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.idea/
# ---> Rust
# Generated by Cargo
# will have compiled files and executables

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[package]
name = "chacha20-poly1305-stream"
version = "0.1.0"
edition = "2021"
authors = ["Cesar Eduardo Barros <cesarb@cesarb.eti.br>", "Hatter Jiang <jht5945@gmail.com>"]
description = "A pure Rust implementation of the ChaCha20-Poly1305 AEAD from RFC 7539."
repository = "https://git.hatter.ink/hatter/chacha20-poly1305-stream"
readme = "README.md"
keywords = ["chacha20", "poly1305", "aead", "crypto"]
license = "MIT OR Apache-2.0"
[features]
bench = []
simd = []
simd_opt = ["simd"]
simd_asm = ["simd_opt"]
[dependencies]
constant_time_eq = "0.1.0"
clippy = { version = "0.0.37", optional = true }

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This is a pure Rust implementation of the ChaCha20-Poly1305 AEAD from
[RFC 7539].
[RFC 7539]: https://tools.ietf.org/html/rfc7539
## Design
There are two main designs for an encryption/decryption API: either
having one state/context struct with a method which is called repeatedly
to encrypt/decrypt the next fragment of data, or having a single
standalone function which is called once and does all the work in a
single call.
For authenticated encryption, it's important that on decryption no
output is produced until the authentication tag is verified. That
requires two passes over the data for decryption: the first pass
verifies the tag, and the second pass does the output. It would be
needlessly complex to implement this with a state/context struct, so
this crate uses a single function call to do the whole decryption. For
simmetry, the same design is used for the encryption function.
The base primitives (ChaCha20 and Poly1305) are not exposed separately,
since they are harder to use securely. This also allows their
implementation to be tuned to the combined use case; for instance, the
base primitives need no buffering.
## Limitations
The amount of data that can be encrypted in a single call is 2^32 - 1
blocks of 64 bytes, slightly less than 256 GiB. This limit could be
increased to 2^64 bytes, if necessary, by allowing the use of a shorter
nonce.
This crate does not attempt to clear potentially sensitive data from its
work memory (which includes the the stack and processor registers). To
do so correctly without a heavy performance penalty would require help
from the compiler. It's better to not attempt to do so than to present a
false assurance.
## SIMD optimization
This crate has experimental support for explicit SIMD optimizations. It
requires nightly Rust due to the use of unstable features.
The following cargo features enable the explicit SIMD optimization:
* `simd` enables the explicit use of SIMD vectors instead of a plain
struct
* `simd_opt` additionally enables the use of SIMD shuffles to implement
some of the rotates
While one might expect that each of these is faster than the previous
one, and that they are all faster than not enabling explicit SIMD
vectors, that's not always the case. It can vary depending on target
architecture and compiler options. If you need the extra speed from
these optimizations, benchmark each one (the `bench` feature enables
`cargo bench` in this crate, so you can use for instance `cargo bench
--features="bench simd_opt"`). They have currently been tuned for SSE2
(x86 and x86-64) and NEON (arm).
## License
Licensed under either of
* Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
* MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
at your option.
### Contribution
Unless you explicitly state otherwise, any contribution intentionally
submitted for inclusion in the work by you, as defined in the Apache-2.0
license, shall be dual licensed as above, without any additional terms or
conditions.

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// Copyright 2016 chacha20-poly1305-aead Developers
//
// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
// http://opensource.org/licenses/MIT>, at your option. This file may not be
// copied, modified, or distributed except according to those terms.
use std::error::Error;
use std::fmt::{self, Display, Formatter};
use std::io::{self, ErrorKind, Read, Write};
use crate::as_bytes::AsBytes;
use crate::chacha20::ChaCha20;
use constant_time_eq::constant_time_eq;
use crate::poly1305::Poly1305;
use crate::simd::u32x4;
const CHACHA20_COUNTER_OVERFLOW: u64 = ((1 << 32) - 1) * 64;
/// Encrypts a byte slice and returns the authentication tag.
///
/// # Example
///
/// ```
/// use chacha20_poly1305_aead::encrypt;
///
/// let key = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16,
/// 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31];
/// let nonce = [1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
/// let aad = [1, 2, 3, 4];
///
/// let plaintext = b"hello, world";
///
/// // Vec implements the Write trait
/// let mut ciphertext = Vec::with_capacity(plaintext.len());
///
/// let tag = encrypt(&key, &nonce, &aad, plaintext, &mut ciphertext).unwrap();
///
/// assert_eq!(ciphertext, [0xfc, 0x5a, 0x17, 0x82,
/// 0xab, 0xcf, 0xbc, 0x5d, 0x18, 0x29, 0xbf, 0x97]);
/// assert_eq!(tag, [0xdb, 0xb7, 0x0d, 0xda, 0xbd, 0xfa, 0x8c, 0xa5,
/// 0x60, 0xa2, 0x30, 0x3d, 0xe6, 0x07, 0x92, 0x10]);
/// ```
pub fn encrypt<W: Write>(key: &[u8], nonce: &[u8],
aad: &[u8], mut input: &[u8],
output: &mut W) -> io::Result<[u8; 16]> {
encrypt_read(key, nonce, aad, &mut input, output)
}
/// Encrypts bytes from a reader and returns the authentication tag.
///
/// This function is identical to the `encrypt` function, the only
/// difference being that its input comes from a reader instead of a
/// byte slice.
pub fn encrypt_read<R: Read, W: Write>(key: &[u8], nonce: &[u8],
aad: &[u8], input: &mut R,
output: &mut W) -> io::Result<[u8; 16]> {
let mut chacha20 = ChaCha20::new(key, nonce);
let mut poly1305 = Poly1305::new(&chacha20.next().as_bytes()[..32]);
let aad_len = aad.len() as u64;
let mut input_len = 0;
poly1305.padded_blocks(aad);
let mut buf = [u32x4::default(); 4];
loop {
let read = read_all(input, buf.as_mut_bytes())?;
if read == 0 { break; }
input_len += read as u64;
if input_len >= CHACHA20_COUNTER_OVERFLOW {
return Err(io::Error::new(ErrorKind::WriteZero,
"counter overflow"));
}
let block = chacha20.next();
buf[0] = buf[0] ^ block[0];
buf[1] = buf[1] ^ block[1];
buf[2] = buf[2] ^ block[2];
buf[3] = buf[3] ^ block[3];
poly1305.padded_blocks(&buf.as_bytes()[..read]);
output.write_all(&buf.as_bytes()[..read])?;
}
poly1305.block([aad_len.to_le(), input_len.to_le()].as_bytes());
let mut tag = [0; 16];
tag.clone_from_slice(poly1305.tag().as_bytes());
Ok(tag)
}
/// Verifies the authentication tag and decrypts a byte slice.
///
/// If the tag does not match, this function produces no output and
/// returns `Err(DecryptError::TagMismatch)`.
