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@deftypefun {int} {gnutls_hex_decode} (const gnutls_datum_t * @var{hex_data}, void * @var{result}, size_t * @var{result_size})
@var{hex_data}: contain the encoded data
@var{result}: the place where decoded data will be copied
@var{result_size}: holds the size of the result
This function will decode the given encoded data, using the hex
encoding used by PSK password files.
Initially @code{result_size} must hold the maximum size available in
@code{result} , and on return it will contain the number of bytes written.
@strong{Returns:} @code{GNUTLS_E_SHORT_MEMORY_BUFFER} if the buffer given is not
long enough, @code{GNUTLS_E_PARSING_ERROR} on invalid hex data, or 0 on success.
@end deftypefun
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