OxideTalis/oxidetalis
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feat: Add sign_with_shared_secret function to K256Secret

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Signed-off-by: Awiteb <a@4rs.nl>
This commit is contained in:
Awiteb 2024-07-02 18:17:44 +03:00
parent aeac22250e
commit 39337f8d90
Signed by: awiteb
GPG key ID: 3F6B55640AA6682F
1 changed files with 25 additions and 18 deletions
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43
crates/oxidetalis_core/src/cipher.rs
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@ -106,6 +106,30 @@ impl K256Secret {
)
}
/// Sign a data with the shared secret.
///
/// The signature is exiplained in the OTMP specification.
pub fn sign_with_shared_secret(data: &[u8], shared_secret: &[u8; 32]) -> CoreSignature {
let mut time_and_nonce = [0u8; 24];
time_and_nonce[0..=7].copy_from_slice(
&SystemTime::now()
.duration_since(UNIX_EPOCH)
.expect("SystemTime before UNIX EPOCH!")
.as_secs()
.to_be_bytes(),
);
thread_rng().fill_bytes(&mut time_and_nonce[8..=23]);
let mut hmac_secret = [0u8; 56];
hmac_secret[0..=31].copy_from_slice(shared_secret);
hmac_secret[32..=55].copy_from_slice(&time_and_nonce);
let mut signature = [0u8; 56];
signature[0..=31].copy_from_slice(&hmac_sha256(data, &hmac_secret));
signature[32..=55].copy_from_slice(&time_and_nonce);
CoreSignature::from(signature)
}
/// Returns the public key.
pub fn pubkey(&self) -> CorePublicKey {
CorePublicKey::try_from(
@ -182,24 +206,7 @@ impl K256Secret {
/// The signature is exiplained in the OTMP specification.
#[logcall]
pub fn sign(&self, data: &[u8], sign_to: &CorePublicKey) -> CoreSignature {
let mut time_and_nonce = [0u8; 24];
time_and_nonce[0..=7].copy_from_slice(
&SystemTime::now()
.duration_since(UNIX_EPOCH)
.expect("SystemTime before UNIX EPOCH!")
.as_secs()
.to_be_bytes(),
);
thread_rng().fill_bytes(&mut time_and_nonce[8..=23]);
let mut hmac_secret = [0u8; 56];
hmac_secret[0..=31].copy_from_slice(&self.shared_secret(sign_to));
hmac_secret[32..=55].copy_from_slice(&time_and_nonce);
let mut signature = [0u8; 56];
signature[0..=31].copy_from_slice(&hmac_sha256(data, &hmac_secret));
signature[32..=55].copy_from_slice(&time_and_nonce);
CoreSignature::from(signature)
Self::sign_with_shared_secret(data, &self.shared_secret(sign_to))
}
/// Verify a signature with the shared secret.