///
/// # Example
///
/// ```
/// # use chacha20_poly1305_aead::DecryptError;
/// # fn example() -> Result<(), DecryptError> {
/// use chacha20_poly1305_aead::decrypt;
///
/// let key = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16,
/// 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31];
/// let nonce = [1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
/// let aad = [1, 2, 3, 4];
///
/// let ciphertext = [0xfc, 0x5a, 0x17, 0x82, 0xab, 0xcf, 0xbc, 0x5d,
/// 0x18, 0x29, 0xbf, 0x97];
/// let tag = [0xdb, 0xb7, 0x0d, 0xda, 0xbd, 0xfa, 0x8c, 0xa5,
/// 0x60, 0xa2, 0x30, 0x3d, 0xe6, 0x07, 0x92, 0x10];
///
/// // Vec implements the Write trait
/// let mut plaintext = Vec::with_capacity(ciphertext.len());
///
/// try!(decrypt(&key, &nonce, &aad, &ciphertext, &tag, &mut plaintext));
///
/// assert_eq!(plaintext, b"hello, world");
/// # Ok(())
/// # }
/// # example().unwrap();
/// ```
pub fn decrypt<W: Write>(key: &[u8], nonce: &[u8],
aad: &[u8], mut input: &[u8], tag: &[u8],
output: &mut W) -> Result<(), DecryptError> {
let mut chacha20 = ChaCha20::new(key, nonce);
let mut poly1305 = Poly1305::new(&chacha20.next().as_bytes()[..32]);
let aad_len = aad.len() as u64;
let input_len = input.len() as u64;
assert!(tag.len() == 16);
if input_len >= CHACHA20_COUNTER_OVERFLOW {
return Err(io::Error::new(ErrorKind::WriteZero,
"counter overflow").into());
}
poly1305.padded_blocks(aad);
poly1305.padded_blocks(input);
poly1305.block([aad_len.to_le(), input_len.to_le()].as_bytes());
if !constant_time_eq(poly1305.tag().as_bytes(), tag) {
return Err(DecryptError::TagMismatch);
}
let mut buf = [u32x4::default(); 4];
loop {
let read = read_all(&mut input, buf.as_mut_bytes())?;
if read == 0 { break; }
let block = chacha20.next();
buf[0] = buf[0] ^ block[0];
buf[1] = buf[1] ^ block[1];
buf[2] = buf[2] ^ block[2];
buf[3] = buf[3] ^ block[3];
output.write_all(&buf.as_bytes()[..read])?;
}
Ok(())
}
fn read_all<R: Read>(reader: &mut R, mut buf: &mut [u8]) -> io::Result<usize> {
let mut read = 0;
while !buf.is_empty() {
match reader.read(buf) {
Ok(0) => break,
Ok(n) => { read += n; let tmp = buf; buf = &mut tmp[n..]; }
Err(ref e) if e.kind() == io::ErrorKind::Interrupted => {}
Err(e) => return Err(e),
}
}
Ok(read)
}
/// Error returned from the `decrypt` function.
#[derive(Debug)]
pub enum DecryptError {
/// The calculated Poly1305 tag did not match the given tag.
TagMismatch,
/// There was an error writing the output.
IoError(io::Error),
}
impl Display for DecryptError {
fn fmt(&self, fmt: &mut Formatter) -> fmt::Result {
match *self {
DecryptError::TagMismatch => fmt.write_str(self.description()),
DecryptError::IoError(ref e) => e.fmt(fmt),
}
}
}
impl Error for DecryptError {
fn description(&self) -> &str {
match *self {
DecryptError::TagMismatch => "authentication tag mismatch",
DecryptError::IoError(ref e) => e.description(),
}
}
fn cause(&self) -> Option<&dyn Error> {
match *self {
DecryptError::TagMismatch => None,
DecryptError::IoError(ref e) => Some(e),
}
}
}
impl From<io::Error> for DecryptError {
fn from(error: io::Error) -> Self {
DecryptError::IoError(error)
}
}
impl From<DecryptError> for io::Error {
fn from(error: DecryptError) -> Self {
match error {
DecryptError::IoError(e) => e,
DecryptError::TagMismatch =>
io::Error::new(ErrorKind::InvalidData, error),
}
}
}
pub mod selftest {
use super::*;
static PLAINTEXT: &'static [u8] = b"\
Ladies and Gentlemen of the class of '99: If I could offer you o\
nly one tip for the future, sunscreen would be it.";
static AAD: &'static [u8] = &[0x50, 0x51, 0x52, 0x53,
0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7];
static KEY: &'static [u8] = &[
0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f];
static NONCE: &'static [u8] = &[0x07, 0x00, 0x00, 0x00,
0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47];
static CIPHERTEXT: &'static [u8] = &[
0xd3, 0x1a, 0x8d, 0x34, 0x64, 0x8e, 0x60, 0xdb,
0x7b, 0x86, 0xaf, 0xbc, 0x53, 0xef, 0x7e, 0xc2,
0xa4, 0xad, 0xed, 0x51, 0x29, 0x6e, 0x08, 0xfe,
0xa9, 0xe2, 0xb5, 0xa7, 0x36, 0xee, 0x62, 0xd6,
0x3d, 0xbe, 0xa4, 0x5e, 0x8c, 0xa9, 0x67, 0x12,
0x82, 0xfa, 0xfb, 0x69, 0xda, 0x92, 0x72, 0x8b,
0x1a, 0x71, 0xde, 0x0a, 0x9e, 0x06, 0x0b, 0x29,
0x05, 0xd6, 0xa5, 0xb6, 0x7e, 0xcd, 0x3b, 0x36,
0x92, 0xdd, 0xbd, 0x7f, 0x2d, 0x77, 0x8b, 0x8c,
0x98, 0x03, 0xae, 0xe3, 0x28, 0x09, 0x1b, 0x58,
0xfa, 0xb3, 0x24, 0xe4, 0xfa, 0xd6, 0x75, 0x94,
0x55, 0x85, 0x80, 0x8b, 0x48, 0x31, 0xd7, 0xbc,
0x3f, 0xf4, 0xde, 0xf0, 0x8e, 0x4b, 0x7a, 0x9d,
0xe5, 0x76, 0xd2, 0x65, 0x86, 0xce, 0xc6, 0x4b,
0x61, 0x16];
static TAG: &'static [u8] = &[
0x1a, 0xe1, 0x0b, 0x59, 0x4f, 0x09, 0xe2, 0x6a,
0x7e, 0x90, 0x2e, 0xcb, 0xd0, 0x60, 0x06, 0x91];
#[cold]
pub fn selftest() {
selftest_encrypt();
selftest_decrypt();
selftest_decrypt_mismatch();
}
#[cold]
pub fn selftest_encrypt() {
let mut output = Vec::with_capacity(PLAINTEXT.len());
let tag = encrypt(KEY, NONCE, AAD, PLAINTEXT, &mut output)
.expect("selftest failure");
assert_eq!(&output[..], CIPHERTEXT);
assert_eq!(tag, TAG);
}
#[cold]
pub fn selftest_decrypt() {
let mut output = Vec::with_capacity(CIPHERTEXT.len());
decrypt(KEY, NONCE, AAD, CIPHERTEXT, TAG, &mut output)
.expect("selftest failure");
assert_eq!(&output[..], PLAINTEXT);
}
#[cold]
pub fn selftest_decrypt_mismatch() {
let mut output = Vec::with_capacity(0);
let result = decrypt(KEY, NONCE, AAD, CIPHERTEXT, &[0; 16],
&mut output);
if let Err(DecryptError::TagMismatch) = result {
assert!(output.is_empty());
} else {
panic!("selftest failure");
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn selftest_encrypt() {
selftest::selftest_encrypt();
}
#[test]
fn selftest_decrypt() {
selftest::selftest_decrypt();
}
#[test]
fn selftest_decrypt_mismatch() {
selftest::selftest_decrypt_mismatch();
}
#[test]
fn test_encrypt() {
