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use crypto::publickey::{public_to_address, recover, Signature};
use ethereum_types::{H256, U64};
use hash::keccak;
use jsonrpc_core::Result;
use v1::{
helpers::{dispatch::eth_data_hash, errors},
types::{Bytes, RecoveredAccount},
};
pub fn verify_signature(
is_prefixed: bool,
message: Bytes,
r: H256,
s: H256,
v: U64,
chain_id: Option<u64>,
) -> Result<RecoveredAccount> {
let hash = if is_prefixed {
eth_data_hash(message.0)
} else {
keccak(message.0)
};
let v = v.as_u64();
let is_valid_for_current_chain = match (chain_id, v) {
(None, v) if v == 0 || v == 1 => true,
(Some(chain_id), v) if v >= 35 => (v - 35) / 2 == chain_id,
_ => false,
};
let v = if v >= 35 { (v - 1) % 2 } else { v };
let signature = Signature::from_rsv(&r, &s, v as u8);
let public_key = recover(&signature, &hash).map_err(errors::encryption)?;
let address = public_to_address(&public_key);
Ok(RecoveredAccount {
address,
public_key,
is_valid_for_current_chain,
})
}
#[cfg(test)]
mod tests {
use super::*;
use crypto::publickey::{self, Generator};
use ethereum_types::{H160, U64};
pub fn add_chain_replay_protection(v: u64, chain_id: Option<u64>) -> u64 {
v + if let Some(n) = chain_id {
35 + n * 2
} else {
0
}
}
struct TestCase {
should_prefix: bool,
signing_chain_id: Option<u64>,
rpc_chain_id: Option<u64>,
is_valid_for_current_chain: bool,
}
fn sign(
should_prefix: bool,
data: Vec<u8>,
signing_chain_id: Option<u64>,
) -> (H160, [u8; 32], [u8; 32], U64) {
let hash = if should_prefix {
eth_data_hash(data)
} else {
keccak(data)
};
let account = publickey::Random.generate();
let address = account.address();
let sig = publickey::sign(account.secret(), &hash).unwrap();
let (r, s, v) = (sig.r(), sig.s(), sig.v());
let v = add_chain_replay_protection(v as u64, signing_chain_id);
let (r_buf, s_buf) = {
let (mut r_buf, mut s_buf) = ([0u8; 32], [0u8; 32]);
r_buf.copy_from_slice(r);
s_buf.copy_from_slice(s);
(r_buf, s_buf)
};
(address.into(), r_buf, s_buf, v.into())
}
fn run_test(test_case: TestCase) {
let TestCase {
should_prefix,
signing_chain_id,
rpc_chain_id,
is_valid_for_current_chain,
} = test_case;
let data = vec![5u8];
let (address, r, s, v) = sign(should_prefix, data.clone(), signing_chain_id);
let account = verify_signature(
should_prefix,
data.into(),
r.into(),
s.into(),
v,
rpc_chain_id,
)
.unwrap();
assert_eq!(account.address, address.into());
assert_eq!(
account.is_valid_for_current_chain,
is_valid_for_current_chain
)
}
#[test]
fn test_verify_signature_prefixed_mainnet() {
run_test(TestCase {
should_prefix: true,
signing_chain_id: Some(1),
rpc_chain_id: Some(1),
is_valid_for_current_chain: true,
})
}
#[test]
fn test_verify_signature_not_prefixed_mainnet() {
run_test(TestCase {
should_prefix: false,
signing_chain_id: Some(1),
rpc_chain_id: Some(1),
is_valid_for_current_chain: true,
})
}
#[test]
fn test_verify_signature_incompatible_chain_id() {
run_test(TestCase {
should_prefix: false,
signing_chain_id: Some(65),
rpc_chain_id: Some(1),
is_valid_for_current_chain: false,
});
run_test(TestCase {
should_prefix: true,
signing_chain_id: Some(65),
rpc_chain_id: Some(1),
is_valid_for_current_chain: false,
});
}
#[test]
fn test_verify_signature_no_signing_chain_id() {
run_test(TestCase {
should_prefix: false,
signing_chain_id: None,
rpc_chain_id: Some(1),
is_valid_for_current_chain: false,
});
run_test(TestCase {
should_prefix: true,
signing_chain_id: None,
rpc_chain_id: Some(1),
is_valid_for_current_chain: false,
});
}
#[test]
fn test_verify_signature_no_rpc_chain_id() {
run_test(TestCase {
should_prefix: false,
signing_chain_id: Some(1),
rpc_chain_id: None,
is_valid_for_current_chain: false,
});
run_test(TestCase {
should_prefix: true,
signing_chain_id: Some(1),
rpc_chain_id: None,
is_valid_for_current_chain: false,
});
}
#[test]
fn test_verify_signature_no_chain_replay_protection() {
run_test(TestCase {
should_prefix: false,
signing_chain_id: None,
rpc_chain_id: None,
is_valid_for_current_chain: true,
});
run_test(TestCase {
should_prefix: true,
signing_chain_id: None,
rpc_chain_id: None,
is_valid_for_current_chain: true,
});
}
}
