191 lines
5.0 KiB
Rust
191 lines
5.0 KiB
Rust
// Copyright 2015-2018 Parity Technologies (UK) Ltd.
|
||
// This file is part of Parity.
|
||
|
||
// Parity is free software: you can redistribute it and/or modify
|
||
// it under the terms of the GNU General Public License as published by
|
||
// the Free Software Foundation, either version 3 of the License, or
|
||
// (at your option) any later version.
|
||
|
||
// Parity is distributed in the hope that it will be useful,
|
||
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
// GNU General Public License for more details.
|
||
|
||
// You should have received a copy of the GNU General Public License
|
||
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
|
||
|
||
//! EIP-712 encoding utilities
|
||
//!
|
||
//! # Specification
|
||
//!
|
||
//! `encode(domainSeparator : 𝔹²⁵⁶, message : 𝕊) = "\x19\x01" ‖ domainSeparator ‖ hashStruct(message)`
|
||
//! - data adheres to 𝕊, a structure defined in the rigorous eip-712
|
||
//! - `\x01` is needed to comply with EIP-191
|
||
//! - `domainSeparator` and `hashStruct` are defined below
|
||
//!
|
||
//! ## A) domainSeparator
|
||
//!
|
||
//! `domainSeparator = hashStruct(eip712Domain)`
|
||
//! <br/>
|
||
//! <br/>
|
||
//! Struct named `EIP712Domain` with the following fields
|
||
//!
|
||
//! - `name: String`
|
||
//! - `version: String`
|
||
//! - `chain_id: U256`,
|
||
//! - `verifying_contract: H160`
|
||
//! - `salt: Option<H256>`
|
||
//!
|
||
//! ## C) hashStruct
|
||
//!
|
||
//! `hashStruct(s : 𝕊) = keccak256(typeHash ‖ encodeData(s))`
|
||
//! <br/>
|
||
//! `typeHash = keccak256(encodeType(typeOf(s)))`
|
||
//!
|
||
//! ### i) encodeType
|
||
//!
|
||
//! - `name ‖ "(" ‖ member₁ ‖ "," ‖ member₂ ‖ "," ‖ … ‖ memberₙ ")"`
|
||
//! - each member is written as `type ‖ " " ‖ name`
|
||
//! - encodings cascade down and are sorted by name
|
||
//!
|
||
//! ### ii) encodeData
|
||
//!
|
||
//! - `enc(value₁) ‖ enc(value₂) ‖ … ‖ enc(valueₙ)`
|
||
//! - each encoded member is 32-byte long
|
||
//!
|
||
//! #### a) atomic
|
||
//!
|
||
//! - `boolean` => `U256`
|
||
//! - `address` => `H160`
|
||
//! - `uint` => sign-extended `U256` in big endian order
|
||
//! - `bytes1:31` => `H@256`
|
||
//!
|
||
//! #### b) dynamic
|
||
//!
|
||
//! - `bytes` => `keccak256(bytes)`
|
||
//! - `string` => `keccak256(string)`
|
||
//!
|
||
//! #### c) referenced
|
||
//!
|
||
//! - `array` => `keccak256(encodeData(array))`
|
||
//! - `struct` => `rec(keccak256(hashStruct(struct)))`
|
||
//!
|
||
//! ## D) Example
|
||
//! ### Query
|
||
//! ```json
|
||
//! {
|
||
//! "jsonrpc": "2.0",
|
||
//! "method": "eth_signTypedData",
|
||
//! "params": [
|
||
//! "0xCD2a3d9F938E13CD947Ec05AbC7FE734Df8DD826",
|
||
//! {
|
||
//! "types": {
|
||
//! "EIP712Domain": [
|
||
//! {
|
||
//! "name": "name",
|
||
//! "type": "string"
|
||
//! },
|
||
//! {
|
||
//! "name": "version",
|
||
//! "type": "string"
|
||
//! },
|
||
//! {
|
||
//! "name": "chainId",
|
||
//! "type": "uint256"
|
||
//! },
|
||
//! {
|
||
//! "name": "verifyingContract",
|
||
//! "type": "address"
|
||
//! }
|
||
//! ],
|
||
//! "Person": [
|
||
//! {
|
||
//! "name": "name",
|
||
//! "type": "string"
|
||
//! },
|
||
//! {
|
||
//! "name": "wallet",
|
||
//! "type": "address"
|
||
//! }
|
||
//! ],
|
||
//! "Mail": [
|
||
//! {
|
||
//! "name": "from",
|
||
//! "type": "Person"
|
||
//! },
|
||
//! {
|
||
//! "name": "to",
|
||
//! "type": "Person"
|
||
//! },
|
||
//! {
|
||
//! "name": "contents",
|
||
//! "type": "string"
|
||
//! }
|
||
//! ]
|
||
//! },
|
||
//! "primaryType": "Mail",
|
||
//! "domain": {
|
||
//! "name": "Ether Mail",
|
||
//! "version": "1",
|
||
//! "chainId": 1,
|
||
//! "verifyingContract": "0xCcCCccccCCCCcCCCCCCcCcCccCcCCCcCcccccccC"
|
||
//! },
|
||
//! "message": {
|
||
//! "from": {
|
||
//! "name": "Cow",
|
||
//! "wallet": "0xCD2a3d9F938E13CD947Ec05AbC7FE734Df8DD826"
|
||
//! },
|
||
//! "to": {
|
||
//! "name": "Bob",
|
||
//! "wallet": "0xbBbBBBBbbBBBbbbBbbBbbbbBBbBbbbbBbBbbBBbB"
|
||
//! },
|
||
//! "contents": "Hello, Bob!"
|
||
//! }
|
||
//! }
|
||
//! ],
|
||
//! "id": 1
|
||
//! }
|
||
//! ```
|
||
//
|
||
//! ### Response
|
||
//! ```json
|
||
//! {
|
||
//! "id":1,
|
||
//! "jsonrpc": "2.0",
|
||
//! "result": "0x4355c47d63924e8a72e509b65029052eb6c299d53a04e167c5775fd466751c9d07299936d304c153f6443dfa05f40ff007d72911b6f72307f996231605b915621c"
|
||
//! }
|
||
//! ```
|
||
|
||
#![warn(missing_docs, unused_extern_crates)]
|
||
|
||
extern crate serde_json;
|
||
extern crate ethabi;
|
||
extern crate ethereum_types;
|
||
extern crate keccak_hash;
|
||
extern crate itertools;
|
||
extern crate failure;
|
||
extern crate indexmap;
|
||
extern crate lunarity_lexer;
|
||
extern crate toolshed;
|
||
extern crate regex;
|
||
extern crate validator;
|
||
#[macro_use]
|
||
extern crate validator_derive;
|
||
#[macro_use]
|
||
extern crate serde_derive;
|
||
#[macro_use]
|
||
extern crate lazy_static;
|
||
extern crate rustc_hex;
|
||
|
||
mod eip712;
|
||
mod error;
|
||
mod parser;
|
||
mod encode;
|
||
|
||
/// the EIP-712 encoding function
|
||
pub use encode::hash_structured_data;
|
||
/// encoding Error types
|
||
pub use error::{ErrorKind, Error};
|
||
/// EIP712 struct
|
||
pub use eip712::EIP712;
|