292 lines
11 KiB
Rust
292 lines
11 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 util::*;
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use crypto::sha2::Sha256;
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use crypto::ripemd160::Ripemd160;
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use crypto::digest::Digest;
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/// Definition of a contract whose implementation is built-in.
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pub struct Builtin {
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/// The gas cost of running this built-in for the given size of input data.
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pub cost: Box<Fn(usize) -> U256>, // TODO: U256 should be bignum.
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/// Run this built-in function with the input being the first argument and the output
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/// being placed into the second.
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pub execute: Box<Fn(&[u8], &mut [u8])>,
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}
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// Rust does not mark closurer that do not capture as Sync
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// We promise that all builtins are thread safe since they only operate on given input.
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unsafe impl Sync for Builtin {}
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unsafe impl Send for Builtin {}
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impl fmt::Debug for Builtin {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "<Builtin>")
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}
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}
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impl Builtin {
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/// Create a new object from components.
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pub fn new(cost: Box<Fn(usize) -> U256>, execute: Box<Fn(&[u8], &mut [u8])>) -> Builtin {
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Builtin {cost: cost, execute: execute}
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}
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/// Create a new object from a builtin-function name with a linear cost associated with input size.
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pub fn from_named_linear(name: &str, base_cost: usize, word_cost: usize) -> Option<Builtin> {
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new_builtin_exec(name).map(|b| {
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let cost = Box::new(move|s: usize| -> U256 {
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U256::from(base_cost) + U256::from(word_cost) * U256::from((s + 31) / 32)
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});
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Self::new(cost, b)
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})
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}
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/// Simple forwarder for cost.
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pub fn cost(&self, s: usize) -> U256 { (*self.cost)(s) }
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/// Simple forwarder for execute.
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pub fn execute(&self, input: &[u8], output: &mut[u8]) { (*self.execute)(input, output); }
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/// Create a builtin from JSON.
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///
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/// JSON must be of the form `{ "name": "identity", "pricing": {"base": 10, "word": 20} }`.
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pub fn from_json(json: &Json) -> Option<Builtin> {
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// NICE: figure out a more convenient means of handing errors here.
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if let Json::String(ref name) = json["name"] {
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if let Json::Object(ref o) = json["pricing"] {
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if let Json::Object(ref o) = o["linear"] {
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if let Json::U64(ref word) = o["word"] {
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if let Json::U64(ref base) = o["base"] {
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return Self::from_named_linear(&name[..], *base as usize, *word as usize);
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}
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}
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}
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}
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}
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None
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}
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}
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/// Copy a bunch of bytes to a destination; if the `src` is too small to fill `dest`,
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/// leave the rest unchanged.
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pub fn copy_to(src: &[u8], dest: &mut[u8]) {
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// NICE: optimise
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for i in 0..min(src.len(), dest.len()) {
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dest[i] = src[i];
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}
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}
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/// Create a new builtin executor according to `name`.
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/// TODO: turn in to a factory with dynamic registration.
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pub fn new_builtin_exec(name: &str) -> Option<Box<Fn(&[u8], &mut [u8])>> {
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match name {
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"identity" => Some(Box::new(move|input: &[u8], output: &mut[u8]| {
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for i in 0..min(input.len(), output.len()) {
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output[i] = input[i];
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}
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})),
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"ecrecover" => Some(Box::new(move|input: &[u8], output: &mut[u8]| {
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#[repr(packed)]
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#[derive(Debug)]
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struct InType {
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hash: H256,
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v: H256,
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r: H256,
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s: H256,
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}
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let mut it: InType = InType { hash: H256::new(), v: H256::new(), r: H256::new(), s: H256::new() };
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it.copy_raw(input);
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if it.v == H256::from(&U256::from(27)) || it.v == H256::from(&U256::from(28)) {
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let s = Signature::from_rsv(&it.r, &it.s, it.v[31] - 27);
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if ec::is_valid(&s) {
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if let Ok(p) = ec::recover(&s, &it.hash) {
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let r = p.as_slice().sha3();
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// NICE: optimise and separate out into populate-like function
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for i in 0..min(32, output.len()) {
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output[i] = if i < 12 {0} else {r[i]};
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}
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}
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}
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}
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})),
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"sha256" => Some(Box::new(move|input: &[u8], output: &mut[u8]| {
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let mut sha = Sha256::new();
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sha.input(input);
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if output.len() >= 32 {
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sha.result(output);
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} else {
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let mut ret = H256::new();
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sha.result(ret.as_slice_mut());
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copy_to(&ret, output);
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}
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})),
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"ripemd160" => Some(Box::new(move|input: &[u8], output: &mut[u8]| {
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let mut sha = Ripemd160::new();
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sha.input(input);
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let mut ret = H256::new();
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sha.result(&mut ret.as_slice_mut()[12..32]);
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copy_to(&ret, output);
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})),
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_ => None
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}
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}
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#[test]
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fn identity() {
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let f = new_builtin_exec("identity").unwrap();
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let i = [0u8, 1, 2, 3];
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let mut o2 = [255u8; 2];
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f(&i[..], &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(&i[..], &mut o4[..]);
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assert_eq!(i, o4);
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let mut o8 = [255u8; 8];
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f(&i[..], &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 = new_builtin_exec("sha256").unwrap();
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let i = [0u8; 0];
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let mut o = [255u8; 32];
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f(&i[..], &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(&i[..], &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(&i[..], &mut o34[..]);
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assert_eq!(&o34[..], &(FromHex::from_hex("e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855ffff").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 = new_builtin_exec("ripemd160").unwrap();
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let i = [0u8; 0];
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let mut o = [255u8; 32];
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f(&i[..], &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(&i[..], &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(&i[..], &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 = new_builtin_exec("ecrecover").unwrap();
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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(&i[..], &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(&i[..], &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(&i[..], &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(&i_bad[..], &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(&i_bad[..], &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(&i_bad[..], &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(&i_bad[..], &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(&i_bad[..], &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(&i_bad[..], &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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fn from_named_linear() {
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let b = Builtin::from_named_linear("identity", 10, 20).unwrap();
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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 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 text = r#"{"name": "identity", "pricing": {"linear": {"base": 10, "word": 20}}}"#;
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let json = Json::from_str(text).unwrap();
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let b = Builtin::from_json(&json).unwrap();
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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 o[..]);
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assert_eq!(i, o);
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}
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