[gnutls-devel] GnuTLS | RFC 5280 compliance:GeneralizedTime parser accepts incorrect time values. (#1702)

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One happy person created an issue: https://gitlab.com/gnutls/gnutls/-/issues/1702



## Description of problem:
The RFC standard for X.509 CRL restricts the revocationDate field to only two formats: UTCTime (YYMMDDHHMMSSZ) in ASN.1 representation and GeneralizedTime (YYYYMMDDHHMMSSZ). However, GnuTLS 3.8.9 accepts the revocationDate field with a value like GeneralizedTime("201213122547Z") in the CRL.

## Version of gnutls used:
GnuTLS 3.8.9

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

## How reproducible:
certtool --crl-info --inder --infile crl_revoked_rev_date_gn_14.der

## Actual results:
The revocationDate value of the CRL is printed as "Revoked at: Wed Dec 31 23:59:59 UTC 1969".

## Expected results:
It should reject a CRL with a revocationDate field with a value like GeneralizedTime("201213122547Z").
[crl_revoked_rev_date_gn_14.der](/uploads/f7d4887476edd8974c0831cf6ca7e83b/crl_revoked_rev_date_gn_14.der)

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