Crate ed25519_compact

source · [−]
Expand description

A compact Ed25519 and X25519 implementation for Rust.

  • Formally-verified Curve25519 field arithmetic
  • no_std-friendly
  • WebAssembly-friendly
  • Compute@Edge-friendly
  • Lightweight
  • Zero dependencies if randomness is provided by the application
  • Only one portable dependency (getrandom) if not
  • Safe and simple Rust interface.

Example usage:

use ed25519_compact::*;

// A message to sign and verify.
let message = b"test";

// Generates a new key pair using a random seed.
// A given seed will always produce the same key pair.
let key_pair = KeyPair::from_seed(Seed::generate());

// Computes a signature for this message using the secret part of the key pair.
let signature = key_pair.sk.sign(message, Some(Noise::generate()));

// Verifies the signature using the public part of the key pair.
key_pair
    .pk
    .verify(message, &signature)
    .expect("Signature didn't verify");

// Verification of a different message using the same signature and public key fails.
key_pair
    .pk
    .verify(b"A different message", &signature)
    .expect_err("Signature shouldn't verify");

// All these structures can be viewed as raw bytes simply by dereferencing them:
let signature_as_bytes: &[u8] = signature.as_ref();
println!("Signature as bytes: {:?}", signature_as_bytes);

Cargo features:

  • self-verify: after having computed a new signature, verify that is it valid. This is slower, but improves resilience against fault attacks. It is enabled by default on WebAssembly targets.
  • std: disables no_std compatibility in order to make errors implement the standard Error trait.
  • random (enabled by default): adds Default and generate implementations to the Seed and Noise objects, in order to securely create random keys and noise.
  • traits: add support for the traits from the ed25519 and signature crates.
  • pem: add support for importing/exporting keys as OpenSSL-compatible PEM files.
  • blind-keys: add support for key blinding.
  • opt_size: Enable size optimizations (based on benchmarks, 8-15% size reduction at the cost of 6.5-7% performance).
  • x25519: Enable support for the X25519 key exchange system.
  • signatures: Enable support for signatures. Always required unless only X25519 is used.

Structs

KeyPair
A key pair.
Noise
Noise, for non-deterministic signatures.
PublicKey
A public key.
SecretKey
A secret key.
Seed
A seed, which a key pair can be derived from.
Signature
An Ed25519 signature.

Enums

Error