-mark">?</span>; |
| |
| <span class="prelude-val">Ok</span>(outlen <span class="kw">as </span>usize) |
| } |
| |
| <span class="doccomment">/// Finalizes the encryption or decryption process. |
| /// |
| /// Any remaining data will be written to the output buffer. |
| /// |
| /// Returns the number of bytes written to `output`. |
| /// |
| /// # Panics |
| /// |
| /// Panics if `output` is smaller than the cipher's block size. |
| </span><span class="attribute">#[corresponds(EVP_CipherFinal)] |
| </span><span class="kw">pub fn </span>cipher_final(<span class="kw-2">&mut </span><span class="self">self</span>, output: <span class="kw-2">&mut </span>[u8]) -> <span class="prelude-ty">Result</span><usize, ErrorStack> { |
| <span class="kw">let </span>block_size = <span class="self">self</span>.block_size(); |
| <span class="kw">if </span>block_size > <span class="number">1 </span>{ |
| <span class="macro">assert!</span>(output.len() >= block_size); |
| } |
| |
| <span class="kw">unsafe </span>{ <span class="self">self</span>.cipher_final_unchecked(output) } |
| } |
| |
| <span class="doccomment">/// Finalizes the encryption or decryption process. |
| /// |
| /// Any remaining data will be written to the output buffer. |
| /// |
| /// Returns the number of bytes written to `output`. |
| /// |
| /// This function is the same as [`Self::cipher_final`] but with |
| /// the output buffer size check removed. |
| /// |
| /// SAFETY: The caller is expected to provide `output` buffer |
| /// large enough to contain correct number of bytes. For streaming |
| /// ciphers the output buffer can be empty, for block ciphers the |
| /// output buffer should be at least as big as the block. |
| </span><span class="attribute">#[corresponds(EVP_CipherFinal)] |
| </span><span class="kw">pub unsafe fn </span>cipher_final_unchecked( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| output: <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>outl = <span class="number">0</span>; |
| |
| cvt(ffi::EVP_CipherFinal( |
| <span class="self">self</span>.as_ptr(), |
| output.as_mut_ptr(), |
| <span class="kw-2">&mut </span>outl, |
| ))<span class="question-mark">?</span>; |
| |
| <span class="prelude-val">Ok</span>(outl <span class="kw">as </span>usize) |
| } |
| |
| <span class="doccomment">/// Like [`Self::cipher_final`] except that it appends output to a [`Vec`]. |
| </span><span class="kw">pub fn </span>cipher_final_vec(<span class="kw-2">&mut </span><span class="self">self</span>, output: <span class="kw-2">&mut </span>Vec<u8>) -> <span class="prelude-ty">Result</span><usize, ErrorStack> { |
| <span class="kw">let </span>base = output.len(); |
| output.resize(base + <span class="self">self</span>.block_size(), <span class="number">0</span>); |
| <span class="kw">let </span>len = <span class="self">self</span>.cipher_final(<span class="kw-2">&mut </span>output[base..])<span class="question-mark">?</span>; |
| output.truncate(base + len); |
| |
| <span class="prelude-val">Ok</span>(len) |
| } |
| } |
| |
| <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 crate</span>::{cipher::Cipher, rand::rand_bytes}; |
| <span class="attribute">#[cfg(not(boringssl))] |
| </span><span class="kw">use </span>std::slice; |
| |
| <span class="attribute">#[test] |
| #[cfg(not(boringssl))] |
| </span><span class="kw">fn </span>seal_open() { |
| <span class="kw">let </span>private_pem = <span class="macro">include_bytes!</span>(<span class="string">"../test/rsa.pem"</span>); |
| <span class="kw">let </span>public_pem = <span class="macro">include_bytes!</span>(<span class="string">"../test/rsa.pem.pub"</span>); |
| <span class="kw">let </span>private_key = PKey::private_key_from_pem(private_pem).unwrap(); |
| <span class="kw">let </span>public_key = PKey::public_key_from_pem(public_pem).unwrap(); |
| <span class="kw">let </span>cipher = Cipher::aes_256_cbc(); |
| <span class="kw">let </span>secret = <span class="string">b"My secret message"</span>; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>ctx = CipherCtx::new().unwrap(); |
| <span class="kw">let </span><span class="kw-2">mut </span>encrypted_key = <span class="macro">vec!</span>[]; |
| <span class="kw">let </span><span class="kw-2">mut </span>iv = <span class="macro">vec!</span>[<span class="number">0</span>; cipher.iv_length()]; |
| <span class="kw">let </span><span class="kw-2">mut </span>encrypted = <span class="macro">vec!</span>[]; |
