openethereum/ethcore/src/builtin.rs

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// Copyright 2015, 2016 Parity Technologies (UK) Ltd.
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// This file is part of Parity.
// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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use crypto::sha2::Sha256 as Sha256Digest;
use crypto::ripemd160::Ripemd160 as Ripemd160Digest;
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use crypto::digest::Digest;
use std::cmp::min;
use util::{U256, H256, Hashable, FixedHash, BytesRef};
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use ethkey::{Signature, recover as ec_recover};
use ethjson;
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/// Native implementation of a built-in contract.
pub trait Impl: Send + Sync {
/// execute this built-in on the given input, writing to the given output.
fn execute(&self, input: &[u8], output: &mut BytesRef);
}
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/// A gas pricing scheme for built-in contracts.
pub trait Pricer: Send + Sync {
/// The gas cost of running this built-in for the given size of input data.
fn cost(&self, in_size: usize) -> U256;
}
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/// A linear pricing model. This computes a price using a base cost and a cost per-word.
struct Linear {
base: usize,
word: usize,
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}
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impl Pricer for Linear {
fn cost(&self, in_size: usize) -> U256 {
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.
pub struct Builtin {
pricer: Box<Pricer>,
native: Box<Impl>,
}
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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.
pub fn execute(&self, input: &[u8], output: &mut BytesRef) { self.native.execute(input, output) }
}
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impl From<ethjson::spec::Builtin> for Builtin {
fn from(b: ethjson::spec::Builtin) -> Self {
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let pricer = match b.pricing {
ethjson::spec::Pricing::Linear(linear) => {
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Box::new(Linear {
base: linear.base,
word: linear.word,
})
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}
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};
Builtin {
pricer: pricer,
native: ethereum_builtin(&b.name),
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}
}
}
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// Ethereum builtin creator.
fn ethereum_builtin(name: &str) -> Box<Impl> {
match name {
"identity" => Box::new(Identity) as Box<Impl>,
"ecrecover" => Box::new(EcRecover) as Box<Impl>,
"sha256" => Box::new(Sha256) as Box<Impl>,
"ripemd160" => Box::new(Ripemd160) as Box<Impl>,
_ => panic!("invalid builtin name: {}", name),
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}
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}
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// Ethereum builtins:
//
// - The identity function
// - ec recovery
// - sha256
// - ripemd160
#[derive(Debug)]
struct Identity;
#[derive(Debug)]
struct EcRecover;
#[derive(Debug)]
struct Sha256;
#[derive(Debug)]
struct Ripemd160;
impl Impl for Identity {
fn execute(&self, input: &[u8], output: &mut BytesRef) {
output.write(0, input);
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}
}
impl Impl for EcRecover {
fn execute(&self, i: &[u8], output: &mut BytesRef) {
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let len = min(i.len(), 128);
let mut input = [0; 128];
input[..len].copy_from_slice(&i[..len]);
let hash = H256::from_slice(&input[0..32]);
let v = H256::from_slice(&input[32..64]);
let r = H256::from_slice(&input[64..96]);
let s = H256::from_slice(&input[96..128]);
let bit = match v[31] {
27 | 28 if &v.0[..31] == &[0; 31] => v[31] - 27,
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_ => return,
};
let s = Signature::from_rsv(&r, &s, bit);
if s.is_valid() {
if let Ok(p) = ec_recover(&s, &hash) {
let r = p.sha3();
output.write(0, &[0; 12]);
output.write(12, &r[12..r.len()]);
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}
}
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}
}
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impl Impl for Sha256 {
fn execute(&self, input: &[u8], output: &mut BytesRef) {
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let mut sha = Sha256Digest::new();
sha.input(input);
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let mut out = [0; 32];
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 {
fn execute(&self, input: &[u8], output: &mut BytesRef) {
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let mut sha = Ripemd160Digest::new();
sha.input(input);
let mut out = [0; 32];
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)]
mod tests {
use super::{Builtin, Linear, ethereum_builtin, Pricer};
use ethjson;
use util::{U256, BytesRef};
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#[test]
