coap_hashkey.h File Reference

definition of hash key type and helper functions More...

#include "libcoap.h"
#include "uthash.h"
#include "str.h"

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Macros
#define	coap_hash(String, Length, Result)   coap_hash_impl((String),(Length),(Result))
#define	COAP_DEFAULT_HASH
#define	coap_str_hash(Str, H)
	Calls coap_hash() with given coap_string_t object as parameter. More...

Typedefs
typedef unsigned char	coap_key_t[4]

Functions
void	coap_hash_impl (const unsigned char *s, unsigned int len, coap_key_t h)
	Calculates a fast hash over the given string s of length len and stores the result into h. More...

Detailed Description

definition of hash key type and helper functions

Definition in file coap_hashkey.h.

Macro Definition Documentation

COAP_DEFAULT_HASH

#define COAP_DEFAULT_HASH

Definition at line 40 of file coap_hashkey.h.

coap_hash

#define coap_hash	(		String,
			Length,
			Result
	)		coap_hash_impl((String),(Length),(Result))

Definition at line 36 of file coap_hashkey.h.

coap_str_hash

#define coap_str_hash	(		Str,
			H
	)

Calls coap_hash() with given coap_string_t object as parameter.

Parameters

Str	Must contain a pointer to a coap string object.
H	A coap_key_t object to store the result.

Definition at line 53 of file coap_hashkey.h.

Typedef Documentation

coap_key_t

typedef unsigned char coap_key_t[4]

Definition at line 22 of file coap_hashkey.h.

Function Documentation

coap_hash_impl()

void coap_hash_impl	(	const unsigned char *	s,
		unsigned int	len,
		coap_key_t	h
	)

Calculates a fast hash over the given string s of length len and stores the result into h.

Depending on the exact implementation, this function cannot be used as one-way function to check message integrity or simlar.

Parameters

s	The string used for hash calculation.
len	The length of s.
h	The result buffer to store the calculated hash key.

Definition at line 12 of file coap_hashkey.c.