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@deftypefun {int} {gnutls_pubkey_get_key_id} (gnutls_pubkey_t @var{key}, unsigned int @var{flags}, unsigned char * @var{output_data}, size_t * @var{output_data_size})
@var{key}: Holds the public key
@var{flags}: should be one of the flags from @code{gnutls_keyid_flags_t}
@var{output_data}: will contain the key ID
@var{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 public key.
If the buffer provided is not long enough to hold the output, then
*output_data_size is updated and @code{GNUTLS_E_SHORT_MEMORY_BUFFER} will
be returned. The output will normally be a SHA-1 hash output,
which is 20 bytes.
@strong{Returns:} In case of failure a negative error code will be
returned, and 0 on success.
@strong{Since:} 2.12.0
@end deftypefun
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