384 lines
14 KiB
Rust
384 lines
14 KiB
Rust
// SPDX-License-Identifier: CC0-1.0
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// This module is largely copied from the rust-crypto ripemd.rs file;
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// while rust-crypto is licensed under Apache, that file specifically
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// was written entirely by Andrew Poelstra, who is re-licensing its
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// contents here as CC0.
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//! Hash-based Message Authentication Code (HMAC).
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//!
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use core::{borrow, fmt, ops, str};
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#[cfg(feature = "serde")]
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use serde::{Deserialize, Deserializer, Serialize, Serializer};
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use crate::{Error, Hash, HashEngine};
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/// A hash computed from a RFC 2104 HMAC. Parameterized by the underlying hash function.
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#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
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#[cfg_attr(feature = "schemars", derive(schemars::JsonSchema))]
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#[cfg_attr(feature = "schemars", schemars(transparent))]
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#[repr(transparent)]
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pub struct Hmac<T: Hash>(T);
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impl<T: Hash + str::FromStr> str::FromStr for Hmac<T> {
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type Err = <T as str::FromStr>::Err;
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fn from_str(s: &str) -> Result<Self, Self::Err> { Ok(Hmac(str::FromStr::from_str(s)?)) }
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}
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/// Pair of underlying hash midstates which represent the current state of an `HmacEngine`.
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pub struct HmacMidState<T: Hash> {
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/// Midstate of the inner hash engine
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pub inner: <T::Engine as HashEngine>::MidState,
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/// Midstate of the outer hash engine
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pub outer: <T::Engine as HashEngine>::MidState,
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}
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/// Pair of underyling hash engines, used for the inner and outer hash of HMAC.
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#[derive(Clone)]
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pub struct HmacEngine<T: Hash> {
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iengine: T::Engine,
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oengine: T::Engine,
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}
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impl<T: Hash> Default for HmacEngine<T> {
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fn default() -> Self { HmacEngine::new(&[]) }
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}
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impl<T: Hash> HmacEngine<T> {
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/// Constructs a new keyed HMAC from `key`.
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///
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/// We only support underlying hashes whose block sizes are ≤ 128 bytes.
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///
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/// # Panics
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///
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/// Larger hashes will result in a panic.
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pub fn new(key: &[u8]) -> HmacEngine<T> {
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debug_assert!(T::Engine::BLOCK_SIZE <= 128);
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let mut ipad = [0x36u8; 128];
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let mut opad = [0x5cu8; 128];
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let mut ret = HmacEngine { iengine: <T as Hash>::engine(), oengine: <T as Hash>::engine() };
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if key.len() > T::Engine::BLOCK_SIZE {
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let hash = <T as Hash>::hash(key);
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for (b_i, b_h) in ipad.iter_mut().zip(&hash[..]) {
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*b_i ^= *b_h;
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}
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for (b_o, b_h) in opad.iter_mut().zip(&hash[..]) {
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*b_o ^= *b_h;
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}
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} else {
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for (b_i, b_h) in ipad.iter_mut().zip(key) {
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*b_i ^= *b_h;
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}
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for (b_o, b_h) in opad.iter_mut().zip(key) {
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*b_o ^= *b_h;
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}
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};
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HashEngine::input(&mut ret.iengine, &ipad[..T::Engine::BLOCK_SIZE]);
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HashEngine::input(&mut ret.oengine, &opad[..T::Engine::BLOCK_SIZE]);
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ret
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}
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/// A special constructor giving direct access to the underlying "inner" and "outer" engines.
