1056 lines
34 KiB
Rust
1056 lines
34 KiB
Rust
// Copyright 2015-2017 Parity Technologies (UK) Ltd.
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// This file is part of Parity.
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// Parity is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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use std::cmp::{max, min};
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use std::io::{self, Read};
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use byteorder::{ByteOrder, BigEndian};
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use crypto::sha2::Sha256 as Sha256Digest;
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use crypto::ripemd160::Ripemd160 as Ripemd160Digest;
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use crypto::digest::Digest;
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use num::{BigUint, Zero, One};
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use hash::keccak;
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use ethereum_types::{H256, U256};
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use bytes::BytesRef;
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use ethkey::{Signature, recover as ec_recover};
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use ethjson;
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#[derive(Debug)]
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pub struct Error(pub &'static str);
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impl From<&'static str> for Error {
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fn from(val: &'static str) -> Self {
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Error(val)
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}
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}
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impl Into<::vm::Error> for Error {
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fn into(self) -> ::vm::Error {
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::vm::Error::BuiltIn(self.0)
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}
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}
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/// Native implementation of a built-in contract.
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pub trait Impl: Send + Sync {
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/// execute this built-in on the given input, writing to the given output.
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fn execute(&self, input: &[u8], output: &mut BytesRef) -> Result<(), Error>;
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}
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/// A gas pricing scheme for built-in contracts.
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pub trait Pricer: Send + Sync {
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/// The gas cost of running this built-in for the given input data.
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fn cost(&self, input: &[u8]) -> U256;
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}
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/// A linear pricing model. This computes a price using a base cost and a cost per-word.
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struct Linear {
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base: usize,
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word: usize,
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}
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/// A special pricing model for modular exponentiation.
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struct ModexpPricer {
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divisor: usize,
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}
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impl Pricer for Linear {
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fn cost(&self, input: &[u8]) -> U256 {
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U256::from(self.base) + U256::from(self.word) * U256::from((input.len() + 31) / 32)
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}
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}
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/// A alt_bn128_parinig pricing model. This computes a price using a base cost and a cost per pair.
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struct AltBn128PairingPricer {
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base: usize,
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pair: usize,
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}
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impl Pricer for AltBn128PairingPricer {
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fn cost(&self, input: &[u8]) -> U256 {
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let cost = U256::from(self.base) + U256::from(self.pair) * U256::from(input.len() / 192);
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cost
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}
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}
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impl Pricer for ModexpPricer {
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fn cost(&self, input: &[u8]) -> U256 {
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let mut reader = input.chain(io::repeat(0));
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let mut buf = [0; 32];
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// read lengths as U256 here for accurate gas calculation.
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let mut read_len = || {
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reader.read_exact(&mut buf[..]).expect("reading from zero-extended memory cannot fail; qed");
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U256::from(H256::from_slice(&buf[..]))
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};
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let base_len = read_len();
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let exp_len = read_len();
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let mod_len = read_len();
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if mod_len.is_zero() && base_len.is_zero() {
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return U256::zero()
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}
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let max_len = U256::from(u32::max_value() / 2);
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if base_len > max_len || mod_len > max_len || exp_len > max_len {
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return U256::max_value();
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}
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let (base_len, exp_len, mod_len) = (base_len.low_u64(), exp_len.low_u64(), mod_len.low_u64());
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let m = max(mod_len, base_len);
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// read fist 32-byte word of the exponent.
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let exp_low = if base_len + 96 >= input.len() as u64 { U256::zero() } else {
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let mut buf = [0; 32];
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let mut reader = input[(96 + base_len as usize)..].chain(io::repeat(0));
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let len = min(exp_len, 32) as usize;
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reader.read_exact(&mut buf[(32 - len)..]).expect("reading from zero-extended memory cannot fail; qed");
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U256::from(H256::from_slice(&buf[..]))
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};
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let adjusted_exp_len = Self::adjusted_exp_len(exp_len, exp_low);
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let (gas, overflow) = Self::mult_complexity(m).overflowing_mul(max(adjusted_exp_len, 1));
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if overflow {
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return U256::max_value();
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}
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(gas / self.divisor as u64).into()
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}
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}
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impl ModexpPricer {
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fn adjusted_exp_len(len: u64, exp_low: U256) -> u64 {
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let bit_index = if exp_low.is_zero() { 0 } else { (255 - exp_low.leading_zeros()) as u64 };
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if len <= 32 {
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bit_index
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} else {
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8 * (len - 32) + bit_index
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}
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}
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fn mult_complexity(x: u64) -> u64 {
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match x {
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x if x <= 64 => x * x,
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x if x <= 1024 => (x * x) / 4 + 96 * x - 3072,
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x => (x * x) / 16 + 480 * x - 199680,
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}
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}
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}
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/// Pricing scheme, execution definition, and activation block for a built-in contract.
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///
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/// Call `cost` to compute cost for the given input, `execute` to execute the contract
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/// on the given input, and `is_active` to determine whether the contract is active.
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///
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/// Unless `is_active` is true,
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pub struct Builtin {
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pricer: Box<Pricer>,
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native: Box<Impl>,
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activate_at: u64,
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}
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impl Builtin {
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/// Simple forwarder for cost.
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pub fn cost(&self, input: &[u8]) -> U256 { self.pricer.cost(input) }
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/// Simple forwarder for execute.
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pub fn execute(&self, input: &[u8], output: &mut BytesRef) -> Result<(), Error> {
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self.native.execute(input, output)
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}
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/// Whether the builtin is activated at the given block number.
