Grcov report - lib.rs

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// Copyright 2019-2025 PureStake Inc.

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// This file is part of Moonbeam.

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// Moonbeam 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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// Moonbeam 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 Moonbeam.  If not, see <http://www.gnu.org/licenses/>.

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//! The Ethereum Signature implementation.

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//!

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//! It includes the Verify and IdentifyAccount traits for the AccountId20

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

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use parity_scale_codec::{Decode, Encode, MaxEncodedLen};

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use scale_info::TypeInfo;

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use sha3::{Digest, Keccak256};

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use sp_core::{ecdsa, H160};

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pub use serde::{de::DeserializeOwned, Deserialize, Serialize};

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//TODO Maybe this should be upstreamed into Frontier (And renamed accordingly) so that it can

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// be used in palletEVM as well. It may also need more traits such as AsRef, AsMut, etc like

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// AccountId32 has.

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/// System account size in bytes = Pallet_Name_Hash (16) + Storage_name_hash (16) +

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/// Blake2_128Concat (16) + AccountId (20) + AccountInfo (4 + 12 + AccountData (4* 16)) = 148

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pub const SYSTEM_ACCOUNT_SIZE: u64 = 148;

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/// The account type to be used in Moonbeam. It is a wrapper for 20 fixed bytes. We prefer to use

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/// a dedicated type to prevent using arbitrary 20 byte arrays were AccountIds are expected. With

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/// the introduction of the `scale-info` crate this benefit extends even to non-Rust tools like

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/// Polkadot JS.

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#[derive(

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	Eq, PartialEq, Copy, Clone, Encode, Decode, TypeInfo, MaxEncodedLen, Default, PartialOrd, Ord,

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)]

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pub struct AccountId20(pub [u8; 20]);

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impl_serde::impl_fixed_hash_serde!(AccountId20, 20);

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#[cfg(feature = "std")]

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impl std::fmt::Display for AccountId20 {

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	//TODO This is a pretty quck-n-dirty implementation. Perhaps we should add

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	// checksum casing here? I bet there is a crate for that.

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	// Maybe this one https://github.com/miguelmota/rust-eth-checksum

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	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {

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		write!(f, "{:?}", self.0)

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impl core::fmt::Debug for AccountId20 {

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	fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {

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		write!(f, "{:?}", H160(self.0))

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impl From<[u8; 20]> for AccountId20 {

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3679042

	fn from(bytes: [u8; 20]) -> Self {

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3679042

		Self(bytes)

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3679042

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impl From<AccountId20> for [u8; 20] {

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	fn from(value: AccountId20) -> Self {

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		value.0

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2768

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// NOTE: the implementation is lossy, and is intended to be used

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// only to convert from Polkadot accounts to AccountId20.

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// See https://github.com/moonbeam-foundation/moonbeam/pull/2315#discussion_r1205830577

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// DO NOT USE IT FOR ANYTHING ELSE.

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impl From<[u8; 32]> for AccountId20 {

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	fn from(bytes: [u8; 32]) -> Self {

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		let mut buffer = [0u8; 20];

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		buffer.copy_from_slice(&bytes[..20]);

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		Self(buffer)

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impl From<sp_runtime::AccountId32> for AccountId20 {

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	fn from(account: sp_runtime::AccountId32) -> Self {

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		let bytes: &[u8; 32] = account.as_ref();

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		Self::from(*bytes)

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impl From<H160> for AccountId20 {

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48730

	fn from(h160: H160) -> Self {

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		Self(h160.0)

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48730

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impl From<AccountId20> for H160 {

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	fn from(value: AccountId20) -> Self {

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		H160(value.0)

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4892870

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#[cfg(feature = "std")]

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impl std::str::FromStr for AccountId20 {

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	type Err = &'static str;

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	fn from_str(input: &str) -> Result<Self, Self::Err> {

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		H160::from_str(input)

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			.map(Into::into)

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			.map_err(|_| "invalid hex address.")

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#[derive(

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	Eq, PartialEq, Clone, Encode, Decode, sp_core::RuntimeDebug, TypeInfo, Serialize, Deserialize,

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)]

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pub struct EthereumSignature(ecdsa::Signature);

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impl From<ecdsa::Signature> for EthereumSignature {

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	fn from(x: ecdsa::Signature) -> Self {

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		EthereumSignature(x)

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impl From<sp_runtime::MultiSignature> for EthereumSignature {

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	fn from(signature: sp_runtime::MultiSignature) -> Self {

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		match signature {

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			sp_runtime::MultiSignature::Ed25519(_) => {

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				panic!("Ed25519 not supported for EthereumSignature")

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			sp_runtime::MultiSignature::Sr25519(_) => {

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				panic!("Sr25519 not supported for EthereumSignature")

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			sp_runtime::MultiSignature::Ecdsa(sig) => Self(sig),

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impl sp_runtime::traits::Verify for EthereumSignature {

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	type Signer = EthereumSigner;

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	fn verify<L: sp_runtime::traits::Lazy<[u8]>>(&self, mut msg: L, signer: &AccountId20) -> bool {

