1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135

// SPDX-License-Identifier: Apache-2.0
// This file is part of Frontier.
//
// Copyright (c) 2020 Parity Technologies (UK) Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// 	http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#![cfg_attr(not(feature = "std"), no_std)]

extern crate alloc;

use alloc::vec::Vec;
use core::cmp::min;
use fp_evm::LinearCostPrecompile;
use evm::{ExitSucceed, ExitError};

/// The identity precompile.
pub struct Identity;

impl LinearCostPrecompile for Identity {
	const BASE: u64 = 15;
	const WORD: u64 = 3;

	fn execute(
		input: &[u8],
		_: u64,
	) -> core::result::Result<(ExitSucceed, Vec<u8>), ExitError> {
		Ok((ExitSucceed::Returned, input.to_vec()))
	}
}

/// The ecrecover precompile.
pub struct ECRecover;

impl LinearCostPrecompile for ECRecover {
	const BASE: u64 = 3000;
	const WORD: u64 = 0;

	fn execute(
		i: &[u8],
		_: u64,
	) -> core::result::Result<(ExitSucceed, Vec<u8>), ExitError> {
		let mut input = [0u8; 128];
		input[..min(i.len(), 128)].copy_from_slice(&i[..min(i.len(), 128)]);

		let mut msg = [0u8; 32];
		let mut sig = [0u8; 65];

		msg[0..32].copy_from_slice(&input[0..32]);
		sig[0..32].copy_from_slice(&input[64..96]);
		sig[32..64].copy_from_slice(&input[96..128]);
		sig[64] = input[63];

		let pubkey = sp_io::crypto::secp256k1_ecdsa_recover(&sig, &msg)
			.map_err(|_| ExitError::Other("Public key recover failed".into()))?;
		let mut address = sp_io::hashing::keccak_256(&pubkey);
		address[0..12].copy_from_slice(&[0u8; 12]);

		Ok((ExitSucceed::Returned, address.to_vec()))
	}
}

/// The ripemd precompile.
pub struct Ripemd160;

impl LinearCostPrecompile for Ripemd160 {
	const BASE: u64 = 600;
	const WORD: u64 = 120;

	fn execute(
		input: &[u8],
		_cost: u64,
	) -> core::result::Result<(ExitSucceed, Vec<u8>), ExitError> {
		use ripemd160::Digest;

		let mut ret = [0u8; 32];
		ret[12..32].copy_from_slice(&ripemd160::Ripemd160::digest(input));
		Ok((ExitSucceed::Returned, ret.to_vec()))
	}
}

/// The sha256 precompile.
pub struct Sha256;

impl LinearCostPrecompile for Sha256 {
	const BASE: u64 = 60;
	const WORD: u64 = 12;

	fn execute(
		input: &[u8],
		_cost: u64,
	) -> core::result::Result<(ExitSucceed, Vec<u8>), ExitError> {
		let ret = sp_io::hashing::sha2_256(input);
		Ok((ExitSucceed::Returned, ret.to_vec()))
	}
}

/// The ecrecover precompile.
pub struct ECRecoverPublicKey;

impl LinearCostPrecompile for ECRecoverPublicKey {
	const BASE: u64 = 3000;
	const WORD: u64 = 0;

	fn execute(
		i: &[u8],
		_: u64,
	) -> core::result::Result<(ExitSucceed, Vec<u8>), ExitError> {
		let mut input = [0u8; 128];
		input[..min(i.len(), 128)].copy_from_slice(&i[..min(i.len(), 128)]);

		let mut msg = [0u8; 32];
		let mut sig = [0u8; 65];

		msg[0..32].copy_from_slice(&input[0..32]);
		sig[0..32].copy_from_slice(&input[64..96]);
		sig[32..64].copy_from_slice(&input[96..128]);
		sig[64] = input[63];

		let pubkey = sp_io::crypto::secp256k1_ecdsa_recover(&sig, &msg)
			.map_err(|_| ExitError::Other("Public key recover failed".into()))?;

		Ok((ExitSucceed::Returned, pubkey.to_vec()))
	}
}