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#[cfg(feature = "blake2b_simd")]
use blake2b_simd::blake2bp;
#[cfg(feature = "blake2b_simd")]
use blake2b_simd::Params;
use cfg_if::cfg_if;
#[allow(unused_imports)]
use hmac::{Hmac, Mac, NewMac};
use serde::{Deserialize, Serialize};
#[cfg(feature = "sha2")]
use sha2::Sha256;
#[cfg(feature = "sha3")]
use sha3::Sha3_256;
use crate::repository::Key;
use std::cmp::min;
#[cfg(not(any(
feature = "blake2b_simd",
feature = "sha2",
feature = "sha3",
feature = "blake3"
)))]
compile_error!("Asuran requires at least one HMAC algorithim to be enabled.");
#[cfg(feature = "sha2")]
type HmacSha256 = Hmac<Sha256>;
#[cfg(feature = "sha3")]
type HmacSHA3 = Hmac<Sha3_256>;
#[derive(Deserialize, Serialize, Copy, Clone, Debug, PartialEq, Eq, Hash)]
pub enum HMAC {
SHA256,
Blake2b,
Blake2bp,
Blake3,
SHA3,
}
impl HMAC {
#[allow(unused_variables)]
fn internal_mac(self, data: &[u8], key: &[u8]) -> Vec<u8> {
match self {
HMAC::SHA256 => {
cfg_if! {
if #[cfg(feature = "sha2")] {
let mut mac = HmacSha256::new_from_slice(key)
.expect("HmacSHA256 was provided with a key of invalid length.");
mac.update(data);
mac.finalize().into_bytes().as_slice().to_vec()
} else {
unimplemented!("Asuran was not compiled with SHA2 support")
}
}
}
HMAC::Blake2b => {
cfg_if! {
if #[cfg(feature = "blake2b_simd")] {
Params::new()
.hash_length(64)
.key(key)
.hash(data)
.as_bytes()
.to_vec()
} else {
unimplemented!("Asuran was not compiled with BLAKE2b support")
}
}
}
HMAC::Blake2bp => {
cfg_if! {
if #[cfg(feature = "blake2b_simd")] {
blake2bp::Params::new()
.hash_length(64)
.key(key)
.hash(data)
.as_bytes()
.to_vec()
} else {
unimplemented!("Asuran was not compiled with BLAKE2b support")
}
}
}
HMAC::Blake3 => {
cfg_if! {
if #[cfg(feature = "blake3")] {
let mut tmp_key = [0_u8; 32];
let len = min(32, key.len());
tmp_key[..len].copy_from_slice(&key[..len]);
blake3::keyed_hash(&tmp_key, data).as_bytes().to_vec()
} else {
unimplemented!("Asuran was not compiled with BLAKE3 support")
}
}
}
HMAC::SHA3 => {
cfg_if! {
if #[cfg(feature = "sha3")] {
let mut mac = HmacSHA3::new_from_slice(key)
.expect("HmacSHA3 was provided with a key of invalid length.");
mac.update(data);
mac.finalize().into_bytes().as_slice().to_vec()
} else {
unimplemented!("Asuran was not compiled with SHA3 support")
}
}
}
}
}
pub fn mac(self, data: &[u8], key: &Key) -> Vec<u8> {
let key = key.hmac_key();
self.internal_mac(data, key)
}
pub fn id(self, data: &[u8], key: &Key) -> Vec<u8> {
let key = key.id_key();
self.internal_mac(data, key)
}
#[allow(unused_variables)]
pub fn verify_hmac(self, input_mac: &[u8], data: &[u8], key: &Key) -> bool {
let key = key.hmac_key();
match self {
HMAC::SHA256 => {
cfg_if! {
if #[cfg(feature = "sha2")] {
let mut mac = HmacSha256::new_from_slice(key)
.expect("HmacSHA256 was provided with a key of invalid length.");
mac.update(data);
let result = mac.verify(input_mac);
result.is_ok()
} else {
unimplemented!("Asuran was not compiled with SHA2 support")
}
}
}
HMAC::Blake2b => {
cfg_if! {
if #[cfg(feature = "blake2b_simd")] {
let hash = Params::new().hash_length(64).key(key).hash(data);
hash.eq(input_mac)
} else {
unimplemented!("Asuran was not compiled with BLAKE2b support")
}
}
}
HMAC::Blake2bp => {
cfg_if! {
if #[cfg(feature = "blake2b_simd")] {
let hash = blake2bp::Params::new().hash_length(64).key(key).hash(data);
hash.eq(input_mac)
} else {
unimplemented!("Asuran was not compiled with BLAKE2b support")
}
}
}
HMAC::Blake3 => {
cfg_if! {
if #[cfg(feature = "blake3")] {
let mut tmp_hash = [0_u8; 32];
tmp_hash.copy_from_slice(&input_mac[..32]);
let mut tmp_key = [0_u8; 32];
tmp_key.copy_from_slice(&key[..32]);
let input_hash = blake3::Hash::from(tmp_hash);
let output_hash = blake3::keyed_hash(&tmp_key, data);
output_hash.eq(&input_hash)
} else {
unimplemented!("Asuran was not compiled with BLAKE3 support")
}
}
}
HMAC::SHA3 => {
cfg_if! {
if #[cfg(feature = "sha3")] {
let mut mac = HmacSHA3::new_from_slice(key)
.expect("HmacSHA3 was provided with a key of invalid length");
mac.update(data);
let result = mac.verify(input_mac);
result.is_ok()
} else {
unimplemented!("Asuran was not compiled with SHA3 support")
}
}
}
}
}
}