| ctx.seal_init( |
| <span class="prelude-val">Some</span>(cipher), |
| <span class="kw-2">&</span>[public_key], |
| slice::from_mut(<span class="kw-2">&mut </span>encrypted_key), |
| <span class="prelude-val">Some</span>(<span class="kw-2">&mut </span>iv), |
| ) |
| .unwrap(); |
| ctx.cipher_update_vec(secret, <span class="kw-2">&mut </span>encrypted).unwrap(); |
| ctx.cipher_final_vec(<span class="kw-2">&mut </span>encrypted).unwrap(); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>decrypted = <span class="macro">vec!</span>[]; |
| ctx.open_init(<span class="prelude-val">Some</span>(cipher), <span class="kw-2">&</span>encrypted_key, <span class="prelude-val">Some</span>(<span class="kw-2">&</span>iv), <span class="prelude-val">Some</span>(<span class="kw-2">&</span>private_key)) |
| .unwrap(); |
| ctx.cipher_update_vec(<span class="kw-2">&</span>encrypted, <span class="kw-2">&mut </span>decrypted).unwrap(); |
| ctx.cipher_final_vec(<span class="kw-2">&mut </span>decrypted).unwrap(); |
| |
| <span class="macro">assert_eq!</span>(secret, <span class="kw-2">&</span>decrypted[..]); |
| } |
| |
| <span class="kw">fn </span>aes_128_cbc(cipher: <span class="kw-2">&</span>CipherRef) { |
| <span class="comment">// from https://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-38a.pdf |
| </span><span class="kw">let </span>key = hex::decode(<span class="string">"2b7e151628aed2a6abf7158809cf4f3c"</span>).unwrap(); |
| <span class="kw">let </span>iv = hex::decode(<span class="string">"000102030405060708090a0b0c0d0e0f"</span>).unwrap(); |
| <span class="kw">let </span>pt = hex::decode(<span class="string">"6bc1bee22e409f96e93d7e117393172aae2d8a571e03ac9c9eb76fac45af8e51"</span>) |
| .unwrap(); |
| <span class="kw">let </span>ct = hex::decode(<span class="string">"7649abac8119b246cee98e9b12e9197d5086cb9b507219ee95db113a917678b2"</span>) |
| .unwrap(); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>ctx = CipherCtx::new().unwrap(); |
| |
| ctx.encrypt_init(<span class="prelude-val">Some</span>(cipher), <span class="prelude-val">Some</span>(<span class="kw-2">&</span>key), <span class="prelude-val">Some</span>(<span class="kw-2">&</span>iv)) |
| .unwrap(); |
| ctx.set_padding(<span class="bool-val">false</span>); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>buf = <span class="macro">vec!</span>[]; |
| ctx.cipher_update_vec(<span class="kw-2">&</span>pt, <span class="kw-2">&mut </span>buf).unwrap(); |
| ctx.cipher_final_vec(<span class="kw-2">&mut </span>buf).unwrap(); |
| |
| <span class="macro">assert_eq!</span>(buf, ct); |
| |
| ctx.decrypt_init(<span class="prelude-val">Some</span>(cipher), <span class="prelude-val">Some</span>(<span class="kw-2">&</span>key), <span class="prelude-val">Some</span>(<span class="kw-2">&</span>iv)) |
| .unwrap(); |
| ctx.set_padding(<span class="bool-val">false</span>); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>buf = <span class="macro">vec!</span>[]; |
| ctx.cipher_update_vec(<span class="kw-2">&</span>ct, <span class="kw-2">&mut </span>buf).unwrap(); |
| ctx.cipher_final_vec(<span class="kw-2">&mut </span>buf).unwrap(); |
| |
| <span class="macro">assert_eq!</span>(buf, pt); |
| } |
| |
| <span class="attribute">#[test] |
| #[cfg(ossl300)] |
| </span><span class="kw">fn </span>fetched_aes_128_cbc() { |
| <span class="kw">let </span>cipher = Cipher::fetch(<span class="prelude-val">None</span>, <span class="string">"AES-128-CBC"</span>, <span class="prelude-val">None</span>).unwrap(); |
| aes_128_cbc(<span class="kw-2">&</span>cipher); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>default_aes_128_cbc() { |
| <span class="kw">let </span>cipher = Cipher::aes_128_cbc(); |
| aes_128_cbc(cipher); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_stream_ciphers() { |
| test_stream_cipher(Cipher::aes_192_ctr()); |
| test_stream_cipher(Cipher::aes_256_ctr()); |
| } |
| |
| <span class="kw">fn </span>test_stream_cipher(cipher: <span class="kw-2">&</span><span class="lifetime">'static </span>CipherRef) { |
| <span class="kw">let </span><span class="kw-2">mut </span>key = <span class="macro">vec!</span>[<span class="number">0</span>; cipher.key_length()]; |
| rand_bytes(<span class="kw-2">&mut </span>key).unwrap(); |
| <span class="kw">let </span><span class="kw-2">mut </span>iv = <span class="macro">vec!</span>[<span class="number">0</span>; cipher.iv_length()]; |
