@disco3/signatures

v0.1.0

Motivation

Reduce gas and size for ECDSA Signature Methods, reduce imported bloat, etc.

Benchmarks

Openzeppelin

Disco

Changes

Following changes have been made and tested

Strings

Strings.sol includes the needed SafeMath logic that was removed in 4.8.0 of OpenZeppelin/Contracts. This reduces the size of the compiled contract by 50%.

ECDSA

Assembly changes

    /**
     * @dev Returns an Ethereum Signed Message, created from `s`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n", Strings.toString(s.length), s));
    }

    /**
     * @dev Returns an Ethereum Signed Typed Data, created from a
     * `domainSeparator` and a `structHash`. This produces hash corresponding
     * to the one signed with the
     * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]
     * JSON-RPC method as part of EIP-712.
     *
     * See {recover}.
     */
    function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32 data) {
        /// @solidity memory-safe-assembly
        assembly {
            let ptr := mload(0x40)
            mstore(ptr, "\x19\x01")
            mstore(add(ptr, 0x02), domainSeparator)
            mstore(add(ptr, 0x22), structHash)
            data := keccak256(ptr, 66)
        }
    }

@startuml

' -- classes --


abstract ECDSA {
    ' -- inheritance --

    ' -- usingFor --

    ' -- vars --

    ' -- methods --
	-_throwError()
	#tryRecover()
	#recover()
	#tryRecover()
	#recover()
	#tryRecover()
	#recover()
	#toEthSignedMessageHash()
	#toEthSignedMessageHash()
	#toTypedDataHash()

}
' -- inheritance / usingFor --

@enduml

License

Licensed under either of

• Universal Permissive License 1.0 (LICENSE-UPL or https://opensource.org/licenses/UPL)

• MIT License (LICENSE-MIT or https://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Universal Permissive License v 1.0 license, shall be dual licensed as above, without any additional terms or conditions.