plugeth/tests/fuzzers/bls12381/precompile_fuzzer.go

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// Copyright 2020 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package bls
import (
"bytes"
"fmt"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/vm"
)
const (
blsG1Add = byte(10)
blsG1Mul = byte(11)
blsG1MultiExp = byte(12)
blsG2Add = byte(13)
blsG2Mul = byte(14)
blsG2MultiExp = byte(15)
blsPairing = byte(16)
blsMapG1 = byte(17)
blsMapG2 = byte(18)
)
func FuzzG1Add(data []byte) int { return fuzz(blsG1Add, data) }
func FuzzG1Mul(data []byte) int { return fuzz(blsG1Mul, data) }
func FuzzG1MultiExp(data []byte) int { return fuzz(blsG1MultiExp, data) }
func FuzzG2Add(data []byte) int { return fuzz(blsG2Add, data) }
func FuzzG2Mul(data []byte) int { return fuzz(blsG2Mul, data) }
func FuzzG2MultiExp(data []byte) int { return fuzz(blsG2MultiExp, data) }
func FuzzPairing(data []byte) int { return fuzz(blsPairing, data) }
func FuzzMapG1(data []byte) int { return fuzz(blsMapG1, data) }
func FuzzMapG2(data []byte) int { return fuzz(blsMapG2, data) }
func checkInput(id byte, inputLen int) bool {
switch id {
case blsG1Add:
return inputLen == 256
case blsG1Mul:
return inputLen == 160
case blsG1MultiExp:
return inputLen%160 == 0
case blsG2Add:
return inputLen == 512
case blsG2Mul:
return inputLen == 288
case blsG2MultiExp:
return inputLen%288 == 0
case blsPairing:
return inputLen%384 == 0
case blsMapG1:
return inputLen == 64
case blsMapG2:
return inputLen == 128
}
panic("programmer error")
}
// The function must return
//
// - 1 if the fuzzer should increase priority of the
// given input during subsequent fuzzing (for example, the input is lexically
// correct and was parsed successfully);
// - -1 if the input must not be added to corpus even if gives new coverage; and
// - 0 otherwise
//
// other values are reserved for future use.
func fuzz(id byte, data []byte) int {
// Even on bad input, it should not crash, so we still test the gas calc
precompile := vm.PrecompiledContractsBLS[common.BytesToAddress([]byte{id})]
gas := precompile.RequiredGas(data)
if !checkInput(id, len(data)) {
return 0
}
// If the gas cost is too large (25M), bail out
if gas > 25*1000*1000 {
return 0
}
cpy := make([]byte, len(data))
copy(cpy, data)
_, err := precompile.Run(cpy)
if !bytes.Equal(cpy, data) {
panic(fmt.Sprintf("input data modified, precompile %d: %x %x", id, data, cpy))
}
if err != nil {
return 0
}
return 1
}