let mut output = Vec::with_capacity(PLAINTEXT.len());
let tag = encrypt(KEY, NONCE, AAD, PLAINTEXT.as_bytes(),
&mut output).expect("test failed");
assert_eq!(&output[..], CIPHERTEXT);
assert_eq!(tag, TAG);
}
#[test]
fn test_decrypt() {
let mut output = Vec::with_capacity(CIPHERTEXT.len());
decrypt(KEY, NONCE, AAD, CIPHERTEXT, TAG,
&mut output).expect("test failed");
assert_eq!(&output[..], PLAINTEXT.as_bytes());
}
static KEY: &'static [u8] = &[
0x1c, 0x92, 0x40, 0xa5, 0xeb, 0x55, 0xd3, 0x8a,
0xf3, 0x33, 0x88, 0x86, 0x04, 0xf6, 0xb5, 0xf0,
0x47, 0x39, 0x17, 0xc1, 0x40, 0x2b, 0x80, 0x09,
0x9d, 0xca, 0x5c, 0xbc, 0x20, 0x70, 0x75, 0xc0];
static CIPHERTEXT: &'static [u8] = &[
0x64, 0xa0, 0x86, 0x15, 0x75, 0x86, 0x1a, 0xf4,
0x60, 0xf0, 0x62, 0xc7, 0x9b, 0xe6, 0x43, 0xbd,
0x5e, 0x80, 0x5c, 0xfd, 0x34, 0x5c, 0xf3, 0x89,
0xf1, 0x08, 0x67, 0x0a, 0xc7, 0x6c, 0x8c, 0xb2,
0x4c, 0x6c, 0xfc, 0x18, 0x75, 0x5d, 0x43, 0xee,
0xa0, 0x9e, 0xe9, 0x4e, 0x38, 0x2d, 0x26, 0xb0,
0xbd, 0xb7, 0xb7, 0x3c, 0x32, 0x1b, 0x01, 0x00,
0xd4, 0xf0, 0x3b, 0x7f, 0x35, 0x58, 0x94, 0xcf,
0x33, 0x2f, 0x83, 0x0e, 0x71, 0x0b, 0x97, 0xce,
0x98, 0xc8, 0xa8, 0x4a, 0xbd, 0x0b, 0x94, 0x81,
0x14, 0xad, 0x17, 0x6e, 0x00, 0x8d, 0x33, 0xbd,
0x60, 0xf9, 0x82, 0xb1, 0xff, 0x37, 0xc8, 0x55,
0x97, 0x97, 0xa0, 0x6e, 0xf4, 0xf0, 0xef, 0x61,
0xc1, 0x86, 0x32, 0x4e, 0x2b, 0x35, 0x06, 0x38,
0x36, 0x06, 0x90, 0x7b, 0x6a, 0x7c, 0x02, 0xb0,
0xf9, 0xf6, 0x15, 0x7b, 0x53, 0xc8, 0x67, 0xe4,
0xb9, 0x16, 0x6c, 0x76, 0x7b, 0x80, 0x4d, 0x46,
0xa5, 0x9b, 0x52, 0x16, 0xcd, 0xe7, 0xa4, 0xe9,
0x90, 0x40, 0xc5, 0xa4, 0x04, 0x33, 0x22, 0x5e,
0xe2, 0x82, 0xa1, 0xb0, 0xa0, 0x6c, 0x52, 0x3e,
0xaf, 0x45, 0x34, 0xd7, 0xf8, 0x3f, 0xa1, 0x15,
0x5b, 0x00, 0x47, 0x71, 0x8c, 0xbc, 0x54, 0x6a,
0x0d, 0x07, 0x2b, 0x04, 0xb3, 0x56, 0x4e, 0xea,
0x1b, 0x42, 0x22, 0x73, 0xf5, 0x48, 0x27, 0x1a,
0x0b, 0xb2, 0x31, 0x60, 0x53, 0xfa, 0x76, 0x99,
0x19, 0x55, 0xeb, 0xd6, 0x31, 0x59, 0x43, 0x4e,
0xce, 0xbb, 0x4e, 0x46, 0x6d, 0xae, 0x5a, 0x10,
0x73, 0xa6, 0x72, 0x76, 0x27, 0x09, 0x7a, 0x10,
0x49, 0xe6, 0x17, 0xd9, 0x1d, 0x36, 0x10, 0x94,
0xfa, 0x68, 0xf0, 0xff, 0x77, 0x98, 0x71, 0x30,
0x30, 0x5b, 0xea, 0xba, 0x2e, 0xda, 0x04, 0xdf,
0x99, 0x7b, 0x71, 0x4d, 0x6c, 0x6f, 0x2c, 0x29,
0xa6, 0xad, 0x5c, 0xb4, 0x02, 0x2b, 0x02, 0x70,
0x9b];
static NONCE: &'static [u8] = &[0x00, 0x00, 0x00, 0x00,
0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08];
static AAD: &'static [u8] = &[0xf3, 0x33, 0x88, 0x86,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x4e, 0x91];
static TAG: &'static [u8] = &[
0xee, 0xad, 0x9d, 0x67, 0x89, 0x0c, 0xbb, 0x22,
0x39, 0x23, 0x36, 0xfe, 0xa1, 0x85, 0x1f, 0x38];
static PLAINTEXT: &'static str = "\
Internet-Drafts are draft documents valid for a maximum of six m\
onths and may be updated, replaced, or obsoleted by other docume\
nts at any time. It is inappropriate to use Internet-Drafts as r\
eference material or to cite them other than as /\u{201c}work in prog\
ress./\u{201d}";
}
#[cfg(all(feature = "bench", test))]
mod bench {
use test::{Bencher, black_box};
use super::*;
#[cfg_attr(feature = "clippy", allow(result_unwrap_used))]
fn bench_encrypt(b: &mut Bencher, aad: &[u8], data: &[u8]) {
let key = [!0; 32];
let nonce = [!0; 12];
let mut buf = Vec::with_capacity(data.len());
b.bytes = data.len() as u64;
b.iter(|| {
buf.clear();
encrypt(black_box(&key), black_box(&nonce),
black_box(aad), black_box(data),
black_box(&mut buf)).unwrap()
})
}
#[cfg_attr(feature = "clippy", allow(result_unwrap_used))]
fn bench_decrypt(b: &mut Bencher, aad: &[u8], data: &[u8]) {
let key = [!0; 32];
let nonce = [!0; 12];
let mut ciphertext = Vec::with_capacity(data.len());
let tag = encrypt(&key, &nonce, aad, data, &mut ciphertext).unwrap();
let input = &ciphertext[..];
let mut buf = Vec::with_capacity(data.len());
b.bytes = data.len() as u64;
b.iter(|| {
buf.clear();
decrypt(black_box(&key), black_box(&nonce),
black_box(aad), black_box(input), black_box(&tag),
black_box(&mut buf)).unwrap()
})
}
#[bench]
fn bench_encrypt_16(b: &mut Bencher) {
bench_encrypt(b, &[!0; 16], &[!0; 16])
}
#[bench]
fn bench_encrypt_4k(b: &mut Bencher) {
bench_encrypt(b, &[!0; 16], &[!0; 4096])
}
#[bench]
fn bench_encrypt_64k(b: &mut Bencher) {
bench_encrypt(b, &[!0; 16], &[!0; 65536])
}
#[bench]
fn bench_decrypt_16(b: &mut Bencher) {
bench_decrypt(b, &[!0; 16], &[!0; 16])
}
#[bench]
fn bench_decrypt_4k(b: &mut Bencher) {
bench_decrypt(b, &[!0; 16], &[!0; 4096])
}
#[bench]
fn bench_decrypt_64k(b: &mut Bencher) {
bench_decrypt(b, &[!0; 16], &[!0; 65536])
}
}

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// Copyright 2016 chacha20-poly1305-aead Developers
//
// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
// http://opensource.org/licenses/MIT>, at your option. This file may not be
// copied, modified, or distributed except according to those terms.
use std::mem;
use std::slice;
pub unsafe trait Safe {}
pub trait AsBytes {
fn as_bytes(&self) -> &[u8];
fn as_mut_bytes(&mut self) -> &mut [u8];
}
impl<T: Safe> AsBytes for [T] {
#[inline]
fn as_bytes(&self) -> &[u8] {
unsafe {
slice::from_raw_parts(self.as_ptr() as *const u8,
self.len() * mem::size_of::<T>())
}
}
#[inline]
fn as_mut_bytes(&mut self) -> &mut [u8] {
unsafe {
slice::from_raw_parts_mut(self.as_mut_ptr() as *mut u8,
self.len() * mem::size_of::<T>())
}
}
}
unsafe impl Safe for u8 {}
unsafe impl Safe for u16 {}
unsafe impl Safe for u32 {}
unsafe impl Safe for u64 {}
unsafe impl Safe for i8 {}
unsafe impl Safe for i16 {}
unsafe impl Safe for i32 {}
unsafe impl Safe for i64 {}

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// Copyright 2016 chacha20-poly1305-aead Developers
//
// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
// http://opensource.org/licenses/MIT>, at your option. This file may not be
// copied, modified, or distributed except according to those terms.
