344 lines
12 KiB
Rust
344 lines
12 KiB
Rust
// Copyright 2015, 2016 Ethcore (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 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 std::cmp::min;
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use util::{U256, H256, Hashable, FixedHash, BytesRef};
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use ethkey::{Signature, recover as ec_recover};
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use ethjson;
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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);
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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 size of input data.
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fn cost(&self, in_size: usize) -> 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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impl Pricer for Linear {
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fn cost(&self, in_size: usize) -> U256 {
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U256::from(self.base) + U256::from(self.word) * U256::from((in_size + 31) / 32)
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}
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}
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/// Pricing scheme and execution definition for a built-in contract.
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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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}
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impl Builtin {
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/// Simple forwarder for cost.
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pub fn cost(&self, s: usize) -> U256 { self.pricer.cost(s) }
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/// Simple forwarder for execute.
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pub fn execute(&self, input: &[u8], output: &mut BytesRef) { self.native.execute(input, output) }
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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 = 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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};
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Builtin {
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pricer: pricer,
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native: ethereum_builtin(&b.name),
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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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_ => 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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#[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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impl Impl for Identity {
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fn execute(&self, input: &[u8], output: &mut BytesRef) {
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output.write(0, input);
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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) {
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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,
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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 = p.sha3();
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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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}
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}
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impl Impl for Sha256 {
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fn execute(&self, input: &[u8], output: &mut BytesRef) {
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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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}
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}
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impl Impl for Ripemd160 {
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fn execute(&self, input: &[u8], output: &mut BytesRef) {
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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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}
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}
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#[cfg(test)]
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mod tests {
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use super::{Builtin, Linear, ethereum_builtin, Pricer};
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use ethjson;
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use util::{U256, BytesRef};
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#[test]
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fn identity() {
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let f = ethereum_builtin("identity");
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let i = [0u8, 1, 2, 3];
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let mut o2 = [255u8; 2];
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f.execute(&i[..], &mut BytesRef::Fixed(&mut o2[..]));
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assert_eq!(i[0..2], o2);
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let mut o4 = [255u8; 4];
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f.execute(&i[..], &mut BytesRef::Fixed(&mut o4[..]));
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assert_eq!(i, o4);
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let mut o8 = [255u8; 8];
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f.execute(&i[..], &mut BytesRef::Fixed(&mut o8[..]));
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assert_eq!(i, o8[..4]);
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assert_eq!([255u8; 4], o8[4..]);
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}
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#[test]
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fn sha256() {
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use rustc_serialize::hex::FromHex;
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let f = ethereum_builtin("sha256");
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let i = [0u8; 0];
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let mut o = [255u8; 32];
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f.execute(&i[..], &mut BytesRef::Fixed(&mut o[..]));
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assert_eq!(&o[..], &(FromHex::from_hex("e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855").unwrap())[..]);
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let mut o8 = [255u8; 8];
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f.execute(&i[..], &mut BytesRef::Fixed(&mut o8[..]));
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assert_eq!(&o8[..], &(FromHex::from_hex("e3b0c44298fc1c14").unwrap())[..]);
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let mut o34 = [255u8; 34];
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f.execute(&i[..], &mut BytesRef::Fixed(&mut o34[..]));
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assert_eq!(&o34[..], &(FromHex::from_hex("e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855ffff").unwrap())[..]);
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let mut ov = vec![];
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f.execute(&i[..], &mut BytesRef::Flexible(&mut ov));
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assert_eq!(&ov[..], &(FromHex::from_hex("e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855").unwrap())[..]);
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}
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#[test]
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fn ripemd160() {
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use rustc_serialize::hex::FromHex;
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let f = ethereum_builtin("ripemd160");
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let i = [0u8; 0];
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let mut o = [255u8; 32];
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f.execute(&i[..], &mut BytesRef::Fixed(&mut o[..]));
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assert_eq!(&o[..], &(FromHex::from_hex("0000000000000000000000009c1185a5c5e9fc54612808977ee8f548b2258d31").unwrap())[..]);
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let mut o8 = [255u8; 8];
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f.execute(&i[..], &mut BytesRef::Fixed(&mut o8[..]));
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assert_eq!(&o8[..], &(FromHex::from_hex("0000000000000000").unwrap())[..]);
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let mut o34 = [255u8; 34];
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f.execute(&i[..], &mut BytesRef::Fixed(&mut o34[..]));
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assert_eq!(&o34[..], &(FromHex::from_hex("0000000000000000000000009c1185a5c5e9fc54612808977ee8f548b2258d31ffff").unwrap())[..]);
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}
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#[test]
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fn ecrecover() {
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use rustc_serialize::hex::FromHex;
