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Swap endianness of test keys

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This commit is contained in:
Paul Hauner 2019-08-30 17:02:57 +10:00
parent a6e6827337
commit 96fb3be2c7
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GPG Key ID: 5E2CFF9B75FA63DF
2 changed files with 27 additions and 19 deletions
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40
eth2/utils/eth2_interop_keypairs/src/lib.rs
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@ -1,10 +1,21 @@
//! Produces the "deterministic" validator private keys used for inter-operability testing for
//! Ethereum 2.0 clients.
//!
//! Each private key is the first hash in the sha2 hash-chain that is less than 2^255. As such,
//! keys generated here are **not secret** and are **not for production use**.
//! Each private key is the sha2 hash of the validator index (little-endian, padded to 32 bytes),
//! modulo the BLS-381 curve order.
//!
//! Note: these keys have not been tested against a reference implementation, yet.
//! Keys generated here are **not secret** and are **not for production use**. It is trivial to
//! know the secret key for any validator.
//!
//!## Reference
//!
//! Reference implementation:
//!
//! https://github.com/ethereum/eth2.0-pm/blob/6e41fcf383ebeb5125938850d8e9b4e9888389b4/interop/mocked_start/keygen.py
//!
//!
//! This implementation passes the [reference implementation
//! tests](https://github.com/ethereum/eth2.0-pm/blob/6e41fcf383ebeb5125938850d8e9b4e9888389b4/interop/mocked_start/keygen_test_vector.yaml).
#[macro_use]
extern crate lazy_static;
@ -22,7 +33,9 @@ lazy_static! {
.expect("Curve order should be valid");
}
pub fn le_private_key(validator_index: usize) -> [u8; PRIVATE_KEY_BYTES] {
/// Return a G1 point for the given `validator_index`, encoded as a compressed point in
/// big-endian byte-ordering.
pub fn be_private_key(validator_index: usize) -> [u8; PRIVATE_KEY_BYTES] {
let preimage = {
let mut bytes = [0; HASH_BYTES];
let index = validator_index.to_le_bytes();
@ -33,25 +46,20 @@ pub fn le_private_key(validator_index: usize) -> [u8; PRIVATE_KEY_BYTES] {
let privkey = BigUint::from_bytes_le(&hash(&preimage)) % &*CURVE_ORDER;
let mut bytes = [0; PRIVATE_KEY_BYTES];
let privkey_bytes = privkey.to_bytes_le();
bytes[0..privkey_bytes.len()].copy_from_slice(&privkey_bytes);
let privkey_bytes = privkey.to_bytes_be();
bytes[PRIVATE_KEY_BYTES - privkey_bytes.len()..].copy_from_slice(&privkey_bytes);
bytes
}
/// Return a public and private keypair for a given `validator_index`.
pub fn keypair(validator_index: usize) -> Keypair {
let bytes = le_private_key(validator_index);
let sk =
SecretKey::from_bytes(&swap_bytes(bytes.to_vec())).expect("Should be valid private key");
let sk = SecretKey::from_bytes(&be_private_key(validator_index)).expect(&format!(
"Should build valid private key for validator index {}",
validator_index
));
Keypair {
pk: PublicKey::from_secret_key(&sk),
sk,
}
}
fn swap_bytes<T>(input: Vec<T>) -> Vec<T> {
let mut output = vec![];
input.into_iter().rev().for_each(|byte| output.push(byte));
output
}

6
eth2/utils/eth2_interop_keypairs/tests/test.rs
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@ -1,5 +1,5 @@
#![cfg(test)]
use eth2_interop_keypairs::{keypair, le_private_key};
use eth2_interop_keypairs::{be_private_key, keypair};
use num_bigint::BigUint;
#[test]
@ -23,8 +23,8 @@ fn reference_private_keys() {
.into_iter()
.enumerate()
.for_each(|(i, reference)| {
let bytes = le_private_key(i);
let num = BigUint::from_bytes_le(&bytes);
let bytes = be_private_key(i);
let num = BigUint::from_bytes_be(&bytes);
assert_eq!(&num.to_str_radix(10), reference)
});
}