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Helper function generate_nonce to avoid duplicates + default values for Scrypt

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This commit is contained in:
Kostas Chalkias
2021-02-21 20:29:26 -08:00
parent fa0fb48654
commit 37f98b3742
2 changed files with 18 additions and 11 deletions
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src/key_exchange/tripledh.rs
+9 -10
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@@ -55,11 +55,7 @@ impl<D: Hash, G: Group> KeyExchange<D, G> for TripleDH {
rng: &mut R,
) -> Result<(Self::KE1State, Self::KE1Message), ProtocolError> {
let client_e_kp = KeyPair::<G>::generate_random(rng);
let client_nonce: GenericArray<u8, NonceLen> = {
let mut client_nonce_bytes = vec![0u8; NonceLen::to_usize()];
rng.fill_bytes(&mut client_nonce_bytes);
GenericArray::clone_from_slice(&client_nonce_bytes)
};
let client_nonce = generate_nonce::<R>(rng);
let ke1_message = Ke1Message {
client_nonce,
@@ -89,11 +85,7 @@ impl<D: Hash, G: Group> KeyExchange<D, G> for TripleDH {
e_info: Vec<u8>,
) -> Result<(Vec<u8>, Self::KE2State, Self::KE2Message), ProtocolError> {
let server_e_kp = KeyPair::<G>::generate_random(rng);
let server_nonce: GenericArray<u8, NonceLen> = {
let mut server_nonce_bytes = vec![0u8; NonceLen::to_usize()];
rng.fill_bytes(&mut server_nonce_bytes);
GenericArray::clone_from_slice(&server_nonce_bytes)
};
let server_nonce = generate_nonce::<R>(rng);
let server_transcript = [
&l2_bytes[..],
@@ -566,3 +558,10 @@ fn derive_secrets<D: Hash>(
<D as Digest>::OutputSize::to_usize(),
)
}
// Generate a random nonce up to NonceLen::to_usize() bytes.
fn generate_nonce<R: RngCore + CryptoRng>(rng: &mut R) -> GenericArray<u8, NonceLen> {
let mut nonce_bytes = vec![0u8; NonceLen::to_usize()];
rng.fill_bytes(&mut nonce_bytes);
GenericArray::clone_from_slice(&nonce_bytes)
}