| <!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/git/checkouts/incubator-teaclave-crates-c8106113f74feefc/ede1f68/ring/src/aead/aes_gcm.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>aes_gcm.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="../../../ring/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="../../../ring/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="comment">// Copyright 2015-2016 Brian Smith. |
| // |
| // Permission to use, copy, modify, and/or distribute this software for any |
| // purpose with or without fee is hereby granted, provided that the above |
| // copyright notice and this permission notice appear in all copies. |
| // |
| // THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES |
| // WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| // MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY |
| // SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| // WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION |
| // OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN |
| // CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| |
| </span><span class="kw">use super</span>::{ |
| aes::{<span class="self">self</span>, Counter}, |
| gcm, shift, Aad, Block, Direction, Nonce, Tag, BLOCK_LEN, |
| }; |
| <span class="kw">use crate</span>::{aead, cpu, endian::<span class="kw-2">*</span>, error, polyfill}; |
| |
| <span class="doccomment">/// AES-128 in GCM mode with 128-bit tags and 96 bit nonces. |
| </span><span class="kw">pub static </span>AES_128_GCM: aead::Algorithm = aead::Algorithm { |
| key_len: <span class="number">16</span>, |
| init: init_128, |
| seal: aes_gcm_seal, |
| open: aes_gcm_open, |
| id: aead::AlgorithmID::AES_128_GCM, |
| max_input_len: AES_GCM_MAX_INPUT_LEN, |
| }; |
| |
| <span class="doccomment">/// AES-256 in GCM mode with 128-bit tags and 96 bit nonces. |
| </span><span class="kw">pub static </span>AES_256_GCM: aead::Algorithm = aead::Algorithm { |
| key_len: <span class="number">32</span>, |
| init: init_256, |
| seal: aes_gcm_seal, |
| open: aes_gcm_open, |
| id: aead::AlgorithmID::AES_256_GCM, |
| max_input_len: AES_GCM_MAX_INPUT_LEN, |
| }; |
| |
| <span class="kw">pub struct </span>Key { |
| gcm_key: gcm::Key, <span class="comment">// First because it has a large alignment requirement. |
| </span>aes_key: aes::Key, |
| } |
| |
| <span class="kw">fn </span>init_128(key: <span class="kw-2">&</span>[u8], cpu_features: cpu::Features) -> <span class="prelude-ty">Result</span><aead::KeyInner, error::Unspecified> { |
| init(key, aes::Variant::AES_128, cpu_features) |
| } |
| |
| <span class="kw">fn </span>init_256(key: <span class="kw-2">&</span>[u8], cpu_features: cpu::Features) -> <span class="prelude-ty">Result</span><aead::KeyInner, error::Unspecified> { |
| init(key, aes::Variant::AES_256, cpu_features) |
| } |
| |
| <span class="kw">fn </span>init( |
| key: <span class="kw-2">&</span>[u8], |
| variant: aes::Variant, |
| cpu_features: cpu::Features, |
| ) -> <span class="prelude-ty">Result</span><aead::KeyInner, error::Unspecified> { |
| <span class="kw">let </span>aes_key = aes::Key::new(key, variant, cpu_features)<span class="question-mark">?</span>; |
| <span class="kw">let </span>gcm_key = gcm::Key::new(aes_key.encrypt_block(Block::zero()), cpu_features); |
| <span class="prelude-val">Ok</span>(aead::KeyInner::AesGcm(Key { aes_key, gcm_key })) |
| } |
| |
| <span class="kw">const </span>CHUNK_BLOCKS: usize = <span class="number">3 </span>* <span class="number">1024 </span>/ <span class="number">16</span>; |
| |
| <span class="kw">fn </span>aes_gcm_seal( |
| key: <span class="kw-2">&</span>aead::KeyInner, |
| nonce: Nonce, |
| aad: Aad<<span class="kw-2">&</span>[u8]>, |
| in_out: <span class="kw-2">&mut </span>[u8], |
| cpu_features: cpu::Features, |
| ) -> Tag { |
| aead(key, nonce, aad, in_out, Direction::Sealing, cpu_features) |
| } |
| |
| <span class="kw">fn </span>aes_gcm_open( |
| key: <span class="kw-2">&</span>aead::KeyInner, |
| nonce: Nonce, |
| aad: Aad<<span class="kw-2">&</span>[u8]>, |
| in_prefix_len: usize, |
| in_out: <span class="kw-2">&mut </span>[u8], |
| cpu_features: cpu::Features, |
| ) -> Tag { |
| aead( |
| key, |
| nonce, |
| aad, |
| in_out, |
| Direction::Opening { in_prefix_len }, |
| cpu_features, |
| ) |
| } |
| |
| <span class="attribute">#[inline(always)] </span><span class="comment">// Avoid branching on `direction`. |
| </span><span class="kw">fn </span>aead( |
