[gnutls-devel] GnuTLS | Gnutls incorrectly handles the CRL Number field (#1684)

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One happy person created an issue: https://gitlab.com/gnutls/gnutls/-/issues/1684



## Description of problem:

       Hello Developer, I have a CRL file with a CRL number value of -36. According to RFC5280, the CRL number should be a non-negative integer, but Gnutls successfully printed this CRL without any errors. However, the value of the CRL Number is "dc", which is 220 in decimal.

## 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_file_test_.der

## Actual results:
The Gnutls successfully printed this CRL, but the value of the CRL Number is "dc", which is 220 in decimal.

## Test Cases:

[crl_file_test_.der](/uploads/03fc0407a2cc0bdc45cfad091eed963f/crl_file_test_.der)

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