Crate c255b3

The c255b3 signature scheme: deterministic Schnorr signatures with Curve25519 and Blake3.

Example Usage

Generating

To sign a message you first need a SecretKey.

use c255b3::SecretKey;
use rand::{RngCore,rngs::OsRng};

// Generate 256 random bits.
let mut csprng = OsRng;
let mut raw_key = [0u8; 32];
csprng.fill_bytes(&mut raw_key);

// Create a secret key from those bits.
let secret_key = SecretKey::from_bits(&raw_key);

Signing

Once generated, the secret key can produce a Signature for a messages:

use c255b3::{Domain,Signature};

let msg: &[u8] = b"Did gyre and gimble in the wabe:";
let domain = Domain(b"test domain for documentation...");
let sig: Signature = secret_key.sign_domain(domain, msg);

Verifying

Then we can derive the PublicKey, and check the signature.

use c255b3::PublicKey;

let public_key: PublicKey = secret_key.derive_public();
assert!(public_key.verify_domain(domain, &sig, msg).is_ok());

Structs

• Domain
  A signature domain.
• Keys
  A c25519 keypair, to sign or verify messages.
• PublicKey
  A c25519 public key to verify signatures.
• SecretKey
  A c255b3 secret key to sign messages with.
• Signature
  A c255b3 signature.

Enums

• Error
  The errors we can encounter while working with c255b3 keys and signatures.