---
name: "gnutls_pubkey_verify_hash2"
section: "3"
platform: "linux"
package: "gnutls"
version: "3.8.13-3"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/gnutls_pubkey_verify_hash2"
---

# gnutls\_pubkey\_verify\_hash2(3)

API function

## NAME

gnutls\_pubkey\_verify\_hash2 - API function

## SYNOPSIS

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

**int gnutls\_pubkey\_verify\_hash2(gnutls\_pubkey\_t** *key***, gnutls\_sign\_algorithm\_t** *algo***, unsigned int** *flags***, const gnutls\_datum\_t \*** *hash***, const gnutls\_datum\_t \*** *signature***);**

## ARGUMENTS

- gnutls\_pubkey\_t key

  Holds the public key

- gnutls\_sign\_algorithm\_t algo

  The signature algorithm used

- unsigned int flags

  Zero or an OR list of **gnutls\_certificate\_verify\_flags**

- 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 public key. Note that unlike **gnutls\_privkey\_sign\_hash()**, this function accepts a signature algorithm instead of a digest algorithm. You can use **gnutls\_pk\_to\_sign()** to get the appropriate value.

## RETURNS

In case of a verification failure **GNUTLS\_E\_PK\_SIG\_VERIFY\_FAILED**  is returned, and zero or positive code on success. For known to be insecure signatures this function will return **GNUTLS\_E\_INSUFFICIENT\_SECURITY** unless the flag **GNUTLS\_VERIFY\_ALLOW\_BROKEN** is specified.

## SINCE

3\.0

## REPORTING BUGS

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

## COPYRIGHT

Copyright © 2001-2023 Free Software Foundation, Inc., and others.\
 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

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