https://github.com/weijiekoh/poseidon_bug

https://github.com/weijiekoh/poseidon_bug

Last synced: about 2 months ago
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• Host: GitHub
• URL: https://github.com/weijiekoh/poseidon_bug
• Owner: weijiekoh
• Created: 2020-02-22T07:02:24.000Z (almost 5 years ago)
• Default Branch: master
• Last Pushed: 2023-01-24T01:27:09.000Z (almost 2 years ago)
• Last Synced: 2023-03-05T18:05:41.356Z (almost 2 years ago)
• Language: TypeScript
• Size: 644 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 11
• Metadata Files:
  • Readme: README.md

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README

        
There seems to be a bug with the Poseidon hash function bytecode generator in

`circomlib` 0.0.20.

To demonstrate this bug, clone this repository, install dependencies, and

compile the source code:

```bash

git clone https://github.com/weijiekoh/poseidon_bug.git && \

cd poseidon_bug && \

npm i && npm run build

```

In a separate terminal, run:

```bash

npm run ganache

```

Next, run:

```bash

node build/index.js

```

If the output is:

```

21334876322667183667165053088102559857160636052568525182000620475434027971580

21334876322667183667165053088102559857160636052568525182000620475434027971580

```

then there is a bug with the Poseidon hash contract bytecode generator.

The bug occurs when the `t` value is set to anything other than 6:

```js

poseidonGenContract.createCode(3, 8, 57, POSEIDON_SEED)

```

It returns the same value for any input, which should not be the case.

If set to 6, the contract's `poseidon()` function will return different hash

values for different inputs.