use crate::as_bytes::AsBytes;
use crate::simd::{Vector4, u32x4};
#[derive(Clone, Debug)]
pub struct ChaCha20 {
state: [u32x4; 3]
}
#[cfg_attr(feature = "clippy", allow(should_implement_trait))]
impl ChaCha20 {
pub fn new(key: &[u8], nonce: &[u8]) -> Self {
Self::with_counter(key, nonce, 0)
}
pub fn with_counter(key: &[u8], nonce: &[u8], counter: u32) -> Self {
assert!(key.len() == 32);
assert!(nonce.len() == 12);
let mut k = [u32x4::default(); 2];
k.as_mut_bytes().clone_from_slice(key);
let mut n = [0; 3];
n.as_mut_bytes().clone_from_slice(nonce);
ChaCha20 {
state: [
k[0].from_le(),
k[1].from_le(),
u32x4::new(counter.to_le(), n[0], n[1], n[2]).from_le(),
]
}
}
fn round(state: &mut [u32x4; 4]) {
state[0] = state[0].wrapping_add(state[1]);
state[3] = (state[3] ^ state[0]).rotate_left_const(16);
state[2] = state[2].wrapping_add(state[3]);
state[1] = (state[1] ^ state[2]).rotate_left_const(12);
state[0] = state[0].wrapping_add(state[1]);
state[3] = (state[3] ^ state[0]).rotate_left_const(8);
state[2] = state[2].wrapping_add(state[3]);
state[1] = (state[1] ^ state[2]).rotate_left_const(7);
}
fn shuffle(state: &mut [u32x4; 4]) {
state[1] = state[1].shuffle_left_1();
state[2] = state[2].shuffle_left_2();
state[3] = state[3].shuffle_left_3();
}
fn unshuffle(state: &mut [u32x4; 4]) {
state[1] = state[1].shuffle_right_1();
state[2] = state[2].shuffle_right_2();
state[3] = state[3].shuffle_right_3();
}
fn round_pair(state: &mut [u32x4; 4]) {
ChaCha20::round(state);
ChaCha20::shuffle(state);
ChaCha20::round(state);
ChaCha20::unshuffle(state);
}
fn block(&self) -> [u32x4; 4] {
let c = u32x4::new(0x61707865, 0x3320646e, 0x79622d32, 0x6b206574);
let mut state = [c, self.state[0], self.state[1], self.state[2]];
ChaCha20::round_pair(&mut state);
ChaCha20::round_pair(&mut state);
ChaCha20::round_pair(&mut state);
ChaCha20::round_pair(&mut state);
ChaCha20::round_pair(&mut state);
ChaCha20::round_pair(&mut state);
ChaCha20::round_pair(&mut state);
ChaCha20::round_pair(&mut state);
ChaCha20::round_pair(&mut state);
ChaCha20::round_pair(&mut state);
[
state[0].wrapping_add(c).to_le(),
state[1].wrapping_add(self.state[0]).to_le(),
state[2].wrapping_add(self.state[1]).to_le(),
state[3].wrapping_add(self.state[2]).to_le(),
]
}
pub fn next(&mut self) -> [u32x4; 4] {
let block = self.block();
self.state[2].0 = self.state[2].0.wrapping_add(1);
block
}
}
/// Runs the self-test for the chacha20 block function.
#[cold]
pub fn selftest() {
let key = [0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f];
let nonce = [0x00, 0x00, 0x00, 0x09,
0x00, 0x00, 0x00, 0x4a,
0x00, 0x00, 0x00, 0x00];
let expected = [0x10, 0xf1, 0xe7, 0xe4, 0xd1, 0x3b, 0x59, 0x15,
0x50, 0x0f, 0xdd, 0x1f, 0xa3, 0x20, 0x71, 0xc4,
0xc7, 0xd1, 0xf4, 0xc7, 0x33, 0xc0, 0x68, 0x03,
0x04, 0x22, 0xaa, 0x9a, 0xc3, 0xd4, 0x6c, 0x4e,
0xd2, 0x82, 0x64, 0x46, 0x07, 0x9f, 0xaa, 0x09,
0x14, 0xc2, 0xd7, 0x05, 0xd9, 0x8b, 0x02, 0xa2,
0xb5, 0x12, 0x9c, 0xd1, 0xde, 0x16, 0x4e, 0xb9,
0xcb, 0xd0, 0x83, 0xe8, 0xa2, 0x50, 0x3c, 0x4e];
let mut state = ChaCha20::with_counter(&key, &nonce, 1);
let block = state.next();
assert_eq!(block.as_bytes(), &expected[..]);
}
#[cfg(test)]
mod tests {
use as_bytes::AsBytes;
use super::ChaCha20;
#[test]
fn selftest() {
super::selftest();
}
#[test]
fn test_vector_1_and_2() {
let mut state = ChaCha20::new(&[0; 32], &[0; 12]);
assert_eq!(state.next().as_bytes(),
&[0x76, 0xb8, 0xe0, 0xad, 0xa0, 0xf1, 0x3d, 0x90,
0x40, 0x5d, 0x6a, 0xe5, 0x53, 0x86, 0xbd, 0x28,
0xbd, 0xd2, 0x19, 0xb8, 0xa0, 0x8d, 0xed, 0x1a,
0xa8, 0x36, 0xef, 0xcc, 0x8b, 0x77, 0x0d, 0xc7,
0xda, 0x41, 0x59, 0x7c, 0x51, 0x57, 0x48, 0x8d,
0x77, 0x24, 0xe0, 0x3f, 0xb8, 0xd8, 0x4a, 0x37,
0x6a, 0x43, 0xb8, 0xf4, 0x15, 0x18, 0xa1, 0x1c,
0xc3, 0x87, 0xb6, 0x69, 0xb2, 0xee, 0x65, 0x86][..]);
assert_eq!(state.next().as_bytes(),
&[0x9f, 0x07, 0xe7, 0xbe, 0x55, 0x51, 0x38, 0x7a,
0x98, 0xba, 0x97, 0x7c, 0x73, 0x2d, 0x08, 0x0d,
0xcb, 0x0f, 0x29, 0xa0, 0x48, 0xe3, 0x65, 0x69,
0x12, 0xc6, 0x53, 0x3e, 0x32, 0xee, 0x7a, 0xed,
0x29, 0xb7, 0x21, 0x76, 0x9c, 0xe6, 0x4e, 0x43,
0xd5, 0x71, 0x33, 0xb0, 0x74, 0xd8, 0x39, 0xd5,
0x31, 0xed, 0x1f, 0x28, 0x51, 0x0a, 0xfb, 0x45,
0xac, 0xe1, 0x0a, 0x1f, 0x4b, 0x79, 0x4d, 0x6f][..]);
}
#[test]
fn test_vector_3() {
let key = [0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01];
let mut state = ChaCha20::with_counter(&key, &[0; 12], 1);
assert_eq!(state.next().as_bytes(),
&[0x3a, 0xeb, 0x52, 0x24, 0xec, 0xf8, 0x49, 0x92,
0x9b, 0x9d, 0x82, 0x8d, 0xb1, 0xce, 0xd4, 0xdd,
0x83, 0x20, 0x25, 0xe8, 0x01, 0x8b, 0x81, 0x60,
0xb8, 0x22, 0x84, 0xf3, 0xc9, 0x49, 0xaa, 0x5a,
0x8e, 0xca, 0x00, 0xbb, 0xb4, 0xa7, 0x3b, 0xda,
0xd1, 0x92, 0xb5, 0xc4, 0x2f, 0x73, 0xf2, 0xfd,
0x4e, 0x27, 0x36, 0x44, 0xc8, 0xb3, 0x61, 0x25,
0xa6, 0x4a, 0xdd, 0xeb, 0x00, 0x6c, 0x13, 0xa0][..]);
}
#[test]
fn test_vector_4() {
let key = [0x00, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00];
let mut state = ChaCha20::with_counter(&key, &[0; 12], 2);
assert_eq!(state.next().as_bytes(),
&[0x72, 0xd5, 0x4d, 0xfb, 0xf1, 0x2e, 0xc4, 0x4b,
0x36, 0x26, 0x92, 0xdf, 0x94, 0x13, 0x7f, 0x32,
0x8f, 0xea, 0x8d, 0xa7, 0x39, 0x90, 0x26, 0x5e,
0xc1, 0xbb, 0xbe, 0xa1, 0xae, 0x9a, 0xf0, 0xca,
0x13, 0xb2, 0x5a, 0xa2, 0x6c, 0xb4, 0xa6, 0x48,
0xcb, 0x9b, 0x9d, 0x1b, 0xe6, 0x5b, 0x2c, 0x09,
0x24, 0xa6, 0x6c, 0x54, 0xd5, 0x45, 0xec, 0x1b,
0x73, 0x74, 0xf4, 0x87, 0x2e, 0x99, 0xf0, 0x96][..]);
}
#[test]
fn test_vector_5() {
let nonce = [0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x02];
let mut state = ChaCha20::with_counter(&[0; 32], &nonce, 0);
assert_eq!(state.next().as_bytes(),
&[0xc2, 0xc6, 0x4d, 0x37, 0x8c, 0xd5, 0x36, 0x37,
0x4a, 0xe2, 0x04, 0xb9, 0xef, 0x93, 0x3f, 0xcd,
0x1a, 0x8b, 0x22, 0x88, 0xb3, 0xdf, 0xa4, 0x96,
0x72, 0xab, 0x76, 0x5b, 0x54, 0xee, 0x27, 0xc7,
0x8a, 0x97, 0x0e, 0x0e, 0x95, 0x5c, 0x14, 0xf3,
0xa8, 0x8e, 0x74, 0x1b, 0x97, 0xc2, 0x86, 0xf7,
0x5f, 0x8f, 0xc2, 0x99, 0xe8, 0x14, 0x83, 0x62,
0xfa, 0x19, 0x8a, 0x39, 0x53, 0x1b, 0xed, 0x6d][..]);
}
}
#[cfg(all(feature = "bench", test))]
mod bench {
use test::{Bencher, black_box};
use super::ChaCha20;
#[bench]
fn bench_new(b: &mut Bencher) {
let key = [!0; 32];
let nonce = [!0; 12];
let mut counter = 0;
b.bytes = 48;
b.iter(|| {
counter += 1;
ChaCha20::with_counter(black_box(&key), black_box(&nonce), counter)
})
}
#[bench]
fn bench_block(b: &mut Bencher) {
let mut state = ChaCha20::new(&[!0; 32], &[!0; 12]);
b.bytes = 64;
b.iter(|| {
state.next()
})
}
}

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// Copyright 2016 chacha20-poly1305-aead Developers
//
// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
// http://opensource.org/licenses/MIT>, at your option. This file may not be
// copied, modified, or distributed except according to those terms.