fn identity() {
let f = ethereum_builtin("identity");
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let i = [0u8, 1, 2, 3];
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let mut o2 = [255u8; 2];
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];
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];
f.execute(&i[..], &mut BytesRef::Fixed(&mut o8[..]));
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assert_eq!(i, o8[..4]);
assert_eq!([255u8; 4], o8[4..]);
}
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#[test]
fn sha256() {
use rustc_serialize::hex::FromHex;
let f = ethereum_builtin("sha256");
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let i = [0u8; 0];
let mut o = [255u8; 32];
f.execute(&i[..], &mut BytesRef::Fixed(&mut o[..]));
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assert_eq!(&o[..], &(FromHex::from_hex("e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855").unwrap())[..]);
let mut o8 = [255u8; 8];
f.execute(&i[..], &mut BytesRef::Fixed(&mut o8[..]));
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assert_eq!(&o8[..], &(FromHex::from_hex("e3b0c44298fc1c14").unwrap())[..]);
let mut o34 = [255u8; 34];
f.execute(&i[..], &mut BytesRef::Fixed(&mut o34[..]));
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assert_eq!(&o34[..], &(FromHex::from_hex("e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855ffff").unwrap())[..]);
let mut ov = vec![];
f.execute(&i[..], &mut BytesRef::Flexible(&mut ov));
assert_eq!(&ov[..], &(FromHex::from_hex("e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855").unwrap())[..]);
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}
#[test]
fn ripemd160() {
use rustc_serialize::hex::FromHex;
let f = ethereum_builtin("ripemd160");
let i = [0u8; 0];
let mut o = [255u8; 32];
f.execute(&i[..], &mut BytesRef::Fixed(&mut o[..]));
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assert_eq!(&o[..], &(FromHex::from_hex("0000000000000000000000009c1185a5c5e9fc54612808977ee8f548b2258d31").unwrap())[..]);
let mut o8 = [255u8; 8];
f.execute(&i[..], &mut BytesRef::Fixed(&mut o8[..]));
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assert_eq!(&o8[..], &(FromHex::from_hex("0000000000000000").unwrap())[..]);
let mut o34 = [255u8; 34];
f.execute(&i[..], &mut BytesRef::Fixed(&mut o34[..]));
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assert_eq!(&o34[..], &(FromHex::from_hex("0000000000000000000000009c1185a5c5e9fc54612808977ee8f548b2258d31ffff").unwrap())[..]);
}
#[test]
fn ecrecover() {
use rustc_serialize::hex::FromHex;
/*let k = KeyPair::from_secret(b"test".sha3()).unwrap();
let a: Address = From::from(k.public().sha3());
println!("Address: {}", a);
let m = b"hello world".sha3();
println!("Message: {}", m);
let s = k.sign(&m).unwrap();
println!("Signed: {}", s);*/
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[..]));
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assert_eq!(&o[..], &(FromHex::from_hex("000000000000000000000000c08b5542d177ac6686946920409741463a15dddb").unwrap())[..]);
let mut o8 = [255u8; 8];
f.execute(&i[..], &mut BytesRef::Fixed(&mut o8[..]));
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assert_eq!(&o8[..], &(FromHex::from_hex("0000000000000000").unwrap())[..]);
let mut o34 = [255u8; 34];
f.execute(&i[..], &mut BytesRef::Fixed(&mut o34[..]));
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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[..]));
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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[..]));
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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[..]));
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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[..]));
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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[..]));
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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[..]));
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assert_eq!(&o[..], &(FromHex::from_hex("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap())[..]);*/
}
#[test]
#[should_panic]
fn from_unknown_linear() {
let _ = ethereum_builtin("foo");
}
#[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"),
};
assert_eq!(b.cost(0), U256::from(10));
assert_eq!(b.cost(1), U256::from(30));
assert_eq!(b.cost(32), U256::from(30));
assert_eq!(b.cost(33), U256::from(50));
let i = [0u8, 1, 2, 3];
let mut o = [255u8; 4];
b.execute(&i[..], &mut BytesRef::Fixed(&mut o[..]));
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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,
})
});
assert_eq!(b.cost(0), U256::from(10));
assert_eq!(b.cost(1), U256::from(30));
assert_eq!(b.cost(32), U256::from(30));
assert_eq!(b.cost(33), U256::from(50));
let i = [0u8, 1, 2, 3];
let mut o = [255u8; 4];
b.execute(&i[..], &mut BytesRef::Fixed(&mut o[..]));
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assert_eq!(i, o);
}
}