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pub fn from_inner_engines(iengine: T::Engine, oengine: T::Engine) -> HmacEngine<T> {
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HmacEngine { iengine, oengine }
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}
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}
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impl<T: Hash> HashEngine for HmacEngine<T> {
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type MidState = HmacMidState<T>;
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fn midstate(&self) -> Self::MidState {
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HmacMidState { inner: self.iengine.midstate(), outer: self.oengine.midstate() }
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}
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const BLOCK_SIZE: usize = T::Engine::BLOCK_SIZE;
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fn n_bytes_hashed(&self) -> usize { self.iengine.n_bytes_hashed() }
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fn input(&mut self, buf: &[u8]) { self.iengine.input(buf) }
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}
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impl<T: Hash> fmt::Debug for Hmac<T> {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { fmt::Debug::fmt(&self.0, f) }
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}
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impl<T: Hash> fmt::Display for Hmac<T> {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { fmt::Display::fmt(&self.0, f) }
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}
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impl<T: Hash> fmt::LowerHex for Hmac<T> {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { fmt::LowerHex::fmt(&self.0, f) }
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}
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impl<T: Hash> ops::Index<usize> for Hmac<T> {
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type Output = u8;
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fn index(&self, index: usize) -> &u8 { &self.0[index] }
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}
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impl<T: Hash> ops::Index<ops::Range<usize>> for Hmac<T> {
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type Output = [u8];
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fn index(&self, index: ops::Range<usize>) -> &[u8] { &self.0[index] }
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}
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impl<T: Hash> ops::Index<ops::RangeFrom<usize>> for Hmac<T> {
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type Output = [u8];
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fn index(&self, index: ops::RangeFrom<usize>) -> &[u8] { &self.0[index] }
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}
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impl<T: Hash> ops::Index<ops::RangeTo<usize>> for Hmac<T> {
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type Output = [u8];
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fn index(&self, index: ops::RangeTo<usize>) -> &[u8] { &self.0[index] }
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}
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impl<T: Hash> ops::Index<ops::RangeFull> for Hmac<T> {
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type Output = [u8];
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fn index(&self, index: ops::RangeFull) -> &[u8] { &self.0[index] }
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}
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impl<T: Hash> borrow::Borrow<[u8]> for Hmac<T> {
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fn borrow(&self) -> &[u8] { &self[..] }
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}
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impl<T: Hash> Hash for Hmac<T> {
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type Engine = HmacEngine<T>;
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type Bytes = T::Bytes;
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fn from_engine(mut e: HmacEngine<T>) -> Hmac<T> {
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let ihash = T::from_engine(e.iengine);
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e.oengine.input(&ihash[..]);
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let ohash = T::from_engine(e.oengine);
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Hmac(ohash)
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}
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const LEN: usize = T::LEN;
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fn from_slice(sl: &[u8]) -> Result<Hmac<T>, Error> { T::from_slice(sl).map(Hmac) }
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fn to_byte_array(self) -> Self::Bytes { self.0.to_byte_array() }
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fn as_byte_array(&self) -> &Self::Bytes { self.0.as_byte_array() }
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fn from_byte_array(bytes: T::Bytes) -> Self { Hmac(T::from_byte_array(bytes)) }
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fn all_zeros() -> Self {
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let zeros = T::all_zeros();
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Hmac(zeros)
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}
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}
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#[cfg(feature = "serde")]
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impl<T: Hash + Serialize> Serialize for Hmac<T> {
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fn serialize<S: Serializer>(&self, s: S) -> Result<S::Ok, S::Error> {
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Serialize::serialize(&self.0, s)
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}
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}
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#[cfg(feature = "serde")]
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impl<'de, T: Hash + Deserialize<'de>> Deserialize<'de> for Hmac<T> {
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fn deserialize<D: Deserializer<'de>>(d: D) -> Result<Hmac<T>, D::Error> {
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let bytes = Deserialize::deserialize(d)?;
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Ok(Hmac(bytes))
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}
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}
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#[cfg(test)]
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mod tests {
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#[test]
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#[cfg(feature = "alloc")]
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fn test() {
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use crate::{sha256, Hash, HashEngine, Hmac, HmacEngine};
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#[derive(Clone)]
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struct Test {
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key: Vec<u8>,
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input: Vec<u8>,
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output: Vec<u8>,
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}
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#[rustfmt::skip]
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let tests = vec![
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// Test vectors copied from libsecp256k1
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// Sadly the RFC2104 test vectors all use MD5 as their underlying hash function,
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// which of course this library does not support.
