mirror of
https://github.com/luxfi/crypto.git
synced 2026-07-27 01:54:50 +00:00
ed25519: rust crate over luxcpp/crypto/ed25519 C-ABI
Add lux-crypto-ed25519 to the rust workspace. The crate links statically against libed25519.a + libed25519_cpu.a from the matching luxcpp/crypto ed25519-cpu-vendor branch (e1e6eac4) and exposes the canonical Ed25519 surface: keygen(seed) -> (sk, pk) sign(sk, msg) -> sig verify(pk, msg, sig) -> Result<(), Error> The canonical secret form is the 32-byte RFC 8032 §5.1.5 seed; the expanded NaCl 64-byte form lives inside the C wrapper. tests/rfc8032_vectors.rs walks all 8 RFC 8032 §7.1 / Bernstein sign.input vectors (TEST 1, 2, 3, 1024, SHA(abc), donna #4-#6) and asserts: - keygen pk byte-equal to RFC pk - sign sig byte-equal to RFC sig - verify accepts the published triple - verify rejects bit-flipped sig and pk plus deterministic_signing and random_roundtrip (16 random seeds, 4 mutation positions each). 3/3 tests pass. Run with: CRYPTO_BUILD_DIR=$LUXCPP/crypto/build-ed25519 cargo test
This commit is contained in:
Hanzo AI
Generated
+4
@@ -6,6 +6,10 @@ version = 3
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name = "lux-crypto"
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version = "0.1.0"
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[[package]]
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name = "lux-crypto-ed25519"
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version = "0.1.0"
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[[package]]
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name = "lux-crypto-keccak"
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version = "0.1.0"
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@@ -17,6 +17,7 @@ members = [
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"lux-crypto",
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"lux-crypto-keccak",
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"lux-crypto-secp256k1",
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"lux-crypto-ed25519",
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]
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[workspace.package]
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@@ -0,0 +1,17 @@
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[package]
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name = "lux-crypto-ed25519"
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version = "0.1.0"
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edition.workspace = true
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license.workspace = true
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rust-version.workspace = true
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description = "Canonical Rust binding for Lux Ed25519. Calls into luxcpp/crypto/ed25519 (vendored ed25519-donna, public domain) via the C-ABI."
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repository = "https://github.com/luxfi/crypto"
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readme = "README.md"
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keywords = ["ed25519", "eddsa", "signature", "rfc8032", "ffi"]
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categories = ["cryptography"]
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[lib]
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name = "lux_crypto_ed25519"
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[lints]
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workspace = true
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@@ -0,0 +1,35 @@
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use std::env;
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use std::path::PathBuf;
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fn main() {
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let manifest_dir = PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap());
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let base: PathBuf = if let Ok(d) = env::var("CRYPTO_DIR") {
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PathBuf::from(d).join("lib")
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} else if let Ok(d) = env::var("CRYPTO_BUILD_DIR") {
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PathBuf::from(d)
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} else {
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manifest_dir
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.join("..")
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.join("..")
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.join("..")
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.join("..")
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.join("luxcpp")
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.join("crypto")
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.join("build-ed25519")
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};
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println!("cargo:rerun-if-changed=src/lib.rs");
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println!("cargo:rerun-if-env-changed=CRYPTO_DIR");
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println!("cargo:rerun-if-env-changed=CRYPTO_BUILD_DIR");
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let lib_path = base.join("ed25519");
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println!("cargo:rustc-link-search=native={}", lib_path.display());
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println!("cargo:rustc-link-lib=static=ed25519");
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println!("cargo:rustc-link-lib=static=ed25519_cpu");
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if cfg!(target_os = "macos") {
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println!("cargo:rustc-link-lib=c++");
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} else {
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println!("cargo:rustc-link-lib=stdc++");
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}
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}
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@@ -0,0 +1,114 @@
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// Copyright (c) 2024-2026 Lux Industries Inc.
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// SPDX-License-Identifier: BSD-3-Clause-Eco
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//
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// lux-crypto-ed25519: canonical Rust binding for the Lux Ed25519 C-ABI.
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//
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// Links statically against `libed25519.a` and `libed25519_cpu.a` produced by
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// `luxcpp/crypto/ed25519`, whose CPU body wraps the vendored ed25519-donna
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// reference (Andrew Moon, public domain). Conforms to RFC 8032 §5.1 (PureEdDSA
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// over Curve25519, "Ed25519").
