---
name: "gnutls_x509_crt_verify_hash"
section: "3"
platform: "linux"
package: "gnutls-doc"
version: "3.3.8-6+deb8u7"
release: "Debian 8 (Jessie)"
platforms: ["linux"]
url: "https://new.carta.tech/gnutls_x509_crt_verify_hash"
---

# gnutls\_x509\_crt\_verify\_hash(3)

API function

## NAME

gnutls\_x509\_crt\_verify\_hash - API function

## SYNOPSIS

**#include \<gnutls/compat.h\>**

**int gnutls\_x509\_crt\_verify\_hash(gnutls\_x509\_crt\_t** *crt***, unsigned int** *flags***, const gnutls\_datum\_t \*** *hash***, const gnutls\_datum\_t \*** *signature***);**

## ARGUMENTS

- gnutls\_x509\_crt\_t crt

  Holds the certificate

- unsigned int flags

  should be 0 for now

- const gnutls\_datum\_t \* hash

  holds the hash digest to be verified

- const gnutls\_datum\_t \* signature

  contains the signature

## DESCRIPTION

This function will verify the given signed digest, using the parameters from the certificate.

Deprecated. This function cannot be easily used securely.  Use **gnutls\_pubkey\_verify\_hash2()** instead.

## RETURNS

In case of a verification failure **GNUTLS\_E\_PK\_SIG\_VERIFY\_FAILED**  is returned, and zero or positive code on success.

## REPORTING BUGS

Report bugs to \<bugs@gnutls.org\>.\
 Home page: http://www.gnutls.org

## COPYRIGHT

Copyright © 2001-2014 Free Software Foundation, Inc..\
 Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved.

## SEE ALSO

The full documentation for **gnutls** is maintained as a Texinfo manual. If the /usr/share/doc/gnutls/ directory does not contain the HTML form visit

- http://www.gnutls.org/manual/