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use crate::{
errors::{UnknownCryptoError, ValidationCryptoError},
hazardous::mac::hmac,
};
pub use crate::{hazardous::mac::hmac::Tag, hltypes::SecretKey};
#[must_use]
pub fn authenticate(secret_key: &SecretKey, data: &[u8]) -> Result<Tag, UnknownCryptoError> {
let mut state = hmac::init(&hmac::SecretKey::from_slice(
&secret_key.unprotected_as_bytes(),
)?);
state.update(data)?;
Ok(state.finalize()?)
}
#[must_use]
pub fn authenticate_verify(
expected: &Tag,
secret_key: &SecretKey,
data: &[u8],
) -> Result<bool, ValidationCryptoError> {
let v_key = &hmac::SecretKey::from_slice(&secret_key.unprotected_as_bytes())?;
hmac::verify(&expected, &v_key, &data)?;
Ok(true)
}
#[cfg(test)]
mod public {
use super::*;
mod test_auth_and_verify {
use super::*;
#[test]
fn test_authenticate_verify_bad_key() {
let sec_key_correct = SecretKey::generate(64).unwrap();
let sec_key_false = SecretKey::default();
let msg = "what do ya want for nothing?".as_bytes().to_vec();
let hmac_bob = authenticate(&sec_key_correct, &msg).unwrap();
assert_eq!(
authenticate_verify(&hmac_bob, &sec_key_correct, &msg).unwrap(),
true
);
assert!(authenticate_verify(&hmac_bob, &sec_key_false, &msg).is_err());
}
#[test]
fn test_authenticate_verify_bad_msg() {
let sec_key = SecretKey::generate(64).unwrap();
let msg = "what do ya want for nothing?".as_bytes().to_vec();
let hmac_bob = authenticate(&sec_key, &msg).unwrap();
assert_eq!(
authenticate_verify(&hmac_bob, &sec_key, &msg).unwrap(),
true
);
assert!(authenticate_verify(&hmac_bob, &sec_key, b"bad msg").is_err());
}
}
#[cfg(feature = "safe_api")]
mod proptest {
use super::*;
quickcheck! {
fn prop_authenticate_verify(input: Vec<u8>) -> bool {
let sk = SecretKey::default();
let tag = authenticate(&sk, &input[..]).unwrap();
authenticate_verify(&tag, &sk, &input[..]).unwrap()
}
}
quickcheck! {
fn prop_verify_fail_diff_key(input: Vec<u8>) -> bool {
let sk = SecretKey::default();
let sk2 = SecretKey::default();
let tag = authenticate(&sk, &input[..]).unwrap();
if authenticate_verify(&tag, &sk2, &input[..]).is_err() {
true
} else {
false
}
}
}
quickcheck! {
fn prop_verify_fail_diff_input(input: Vec<u8>) -> bool {
let sk = SecretKey::default();
let tag = authenticate(&sk, &input[..]).unwrap();
if authenticate_verify(&tag, &sk, b"Completely wrong input").is_err() {
true
} else {
false
}
}
}
}
}