Provided by: gnutls-doc_3.0.11+really2.12.14-5ubuntu3_all
gnutls_x509_crt_get_signature_algorithm - API function
#include <gnutls/x509.h> int gnutls_x509_crt_get_signature_algorithm(gnutls_x509_crt_t cert);
gnutls_x509_crt_t cert should contain a gnutls_x509_crt_t structure
This function will return a value of the gnutls_sign_algorithm_t enumeration that is the signature algorithm that has been used to sign this certificate.
a gnutls_sign_algorithm_t value, or a negative value on error.
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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.