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https://github.com/jmcorgan/fips.git
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Johnathan Corgan
567e6a535e
Every sign/verify/key-derive site built a fresh context via Secp256k1::new(), which allocates a Secp256k1<All> and runs randomization/blinding table setup on each call. Introduce one crate-wide LazyLock<Secp256k1<All>> and reuse it across the local, peer, and auth sites (and their tests). Behavior-neutral: identical secp256k1 API calls, only the context lifetime changes, and the shared All context still performs the standard construction-time blinding.
68 lines
1.9 KiB
Rust
68 lines
1.9 KiB
Rust
//! Authentication challenge-response protocol.
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use rand::Rng;
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use secp256k1::XOnlyPublicKey;
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use sha2::{Digest, Sha256};
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use super::{IdentityError, NodeAddr};
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/// Domain separation string for authentication challenges.
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const AUTH_DOMAIN: &[u8] = b"fips-auth-v1";
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/// A 32-byte random authentication challenge.
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#[derive(Clone, Copy, Debug)]
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pub struct AuthChallenge([u8; 32]);
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impl AuthChallenge {
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/// Generate a new random challenge.
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pub fn generate() -> Self {
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let mut bytes = [0u8; 32];
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rand::rng().fill_bytes(&mut bytes);
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Self(bytes)
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}
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/// Create a challenge from bytes.
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pub fn from_bytes(bytes: [u8; 32]) -> Self {
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Self(bytes)
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}
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/// Return the challenge bytes.
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pub fn as_bytes(&self) -> &[u8; 32] {
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&self.0
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}
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/// Verify a response to this challenge.
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pub fn verify(&self, response: &AuthResponse) -> Result<NodeAddr, IdentityError> {
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let digest = auth_challenge_digest(&self.0, response.timestamp);
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super::SECP
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.verify_schnorr(&response.signature, &digest, &response.pubkey)
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.map_err(|_| IdentityError::SignatureVerificationFailed)?;
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Ok(NodeAddr::from_pubkey(&response.pubkey))
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}
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}
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/// Response to an authentication challenge.
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#[derive(Clone, Debug)]
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pub struct AuthResponse {
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/// The responder's public key.
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pub pubkey: XOnlyPublicKey,
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/// Timestamp included in the signed message.
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pub timestamp: u64,
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/// Schnorr signature over the challenge digest.
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pub signature: secp256k1::schnorr::Signature,
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}
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/// Compute the digest for an authentication challenge.
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pub(super) fn auth_challenge_digest(challenge: &[u8; 32], timestamp: u64) -> [u8; 32] {
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let mut hasher = Sha256::new();
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hasher.update(AUTH_DOMAIN);
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hasher.update(challenge);
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hasher.update(timestamp.to_be_bytes());
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let result = hasher.finalize();
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let mut digest = [0u8; 32];
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digest.copy_from_slice(&result);
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digest
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}
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