//! A pure Rust implementation of the ChaCha20-Poly1305 AEAD from RFC 7539.
//!
//! An Authenticated Encryption with Associated Data (AEAD) mode
//! encrypts data and generates an authentication tag, or decrypts data
//! and verifies an authentication tag, as a single operation. The tag
//! can also validate additional authenticated data (AAD) which is not
//! included in the cyphertext, for instance a plaintext header.
//!
//! The ChaCha20-Poly1305 AEAD uses a 256-bit (32-byte) key, and a
//! 96-bit (12-byte) nonce. For each key, a given nonce should be used
//! only once, otherwise the encryption and authentication can be
//! broken. One way to prevent reuse is for the nonce to contain a
//! sequence number.
//!
//! The amount of data that can be encrypted in a single call is 2^32 - 1
//! blocks of 64 bytes, slightly less than 256 GiB.
#![warn(missing_docs)]
#![cfg_attr(feature = "clippy", feature(plugin))]
#![cfg_attr(feature = "clippy", plugin(clippy))]
#![cfg_attr(feature = "clippy", warn(clippy_pedantic))]
#![cfg_attr(all(feature = "bench", test), feature(test))]
#![cfg_attr(feature = "simd", feature(platform_intrinsics, repr_simd))]
#![cfg_attr(feature = "simd_opt", feature(cfg_target_feature))]
#[cfg(all(feature = "bench", test))]
extern crate test;
extern crate constant_time_eq;
mod as_bytes;
mod simdty;
mod simdint;
mod simdop;
mod simd_opt;
mod simd;
mod chacha20;
mod poly1305;
mod aead;
pub use aead::{DecryptError, decrypt, encrypt, encrypt_read};
/// Runs the self-test for ChaCha20, Poly1305, and the AEAD.
#[cold]
pub fn selftest() {
chacha20::selftest();
poly1305::selftest();
aead::selftest::selftest();
}

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// Copyright 2016 chacha20-poly1305-aead Developers
//
// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
// http://opensource.org/licenses/MIT>, at your option. This file may not be
// copied, modified, or distributed except according to those terms.
// The 130-bit accumulator is split into five 26-bit limbs, with the
// carry between the limbs delayed.
//
// The reduction steps use the following identity:
//
// a×2^n ≡ a×c (mod 2^n−c)
//
// For Poly1305, the identity becomes:
//
// a×2^130 ≡ a×5 (mod 2^130−5)
//
// That is, any limb or carry above 2^130 is multiplied by 5 and added
// back to the lower limbs.
//
// Based on the algorithm from https://github.com/floodyberry/poly1305-donna
#[derive(Clone, Debug)]
pub struct Poly1305 {
/// Accumulator: 5x26-bit
a: [u32; 5],
/// Multiplier: 5x26-bit
r: [u32; 5],
/// Secret key: 4x32-bit
s: [u32; 4],
}
impl Poly1305 {
pub fn new(key: &[u8]) -> Self {
assert!(key.len() == 32);
Poly1305 {
a: [0; 5],
// r &= 0x0ffffffc_0ffffffc_0ffffffc_0fffffff;
r: [u32_from_le(&key[ 0.. 4]) & 0x03ffffff,
u32_from_le(&key[ 3.. 7]) >> 2 & 0x03ffff03,
u32_from_le(&key[ 6..10]) >> 4 & 0x03ffc0ff,
u32_from_le(&key[ 9..13]) >> 6 & 0x03f03fff,
u32_from_le(&key[12..16]) >> 8 & 0x000fffff],
s: [u32_from_le(&key[16..20]),
u32_from_le(&key[20..24]),
u32_from_le(&key[24..28]),
u32_from_le(&key[28..32])],
}
}
pub fn block(&mut self, msg: &[u8]) {
assert!(msg.len() == 16);
self.accumulate(u32_from_le(&msg[ 0.. 4]) & 0x03ffffff,
u32_from_le(&msg[ 3.. 7]) >> 2 & 0x03ffffff,
u32_from_le(&msg[ 6..10]) >> 4 & 0x03ffffff,
u32_from_le(&msg[ 9..13]) >> 6 & 0x03ffffff,
u32_from_le(&msg[12..16]) >> 8 | (1 << 24));
}
pub fn last_block(mut self, msg: &[u8]) -> [u32; 4] {
if !msg.is_empty() {
assert!(msg.len() <= 16);
let mut buf = [0; 17];
buf[..msg.len()].clone_from_slice(msg);
buf[msg.len()] = 1;
self.accumulate(u32_from_le(&buf[ 0.. 4]) & 0x03ffffff,
u32_from_le(&buf[ 3.. 7]) >> 2 & 0x03ffffff,
u32_from_le(&buf[ 6..10]) >> 4 & 0x03ffffff,
u32_from_le(&buf[ 9..13]) >> 6 & 0x03ffffff,
u32_from_le(&buf[13..17]));
}
self.tag()
}
fn padded_block(&mut self, msg: &[u8]) {
assert!(msg.len() <= 16);
let mut buf = [0; 16];
buf[..msg.len()].clone_from_slice(msg);
self.block(&buf);
}
pub fn padded_blocks(&mut self, mut msg: &[u8]) {
while msg.len() >= 16 {
self.block(&msg[..16]);
msg = &msg[16..];
}
if !msg.is_empty() {
self.padded_block(msg);
}
}
fn accumulate(&mut self, n0: u32, n1: u32, n2: u32, n3: u32, n4: u32) {
self.a[0] += n0;
self.a[1] += n1;
self.a[2] += n2;
self.a[3] += n3;
self.a[4] += n4;
self.mul_r_mod_p();
}
#[cfg_attr(feature = "clippy", allow(cast_possible_truncation))]
fn mul_r_mod_p(&mut self) {
// t = r * a; high limbs multiplied by 5 and added to low limbs
let mut t = [0; 5];
t[0] += self.r[0] as u64 * self.a[0] as u64;
t[1] += self.r[0] as u64 * self.a[1] as u64;
t[2] += self.r[0] as u64 * self.a[2] as u64;
t[3] += self.r[0] as u64 * self.a[3] as u64;
t[4] += self.r[0] as u64 * self.a[4] as u64;
t[0] += (5 * self.r[1]) as u64 * self.a[4] as u64;
t[1] += self.r[1] as u64 * self.a[0] as u64;
t[2] += self.r[1] as u64 * self.a[1] as u64;
t[3] += self.r[1] as u64 * self.a[2] as u64;
t[4] += self.r[1] as u64 * self.a[3] as u64;
t[0] += (5 * self.r[2]) as u64 * self.a[3] as u64;
t[1] += (5 * self.r[2]) as u64 * self.a[4] as u64;
t[2] += self.r[2] as u64 * self.a[0] as u64;
t[3] += self.r[2] as u64 * self.a[1] as u64;
t[4] += self.r[2] as u64 * self.a[2] as u64;
t[0] += (5 * self.r[3]) as u64 * self.a[2] as u64;
t[1] += (5 * self.r[3]) as u64 * self.a[3] as u64;
t[2] += (5 * self.r[3]) as u64 * self.a[4] as u64;
t[3] += self.r[3] as u64 * self.a[0] as u64;
t[4] += self.r[3] as u64 * self.a[1] as u64;
t[0] += (5 * self.r[4]) as u64 * self.a[1] as u64;
t[1] += (5 * self.r[4]) as u64 * self.a[2] as u64;
t[2] += (5 * self.r[4]) as u64 * self.a[3] as u64;
t[3] += (5 * self.r[4]) as u64 * self.a[4] as u64;
t[4] += self.r[4] as u64 * self.a[0] as u64;
// propagate carries
t[1] += t[0] >> 26;
t[2] += t[1] >> 26;
t[3] += t[2] >> 26;
t[4] += t[3] >> 26;
// mask out carries
self.a[0] = t[0] as u32 & 0x03ffffff;
self.a[1] = t[1] as u32 & 0x03ffffff;
self.a[2] = t[2] as u32 & 0x03ffffff;