| rand_bytes(<span class="kw-2">&mut </span>iv).unwrap(); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>ctx = CipherCtx::new().unwrap(); |
| |
| ctx.encrypt_init(<span class="prelude-val">Some</span>(cipher), <span class="prelude-val">Some</span>(<span class="kw-2">&</span>key), <span class="prelude-val">Some</span>(<span class="kw-2">&</span>iv)) |
| .unwrap(); |
| ctx.set_padding(<span class="bool-val">false</span>); |
| |
| <span class="macro">assert_eq!</span>( |
| <span class="number">1</span>, |
| cipher.block_size(), |
| <span class="string">"Need a stream cipher, not a block cipher" |
| </span>); |
| |
| <span class="comment">// update cipher with non-full block |
| // this is a streaming cipher so the number of output bytes |
| // will be the same as the number of input bytes |
| </span><span class="kw">let </span><span class="kw-2">mut </span>output = <span class="macro">vec!</span>[<span class="number">0</span>; <span class="number">32</span>]; |
| <span class="kw">let </span>outlen = ctx |
| .cipher_update(<span class="kw-2">&</span>[<span class="number">1</span>; <span class="number">15</span>], <span class="prelude-val">Some</span>(<span class="kw-2">&mut </span>output[<span class="number">0</span>..<span class="number">15</span>])) |
| .unwrap(); |
| <span class="macro">assert_eq!</span>(<span class="number">15</span>, outlen); |
| |
| <span class="comment">// update cipher with missing bytes from the previous block |
| // as previously it will output the same number of bytes as |
| // the input |
| </span><span class="kw">let </span>outlen = ctx |
| .cipher_update(<span class="kw-2">&</span>[<span class="number">1</span>; <span class="number">17</span>], <span class="prelude-val">Some</span>(<span class="kw-2">&mut </span>output[<span class="number">15</span>..])) |
| .unwrap(); |
| <span class="macro">assert_eq!</span>(<span class="number">17</span>, outlen); |
| |
| ctx.cipher_final_vec(<span class="kw-2">&mut </span><span class="macro">vec!</span>[<span class="number">0</span>; <span class="number">0</span>]).unwrap(); |
| |
| <span class="comment">// encrypt again, but use in-place encryption this time |
| // First reset the IV |
| </span>ctx.encrypt_init(<span class="prelude-val">None</span>, <span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(<span class="kw-2">&</span>iv)).unwrap(); |
| ctx.set_padding(<span class="bool-val">false</span>); |
| <span class="kw">let </span><span class="kw-2">mut </span>data_inplace: [u8; <span class="number">32</span>] = [<span class="number">1</span>; <span class="number">32</span>]; |
| <span class="kw">let </span>outlen = ctx |
| .cipher_update_inplace(<span class="kw-2">&mut </span>data_inplace[<span class="number">0</span>..<span class="number">15</span>], <span class="number">15</span>) |
| .unwrap(); |
| <span class="macro">assert_eq!</span>(<span class="number">15</span>, outlen); |
| |
| <span class="kw">let </span>outlen = ctx |
| .cipher_update_inplace(<span class="kw-2">&mut </span>data_inplace[<span class="number">15</span>..<span class="number">32</span>], <span class="number">17</span>) |
| .unwrap(); |
| <span class="macro">assert_eq!</span>(<span class="number">17</span>, outlen); |
| |
| ctx.cipher_final(<span class="kw-2">&mut </span>[<span class="number">0u8</span>; <span class="number">0</span>]).unwrap(); |
| |
| <span class="comment">// Check that the resulting data is encrypted in the same manner |
| </span><span class="macro">assert_eq!</span>(data_inplace.as_slice(), output.as_slice()); |
| |
| <span class="comment">// try to decrypt |
| </span>ctx.decrypt_init(<span class="prelude-val">Some</span>(cipher), <span class="prelude-val">Some</span>(<span class="kw-2">&</span>key), <span class="prelude-val">Some</span>(<span class="kw-2">&</span>iv)) |
| .unwrap(); |
| ctx.set_padding(<span class="bool-val">false</span>); |
| |
| <span class="comment">// update cipher with non-full block |
| // expect that the output for stream cipher will contain |
| // the same number of bytes as the input |
| </span><span class="kw">let </span><span class="kw-2">mut </span>output_decrypted = <span class="macro">vec!</span>[<span class="number">0</span>; <span class="number">32</span>]; |
| <span class="kw">let </span>outlen = ctx |
| .cipher_update(<span class="kw-2">&</span>output[<span class="number">0</span>..<span class="number">15</span>], <span class="prelude-val">Some</span>(<span class="kw-2">&mut </span>output_decrypted[<span class="number">0</span>..<span class="number">15</span>])) |
