[gnutls-devel] GnuTLS | GnuTLS parsed a cert without error. But ZCertificate reported the error that the modulus is not a positive number (#987)

[Development of GNU's TLS library]

Chu Chen created an issue: https://gitlab.com/gnutls/gnutls/-/issues/987



## Description of problem:

GnuTLS parsed a cert without error. But ZCertificate reported the error that the modulus is not a positive number

## Version of gnutls used:
3.5.5

## Distributor of gnutls (e.g., Ubuntu, Fedora, RHEL)
Ubuntu 18.04 x64

## How reproducible:

Steps to Reproduce:

 * certtool -i -infile path/to/cert_file

## Actual results:

GnuTLS parsed a cert without error. But ZCertificate reported the error "level=error msg="could not parse certificate: x509: RSA modulus is not a positive number".

## Expected results:

No discrepancy between GnuTLS and ZCertificate.
[cert-example-ie-cer02.zip](/uploads/39891d7cc28d70395c92bd0c9c1ff8e5/cert-example-ie-cer02.zip)

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