self.a[3] = t[3] as u32 & 0x03ffffff;
self.a[4] = t[4] as u32 & 0x03ffffff;
// propagate high limb carry
self.a[0] += (t[4] >> 26) as u32 * 5;
self.a[1] += self.a[0] >> 26;
// mask out carries
self.a[0] &= 0x03ffffff;
// A carry of at most 1 bit has been left in self.a[1]
}
fn propagate_carries(&mut self) {
// propagate carries
self.a[2] += self.a[1] >> 26;
self.a[3] += self.a[2] >> 26;
self.a[4] += self.a[3] >> 26;
self.a[0] += (self.a[4] >> 26) * 5;
self.a[1] += self.a[0] >> 26;
// mask out carries
self.a[0] &= 0x03ffffff;
self.a[1] &= 0x03ffffff;
self.a[2] &= 0x03ffffff;
self.a[3] &= 0x03ffffff;
self.a[4] &= 0x03ffffff;
}
fn reduce_mod_p(&mut self) {
self.propagate_carries();
let mut t = self.a;
// t = a - p
t[0] += 5;
t[4] = t[4].wrapping_sub(1 << 26);
// propagate carries
t[1] += t[0] >> 26;
t[2] += t[1] >> 26;
t[3] += t[2] >> 26;
t[4] = t[4].wrapping_add(t[3] >> 26);
// mask out carries
t[0] &= 0x03ffffff;
t[1] &= 0x03ffffff;
t[2] &= 0x03ffffff;
t[3] &= 0x03ffffff;
// constant-time select between (a - p) if non-negative, (a) otherwise
let mask = (t[4] >> 31).wrapping_sub(1);
self.a[0] = t[0] & mask | self.a[0] & !mask;
self.a[1] = t[1] & mask | self.a[1] & !mask;
self.a[2] = t[2] & mask | self.a[2] & !mask;
self.a[3] = t[3] & mask | self.a[3] & !mask;
self.a[4] = t[4] & mask | self.a[4] & !mask;
}
#[cfg_attr(feature = "clippy", allow(cast_possible_truncation))]
pub fn tag(mut self) -> [u32; 4] {
self.reduce_mod_p();
// convert from 5x26-bit to 4x32-bit
let a = [self.a[0] | self.a[1] << 26,
self.a[1] >> 6 | self.a[2] << 20,
self.a[2] >> 12 | self.a[3] << 14,
self.a[3] >> 18 | self.a[4] << 8];
// t = a + s
let mut t = [a[0] as u64 + self.s[0] as u64,
a[1] as u64 + self.s[1] as u64,
a[2] as u64 + self.s[2] as u64,
a[3] as u64 + self.s[3] as u64];
// propagate carries
t[1] += t[0] >> 32;
t[2] += t[1] >> 32;
t[3] += t[2] >> 32;
// mask out carries
[(t[0] as u32).to_le(),
(t[1] as u32).to_le(),
(t[2] as u32).to_le(),
(t[3] as u32).to_le()]
}
}
#[inline]
fn u32_from_le(src: &[u8]) -> u32 {
use std::mem::size_of;
use std::ptr::copy_nonoverlapping;
assert!(src.len() == size_of::<u32>());
unsafe {
let mut value = 0;
copy_nonoverlapping(src.as_ptr(),
&mut value as *mut u32 as *mut u8,
size_of::<u32>());
u32::from_le(value)
}
}
/// Runs the self-test for the poly1305 authenticator.
#[cold]
pub fn selftest() {
use crate::as_bytes::AsBytes;
let key = [0x85, 0xd6, 0xbe, 0x78, 0x57, 0x55, 0x6d, 0x33,
0x7f, 0x44, 0x52, 0xfe, 0x42, 0xd5, 0x06, 0xa8,
0x01, 0x03, 0x80, 0x8a, 0xfb, 0x0d, 0xb2, 0xfd,
0x4a, 0xbf, 0xf6, 0xaf, 0x41, 0x49, 0xf5, 0x1b];
let msg = b"Cryptographic Forum Research Group";
let expected = [0xa8, 0x06, 0x1d, 0xc1, 0x30, 0x51, 0x36, 0xc6,
0xc2, 0x2b, 0x8b, 0xaf, 0x0c, 0x01, 0x27, 0xa9];
let mut state = Poly1305::new(&key);
state.block(&msg[ 0..16]);
state.block(&msg[16..32]);
let tag = state.last_block(&msg[32..]);
assert_eq!(tag.as_bytes(), expected);
}
#[cfg(test)]
mod tests {
use as_bytes::AsBytes;
use super::Poly1305;
#[test]
fn selftest() {
super::selftest();
}
#[test]
fn test_vector_1() {
let mut state = Poly1305::new(&[0; 32]);
state.block(&[0; 16]);
state.block(&[0; 16]);
state.block(&[0; 16]);
state.block(&[0; 16]);
assert_eq!(state.tag().as_bytes(), &[0; 16]);
}
static TEXT: &'static [u8] = b"\
Any submission to the IETF intended by the Contributor for publi\
cation as all or part of an IETF Internet-Draft or RFC and any s\
tatement made within the context of an IETF activity is consider\
ed an \"IETF Contribution\". Such statements include oral statemen\
ts in IETF sessions, as well as written and electronic communica\
tions made at any time or place, which are addressed to";
#[test]
fn test_vector_2() {
let key = [0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x36, 0xe5, 0xf6, 0xb5, 0xc5, 0xe0, 0x60, 0x70,
0xf0, 0xef, 0xca, 0x96, 0x22, 0x7a, 0x86, 0x3e];
let mut msg = TEXT;
let mut state = Poly1305::new(&key);
while msg.len() >= 16 {
state.block(&msg[..16]);
msg = &msg[16..];
}
let tag = state.last_block(msg);
assert_eq!(tag.as_bytes(),
&[0x36, 0xe5, 0xf6, 0xb5, 0xc5, 0xe0, 0x60, 0x70,
0xf0, 0xef, 0xca, 0x96, 0x22, 0x7a, 0x86, 0x3e]);
}
#[test]
fn test_vector_3() {
let key = [0x36, 0xe5, 0xf6, 0xb5, 0xc5, 0xe0, 0x60, 0x70,
0xf0, 0xef, 0xca, 0x96, 0x22, 0x7a, 0x86, 0x3e,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00];
let mut msg = TEXT;
let mut state = Poly1305::new(&key);
while msg.len() >= 16 {
state.block(&msg[..16]);
msg = &msg[16..];
}
let tag = state.last_block(msg);
assert_eq!(tag.as_bytes(),
&[0xf3, 0x47, 0x7e, 0x7c, 0xd9, 0x54, 0x17, 0xaf,
0x89, 0xa6, 0xb8, 0x79, 0x4c, 0x31, 0x0c, 0xf0]);
}
#[test]
fn test_vector_4() {
let key = [0x1c, 0x92, 0x40, 0xa5, 0xeb, 0x55, 0xd3, 0x8a,
0xf3, 0x33, 0x88, 0x86, 0x04, 0xf6, 0xb5, 0xf0,
0x47, 0x39, 0x17, 0xc1, 0x40, 0x2b, 0x80, 0x09,
0x9d, 0xca, 0x5c, 0xbc, 0x20, 0x70, 0x75, 0xc0];
let mut msg: &[u8] = b"\
'Twas brillig, and the slithy toves\nDid gyre and gimble in the w\
abe:\nAll mimsy were the borogoves,\nAnd the mome raths outgrabe.";
let mut state = Poly1305::new(&key);
while msg.len() >= 16 {
state.block(&msg[..16]);
msg = &msg[16..];
}
let tag = state.last_block(msg);
assert_eq!(tag.as_bytes(),
&[0x45, 0x41, 0x66, 0x9a, 0x7e, 0xaa, 0xee, 0x61,
0xe7, 0x08, 0xdc, 0x7c, 0xbc, 0xc5, 0xeb, 0x62]);
}
#[test]
fn test_vector_5() {
let key = [0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00];
let mut state = Poly1305::new(&key);
state.block(&[0xff; 16]);
assert_eq!(state.tag().as_bytes(),
&[0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]);
}
#[test]
fn test_vector_6() {
let key = [0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff];
let mut state = Poly1305::new(&key);
state.block(&[0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]);
assert_eq!(state.tag().as_bytes(),
&[0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]);