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pub fn is_active(&self, at: u64) -> bool { at >= self.activate_at }
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}
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impl From<ethjson::spec::Builtin> for Builtin {
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fn from(b: ethjson::spec::Builtin) -> Self {
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let pricer: Box<Pricer> = match b.pricing {
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ethjson::spec::Pricing::Linear(linear) => {
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Box::new(Linear {
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base: linear.base,
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word: linear.word,
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})
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}
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ethjson::spec::Pricing::Modexp(exp) => {
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Box::new(ModexpPricer {
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divisor: if exp.divisor == 0 {
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warn!("Zero modexp divisor specified. Falling back to default.");
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10
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} else {
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exp.divisor
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}
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})
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}
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ethjson::spec::Pricing::AltBn128Pairing(pricer) => {
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Box::new(AltBn128PairingPricer {
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base: pricer.base,
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pair: pricer.pair,
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})
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}
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};
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Builtin {
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pricer: pricer,
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native: ethereum_builtin(&b.name),
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activate_at: b.activate_at.map(Into::into).unwrap_or(0),
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}
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}
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}
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// Ethereum builtin creator.
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fn ethereum_builtin(name: &str) -> Box<Impl> {
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match name {
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"identity" => Box::new(Identity) as Box<Impl>,
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"ecrecover" => Box::new(EcRecover) as Box<Impl>,
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"sha256" => Box::new(Sha256) as Box<Impl>,
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"ripemd160" => Box::new(Ripemd160) as Box<Impl>,
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"modexp" => Box::new(ModexpImpl) as Box<Impl>,
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"alt_bn128_add" => Box::new(Bn128AddImpl) as Box<Impl>,
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"alt_bn128_mul" => Box::new(Bn128MulImpl) as Box<Impl>,
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"alt_bn128_pairing" => Box::new(Bn128PairingImpl) as Box<Impl>,
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_ => panic!("invalid builtin name: {}", name),
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}
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}
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// Ethereum builtins:
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//
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// - The identity function
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// - ec recovery
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// - sha256
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// - ripemd160
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// - modexp (EIP198)
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#[derive(Debug)]
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struct Identity;
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#[derive(Debug)]
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struct EcRecover;
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#[derive(Debug)]
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struct Sha256;
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#[derive(Debug)]
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struct Ripemd160;
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#[derive(Debug)]
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struct ModexpImpl;
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#[derive(Debug)]
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struct Bn128AddImpl;
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#[derive(Debug)]
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struct Bn128MulImpl;
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#[derive(Debug)]
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struct Bn128PairingImpl;
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impl Impl for Identity {
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fn execute(&self, input: &[u8], output: &mut BytesRef) -> Result<(), Error> {
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output.write(0, input);
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Ok(())
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}
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}
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impl Impl for EcRecover {
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fn execute(&self, i: &[u8], output: &mut BytesRef) -> Result<(), Error> {
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let len = min(i.len(), 128);
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let mut input = [0; 128];
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input[..len].copy_from_slice(&i[..len]);
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let hash = H256::from_slice(&input[0..32]);
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let v = H256::from_slice(&input[32..64]);
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let r = H256::from_slice(&input[64..96]);
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let s = H256::from_slice(&input[96..128]);
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let bit = match v[31] {
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27 | 28 if &v.0[..31] == &[0; 31] => v[31] - 27,
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_ => { return Ok(()); },
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};
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let s = Signature::from_rsv(&r, &s, bit);
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if s.is_valid() {
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if let Ok(p) = ec_recover(&s, &hash) {
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let r = keccak(p);
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output.write(0, &[0; 12]);
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output.write(12, &r[12..r.len()]);
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}
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}
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Ok(())
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}
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}
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impl Impl for Sha256 {
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fn execute(&self, input: &[u8], output: &mut BytesRef) -> Result<(), Error> {
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let mut sha = Sha256Digest::new();
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sha.input(input);
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let mut out = [0; 32];
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sha.result(&mut out);
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output.write(0, &out);
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Ok(())
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}
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}
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impl Impl for Ripemd160 {
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fn execute(&self, input: &[u8], output: &mut BytesRef) -> Result<(), Error> {
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let mut sha = Ripemd160Digest::new();
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sha.input(input);
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let mut out = [0; 32];
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sha.result(&mut out[12..32]);
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output.write(0, &out);
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Ok(())
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}
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}
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// calculate modexp: exponentiation by squaring. the `num` crate has pow, but not modular.
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fn modexp(mut base: BigUint, mut exp: BigUint, modulus: BigUint) -> BigUint {
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use num::Integer;
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if modulus <= BigUint::one() { // n^m % 0 || n^m % 1
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return BigUint::zero();
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}
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if exp.is_zero() { // n^0 % m
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return BigUint::one();
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}
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if base.is_zero() { // 0^n % m, n>0
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return BigUint::zero();
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}
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let mut result = BigUint::one();
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base = base % &modulus;
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// fast path for base divisible by modulus.
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if base.is_zero() { return BigUint::zero() }
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while !exp.is_zero() {
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if exp.is_odd() {
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result = (result * &base) % &modulus;
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}
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exp = exp >> 1;
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base = (base.clone() * base) % &modulus;
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}
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result
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}
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impl Impl for ModexpImpl {
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fn execute(&self, input: &[u8], output: &mut BytesRef) -> Result<(), Error> {
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let mut reader = input.chain(io::repeat(0));
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let mut buf = [0; 32];
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// read lengths as usize.
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// ignoring the first 24 bytes might technically lead us to fall out of consensus,
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// but so would running out of addressable memory!