| key: <span class="kw-2">&</span>aead::KeyInner, |
| nonce: Nonce, |
| aad: Aad<<span class="kw-2">&</span>[u8]>, |
| in_out: <span class="kw-2">&mut </span>[u8], |
| direction: Direction, |
| cpu_features: cpu::Features, |
| ) -> Tag { |
| <span class="kw">let </span>Key { aes_key, gcm_key } = <span class="kw">match </span>key { |
| aead::KeyInner::AesGcm(key) => key, |
| <span class="kw">_ </span>=> <span class="macro">unreachable!</span>(), |
| }; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>ctr = Counter::one(nonce); |
| <span class="kw">let </span>tag_iv = ctr.increment(); |
| |
| <span class="kw">let </span>aad_len = aad.<span class="number">0</span>.len(); |
| <span class="kw">let </span><span class="kw-2">mut </span>gcm_ctx = gcm::Context::new(gcm_key, aad, cpu_features); |
| |
| <span class="kw">let </span>in_prefix_len = <span class="kw">match </span>direction { |
| Direction::Opening { in_prefix_len } => in_prefix_len, |
| Direction::Sealing => <span class="number">0</span>, |
| }; |
| |
| <span class="kw">let </span>total_in_out_len = in_out.len() - in_prefix_len; |
| |
| <span class="kw">let </span>in_out = integrated_aes_gcm( |
| aes_key, |
| <span class="kw-2">&mut </span>gcm_ctx, |
| in_out, |
| <span class="kw-2">&mut </span>ctr, |
| direction, |
| cpu_features, |
| ); |
| <span class="kw">let </span>in_out_len = in_out.len() - in_prefix_len; |
| |
| <span class="comment">// Process any (remaining) whole blocks. |
| </span><span class="kw">let </span>whole_len = in_out_len - (in_out_len % BLOCK_LEN); |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>chunk_len = CHUNK_BLOCKS * BLOCK_LEN; |
| <span class="kw">let </span><span class="kw-2">mut </span>output = <span class="number">0</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>input = in_prefix_len; |
| <span class="kw">loop </span>{ |
| <span class="kw">if </span>whole_len - output < chunk_len { |
| chunk_len = whole_len - output; |
| } |
| <span class="kw">if </span>chunk_len == <span class="number">0 </span>{ |
| <span class="kw">break</span>; |
| } |
| |
| <span class="kw">if let </span>Direction::Opening { .. } = direction { |
| gcm_ctx.update_blocks(<span class="kw-2">&</span>in_out[input..][..chunk_len]); |
| } |
| |
| aes_key.ctr32_encrypt_blocks( |
| <span class="kw-2">&mut </span>in_out[output..][..(chunk_len + in_prefix_len)], |
| direction, |
| <span class="kw-2">&mut </span>ctr, |
| ); |
| |
| <span class="kw">if let </span>Direction::Sealing = direction { |
| gcm_ctx.update_blocks(<span class="kw-2">&</span>in_out[output..][..chunk_len]); |
| } |
| |
| output += chunk_len; |
| input += chunk_len; |
| } |
| } |
| |
| <span class="comment">// Process any remaining partial block. |
| </span><span class="kw">let </span>remainder = <span class="kw-2">&mut </span>in_out[whole_len..]; |
| shift::shift_partial((in_prefix_len, remainder), |remainder| { |
| <span class="kw">let </span><span class="kw-2">mut </span>input = Block::zero(); |
| input.overwrite_part_at(<span class="number">0</span>, remainder); |
| <span class="kw">if let </span>Direction::Opening { .. } = direction { |
| gcm_ctx.update_block(input); |
| } |
| <span class="kw">let </span><span class="kw-2">mut </span>output = aes_key.encrypt_iv_xor_block(ctr.into(), input); |
| <span class="kw">if let </span>Direction::Sealing = direction { |
| output.zero_from(remainder.len()); |
| gcm_ctx.update_block(output); |
| } |
| output |
| }); |
| |
| <span class="comment">// Authenticate the final block containing the input lengths. |
| </span><span class="kw">let </span>aad_bits = polyfill::u64_from_usize(aad_len) << <span class="number">3</span>; |
| <span class="kw">let </span>ciphertext_bits = polyfill::u64_from_usize(total_in_out_len) << <span class="number">3</span>; |
| gcm_ctx.update_block(Block::from_u64_be( |
| BigEndian::from(aad_bits), |
| BigEndian::from(ciphertext_bits), |
| )); |
| |
| <span class="comment">// Finalize the tag and return it. |
| </span>gcm_ctx.pre_finish(|pre_tag| { |
| <span class="kw">let </span>bytes = tag_iv.into_bytes_less_safe(); |
| <span class="kw">let </span><span class="kw-2">mut </span>tag = aes_key.encrypt_block(Block::from(<span class="kw-2">&</span>bytes)); |
| tag.bitxor_assign(pre_tag.into()); |
| Tag(<span class="kw-2">*</span>tag.as_ref()) |
| }) |
| } |
| |
| <span class="comment">// Returns the data that wasn't processed. |
| </span><span class="attribute">#[cfg(target_arch = <span class="string">"x86_64"</span>)] |
