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Fix transport encoding of nistp521 signatures #623

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merged 2 commits into from
Jul 28, 2020

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fmeum
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@fmeum fmeum commented Jul 28, 2020

SignatureECDSA.encode() does not correctly handle signatures longer
than 128 bytes, which affects signatures using the nistp521 curve.

This commits fixes the issue by replacing the ad-hoc ASN.1 DER
parsing with a use of ASN1InputStream.

SignatureECDSA.encode() does not correctly handle signatures longer
than 128 bytes, which affects signatures using the nistp521 curve.

This commits fixes the issue by replacing the ad-hoc ASN.1 DER
parsing with a use of ASN1InputStream.
@hierynomus
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Would be great to have a test here also :).

@fmeum
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fmeum commented Jul 28, 2020

Would be great to have a test here also :).

The test will be added with #607. Unfortunately, due to #600, we could only add a test here if we were to add an ecdsa-sha2-nistp521 host key, which then would mean that the tests in #607 would no longer verify that #600 has been fixed. This is a confusing situation, but once #623 and #607 have been merged (in this order), both will be covered by passing tests.

@hierynomus hierynomus merged commit 4b1619d into hierynomus:master Jul 28, 2020
@fmeum fmeum deleted the ecdsa_521_fix branch July 28, 2020 10:05
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3 participants