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Test {
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key: vec![ 0x0b; 20],
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input: vec![0x48, 0x69, 0x20, 0x54, 0x68, 0x65, 0x72, 0x65],
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output: vec![
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0xb0, 0x34, 0x4c, 0x61, 0xd8, 0xdb, 0x38, 0x53,
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0x5c, 0xa8, 0xaf, 0xce, 0xaf, 0x0b, 0xf1, 0x2b,
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0x88, 0x1d, 0xc2, 0x00, 0xc9, 0x83, 0x3d, 0xa7,
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0x26, 0xe9, 0x37, 0x6c, 0x2e, 0x32, 0xcf, 0xf7,
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],
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},
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Test {
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key: vec![ 0x4a, 0x65, 0x66, 0x65 ],
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input: vec![
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0x77, 0x68, 0x61, 0x74, 0x20, 0x64, 0x6f, 0x20,
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0x79, 0x61, 0x20, 0x77, 0x61, 0x6e, 0x74, 0x20,
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0x66, 0x6f, 0x72, 0x20, 0x6e, 0x6f, 0x74, 0x68,
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0x69, 0x6e, 0x67, 0x3f,
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],
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output: vec![
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0x5b, 0xdc, 0xc1, 0x46, 0xbf, 0x60, 0x75, 0x4e,
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0x6a, 0x04, 0x24, 0x26, 0x08, 0x95, 0x75, 0xc7,
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0x5a, 0x00, 0x3f, 0x08, 0x9d, 0x27, 0x39, 0x83,
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0x9d, 0xec, 0x58, 0xb9, 0x64, 0xec, 0x38, 0x43,
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],
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},
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Test {
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key: vec![ 0xaa; 20 ],
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input: vec![ 0xdd; 50 ],
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output: vec![
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0x77, 0x3e, 0xa9, 0x1e, 0x36, 0x80, 0x0e, 0x46,
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0x85, 0x4d, 0xb8, 0xeb, 0xd0, 0x91, 0x81, 0xa7,
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0x29, 0x59, 0x09, 0x8b, 0x3e, 0xf8, 0xc1, 0x22,
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0xd9, 0x63, 0x55, 0x14, 0xce, 0xd5, 0x65, 0xfe,
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],
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},
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Test {
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key: vec![
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0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
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0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10,
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0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18,
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0x19
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],
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input: vec![ 0xcd; 50 ],
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output: vec![
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0x82, 0x55, 0x8a, 0x38, 0x9a, 0x44, 0x3c, 0x0e,
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0xa4, 0xcc, 0x81, 0x98, 0x99, 0xf2, 0x08, 0x3a,
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0x85, 0xf0, 0xfa, 0xa3, 0xe5, 0x78, 0xf8, 0x07,
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0x7a, 0x2e, 0x3f, 0xf4, 0x67, 0x29, 0x66, 0x5b,
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],
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},
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Test {
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key: vec! [ 0xaa; 131 ],
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input: vec![
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0x54, 0x65, 0x73, 0x74, 0x20, 0x55, 0x73, 0x69,
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0x6e, 0x67, 0x20, 0x4c, 0x61, 0x72, 0x67, 0x65,
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0x72, 0x20, 0x54, 0x68, 0x61, 0x6e, 0x20, 0x42,
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0x6c, 0x6f, 0x63, 0x6b, 0x2d, 0x53, 0x69, 0x7a,
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0x65, 0x20, 0x4b, 0x65, 0x79, 0x20, 0x2d, 0x20,
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0x48, 0x61, 0x73, 0x68, 0x20, 0x4b, 0x65, 0x79,
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0x20, 0x46, 0x69, 0x72, 0x73, 0x74,
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],
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output: vec![
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0x60, 0xe4, 0x31, 0x59, 0x1e, 0xe0, 0xb6, 0x7f,
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0x0d, 0x8a, 0x26, 0xaa, 0xcb, 0xf5, 0xb7, 0x7f,
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0x8e, 0x0b, 0xc6, 0x21, 0x37, 0x28, 0xc5, 0x14,
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0x05, 0x46, 0x04, 0x0f, 0x0e, 0xe3, 0x7f, 0x54,
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],
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},
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Test {
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key: vec! [ 0xaa; 131 ],
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input: vec![
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0x54, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20,
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0x61, 0x20, 0x74, 0x65, 0x73, 0x74, 0x20, 0x75,
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0x73, 0x69, 0x6e, 0x67, 0x20, 0x61, 0x20, 0x6c,
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0x61, 0x72, 0x67, 0x65, 0x72, 0x20, 0x74, 0x68,
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0x61, 0x6e, 0x20, 0x62, 0x6c, 0x6f, 0x63, 0x6b,
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0x2d, 0x73, 0x69, 0x7a, 0x65, 0x20, 0x6b, 0x65,
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0x79, 0x20, 0x61, 0x6e, 0x64, 0x20, 0x61, 0x20,
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0x6c, 0x61, 0x72, 0x67, 0x65, 0x72, 0x20, 0x74,
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0x68, 0x61, 0x6e, 0x20, 0x62, 0x6c, 0x6f, 0x63,
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0x6b, 0x2d, 0x73, 0x69, 0x7a, 0x65, 0x20, 0x64,
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0x61, 0x74, 0x61, 0x2e, 0x20, 0x54, 0x68, 0x65,
