Separate precompiles to individual crates (#242)

Cargo.toml

@@ -2,6 +2,11 @@
 members = [
 	"frame/ethereum",
 	"frame/evm",
+	"frame/evm/precompile/simple",
+	"frame/evm/precompile/modexp",
+	"frame/evm/precompile/ed25519",
+	"frame/evm/precompile/bn128",
+	"frame/evm/precompile/blake2",
 	"client/consensus",
 	"client/rpc-core",
 	"client/rpc",

frame/evm/Cargo.toml

@@ -30,21 +30,9 @@ evm = { version = "0.19.0", default-features = false, features = ["with-codec"]
 evm-runtime = { version = "0.19.0", default-features = false }
 evm-gasometer = { version = "0.19.0", default-features = false }
 sha3 = { version = "0.8", default-features = false }
-impl-trait-for-tuples = "0.1"
-ripemd160 = { version = "0.9", default-features = false }
-
-num = { version = "0.3", features = ["alloc"], default-features = false, optional = true }
-ethereum-types = { version = "0.9.2", default-features = false, optional = true }
-bn = { package = "substrate-bn", version = "0.5", default-features = false, optional = true }
-ed25519-dalek = { version = "1.0.0", features = ["alloc", "u64_backend"], default-features = false, optional = true }
-
 
 [features]
-default = ["std", "modexp", "ed25519", "bn128", "blake2f"]
-blake2f = []
-modexp = ["num"]
-ed25519 = ["ed25519-dalek"]
-bn128 = ["bn", "ethereum-types"]
+default = ["std"]
 std = [
 	"serde",
 	"codec/std",
@@ -64,5 +52,4 @@ std = [
 	"evm-runtime/std",
 	"evm-gasometer/std",
 	"pallet-timestamp/std",
-	"ripemd160/std",
 ]

frame/evm/precompile/blake2/Cargo.toml

@@ -0,0 +1,24 @@
+[package]
+name = "pallet-evm-precompile-blake2"
+version = "2.0.0"
+authors = ["Parity Technologies <[email protected]>"]
+edition = "2018"
+license = "Apache-2.0"
+homepage = "https://substrate.dev"
+repository = "https://github.com/paritytech/substrate/"
+description = "BLAKE2 precompiles for EVM pallet."
+
+[dependencies]
+sp-core = { version = "2.0.0", default-features = false, git = "https://github.com/paritytech/substrate.git", branch = "frontier" }
+sp-io = { version = "2.0.0", default-features = false, git = "https://github.com/paritytech/substrate.git", branch = "frontier" }
+fp-evm = { version = "0.8.0", default-features = false, path = "../../../../primitives/evm" }
+evm = { version = "0.19.0", default-features = false, features = ["with-codec"] }
+
+[features]
+default = ["std"]
+std = [
+	"sp-core/std",
+	"sp-io/std",
+	"fp-evm/std",
+	"evm/std",
+]

frame/evm/src/eip_152.rs → frame/evm/precompile/blake2/src/eip_152.rs

@@ -1,3 +1,20 @@
+// 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.
+
 /// 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.

frame/evm/precompile/blake2/src/lib.rs

@@ -0,0 +1,95 @@
+// 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;
+
+mod eip_152;
+
+use alloc::vec::Vec;
+use core::mem::size_of;
+use fp_evm::LinearCostPrecompile;
+use evm::{ExitSucceed, ExitError};
+
+pub struct Blake2F;
+
+impl LinearCostPrecompile for Blake2F {
+	const BASE: usize = 15;
+	const WORD: usize = 3;
+
+	/// Format of `input`:
+	/// [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]
+	fn execute(
+		input: &[u8],
+		_: usize,
+	) -> core::result::Result<(ExitSucceed, Vec<u8>), ExitError> {
+		const BLAKE2_F_ARG_LEN: usize = 213;
+
+		if input.len() != BLAKE2_F_ARG_LEN {
+			return Err(ExitError::Other("input length for Blake2 F precompile should be exactly 213 bytes".into()));
+		}
+
+		let mut rounds_buf: [u8; 4] = [0; 4];
+		rounds_buf.copy_from_slice(&input[0..4]);
+		let rounds: u32 = u32::from_le_bytes(rounds_buf);
+
+		let mut h_buf: [u8; 64] = [0; 64];
+		h_buf.copy_from_slice(&input[4..48]);
+		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).into();
+			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).into();
+			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(ExitError::Other("incorrect final block indicator flag".into()))
+		};
+
+		crate::eip_152::compress(&mut h, m, [t_0.into(), t_1.into()], f, rounds as usize);
+
+		let mut output_buf = [0u8; 8 * size_of::<u64>()];
+		for (i, state_word) in h.iter().enumerate() {
+			output_buf[i * 8..(i + 1) * 8].copy_from_slice(&state_word.to_le_bytes());
+		}
+
+		Ok((ExitSucceed::Returned, output_buf.to_vec()))
+	}
+}

frame/evm/precompile/bn128/Cargo.toml

@@ -0,0 +1,25 @@
+[package]
+name = "pallet-evm-precompile-bn128"
+version = "2.0.0"
+authors = ["Parity Technologies <[email protected]>"]
+edition = "2018"
+license = "Apache-2.0"
+homepage = "https://substrate.dev"
+repository = "https://github.com/paritytech/substrate/"
+description = "BN128 precompiles for EVM pallet."
+
+[dependencies]
+sp-core = { version = "2.0.0", default-features = false, git = "https://github.com/paritytech/substrate.git", branch = "frontier" }
+sp-io = { version = "2.0.0", default-features = false, git = "https://github.com/paritytech/substrate.git", branch = "frontier" }
+fp-evm = { version = "0.8.0", default-features = false, path = "../../../../primitives/evm" }
+evm = { version = "0.19.0", default-features = false, features = ["with-codec"] }
+bn = { package = "substrate-bn", version = "0.5", default-features = false }
+
+[features]
+default = ["std"]
+std = [
+	"sp-core/std",
+	"sp-io/std",
+	"fp-evm/std",
+	"evm/std",
+]