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use super::{get_der_key, IPAD, OPAD};
use core::{fmt, slice};
#[cfg(feature = "reset")]
use digest::Reset;
use digest::{
block_buffer::Eager,
core_api::{
AlgorithmName, Block, BlockSizeUser, Buffer, BufferKindUser, CoreProxy, CoreWrapper,
FixedOutputCore, OutputSizeUser, UpdateCore,
},
crypto_common::{Key, KeySizeUser},
generic_array::typenum::{IsLess, Le, NonZero, U256},
HashMarker, InvalidLength, KeyInit, MacMarker, Output,
};
/// Generic HMAC instance.
pub type Hmac<D> = CoreWrapper<HmacCore<D>>;
/// Generic core HMAC instance, which operates over blocks.
pub struct HmacCore<D>
where
D: CoreProxy,
D::Core: HashMarker
+ UpdateCore
+ FixedOutputCore
+ BufferKindUser<BufferKind = Eager>
+ Default
+ Clone,
<D::Core as BlockSizeUser>::BlockSize: IsLess<U256>,
Le<<D::Core as BlockSizeUser>::BlockSize, U256>: NonZero,
{
digest: D::Core,
opad_digest: D::Core,
#[cfg(feature = "reset")]
ipad_digest: D::Core,
}
impl<D> Clone for HmacCore<D>
where
D: CoreProxy,
D::Core: HashMarker
+ UpdateCore
+ FixedOutputCore
+ BufferKindUser<BufferKind = Eager>
+ Default
+ Clone,
<D::Core as BlockSizeUser>::BlockSize: IsLess<U256>,
Le<<D::Core as BlockSizeUser>::BlockSize, U256>: NonZero,
{
fn clone(&self) -> Self {
Self {
digest: self.digest.clone(),
opad_digest: self.opad_digest.clone(),
#[cfg(feature = "reset")]
ipad_digest: self.ipad_digest.clone(),
}
}
}
impl<D> MacMarker for HmacCore<D>
where
D: CoreProxy,
D::Core: HashMarker
+ UpdateCore
+ FixedOutputCore
+ BufferKindUser<BufferKind = Eager>
+ Default
+ Clone,
<D::Core as BlockSizeUser>::BlockSize: IsLess<U256>,
Le<<D::Core as BlockSizeUser>::BlockSize, U256>: NonZero,
{
}
impl<D> BufferKindUser for HmacCore<D>
where
D: CoreProxy,
D::Core: HashMarker
+ UpdateCore
+ FixedOutputCore
+ BufferKindUser<BufferKind = Eager>
+ Default
+ Clone,
<D::Core as BlockSizeUser>::BlockSize: IsLess<U256>,
Le<<D::Core as BlockSizeUser>::BlockSize, U256>: NonZero,
{
type BufferKind = Eager;
}
impl<D> KeySizeUser for HmacCore<D>
where
D: CoreProxy,
D::Core: HashMarker
+ UpdateCore
+ FixedOutputCore
+ BufferKindUser<BufferKind = Eager>
+ Default
+ Clone,
<D::Core as BlockSizeUser>::BlockSize: IsLess<U256>,
Le<<D::Core as BlockSizeUser>::BlockSize, U256>: NonZero,
{
type KeySize = <<D as CoreProxy>::Core as BlockSizeUser>::BlockSize;
}
impl<D> BlockSizeUser for HmacCore<D>
where
D: CoreProxy,
D::Core: HashMarker
+ UpdateCore
+ FixedOutputCore
+ BufferKindUser<BufferKind = Eager>
+ Default
+ Clone,
<D::Core as BlockSizeUser>::BlockSize: IsLess<U256>,
Le<<D::Core as BlockSizeUser>::BlockSize, U256>: NonZero,
{
type BlockSize = <<D as CoreProxy>::Core as BlockSizeUser>::BlockSize;
}
impl<D> OutputSizeUser for HmacCore<D>
where
D: CoreProxy,
D::Core: HashMarker
+ UpdateCore
+ FixedOutputCore
+ BufferKindUser<BufferKind = Eager>
+ Default
+ Clone,
<D::Core as BlockSizeUser>::BlockSize: IsLess<U256>,
Le<<D::Core as BlockSizeUser>::BlockSize, U256>: NonZero,
{
type OutputSize = <<D as CoreProxy>::Core as OutputSizeUser>::OutputSize;
}
impl<D> KeyInit for HmacCore<D>
where
D: CoreProxy,
D::Core: HashMarker
+ UpdateCore
+ FixedOutputCore
+ BufferKindUser<BufferKind = Eager>
+ Default
+ Clone,
