5502879a5b
This is very much still work in progress and much more will change before the final 2.0.0 Some APIs have changed. New libraries have been added. LittleFS included. Co-authored-by: Seon Rozenblum <seonr@3sprockets.com> Co-authored-by: Me No Dev <me-no-dev@users.noreply.github.com> Co-authored-by: geeksville <kevinh@geeksville.com> Co-authored-by: Mike Dunston <m_dunston@comcast.net> Co-authored-by: Unexpected Maker <seon@unexpectedmaker.com> Co-authored-by: Seon Rozenblum <seonr@3sprockets.com> Co-authored-by: microDev <70126934+microDev1@users.noreply.github.com> Co-authored-by: tobozo <tobozo@users.noreply.github.com> Co-authored-by: bobobo1618 <bobobo1618@users.noreply.github.com> Co-authored-by: lorol <lorolouis@gmail.com> Co-authored-by: geeksville <kevinh@geeksville.com> Co-authored-by: Limor "Ladyada" Fried <limor@ladyada.net> Co-authored-by: Sweety <switi.mhaiske@espressif.com> Co-authored-by: Loick MAHIEUX <loick111@gmail.com> Co-authored-by: Larry Bernstone <lbernstone@gmail.com> Co-authored-by: Valerii Koval <valeros@users.noreply.github.com> Co-authored-by: 快乐的我531 <2302004040@qq.com> Co-authored-by: chegewara <imperiaonline4@gmail.com> Co-authored-by: Clemens Kirchgatterer <clemens@1541.org> Co-authored-by: Aron Rubin <aronrubin@gmail.com> Co-authored-by: Pete Lewis <601236+lewispg228@users.noreply.github.com>
128 lines
2.9 KiB
C
128 lines
2.9 KiB
C
/*
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* prng.h -- Pseudo Random Numbers
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*
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* Copyright (C) 2010-2011 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 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 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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* prng(). You might want to change prng() to use a better PRNG on your specific
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* 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 prng(Buf,Length) contiki_prng_impl((Buf), (Length))
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#define 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 prng(Buf,Length) lwip_prng_impl((Buf), (Length))
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#define prng_init(Value)
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#elif defined(_WIN32)
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#define prng_init(Value)
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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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* prng(). You might want to change prng() to use a better PRNG on your specific
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* 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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#else
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#include <stdlib.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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* prng(). You might want to change prng() to use a better PRNG on your specific
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* 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-- )
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*buf++ = rand() & 0xFF;
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return 1;
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}
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#endif
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#ifndef prng
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/**
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* Fills \p Buf with \p Length bytes of random data.
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*
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* @hideinitializer
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*/
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#define prng(Buf,Length) coap_prng_impl((Buf), (Length))
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#endif
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#ifndef prng_init
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/**
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* Called to set the PRNG seed. You may want to re-define this to allow for a
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* better PRNG.
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*
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* @hideinitializer
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*/
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#define prng_init(Value) srand((unsigned long)(Value))
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#endif
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/** @} */
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#endif /* COAP_PRNG_H_ */
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