nimbus-eth2/tests/fuzzing/ssz_fuzzing.nim

50 lines
1.5 KiB
Nim

# beacon_chain
# Copyright (c) 2021-2024 Status Research & Development GmbH
# Licensed and distributed under either of
# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
# at your option. This file may not be copied, modified, or distributed except according to those terms.
{.push raises: [].}
import
testutils/fuzzing, faststreams/inputs, serialization/testing/tracing,
../../beacon_chain/spec/datatypes/base
export
ssz, base, fuzzing
template sszFuzzingTest*(T: type) =
test:
block:
let input = unsafeMemoryInput(payload)
let decoded = try: input.readValue(SSZ, T)
except SSZError: break
if input.len.get > 0:
# Some unconsumed input remained, this is not a valid test case
break
let reEncoded = SSZ.encode(decoded)
when T isnot SignedBeaconBlock:
let hash = hash_tree_root(decoded)
if payload != reEncoded:
when hasSerializationTracing:
# Run deserialization again to produce a seriazation trace
# (this is useful for comparing with the initial deserialization)
discard SSZ.decode(reEncoded, T)
echo "Payload with len = ", payload.len
echo payload
echo "Re-encoided payload with len = ", reEncoded.len
echo reEncoded
when T isnot SignedBeaconBlock:
echo "HTR: ", hash
echo repr(decoded)
doAssert false