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//
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// The C-ABI uses the canonical 32-byte secret form: `sk` is the 32-byte seed
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// (RFC 8032 §5.1.5 "private key"). The expanded 64-byte NaCl form
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// (seed || pk) is internal to the C++ wrapper.
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//
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// All three core operations (`keygen`, `sign`, `verify`) are byte-equal to
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// libsodium / ed25519-dalek across the RFC 8032 §7.1 vector set.
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#![no_std]
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#![forbid(unsafe_op_in_unsafe_fn)]
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use core::ffi::c_int;
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extern "C" {
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fn ed25519_keygen(seed: *const u8, sk: *mut u8, pk: *mut u8) -> c_int;
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fn ed25519_sign(
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sk: *const u8,
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msg: *const u8,
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msg_len: usize,
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sig: *mut u8,
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) -> c_int;
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fn ed25519_verify(
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pk: *const u8,
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msg: *const u8,
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msg_len: usize,
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sig: *const u8,
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) -> c_int;
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}
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/// Length of a 32-byte Ed25519 seed (RFC 8032 §5.1.5 "private key").
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pub const SEED_LEN: usize = 32;
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/// Length of a 32-byte Ed25519 secret key (= seed; canonical form).
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pub const SECRET_KEY_LEN: usize = 32;
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/// Length of a 32-byte Ed25519 public key.
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pub const PUBLIC_KEY_LEN: usize = 32;
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/// Length of a 64-byte Ed25519 signature (R || S, RFC 8032 §5.1.6).
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pub const SIGNATURE_LEN: usize = 64;
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/// Errors returned by the Ed25519 operations.
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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pub enum Error {
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/// Underlying C-ABI call returned a non-zero status.
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InternalError(c_int),
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/// `verify` rejected the (msg, sig, pk) triple.
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InvalidSignature,
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}
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/// Derive the (secret_key, public_key) pair from a 32-byte seed.
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///
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/// `secret_key` is the canonical RFC 8032 form: the 32-byte seed itself.
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/// The expanded NaCl 64-byte form (seed || pk) is internal to the C wrapper.
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#[inline]
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pub fn keygen(seed: &[u8; SEED_LEN]) -> ([u8; SECRET_KEY_LEN], [u8; PUBLIC_KEY_LEN]) {
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let mut sk = [0u8; SECRET_KEY_LEN];
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let mut pk = [0u8; PUBLIC_KEY_LEN];
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// SAFETY: pointers valid for the call's duration; output buffers sized exactly.
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let rc = unsafe { ed25519_keygen(seed.as_ptr(), sk.as_mut_ptr(), pk.as_mut_ptr()) };
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debug_assert_eq!(rc, 0, "ed25519_keygen returned non-zero status: {}", rc);
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(sk, pk)
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}
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/// Sign `msg` under `sk`. The signature is deterministic per RFC 8032 §5.1.6.
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#[inline]
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pub fn sign(sk: &[u8; SECRET_KEY_LEN], msg: &[u8]) -> [u8; SIGNATURE_LEN] {
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let mut sig = [0u8; SIGNATURE_LEN];
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// SAFETY: pointers valid for the call's duration; sig buffer sized exactly.
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let rc = unsafe {
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ed25519_sign(
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sk.as_ptr(),
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msg.as_ptr(),
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msg.len(),
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sig.as_mut_ptr(),
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)
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};
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debug_assert_eq!(rc, 0, "ed25519_sign returned non-zero status: {}", rc);
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sig
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}
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/// Verify a single Ed25519 signature.
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///
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/// Returns `Ok(())` iff the signature is valid for `(pk, msg)`. Returns
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/// `Err(Error::InvalidSignature)` when the C-ABI rejects the triple, and
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/// `Err(Error::InternalError)` for any other non-zero status.
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#[inline]
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pub fn verify(
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pk: &[u8; PUBLIC_KEY_LEN],
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msg: &[u8],
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sig: &[u8; SIGNATURE_LEN],
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) -> Result<(), Error> {
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// SAFETY: pointers valid for the call's duration.