| .unwrap(); |
| <span class="macro">assert_eq!</span>(<span class="number">15</span>, outlen); |
| |
| <span class="kw">let </span>outlen = ctx |
| .cipher_update(<span class="kw-2">&</span>output[<span class="number">15</span>..], <span class="prelude-val">Some</span>(<span class="kw-2">&mut </span>output_decrypted[<span class="number">15</span>..])) |
| .unwrap(); |
| <span class="macro">assert_eq!</span>(<span class="number">17</span>, outlen); |
| |
| ctx.cipher_final_vec(<span class="kw-2">&mut </span><span class="macro">vec!</span>[<span class="number">0</span>; <span class="number">0</span>]).unwrap(); |
| <span class="comment">// check if the decrypted blocks are the same as input (all ones) |
| </span><span class="macro">assert_eq!</span>(output_decrypted, <span class="macro">vec!</span>[<span class="number">1</span>; <span class="number">32</span>]); |
| |
| <span class="comment">// decrypt again, but now the output in-place |
| </span>ctx.decrypt_init(<span class="prelude-val">None</span>, <span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(<span class="kw-2">&</span>iv)).unwrap(); |
| ctx.set_padding(<span class="bool-val">false</span>); |
| |
| <span class="kw">let </span>outlen = ctx.cipher_update_inplace(<span class="kw-2">&mut </span>output[<span class="number">0</span>..<span class="number">15</span>], <span class="number">15</span>).unwrap(); |
| <span class="macro">assert_eq!</span>(<span class="number">15</span>, outlen); |
| |
| <span class="kw">let </span>outlen = ctx.cipher_update_inplace(<span class="kw-2">&mut </span>output[<span class="number">15</span>..], <span class="number">17</span>).unwrap(); |
| <span class="macro">assert_eq!</span>(<span class="number">17</span>, outlen); |
| |
| ctx.cipher_final_vec(<span class="kw-2">&mut </span><span class="macro">vec!</span>[<span class="number">0</span>; <span class="number">0</span>]).unwrap(); |
| <span class="macro">assert_eq!</span>(output_decrypted, output); |
| } |
| |
| <span class="attribute">#[test] |
| #[should_panic(expected = <span class="string">"Output buffer size should be at least 33 bytes."</span>)] |
| </span><span class="kw">fn </span>full_block_updates_aes_128() { |
| output_buffer_too_small(Cipher::aes_128_cbc()); |
| } |
| |
| <span class="attribute">#[test] |
| #[should_panic(expected = <span class="string">"Output buffer size should be at least 33 bytes."</span>)] |
| </span><span class="kw">fn </span>full_block_updates_aes_256() { |
| output_buffer_too_small(Cipher::aes_256_cbc()); |
| } |
| |
| <span class="attribute">#[test] |
| #[should_panic(expected = <span class="string">"Output buffer size should be at least 17 bytes."</span>)] |
| </span><span class="kw">fn </span>full_block_updates_3des() { |
| output_buffer_too_small(Cipher::des_ede3_cbc()); |
| } |
| |
| <span class="kw">fn </span>output_buffer_too_small(cipher: <span class="kw-2">&</span><span class="lifetime">'static </span>CipherRef) { |
| <span class="kw">let </span><span class="kw-2">mut </span>key = <span class="macro">vec!</span>[<span class="number">0</span>; cipher.key_length()]; |
| rand_bytes(<span class="kw-2">&mut </span>key).unwrap(); |
| <span class="kw">let </span><span class="kw-2">mut </span>iv = <span class="macro">vec!</span>[<span class="number">0</span>; cipher.iv_length()]; |
| rand_bytes(<span class="kw-2">&mut </span>iv).unwrap(); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>ctx = CipherCtx::new().unwrap(); |
| |
| ctx.encrypt_init(<span class="prelude-val">Some</span>(cipher), <span class="prelude-val">Some</span>(<span class="kw-2">&</span>key), <span class="prelude-val">Some</span>(<span class="kw-2">&</span>iv)) |
| .unwrap(); |
| ctx.set_padding(<span class="bool-val">false</span>); |
| |
| <span class="kw">let </span>block_size = cipher.block_size(); |
| <span class="macro">assert!</span>(block_size > <span class="number">1</span>, <span class="string">"Need a block cipher, not a stream cipher"</span>); |
| |
| ctx.cipher_update(<span class="kw-2">&</span><span class="macro">vec!</span>[<span class="number">0</span>; block_size + <span class="number">1</span>], <span class="prelude-val">Some</span>(<span class="kw-2">&mut </span><span class="macro">vec!</span>[<span class="number">0</span>; block_size - <span class="number">1</span>])) |
| .unwrap(); |
| } |
| } |
| </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> |
