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