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let mut read_len = |reader: &mut io::Chain<&[u8], io::Repeat>| {
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reader.read_exact(&mut buf[..]).expect("reading from zero-extended memory cannot fail; qed");
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BigEndian::read_u64(&buf[24..]) as usize
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};
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let base_len = read_len(&mut reader);
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let exp_len = read_len(&mut reader);
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let mod_len = read_len(&mut reader);
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// Gas formula allows arbitrary large exp_len when base and modulus are empty, so we need to handle empty base first.
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let r = if base_len == 0 && mod_len == 0 {
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BigUint::zero()
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} else {
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// read the numbers themselves.
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let mut buf = vec![0; max(mod_len, max(base_len, exp_len))];
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let mut read_num = |len| {
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reader.read_exact(&mut buf[..len]).expect("reading from zero-extended memory cannot fail; qed");
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BigUint::from_bytes_be(&buf[..len])
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};
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let base = read_num(base_len);
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let exp = read_num(exp_len);
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let modulus = read_num(mod_len);
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modexp(base, exp, modulus)
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};
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// write output to given memory, left padded and same length as the modulus.
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let bytes = r.to_bytes_be();
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// always true except in the case of zero-length modulus, which leads to
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// output of length and value 1.
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if bytes.len() <= mod_len {
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let res_start = mod_len - bytes.len();
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output.write(res_start, &bytes);
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}
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Ok(())
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}
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}
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fn read_fr(reader: &mut io::Chain<&[u8], io::Repeat>) -> Result<::bn::Fr, Error> {
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let mut buf = [0u8; 32];
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reader.read_exact(&mut buf[..]).expect("reading from zero-extended memory cannot fail; qed");
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::bn::Fr::from_slice(&buf[0..32]).map_err(|_| Error::from("Invalid field element"))
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}
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fn read_point(reader: &mut io::Chain<&[u8], io::Repeat>) -> Result<::bn::G1, Error> {
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use bn::{Fq, AffineG1, G1, Group};
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let mut buf = [0u8; 32];
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reader.read_exact(&mut buf[..]).expect("reading from zero-extended memory cannot fail; qed");
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let px = Fq::from_slice(&buf[0..32]).map_err(|_| Error::from("Invalid point x coordinate"))?;
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reader.read_exact(&mut buf[..]).expect("reading from zero-extended memory cannot fail; qed");
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let py = Fq::from_slice(&buf[0..32]).map_err(|_| Error::from("Invalid point y coordinate"))?;
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Ok(
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if px == Fq::zero() && py == Fq::zero() {
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G1::zero()
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} else {
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AffineG1::new(px, py).map_err(|_| Error::from("Invalid curve point"))?.into()
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}
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)
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}
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impl Impl for Bn128AddImpl {
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// Can fail if any of the 2 points does not belong the bn128 curve
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fn execute(&self, input: &[u8], output: &mut BytesRef) -> Result<(), Error> {
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use bn::AffineG1;
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let mut padded_input = input.chain(io::repeat(0));
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let p1 = read_point(&mut padded_input)?;
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let p2 = read_point(&mut padded_input)?;
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let mut write_buf = [0u8; 64];
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if let Some(sum) = AffineG1::from_jacobian(p1 + p2) {
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// point not at infinity
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sum.x().to_big_endian(&mut write_buf[0..32]).expect("Cannot fail since 0..32 is 32-byte length");
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sum.y().to_big_endian(&mut write_buf[32..64]).expect("Cannot fail since 32..64 is 32-byte length");;
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}
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output.write(0, &write_buf);
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Ok(())
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}
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}
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impl Impl for Bn128MulImpl {
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// Can fail if first paramter (bn128 curve point) does not actually belong to the curve
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fn execute(&self, input: &[u8], output: &mut BytesRef) -> Result<(), Error> {
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use bn::AffineG1;
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let mut padded_input = input.chain(io::repeat(0));
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let p = read_point(&mut padded_input)?;
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let fr = read_fr(&mut padded_input)?;
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let mut write_buf = [0u8; 64];
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if let Some(sum) = AffineG1::from_jacobian(p * fr) {
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// point not at infinity
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sum.x().to_big_endian(&mut write_buf[0..32]).expect("Cannot fail since 0..32 is 32-byte length");
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sum.y().to_big_endian(&mut write_buf[32..64]).expect("Cannot fail since 32..64 is 32-byte length");;
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}
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output.write(0, &write_buf);
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Ok(())
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}
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}
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impl Impl for Bn128PairingImpl {
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/// Can fail if:
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/// - input length is not a multiple of 192
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/// - any of odd points does not belong to bn128 curve
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/// - any of even points does not belong to the twisted bn128 curve over the field F_p^2 = F_p[i] / (i^2 + 1)
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fn execute(&self, input: &[u8], output: &mut BytesRef) -> Result<(), Error> {
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if input.len() % 192 != 0 {
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return Err("Invalid input length, must be multiple of 192 (3 * (32*2))".into())
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}
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if let Err(err) = self.execute_with_error(input, output) {
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trace!("Pairining error: {:?}", err);
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return Err(err)
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}
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Ok(())
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}
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}
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impl Bn128PairingImpl {
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fn execute_with_error(&self, input: &[u8], output: &mut BytesRef) -> Result<(), Error> {
|
|
use bn::{AffineG1, AffineG2, Fq, Fq2, pairing, G1, G2, Gt, Group};
|
|
|
|
let elements = input.len() / 192; // (a, b_a, b_b - each 64-byte affine coordinates)
|
|
let ret_val = if input.len() == 0 {
|
|
U256::one()
|
|
} else {
|
|
let mut vals = Vec::new();
|
|
for idx in 0..elements {
|
|
let a_x = Fq::from_slice(&input[idx*192..idx*192+32])
|
|
.map_err(|_| Error::from("Invalid a argument x coordinate"))?;
|
|
|
|
let a_y = Fq::from_slice(&input[idx*192+32..idx*192+64])
|
|
.map_err(|_| Error::from("Invalid a argument y coordinate"))?;
|
|
|
|
let b_a_y = Fq::from_slice(&input[idx*192+64..idx*192+96])
|
|
.map_err(|_| Error::from("Invalid b argument imaginary coeff x coordinate"))?;
|
|
|
|
let b_a_x = Fq::from_slice(&input[idx*192+96..idx*192+128])
|
|
.map_err(|_| Error::from("Invalid b argument imaginary coeff y coordinate"))?;
|
|
|
|
let b_b_y = Fq::from_slice(&input[idx*192+128..idx*192+160])
|
|
.map_err(|_| Error::from("Invalid b argument real coeff x coordinate"))?;
|
|
|
|
let b_b_x = Fq::from_slice(&input[idx*192+160..idx*192+192])
|
|
.map_err(|_| Error::from("Invalid b argument real coeff y coordinate"))?;
|
|
|
|
let b_a = Fq2::new(b_a_x, b_a_y);
|
|
let b_b = Fq2::new(b_b_x, b_b_y);
|
|
let b = if b_a.is_zero() && b_b.is_zero() {
|
|
G2::zero()
|
|
} else {
|
|
G2::from(AffineG2::new(b_a, b_b).map_err(|_| Error::from("Invalid b argument - not on curve"))?)
