[EIP-712] Invalid TypedData encoding with specific int/uint sizes (e.g. int24)

[valdikamenarov]

System information

Geth version: 1.10.25
OS & Version: Ubuntu 20.04.5 LTS

Description

Typed Data providing int/uint types that differ from the primitive golang types are not supported while being valid Solidity types.

According to EIP-712 atomic types of type int/uint can be a size ranging between 8 - 256 bits

Expected behaviour

Should be able to successfully encode typed data with valid int/uint types between 8 - 256.

Actual behaviour

Encoding fails due to unknown primitive type.

Steps to reproduce the behaviour

package main

import (
	"github.com/ethereum/go-ethereum/common/math"
	"github.com/ethersphere/bee/pkg/crypto/eip712"
)

func main() {
	typedData := eip712.TypedData{
		Domain: eip712.TypedDataDomain{
			Name:    "ABC",
			Version: "0.0.1",
			ChainId: math.NewHexOrDecimal256(1),
		},
		Types: eip712.Types{
			"EIP712Domain": {
				{Name: "name", Type: "string"},
				{Name: "version", Type: "string"},
				{Name: "chainId", Type: "uint256"},
				{Name: "verifyingContract", Type: "address"},
			},
			"MainType": {
				{Name: "number1", Type: "int160"}, // missing valid Solidity type.
				{Name: "number2", Type: "int24"},  // missing valid Solidity type.
			},
		},
		PrimaryType: "MainType",
		Message: eip712.TypedDataMessage{
			"number1": "13",
			"number2": "13",
		},
	}

	_, err := typedData.HashStruct("EIP712Domain", typedData.Domain.Map())
	if err != nil {
		panic(err)
	}
	_, err = typedData.HashStruct(typedData.PrimaryType, typedData.Message)
	if err != nil {
		panic(err)
	}
}

Error

unknown type "int160"
unknown type "int24"

P.S. Issue was raised here as suggested by the go-ethereum community (ethereum/go-ethereum#25932)

[valdikamenarov]

Resolved here ethereum/go-ethereum#26770