}
#[test]
fn test_vector_7() {
let key = [0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00];
let mut state = Poly1305::new(&key);
state.block(&[0xff; 16]);
state.block(&[0xf0, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff]);
state.block(&[0x11, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]);
assert_eq!(state.tag().as_bytes(),
&[0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]);
}
#[test]
fn test_vector_8() {
let key = [0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00];
let mut state = Poly1305::new(&key);
state.block(&[0xff; 16]);
state.block(&[0xfb, 0xfe, 0xfe, 0xfe, 0xfe, 0xfe, 0xfe, 0xfe,
0xfe, 0xfe, 0xfe, 0xfe, 0xfe, 0xfe, 0xfe, 0xfe]);
state.block(&[0x01; 16]);
assert_eq!(state.tag().as_bytes(), &[0; 16]);
}
#[test]
fn test_vector_9() {
let key = [0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00];
let mut state = Poly1305::new(&key);
state.block(&[0xfd, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff]);
assert_eq!(state.tag().as_bytes(),
&[0xfa, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff]);
}
#[test]
fn test_vector_10() {
let key = [0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00];
let mut state = Poly1305::new(&key);
state.block(&[0xe3, 0x35, 0x94, 0xd7, 0x50, 0x5e, 0x43, 0xb9,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]);
state.block(&[0x33, 0x94, 0xd7, 0x50, 0x5e, 0x43, 0x79, 0xcd,
0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]);
state.block(&[0; 16]);
state.block(&[0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]);
assert_eq!(state.tag().as_bytes(),
&[0x14, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x55, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]);
}
#[test]
fn test_vector_11() {
let key = [0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00];
let mut state = Poly1305::new(&key);
state.block(&[0xe3, 0x35, 0x94, 0xd7, 0x50, 0x5e, 0x43, 0xb9,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]);
state.block(&[0x33, 0x94, 0xd7, 0x50, 0x5e, 0x43, 0x79, 0xcd,
0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]);
state.block(&[0; 16]);
assert_eq!(state.tag().as_bytes(),
&[0x13, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]);
}
}
#[cfg(all(feature = "bench", test))]
mod bench {
use test::{Bencher, black_box};
use super::Poly1305;
#[bench]
fn bench_new(b: &mut Bencher) {
let key = [!0; 32];
b.bytes = 32;
b.iter(|| {
Poly1305::new(black_box(&key))
})
}
#[bench]
fn bench_block(b: &mut Bencher) {
let mut state = Poly1305::new(&[!0; 32]);
let msg = [!0; 16];
b.bytes = 16;
b.iter(|| {
black_box(&mut state).block(black_box(&msg))
})
}
#[bench]
fn bench_last_block(b: &mut Bencher) {
let state = Poly1305::new(&[!0; 32]);
let msg = [!0; 16];
b.bytes = 16;
b.iter(|| {
black_box(&state).clone().last_block(black_box(&msg))
})
}
#[bench]
fn bench_tag(b: &mut Bencher) {
let state = Poly1305::new(&[!0; 32]);
b.bytes = 16;
b.iter(|| {
black_box(&state).clone().tag()
})
}
}

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// Copyright 2015 chacha20-poly1305-aead Developers
//
// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
// http://opensource.org/licenses/MIT>, at your option. This file may not be
// copied, modified, or distributed except according to those terms.
#![cfg_attr(feature = "clippy", allow(inline_always))]
use crate::simd_opt;
pub use crate::simdty::u32x4;
pub trait Vector4<T>: Copy {
fn from_le(self) -> Self;
fn to_le(self) -> Self;
fn wrapping_add(self, rhs: Self) -> Self;
fn rotate_left_const(self, n: u32) -> Self;
fn shuffle_left_1(self) -> Self;
fn shuffle_left_2(self) -> Self;
fn shuffle_left_3(self) -> Self;
#[inline(always)] fn shuffle_right_1(self) -> Self { self.shuffle_left_3() }
#[inline(always)] fn shuffle_right_2(self) -> Self { self.shuffle_left_2() }
#[inline(always)] fn shuffle_right_3(self) -> Self { self.shuffle_left_1() }
}
macro_rules! impl_vector4 {
($vec:ident, $word:ident) => {
impl Vector4<$word> for $vec {
#[cfg(target_endian = "little")]
#[inline(always)]
fn from_le(self) -> Self { self }
#[cfg(not(target_endian = "little"))]
#[inline(always)]
fn from_le(self) -> Self {
$vec::new($word::from_le(self.0),
$word::from_le(self.1),
$word::from_le(self.2),
$word::from_le(self.3))
}
#[cfg(target_endian = "little")]
#[inline(always)]
fn to_le(self) -> Self { self }
#[cfg(not(target_endian = "little"))]
#[inline(always)]
fn to_le(self) -> Self {
$vec::new(self.0.to_le(),
self.1.to_le(),
self.2.to_le(),
self.3.to_le())
}
#[inline(always)]
fn wrapping_add(self, rhs: Self) -> Self { self + rhs }
#[inline(always)]
fn rotate_left_const(self, n: u32) -> Self {
simd_opt::$vec::rotate_left_const(self, n)
}
#[cfg(feature = "simd")]
#[inline(always)]
fn shuffle_left_1(self) -> Self {
use simdint::simd_shuffle4;
unsafe { simd_shuffle4(self, self, [1, 2, 3, 0]) }
}
#[cfg(not(feature = "simd"))]
#[inline(always)]
fn shuffle_left_1(self) -> Self {
$vec::new(self.1, self.2, self.3, self.0)
}
#[cfg(feature = "simd")]
#[inline(always)]
fn shuffle_left_2(self) -> Self {
use simdint::simd_shuffle4;
unsafe { simd_shuffle4(self, self, [2, 3, 0, 1]) }
}
#[cfg(not(feature = "simd"))]
#[inline(always)]
fn shuffle_left_2(self) -> Self {
$vec::new(self.2, self.3, self.0, self.1)
}
#[cfg(feature = "simd")]
#[inline(always)]
fn shuffle_left_3(self) -> Self {
use simdint::simd_shuffle4;
unsafe { simd_shuffle4(self, self, [3, 0, 1, 2]) }
}
#[cfg(not(feature = "simd"))]
#[inline(always)]
fn shuffle_left_3(self) -> Self {
$vec::new(self.3, self.0, self.1, self.2)
}
}
}
}
impl_vector4!(u32x4, u32);

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// Copyright 2015 chacha20-poly1305-aead Developers
//
// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
// http://opensource.org/licenses/MIT>, at your option. This file may not be
// copied, modified, or distributed except according to those terms.
