Provided by: gnutls-doc_3.6.9-5ubuntu1_all
gnutls_x509_crt_get_key_id - API function
#include <gnutls/x509.h> int gnutls_x509_crt_get_key_id(gnutls_x509_crt_t crt, unsigned int flags, unsigned char * output_data, size_t * output_data_size);
gnutls_x509_crt_t crt Holds the certificate unsigned int flags should be one of the flags from gnutls_keyid_flags_t unsigned char * output_data will contain the key ID size_t * output_data_size holds the size of output_data (and will be replaced by the actual size of parameters)
This function will return a unique ID that depends on the public key parameters. This ID can be used in checking whether a certificate corresponds to the given private key. If the buffer provided is not long enough to hold the output, then *output_data_size is updated and GNUTLS_E_SHORT_MEMORY_BUFFER will be returned. The output will normally be a SHA-1 hash output, which is 20 bytes.
In case of failure a negative error code will be returned, and 0 on success.
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