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coap_prng: Support use of getentropy() if getrandom() is not available #2172

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Merged
mrdeep1 merged 1 commit into from
Sep 28, 2026
Merged

coap_prng: Support use of getentropy() if getrandom() is not available #2172

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1 change: 1 addition & 0 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -365,6 +365,7 @@ if(NOT ZEPHYR_BASE)
check_function_exists(getifaddrs HAVE_GETIFADDRS)
check_function_exists(strnlen HAVE_STRNLEN)
check_function_exists(strrchr HAVE_STRRCHR)
check_function_exists(getentropy HAVE_GETENTROPY)
check_function_exists(getrandom HAVE_GETRANDOM)
check_function_exists(random HAVE_RANDOM)
check_function_exists(if_nametoindex HAVE_IF_NAMETOINDEX)
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2 changes: 1 addition & 1 deletion configure.ac
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Expand Up @@ -1363,7 +1363,7 @@ AC_TYPE_SSIZE_T

# Checks for library functions.
AC_CHECK_FUNCS([memset select socket strcasecmp strrchr getaddrinfo getifaddrs \
strnlen malloc pthread_mutex_lock getrandom random if_nametoindex])
strnlen malloc pthread_mutex_lock getentropy getrandom random if_nametoindex])

# Check if -lsocket -lnsl is required (specifically Solaris)
AC_SEARCH_LIBS([socket], [socket])
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3 changes: 3 additions & 0 deletions src/coap_prng.c
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Expand Up @@ -124,6 +124,9 @@ coap_prng_default(void *buf, size_t len) {
#elif defined(HAVE_GETRANDOM)
return (getrandom(buf, len, 0) > 0) ? 1 : 0;

#elif defined(HAVE_GETENTROPY)
return (getentropy(buf, len) == 0) ? 1 : 0;

#elif defined(HAVE_RANDOM)
#define RAND_BYTES (RAND_MAX >= 0xffffff ? 3 : (RAND_MAX >= 0xffff ? 2 : 1))
unsigned char *dst = (unsigned char *)buf;
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