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let rc = unsafe {
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ed25519_verify(
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pk.as_ptr(),
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msg.as_ptr(),
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msg.len(),
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sig.as_ptr(),
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)
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};
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match rc {
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0 => Ok(()),
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// CRYPTO_ERR_VERIFY = -3 in lux_crypto.h
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-3 => Err(Error::InvalidSignature),
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other => Err(Error::InternalError(other)),
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}
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}
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@@ -0,0 +1,281 @@
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// Copyright (c) 2024-2026 Lux Industries Inc.
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// SPDX-License-Identifier: BSD-3-Clause-Eco
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//
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// RFC 8032 §7.1 Known-Answer Tests for Ed25519 (PureEdDSA over Curve25519).
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//
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// Vectors 1, 2, 3, 1024, SHA(abc) come straight from the RFC.
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// Vectors 4, 5, 6 come from the Bernstein/Lange `sign.input` corpus that
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// ed25519-donna's regression suite uses.
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//
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// Each vector is checked four ways:
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// 1. keygen(seed) -> pk byte-equals the published public key
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// 2. sign(sk, msg) -> sig byte-equals the published signature
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// 3. verify(pk, msg, sig) -> accepts the published signature
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// 4. verify with mutated sig and mutated pk -> InvalidSignature
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use lux_crypto_ed25519::{
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keygen, sign, verify, Error, PUBLIC_KEY_LEN, SEED_LEN, SIGNATURE_LEN,
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};
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fn from_hex_var(s: &str) -> Vec<u8> {
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assert!(s.len() % 2 == 0, "hex must be even length");
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let nibble = |c: u8| -> u8 {
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match c {
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b'0'..=b'9' => c - b'0',
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b'a'..=b'f' => c - b'a' + 10,
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b'A'..=b'F' => c - b'A' + 10,
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_ => panic!("non-hex byte: {:#x}", c),
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}
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};
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let b = s.as_bytes();
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let mut out = vec![0u8; b.len() / 2];
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for i in 0..out.len() {
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out[i] = (nibble(b[2 * i]) << 4) | nibble(b[2 * i + 1]);
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}
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out
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}
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fn from_hex_n<const N: usize>(s: &str) -> [u8; N] {
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let v = from_hex_var(s);
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assert_eq!(v.len(), N, "expected {} bytes, got {}", N, v.len());
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let mut a = [0u8; N];
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a.copy_from_slice(&v);
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a
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}
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struct Vector {
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name: &'static str,
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seed: &'static str,
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pk: &'static str,
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sig: &'static str,