|
|
};
|
|
let a = if a_x.is_zero() && a_y.is_zero() {
|
|
G1::zero()
|
|
} else {
|
|
G1::from(AffineG1::new(a_x, a_y).map_err(|_| Error::from("Invalid a argument - not on curve"))?)
|
|
};
|
|
vals.push((a, b));
|
|
};
|
|
|
|
let mul = vals.into_iter().fold(Gt::one(), |s, (a, b)| s * pairing(a, b));
|
|
|
|
if mul == Gt::one() {
|
|
U256::one()
|
|
} else {
|
|
U256::zero()
|
|
}
|
|
};
|
|
|
|
let mut buf = [0u8; 32];
|
|
ret_val.to_big_endian(&mut buf);
|
|
output.write(0, &buf);
|
|
|
|
Ok(())
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::{Builtin, Linear, ethereum_builtin, Pricer, ModexpPricer, modexp as me};
|
|
use ethjson;
|
|
use ethereum_types::U256;
|
|
use bytes::BytesRef;
|
|
use rustc_hex::FromHex;
|
|
use num::{BigUint, Zero, One};
|
|
|
|
#[test]
|
|
fn modexp_func() {
|
|
// n^0 % m == 1
|
|
let mut base = BigUint::parse_bytes(b"12345", 10).unwrap();
|
|
let mut exp = BigUint::zero();
|
|
let mut modulus = BigUint::parse_bytes(b"789", 10).unwrap();
|
|
assert_eq!(me(base, exp, modulus), BigUint::one());
|
|
|
|
// 0^n % m == 0
|
|
base = BigUint::zero();
|
|
exp = BigUint::parse_bytes(b"12345", 10).unwrap();
|
|
modulus = BigUint::parse_bytes(b"789", 10).unwrap();
|
|
assert_eq!(me(base, exp, modulus), BigUint::zero());
|
|
|
|
// n^m % 1 == 0
|
|
base = BigUint::parse_bytes(b"12345", 10).unwrap();
|
|
exp = BigUint::parse_bytes(b"789", 10).unwrap();
|
|
modulus = BigUint::one();
|
|
assert_eq!(me(base, exp, modulus), BigUint::zero());
|
|
|
|
// if n % d == 0, then n^m % d == 0
|
|
base = BigUint::parse_bytes(b"12345", 10).unwrap();
|
|
exp = BigUint::parse_bytes(b"789", 10).unwrap();
|
|
modulus = BigUint::parse_bytes(b"15", 10).unwrap();
|
|
assert_eq!(me(base, exp, modulus), BigUint::zero());
|
|
|
|
// others
|
|
base = BigUint::parse_bytes(b"12345", 10).unwrap();
|
|
exp = BigUint::parse_bytes(b"789", 10).unwrap();
|
|
modulus = BigUint::parse_bytes(b"97", 10).unwrap();
|
|
assert_eq!(me(base, exp, modulus), BigUint::parse_bytes(b"55", 10).unwrap());
|
|
}
|
|
|
|
#[test]
|
|
fn identity() {
|
|
let f = ethereum_builtin("identity");
|
|
|
|
let i = [0u8, 1, 2, 3];
|
|
|
|
let mut o2 = [255u8; 2];
|
|
f.execute(&i[..], &mut BytesRef::Fixed(&mut o2[..])).expect("Builtin should not fail");
|
|
assert_eq!(i[0..2], o2);
|
|
|
|
let mut o4 = [255u8; 4];
|
|
f.execute(&i[..], &mut BytesRef::Fixed(&mut o4[..])).expect("Builtin should not fail");
|
|
assert_eq!(i, o4);
|
|
|
|
let mut o8 = [255u8; 8];
|
|
f.execute(&i[..], &mut BytesRef::Fixed(&mut o8[..])).expect("Builtin should not fail");
|
|
assert_eq!(i, o8[..4]);
|
|
assert_eq!([255u8; 4], o8[4..]);
|
|
}
|
|
|
|
#[test]
|
|
fn sha256() {
|
|
let f = ethereum_builtin("sha256");
|
|
|
|
let i = [0u8; 0];
|
|
|
|
let mut o = [255u8; 32];
|
|
f.execute(&i[..], &mut BytesRef::Fixed(&mut o[..])).expect("Builtin should not fail");
|
|
assert_eq!(&o[..], &(FromHex::from_hex("e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855").unwrap())[..]);
|
|
|
|
let mut o8 = [255u8; 8];
|
|
f.execute(&i[..], &mut BytesRef::Fixed(&mut o8[..])).expect("Builtin should not fail");
|
|
assert_eq!(&o8[..], &(FromHex::from_hex("e3b0c44298fc1c14").unwrap())[..]);
|
|
|
|
let mut o34 = [255u8; 34];
|
|
f.execute(&i[..], &mut BytesRef::Fixed(&mut o34[..])).expect("Builtin should not fail");
|
|
assert_eq!(&o34[..], &(FromHex::from_hex("e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855ffff").unwrap())[..]);
|
|
|
|
let mut ov = vec![];
|
|
f.execute(&i[..], &mut BytesRef::Flexible(&mut ov)).expect("Builtin should not fail");
|
|
assert_eq!(&ov[..], &(FromHex::from_hex("e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855").unwrap())[..]);
|
|
}
|
|
|
|
#[test]
|
|
fn ripemd160() {
|
|
let f = ethereum_builtin("ripemd160");
|
|
|
|
let i = [0u8; 0];
|
|
|
|
let mut o = [255u8; 32];
|
|
f.execute(&i[..], &mut BytesRef::Fixed(&mut o[..])).expect("Builtin should not fail");
|
|
assert_eq!(&o[..], &(FromHex::from_hex("0000000000000000000000009c1185a5c5e9fc54612808977ee8f548b2258d31").unwrap())[..]);
|
|
|
|
let mut o8 = [255u8; 8];
|
|
f.execute(&i[..], &mut BytesRef::Fixed(&mut o8[..])).expect("Builtin should not fail");
