mirror of
https://github.com/obgm/libcoap.git
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Jon Shallow
26cd2446a8
examples/contiki/coap-observer.c: examples/etsi_iot_01.c: include/coap2/coap_prng.h: include/coap2/net.h: src/coap_debug.c: src/coap_openssl.c: src/coap_session.c: src/net.c: src/option.c: tests/test_error_response.c: tests/test_options.c: prng -> coap_prng prng_init -> coap_prng_init coap_option_setb -> coap_option_filter_set coap_option_clrb -> coap_option_filter_unset coap_option_getb -> coap_option_filter_get include/coap2/coap.h.windows: win32/libcoap.vcxproj: win32/libcoap.vcxproj.filters: prng.h -> coap_prng.h include/coap2/option.h: Add in COAP_DEPRECATED in deprecated functions.
139 lines
3.5 KiB
C
139 lines
3.5 KiB
C
/*
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* coap_prng.h -- Pseudo Random Numbers
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*
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* Copyright (C) 2010-2020 Olaf Bergmann <bergmann@tzi.org>
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*
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* This file is part of the CoAP library libcoap. Please see README for terms
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* of use.
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*/
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/**
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* @file coap_prng.h
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* @brief Pseudo Random Numbers
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*/
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#ifndef COAP_PRNG_H_
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#define COAP_PRNG_H_
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/**
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* @defgroup coap_prng Pseudo Random Numbers
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* API functions for gerating pseudo random numbers
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* @{
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*/
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#if defined(WITH_CONTIKI)
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#include <string.h>
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/**
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* Fills \p buf with \p len random bytes. This is the default implementation for
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* coap_prng(). You might want to change contiki_prng_impl() to use a better
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* PRNG on your specific platform.
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*/
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COAP_STATIC_INLINE int
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contiki_prng_impl(unsigned char *buf, size_t len) {
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uint16_t v = random_rand();
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while (len > sizeof(v)) {
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memcpy(buf, &v, sizeof(v));
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len -= sizeof(v);
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buf += sizeof(v);
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v = random_rand();
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}
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memcpy(buf, &v, len);
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return 1;
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}
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#define coap_prng(Buf,Length) contiki_prng_impl((Buf), (Length))
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#define coap_prng_init(Value) random_init((uint16_t)(Value))
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#elif defined(WITH_LWIP) && defined(LWIP_RAND)
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COAP_STATIC_INLINE int
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lwip_prng_impl(unsigned char *buf, size_t len) {
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u32_t v = LWIP_RAND();
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while (len > sizeof(v)) {
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memcpy(buf, &v, sizeof(v));
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len -= sizeof(v);
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buf += sizeof(v);
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v = LWIP_RAND();
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}
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memcpy(buf, &v, len);
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return 1;
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}
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#define coap_prng(Buf,Length) lwip_prng_impl((Buf), (Length))
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#define coap_prng_init(Value)
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#elif defined(_WIN32)
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errno_t __cdecl rand_s( _Out_ unsigned int* _RandomValue );
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/**
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* Fills \p buf with \p len random bytes. This is the default implementation for
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* coap_prng(). You might want to change coap_prng_impl() to use a better
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* PRNG on your specific platform.
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*/
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COAP_STATIC_INLINE int
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coap_prng_impl( unsigned char *buf, size_t len ) {
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while ( len != 0 ) {
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uint32_t r = 0;
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size_t i;
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if ( rand_s( &r ) != 0 )
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return 0;
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for ( i = 0; i < len && i < 4; i++ ) {
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*buf++ = (uint8_t)r;
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r >>= 8;
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}
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len -= i;
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}
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return 1;
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}
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#define coap_prng(Buf,Length) coap_prng_impl((Buf), (Length))
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#define coap_prng_init(Value)
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#else
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/**
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* Data type for random number generator function. The function must
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* fill @p len bytes of random data into the buffer starting at @p
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* out. On success, the function should return 1, zero otherwise.
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*/
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typedef int (*coap_rand_func_t)(void *out, size_t len);
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/**
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* Replaces the current random number generation function with the
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* default function @p rng.
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*
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* @param rng The random number generation function to use.
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*/
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void coap_set_prng(coap_rand_func_t rng);
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/**
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* Seeds the default random number generation function with the given
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* @p seed. The default random number generation function will use
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* getrandom() if available, ignoring the seed.
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*
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* @param seed The seed for the pseudo random number generator.
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*/
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void coap_prng_init(unsigned long seed);
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/**
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* Fills @p buf with @p len random bytes using the default pseudo
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* random number generator. The default PRNG can be changed with
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* coap_set_prng(). This function returns 1 when @p len random bytes
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* have been written to @p buf, zero otherwise.
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*
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* @param buf The buffer to fill with random bytes.
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* @param len The number of random bytes to write into @p buf.
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*
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* @return 1 on success, 0 otherwise.
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*/
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int coap_prng(void *buf, size_t len);
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#endif /* POSIX */
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/** @} */
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#endif /* COAP_PRNG_H_ */
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