pallet-revive 0.7.2

// This file is part of Substrate.

// Copyright (C) Parity Technologies (UK) Ltd.
// SPDX-License-Identifier: Apache-2.0

// 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.

use crate::{
	precompiles::{BuiltinAddressMatcher, Error, Ext, PrimitivePrecompile},
	wasm::RuntimeCosts,
	Config,
};
use alloc::vec::Vec;
use core::{marker::PhantomData, num::NonZero};
use sp_runtime::DispatchError;

pub struct Blake2F<T>(PhantomData<T>);

impl<T: Config> PrimitivePrecompile for Blake2F<T> {
	type T = T;
	const MATCHER: BuiltinAddressMatcher = BuiltinAddressMatcher::Fixed(NonZero::new(9).unwrap());
	const HAS_CONTRACT_INFO: bool = false;

	fn call(
		_address: &[u8; 20],
		input: Vec<u8>,
		env: &mut impl Ext<T = Self::T>,
	) -> Result<Vec<u8>, Error> {
		const BLAKE2_F_ARG_LEN: usize = 213;

		if input.len() != BLAKE2_F_ARG_LEN {
			Err(DispatchError::from("invalid input length"))?;
		}

		let mut rounds_buf: [u8; 4] = [0; 4];
		rounds_buf.copy_from_slice(&input[0..4]);
		let rounds: u32 = u32::from_be_bytes(rounds_buf);

		env.gas_meter_mut().charge(RuntimeCosts::Blake2F(rounds))?;

		// we use from_le_bytes below to effectively swap byte order to LE if architecture is BE

		let mut h_buf: [u8; 64] = [0; 64];
		h_buf.copy_from_slice(&input[4..68]);
		let mut h = [0u64; 8];
		let mut ctr = 0;
		for state_word in &mut h {
			let mut temp: [u8; 8] = Default::default();
			temp.copy_from_slice(&h_buf[(ctr * 8)..(ctr + 1) * 8]);
			*state_word = u64::from_le_bytes(temp);
			ctr += 1;
		}

		let mut m_buf: [u8; 128] = [0; 128];
		m_buf.copy_from_slice(&input[68..196]);
		let mut m = [0u64; 16];
		ctr = 0;
		for msg_word in &mut m {
			let mut temp: [u8; 8] = Default::default();
			temp.copy_from_slice(&m_buf[(ctr * 8)..(ctr + 1) * 8]);
			*msg_word = u64::from_le_bytes(temp);
			ctr += 1;
		}

		let mut t_0_buf: [u8; 8] = [0; 8];
		t_0_buf.copy_from_slice(&input[196..204]);
		let t_0 = u64::from_le_bytes(t_0_buf);

		let mut t_1_buf: [u8; 8] = [0; 8];
		t_1_buf.copy_from_slice(&input[204..212]);
		let t_1 = u64::from_le_bytes(t_1_buf);

		let f = if input[212] == 1 {
			true
		} else if input[212] == 0 {
			false
		} else {
			return Err(DispatchError::from("invalid final flag").into());
		};

		eip_152::compress(&mut h, m, [t_0, t_1], f, rounds as usize);

		let mut output_buf = [0u8; u64::BITS as usize];
		for (i, state_word) in h.iter().enumerate() {
			output_buf[i * 8..(i + 1) * 8].copy_from_slice(&state_word.to_le_bytes());
		}

		Ok(output_buf.to_vec())
	}
}

mod eip_152 {
	/// The precomputed values for BLAKE2b [from the spec](https://tools.ietf.org/html/rfc7693#section-2.7)
	/// There are 10 16-byte arrays - one for each round
	/// the entries are calculated from the sigma constants.
	const SIGMA: [[usize; 16]; 10] = [
		[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15],
		[14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3],
		[11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4],
		[7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8],
		[9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13],
		[2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9],
		[12, 5, 1, 15, 14, 13, 4, 10, 0, 7, 6, 3, 9, 2, 8, 11],
		[13, 11, 7, 14, 12, 1, 3, 9, 5, 0, 15, 4, 8, 6, 2, 10],
		[6, 15, 14, 9, 11, 3, 0, 8, 12, 2, 13, 7, 1, 4, 10, 5],
		[10, 2, 8, 4, 7, 6, 1, 5, 15, 11, 9, 14, 3, 12, 13, 0],
	];