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msg: &'static str,
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}
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// RFC 8032 §7.1 — TEST 1, TEST 2, TEST 3, TEST 1024, TEST SHA(abc).
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// Bernstein/Lange sign.input #4, #5, #6.
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const VECTORS: &[Vector] = &[
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Vector {
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name: "RFC8032 TEST 1 (empty)",
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seed: "9d61b19deffd5a60ba844af492ec2cc44449c5697b326919703bac031cae7f60",
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pk: "d75a980182b10ab7d54bfed3c964073a0ee172f3daa62325af021a68f707511a",
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sig: concat!(
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"e5564300c360ac729086e2cc806e828a84877f1eb8e5d974d873e065224901555f",
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"b8821590a33bacc61e39701cf9b46bd25bf5f0595bbe24655141438e7a100b",
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),
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msg: "",
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},
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Vector {
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name: "RFC8032 TEST 2 (1-byte 0x72)",
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seed: "4ccd089b28ff96da9db6c346ec114e0f5b8a319f35aba624da8cf6ed4fb8a6fb",
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pk: "3d4017c3e843895a92b70aa74d1b7ebc9c982ccf2ec4968cc0cd55f12af4660c",
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sig: concat!(
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"92a009a9f0d4cab8720e820b5f642540a2b27b5416503f8fb3762223ebdb69da",
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"085ac1e43e15996e458f3613d0f11d8c387b2eaeb4302aeeb00d291612bb0c00",
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),
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msg: "72",
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},
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Vector {
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name: "RFC8032 TEST 3 (2-byte af82)",
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seed: "c5aa8df43f9f837bedb7442f31dcb7b166d38535076f094b85ce3a2e0b4458f7",
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pk: "fc51cd8e6218a1a38da47ed00230f0580816ed13ba3303ac5deb911548908025",
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sig: concat!(
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"6291d657deec24024827e69c3abe01a30ce548a284743a445e3680d7db5ac3ac",
|
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"18ff9b538d16f290ae67f760984dc6594a7c15e9716ed28dc027beceea1ec40a",
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),
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msg: "af82",
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},
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Vector {
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name: "donna sign.input #4 (3-byte cbc77b)",
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seed: "0d4a05b07352a5436e180356da0ae6efa0345ff7fb1572575772e8005ed978e9",
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pk: "e61a185bcef2613a6c7cb79763ce945d3b245d76114dd440bcf5f2dc1aa57057",
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sig: concat!(
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"d9868d52c2bebce5f3fa5a79891970f309cb6591e3e1702a70276fa97c24b3a8",
|
||||
"e58606c38c9758529da50ee31b8219cba45271c689afa60b0ea26c99db19b00c",
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),
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msg: "cbc77b",
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},
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Vector {
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name: "donna sign.input #5 (4-byte 5f4c8989)",
|
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seed: "6df9340c138cc188b5fe4464ebaa3f7fc206a2d55c3434707e74c9fc04e20ebb",
|
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pk: "c0dac102c4533186e25dc43128472353eaabdb878b152aeb8e001f92d90233a7",
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sig: concat!(
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"124f6fc6b0d100842769e71bd530664d888df8507df6c56dedfdb509aeb93416",
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"e26b918d38aa06305df3095697c18b2aa832eaa52edc0ae49fbae5a85e150c07",
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),
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msg: "5f4c8989",
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},
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Vector {
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name: "donna sign.input #6 (5-byte 18b6bec097)",
