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Use new externs for eth crypto (#114)

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* Add claims.

* Failing build

* Updatee to latest substrate, fix tests

* Remove unneeded

* Introduce tests with real work sig

* Use right 64 bytes of pubkey to get eth addr

* Fix for eth sig

* Fix build

* Fix wasm

* Use new externs for eth crypto.

* Bump spec version

* New runtime
This commit is contained in:
Gav Wood
2019-01-29 14:06:40 +01:00
committed by GitHub
parent c363077404
commit 82e866be42
7 changed files with 217 additions and 209 deletions
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polkadot/runtime/src/claims.rs
+40 -35
View File
@@ -17,8 +17,7 @@
//! Module to process claims from Ethereum addresses.
use rstd::prelude::*;
use tiny_keccak::keccak256;
use secp256k1;
use sr_io::{keccak_256, secp256k1_ecdsa_recover};
use srml_support::{StorageValue, StorageMap};
use system::ensure_signed;
use codec::Encode;
@@ -33,7 +32,28 @@ pub trait Trait: balances::Trait {
}
type EthereumAddress = [u8; 20];
type EcdsaSignature = ([u8; 32], [u8; 32], i8);
// This is a bit of a workaround until codec supports [u8; 65] directly.
#[derive(Encode, Decode, Clone, PartialEq)]
#[cfg_attr(feature = "std", derive(Debug))]
pub struct EcdsaSignature([u8; 32], [u8; 32], i8);
impl EcdsaSignature {
pub fn to_blob(&self) -> [u8; 65] {
let mut r = [0u8; 65];
r[0..32].copy_from_slice(&self.0[..]);
r[32..64].copy_from_slice(&self.1[..]);
r[64] = self.2 as u8;
r
}
pub fn from_blob(blob: &[u8; 65]) -> Self {
let mut r = Self([0u8; 32], [0u8; 32], 0);
r.0[..].copy_from_slice(&blob[0..32]);
r.1[..].copy_from_slice(&blob[32..64]);
r.2 = blob[64] as i8;
r
}
}
/// An event in this module.
decl_event!(
@@ -63,18 +83,10 @@ decl_storage! {
}
}
fn ecdsa_recover(sig: &EcdsaSignature, msg: &[u8; 32]) -> Option<[u8; 64]> {
let v = secp256k1::RecoveryId::parse(if sig.2 > 26 { sig.2 - 27 } else { sig.2 } as u8).ok()?;
let rs = (sig.0, sig.1).using_encoded(secp256k1::Signature::parse_slice).ok()?;
let pubkey = secp256k1::recover(&secp256k1::Message::parse(msg), &rs, &v).ok()?;
let mut res = [0u8; 64];
res.copy_from_slice(&pubkey.serialize()[1..65]);
Some(res)
}
fn create_msg(who: &[u8]) -> Vec<u8> {
// Constructs the message that Ethereum RPC's `personal_sign` and `eth_sign` would sign.
fn ethereum_signable_message(what: &[u8]) -> Vec<u8> {
let prefix = b"Pay DOTs to the Polkadot account:";
let mut l = prefix.len() + who.len();
let mut l = prefix.len() + what.len();
let mut rev = Vec::new();
while l > 0 {
rev.push(b'0' + (l % 10) as u8);
@@ -83,14 +95,16 @@ fn create_msg(who: &[u8]) -> Vec<u8> {
let mut v = b"\x19Ethereum Signed Message:\n".to_vec();
v.extend(rev.into_iter().rev());
v.extend_from_slice(&prefix[..]);
v.extend_from_slice(who);
v.extend_from_slice(what);
v
}
fn eth_recover(s: &EcdsaSignature, who: &[u8]) -> Option<EthereumAddress> {
let msg = keccak256(&create_msg(who));
// Attempts to recover the Ethereum address from a message signature signed by using
// the Ethereum RPC's `personal_sign` and `eth_sign`.
fn eth_recover(s: &EcdsaSignature, what: &[u8]) -> Option<EthereumAddress> {
let msg = keccak_256(&ethereum_signable_message(what));
let mut res = EthereumAddress::default();
res.copy_from_slice(&keccak256(&ecdsa_recover(s, &msg)?[..])[12..]);
res.copy_from_slice(&keccak_256(&secp256k1_ecdsa_recover(&s.to_blob(), &msg).ok()?[..])[12..]);
Some(res)
}
@@ -132,7 +146,7 @@ mod tests {
use super::*;
use sr_io::{self as runtime_io, with_externalities};
use substrate_primitives::{H256, Blake2Hasher, hexdisplay::HexDisplay};
use substrate_primitives::{H256, Blake2Hasher};
use codec::{Decode, Encode};
// The testing primitives are very useful for avoiding having to work with signatures
// or public keys. `u64` is used as the `AccountId` and no `Signature`s are requried.
@@ -187,28 +201,20 @@ mod tests {
res.copy_from_slice(&keccak256(&alice_public().serialize()[1..65])[12..]);
res
}
fn alice_sig(who: &[u8]) -> EcdsaSignature {
let msg = keccak256(&create_msg(who));
fn alice_sig(what: &[u8]) -> EcdsaSignature {
let msg = keccak256(&ethereum_signable_message(what));
let (sig, recovery_id) = secp256k1::sign(&secp256k1::Message::parse(&msg), &alice_secret()).unwrap();
let sig: ([u8; 32], [u8; 32]) = Decode::decode(&mut &sig.serialize()[..]).unwrap();
(sig.0, sig.1, recovery_id.serialize() as i8)
EcdsaSignature(sig.0, sig.1, recovery_id.serialize() as i8)
}
fn bob_secret() -> secp256k1::SecretKey {
secp256k1::SecretKey::parse(&keccak256(b"Bob")).unwrap()
}
fn bob_public() -> secp256k1::PublicKey {
secp256k1::PublicKey::from_secret_key(&bob_secret())
}
fn bob_eth() -> EthereumAddress {
let mut res = EthereumAddress::default();
res.copy_from_slice(&keccak256(&bob_public().serialize()[1..65])[12..]);
res
}
fn bob_sig(who: &[u8]) -> EcdsaSignature {
let msg = keccak256(&create_msg(who));
fn bob_sig(what: &[u8]) -> EcdsaSignature {
let msg = keccak256(&ethereum_signable_message(what));
let (sig, recovery_id) = secp256k1::sign(&secp256k1::Message::parse(&msg), &bob_secret()).unwrap();
let sig: ([u8; 32], [u8; 32]) = Decode::decode(&mut &sig.serialize()[..]).unwrap();
(sig.0, sig.1, recovery_id.serialize() as i8)
EcdsaSignature(sig.0, sig.1, recovery_id.serialize() as i8)
}
// This function basically just builds a genesis storage key/value store according to
@@ -269,9 +275,8 @@ mod tests {
#[test]
fn real_eth_sig_works() {
let sig = hex!["7505f2880114da51b3f5d535f8687953c0ab9af4ab81e592eaebebf53b728d2b6dfd9b5bcd70fee412b1f31360e7c2774009305cb84fc50c1d0ff8034dfa5fff1c"];
let sig = EcdsaSignature::decode(&mut &sig[..]).unwrap();
let sig = EcdsaSignature::from_blob(&sig);
let who = 42u64.encode();
let msg = create_msg(&who);
let signer = eth_recover(&sig, &who).unwrap();
assert_eq!(signer, hex!["DF67EC7EAe23D2459694685257b6FC59d1BAA1FE"]);
}