[gnutls-devel] GnuTLS | Verification of deterministic RSA-PSS signature fails (#953)

[Development of GNU's TLS library]

Anderson Sasaki created an issue: https://gitlab.com/gnutls/gnutls/-/issues/953



## Description of problem:
gnutls fails to verify signatures generated using ``GNUTLS_SIGN_RSA_PSS_RSAE_SHA256`` algorithm and passing the ``GNUTLS_PRIVKEY_FLAG_REPRODUCIBLE`` flag.

## Version of gnutls used:
Current master (6df0dab742b4ee5bd3fa55680657326305bde8cc)

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

## How reproducible:
100%

Steps to Reproduce:

Compile and run the following reproducer code:
[reproducer.c](/uploads/ea67aad60c0804ea7da6bf999c145851/reproducer.c)

## Actual results:
The reproducer outputs:

Verification failed!

## Expected results:
The reproducer outputs:

Verification succeeded!

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