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		let mut m = [0u8; 32];

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		m.copy_from_slice(Keccak256::digest(msg.get()).as_slice());

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		match sp_io::crypto::secp256k1_ecdsa_recover(self.0.as_ref(), &m) {

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			Ok(pubkey) => {

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				AccountId20(H160::from_slice(&Keccak256::digest(pubkey).as_slice()[12..32]).0)

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					== *signer

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			Err(sp_io::EcdsaVerifyError::BadRS) => {

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				log::error!(target: "evm", "Error recovering: Incorrect value of R or S");

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				false

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			Err(sp_io::EcdsaVerifyError::BadV) => {

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				log::error!(target: "evm", "Error recovering: Incorrect value of V");

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				false

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			Err(sp_io::EcdsaVerifyError::BadSignature) => {

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				log::error!(target: "evm", "Error recovering: Invalid signature");

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				false

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/// Public key for an Ethereum / Moonbeam compatible account

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#[derive(

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	Eq, PartialEq, Ord, PartialOrd, Clone, Encode, Decode, sp_core::RuntimeDebug, TypeInfo,

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)]

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#[cfg_attr(feature = "std", derive(serde::Serialize, serde::Deserialize))]

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pub struct EthereumSigner([u8; 20]);

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impl sp_runtime::traits::IdentifyAccount for EthereumSigner {

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	type AccountId = AccountId20;

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	fn into_account(self) -> AccountId20 {

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		AccountId20(self.0)

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impl From<[u8; 20]> for EthereumSigner {

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	fn from(x: [u8; 20]) -> Self {

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		EthereumSigner(x)

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impl From<ecdsa::Public> for EthereumSigner {

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	fn from(x: ecdsa::Public) -> Self {

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		let decompressed = libsecp256k1::PublicKey::parse_slice(

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			&x.0,

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			Some(libsecp256k1::PublicKeyFormat::Compressed),

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		.expect("Wrong compressed public key provided")

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		.serialize();

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		let mut m = [0u8; 64];

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		m.copy_from_slice(&decompressed[1..65]);

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		let account = H160::from_slice(&Keccak256::digest(m).as_slice()[12..32]);

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		EthereumSigner(account.into())

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impl From<libsecp256k1::PublicKey> for EthereumSigner {

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	fn from(x: libsecp256k1::PublicKey) -> Self {

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		let mut m = [0u8; 64];

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		m.copy_from_slice(&x.serialize()[1..65]);

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		let account = H160::from_slice(&Keccak256::digest(m).as_slice()[12..32]);

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		EthereumSigner(account.into())

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#[cfg(feature = "std")]

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impl std::fmt::Display for EthereumSigner {

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	fn fmt(&self, fmt: &mut std::fmt::Formatter) -> std::fmt::Result {

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		write!(fmt, "ethereum signature: {:?}", H160::from_slice(&self.0))

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#[cfg(test)]

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mod tests {

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	use super::*;

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	use sp_core::{ecdsa, Pair, H256};

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	use sp_runtime::traits::IdentifyAccount;

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	#[test]

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	fn test_account_derivation_1() {

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		// Test from https://asecuritysite.com/encryption/ethadd

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		let secret_key =

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			hex::decode("502f97299c472b88754accd412b7c9a6062ef3186fba0c0388365e1edec24875")

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				.unwrap();

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		let mut expected_hex_account = [0u8; 20];

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		hex::decode_to_slice(

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			"976f8456e4e2034179b284a23c0e0c8f6d3da50c",

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			&mut expected_hex_account,

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		.expect("example data is 20 bytes of valid hex");

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		let public_key = ecdsa::Pair::from_seed_slice(&secret_key).unwrap().public();

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		let account: EthereumSigner = public_key.into();

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		let expected_account = AccountId20::from(expected_hex_account);

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		assert_eq!(account.into_account(), expected_account);

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	#[test]

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	fn test_account_derivation_2() {

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		// Test from https://asecuritysite.com/encryption/ethadd

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		let secret_key =

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			hex::decode("0f02ba4d7f83e59eaa32eae9c3c4d99b68ce76decade21cdab7ecce8f4aef81a")

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				.unwrap();

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		let mut expected_hex_account = [0u8; 20];

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		hex::decode_to_slice(

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			"420e9f260b40af7e49440cead3069f8e82a5230f",

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			&mut expected_hex_account,

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		.expect("example data is 20 bytes of valid hex");

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		let public_key = ecdsa::Pair::from_seed_slice(&secret_key).unwrap().public();

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		let account: EthereumSigner = public_key.into();

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		let expected_account = AccountId20::from(expected_hex_account);

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		assert_eq!(account.into_account(), expected_account);

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	#[test]

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	fn test_account_derivation_3() {

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		let m = hex::decode("c5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470")

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			.unwrap();

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		let old = AccountId20(H160::from(H256::from_slice(Keccak256::digest(&m).as_slice())).0);

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		let new = AccountId20(H160::from_slice(&Keccak256::digest(&m).as_slice()[12..32]).0);

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		assert_eq!(new, old);

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1

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