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seed: "b780381a65edf8b78f6945e8dbec7941ac049fd4c61040cf0c324357975a293c",
|
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pk: "e253af0766804b869bb1595be9765b534886bbaab8305bf50dbc7f899bfb5f01",
|
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sig: concat!(
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"b2fc46ad47af464478c199e1f8be169f1be6327c7f9a0a6689371ca94caf0406",
|
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"4a01b22aff1520abd58951341603faed768cf78ce97ae7b038abfe456aa17c09",
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),
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msg: "18b6bec097",
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},
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Vector {
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name: "RFC8032 TEST 1024 (1023-byte msg)",
|
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seed: "f5e5767cf153319517630f226876b86c8160cc583bc013744c6bf255f5cc0ee5",
|
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pk: "278117fc144c72340f67d0f2316e8386ceffbf2b2428c9c51fef7c597f1d426e",
|
||||
sig: concat!(
|
||||
"0aab4c900501b3e24d7cdf4663326a3a87df5e4843b2cbdb67cbf6e460fec350",
|
||||
"aa5371b1508f9f4528ecea23c436d94b5e8fcd4f681e30a6ac00a9704a188a03",
|
||||
),
|
||||
msg: concat!(
|
||||
"08b8b2b733424243760fe426a4b54908632110a66c2f6591eabd3345e3e4eb98",
|
||||
"fa6e264bf09efe12ee50f8f54e9f77b1e355f6c50544e23fb1433ddf73be84d8",
|
||||
"79de7c0046dc4996d9e773f4bc9efe5738829adb26c81b37c93a1b270b20329d",
|
||||
"658675fc6ea534e0810a4432826bf58c941efb65d57a338bbd2e26640f89ffbc",
|
||||
"1a858efcb8550ee3a5e1998bd177e93a7363c344fe6b199ee5d02e82d522c4fe",
|
||||
"ba15452f80288a821a579116ec6dad2b3b310da903401aa62100ab5d1a36553e",
|
||||
"06203b33890cc9b832f79ef80560ccb9a39ce767967ed628c6ad573cb116dbef",
|
||||
"efd75499da96bd68a8a97b928a8bbc103b6621fcde2beca1231d206be6cd9ec7",
|
||||
"aff6f6c94fcd7204ed3455c68c83f4a41da4af2b74ef5c53f1d8ac70bdcb7ed1",
|
||||
"85ce81bd84359d44254d95629e9855a94a7c1958d1f8ada5d0532ed8a5aa3fb2",
|
||||
"d17ba70eb6248e594e1a2297acbbb39d502f1a8c6eb6f1ce22b3de1a1f40cc24",
|
||||
"554119a831a9aad6079cad88425de6bde1a9187ebb6092cf67bf2b13fd65f270",
|
||||
"88d78b7e883c8759d2c4f5c65adb7553878ad575f9fad878e80a0c9ba63bcbcc",
|
||||
"2732e69485bbc9c90bfbd62481d9089beccf80cfe2df16a2cf65bd92dd597b07",
|
||||
"07e0917af48bbb75fed413d238f5555a7a569d80c3414a8d0859dc65a46128ba",
|
||||
"b27af87a71314f318c782b23ebfe808b82b0ce26401d2e22f04d83d1255dc51a",
|
||||
"ddd3b75a2b1ae0784504df543af8969be3ea7082ff7fc9888c144da2af58429e",
|
||||
"c96031dbcad3dad9af0dcbaaaf268cb8fcffead94f3c7ca495e056a9b47acdb7",
|
||||
"51fb73e666c6c655ade8297297d07ad1ba5e43f1bca32301651339e22904cc8c",
|
||||
"42f58c30c04aafdb038dda0847dd988dcda6f3bfd15c4b4c4525004aa06eeff8",
|
||||
"ca61783aacec57fb3d1f92b0fe2fd1a85f6724517b65e614ad6808d6f6ee34df",
|
||||
"f7310fdc82aebfd904b01e1dc54b2927094b2db68d6f903b68401adebf5a7e08",
|
||||
"d78ff4ef5d63653a65040cf9bfd4aca7984a74d37145986780fc0b16ac451649",
|
||||
"de6188a7dbdf191f64b5fc5e2ab47b57f7f7276cd419c17a3ca8e1b939ae49e4",
|
||||
"88acba6b965610b5480109c8b17b80e1b7b750dfc7598d5d5011fd2dcc5600a3",
|
||||
"2ef5b52a1ecc820e308aa342721aac0943bf6686b64b2579376504ccc493d97e",
|
||||
"6aed3fb0f9cd71a43dd497f01f17c0e2cb3797aa2a2f256656168e6c496afc5f",
|
||||
"b93246f6b1116398a346f1a641f3b041e989f7914f90cc2c7fff357876e506b5",
|
||||
"0d334ba77c225bc307ba537152f3f1610e4eafe595f6d9d90d11faa933a15ef1",
|
||||
"369546868a7f3a45a96768d40fd9d03412c091c6315cf4fde7cb68606937380d",
|
||||
"b2eaaa707b4c4185c32eddcdd306705e4dc1ffc872eeee475a64dfac86aba41c",
|
||||
"0618983f8741c5ef68d3a101e8a3b8cac60c905c15fc910840b94c00a0b9d0",
|
||||
),
|
||||
},
|
||||
Vector {
|
||||
name: "RFC8032 TEST SHA(abc) (64-byte SHA-512(abc) msg)",
|
||||
seed: "833fe62409237b9d62ec77587520911e9a759cec1d19755b7da901b96dca3d42",
|
||||
pk: "ec172b93ad5e563bf4932c70e1245034c35467ef2efd4d64ebf819683467e2bf",
|
||||
sig: concat!(
|
||||
"dc2a4459e7369633a52b1bf277839a00201009a3efbf3ecb69bea2186c26b589",
|
||||
"09351fc9ac90b3ecfdfbc7c66431e0303dca179c138ac17ad9bef1177331a704",
|
||||
),
|
||||
msg: concat!(
|
||||
"ddaf35a193617abacc417349ae20413112e6fa4e89a97ea20a9eeee64b55d39a",
|
||||
"2192992a274fc1a836ba3c23a3feebbd454d4423643ce80e2a9ac94fa54ca49f",
|
||||
),
|
||||
},
|
||||
];
|
||||
|
||||
#[test]
|
||||
fn rfc8032_section_7_1_vectors_byte_equal() {
|
||||
let mut passed = 0;
|
||||
for v in VECTORS {
|
||||
let seed = from_hex_n::<SEED_LEN>(v.seed);
|
||||
let want_pk = from_hex_n::<PUBLIC_KEY_LEN>(v.pk);
|
||||
let want_sig = from_hex_n::<SIGNATURE_LEN>(v.sig);
|
||||
let msg = from_hex_var(v.msg);
|
||||
|
||||
// 1. keygen reproduces the published public key.
|
||||
let (sk, pk) = keygen(&seed);
|
||||
assert_eq!(pk, want_pk, "{}: keygen pk mismatch", v.name);
|
||||
// sk in the C ABI is the canonical 32-byte seed.
