pallet_evm_precompile_blake2/
lib.rs

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1// This file is part of Frontier.
2
3// Copyright (C) Parity Technologies (UK) Ltd.
4// SPDX-License-Identifier: Apache-2.0
5
6// Licensed under the Apache License, Version 2.0 (the "License");
7// you may not use this file except in compliance with the License.
8// You may obtain a copy of the License at
9//
10// 	http://www.apache.org/licenses/LICENSE-2.0
11//
12// Unless required by applicable law or agreed to in writing, software
13// distributed under the License is distributed on an "AS IS" BASIS,
14// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15// See the License for the specific language governing permissions and
16// limitations under the License.
17
18#![cfg_attr(not(feature = "std"), no_std)]
19#![warn(unused_crate_dependencies)]
20
21mod eip_152;
22
23use fp_evm::{
24	ExitError, ExitSucceed, Precompile, PrecompileFailure, PrecompileHandle, PrecompileOutput,
25	PrecompileResult,
26};
27
28pub struct Blake2F;
29
30impl Blake2F {
31	const GAS_COST_PER_ROUND: u64 = 1; // https://eips.ethereum.org/EIPS/eip-152#gas-costs-and-benchmarks
32}
33
34impl Precompile for Blake2F {
35	/// Format of `input`:
36	/// [4 bytes for rounds][64 bytes for h][128 bytes for m][8 bytes for t_0][8 bytes for t_1][1 byte for f]
37	fn execute(handle: &mut impl PrecompileHandle) -> PrecompileResult {
38		const BLAKE2_F_ARG_LEN: usize = 213;
39
40		let input = handle.input();
41
42		if input.len() != BLAKE2_F_ARG_LEN {
43			return Err(PrecompileFailure::Error {
44				exit_status: ExitError::Other(
45					"input length for Blake2 F precompile should be exactly 213 bytes".into(),
46				),
47			});
48		}
49
50		let mut rounds_buf: [u8; 4] = [0; 4];
51		rounds_buf.copy_from_slice(&input[0..4]);
52		let rounds: u32 = u32::from_be_bytes(rounds_buf);
53
54		let gas_cost: u64 = (rounds as u64) * Blake2F::GAS_COST_PER_ROUND;
55		handle.record_cost(gas_cost)?;
56
57		let input = handle.input();
58
59		// we use from_le_bytes below to effectively swap byte order to LE if architecture is BE
60
61		let mut h_buf: [u8; 64] = [0; 64];
62		h_buf.copy_from_slice(&input[4..68]);
63		let mut h = [0u64; 8];
64		let mut ctr = 0;
65		for state_word in &mut h {
66			let mut temp: [u8; 8] = Default::default();
67			temp.copy_from_slice(&h_buf[(ctr * 8)..(ctr + 1) * 8]);
68			*state_word = u64::from_le_bytes(temp);
69			ctr += 1;
70		}
71
72		let mut m_buf: [u8; 128] = [0; 128];
73		m_buf.copy_from_slice(&input[68..196]);
74		let mut m = [0u64; 16];
75		ctr = 0;
76		for msg_word in &mut m {
77			let mut temp: [u8; 8] = Default::default();
78			temp.copy_from_slice(&m_buf[(ctr * 8)..(ctr + 1) * 8]);
79			*msg_word = u64::from_le_bytes(temp);
80			ctr += 1;
81		}
82
83		let mut t_0_buf: [u8; 8] = [0; 8];
84		t_0_buf.copy_from_slice(&input[196..204]);
85		let t_0 = u64::from_le_bytes(t_0_buf);
86
87		let mut t_1_buf: [u8; 8] = [0; 8];
88		t_1_buf.copy_from_slice(&input[204..212]);
89		let t_1 = u64::from_le_bytes(t_1_buf);
90
91		let f = if input[212] == 1 {
92			true
93		} else if input[212] == 0 {
94			false
95		} else {
96			return Err(PrecompileFailure::Error {
97				exit_status: ExitError::Other("incorrect final block indicator flag".into()),
98			});
99		};
100
101		crate::eip_152::compress(&mut h, m, [t_0, t_1], f, rounds as usize);
102
103		let mut output_buf = [0u8; u64::BITS as usize];
104		for (i, state_word) in h.iter().enumerate() {
105			output_buf[i * 8..(i + 1) * 8].copy_from_slice(&state_word.to_le_bytes());
106		}
107
108		Ok(PrecompileOutput {
109			exit_status: ExitSucceed::Returned,
110			output: output_buf.to_vec(),
111		})
112	}
113}
114
115#[cfg(test)]
116mod tests {
117	use super::*;
118	use pallet_evm_test_vector_support::test_precompile_test_vectors;
119
120	#[test]
121	fn process_consensus_tests() -> Result<(), String> {
122		test_precompile_test_vectors::<Blake2F>("../testdata/blake2F.json")?;
123		Ok(())
124	}
125}
pallet_evm_precompile_blake2/lib.rs

pallet_evm_precompile_blake2/
lib.rs
