Provided by: gnutls-doc_3.0.11+really2.12.14-5ubuntu3_all
gnutls_x509_crt_get_key_usage - API function
#include <gnutls/x509.h> int gnutls_x509_crt_get_key_usage(gnutls_x509_crt_t cert, unsigned int * key_usage, unsigned int * critical);
gnutls_x509_crt_t cert should contain a gnutls_x509_crt_t structure unsigned int * key_usage where the key usage bits will be stored unsigned int * critical will be non zero if the extension is marked as critical
This function will return certificate's key usage, by reading the keyUsage X.509 extension (220.127.116.11). The key usage value will ORed values of the: GNUTLS_KEY_DIGITAL_SIGNATURE, GNUTLS_KEY_NON_REPUDIATION, GNUTLS_KEY_KEY_ENCIPHERMENT, GNUTLS_KEY_DATA_ENCIPHERMENT, GNUTLS_KEY_KEY_AGREEMENT, GNUTLS_KEY_KEY_CERT_SIGN, GNUTLS_KEY_CRL_SIGN, GNUTLS_KEY_ENCIPHER_ONLY, GNUTLS_KEY_DECIPHER_ONLY.
the certificate key usage, or a negative value in case of parsing error. If the certificate does not contain the keyUsage extension GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE will be returned.
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