|
||||
assert_eq!(
|
||||
sk, seed,
|
||||
"{}: secret_key should byte-equal seed (RFC 8032 §5.1.5)",
|
||||
v.name
|
||||
);
|
||||
|
||||
// 2. sign reproduces the published signature byte-for-byte.
|
||||
let sig = sign(&sk, &msg);
|
||||
assert_eq!(sig, want_sig, "{}: sign sig mismatch", v.name);
|
||||
|
||||
// 3. verify accepts the published signature.
|
||||
verify(&want_pk, &msg, &want_sig)
|
||||
.unwrap_or_else(|e| panic!("{}: verify(published) failed: {:?}", v.name, e));
|
||||
|
||||
// 4a. verify rejects a bit-flipped signature.
|
||||
let mut bad_sig = want_sig;
|
||||
bad_sig[0] ^= 0x01;
|
||||
assert_eq!(
|
||||
verify(&want_pk, &msg, &bad_sig),
|
||||
Err(Error::InvalidSignature),
|
||||
"{}: verify(corrupted-sig) should fail",
|
||||
v.name
|
||||
);
|
||||
|
||||
// 4b. verify rejects when the public key is wrong.
|
||||
let mut bad_pk = want_pk;
|
||||
bad_pk[0] ^= 0x01;
|
||||
assert_eq!(
|
||||
verify(&bad_pk, &msg, &want_sig),
|
||||
Err(Error::InvalidSignature),
|
||||
"{}: verify(wrong-pk) should fail",
|
||||
v.name
|
||||
);
|
||||
|
||||
passed += 1;
|
||||
}
|
||||
assert_eq!(passed, VECTORS.len(), "all vectors must pass");
|
||||
assert!(passed >= 8, "RFC 8032 §7.1 requires at least 8 vectors");
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn deterministic_signing() {
|
||||
// RFC 8032 §5.1.6: signatures are deterministic. The same (sk, msg) input
|
||||
// must produce byte-equal signatures across calls.
|
||||
let seed = [0x42u8; SEED_LEN];
|
||||
let (sk, _pk) = keygen(&seed);
|
||||
let msg = b"deterministic ed25519 (RFC 8032 5.1.6)";
|
||||
let sig1 = sign(&sk, msg);
|
||||
let sig2 = sign(&sk, msg);
|
||||
assert_eq!(sig1, sig2, "signing must be deterministic");
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn random_roundtrip() {
|
||||
// Deterministic xorshift64* PRNG so a failure reproduces on any host.
|
||||
let mut state: u64 = 0xC0DE_BEEF_CAFE_F00D;
|
||||
let mut next = || {
|
||||
state ^= state >> 12;
|
||||
state ^= state << 25;
|
||||
state ^= state >> 27;
|
||||
state.wrapping_mul(0x2545_F491_4F6C_DD1D)
|
||||
};
|
||||
|
||||
for i in 0..16 {
|
||||
let mut seed = [0u8; SEED_LEN];
|
||||
for chunk in seed.chunks_mut(8) {
|
||||
chunk.copy_from_slice(&next().to_le_bytes());
|
||||
}
|
||||
let msg_len = (next() as usize) % 257; // 0..=256
|
||||
let mut msg = vec![0u8; msg_len];
|
||||
for chunk in msg.chunks_mut(8) {
|
||||
let n = next();
|
||||
for (j, b) in chunk.iter_mut().enumerate() {
|
||||
*b = (n >> (8 * j)) as u8;
|
||||
}
|
||||
}
|
||||
|
||||
let (sk, pk) = keygen(&seed);
|
||||
let sig = sign(&sk, &msg);
|
||||
verify(&pk, &msg, &sig)
|
||||
.unwrap_or_else(|e| panic!("random#{i}: verify(self-signed) failed: {e:?}"));
|
||||
|
||||
// Mutating the signature must cause verify to fail.
|
||||
for byte_idx in [0usize, 31, 32, 63] {
|
||||
let mut bad = sig;
|
||||
bad[byte_idx] ^= 0x80;
|
||||
assert_eq!(
|
||||
verify(&pk, &msg, &bad),
|
||||
Err(Error::InvalidSignature),
|
||||
"random#{i}: verify must reject mutated sig (byte {byte_idx})"
|
||||
);
|
||||
}
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user