<D::Core as BlockSizeUser>::BlockSize: IsLess<U256>,
Le<<D::Core as BlockSizeUser>::BlockSize, U256>: NonZero,
{
#[inline(always)]
fn new(key: &Key<Self>) -> Self {
Self::new_from_slice(key.as_slice()).unwrap()
}
#[inline(always)]
fn new_from_slice(key: &[u8]) -> Result<Self, InvalidLength> {
let mut buf = get_der_key::<CoreWrapper<D::Core>>(key);
for b in buf.iter_mut() {
*b ^= IPAD;
}
let mut digest = D::Core::default();
digest.update_blocks(slice::from_ref(&buf));
for b in buf.iter_mut() {
*b ^= IPAD ^ OPAD;
}
let mut opad_digest = D::Core::default();
opad_digest.update_blocks(slice::from_ref(&buf));
Ok(Self {
#[cfg(feature = "reset")]
ipad_digest: digest.clone(),
opad_digest,
digest,
})
}
}
impl<D> UpdateCore for HmacCore<D>
where
D: CoreProxy,
D::Core: HashMarker
+ UpdateCore
+ FixedOutputCore
+ BufferKindUser<BufferKind = Eager>
+ Default
+ Clone,
<D::Core as BlockSizeUser>::BlockSize: IsLess<U256>,
Le<<D::Core as BlockSizeUser>::BlockSize, U256>: NonZero,
{
#[inline(always)]
fn update_blocks(&mut self, blocks: &[Block<Self>]) {
self.digest.update_blocks(blocks);
}
}
impl<D> FixedOutputCore for HmacCore<D>
where
D: CoreProxy,
D::Core: HashMarker
+ UpdateCore
+ FixedOutputCore
+ BufferKindUser<BufferKind = Eager>
+ Default
+ Clone,
<D::Core as BlockSizeUser>::BlockSize: IsLess<U256>,
Le<<D::Core as BlockSizeUser>::BlockSize, U256>: NonZero,
{
#[inline(always)]
fn finalize_fixed_core(&mut self, buffer: &mut Buffer<Self>, out: &mut Output<Self>) {
let mut hash = Output::<D::Core>::default();
self.digest.finalize_fixed_core(buffer, &mut hash);
// finalize_fixed_core should reset the buffer as well, but
// to be extra safe we reset it explicitly again.
buffer.reset();
#[cfg(not(feature = "reset"))]
let h = &mut self.opad_digest;
#[cfg(feature = "reset")]
let mut h = self.opad_digest.clone();
buffer.digest_blocks(&hash, |b| h.update_blocks(b));
h.finalize_fixed_core(buffer, out);
}
}
#[cfg(feature = "reset")]
#[cfg_attr(docsrs, doc(cfg(feature = "reset")))]
impl<D> Reset for HmacCore<D>
where
D: CoreProxy,
D::Core: HashMarker
+ UpdateCore
+ FixedOutputCore
+ BufferKindUser<BufferKind = Eager>
+ Default
+ Clone,
<D::Core as BlockSizeUser>::BlockSize: IsLess<U256>,
Le<<D::Core as BlockSizeUser>::BlockSize, U256>: NonZero,
{
#[inline(always)]
fn reset(&mut self) {
self.digest = self.ipad_digest.clone();
}
}
impl<D> AlgorithmName for HmacCore<D>
where
D: CoreProxy,
D::Core: HashMarker
+ AlgorithmName
+ UpdateCore
+ FixedOutputCore
+ BufferKindUser<BufferKind = Eager>
+ Default
+ Clone,
<D::Core as BlockSizeUser>::BlockSize: IsLess<U256>,
Le<<D::Core as BlockSizeUser>::BlockSize, U256>: NonZero,
{
fn write_alg_name(f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str("Hmac<")?;
<D::Core as AlgorithmName>::write_alg_name(f)?;
f.write_str(">")
}
}
impl<D> fmt::Debug for HmacCore<D>
where
D: CoreProxy,
D::Core: HashMarker
+ AlgorithmName
+ UpdateCore
+ FixedOutputCore
+ BufferKindUser<BufferKind = Eager>
+ Default
+ Clone,
<D::Core as BlockSizeUser>::BlockSize: IsLess<U256>,
Le<<D::Core as BlockSizeUser>::BlockSize, U256>: NonZero,
{
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str("HmacCore<")?;
<D::Core as AlgorithmName>::write_alg_name(f)?;
f.write_str("> { ... }")
}
}
|