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0x20, 0x6b, 0x65, 0x79, 0x20, 0x6e, 0x65, 0x65,
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0x64, 0x73, 0x20, 0x74, 0x6f, 0x20, 0x62, 0x65,
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0x20, 0x68, 0x61, 0x73, 0x68, 0x65, 0x64, 0x20,
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0x62, 0x65, 0x66, 0x6f, 0x72, 0x65, 0x20, 0x62,
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0x65, 0x69, 0x6e, 0x67, 0x20, 0x75, 0x73, 0x65,
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0x64, 0x20, 0x62, 0x79, 0x20, 0x74, 0x68, 0x65,
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0x20, 0x48, 0x4d, 0x41, 0x43, 0x20, 0x61, 0x6c,
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0x67, 0x6f, 0x72, 0x69, 0x74, 0x68, 0x6d, 0x2e,
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],
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output: vec![
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0x9b, 0x09, 0xff, 0xa7, 0x1b, 0x94, 0x2f, 0xcb,
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0x27, 0x63, 0x5f, 0xbc, 0xd5, 0xb0, 0xe9, 0x44,
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0xbf, 0xdc, 0x63, 0x64, 0x4f, 0x07, 0x13, 0x93,
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0x8a, 0x7f, 0x51, 0x53, 0x5c, 0x3a, 0x35, 0xe2,
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],
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},
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];
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for test in tests {
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let mut engine = HmacEngine::<sha256::Hash>::new(&test.key);
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engine.input(&test.input);
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let hash = Hmac::<sha256::Hash>::from_engine(engine);
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assert_eq!(&hash[..], &test.output[..]);
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assert_eq!(hash.as_byte_array(), test.output.as_slice());
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}
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}
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#[cfg(feature = "serde")]
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#[test]
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fn hmac_sha512_serde() {
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use serde_test::{assert_tokens, Configure, Token};
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use crate::{sha512, Hash, Hmac};
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#[rustfmt::skip]
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static HASH_BYTES: [u8; 64] = [
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0x8b, 0x41, 0xe1, 0xb7, 0x8a, 0xd1, 0x15, 0x21,
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0x11, 0x3c, 0x52, 0xff, 0x18, 0x2a, 0x1b, 0x8e,
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0x0a, 0x19, 0x57, 0x54, 0xaa, 0x52, 0x7f, 0xcd,
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0x00, 0xa4, 0x11, 0x62, 0x0b, 0x46, 0xf2, 0x0f,
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0xff, 0xfb, 0x80, 0x88, 0xcc, 0xf8, 0x54, 0x97,
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0x12, 0x1a, 0xd4, 0x49, 0x9e, 0x08, 0x45, 0xb8,
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0x76, 0xf6, 0xdd, 0x66, 0x40, 0x08, 0x8a, 0x2f,
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0x0b, 0x2d, 0x8a, 0x60, 0x0b, 0xdf, 0x4c, 0x0c,
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];
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let hash = Hmac::<sha512::Hash>::from_slice(&HASH_BYTES).expect("right number of bytes");
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assert_tokens(&hash.compact(), &[Token::BorrowedBytes(&HASH_BYTES[..])]);
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assert_tokens(
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&hash.readable(),
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&[Token::Str(
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"8b41e1b78ad11521113c52ff182a1b8e0a195754aa527fcd00a411620b46f20f\
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fffb8088ccf85497121ad4499e0845b876f6dd6640088a2f0b2d8a600bdf4c0c",
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)],
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);
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}
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}
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#[cfg(bench)]
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mod benches {
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use test::Bencher;
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use crate::{sha256, Hash, HashEngine, Hmac};
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#[bench]
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pub fn hmac_sha256_10(bh: &mut Bencher) {
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let mut engine = Hmac::<sha256::Hash>::engine();
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let bytes = [1u8; 10];
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bh.iter(|| {
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engine.input(&bytes);
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});
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bh.bytes = bytes.len() as u64;
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}
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#[bench]
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pub fn hmac_sha256_1k(bh: &mut Bencher) {
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let mut engine = Hmac::<sha256::Hash>::engine();
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let bytes = [1u8; 1024];
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bh.iter(|| {
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engine.input(&bytes);
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});
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bh.bytes = bytes.len() as u64;
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}
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#[bench]
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pub fn hmac_sha256_64k(bh: &mut Bencher) {
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let mut engine = Hmac::<sha256::Hash>::engine();
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let bytes = [1u8; 65536];
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bh.iter(|| {
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engine.input(&bytes);
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});
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bh.bytes = bytes.len() as u64;
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}
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}
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