| #[inline] </span><span class="comment">// Optimize out the match on `direction`. |
| </span><span class="kw">fn </span>integrated_aes_gcm<<span class="lifetime">'a</span>>( |
| aes_key: <span class="kw-2">&</span>aes::Key, |
| gcm_ctx: <span class="kw-2">&mut </span>gcm::Context, |
| in_out: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>[u8], |
| ctr: <span class="kw-2">&mut </span>Counter, |
| direction: Direction, |
| cpu_features: cpu::Features, |
| ) -> <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>[u8] { |
| <span class="kw">use </span><span class="kw">crate</span>::c; |
| |
| <span class="kw">if </span>!aes_key.is_aes_hw() || !gcm_ctx.is_avx2(cpu_features) { |
| <span class="kw">return </span>in_out; |
| } |
| |
| <span class="kw">let </span>processed = <span class="kw">match </span>direction { |
| Direction::Opening { in_prefix_len } => { |
| <span class="kw">extern </span><span class="string">"C" </span>{ |
| <span class="kw">fn </span>GFp_aesni_gcm_decrypt( |
| input: <span class="kw-2">*const </span>u8, |
| output: <span class="kw-2">*mut </span>u8, |
| len: c::size_t, |
| key: <span class="kw-2">&</span>aes::AES_KEY, |
| ivec: <span class="kw-2">&mut </span>Counter, |
| gcm: <span class="kw-2">&mut </span>gcm::ContextInner, |
| ) -> c::size_t; |
| } |
| <span class="kw">unsafe </span>{ |
| GFp_aesni_gcm_decrypt( |
| in_out[in_prefix_len..].as_ptr(), |
| in_out.as_mut_ptr(), |
| in_out.len() - in_prefix_len, |
| aes_key.inner_less_safe(), |
| ctr, |
| gcm_ctx.inner(), |
| ) |
| } |
| } |
| Direction::Sealing => { |
| <span class="kw">extern </span><span class="string">"C" </span>{ |
| <span class="kw">fn </span>GFp_aesni_gcm_encrypt( |
| input: <span class="kw-2">*const </span>u8, |
| output: <span class="kw-2">*mut </span>u8, |
| len: c::size_t, |
| key: <span class="kw-2">&</span>aes::AES_KEY, |
| ivec: <span class="kw-2">&mut </span>Counter, |
| gcm: <span class="kw-2">&mut </span>gcm::ContextInner, |
| ) -> c::size_t; |
| } |
| <span class="kw">unsafe </span>{ |
| GFp_aesni_gcm_encrypt( |
| in_out.as_ptr(), |
| in_out.as_mut_ptr(), |
| in_out.len(), |
| aes_key.inner_less_safe(), |
| ctr, |
| gcm_ctx.inner(), |
| ) |
| } |
| } |
| }; |
| |
| <span class="kw-2">&mut </span>in_out[processed..] |
| } |
| |
| <span class="attribute">#[cfg(not(target_arch = <span class="string">"x86_64"</span>))] |
| #[inline] |
| </span><span class="kw">fn </span>integrated_aes_gcm<<span class="lifetime">'a</span>>( |
| <span class="kw">_</span>: <span class="kw-2">&</span>aes::Key, |
| <span class="kw">_</span>: <span class="kw-2">&mut </span>gcm::Context, |
| in_out: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>[u8], |
| <span class="kw">_</span>: <span class="kw-2">&mut </span>Counter, |
| <span class="kw">_</span>: Direction, |
| <span class="kw">_</span>: cpu::Features, |
| ) -> <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>[u8] { |
| in_out <span class="comment">// This doesn't process any of the input so it all remains. |
| </span>} |
| |
| <span class="kw">const </span>AES_GCM_MAX_INPUT_LEN: u64 = <span class="kw">super</span>::max_input_len(BLOCK_LEN, <span class="number">2</span>); |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>max_input_len_test() { |
| <span class="comment">// [NIST SP800-38D] Section 5.2.1.1. Note that [RFC 5116 Section 5.1] and |
| // [RFC 5116 Section 5.2] have an off-by-one error in `P_MAX`. |
| // |
| // [NIST SP800-38D]: |
| // http://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-38d.pdf |
| // [RFC 5116 Section 5.1]: https://tools.ietf.org/html/rfc5116#section-5.1 |
| // [RFC 5116 Section 5.2]: https://tools.ietf.org/html/rfc5116#section-5.2 |
| </span><span class="kw">const </span>NIST_SP800_38D_MAX_BITS: u64 = (<span class="number">1u64 </span><< <span class="number">39</span>) - <span class="number">256</span>; |
| <span class="macro">assert_eq!</span>(NIST_SP800_38D_MAX_BITS, <span class="number">549_755_813_632u64</span>); |
| <span class="macro">assert_eq!</span>( |
| <span class="kw">super</span>::AES_128_GCM.max_input_len * <span class="number">8</span>, |
| NIST_SP800_38D_MAX_BITS |
| ); |
| <span class="macro">assert_eq!</span>( |
| <span class="kw">super</span>::AES_256_GCM.max_input_len * <span class="number">8</span>, |
| NIST_SP800_38D_MAX_BITS |
| ); |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="ring" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |