diff --git a/.gitattributes b/.gitattributes new file mode 100644 index 0000000..18bdf0d --- /dev/null +++ b/.gitattributes @@ -0,0 +1 @@ +benchmark/datasets/*.tar.gz filter=lfs diff=lfs merge=lfs -text diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml new file mode 100644 index 0000000..8742f84 --- /dev/null +++ b/.github/workflows/release.yml @@ -0,0 +1,75 @@ +name: release + +permissions: + contents: write + +on: + push: + tags: + - '*.*.*' + +jobs: + build: + runs-on: ubuntu-latest + steps: + - uses: actions/checkout@v4 + with: + fetch-depth: 0 # need tags to generate release notes + + - name: Install Python + uses: actions/setup-python@v4 + with: + python-version: '3.11' + + - name: Install NodeJS + uses: actions/setup-node@v4 + with: + node-version: 20 + + - name: Install python poetry + run: | + curl -sSL https://install.python-poetry.org | python - + echo "$HOME/.poetry/bin" >> $GITHUB_PATH + + - name: Python - check and build + id: buildpy + run: | + poetry install + poetry run ruff evmole + poetry run black --check evmole + poetry build + echo "wheel_name=evmole-${GITHUB_REF#refs/tags/}-py3-none-any.whl" >> $GITHUB_OUTPUT + + + - name: NodeJS - check and build + id: buildjs + run: | + cd js/ + npm ci + npm run build + npm pack + echo "tarball_name=evmole-${GITHUB_REF#refs/tags/}.tgz" >> $GITHUB_OUTPUT + + - name: Generate Release Notes + run: | + echo '## Changes since previous release:' > changelog.md + git log --oneline $(git describe --tags --abbrev=0 HEAD^)..HEAD --pretty=format:"- [%h](https://github.com/cdump/evmole/commit/%H) %s" >> changelog.md + + - name: Release + uses: softprops/action-gh-release@v1 + with: + name: Release ${{ github.ref_name }} + draft: false + prerelease: false + body_path: changelog.md + files: | + dist/${{ steps.buildpy.outputs.wheel_name }} + js/${{ steps.buildjs.outputs.tarball_name }} + + - name: Publish to NPM and PyPI + env: + POETRY_PYPI_TOKEN_PYPI: ${{ secrets.PYPI_TOKEN }} + NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }} + run: | + poetry publish + npm publish diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..9907607 --- /dev/null +++ b/.gitignore @@ -0,0 +1,10 @@ +benchmark/datasets/* +!benchmark/datasets/*.tar.gz + +benchmark/results/* +!benchmark/results/.gitkeep + +__pycache__/ +node_modules/ + +dist/ diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..5f31d41 --- /dev/null +++ b/LICENSE @@ -0,0 +1,21 @@ +MIT License + +Copyright (c) 2023 Maxim Andreev + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. diff --git a/README.md b/README.md new file mode 100644 index 0000000..0444c68 --- /dev/null +++ b/README.md @@ -0,0 +1,126 @@ +# EVMole + +[![PyPI](https://img.shields.io/pypi/v/evmole)](https://pypi.org/project/evmole) +[![npm](https://img.shields.io/npm/v/evmole)](https://www.npmjs.com/package/evmole) +[![license](https://img.shields.io/github/license/cdump/evmole)](./LICENSE) + +Extracts [function selectors](https://docs.soliditylang.org/en/latest/abi-spec.html#function-selector) from EVM bytecode, even for unverified contracts. + +- Python & JavaScript implementations +- Clean code with zero dependencies +- [Faster and more accurate](#Benchmark) than other tools +- Tested on Solidity and Vyper compiled contracts + +## Usage + +### JavaScript +```sh +$ npm i 'evmole' +``` +```javascript +import {functionSelectors} from 'evmole' + +const code = '0x6080604052600436106025575f3560e01c8063b69ef8a8146029578063d0e30db014604d575b5f80fd5b3480156033575f80fd5b50603b5f5481565b60405190815260200160405180910390f35b60536055565b005b345f8082825460639190606a565b9091555050565b80820180821115608857634e487b7160e01b5f52601160045260245ffd5b9291505056fea2646970667358221220354240f63068d555e9b817619001b0dff6ea630d137edc1a640dae8e3ebb959864736f6c63430008170033' +console.log( functionSelectors(code) ) +// Output(list): [ 'b69ef8a8', 'd0e30db0' ] +``` + +### Python +```sh +$ pip install evmole +``` +```python +from evmole import function_selectors + +code = '0x6080604052600436106025575f3560e01c8063b69ef8a8146029578063d0e30db014604d575b5f80fd5b3480156033575f80fd5b50603b5f5481565b60405190815260200160405180910390f35b60536055565b005b345f8082825460639190606a565b9091555050565b80820180821115608857634e487b7160e01b5f52601160045260245ffd5b9291505056fea2646970667358221220354240f63068d555e9b817619001b0dff6ea630d137edc1a640dae8e3ebb959864736f6c63430008170033' +print( function_selectors(code) ) +# Output(list): ['b69ef8a8', 'd0e30db0'] +``` + +See [examples](./examples) for more + +## Benchmark + +FP/FN - [False Positive/False Negative](https://en.wikipedia.org/wiki/False_positives_and_false_negatives) errors; smaller is better + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
Datasetsimplewhatsabievmole-js (py)
largest1k
1000 contracts
24427 functions		FP/FN contracts:95 / 938 / 81 / 0 :1st_place_medal:
FP/FN functions:749 / 1238 / 8 :1st_place_medal: :2nd_place_medal:192 / 0 :2nd_place_medal: :1st_place_medal:
Time:2.06s3.8s1.99s (2.09s) :rocket:
random50k
50000 contracts
1171102 functions		FP/FN contracts:4136 / 77251 / 311 / 9 :1st_place_medal:
FP/FN functions:14652 / 96261 / 323 / 10 :1st_place_medal:
Time:32.3s71.13s25.63s (33.56s) :rocket:
vyper
780 contracts
21244 functions		FP/FN contracts:185 / 480178 / 7800 / 0 :1st_place_medal:
FP/FN functions:197 / 12971181 / 212440 / 0 :1st_place_medal:
Time:1.71s2.52s1.58s (1.8s) :rocket:
+ +See [benchmark/README.md](./benchmark/) for the methodology and commands to reproduce these results + + +## How it works + +Short: Executes code with a custom EVM and traces CALLDATA usage. + +Long: TODO + + +## License +MIT diff --git a/benchmark/Makefile b/benchmark/Makefile new file mode 100644 index 0000000..201b86e --- /dev/null +++ b/benchmark/Makefile @@ -0,0 +1,38 @@ +PROVIDERS ?= etherscan simple whatsabi evmole-py evmole-js +DATASETS ?= largest1k random50k vyper +DOCKER ?= docker +DOCKER_CPUS ?= 1 +DOCKER_PREFIX ?= evmole-bench + +DATASET=$(shell pwd)/datasets +RES=$(shell pwd)/results + +BUILD_TARGETS=$(addsuffix .build, $(PROVIDERS)) +RUN_TARGETS=$(foreach p,$(PROVIDERS),$(addprefix $(p)/, $(DATASETS))) +UNPACK_TARGETS=$(foreach d,$(DATASETS),$(addprefix datasets/, $(d))) + +benchmark: build run + +build: $(BUILD_TARGETS) + +run: $(RUN_TARGETS) + +$(BUILD_TARGETS): + $(info [*] Building $(basename $@)...) + # special hack for evmole: + [ "$@" = "evmole-py.build" ] && cp -r ../evmole providers/evmole-py/ || true + [ "$@" = "evmole-js.build" ] && cp -r ../js providers/evmole-js/ || true + $(DOCKER) build -t $(DOCKER_PREFIX)-$(basename $@) providers/$(basename $@) + [ "$@" = "evmole-py.build" ] && rm -rf providers/evmole-py/evmole || true + [ "$@" = "evmole-js.build" ] && rm -rf providers/evmole-js/js || true + +$(UNPACK_TARGETS): + $(info [*] Unpacking $@...) + tar -C datasets/ -zxf $@.tar.gz + +.SECONDEXPANSION: +$(RUN_TARGETS): datasets/$$(notdir $$@) + $(info [*] Running $@...) + /bin/time -f '%e' $(DOCKER) run --cpus=$(DOCKER_CPUS) --rm -v $(DATASET)/$(notdir $@):/dataset -v $(RES):/mnt -it $(DOCKER_PREFIX)-$(subst /,,$(dir $@)) /dataset /mnt/$(subst /,_,$@).json 2> $(RES)/$(subst /,_,$@).time + +.PHONY: benchmark build run $(BUILD_TARGETS) $(RUN_TARGETS) diff --git a/benchmark/README.md b/benchmark/README.md new file mode 100644 index 0000000..837c7b3 --- /dev/null +++ b/benchmark/README.md @@ -0,0 +1,80 @@ +# Benchmarks + +Test accuracy and speed of different function-signature extractors + +For results, refer to the [main README.md](../README.md#Benchmark). + +## Methodology +1. Get N Etherscan-verified contracts, save the bytecode and ABI to `datasets/NAME/ADDR.json`. +2. Extract function signatures from the bytecode. Each tool runs inside a Docker container and is limited to 1 CPU (see `providers/NAME` and `Makefile`). +3. Assume selectors from Etherscan's ABI as ground truth. +4. Compare the results with it and count [False Positives and False Negatives](https://en.wikipedia.org/wiki/False_positives_and_false_negatives). + +## Reproduce +Set the performance mode using `sudo cpupower frequency-set -g performance` and run `make` ([GNU Make](https://www.gnu.org/software/make/)) inside the `benchmark/` directory. + +To use [Podman](https://podman.io/) instead of Docker: `DOCKER=podman make` + + +You can run only specific step; for example: +```sh +# Only build docker-images +$ make build + +# Only run tests +$ make run + +# Build `etherscan` docker image +$ make etherscan.build + +# Run `etherscan` on dataset `largest1k` +$ make etherscan/largest1k +``` + +To process results run `compare.py`: +```sh +$ python3 compare.py + +# compare in web-browser +$ ../.venv/bin/python3 compare.py --web-listen 127.0.0.1:8080 +``` + + +## How datasets/ was constructed + +1. Clone [tintinweb/smart-contract-sanctuary](https://github.com/tintinweb/smart-contract-sanctuary) + +2. Find all solidity contracts: +```sh +$ cd smart-contract-sanctuary/ethereum/contracts/mainnet/ + +# (contract_size_in_bytes) (contract_file_path) +$ find ./ -name "*.sol" -printf "%s %p\n" > all.txt +``` + +3. Get ~1200 largest (by size) contracts: +```sh +$ cat all.txt | sort -rn | head -n 1200 | cut -d'/' -f3 | cut -d'_' -f1 > top.txt +``` + +4. Get ~55.000 random contracts +```sh +$ cat all.txt | cut -d'/' -f3 | cut -d'_' -f1 | sort -u | shuf | head -n 55000 > random.txt +``` + +5. Get all vyper contracts: +```sh +$ find ./ -type f -name '*.vy' | cut -d'/' -f3 | cut -d'_' -f1 > vyper.txt +``` + +6. Download contracts code & abi: +```sh +$ poetry run python3 datasets/download.py --etherscan-api-key=CHANGE_ME --addrs-list=top.txt --out-dir=datasets/largest_1k --limit=1000 --code-regexp='^0x(?!73).' +$ poetry run python3 datasets/download.py --etherscan-api-key=CHANGE_ME --addrs-list=random.txt --out-dir=datasets/random_10k --limit=10000 --code-regexp='^0x(?!73).' +$ poetry run python3 datasets/download.py --etherscan-api-key=CHANGE_ME --addrs-list=vyper.txt --out-dir=datasets/vyper --code-regexp='^0x(?!73).' +``` + +We use `--code-regexp='^0x(?!73).'` to: +1. Skip contract with empty code (`{"code": "0x",`) - these are self-destructed contracts. +2. Skip contract with code starting from `0x73` (`PUSH20` opcode). +Compiled Solidity libraries [begins with this code](https://docs.soliditylang.org/en/v0.8.23/contracts.html#call-protection-for-libraries), and because [Non-storage structs are referred to by their fully qualified name](https://docs.soliditylang.org/en/v0.8.23/contracts.html#function-signatures-and-selectors-in-libraries) it's not yet supported by our reference Etherscan extractor (`providers/etherscan`). This issue may be fixed later. diff --git a/benchmark/compare.py b/benchmark/compare.py new file mode 100644 index 0000000..504ac42 --- /dev/null +++ b/benchmark/compare.py @@ -0,0 +1,143 @@ +import argparse +import json +import pathlib + +def process_dataset(dname: str, providers: list[str], results_dir: str): + pdata = [] + ptimes = [] + for pname in providers: + with open(f'{results_dir}/{pname}_{dname}.json', 'r') as fh: + pdata.append(json.load(fh)) + with open(f'{results_dir}/{pname}_{dname}.time', 'r') as fh: + ptimes.append(float(fh.read())) + + ret = [] + for fname, gt in pdata[0].items(): + gt_set = set(gt) + data = [] + for i in range(1, len(providers)): # skip ground_truth provider + d = set(pdata[i].get(fname, [])) + fp = list(d - gt_set) + fn = list(gt_set - d) + data.append([fp, fn]) + ret.append({ + 'addr': fname[2:-5], # '0xFF.json' => 'FF' + 'ground_truth': gt, + 'data': data, + }) + return {'dataset': dname, 'results': ret, 'timings': ptimes[1:]} + + +def markdown(providers: list[str], all_results: list): + # :1st_place_medal: :rocket: :zap: + print('') + print(' ') + print(' ') + print(' ') + for name in providers[1:]: + print(f' ') + print(' ') + for dataset_idx, dataset_result in enumerate(all_results): + dataset_name = dataset_result['dataset'] + cnt_contracts = len(dataset_result['results']) + cnt_signatures = sum(len(x['ground_truth']) for x in dataset_result['results']) + print(' ') + print(f' ') + print(' ') + for idx in range(0, len(providers) - 1): # skip ground_truth provider + fp_contracts = sum(len(x['data'][idx][0]) > 0 for x in dataset_result['results']) + fn_contracts = sum(len(x['data'][idx][1]) > 0 for x in dataset_result['results']) + print(f' ') + print(' ') + print(' ') + print(' ') + for idx in range(0, len(providers) - 1): # skip ground_truth provider + fp_signatures = sum(len(x['data'][idx][0]) for x in dataset_result['results']) + fn_signatures = sum(len(x['data'][idx][1]) for x in dataset_result['results']) + print(f' ') + print(' ') + print(' ') + print(' ') + for idx in range(0, len(providers) - 1): # skip ground_truth provider + print(f' ') + print(' ') + if dataset_idx != len(all_results) - 1: + print(f' ') + print('
Dataset{name}
{dataset_name}
{cnt_contracts} contracts
{cnt_signatures} functions		FP/FN contracts:{fp_contracts} / {fn_contracts}
FP/FN functions:{fp_signatures} / {fn_signatures}
Time:{dataset_result["timings"][idx]}s
') + + +def serve_web(listen_host: str, listen_port:int, providers: list[str], all_results: list): + """ + { + "providers": ["etherscan", "a", "b"], + "results": [ + { + "dataset": "name", + "timings": [1.2, 0.33], # for every provider + "results": [ + { + "addr": "address", + "ground_truth": ["00aabbcc", "ddeeff22"], + "data": [ + [["fp"], ["fn"]], # 1st provider errors + [["fp"], ["fn"]], # 2nd provider errors + ], + }, + ] + } + ], + } + """ + data = {'providers': providers, 'results': all_results} + json_data = json.dumps(data, separators=(',', ':')) + async def handle_index(_): + return web.FileResponse(pathlib.Path(__file__).parent / 'index.html') + async def handle_res(_): + return web.Response(body=json_data, headers={'Content-Type': 'application/json'}) + app = web.Application() + app.add_routes([web.get('/', handle_index), web.get('/res.json', handle_res)]) + web.run_app(app, host=listen_host, port=listen_port) + + +def show(providers: list[str], all_results: list): + for dataset_result in all_results: + cnt_contracts = len(dataset_result['results']) + cnt_signatures = sum(len(x['ground_truth']) for x in dataset_result['results']) + for provider_idx, name in enumerate(providers[1:]): + fp_signatures = sum(len(x['data'][provider_idx][0]) for x in dataset_result['results']) + fn_signatures = sum(len(x['data'][provider_idx][1]) for x in dataset_result['results']) + fp_contracts = sum(len(x['data'][provider_idx][0]) > 0 for x in dataset_result['results']) + fn_contracts = sum(len(x['data'][provider_idx][1]) > 0 for x in dataset_result['results']) + print(f'dataset {dataset_result["dataset"]} ({cnt_contracts} contracts, {cnt_signatures} signatures), {name}:') + print(f' time: {dataset_result["timings"][provider_idx]}s') + print(f' False Positive: {fp_signatures} signatures, {fp_contracts} contracts') + print(f' False Negative: {fn_signatures} signatures, {fn_contracts} contracts') + print('') + print('') + pass + + +if __name__ == '__main__': + parser = argparse.ArgumentParser() + parser.add_argument('--results-dir', type=str, default=pathlib.Path(__file__).parent / 'results', help='results directory') + parser.add_argument('--providers', nargs='+', default=['etherscan', 'simple', 'whatsabi', 'evmole-py', 'evmole-js']) + parser.add_argument('--datasets', nargs='+', default=['largest1k', 'random50k', 'vyper']) + parser.add_argument('--web-listen', type=str, default='', help='start webserver to serve results, example: "127.0.0.1:8080"') + parser.add_argument('--markdown', nargs='?', default=False, const=True, help='show markdown output') + cfg = parser.parse_args() + print('Config:') + print('\n'.join(f' {field} = {getattr(cfg, field)}' for field in vars(cfg)), '\n') + + if cfg.web_listen != '': + from aiohttp import web + + results = [process_dataset(d, cfg.providers, cfg.results_dir) for d in cfg.datasets] + + if cfg.markdown: + markdown(cfg.providers, results) + else: + show(cfg.providers, results) + + if cfg.web_listen != '': + host, port = cfg.web_listen.rsplit(':') + serve_web(host, int(port), cfg.providers, results) diff --git a/benchmark/datasets/largest1k.tar.gz b/benchmark/datasets/largest1k.tar.gz new file mode 100644 index 0000000..0f9806d --- /dev/null +++ b/benchmark/datasets/largest1k.tar.gz @@ -0,0 +1,3 @@ +version https://git-lfs.github.com/spec/v1 +oid sha256:a24efc6b81a8ed3fc9776de18e5215f6a7c618df7e3015ee967ee44b469a961f +size 7076010 diff --git a/benchmark/datasets/random50k.tar.gz b/benchmark/datasets/random50k.tar.gz new file mode 100644 index 0000000..e9d24f5 --- /dev/null +++ b/benchmark/datasets/random50k.tar.gz @@ -0,0 +1,3 @@ +version https://git-lfs.github.com/spec/v1 +oid sha256:68a2516bb70df861a2b0ebd0c750d50843f3815602a3174822cf0fec8ac56e59 +size 200248543 diff --git a/benchmark/datasets/vyper.tar.gz b/benchmark/datasets/vyper.tar.gz new file mode 100644 index 0000000..2bda2b3 --- /dev/null +++ b/benchmark/datasets/vyper.tar.gz @@ -0,0 +1,3 @@ +version https://git-lfs.github.com/spec/v1 +oid sha256:924540a4579829389e423f1f3f151d5db9748b68f295dac350a508319840d8a5 +size 2985881 diff --git a/benchmark/download.py b/benchmark/download.py new file mode 100644 index 0000000..163a7c7 --- /dev/null +++ b/benchmark/download.py @@ -0,0 +1,98 @@ +import argparse +import json +import re +import os + +import aiohttp +import asyncio + +saved_cnt = 0 + +async def worker(cfg, q: asyncio.Queue): + global saved_cnt + async with aiohttp.ClientSession() as session: + while True: + addr = await q.get() + if addr is None: + break + out_path = f'{cfg.out_dir}/{addr}.json' + + print(f'Begin {addr} process') + if os.path.isfile(out_path): + print(f'Skip {addr}: already exists') + saved_cnt += 1 + continue + + if cfg.limit != 0 and saved_cnt >= cfg.limit: + print(f'Skip {addr}: limit reached') + continue + + req = {'method':'eth_getCode','params':[addr, 'latest'],'id':1,'jsonrpc':'2.0'} + async with session.post(cfg.rpc_url, json=req) as r: + code = (await r.json())['result'] + if not cfg.code_regexp.match(code): + print(f'Skip {addr}: regexp not matched') + continue + + u = f'https://api.etherscan.io/api?module=contract&action=getabi&apikey={cfg.etherscan_api_key}&address={addr}' + async with session.get(u) as r: + abi = (await r.json())['result'] + if abi == 'Contract source code not verified': + print(f'Skip {addr}: {abi}') + await asyncio.sleep(cfg.threads * 0.3) # dirty hack: limit ~3 rps for etherscan + continue + assert abi.startswith('['), abi + abi = json.loads(abi) + + await asyncio.sleep(cfg.threads * 0.3) # dirty hack: limit ~3 rps for etherscan + + if cfg.limit != 0 and saved_cnt >= cfg.limit: + print(f'Skip {addr}: limit reached') + continue + + with open(out_path, 'w') as fh: + json.dump({'code': code, 'abi': abi}, fh) + saved_cnt += 1 + print(f'Saved {addr}, {saved_cnt}th address') + + +async def reader(cfg, q: asyncio.Queue): + with open(cfg.addrs_list, 'r') as fh: + for line in fh: + if cfg.limit != 0 and saved_cnt >= cfg.limit: + break + addr = line.rstrip() + if not addr.startswith('0x'): + addr = f'0x{addr}' + await q.put(addr) + + for _ in range(cfg.threads): + await q.put(None) + + +async def main(): + parser = argparse.ArgumentParser() + parser.add_argument('--addrs-list', type=str, required=True, help='file with contract addresses') + parser.add_argument('--out-dir', type=str, required=True, help='output directory') + parser.add_argument('--rpc-url', type=str, default='http://127.0.0.1:8545', help='rpc url of ethereum node') + parser.add_argument('--etherscan-api-key', type=str, required=True, help='etherscan.io api key') + parser.add_argument('--code-regexp', default='', help='code regexp', type=re.compile) + parser.add_argument('--limit', type=int, required=False, default=0, help='limit') + parser.add_argument('--threads', type=int, required=False, default=2, help='threads') + cfg = parser.parse_args() + print('Config:') + print('\n'.join(f' {field} = {getattr(cfg, field)}' for field in vars(cfg)), '\n') + + q = asyncio.Queue(maxsize = cfg.threads) + await asyncio.gather( + reader(cfg, q), + *[worker(cfg, q) for _ in range(cfg.threads)] + ) + print(f'Finished, got {saved_cnt} contracts') + + +if __name__ == '__main__': + try: + asyncio.run(main()) + except KeyboardInterrupt: + pass diff --git a/benchmark/index.html b/benchmark/index.html new file mode 100644 index 0000000..65471a2 --- /dev/null +++ b/benchmark/index.html @@ -0,0 +1,141 @@ + + + + + + EVMole: Benchmark Results + + + + + + +
+ + + + all + any errors + "{{name}}" errors + + + + + + + {{name}} + + + + + + + + + + + + + + + + + + + + + + +
+ + + diff --git a/benchmark/providers/etherscan/Dockerfile b/benchmark/providers/etherscan/Dockerfile new file mode 100644 index 0000000..d38b74a --- /dev/null +++ b/benchmark/providers/etherscan/Dockerfile @@ -0,0 +1,5 @@ +FROM python:3.12-slim +WORKDIR /app +RUN pip3 install pycryptodome==3.19 +COPY main.py /app +ENTRYPOINT ["python3", "/app/main.py"] diff --git a/benchmark/providers/etherscan/main.py b/benchmark/providers/etherscan/main.py new file mode 100644 index 0000000..15612be --- /dev/null +++ b/benchmark/providers/etherscan/main.py @@ -0,0 +1,46 @@ +import json +import os +import sys + +from Crypto.Hash import keccak + +def sign(inp: bytes) -> str: + return keccak.new(digest_bits=256, data=inp).digest()[:4].hex() + +def join_inputs(inputs) -> str: + if len(inputs) == 0: + return '' + n = '' + for v in inputs: + if v['type'].startswith('tuple'): + n += '(' + join_inputs(v['components']) + ')' + v['type'][5:] + else: + n += v['type'] + n += ',' + return n[:-1] + +def process(abi) -> list[str]: + ret = {} + for x in abi: + if x['type'] != 'function': + continue + n = x['name'] + '(' + join_inputs(x['inputs']) + ')' + sg = sign(n.encode('ascii')) + ret[sg] = n + return list(ret.keys()) + +if len(sys.argv) != 3: + print('Usage: python3 main.py INPUT_DIR OUTPUT_FILE') + sys.exit(1) + + +ret = {} +indir = sys.argv[1] +outfile = sys.argv[2] +for fname in os.listdir(indir): + with open(f'{indir}/{fname}', 'r') as fh: + d = json.load(fh) + ret[fname] = process(d['abi']) + +with open(outfile, 'w') as fh: + json.dump(ret, fh) diff --git a/benchmark/providers/evmole-js/Dockerfile b/benchmark/providers/evmole-js/Dockerfile new file mode 100644 index 0000000..472aece --- /dev/null +++ b/benchmark/providers/evmole-js/Dockerfile @@ -0,0 +1,5 @@ +FROM node:21 +WORKDIR /app +COPY main.mjs /app +COPY js /app/js +ENTRYPOINT ["node", "/app/main.mjs"] diff --git a/benchmark/providers/evmole-js/main.mjs b/benchmark/providers/evmole-js/main.mjs new file mode 100644 index 0000000..c822fea --- /dev/null +++ b/benchmark/providers/evmole-js/main.mjs @@ -0,0 +1,22 @@ +import {readdirSync, readFileSync, writeFileSync} from 'fs' + +import {functionSelectors} from './js/src/index.js' + +const argv = process.argv; +if (argv.length != 4) { + console.log('Usage: node main.js INPUT_DIR OUTPUT_FILE') + process.exit(1) +} + +const indir = argv[2]; +const outfile = argv[3]; + +const res = Object.fromEntries( + readdirSync(indir).map( + file => [ + file, + functionSelectors(JSON.parse(readFileSync(`${indir}/${file}`))['code']) + ] + ) +); +writeFileSync(outfile, JSON.stringify(res), 'utf8'); diff --git a/benchmark/providers/evmole-py/Dockerfile b/benchmark/providers/evmole-py/Dockerfile new file mode 100644 index 0000000..b9fb350 --- /dev/null +++ b/benchmark/providers/evmole-py/Dockerfile @@ -0,0 +1,5 @@ +FROM python:3.12-slim +WORKDIR /app +COPY main.py /app +COPY evmole /app/evmole +ENTRYPOINT ["python3", "/app/main.py"] diff --git a/benchmark/providers/evmole-py/main.py b/benchmark/providers/evmole-py/main.py new file mode 100644 index 0000000..6a2bf0c --- /dev/null +++ b/benchmark/providers/evmole-py/main.py @@ -0,0 +1,21 @@ +import json +import os +import sys + +from evmole import function_selectors + +if len(sys.argv) != 3: + print('Usage: python3 main.py INPUT_DIR OUTPUT_FILE') + sys.exit(1) + + +ret = {} +indir = sys.argv[1] +outfile = sys.argv[2] +for fname in os.listdir(indir): + with open(f'{indir}/{fname}', 'r') as fh: + d = json.load(fh) + ret[fname] = function_selectors(bytes.fromhex(d['code'][2:])) + +with open(outfile, 'w') as fh: + json.dump(ret, fh) diff --git a/benchmark/providers/simple/Dockerfile b/benchmark/providers/simple/Dockerfile new file mode 100644 index 0000000..2834737 --- /dev/null +++ b/benchmark/providers/simple/Dockerfile @@ -0,0 +1,4 @@ +FROM python:3.12-slim +WORKDIR /app +COPY main.py /app +ENTRYPOINT ["python3", "/app/main.py"] diff --git a/benchmark/providers/simple/main.py b/benchmark/providers/simple/main.py new file mode 100644 index 0000000..4a89224 --- /dev/null +++ b/benchmark/providers/simple/main.py @@ -0,0 +1,33 @@ +import json +import os +import sys + +def process(code: bytes) -> list[str]: + ret = [] + for i in range(len(code) - 5): + # PUSH2/PUSH3 + if (code[i] == 0x62 or code[i] == 0x63): + off = code[i] - 0x62 + + # EQ or (DUP2 + EQ) + if (code[i+off+4] == 0x14) or (code[i+off+4] == 0x81 and code[i+off+5] == 0x14): + ret.append(code[i+1:i+4+off]) + + return [s.hex().zfill(8) for s in ret] + + +if len(sys.argv) != 3: + print('Usage: python3 main.py INPUT_DIR OUTPUT_FILE') + sys.exit(1) + + +ret = {} +indir = sys.argv[1] +outfile = sys.argv[2] +for fname in os.listdir(indir): + with open(f'{indir}/{fname}', 'r') as fh: + d = json.load(fh) + ret[fname] = process(bytes.fromhex(d['code'][2:])) + +with open(outfile, 'w') as fh: + json.dump(ret, fh) diff --git a/benchmark/providers/whatsabi/Dockerfile b/benchmark/providers/whatsabi/Dockerfile new file mode 100644 index 0000000..1b54e4b --- /dev/null +++ b/benchmark/providers/whatsabi/Dockerfile @@ -0,0 +1,5 @@ +FROM node:21 +WORKDIR /app +RUN npm install @shazow/whatsabi@0.9.1 +COPY main.mjs /app +ENTRYPOINT ["node", "/app/main.mjs"] diff --git a/benchmark/providers/whatsabi/main.mjs b/benchmark/providers/whatsabi/main.mjs new file mode 100644 index 0000000..cd0e130 --- /dev/null +++ b/benchmark/providers/whatsabi/main.mjs @@ -0,0 +1,22 @@ +import {readdirSync, readFileSync, writeFileSync} from 'fs' + +import { whatsabi } from "@shazow/whatsabi"; + +const argv = process.argv; +if (argv.length != 4) { + console.log('Usage: node main.js INPUT_DIR OUTPUT_FILE') + process.exit(1) +} + +const indir = argv[2]; +const outfile = argv[3]; + +const res = Object.fromEntries( + readdirSync(indir).map( + file => [ + file, + whatsabi.selectorsFromBytecode(JSON.parse(readFileSync(`${indir}/${file}`))['code']).map(x => x.slice(2)) // remove '0x' prefix + ] + ) +); +writeFileSync(outfile, JSON.stringify(res), 'utf8'); diff --git a/benchmark/results/.gitkeep b/benchmark/results/.gitkeep new file mode 100644 index 0000000..e69de29 diff --git a/evmole/README.md b/evmole/README.md new file mode 100644 index 0000000..ff49744 --- /dev/null +++ b/evmole/README.md @@ -0,0 +1,3 @@ +# Python implementation + +See [examples/python.py](../examples/python.py) and [main README.md](../README.md#python) diff --git a/evmole/__init__.py b/evmole/__init__.py new file mode 100644 index 0000000..6a5da6c --- /dev/null +++ b/evmole/__init__.py @@ -0,0 +1 @@ +from .selectors import function_selectors diff --git a/evmole/evm/__init__.py b/evmole/evm/__init__.py new file mode 100644 index 0000000..e69de29 diff --git a/evmole/evm/memory.py b/evmole/evm/memory.py new file mode 100644 index 0000000..d749c27 --- /dev/null +++ b/evmole/evm/memory.py @@ -0,0 +1,36 @@ +class Memory: + def __init__(self): + self._data = [] + + def __str__(self): + r = f'{len(self._data)} elems:\n' + return r + '\n'.join(f' - {off}: {val.hex()} | {type(val)}' for off, val in self._data) + + def store(self, offset: int, value: bytes): + self._data.append((offset, value)) + + def load(self, offset: int) -> tuple[bytes, list[bytes]]: + self._data = sorted(self._data) + ret = b'' + used = [] + for off, val in self._data: + b = off + len(val) + if b <= offset: + continue + if offset + (32 - len(ret)) <= off: + break + + if off > offset: + ret += b'\x00' * (off - offset) + val + elif off < offset: + ret += val[offset - off :] + else: + ret += val + used.append(val) + offset += b + + if len(ret) > 32: + ret = ret[:32] + else: + ret += b'\x00' * max(0, 32 - len(ret)) + return ret, used diff --git a/evmole/evm/opcodes.py b/evmole/evm/opcodes.py new file mode 100644 index 0000000..7f341e2 --- /dev/null +++ b/evmole/evm/opcodes.py @@ -0,0 +1,172 @@ +from enum import Enum + + +class Op(int, Enum): + def __new__(cls, code, *args, **kwds): + obj = int.__new__(cls, code) + obj._value_ = code + return obj + + def __init__(self, code, stack_in=0, stack_out=0, blen=1, gas=None) -> None: + self.code = code + self.stack_in = stack_in + self.stack_out = stack_out + self.blen = blen + self.gas: int | None = gas + + STOP = (0x00, 0, 0, 1, 0) + ADD = (0x01, 2, 1, 1, 3) + MUL = (0x02, 2, 1, 1, 5) + SUB = (0x03, 2, 1, 1, 3) + DIV = (0x04, 2, 1, 1, 5) + SDIV = (0x05, 2, 1, 1, 5) + MOD = (0x06, 2, 1, 1, 5) + SMOD = (0x07, 2, 1, 1, 5) + ADDMOD = (0x08, 3, 1, 1, 8) + MULMOD = (0x09, 3, 1, 1, 8) + EXP = (0x0A, 2, 1, 1, None) + SIGNEXTEND = (0x0B, 2, 1, 1, 5) + + LT = (0x10, 2, 1, 1, 3) + GT = (0x11, 2, 1, 1, 3) + SLT = (0x12, 2, 1, 1, 3) + SGT = (0x13, 2, 1, 1, 3) + EQ = (0x14, 2, 1, 1, 3) + ISZERO = (0x15, 1, 1, 1, 3) + AND = (0x16, 2, 1, 1, 3) + OR = (0x17, 2, 1, 1, 3) + XOR = (0x18, 2, 1, 1, 3) + NOT = (0x19, 1, 1, 1, 3) + BYTE = (0x1A, 2, 1, 1, 3) + SHL = (0x1B, 2, 1, 1, 3) + SHR = (0x1C, 2, 1, 1, 3) + SAR = (0x1D, 2, 1, 1, 3) + + KECCAK256 = (0x20, 2, 1, 1, None) + + ADDRESS = (0x30, 0, 1, 1, 2) + BALANCE = (0x31, 1, 1, 1, None) + ORIGIN = (0x32, 0, 1, 1, 2) + CALLER = (0x33, 0, 1, 1, 2) + CALLVALUE = (0x34, 0, 1, 1, 2) + CALLDATALOAD = (0x35, 1, 1, 1, 3) + CALLDATASIZE = (0x36, 0, 1, 1, 2) + CALLDATACOPY = (0x37, 3, 0, 1, None) + CODESIZE = (0x38, 0, 1, 1, 2) + CODECOPY = (0x39, 3, 0, 1, None) + GASPRICE = (0x3A, 0, 1, 1, 2) + EXTCODESIZE = (0x3B, 1, 1, 1, None) + EXTCODECOPY = (0x3C, 4, 0, 1, None) + RETURNDATASIZE = (0x3D, 0, 1, 1, None) + RETURNDATACOPY = (0x3E, 3, 0, 1, None) + EXTCODEHASH = (0x3F, 1, 1, 1, None) + + BLOCKHASH = (0x40, 1, 1, 1, 20) + COINBASE = (0x41, 0, 1, 1, 2) + TIMESTAMP = (0x42, 0, 1, 1, 2) + NUMBER = (0x43, 0, 1, 1, 2) + DIFFICULTY = (0x44, 0, 1, 1, 2) + GASLIMIT = (0x45, 0, 1, 1, 2) + CHAINID = (0x46, 0, 1, 1, 2) + SELFBALANCE = (0x47, 0, 1, 1, 5) + BASEFEE = (0x48, 0, 1, 1, 2) + + POP = (0x50, 1, 0, 1, 2) + MLOAD = (0x51, 1, 1, 1, None) + MSTORE = (0x52, 2, 0, 1, None) + MSTORE8 = (0x53, 2, 0, 1, None) + SLOAD = (0x54, 1, 1, 1, None) + SSTORE = (0x55, 2, 0, 1, None) + JUMP = (0x56, 1, 0, 1, 8) + JUMPI = (0x57, 2, 0, 1, 10) + PC = (0x58, 0, 1, 1, 2) + MSIZE = (0x59, 0, 1, 1, 2) + GAS = (0x5A, 0, 1, 1, 2) + JUMPDEST = (0x5B, 0, 0, 1, 1) + PUSH0 = (0x5F, 0, 1, 1, 2) + + PUSH1 = (0x60, 0, 1, 2, 3) + PUSH2 = (0x61, 0, 1, 3, 3) + PUSH3 = (0x62, 0, 1, 4, 3) + PUSH4 = (0x63, 0, 1, 5, 3) + PUSH5 = (0x64, 0, 1, 6, 3) + PUSH6 = (0x65, 0, 1, 7, 3) + PUSH7 = (0x66, 0, 1, 8, 3) + PUSH8 = (0x67, 0, 1, 9, 3) + PUSH9 = (0x68, 0, 1, 10, 3) + PUSH10 = (0x69, 0, 1, 11, 3) + PUSH11 = (0x6A, 0, 1, 12, 3) + PUSH12 = (0x6B, 0, 1, 13, 3) + PUSH13 = (0x6C, 0, 1, 14, 3) + PUSH14 = (0x6D, 0, 1, 15, 3) + PUSH15 = (0x6E, 0, 1, 16, 3) + PUSH16 = (0x6F, 0, 1, 17, 3) + + PUSH17 = (0x70, 0, 1, 18, 3) + PUSH18 = (0x71, 0, 1, 19, 3) + PUSH19 = (0x72, 0, 1, 20, 3) + PUSH20 = (0x73, 0, 1, 21, 3) + PUSH21 = (0x74, 0, 1, 22, 3) + PUSH22 = (0x75, 0, 1, 23, 3) + PUSH23 = (0x76, 0, 1, 24, 3) + PUSH24 = (0x77, 0, 1, 25, 3) + PUSH25 = (0x78, 0, 1, 26, 3) + PUSH26 = (0x79, 0, 1, 27, 3) + PUSH27 = (0x7A, 0, 1, 28, 3) + PUSH28 = (0x7B, 0, 1, 29, 3) + PUSH29 = (0x7C, 0, 1, 30, 3) + PUSH30 = (0x7D, 0, 1, 31, 3) + PUSH31 = (0x7E, 0, 1, 32, 3) + PUSH32 = (0x7F, 0, 1, 33, 3) + + DUP1 = (0x80, 1, 2, 1, 3) + DUP2 = (0x81, 2, 3, 1, 3) + DUP3 = (0x82, 3, 4, 1, 3) + DUP4 = (0x83, 4, 5, 1, 3) + DUP5 = (0x84, 5, 6, 1, 3) + DUP6 = (0x85, 6, 7, 1, 3) + DUP7 = (0x86, 7, 8, 1, 3) + DUP8 = (0x87, 8, 9, 1, 3) + DUP9 = (0x88, 9, 10, 1, 3) + DUP10 = (0x89, 10, 11, 1, 3) + DUP11 = (0x8A, 11, 12, 1, 3) + DUP12 = (0x8B, 12, 13, 1, 3) + DUP13 = (0x8C, 13, 14, 1, 3) + DUP14 = (0x8D, 14, 15, 1, 3) + DUP15 = (0x8E, 15, 16, 1, 3) + DUP16 = (0x8F, 16, 17, 1, 3) + + SWAP1 = (0x90, 2, 2, 1, 3) + SWAP2 = (0x91, 3, 3, 1, 3) + SWAP3 = (0x92, 4, 4, 1, 3) + SWAP4 = (0x93, 5, 5, 1, 3) + SWAP5 = (0x94, 6, 6, 1, 3) + SWAP6 = (0x95, 7, 7, 1, 3) + SWAP7 = (0x96, 8, 8, 1, 3) + SWAP8 = (0x97, 9, 9, 1, 3) + SWAP9 = (0x98, 10, 10, 1, 3) + SWAP10 = (0x99, 11, 11, 1, 3) + SWAP11 = (0x9A, 12, 12, 1, 3) + SWAP12 = (0x9B, 13, 13, 1, 3) + SWAP13 = (0x9C, 14, 14, 1, 3) + SWAP14 = (0x9D, 15, 15, 1, 3) + SWAP15 = (0x9E, 16, 16, 1, 3) + SWAP16 = (0x9F, 17, 17, 1, 3) + + LOG0 = (0xA0, 2, 0, 1, None) + LOG1 = (0xA1, 3, 0, 1, None) + LOG2 = (0xA2, 4, 0, 1, None) + LOG3 = (0xA3, 5, 0, 1, None) + LOG4 = (0xA4, 6, 0, 1, None) + + CREATE = (0xF0, 3, 1, 1, None) + CALL = (0xF1, 7, 1, 1, None) + CALLCODE = (0xF2, 7, 1, 1, None) + RETURN = (0xF3, 2, 0, 1, None) + DELEGATECALL = (0xF4, 6, 1, 1, None) + CREATE2 = (0xF5, 4, 1, 1, None) + + STATICCALL = (0xFA, 6, 1, 1, None) + REVERT = (0xFD, 2, 0, 1, None) + INVALID = (0xFE, 0, 0, 1, None) + SELFDESTRUCT = (0xFF, 1, 0, 1, None) diff --git a/evmole/evm/stack.py b/evmole/evm/stack.py new file mode 100644 index 0000000..4b72cad --- /dev/null +++ b/evmole/evm/stack.py @@ -0,0 +1,31 @@ +class Stack: + def __init__(self): + self._data = [] + + def __str__(self): + r = f'{len(self._data)} elems:' + return r + ('\n' if len(self._data) else '') + '\n'.join(f' - {el.hex()} | {len(el)} | {type(el)}' for el in self._data) + + def push(self, val: bytes): + self._data.append(val) + + def pop(self) -> bytes: + return self._data.pop() + + def peek(self, n: int = 0) -> bytes | None: + if len(self._data) < n + 1: + return None + return self._data[-1 * (n + 1)] + + def dup(self, n: int): + self.push(self._data[-n]) + + def swap(self, n: int): + self._data[-1], self._data[-n - 1] = self._data[-n - 1], self._data[-1] + + def push_uint(self, val: int): + bl = val.bit_length() if val != 0 else 1 + self.push(val.to_bytes(bl, byteorder='big', signed=False)) + + def pop_uint(self) -> int: + return int.from_bytes(self.pop(), 'big', signed=False) diff --git a/evmole/evm/vm.py b/evmole/evm/vm.py new file mode 100644 index 0000000..65e0030 --- /dev/null +++ b/evmole/evm/vm.py @@ -0,0 +1,169 @@ +from typing import Any + +from .opcodes import Op +from .stack import Stack +from .memory import Memory + +E256 = 2**256 +E256M1 = E256 - 1 + + +class Vm: + def __init__(self, *, code: bytes, calldata): + self.code = code + self.pc = 0 + self.stack = Stack() + self.memory = Memory() + self.stopped = False + self.calldata = calldata + + def __str__(self): + return '\n'.join( + ( + f'Vm ({id(self):x}):', + f' .pc = {self.pc} | {self.current_op()}', + f' .stack = {self.stack}', + f' .memory = {self.memory}', + ) + ) + + def __copy__(self): + obj = Vm(code=self.code, calldata=self.calldata) + obj.pc = self.pc + obj.memory._data = self.memory._data[:] + obj.stack._data = self.stack._data[:] + obj.stopped = self.stopped + return obj + + def current_op(self) -> Op: + return Op(self.code[self.pc]) + + def step(self) -> tuple[Op, int, *tuple[Any, ...]]: + ret = self._exec_next_opcode() + op, gas_used = ret[0], ret[1] + assert gas_used != -1, f'Op {op} with unset gas_used' + + if op not in {Op.JUMP, Op.JUMPI}: + self.pc += op.blen + + if self.pc >= len(self.code): + self.stopped = True + return ret + + def _exec_next_opcode(self) -> tuple[Op, int, *tuple[Any, ...]]: + op = self.current_op() + gas_used = op.gas if op.gas is not None else -1 + match op: + case op if op >= Op.PUSH0 and op <= Op.PUSH32: + n = op - Op.PUSH0 + args = self.code[(self.pc + 1) : (self.pc + 1 + n)] if n != 0 else b'\x00' + self.stack.push(args) + return (op, gas_used) + + case op if op in {Op.JUMP, Op.JUMPI}: + s0 = self.stack.pop_uint() + assert self.code[s0] == Op.JUMPDEST.code, 'not JUMPDEST, pos %d op %02x' % (s0, self.code[s0]) + if op == Op.JUMPI: + s1 = self.stack.pop_uint() + if s1 == 0: + self.pc += 1 + return (op, gas_used) + self.pc = s0 + return (op, gas_used) + + case op if op >= Op.DUP1 and op <= Op.DUP16: + self.stack.dup(op - Op.DUP1 + 1) + return (op, gas_used) + + case Op.JUMPDEST: + return (op, gas_used) + + case Op.REVERT: + self.stack.pop() + self.stack.pop() + self.stopped = True + return (op, 4) + + case Op.ISZERO: + raws0 = self.stack.pop() + s0 = int.from_bytes(raws0, 'big', signed=False) + res = 0 if s0 else 1 + self.stack.push_uint(res) + return (op, gas_used, raws0) + + case Op.POP: + self.stack.pop() + return (op, gas_used) + + case op if op in {Op.LT, Op.GT, Op.EQ, Op.SUB, Op.DIV, Op.EXP, Op.XOR, Op.AND, Op.SHR}: + raws0 = self.stack.pop() + raws1 = self.stack.pop() + + s0 = int.from_bytes(raws0, 'big', signed=False) + s1 = int.from_bytes(raws1, 'big', signed=False) + + match op: + case Op.EQ: + res = 1 if s0 == s1 else 0 + case Op.GT: + res = 1 if s0 > s1 else 0 + case Op.LT: + res = 1 if s0 < s1 else 0 + case Op.SUB: + res = (s0 - s1) & E256M1 + case Op.DIV: + res = 0 if s1 == 0 else s0 // s1 + case Op.EXP: + res = pow(s0, s1, E256) + gas_used = 50 * (1 + (s1.bit_length() // 8)) # ~approx + case Op.XOR: + res = s0 ^ s1 + case Op.AND: + res = s0 & s1 + case Op.SHR: + res = 0 if s0 >= 256 else (s1 >> s0) & E256M1 + case _: + raise Exception(f'BUG: op {op} not handled in match') + + self.stack.push_uint(res) + return (op, gas_used, raws0, raws1) + + case Op.CALLVALUE: + self.stack.push_uint(0) # msg.value == 0 + return (op, gas_used) + + case Op.CALLDATALOAD: + offset = self.stack.pop_uint() + self.stack.push(self.calldata.load(offset)) + return (op, gas_used) + + case Op.CALLDATASIZE: + self.stack.push_uint(len(self.calldata)) + return (op, gas_used) + + case op if op >= Op.SWAP1 and op <= Op.SWAP16: + self.stack.swap(op - Op.SWAP1 + 1) + return (op, gas_used) + + case Op.MSTORE: + offset = self.stack.pop_uint() + value = self.stack.pop() + self.memory.store(offset, value) + return (op, 3) + + case Op.MLOAD: + offset = self.stack.pop_uint() + val, used = self.memory.load(offset) + self.stack.push(val) + return (op, 4, used) + + case Op.CALLDATACOPY: + mem_off = self.stack.pop_uint() + src_off = self.stack.pop_uint() + size = self.stack.pop_uint() + value = self.calldata.load(src_off, size) + self.memory.store(mem_off, value) + return (op, 4) + + case _: + raise Exception(f'unknown op {op}') diff --git a/evmole/selectors.py b/evmole/selectors.py new file mode 100644 index 0000000..0a9a4cc --- /dev/null +++ b/evmole/selectors.py @@ -0,0 +1,92 @@ +import copy + +from .evm.vm import Vm +from .evm.opcodes import Op + + +class CallData(bytes): + def load(self, offset: int, size: int = 32): + val = self[offset : min(offset + size, len(self))] + return CallData(val + b'\x00' * max(0, size - len(val))) + + +class CallDataSignature(bytes): + pass + + +def process(vm: Vm, gas_limit: int) -> tuple[list[bytes], int]: + selectors = [] + gas_used = 0 + while not vm.stopped: + # print(vm, '\n') + try: + ret = vm.step() + gas_used += ret[1] + if gas_used > gas_limit: + raise Exception(f'gas overflow: {gas_used} > {gas_limit}') + except Exception as ex: + _ = ex + # raise ex + break + + match ret: + # fmt: off + case ((Op.XOR | Op.EQ as op, _, bytes() as s1, CallDataSignature())) | \ + ((Op.XOR | Op.EQ as op, _, CallDataSignature(), bytes() as s1) + ): + #fmt: on + selectors.append(s1[-4:]) + vm.stack.pop() + vm.stack.push_uint(1 if op == Op.XOR else 0) + + # fmt: off + case (Op.SUB, _, CallDataSignature(), bytes() as s1) | \ + (Op.SUB, _, bytes() as s1, CallDataSignature() + ): + #fmt: on + selectors.append(s1[-4:]) + + case (Op.LT | Op.GT, *_): + cloned_vm = copy.copy(vm) + s, g = process(cloned_vm, gas_limit // 2) + selectors += s + gas_used += g + v = vm.stack.pop_uint() + vm.stack.push_uint(1 if v == 0 else 0) + + # fmt: off + case (Op.SHR, _, _, CallDataSignature() | CallData()) | \ + (Op.AND, _, CallDataSignature() | CallData(), _) | \ + (Op.AND, _, _, CallDataSignature() | CallData()) | \ + (Op.DIV, _, CallDataSignature() | CallData(), _ + ): + # fmt: on + v = vm.stack.peek() + assert v is not None + if v[-4:] == vm.calldata[:4]: + v = vm.stack.pop() + vm.stack.push(CallDataSignature(v)) + + case (Op.ISZERO, _, CallDataSignature()): + selectors.append(b'\x00\x00\x00\x00') + + case (Op.MLOAD, _, list() as used): + for u in used: + if isinstance(u, CallData): + p = vm.stack.peek() + if p is not None and p[-4:] == vm.calldata[:4]: + v = vm.stack.pop() + vm.stack.push(CallDataSignature(v)) + break + + return selectors, gas_used + + +def function_selectors(code: bytes|str, gas_limit: int = int(1e6)) -> list[str]: + if isinstance(code, str): + code = bytes.fromhex(code[2:] if code.startswith('0x') else code) + else: + assert isinstance(code, bytes), '`code` arg must be hex-string or bytes' + vm = Vm(code=code, calldata=CallData(b'\xaa\xbb\xcc\xdd')) + selectors, _ = process(vm, gas_limit) + return [s.hex().zfill(8) for s in selectors] diff --git a/examples/example.sol b/examples/example.sol new file mode 100644 index 0000000..49f3fad --- /dev/null +++ b/examples/example.sol @@ -0,0 +1,10 @@ +// SPDX-License-Identifier: MIT +pragma solidity ^0.8.23; + +contract Example { + uint256 public balance; + + function deposit() public payable { + balance += msg.value; + } +} diff --git a/examples/javascript.mjs b/examples/javascript.mjs new file mode 100644 index 0000000..d66583e --- /dev/null +++ b/examples/javascript.mjs @@ -0,0 +1,14 @@ +import {functionSelectors} from 'evmole' + +// output of `solc example.sol --bin-runtime --optimize` +const code = '0x6080604052600436106025575f3560e01c8063b69ef8a8146029578063d0e30db014604d575b5f80fd5b3480156033575f80fd5b50603b5f5481565b60405190815260200160405180910390f35b60536055565b005b345f8082825460639190606a565b9091555050565b80820180821115608857634e487b7160e01b5f52601160045260245ffd5b9291505056fea2646970667358221220354240f63068d555e9b817619001b0dff6ea630d137edc1a640dae8e3ebb959864736f6c63430008170033' + +let r; +r = functionSelectors(code) +console.log('all signatures with default gas_limit', r) + +r = functionSelectors(code, 100) +console.log('only 1 signature found with so low gas limit', r) + +r = functionSelectors(code, 200) +console.log('200 gas is enough for all 2 signatures', r) diff --git a/examples/python.py b/examples/python.py new file mode 100644 index 0000000..e0e52a5 --- /dev/null +++ b/examples/python.py @@ -0,0 +1,13 @@ +from evmole import function_selectors + +# output of `solc example.sol --bin-runtime --optimize` +code = '0x6080604052600436106025575f3560e01c8063b69ef8a8146029578063d0e30db014604d575b5f80fd5b3480156033575f80fd5b50603b5f5481565b60405190815260200160405180910390f35b60536055565b005b345f8082825460639190606a565b9091555050565b80820180821115608857634e487b7160e01b5f52601160045260245ffd5b9291505056fea2646970667358221220354240f63068d555e9b817619001b0dff6ea630d137edc1a640dae8e3ebb959864736f6c63430008170033' + +r = function_selectors(code) +print('all signatures with default gas_limit', r) + +r = function_selectors(code, gas_limit=100) +print('only 1 signature found with so low gas limit', r) + +r = function_selectors(code, gas_limit=200) +print('200 gas is enough for all 2 signatures', r) diff --git a/js/.eslintrc.cjs b/js/.eslintrc.cjs new file mode 100644 index 0000000..9a8e93f --- /dev/null +++ b/js/.eslintrc.cjs @@ -0,0 +1,27 @@ +module.exports = { + "env": { + "browser": true, + "es2021": true, + "node": true + }, + "extends": "eslint:recommended", + "overrides": [ + { + "env": { + "node": true + }, + "files": [ + ".eslintrc.{js,cjs}" + ], + "parserOptions": { + "sourceType": "script" + } + } + ], + "parserOptions": { + "ecmaVersion": "latest", + "sourceType": "module" + }, + "rules": { + } +} diff --git a/js/.prettierrc b/js/.prettierrc new file mode 100644 index 0000000..e63fa60 --- /dev/null +++ b/js/.prettierrc @@ -0,0 +1,5 @@ +{ + "trailingComma": "all", + "semi": false, + "singleQuote": true +} diff --git a/js/README.md b/js/README.md new file mode 100644 index 0000000..7e624f0 --- /dev/null +++ b/js/README.md @@ -0,0 +1,3 @@ +# JavaScript implementation + +See [examples/javascript.mjs](../examples/javascript.mjs) and [main README.md](../README.md#javascript) diff --git a/js/package-lock.json b/js/package-lock.json new file mode 100644 index 0000000..4b43f98 --- /dev/null +++ b/js/package-lock.json @@ -0,0 +1,1541 @@ +{ + "name": "evmole", + "version": "0.0.1", + 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+ "scripts": { + "build-cjs": "npx esbuild ./src/ --bundle --minify --sourcemap --format=cjs --outfile=dist/index.cjs.js", + "build-esm": "npx esbuild ./src/ --bundle --minify --sourcemap --format=esm --outfile=dist/index.esm.js", + "build": "rm -rf dist/ && npm run build-cjs && npm run build-esm && cp ./src/index.d.ts dist/", + "lint": "npx eslint ./src/", + "format": "npx prettier ./src/ --write" + }, + "author": "Maxim Andreev ", + "license": "MIT", + "homepage": "https://github.com/cdump/evmole", + "repository": "github:cdump/evmole", + "files": [ + "dist", + "README.md" + ], + "devDependencies": { + "esbuild": "0.19.6", + "eslint": "^8.53.0", + "prettier": "3.1.0" + } +} diff --git a/js/src/evm/memory.js b/js/src/evm/memory.js new file mode 100644 index 0000000..e4c4af5 --- /dev/null +++ b/js/src/evm/memory.js @@ -0,0 +1,53 @@ +export default class Memory { + constructor() { + this._data = [] + } + + toString() { + let r = `${this._data.length} elems:\n` + for (const el of this._data) { + r += ` - ${el.toString(16)} | ${typeof el}\n` + } + return r + } + + store(offset, value) { + this._data.push([offset, value]) + } + + load(offset) { + this._data = this._data.sort((a, b) => a[0] - b[0]) + let ret = [] + let used = [] + + for (const [off, val] of this._data) { + const b = off + val.length + if (b <= offset) { + continue + } + if (offset + (32 - ret.length) <= off) { + break + } + + if (off > offset) { + ret.push(...new Array(off - offset).fill(0)) + ret.push(...val) + } else if (off < offset) { + ret.push(...val.subarray(offset - off)) + } else { + ret.push(...val) + } + + used.push(val) + offset += b + } + + if (ret.length > 32) { + ret = ret.slice(0, 32) + } else { + ret.push(...new Array(32 - ret.length).fill(0)) + } + + return [new Uint8Array(ret), used] + } +} diff --git a/js/src/evm/opcodes.js b/js/src/evm/opcodes.js new file mode 100644 index 0000000..c74ef25 --- /dev/null +++ b/js/src/evm/opcodes.js @@ -0,0 +1,333 @@ +export default class Op { + constructor( + code, + name = '', + stack_in = 0, + stack_out = 0, + blen = 1, + gas = undefined, + ) { + this.code = code + this.name = name + this.stack_in = stack_in + this.stack_out = stack_out + this.blen = blen + this.gas = gas + } + + valueOf() { + return this.code + } + + static parse(code) { + const op = this.#ops[code] + if (op === undefined) throw `Unknown op code ${code}` + return op + } + + static STOP = new Op(0x00, 'STOP', 0, 0, 1, 0) + static ADD = new Op(0x01, 'ADD', 2, 1, 1, 3) + static MUL = new Op(0x02, 'MUL', 2, 1, 1, 5) + static SUB = new Op(0x03, 'SUB', 2, 1, 1, 3) + static DIV = new Op(0x04, 'DIV', 2, 1, 1, 5) + static SDIV = new Op(0x05, 'SDIV', 2, 1, 1, 5) + static MOD = new Op(0x06, 'MOD', 2, 1, 1, 5) + static SMOD = new Op(0x07, 'SMOD', 2, 1, 1, 5) + static ADDMOD = new Op(0x08, 'ADDMOD', 3, 1, 1, 8) + static MULMOD = new Op(0x09, 'MULMOD', 3, 1, 1, 8) + static EXP = new Op(0x0a, 'EXP', 2, 1, 1, undefined) + static SIGNEXTEND = new Op(0x0b, 'SIGNEXTEND', 2, 1, 1, 5) + + static LT = new Op(0x10, 'LT', 2, 1, 1, 3) + static GT = new Op(0x11, 'GT', 2, 1, 1, 3) + static SLT = new Op(0x12, 'SLT', 2, 1, 1, 3) + static SGT = new Op(0x13, 'SGT', 2, 1, 1, 3) + static EQ = new Op(0x14, 'EQ', 2, 1, 1, 3) + static ISZERO = new Op(0x15, 'ISZERO', 1, 1, 1, 3) + static AND = new Op(0x16, 'AND', 2, 1, 1, 3) + static OR = new Op(0x17, 'OR', 2, 1, 1, 3) + static XOR = new Op(0x18, 'XOR', 2, 1, 1, 3) + static NOT = new Op(0x19, 'NOT', 1, 1, 1, 3) + static BYTE = new Op(0x1a, 'BYTE', 2, 1, 1, 3) + static SHL = new Op(0x1b, 'SHL', 2, 1, 1, 3) + static SHR = new Op(0x1c, 'SHR', 2, 1, 1, 3) + static SAR = new Op(0x1d, 'SAR', 2, 1, 1, 3) + + static KECCAK256 = new Op(0x20, 'KECCAK256', 2, 1, 1, undefined) + + static ADDRESS = new Op(0x30, 'ADDRESS', 0, 1, 1, 2) + static BALANCE = new Op(0x31, 'BALANCE', 1, 1, 1, undefined) + static ORIGIN = new Op(0x32, 'ORIGIN', 0, 1, 1, 2) + static CALLER = new Op(0x33, 'CALLER', 0, 1, 1, 2) + static CALLVALUE = new Op(0x34, 'CALLVALUE', 0, 1, 1, 2) + static CALLDATALOAD = new Op(0x35, 'CALLDATALOAD', 1, 1, 1, 3) + static CALLDATASIZE = new Op(0x36, 'CALLDATASIZE', 0, 1, 1, 2) + static CALLDATACOPY = new Op(0x37, 'CALLDATACOPY', 3, 0, 1, undefined) + static CODESIZE = new Op(0x38, 'CODESIZE', 0, 1, 1, 2) + static CODECOPY = new Op(0x39, 'CODECOPY', 3, 0, 1, undefined) + static GASPRICE = new Op(0x3a, 'GASPRICE', 0, 1, 1, 2) + static EXTCODESIZE = new Op(0x3b, 'EXTCODESIZE', 1, 1, 1, undefined) + static EXTCODECOPY = new Op(0x3c, 'EXTCODECOPY', 4, 0, 1, undefined) + static RETURNDATASIZE = new Op(0x3d, 'RETURNDATASIZE', 0, 1, 1, undefined) + static RETURNDATACOPY = new Op(0x3e, 'RETURNDATACOPY', 3, 0, 1, undefined) + static EXTCODEHASH = new Op(0x3f, 'EXTCODEHASH', 1, 1, 1, undefined) + + static BLOCKHASH = new Op(0x40, 'BLOCKHASH', 1, 1, 1, 20) + static COINBASE = new Op(0x41, 'COINBASE', 0, 1, 1, 2) + static TIMESTAMP = new Op(0x42, 'TIMESTAMP', 0, 1, 1, 2) + static NUMBER = new Op(0x43, 'NUMBER', 0, 1, 1, 2) + static DIFFICULTY = new Op(0x44, 'DIFFICULTY', 0, 1, 1, 2) + static GASLIMIT = new Op(0x45, 'GASLIMIT', 0, 1, 1, 2) + static CHAINID = new Op(0x46, 'CHAINID', 0, 1, 1, 2) + static SELFBALANCE = new Op(0x47, 'SELFBALANCE', 0, 1, 1, 5) + static BASEFEE = new Op(0x48, 'BASEFEE', 0, 1, 1, 2) + + static POP = new Op(0x50, 'POP', 1, 0, 1, 2) + static MLOAD = new Op(0x51, 'MLOAD', 1, 1, 1, undefined) + static MSTORE = new Op(0x52, 'MSTORE', 2, 0, 1, undefined) + static MSTORE8 = new Op(0x53, 'MSTORE8', 2, 0, 1, undefined) + static SLOAD = new Op(0x54, 'SLOAD', 1, 1, 1, undefined) + static SSTORE = new Op(0x55, 'SSTORE', 2, 0, 1, undefined) + static JUMP = new Op(0x56, 'JUMP', 1, 0, 1, 8) + static JUMPI = new Op(0x57, 'JUMPI', 2, 0, 1, 10) + static PC = new Op(0x58, 'PC', 0, 1, 1, 2) + static MSIZE = new Op(0x59, 'MSIZE', 0, 1, 1, 2) + static GAS = new Op(0x5a, 'GAS', 0, 1, 1, 2) + static JUMPDEST = new Op(0x5b, 'JUMPDEST', 0, 0, 1, 1) + static PUSH0 = new Op(0x5f, 'PUSH0', 0, 1, 1, 2) + + static PUSH1 = new Op(0x60, 'PUSH1', 0, 1, 2, 3) + static PUSH2 = new Op(0x61, 'PUSH2', 0, 1, 3, 3) + static PUSH3 = new Op(0x62, 'PUSH3', 0, 1, 4, 3) + static PUSH4 = new Op(0x63, 'PUSH4', 0, 1, 5, 3) + static PUSH5 = new Op(0x64, 'PUSH5', 0, 1, 6, 3) + static PUSH6 = new Op(0x65, 'PUSH6', 0, 1, 7, 3) + static PUSH7 = new Op(0x66, 'PUSH7', 0, 1, 8, 3) + static PUSH8 = new Op(0x67, 'PUSH8', 0, 1, 9, 3) + static PUSH9 = new Op(0x68, 'PUSH9', 0, 1, 10, 3) + static PUSH10 = new Op(0x69, 'PUSH10', 0, 1, 11, 3) + static PUSH11 = new Op(0x6a, 'PUSH11', 0, 1, 12, 3) + static PUSH12 = new Op(0x6b, 'PUSH12', 0, 1, 13, 3) + static PUSH13 = new Op(0x6c, 'PUSH13', 0, 1, 14, 3) + static PUSH14 = new Op(0x6d, 'PUSH14', 0, 1, 15, 3) + static PUSH15 = new Op(0x6e, 'PUSH15', 0, 1, 16, 3) + static PUSH16 = new Op(0x6f, 'PUSH16', 0, 1, 17, 3) + + static PUSH17 = new Op(0x70, 'PUSH17', 0, 1, 18, 3) + static PUSH18 = new Op(0x71, 'PUSH18', 0, 1, 19, 3) + static PUSH19 = new Op(0x72, 'PUSH19', 0, 1, 20, 3) + static PUSH20 = new Op(0x73, 'PUSH20', 0, 1, 21, 3) + static PUSH21 = new Op(0x74, 'PUSH21', 0, 1, 22, 3) + static PUSH22 = new Op(0x75, 'PUSH22', 0, 1, 23, 3) + static PUSH23 = new Op(0x76, 'PUSH23', 0, 1, 24, 3) + static PUSH24 = new Op(0x77, 'PUSH24', 0, 1, 25, 3) + static PUSH25 = new Op(0x78, 'PUSH25', 0, 1, 26, 3) + static PUSH26 = new Op(0x79, 'PUSH26', 0, 1, 27, 3) + static PUSH27 = new Op(0x7a, 'PUSH27', 0, 1, 28, 3) + static PUSH28 = new Op(0x7b, 'PUSH28', 0, 1, 29, 3) + static PUSH29 = new Op(0x7c, 'PUSH29', 0, 1, 30, 3) + static PUSH30 = new Op(0x7d, 'PUSH30', 0, 1, 31, 3) + static PUSH31 = new Op(0x7e, 'PUSH31', 0, 1, 32, 3) + static PUSH32 = new Op(0x7f, 'PUSH32', 0, 1, 33, 3) + + static DUP1 = new Op(0x80, 'DUP1', 1, 2, 1, 3) + static DUP2 = new Op(0x81, 'DUP2', 2, 3, 1, 3) + static DUP3 = new Op(0x82, 'DUP3', 3, 4, 1, 3) + static DUP4 = new Op(0x83, 'DUP4', 4, 5, 1, 3) + static DUP5 = new Op(0x84, 'DUP5', 5, 6, 1, 3) + static DUP6 = new Op(0x85, 'DUP6', 6, 7, 1, 3) + static DUP7 = new Op(0x86, 'DUP7', 7, 8, 1, 3) + static DUP8 = new Op(0x87, 'DUP8', 8, 9, 1, 3) + static DUP9 = new Op(0x88, 'DUP9', 9, 10, 1, 3) + static DUP10 = new Op(0x89, 'DUP10', 10, 11, 1, 3) + static DUP11 = new Op(0x8a, 'DUP11', 11, 12, 1, 3) + static DUP12 = new Op(0x8b, 'DUP12', 12, 13, 1, 3) + static DUP13 = new Op(0x8c, 'DUP13', 13, 14, 1, 3) + static DUP14 = new Op(0x8d, 'DUP14', 14, 15, 1, 3) + static DUP15 = new Op(0x8e, 'DUP15', 15, 16, 1, 3) + static DUP16 = new Op(0x8f, 'DUP16', 16, 17, 1, 3) + + static SWAP1 = new Op(0x90, 'SWAP1', 2, 2, 1, 3) + static SWAP2 = new Op(0x91, 'SWAP2', 3, 3, 1, 3) + static SWAP3 = new Op(0x92, 'SWAP3', 4, 4, 1, 3) + static SWAP4 = new Op(0x93, 'SWAP4', 5, 5, 1, 3) + static SWAP5 = new Op(0x94, 'SWAP5', 6, 6, 1, 3) + static SWAP6 = new Op(0x95, 'SWAP6', 7, 7, 1, 3) + static SWAP7 = new Op(0x96, 'SWAP7', 8, 8, 1, 3) + static SWAP8 = new Op(0x97, 'SWAP8', 9, 9, 1, 3) + static SWAP9 = new Op(0x98, 'SWAP9', 10, 10, 1, 3) + static SWAP10 = new Op(0x99, 'SWAP10', 11, 11, 1, 3) + static SWAP11 = new Op(0x9a, 'SWAP11', 12, 12, 1, 3) + static SWAP12 = new Op(0x9b, 'SWAP12', 13, 13, 1, 3) + static SWAP13 = new Op(0x9c, 'SWAP13', 14, 14, 1, 3) + static SWAP14 = new Op(0x9d, 'SWAP14', 15, 15, 1, 3) + static SWAP15 = new Op(0x9e, 'SWAP15', 16, 16, 1, 3) + static SWAP16 = new Op(0x9f, 'SWAP16', 17, 17, 1, 3) + + static LOG0 = new Op(0xa0, 'LOG0', 2, 0, 1, undefined) + static LOG1 = new Op(0xa1, 'LOG1', 3, 0, 1, undefined) + static LOG2 = new Op(0xa2, 'LOG2', 4, 0, 1, undefined) + static LOG3 = new Op(0xa3, 'LOG3', 5, 0, 1, undefined) + static LOG4 = new Op(0xa4, 'LOG4', 6, 0, 1, undefined) + + static CREATE = new Op(0xf0, 'CREATE', 3, 1, 1, undefined) + static CALL = new Op(0xf1, 'CALL', 7, 1, 1, undefined) + static CALLCODE = new Op(0xf2, 'CALLCODE', 7, 1, 1, undefined) + static RETURN = new Op(0xf3, 'RETURN', 2, 0, 1, undefined) + static DELEGATECALL = new Op(0xf4, 'DELEGATECALL', 6, 1, 1, undefined) + static CREATE2 = new Op(0xf5, 'CREATE2', 4, 1, 1, undefined) + + static STATICCALL = new Op(0xfa, 'STATICCALL', 6, 1, 1, undefined) + static REVERT = new Op(0xfd, 'REVERT', 2, 0, 1, undefined) + static INVALID = new Op(0xfe, 'INVALID', 0, 0, 1, undefined) + static SELFDESTRUCT = new Op(0xff, 'SELFDESTRUCT', 1, 0, 1, undefined) + + static #ops = Array(256) + static { + const o = this.#ops + o[0x00] = Op.STOP + o[0x01] = Op.ADD + o[0x02] = Op.MUL + o[0x03] = Op.SUB + o[0x04] = Op.DIV + o[0x05] = Op.SDIV + o[0x06] = Op.MOD + o[0x07] = Op.SMOD + o[0x08] = Op.ADDMOD + o[0x09] = Op.MULMOD + o[0x0a] = Op.EXP + o[0x0b] = Op.SIGNEXTEND + o[0x10] = Op.LT + o[0x11] = Op.GT + o[0x12] = Op.SLT + o[0x13] = Op.SGT + o[0x14] = Op.EQ + o[0x15] = Op.ISZERO + o[0x16] = Op.AND + o[0x17] = Op.OR + o[0x18] = Op.XOR + o[0x19] = Op.NOT + o[0x1a] = Op.BYTE + o[0x1b] = Op.SHL + o[0x1c] = Op.SHR + o[0x1d] = Op.SAR + o[0x20] = Op.KECCAK256 + o[0x30] = Op.ADDRESS + o[0x31] = Op.BALANCE + o[0x32] = Op.ORIGIN + o[0x33] = Op.CALLER + o[0x34] = Op.CALLVALUE + o[0x35] = Op.CALLDATALOAD + o[0x36] = Op.CALLDATASIZE + o[0x37] = Op.CALLDATACOPY + o[0x38] = Op.CODESIZE + o[0x39] = Op.CODECOPY + o[0x3a] = Op.GASPRICE + o[0x3b] = Op.EXTCODESIZE + o[0x3c] = Op.EXTCODECOPY + o[0x3d] = Op.RETURNDATASIZE + o[0x3e] = Op.RETURNDATACOPY + o[0x3f] = Op.EXTCODEHASH + o[0x40] = Op.BLOCKHASH + o[0x41] = Op.COINBASE + o[0x42] = Op.TIMESTAMP + o[0x43] = Op.NUMBER + o[0x44] = Op.DIFFICULTY + o[0x45] = Op.GASLIMIT + o[0x46] = Op.CHAINID + o[0x47] = Op.SELFBALANCE + o[0x48] = Op.BASEFEE + o[0x50] = Op.POP + o[0x51] = Op.MLOAD + o[0x52] = Op.MSTORE + o[0x53] = Op.MSTORE8 + o[0x54] = Op.SLOAD + o[0x55] = Op.SSTORE + o[0x56] = Op.JUMP + o[0x57] = Op.JUMPI + o[0x58] = Op.PC + o[0x59] = Op.MSIZE + o[0x5a] = Op.GAS + o[0x5b] = Op.JUMPDEST + o[0x5f] = Op.PUSH0 + o[0x60] = Op.PUSH1 + o[0x61] = Op.PUSH2 + o[0x62] = Op.PUSH3 + o[0x63] = Op.PUSH4 + o[0x64] = Op.PUSH5 + o[0x65] = Op.PUSH6 + o[0x66] = Op.PUSH7 + o[0x67] = Op.PUSH8 + o[0x68] = Op.PUSH9 + o[0x69] = Op.PUSH10 + o[0x6a] = Op.PUSH11 + o[0x6b] = Op.PUSH12 + o[0x6c] = Op.PUSH13 + o[0x6d] = Op.PUSH14 + o[0x6e] = Op.PUSH15 + o[0x6f] = Op.PUSH16 + o[0x70] = Op.PUSH17 + o[0x71] = Op.PUSH18 + o[0x72] = Op.PUSH19 + o[0x73] = Op.PUSH20 + o[0x74] = Op.PUSH21 + o[0x75] = Op.PUSH22 + o[0x76] = Op.PUSH23 + o[0x77] = Op.PUSH24 + o[0x78] = Op.PUSH25 + o[0x79] = Op.PUSH26 + o[0x7a] = Op.PUSH27 + o[0x7b] = Op.PUSH28 + o[0x7c] = Op.PUSH29 + o[0x7d] = Op.PUSH30 + o[0x7e] = Op.PUSH31 + o[0x7f] = Op.PUSH32 + o[0x80] = Op.DUP1 + o[0x81] = Op.DUP2 + o[0x82] = Op.DUP3 + o[0x83] = Op.DUP4 + o[0x84] = Op.DUP5 + o[0x85] = Op.DUP6 + o[0x86] = Op.DUP7 + o[0x87] = Op.DUP8 + o[0x88] = Op.DUP9 + o[0x89] = Op.DUP10 + o[0x8a] = Op.DUP11 + o[0x8b] = Op.DUP12 + o[0x8c] = Op.DUP13 + o[0x8d] = Op.DUP14 + o[0x8e] = Op.DUP15 + o[0x8f] = Op.DUP16 + o[0x90] = Op.SWAP1 + o[0x91] = Op.SWAP2 + o[0x92] = Op.SWAP3 + o[0x93] = Op.SWAP4 + o[0x94] = Op.SWAP5 + o[0x95] = Op.SWAP6 + o[0x96] = Op.SWAP7 + o[0x97] = Op.SWAP8 + o[0x98] = Op.SWAP9 + o[0x99] = Op.SWAP10 + o[0x9a] = Op.SWAP11 + o[0x9b] = Op.SWAP12 + o[0x9c] = Op.SWAP13 + o[0x9d] = Op.SWAP14 + o[0x9e] = Op.SWAP15 + o[0x9f] = Op.SWAP16 + o[0xa0] = Op.LOG0 + o[0xa1] = Op.LOG1 + o[0xa2] = Op.LOG2 + o[0xa3] = Op.LOG3 + o[0xa4] = Op.LOG4 + o[0xf0] = Op.CREATE + o[0xf1] = Op.CALL + o[0xf2] = Op.CALLCODE + o[0xf3] = Op.RETURN + o[0xf4] = Op.DELEGATECALL + o[0xf5] = Op.CREATE2 + o[0xfa] = Op.STATICCALL + o[0xfd] = Op.REVERT + o[0xfe] = Op.INVALID + o[0xff] = Op.SELFDESTRUCT + } +} diff --git a/js/src/evm/stack.js b/js/src/evm/stack.js new file mode 100644 index 0000000..d8afdac --- /dev/null +++ b/js/src/evm/stack.js @@ -0,0 +1,38 @@ +export default class Stack { + constructor() { + this._data = [] + } + + toString() { + let r = `${this._data.length} elems:\n` + for (const el of this._data) { + r += ` - ${el.toString(16)} | ${typeof el}\n` + } + return r + } + + push(val) { + this._data.push(val) + } + + pop() { + return this._data.pop() + } + + peek(idx = 0) { + if (this._data.length < idx + 1) { + return undefined + } + return this._data[this._data.length - idx - 1] + } + + dup(n) { + this._data.push(this._data[this._data.length - n]) + } + + swap(n) { + const tmp = this._data[this._data.length - n - 1] + this._data[this._data.length - n - 1] = this._data[this._data.length - 1] + this._data[this._data.length - 1] = tmp + } +} diff --git a/js/src/evm/vm.js b/js/src/evm/vm.js new file mode 100644 index 0000000..f01c3fd --- /dev/null +++ b/js/src/evm/vm.js @@ -0,0 +1,223 @@ +import Op from './opcodes.js' +import Stack from './stack.js' +import Memory from './memory.js' +import { uint8ArrayToBigInt, hexToUint8Array, modExp } from '../utils.js' + +const E256 = 2n ** 256n +const E256M1 = E256 - 1n + +function toBigInt(v) { + if (typeof v === 'bigint') return v + if (typeof v.toBigInt === 'function') return v.toBigInt() + if (!(v instanceof Uint8Array)) throw `Not uint8array instance` + return uint8ArrayToBigInt(v) +} + +export default class Vm { + constructor(code, calldata, clone = false) { + if (clone) { + return + } + this.code = code + this.pc = 0 + this.stack = new Stack() + this.memory = new Memory() + this.stopped = false + this.calldata = calldata + } + + toString() { + let r = 'Vm:\n' + r += ` .pc = 0x${this.pc.toString(16)} | ${this.current_op().name}\n` + r += ` .stack = ${this.stack}\n` + return r + } + + clone() { + const c = new Vm(0, 0, true) + c.code = this.code + c.pc = this.pc + c.stack = new Stack() + c.stack._data = [...this.stack._data] + c.memory = new Memory() + c.memory._data = [...this.memory._data] + c.stopped = this.stopped + c.calldata = this.calldata + return c + } + + current_op() { + return Op.parse(this.code[this.pc]) + } + + step() { + const ret = this.#exec_next_opcode() + const op = ret[0] + if (ret[1] == -1) { + throw `Op ${op.name} with unset gas_used` + } + + if (op != Op.JUMP && op != Op.JUMPI) { + this.pc += op.blen + } + if (this.pc >= this.code.length) { + this.stopped = true + } + return ret + } + + #exec_next_opcode() { + const op = this.current_op() + let gas_used = op.gas !== undefined ? op.gas : -1 + + if (op >= Op.PUSH0 && op <= Op.PUSH32) { + const n = op - Op.PUSH0 + if (n != 0) { + const args = this.code.subarray(this.pc + 1, this.pc + 1 + n) + this.stack.push(uint8ArrayToBigInt(args)) + } else { + this.stack.push(0n) + } + return [op, gas_used] + } + if (op >= Op.DUP1 && op <= Op.DUP16) { + this.stack.dup(op - Op.DUP1 + 1) + return [op, gas_used] + } + if (op >= Op.SWAP1 && op <= Op.SWAP16) { + this.stack.swap(op - Op.SWAP1 + 1) + return [op, gas_used] + } + + switch (op) { + case Op.JUMP: + case Op.JUMPI: { + const s0 = Number(this.stack.pop()) + if (this.code[s0] != Op.JUMPDEST.code) { + throw 'jump to not JUMPDEST' + } + if (op == Op.JUMPI) { + const s1 = this.stack.pop() + if (s1 == 0n) { + this.pc += 1 + return [op, gas_used] + } + } + this.pc = Number(s0) + return [op, gas_used] + } + + case Op.JUMPDEST: + return [op, gas_used] + + case Op.REVERT: + this.stack.pop() + this.stack.pop() + this.stopped = true + return [op, 4] + + case Op.ISZERO: { + const raw = this.stack.pop() + const v = toBigInt(raw) + this.stack.push(v === 0n ? 1n : 0n) + return [op, gas_used, raw] + } + + case Op.POP: + this.stack.pop() + return [op] + + case Op.LT: + case Op.GT: + case Op.EQ: + case Op.SUB: + case Op.DIV: + case Op.EXP: + case Op.XOR: + case Op.AND: + case Op.SHR: { + const raws0 = this.stack.pop() + const raws1 = this.stack.pop() + + const s0 = toBigInt(raws0) + const s1 = toBigInt(raws1) + + let res + switch (op) { + case Op.EQ: + res = s0 == s1 ? 1n : 0n + break + case Op.GT: + res = s0 > s1 ? 1n : 0n + break + case Op.LT: + res = s0 < s1 ? 1n : 0n + break + case Op.SUB: + res = (s0 - s1) & E256M1 + break + case Op.DIV: + res = s1 != 0n ? s0 / s1 : 0n + break + case Op.EXP: + res = modExp(s0, s1, E256) + gas_used = 50 * (1 + Math.floor(s1.toString(2).length / 8)) // ~approx + break + case Op.XOR: + res = s0 ^ s1 + break + case Op.AND: + res = s0 & s1 + break + case Op.SHR: + res = (s1 >> s0) & E256M1 + break + } + this.stack.push(res) + return [op, gas_used, raws0, raws1] + } + + case Op.CALLVALUE: + this.stack.push(0n) // msg.value == 0 + return [op, gas_used] + + case Op.CALLDATALOAD: { + const offset = Number(this.stack.pop()) + this.stack.push(this.calldata.load(offset)) + return [op, gas_used] + } + + case Op.CALLDATASIZE: + this.stack.push(BigInt(this.calldata.length)) + return [op, gas_used] + + case Op.MSTORE: { + const offset = Number(this.stack.pop()) + const raw = this.stack.pop() + const v = + typeof raw === 'bigint' ? hexToUint8Array(raw.toString(16)) : raw + this.memory.store(offset, v) + return [op, 3] + } + + case Op.MLOAD: { + const offset = Number(this.stack.pop()) + const [val, used] = this.memory.load(offset) + this.stack.push(uint8ArrayToBigInt(val)) + return [op, 4, used] + } + + case Op.CALLDATACOPY: { + const mem_off = Number(this.stack.pop()) + const src_off = Number(this.stack.pop()) + const size = Number(this.stack.pop()) + const value = this.calldata.load(src_off, size) + this.memory.store(mem_off, value) + return [op, 4] + } + + default: + throw `unknown op ${op.name}` + } + } +} diff --git a/js/src/index.d.ts b/js/src/index.d.ts new file mode 100644 index 0000000..2283452 --- /dev/null +++ b/js/src/index.d.ts @@ -0,0 +1,4 @@ +export function functionSelectors( + code_hex_string: string, + gas_limit: number = 1e6, +) diff --git a/js/src/index.js b/js/src/index.js new file mode 100644 index 0000000..1fbf453 --- /dev/null +++ b/js/src/index.js @@ -0,0 +1,121 @@ +import Op from './evm/opcodes.js' +import Vm from './evm/vm.js' + +import { + hexToUint8Array, + bigIntToUint8Array, + uint8ArrayToBigInt, +} from './utils.js' + +class CallData extends Uint8Array { + load(offset, size = 32) { + const v = new CallData(32) + v.set(this.subarray(offset, offset + size)) + return v + } + toBigInt() { + return uint8ArrayToBigInt(this) + } +} + +class CallDataSignature extends Uint8Array { + toBigInt() { + return uint8ArrayToBigInt(this) + } +} + +function process(vm, gas_limit) { + let selectors = [] + let gas_used = 0 + + while (!vm.stopped) { + // console.log(vm.toString()); + let ret + try { + ret = vm.step() + gas_used += ret[1] + if (gas_used > gas_limit) { + throw `gas overflow: ${gas_used} > ${gas_limit}` + } + } catch (err) { + // console.log(err); + // throw err; + break + } + const op = ret[0] + + if (op == Op.EQ || op == Op.XOR) { + if (ret[2] instanceof CallDataSignature) { + selectors.push(ret[3]) + vm.stack.pop() + vm.stack.push(op == Op.XOR ? 1n : 0n) + } else if (ret[3] instanceof CallDataSignature) { + selectors.push(ret[2]) + vm.stack.pop() + vm.stack.push(op == Op.XOR ? 1n : 0n) + } + continue + } + + if (op == Op.SUB) { + if (ret[2] instanceof CallDataSignature) { + selectors.push(ret[3]) + } else if (ret[3] instanceof CallDataSignature) { + selectors.push(ret[2]) + } + continue + } + + if (op == Op.LT || op == Op.GT) { + const cloned_vm = vm.clone() + const [s, gas] = process(cloned_vm, gas_limit / 2) + selectors.push(...s) + gas_used += gas + const v = vm.stack.pop() + vm.stack.push(v === 0n ? 1n : 0n) + continue + } + + if (op == Op.SHR || op == Op.AND || op == Op.DIV) { + const x = vm.stack.peek() + if (x === undefined) throw 'stack peek failed' + if ((x & 0xffffffffn) == vm.calldata.toBigInt()) { + const v = vm.stack.pop() + vm.stack.push(new CallDataSignature(bigIntToUint8Array(v))) + } + continue + } + + if (op == Op.ISZERO) { + if (ret[2] instanceof CallDataSignature) { + selectors.push(0n) + } + continue + } + + if (op == Op.MLOAD) { + const used = ret[2] + for (const u of used) { + if (u instanceof CallData) { + const v = vm.stack.peek() + if ((v & 0xffffffffn) == vm.calldata.toBigInt()) { + vm.stack.push( + new CallDataSignature(bigIntToUint8Array(vm.stack.pop())), + ) + break + } + } + } + continue + } + } + + return [selectors, gas_used] +} + +export function functionSelectors(code_hex_string, gas_limit = 1e6) { + const code = hexToUint8Array(code_hex_string) + const vm = new Vm(code, new CallData([0xaa, 0xbb, 0xcc, 0xdd])) + const [selectors] = process(vm, gas_limit) + return selectors.map((x) => x.toString(16).padStart(8, '0')) +} diff --git a/js/src/utils.js b/js/src/utils.js new file mode 100644 index 0000000..45bb8e0 --- /dev/null +++ b/js/src/utils.js @@ -0,0 +1,40 @@ +export function hexToUint8Array(str) { + let start = 0 + if (str.startsWith('0x')) { + start = 2 + } + const arr = new Uint8Array((str.length - start) / 2) + let p = 0 + for (let i = start; i < str.length; i += 2) { + arr[p] = parseInt(str.slice(i, i + 2), 16) + p++ + } + return arr +} + +export function uint8ArrayToBigInt(arr) { + return BigInt( + arr.reduce((acc, v) => acc + v.toString(16).padStart(2, '0'), '0x'), + ) +} + +export function bigIntToUint8Array(val) { + return hexToUint8Array(val.toString(16)) +} + +export function modExp(a, b, n) { + a = a % n + var 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@@ +[tool.poetry] +name = "evmole" +version = "0.0.1" +description = "Extracts function selectors from EVM bytecode" +authors = ["Maxim Andreev "] +license = "MIT" +readme = "README.md" +repository = "https://github.com/cdump/evmole" + +[tool.poetry.dependencies] +python = "^3.10" +aiohttp = {version = "^3.9.0", extras = ["benchmark"]} + +[tool.poetry.group.dev.dependencies] +pytest = "^7.4.3" +black = "^23.11.0" +mypy = "^1.7.1" +ruff = "^0.1.6" + +[build-system] +requires = ["poetry-core"] +build-backend = "poetry.core.masonry.api" + +[tool.black] +line-length = 130 +target-version = ["py311"] +skip-string-normalization = true + +[tool.ruff] +extend-select = ["B", "Q"] +line-length = 130 +target-version = "py311" + +[tool.ruff.flake8-quotes] +inline-quotes = "single" + +[tool.ruff.per-file-ignores] +"__init__.py" = ["F401"] diff --git a/tests/memory_test.py b/tests/memory_test.py new file mode 100644 index 0000000..f24dff7 --- /dev/null +++ b/tests/memory_test.py @@ -0,0 +1,14 @@ +from evmole.evm.memory import Memory + +def test_memory(): + m = Memory() + + m.store(0, b'\xaa') + assert m.load(0) == (b'\xaa' + b'\x00'*31, [b'\xaa']) + assert m.load(1) == (b'\x00'*32, []) + + m.store(8, b'\xbb') + assert m.load(0) == (b'\xaa' + b'\x00'*7 + b'\xbb' + b'\x00'*23, [b'\xaa', b'\xbb']) + assert m.load(2) == (b'\x00'*6 + b'\xbb' + b'\x00'*25, [b'\xbb']) + assert m.load(8) == (b'\xbb' + b'\x00'*31, [b'\xbb']) + assert m.load(9) == (b'\x00'*32, []) diff --git a/tests/stack_test.py b/tests/stack_test.py new file mode 100644 index 0000000..0ddab2c --- /dev/null +++ b/tests/stack_test.py @@ -0,0 +1,16 @@ +from evmole.evm.stack import Stack + +def test_stack(): + s = Stack() + s.push(b'\xaa') + assert s.pop() == b'\xaa' + + s.push(b'\xaa') + s.push(b'\xbb') + assert s.pop() == b'\xbb' + assert s.pop() == b'\xaa' + + s.push(b'\xaa') + assert s.peek() == b'\xaa' + assert s.pop() == b'\xaa' + assert s.peek() is None