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improved pool mutex logic

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monica 2023-03-09 23:44:30 -05:00
parent b3053f70e7
commit 285aab8080
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1 changed files with 16 additions and 11 deletions
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27
zssp/src/zssp.rs
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@ -130,12 +130,13 @@ enum Offer {
RekeyInit(P384KeyPair, i64),
}
const AES_POOL_SIZE: usize = 4;
struct SessionKey {
ratchet_key: Secret<BASE_KEY_SIZE>, // Key used in derivation of the next session key
ratchet_key: Secret<BASE_KEY_SIZE>, // Key used in derivation of the next session key
//receive_key: Secret<AES_256_KEY_SIZE>, // Receive side AES-GCM key
//send_key: Secret<AES_256_KEY_SIZE>, // Send side AES-GCM key
receive_cipher_pool: [Mutex<AesGcm<false>>; 4], // Pool of reusable sending ciphers
send_cipher_pool: [Mutex<AesGcm<true>>; 4], // Pool of reusable receiving ciphers
receive_cipher_pool: [Mutex<AesGcm<false>>; AES_POOL_SIZE], // Pool of reusable sending ciphers
send_cipher_pool: [Mutex<AesGcm<true>>; AES_POOL_SIZE], // Pool of reusable receiving ciphers
rekey_at_time: i64, // Rekey at or after this time (ticks)
created_at_counter: u64, // Counter at which session was created
rekey_at_counter: u64, // Rekey at or after this counter
@ -1575,20 +1576,24 @@ impl SessionKey {
fn get_send_cipher<'a>(&'a self, counter: u64) -> Result<MutexGuard<'a, AesGcm<true>>, Error> {
if counter < self.expire_at_counter {
//for i in 0..self.send_cipher_pool.len() {
// let mutex = &self.send_cipher_pool[(counter as usize + i)%self.send_cipher_pool.len()];
// if let Ok(guard) = mutex.try_lock() {
// return Ok(guard);
// }
//}
Ok(self.send_cipher_pool[(counter as usize)%self.send_cipher_pool.len()].lock().unwrap())
for i in 0..(AES_POOL_SIZE - 1) {
if let Ok(p) = self.send_cipher_pool[(counter as usize).wrapping_add(i)%AES_POOL_SIZE].try_lock() {
return Ok(p);
}
}
Ok(self.send_cipher_pool[(counter as usize)%AES_POOL_SIZE].lock().unwrap())
} else {
Err(Error::MaxKeyLifetimeExceeded)
}
}
fn get_receive_cipher<'a>(&'a self, counter: u64) -> MutexGuard<'a, AesGcm<false>> {
self.receive_cipher_pool[(counter as usize)%self.receive_cipher_pool.len()].lock().unwrap()
for i in 0..(AES_POOL_SIZE - 1) {
if let Ok(p) = self.receive_cipher_pool[(counter as usize).wrapping_add(i)%AES_POOL_SIZE].try_lock() {
return p;
}
}
self.receive_cipher_pool[(counter as usize)%AES_POOL_SIZE].lock().unwrap()
}
}