decaf377-rdsa is a variant of RedDSA, instantiated using the decaf377 group.
Signatures are parameterized by domain (for instance, Binding and SpendAuth); this library distinguishes different domains in the type system using the SigType trait as a type-level enum.
In addition to the Signature, SigningKey, VerificationKey types, the library also provides VerificationKeyBytes, a refinement of a [u8; 32] indicating that bytes represent an encoding of a RedJubjub verification key. This allows the VerificationKey type to cache verification checks related to the verification key encoding.
Examples
Creating a spend authorization signature, serializing and deserializing it, and verifying the signature:
# use std::convert::TryFrom;
use rand::thread_rng;
use decaf377_rdsa::*;
let msg = b"Hello!";
// Generate a secret key and sign the message
let sk = SigningKey::<SpendAuth>::new(thread_rng());
let sig = sk.sign(thread_rng(), msg);
// Types can be converted to raw byte arrays using From/Into
let sig_bytes: [u8; 64] = sig.into();
let pk_bytes: [u8; 32] = VerificationKey::from(&sk).into();
// Deserialize and verify the signature.
let sig: Signature<SpendAuth> = sig_bytes.into();
assert!(
VerificationKey::try_from(pk_bytes)
.and_then(|pk| pk.verify(msg, &sig))
.is_ok()
);
About
This library is based on the redjubjub crate.
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