|
|
assert_eq!(&o8[..], &(FromHex::from_hex("0000000000000000").unwrap())[..]);
|
|
|
|
let mut o34 = [255u8; 34];
|
|
f.execute(&i[..], &mut BytesRef::Fixed(&mut o34[..])).expect("Builtin should not fail");
|
|
assert_eq!(&o34[..], &(FromHex::from_hex("0000000000000000000000009c1185a5c5e9fc54612808977ee8f548b2258d31ffff").unwrap())[..]);
|
|
}
|
|
|
|
#[test]
|
|
fn ecrecover() {
|
|
let f = ethereum_builtin("ecrecover");
|
|
|
|
let i = FromHex::from_hex("47173285a8d7341e5e972fc677286384f802f8ef42a5ec5f03bbfa254cb01fad000000000000000000000000000000000000000000000000000000000000001b650acf9d3f5f0a2c799776a1254355d5f4061762a237396a99a0e0e3fc2bcd6729514a0dacb2e623ac4abd157cb18163ff942280db4d5caad66ddf941ba12e03").unwrap();
|
|
|
|
let mut o = [255u8; 32];
|
|
f.execute(&i[..], &mut BytesRef::Fixed(&mut o[..])).expect("Builtin should not fail");
|
|
assert_eq!(&o[..], &(FromHex::from_hex("000000000000000000000000c08b5542d177ac6686946920409741463a15dddb").unwrap())[..]);
|
|
|
|
let mut o8 = [255u8; 8];
|
|
f.execute(&i[..], &mut BytesRef::Fixed(&mut o8[..])).expect("Builtin should not fail");
|
|
assert_eq!(&o8[..], &(FromHex::from_hex("0000000000000000").unwrap())[..]);
|
|
|
|
let mut o34 = [255u8; 34];
|
|
f.execute(&i[..], &mut BytesRef::Fixed(&mut o34[..])).expect("Builtin should not fail");
|
|
assert_eq!(&o34[..], &(FromHex::from_hex("000000000000000000000000c08b5542d177ac6686946920409741463a15dddbffff").unwrap())[..]);
|
|
|
|
let i_bad = FromHex::from_hex("47173285a8d7341e5e972fc677286384f802f8ef42a5ec5f03bbfa254cb01fad000000000000000000000000000000000000000000000000000000000000001a650acf9d3f5f0a2c799776a1254355d5f4061762a237396a99a0e0e3fc2bcd6729514a0dacb2e623ac4abd157cb18163ff942280db4d5caad66ddf941ba12e03").unwrap();
|
|
let mut o = [255u8; 32];
|
|
f.execute(&i_bad[..], &mut BytesRef::Fixed(&mut o[..])).expect("Builtin should not fail");
|
|
assert_eq!(&o[..], &(FromHex::from_hex("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap())[..]);
|
|
|
|
let i_bad = FromHex::from_hex("47173285a8d7341e5e972fc677286384f802f8ef42a5ec5f03bbfa254cb01fad000000000000000000000000000000000000000000000000000000000000001b000000000000000000000000000000000000000000000000000000000000001b0000000000000000000000000000000000000000000000000000000000000000").unwrap();
|
|
let mut o = [255u8; 32];
|
|
f.execute(&i_bad[..], &mut BytesRef::Fixed(&mut o[..])).expect("Builtin should not fail");
|
|
assert_eq!(&o[..], &(FromHex::from_hex("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap())[..]);
|
|
|
|
let i_bad = FromHex::from_hex("47173285a8d7341e5e972fc677286384f802f8ef42a5ec5f03bbfa254cb01fad000000000000000000000000000000000000000000000000000000000000001b0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001b").unwrap();
|
|
let mut o = [255u8; 32];
|
|
f.execute(&i_bad[..], &mut BytesRef::Fixed(&mut o[..])).expect("Builtin should not fail");
|
|
assert_eq!(&o[..], &(FromHex::from_hex("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap())[..]);
|
|
|
|
let i_bad = FromHex::from_hex("47173285a8d7341e5e972fc677286384f802f8ef42a5ec5f03bbfa254cb01fad000000000000000000000000000000000000000000000000000000000000001bffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff000000000000000000000000000000000000000000000000000000000000001b").unwrap();
|
|
let mut o = [255u8; 32];
|
|
f.execute(&i_bad[..], &mut BytesRef::Fixed(&mut o[..])).expect("Builtin should not fail");
|
|
assert_eq!(&o[..], &(FromHex::from_hex("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap())[..]);
|
|
|
|
let i_bad = FromHex::from_hex("47173285a8d7341e5e972fc677286384f802f8ef42a5ec5f03bbfa254cb01fad000000000000000000000000000000000000000000000000000000000000001b000000000000000000000000000000000000000000000000000000000000001bffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap();
|
|
let mut o = [255u8; 32];
|
|
f.execute(&i_bad[..], &mut BytesRef::Fixed(&mut o[..])).expect("Builtin should not fail");
|
|
assert_eq!(&o[..], &(FromHex::from_hex("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap())[..]);
|
|
|
|
// TODO: Should this (corrupted version of the above) fail rather than returning some address?
