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use pyo3::prelude::*;
use pyo3::types::{PyBytes, PyTuple};
use pyo3::{wrap_pyfunction, IntoPy, PyObject};
use std::convert::TryFrom;
use ed25519_dalek::{Keypair, PublicKey, SecretKey, Signature, Verifier, Signer};
pub struct PyKeypair([u8; 32], [u8; 32]);
pub struct PySignature([u8; 64]);
fn create_from_pair(pair: &[u8]) -> Keypair {
match Keypair::from_bytes(pair) {
Ok(pair) => return pair,
Err(_) => panic!("Provided pair is invalid.")
}
}
fn create_from_parts(public: &[u8], secret: &[u8]) -> Keypair {
let mut pair = vec![];
pair.extend_from_slice(secret);
pair.extend_from_slice(public);
create_from_pair(&pair)
}
fn create_from_seed(seed: &[u8]) -> Keypair {
let secret = SecretKey::from_bytes(seed).unwrap();
let public: PublicKey = (&secret).into();
create_from_parts(public.as_bytes(), seed)
}
fn create_public(public: &[u8]) -> PublicKey {
match PublicKey::from_bytes(public) {
Ok(public) => return public,
Err(_) => panic!("Provided public key is invalid.")
}
}
#[pyfunction]
#[text_signature = "(seed)"]
pub fn ed_from_seed(seed: &[u8]) -> PyResult<PyKeypair> {
let keypair = create_from_seed(seed);
Ok(PyKeypair(keypair.secret.to_bytes(), keypair.public.to_bytes()))
}
#[pyfunction]
#[text_signature = "(public, secret, message)"]
pub fn ed_sign(public: &[u8], secret: &[u8], message: &[u8]) -> PyResult<PySignature> {
Ok(PySignature(create_from_parts(public, secret)
.sign(message)
.to_bytes()))
}
#[pyfunction]
#[text_signature = "(signature, message, public)"]
pub fn ed_verify(signature: &[u8], message: &[u8], public: &[u8]) -> bool {
let signature = match Signature::try_from(signature) {
Ok(signature) => signature,
Err(_) => return false
};
create_public(public)
.verify(message, &signature)
.is_ok()
}
#[pymodule]
fn ed25519(_py: Python<'_>, m: &PyModule) -> PyResult<()> {
m.add_wrapped(wrap_pyfunction!(ed_from_seed))?;
m.add_wrapped(wrap_pyfunction!(ed_sign))?;
m.add_wrapped(wrap_pyfunction!(ed_verify))?;
Ok(())
}
impl IntoPy<PyObject> for PyKeypair {
fn into_py(self, py: Python) -> PyObject {
let secret = PyBytes::new(py, &self.0);
let public = PyBytes::new(py, &self.1);
PyTuple::new(py, vec![secret, public]).into_py(py)
}
}
impl IntoPy<PyObject> for PySignature {
fn into_py(self, py: Python) -> PyObject {
let sig = PyBytes::new(py, &self.0);
sig.into_py(py)
}
}