#![cfg_attr(feature = "clippy", allow(inline_always))]
#[cfg(feature = "simd")]
macro_rules! transmute_shuffle {
($tmp:ident, $shuffle:ident, $vec:expr, $idx:expr) => {
unsafe {
use simdty::$tmp;
use simdint::$shuffle;
use std::mem::transmute;
let tmp_i: $tmp = transmute($vec);
let tmp_o: $tmp = $shuffle(tmp_i, tmp_i, $idx);
transmute(tmp_o)
}
}
}
#[cfg(feature = "simd")] pub mod u32x4;
#[cfg(not(feature = "simd"))]
macro_rules! simd_opt {
($vec:ident) => {
pub mod $vec {
use crate::simdty::$vec;
#[inline(always)]
pub fn rotate_left_const(vec: $vec, n: u32) -> $vec {
$vec::new(vec.0.rotate_left(n),
vec.1.rotate_left(n),
vec.2.rotate_left(n),
vec.3.rotate_left(n))
}
}
}
}
#[cfg(not(feature = "simd"))] simd_opt!(u32x4);

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// Copyright 2015 chacha20-poly1305-aead Developers
//
// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
// http://opensource.org/licenses/MIT>, at your option. This file may not be
// copied, modified, or distributed except according to those terms.
#![cfg_attr(feature = "clippy", allow(inline_always))]
use crate::simdty::u32x4;
#[cfg(feature = "simd_opt")]
#[inline(always)]
pub fn rotate_left_const(vec: u32x4, n: u32) -> u32x4 {
match n {
16 => rotate_left_16(vec),
8 => rotate_left_8(vec),
_ => rotate_left_any(vec, n),
}
}
#[cfg(not(feature = "simd_opt"))]
#[inline(always)]
pub fn rotate_left_const(vec: u32x4, n: u32) -> u32x4 {
rotate_left_any(vec, n)
}
#[inline(always)]
fn rotate_left_any(vec: u32x4, n: u32) -> u32x4 {
let l = n as u32;
let r = 32 - l;
(vec << u32x4::new(l, l, l, l)) ^ (vec >> u32x4::new(r, r, r, r))
}
#[cfg(feature = "simd_opt")]
#[inline(always)]
fn rotate_left_16(vec: u32x4) -> u32x4 {
if cfg!(target_feature = "ssse3") {
// pshufb (SSSE3) / vpshufb (AVX2)
transmute_shuffle!(u8x16, simd_shuffle16, vec,
[ 2, 3, 0, 1,
6, 7, 4, 5,
10, 11, 8, 9,
14, 15, 12, 13])
} else if cfg!(any(target_feature = "sse2", target_feature = "neon")) {
// pshuflw+pshufhw (SSE2) / vrev (NEON)
transmute_shuffle!(u16x8, simd_shuffle8, vec,
[1, 0,
3, 2,
5, 4,
7, 6])
} else {
rotate_left_any(vec, 16)
}
}
#[cfg(feature = "simd_opt")]
#[inline(always)]
fn rotate_left_8(vec: u32x4) -> u32x4 {
if cfg!(target_feature = "ssse3") {
// pshufb (SSSE3) / vpshufb (AVX2)
transmute_shuffle!(u8x16, simd_shuffle16, vec,
[ 3, 0, 1, 2,
7, 4, 5, 6,
11, 8, 9, 10,
15, 12, 13, 14])
} else {
rotate_left_any(vec, 8)
}
}

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// Copyright 2015 chacha20-poly1305-aead Developers
//
// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
// http://opensource.org/licenses/MIT>, at your option. This file may not be
// copied, modified, or distributed except according to those terms.
#![allow(dead_code)]
#[cfg(feature = "simd")]
extern "platform-intrinsic" {
pub fn simd_add<T>(x: T, y: T) -> T;
pub fn simd_shl<T>(x: T, y: T) -> T;
pub fn simd_shr<T>(x: T, y: T) -> T;
pub fn simd_xor<T>(x: T, y: T) -> T;
pub fn simd_shuffle4<T, U>(v: T, w: T, idx: [u32; 4]) -> U;
pub fn simd_shuffle8<T, U>(v: T, w: T, idx: [u32; 8]) -> U;
pub fn simd_shuffle16<T, U>(v: T, w: T, idx: [u32; 16]) -> U;
}

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// Copyright 2015 chacha20-poly1305-aead Developers
//
// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
// http://opensource.org/licenses/MIT>, at your option. This file may not be
// copied, modified, or distributed except according to those terms.
use crate::simdty::u32x4;
#[cfg(feature = "simd")] use crate::simdint;
use std::ops::{Add, BitXor, Shl, Shr};
macro_rules! impl_ops {
($vec:ident) => {
impl Add for $vec {
type Output = Self;
#[cfg(feature = "simd")]
#[inline(always)]
fn add(self, rhs: Self) -> Self::Output {
unsafe { simdint::simd_add(self, rhs) }
}
#[cfg(not(feature = "simd"))]
#[inline(always)]
fn add(self, rhs: Self) -> Self::Output {
$vec::new(self.0.wrapping_add(rhs.0),
self.1.wrapping_add(rhs.1),
self.2.wrapping_add(rhs.2),
self.3.wrapping_add(rhs.3))
}
}
impl BitXor for $vec {
type Output = Self;
#[cfg(feature = "simd")]
#[inline(always)]
fn bitxor(self, rhs: Self) -> Self::Output {
unsafe { simdint::simd_xor(self, rhs) }
}
#[cfg(not(feature = "simd"))]
#[inline(always)]
fn bitxor(self, rhs: Self) -> Self::Output {
$vec::new(self.0 ^ rhs.0,
self.1 ^ rhs.1,
self.2 ^ rhs.2,
self.3 ^ rhs.3)
}
}
impl Shl<$vec> for $vec {
type Output = Self;
#[cfg(feature = "simd")]
#[inline(always)]
fn shl(self, rhs: Self) -> Self::Output {
unsafe { simdint::simd_shl(self, rhs) }
}
#[cfg(not(feature = "simd"))]
#[inline(always)]
fn shl(self, rhs: Self) -> Self::Output {
$vec::new(self.0 << rhs.0,
self.1 << rhs.1,
self.2 << rhs.2,
self.3 << rhs.3)
}
}
impl Shr<$vec> for $vec {
type Output = Self;
#[cfg(feature = "simd")]
#[inline(always)]
fn shr(self, rhs: Self) -> Self::Output {
unsafe { simdint::simd_shr(self, rhs) }
}
#[cfg(not(feature = "simd"))]
#[inline(always)]
fn shr(self, rhs: Self) -> Self::Output {
$vec::new(self.0 >> rhs.0,
self.1 >> rhs.1,
self.2 >> rhs.2,
self.3 >> rhs.3)
}
}
}
}
impl_ops!(u32x4);

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// Copyright 2016 chacha20-poly1305-aead Developers
//
// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
// http://opensource.org/licenses/MIT>, at your option. This file may not be
// copied, modified, or distributed except according to those terms.
#![allow(dead_code)]
#![allow(non_camel_case_types)]
use crate::as_bytes::Safe;
#[cfg(feature = "simd")]
macro_rules! decl_simd {
($($decl:item)*) => {
$(
#[derive(Clone, Copy, Debug, Default)]
#[repr(simd)]
$decl
)*
}
}
#[cfg(not(feature = "simd"))]
macro_rules! decl_simd {
($($decl:item)*) => {
$(
#[derive(Clone, Copy, Debug, Default)]
#[repr(C)]
$decl
)*
}
}
decl_simd! {
pub struct Simd4<T>(pub T, pub T, pub T, pub T);
pub struct Simd8<T>(pub T, pub T, pub T, pub T,
pub T, pub T, pub T, pub T);
pub struct Simd16<T>(pub T, pub T, pub T, pub T,
pub T, pub T, pub T, pub T,
pub T, pub T, pub T, pub T,
pub T, pub T, pub T, pub T);
}
pub type u32x4 = Simd4<u32>;
pub type u16x8 = Simd8<u16>;
pub type u8x16 = Simd16<u8>;
#[cfg_attr(feature = "clippy", allow(inline_always))]
impl<T> Simd4<T> {
#[inline(always)]
pub fn new(e0: T, e1: T, e2: T, e3: T) -> Simd4<T> {
Simd4(e0, e1, e2, e3)
}
}
unsafe impl<T: Safe> Safe for Simd4<T> {}
unsafe impl<T: Safe> Safe for Simd8<T> {}
unsafe impl<T: Safe> Safe for Simd16<T> {}