|
|
/* let i_bad = FromHex::from_hex("48173285a8d7341e5e972fc677286384f802f8ef42a5ec5f03bbfa254cb01fad000000000000000000000000000000000000000000000000000000000000001b650acf9d3f5f0a2c799776a1254355d5f4061762a237396a99a0e0e3fc2bcd6729514a0dacb2e623ac4abd157cb18163ff942280db4d5caad66ddf941ba12e03").unwrap();
|
|
let mut o = [255u8; 32];
|
|
f.execute(&i_bad[..], &mut BytesRef::Fixed(&mut o[..]));
|
|
assert_eq!(&o[..], &(FromHex::from_hex("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap())[..]);*/
|
|
}
|
|
|
|
#[test]
|
|
fn modexp() {
|
|
|
|
let f = Builtin {
|
|
pricer: Box::new(ModexpPricer { divisor: 20 }),
|
|
native: ethereum_builtin("modexp"),
|
|
activate_at: 0,
|
|
};
|
|
|
|
// test for potential gas cost multiplication overflow
|
|
{
|
|
let input = FromHex::from_hex("0000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000000003b27bafd00000000000000000000000000000000000000000000000000000000503c8ac3").unwrap();
|
|
let expected_cost = U256::max_value();
|
|
assert_eq!(f.cost(&input[..]), expected_cost.into());
|
|
}
|
|
|
|
|
|
// test for potential exp len overflow
|
|
{
|
|
let input = FromHex::from_hex("\
|
|
00000000000000000000000000000000000000000000000000000000000000ff\
|
|
2a1e530000000000000000000000000000000000000000000000000000000000\
|
|
0000000000000000000000000000000000000000000000000000000000000000"
|
|
).unwrap();
|
|
|
|
let mut output = vec![0u8; 32];
|
|
let expected = FromHex::from_hex("0000000000000000000000000000000000000000000000000000000000000000").unwrap();
|
|
let expected_cost = U256::max_value();
|
|
|
|
f.execute(&input[..], &mut BytesRef::Fixed(&mut output[..])).expect("Builtin should fail");
|
|
assert_eq!(output, expected);
|
|
assert_eq!(f.cost(&input[..]), expected_cost.into());
|
|
}
|
|
|
|
// fermat's little theorem example.
|
|
{
|
|
let input = FromHex::from_hex("\
|
|
0000000000000000000000000000000000000000000000000000000000000001\
|
|
0000000000000000000000000000000000000000000000000000000000000020\
|
|
0000000000000000000000000000000000000000000000000000000000000020\
|
|
03\
|
|
fffffffffffffffffffffffffffffffffffffffffffffffffffffffefffffc2e\
|
|
fffffffffffffffffffffffffffffffffffffffffffffffffffffffefffffc2f"
|
|
).unwrap();
|
|
|
|
let mut output = vec![0u8; 32];
|
|
let expected = FromHex::from_hex("0000000000000000000000000000000000000000000000000000000000000001").unwrap();
|
|
let expected_cost = 13056;
|
|
|
|
f.execute(&input[..], &mut BytesRef::Fixed(&mut output[..])).expect("Builtin should not fail");
|
|
assert_eq!(output, expected);
|
|
assert_eq!(f.cost(&input[..]), expected_cost.into());
|
|
}
|
|
|
|
// second example from EIP: zero base.
|
|
{
|
|
let input = FromHex::from_hex("\
|
|
0000000000000000000000000000000000000000000000000000000000000000\
|
|
0000000000000000000000000000000000000000000000000000000000000020\
|
|
0000000000000000000000000000000000000000000000000000000000000020\
|
|
fffffffffffffffffffffffffffffffffffffffffffffffffffffffefffffc2e\
|
|
fffffffffffffffffffffffffffffffffffffffffffffffffffffffefffffc2f"
|
|
).unwrap();
|
|
|
|
let mut output = vec![0u8; 32];
|
|
let expected = FromHex::from_hex("0000000000000000000000000000000000000000000000000000000000000000").unwrap();
|
|
let expected_cost = 13056;
|
|
|
|
f.execute(&input[..], &mut BytesRef::Fixed(&mut output[..])).expect("Builtin should not fail");
|
|
assert_eq!(output, expected);
|
|
assert_eq!(f.cost(&input[..]), expected_cost.into());
|
|
}
|
|
|
|
// another example from EIP: zero-padding
|
|
{
|
|
let input = FromHex::from_hex("\
|
|
0000000000000000000000000000000000000000000000000000000000000001\
|
|
0000000000000000000000000000000000000000000000000000000000000002\
|
|
0000000000000000000000000000000000000000000000000000000000000020\
|
|
03\
|
|
ffff\
|
|
80"
|
|
).unwrap();
|
|
|
|
let mut output = vec![0u8; 32];
|
|
let expected = FromHex::from_hex("3b01b01ac41f2d6e917c6d6a221ce793802469026d9ab7578fa2e79e4da6aaab").unwrap();
|
|
let expected_cost = 768;
|
|
|
|
f.execute(&input[..], &mut BytesRef::Fixed(&mut output[..])).expect("Builtin should not fail");
|
|
assert_eq!(output, expected);
|
|
assert_eq!(f.cost(&input[..]), expected_cost.into());
|
|
}
|
|
|
|
// zero-length modulus.
