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Verify Signatures are in the correct Sub-group #80

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kirk-baird opened this issue Oct 17, 2019 · 3 comments
Open

Verify Signatures are in the correct Sub-group #80

kirk-baird opened this issue Oct 17, 2019 · 3 comments

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@kirk-baird
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  • py-ecc Version: 1.7.1

What is wrong?

Currently verification of a signature does not check that the signature is in the correct subgroup. This poses a security risk when verifying a pairing.

How can it be fixed

When verifying a signature check r * sig == 0 before pairing.

I will update #79 to include the check as this had been inserted into the standard.
@pipermerriam
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If this isn't explicitely part of #79 maybe this change can be extracted to a stand-alone PR?

@kirk-baird
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I made this PR cause it is a security vulnerability that currently exists but it is included as part or the BLS stand.

Do you this it should be it's own PR or part of the BLS standard PR?

@kirk-baird
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I've added this in #79

pacrob added a commit to pacrob/py_ecc that referenced this issue Oct 29, 2023
@pacrob
template cleanup following initial merge with py-evm (ethereum#80)
431db89 
* template cleanup following initial merge with py-evm

* add flake8 pin comment

* correct license years

* add pin note to mypy
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@pipermerriam @kirk-baird