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CentOS 7.0 - man page for gnutls_x509_crt_get_extension_info (centos section 3)

gnutls_x509_crt_get_extension_info(3)			gnutls			gnutls_x509_crt_get_extension_info(3)

gnutls_x509_crt_get_extension_info - API function
#include <gnutls/x509.h> int gnutls_x509_crt_get_extension_info(gnutls_x509_crt_t cert, int indx, void * oid, size_t * oid_size, unsigned int * critical);
gnutls_x509_crt_t cert should contain a gnutls_x509_crt_t structure int indx Specifies which extension OID to send. Use (0) to get the first one. void * oid a pointer to a structure to hold the OID size_t * oid_size initially holds the maximum size of oid , on return holds actual size of oid . unsigned int * critical output variable with critical flag, may be NULL.
This function will return the requested extension OID in the certificate, and the critical flag for it. The extension OID will be stored as a string in the provided buffer. Use gnutls_x509_crt_get_extension_data() to extract the data. If the buffer provided is not long enough to hold the output, then oid_size is updated and GNUTLS_E_SHORT_MEMORY_BUFFER will be returned. The oid returned will be null termi- nated, although oid_size will not account for the trailing null.
On success, GNUTLS_E_SUCCESS (0) is returned, otherwise a negative error code is returned. If you have reached the last extension available GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE will be returned.
Report bugs to <bug-gnutls@gnu.org>. General guidelines for reporting bugs: http://www.gnu.org/gethelp/ GnuTLS home page: http://www.gnu.org/software/gnutls/
Copyright (C) 2012 Free Software Foundation, Inc.. Copying and distribution of this file, with or without modification, are permitted in any medium without roy- alty provided the copyright notice and this notice are preserved.
The full documentation for gnutls is maintained as a Texinfo manual. If the info and gnutls programs are properly installed at your site, the command info gnutls should give you access to the complete manual. As an alternative you may obtain the manual from: http://www.gnu.org/software/gnutls/manual/ gnutls 3.1.15 gnutls_x509_crt_get_extension_info(3)

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