gnutls\_x509\_crt\_verify\_data2(3) gnutls gnutls\_x509\_crt\_verify\_data2(3)

# [NAME](#NAME)

gnutls\_x509\_crt\_verify\_data2 - API function

# [SYNOPSIS](#SYNOPSIS)

**#include <gnutls/x509.h>**

**int gnutls\_x509\_crt\_verify\_data2(gnutls\_x509\_crt\_t crt, gnutls\_sign\_algorithm\_t algo, unsigned int flags, const gnutls\_datum\_t * data, const gnutls\_datum\_t * signature);**

# [ARGUMENTS](#ARGUMENTS)

[gnutls\_x509\_crt\_t crt](#gnutls_x509_crt_t)

Holds the certificate to verify with

[gnutls\_sign\_algorithm\_t algo](#gnutls_sign_algorithm_t)

The signature algorithm used

[unsigned int flags](#unsigned)

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

[const gnutls\_datum\_t * data](#const)

holds the signed data

[const gnutls\_datum\_t * signature](#const~2)

contains the signature

# [DESCRIPTION](#DESCRIPTION)

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

# [RETURNS](#RETURNS)

In case of a verification failure **GNUTLS\_E\_PK\_SIG\_VERIFY\_FAILED** is returned, **GNUTLS\_E\_EXPIRED** or **GNUTLS\_E\_NOT\_YET\_ACTIVATED** on expired or not yet activated certificate and zero or positive code on success.

Note that since GnuTLS 3.5.6 this function introduces checks in the end certificate ( *crt* ), including time checks and key usage checks.

# [SINCE](#SINCE)

3.4.0

# [REPORTING BUGS](#REPORTING_BUGS)

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

# [COPYRIGHT](#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](#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/](https://www.gnutls.org/manual/)

3.8.13 gnutls

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Document: gnutls_x509_crt_verify_data2(3) from gnutls 3.8.13-r1 (Chainguard OS)
Source: https://gitlab.com/gnutls/gnutls