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/*let k = KeyPair::from_secret(b"test".sha3()).unwrap();
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let a: Address = From::from(k.public().sha3());
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println!("Address: {}", a);
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let m = b"hello world".sha3();
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println!("Message: {}", m);
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let s = k.sign(&m).unwrap();
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println!("Signed: {}", s);*/
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let f = ethereum_builtin("ecrecover");
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let i = FromHex::from_hex("47173285a8d7341e5e972fc677286384f802f8ef42a5ec5f03bbfa254cb01fad000000000000000000000000000000000000000000000000000000000000001b650acf9d3f5f0a2c799776a1254355d5f4061762a237396a99a0e0e3fc2bcd6729514a0dacb2e623ac4abd157cb18163ff942280db4d5caad66ddf941ba12e03").unwrap();
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let mut o = [255u8; 32];
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f.execute(&i[..], &mut BytesRef::Fixed(&mut o[..]));
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assert_eq!(&o[..], &(FromHex::from_hex("000000000000000000000000c08b5542d177ac6686946920409741463a15dddb").unwrap())[..]);
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let mut o8 = [255u8; 8];
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f.execute(&i[..], &mut BytesRef::Fixed(&mut o8[..]));
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assert_eq!(&o8[..], &(FromHex::from_hex("0000000000000000").unwrap())[..]);
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let mut o34 = [255u8; 34];
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f.execute(&i[..], &mut BytesRef::Fixed(&mut o34[..]));
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assert_eq!(&o34[..], &(FromHex::from_hex("000000000000000000000000c08b5542d177ac6686946920409741463a15dddbffff").unwrap())[..]);
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let i_bad = FromHex::from_hex("47173285a8d7341e5e972fc677286384f802f8ef42a5ec5f03bbfa254cb01fad000000000000000000000000000000000000000000000000000000000000001a650acf9d3f5f0a2c799776a1254355d5f4061762a237396a99a0e0e3fc2bcd6729514a0dacb2e623ac4abd157cb18163ff942280db4d5caad66ddf941ba12e03").unwrap();
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let mut o = [255u8; 32];
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f.execute(&i_bad[..], &mut BytesRef::Fixed(&mut o[..]));
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assert_eq!(&o[..], &(FromHex::from_hex("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap())[..]);
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let i_bad = FromHex::from_hex("47173285a8d7341e5e972fc677286384f802f8ef42a5ec5f03bbfa254cb01fad000000000000000000000000000000000000000000000000000000000000001b000000000000000000000000000000000000000000000000000000000000001b0000000000000000000000000000000000000000000000000000000000000000").unwrap();
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let mut o = [255u8; 32];
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f.execute(&i_bad[..], &mut BytesRef::Fixed(&mut o[..]));
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assert_eq!(&o[..], &(FromHex::from_hex("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap())[..]);
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let i_bad = FromHex::from_hex("47173285a8d7341e5e972fc677286384f802f8ef42a5ec5f03bbfa254cb01fad000000000000000000000000000000000000000000000000000000000000001b0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001b").unwrap();
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let mut o = [255u8; 32];
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f.execute(&i_bad[..], &mut BytesRef::Fixed(&mut o[..]));
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assert_eq!(&o[..], &(FromHex::from_hex("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap())[..]);
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let i_bad = FromHex::from_hex("47173285a8d7341e5e972fc677286384f802f8ef42a5ec5f03bbfa254cb01fad000000000000000000000000000000000000000000000000000000000000001bffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff000000000000000000000000000000000000000000000000000000000000001b").unwrap();
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let mut o = [255u8; 32];
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f.execute(&i_bad[..], &mut BytesRef::Fixed(&mut o[..]));
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assert_eq!(&o[..], &(FromHex::from_hex("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap())[..]);
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let i_bad = FromHex::from_hex("47173285a8d7341e5e972fc677286384f802f8ef42a5ec5f03bbfa254cb01fad000000000000000000000000000000000000000000000000000000000000001b000000000000000000000000000000000000000000000000000000000000001bffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap();
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let mut o = [255u8; 32];
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f.execute(&i_bad[..], &mut BytesRef::Fixed(&mut o[..]));
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assert_eq!(&o[..], &(FromHex::from_hex("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap())[..]);
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// TODO: Should this (corrupted version of the above) fail rather than returning some address?
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/* let i_bad = FromHex::from_hex("48173285a8d7341e5e972fc677286384f802f8ef42a5ec5f03bbfa254cb01fad000000000000000000000000000000000000000000000000000000000000001b650acf9d3f5f0a2c799776a1254355d5f4061762a237396a99a0e0e3fc2bcd6729514a0dacb2e623ac4abd157cb18163ff942280db4d5caad66ddf941ba12e03").unwrap();
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let mut o = [255u8; 32];
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f.execute(&i_bad[..], &mut BytesRef::Fixed(&mut o[..]));
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assert_eq!(&o[..], &(FromHex::from_hex("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap())[..]);*/
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}
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#[test]
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#[should_panic]
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fn from_unknown_linear() {
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let _ = ethereum_builtin("foo");
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}
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#[test]
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fn from_named_linear() {
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let pricer = Box::new(Linear { base: 10, word: 20 });
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let b = Builtin {
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pricer: pricer as Box<Pricer>,
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native: ethereum_builtin("identity"),
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};
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assert_eq!(b.cost(0), U256::from(10));
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assert_eq!(b.cost(1), U256::from(30));
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assert_eq!(b.cost(32), U256::from(30));
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assert_eq!(b.cost(33), U256::from(50));
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let i = [0u8, 1, 2, 3];
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let mut o = [255u8; 4];
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b.execute(&i[..], &mut BytesRef::Fixed(&mut o[..]));
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assert_eq!(i, o);
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}
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#[test]
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fn from_json() {
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let b = Builtin::from(ethjson::spec::Builtin {
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name: "identity".to_owned(),
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pricing: ethjson::spec::Pricing::Linear(ethjson::spec::Linear {
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base: 10,
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word: 20,
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})
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});
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assert_eq!(b.cost(0), U256::from(10));
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assert_eq!(b.cost(1), U256::from(30));
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assert_eq!(b.cost(32), U256::from(30));
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assert_eq!(b.cost(33), U256::from(50));
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let i = [0u8, 1, 2, 3];
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let mut o = [255u8; 4];
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b.execute(&i[..], &mut BytesRef::Fixed(&mut o[..]));
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assert_eq!(i, o);
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}
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}
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