	/// IV is the initialization vector for BLAKE2b. See https://tools.ietf.org/html/rfc7693#section-2.6
	/// for details.
	const IV: [u64; 8] = [
		0x6a09e667f3bcc908,
		0xbb67ae8584caa73b,
		0x3c6ef372fe94f82b,
		0xa54ff53a5f1d36f1,
		0x510e527fade682d1,
		0x9b05688c2b3e6c1f,
		0x1f83d9abfb41bd6b,
		0x5be0cd19137e2179,
	];

	#[inline(always)]
	/// The G mixing function. See https://tools.ietf.org/html/rfc7693#section-3.1
	fn g(v: &mut [u64], a: usize, b: usize, c: usize, d: usize, x: u64, y: u64) {
		v[a] = v[a].wrapping_add(v[b]).wrapping_add(x);
		v[d] = (v[d] ^ v[a]).rotate_right(32);
		v[c] = v[c].wrapping_add(v[d]);
		v[b] = (v[b] ^ v[c]).rotate_right(24);
		v[a] = v[a].wrapping_add(v[b]).wrapping_add(y);
		v[d] = (v[d] ^ v[a]).rotate_right(16);
		v[c] = v[c].wrapping_add(v[d]);
		v[b] = (v[b] ^ v[c]).rotate_right(63);
	}

	/// The Blake2 compression function F. See https://tools.ietf.org/html/rfc7693#section-3.2
	/// Takes as an argument the state vector `h`, message block vector `m`, offset counter `t`,
	/// final block indicator flag `f`, and number of rounds `rounds`. The state vector provided as
	/// the first parameter is modified by the function.
	pub fn compress(h: &mut [u64; 8], m: [u64; 16], t: [u64; 2], f: bool, rounds: usize) {
		let mut v = [0u64; 16];
		v[..h.len()].copy_from_slice(h); // First half from state.
		v[h.len()..].copy_from_slice(&IV); // Second half from IV.

		v[12] ^= t[0];
		v[13] ^= t[1];

		if f {
			v[14] = !v[14] // Invert all bits if the last-block-flag is set.
		}
		for i in 0..rounds {
			// Message word selection permutation for this round.
			let s = &SIGMA[i % 10];
			g(&mut v, 0, 4, 8, 12, m[s[0]], m[s[1]]);
			g(&mut v, 1, 5, 9, 13, m[s[2]], m[s[3]]);
			g(&mut v, 2, 6, 10, 14, m[s[4]], m[s[5]]);
			g(&mut v, 3, 7, 11, 15, m[s[6]], m[s[7]]);

			g(&mut v, 0, 5, 10, 15, m[s[8]], m[s[9]]);
			g(&mut v, 1, 6, 11, 12, m[s[10]], m[s[11]]);
			g(&mut v, 2, 7, 8, 13, m[s[12]], m[s[13]]);
			g(&mut v, 3, 4, 9, 14, m[s[14]], m[s[15]]);
		}

		for i in 0..8 {
			h[i] ^= v[i] ^ v[i + 8];
		}
	}
}

#[cfg(test)]
mod tests {
	use super::*;
	use crate::{
		precompiles::tests::{run_failure_test_vectors, run_test_vectors},
		tests::Test,
	};

	#[test]
	fn test_blake2f() {
		run_test_vectors::<Blake2F<Test>>(include_str!("./testdata/9-blake2f.json"));
		run_failure_test_vectors::<Blake2F<Test>>(include_str!(
			"./testdata/9-blake2f-failures.json"
		));
	}
}