[gnutls-devel] GnuTLS | GnuTLS accpepts a certificate wihtout subject public key (#1160)

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GOODPWDCETCSZ created an issue: https://gitlab.com/gnutls/gnutls/-/issues/1160



## Description of problem:
GnuTLS accpepts a certificate wihtout subject public key. However, OpenSSL, mbedTLS, wolfSSL and NSS reject it.

## Version of gnutls used:
3.5.5, 3.6.13

## Distributor of gnutls (e.g., Ubuntu, Fedora, RHEL)
Ubuntu x64

## How reproducible:

Steps to Reproduce:

 * `certtool --verify --load-ca-certificate ca.pem --infile seed-0u0.pem`

## Actual results:
```
Chain verification output: Verified. The certificate is trusted. 
```

## Expected results:
The certificate is rejected.

[ca.zip](/uploads/36a5ca8cb1ebb7f2a2d80064355c50bc/ca.zip)

[seed-0u0.zip](/uploads/a064167e52e13aa8b7c30c72ab5d2844/seed-0u0.zip)

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