mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
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Bastian Köcher
79f600db70
* Revert "Remove k256 crate from frame-support dependencies (#14452)"
This reverts commit 4d426214af.
* Keep the test
66 lines
2.0 KiB
Rust
66 lines
2.0 KiB
Rust
// This file is part of Substrate.
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// Copyright (C) Parity Technologies (UK) Ltd.
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// SPDX-License-Identifier: Apache-2.0
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//! Simple ECDSA secp256k1 API.
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//!
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//! Provides an extension trait for [`sp_core::ecdsa::Public`] to do certain operations.
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use sp_core::{crypto::ByteArray, ecdsa::Public};
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/// Extension trait for [`Public`] to be used from inside the runtime.
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///
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/// # Note
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///
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/// This is needed because host functions cannot be called from within
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/// `sp_core` due to cyclic dependencies on `sp_io`.
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pub trait ECDSAExt {
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/// Returns Ethereum address calculated from this ECDSA public key.
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fn to_eth_address(&self) -> Result<[u8; 20], ()>;
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}
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impl ECDSAExt for Public {
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fn to_eth_address(&self) -> Result<[u8; 20], ()> {
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use k256::{elliptic_curve::sec1::ToEncodedPoint, PublicKey};
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PublicKey::from_sec1_bytes(self.as_slice()).map_err(drop).and_then(|pub_key| {
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// uncompress the key
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let uncompressed = pub_key.to_encoded_point(false);
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// convert to ETH address
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<[u8; 20]>::try_from(
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sp_io::hashing::keccak_256(&uncompressed.as_bytes()[1..])[12..].as_ref(),
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)
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.map_err(drop)
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})
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}
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}
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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};
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#[test]
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fn to_eth_address_works() {
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let pair = ecdsa::Pair::from_string("//Alice//password", None).unwrap();
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let eth_address = pair.public().to_eth_address().unwrap();
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assert_eq!(
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array_bytes::bytes2hex("0x", ð_address),
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"0xdc1cce4263956850a3c8eb349dc6fc3f7792cb27"
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);
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}
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}
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