62 lines
2.1 KiB
Rust
62 lines
2.1 KiB
Rust
// Copyright 2015-2018 Parity Technologies (UK) Ltd.
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// This file is part of Parity.
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// Parity 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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// Parity 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 Parity. If not, see <http://www.gnu.org/licenses/>.
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//! EIP-191 compliant decoding + hashing
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use v1::types::{EIP191Version, Bytes, PresignedTransaction};
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use eip_712::{hash_structured_data, EIP712};
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use serde_json::{Value, from_value};
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use v1::helpers::errors;
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use jsonrpc_core::Error;
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use v1::helpers::dispatch::eth_data_hash;
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use hash::keccak;
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use std::fmt::Display;
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use ethereum_types::H256;
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/// deserializes and hashes the message depending on the version specifier
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pub fn hash_message(version: EIP191Version, message: Value) -> Result<H256, Error> {
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let data = match version {
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EIP191Version::StructuredData => {
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let typed_data = from_value::<EIP712>(message)
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.map_err(map_serde_err("StructuredData"))?;
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hash_structured_data(typed_data)
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.map_err(|err| errors::invalid_call_data(err.kind()))?
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}
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EIP191Version::PresignedTransaction => {
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let data = from_value::<PresignedTransaction>(message)
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.map_err(map_serde_err("WithValidator"))?;
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let prefix = b"\x19\x00";
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let data = [&prefix[..], &data.validator.0[..], &data.data.0[..]].concat();
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keccak(data)
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}
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EIP191Version::PersonalMessage => {
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let bytes = from_value::<Bytes>(message)
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.map_err(map_serde_err("Bytes"))?;
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eth_data_hash(bytes.0)
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}
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};
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Ok(data)
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}
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fn map_serde_err<T: Display>(struct_name: &'static str) -> impl Fn(T) -> Error {
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move |error: T| {
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errors::invalid_call_data(format!("Error deserializing '{}': {}", struct_name, error))
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}
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}
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