|
|
{
|
|
let input = FromHex::from_hex("\
|
|
0000000000000000000000000000000000000000000000000000000000000001\
|
|
0000000000000000000000000000000000000000000000000000000000000002\
|
|
0000000000000000000000000000000000000000000000000000000000000000\
|
|
03\
|
|
ffff"
|
|
).unwrap();
|
|
|
|
let mut output = vec![];
|
|
let expected_cost = 0;
|
|
|
|
f.execute(&input[..], &mut BytesRef::Flexible(&mut output)).expect("Builtin should not fail");
|
|
assert_eq!(output.len(), 0); // shouldn't have written any output.
|
|
assert_eq!(f.cost(&input[..]), expected_cost.into());
|
|
}
|
|
}
|
|
|
|
#[test]
|
|
fn bn128_add() {
|
|
|
|
let f = Builtin {
|
|
pricer: Box::new(Linear { base: 0, word: 0 }),
|
|
native: ethereum_builtin("alt_bn128_add"),
|
|
activate_at: 0,
|
|
};
|
|
|
|
// zero-points additions
|
|
{
|
|
let input = FromHex::from_hex("\
|
|
0000000000000000000000000000000000000000000000000000000000000000\
|
|
0000000000000000000000000000000000000000000000000000000000000000\
|
|
0000000000000000000000000000000000000000000000000000000000000000\
|
|
0000000000000000000000000000000000000000000000000000000000000000"
|
|
).unwrap();
|
|
|
|
let mut output = vec![0u8; 64];
|
|
let expected = FromHex::from_hex("\
|
|
0000000000000000000000000000000000000000000000000000000000000000\
|
|
0000000000000000000000000000000000000000000000000000000000000000"
|
|
).unwrap();
|
|
|
|
f.execute(&input[..], &mut BytesRef::Fixed(&mut output[..])).expect("Builtin should not fail");
|
|
assert_eq!(output, expected);
|
|
}
|
|
|
|
|
|
// no input, should not fail
|
|
{
|
|
let mut empty = [0u8; 0];
|
|
let input = BytesRef::Fixed(&mut empty);
|
|
|
|
let mut output = vec![0u8; 64];
|
|
let expected = FromHex::from_hex("\
|
|
0000000000000000000000000000000000000000000000000000000000000000\
|
|
0000000000000000000000000000000000000000000000000000000000000000"
|
|
).unwrap();
|
|
|
|
f.execute(&input[..], &mut BytesRef::Fixed(&mut output[..])).expect("Builtin should not fail");
|
|
assert_eq!(output, expected);
|
|
}
|
|
|
|
// should fail - point not on curve
|
|
{
|
|
let input = FromHex::from_hex("\
|
|
1111111111111111111111111111111111111111111111111111111111111111\
|
|
1111111111111111111111111111111111111111111111111111111111111111\
|
|
1111111111111111111111111111111111111111111111111111111111111111\
|
|
1111111111111111111111111111111111111111111111111111111111111111"
|
|
).unwrap();
|
|
|
|
let mut output = vec![0u8; 64];
|
|
|
|
let res = f.execute(&input[..], &mut BytesRef::Fixed(&mut output[..]));
|
|
assert!(res.is_err(), "There should be built-in error here");
|
|
}
|
|
}
|
|
|
|
|
|
#[test]
|
|
fn bn128_mul() {
|
|
|
|
let f = Builtin {
|
|
pricer: Box::new(Linear { base: 0, word: 0 }),
|
|
native: ethereum_builtin("alt_bn128_mul"),
|
|
activate_at: 0,
|
|
};
|
|
|
|
// zero-point multiplication
|
|
{
|
|
let input = FromHex::from_hex("\
|
|
0000000000000000000000000000000000000000000000000000000000000000\
|
|
0000000000000000000000000000000000000000000000000000000000000000\
|
|
0200000000000000000000000000000000000000000000000000000000000000"
|
|
).unwrap();
|
|
|
|
let mut output = vec![0u8; 64];
|
|
let expected = FromHex::from_hex("\
|
|
0000000000000000000000000000000000000000000000000000000000000000\
|
|
0000000000000000000000000000000000000000000000000000000000000000"
|
|
).unwrap();
|
|
|
|
f.execute(&input[..], &mut BytesRef::Fixed(&mut output[..])).expect("Builtin should not fail");
|
|
assert_eq!(output, expected);
|
|
}
|
|
|
|
// should fail - point not on curve
|
|
{
|
|
let input = FromHex::from_hex("\
|
|
1111111111111111111111111111111111111111111111111111111111111111\
|
|
1111111111111111111111111111111111111111111111111111111111111111\
|
|
0f00000000000000000000000000000000000000000000000000000000000000"
|
|
).unwrap();
|
|
|
|
let mut output = vec![0u8; 64];
|
|
|
|
let res = f.execute(&input[..], &mut BytesRef::Fixed(&mut output[..]));
|
|
assert!(res.is_err(), "There should be built-in error here");
|
|
}
|
|
}
|
|
|
|
fn builtin_pairing() -> Builtin {
|
|
Builtin {
|
|
pricer: Box::new(Linear { base: 0, word: 0 }),
|
|
native: ethereum_builtin("alt_bn128_pairing"),
|
|
activate_at: 0,
|
|
}
|
|
}
|
|
|
|
fn empty_test(f: Builtin, expected: Vec<u8>) {
|
|
let mut empty = [0u8; 0];
|
|
let input = BytesRef::Fixed(&mut empty);
|
|
|
|
let mut output = vec![0u8; expected.len()];
|
|
|
|
f.execute(&input[..], &mut BytesRef::Fixed(&mut output[..])).expect("Builtin should not fail");
|
|
assert_eq!(output, expected);
|
|
}
|
|
|
|
fn error_test(f: Builtin, input: &[u8], msg_contains: Option<&str>) {
|
|
let mut output = vec![0u8; 64];
|
|
let res = f.execute(input, &mut BytesRef::Fixed(&mut output[..]));
|
|
if let Some(msg) = msg_contains {
|
|
if let Err(e) = res {
|
|
if !e.0.contains(msg) {
|
|
panic!("There should be error containing '{}' here, but got: '{}'", msg, e.0);
|
|
}
|
|
}
|
|
} else {
|
|
assert!(res.is_err(), "There should be built-in error here");
|
|
}
|
|
}
|
|
|
|
fn bytes(s: &'static str) -> Vec<u8> {
|
|
FromHex::from_hex(s).expect("static str should contain valid hex bytes")
|
|
}
|
|
|
|
#[test]
|
|
fn bn128_pairing_empty() {
|
|
// should not fail, because empty input is a valid input of 0 elements
|
|
empty_test(
|
|
builtin_pairing(),
|
|
bytes("0000000000000000000000000000000000000000000000000000000000000001"),
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn bn128_pairing_notcurve() {
|
|
// should fail - point not on curve
|
|
error_test(
|
|
builtin_pairing(),
|
|
&bytes("\
|
|
1111111111111111111111111111111111111111111111111111111111111111\
|
|
1111111111111111111111111111111111111111111111111111111111111111\
|
|
1111111111111111111111111111111111111111111111111111111111111111\
|
|
1111111111111111111111111111111111111111111111111111111111111111\
|
|
1111111111111111111111111111111111111111111111111111111111111111\
|
|
1111111111111111111111111111111111111111111111111111111111111111"
|
|
),
|
|
Some("not on curve"),
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn bn128_pairing_fragmented() {
|
|
// should fail - input length is invalid
|
|
error_test(
|
|
builtin_pairing(),
|
|
&bytes("\
|
|
1111111111111111111111111111111111111111111111111111111111111111\
|
|
1111111111111111111111111111111111111111111111111111111111111111\
|
|
111111111111111111111111111111"
|
|
),
|
|
Some("Invalid input length"),
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
#[should_panic]
|
|
fn from_unknown_linear() {
|
|
let _ = ethereum_builtin("foo");
|
|
}
|
|
|
|
#[test]
|
|
fn is_active() {
|
|
let pricer = Box::new(Linear { base: 10, word: 20} );
|
|
let b = Builtin {
|
|
pricer: pricer as Box<Pricer>,
|
|
native: ethereum_builtin("identity"),
|
|
activate_at: 100_000,
|
|
};
|
|
|
|
assert!(!b.is_active(99_999));
|
|
assert!(b.is_active(100_000));
|
|
assert!(b.is_active(100_001));
|
|
}
|
|
|
|
#[test]
|
|
fn from_named_linear() {
|
|
let pricer = Box::new(Linear { base: 10, word: 20 });
|
|
let b = Builtin {
|
|
pricer: pricer as Box<Pricer>,
|
|
native: ethereum_builtin("identity"),
|
|
activate_at: 1,
|
|
};
|
|
|
|
assert_eq!(b.cost(&[0; 0]), U256::from(10));
|
|
assert_eq!(b.cost(&[0; 1]), U256::from(30));
|
|
assert_eq!(b.cost(&[0; 32]), U256::from(30));
|
|
assert_eq!(b.cost(&[0; 33]), U256::from(50));
|
|
|
|
let i = [0u8, 1, 2, 3];
|
|
let mut o = [255u8; 4];
|
|
b.execute(&i[..], &mut BytesRef::Fixed(&mut o[..])).expect("Builtin should not fail");
|
|
assert_eq!(i, o);
|
|
}
|
|
|
|
#[test]
|
|
fn from_json() {
|
|
let b = Builtin::from(ethjson::spec::Builtin {
|
|
name: "identity".to_owned(),
|
|
pricing: ethjson::spec::Pricing::Linear(ethjson::spec::Linear {
|
|
base: 10,
|
|
word: 20,
|
|
}),
|
|
activate_at: None,
|
|
});
|
|
|
|
assert_eq!(b.cost(&[0; 0]), U256::from(10));
|
|
assert_eq!(b.cost(&[0; 1]), U256::from(30));
|
|
assert_eq!(b.cost(&[0; 32]), U256::from(30));
|
|
assert_eq!(b.cost(&[0; 33]), U256::from(50));
|
|
|
|
let i = [0u8, 1, 2, 3];
|
|
let mut o = [255u8; 4];
|
|
b.execute(&i[..], &mut BytesRef::Fixed(&mut o[..])).expect("Builtin should not fail");
|
|
assert_eq!(i, o);
|
|
}
|
|
}
|