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/* Copyright 2015, Kenneth MacKay. Licensed under the BSD 2-clause license. */
#ifndef _UECC_PLATFORM_SPECIFIC_H_
#define _UECC_PLATFORM_SPECIFIC_H_
#include "types.h"
#if (defined(_WIN32) || defined(_WIN64))
/* Windows */
// use pragma syntax to prevent tweaking the linker script for getting CryptXYZ function
#pragma comment(lib, "crypt32.lib")
#pragma comment(lib, "advapi32.lib")
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <wincrypt.h>
static int default_RNG(uint8_t *dest, unsigned size) {
HCRYPTPROV prov;
if (!CryptAcquireContext(&prov, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT)) {
return 0;
}
CryptGenRandom(prov, size, (BYTE *)dest);
CryptReleaseContext(prov, 0);
return 1;
}
#define default_RNG_defined 1
#elif defined(unix) || defined(__linux__) || defined(__unix__) || defined(__unix) || \
(defined(__APPLE__) && defined(__MACH__)) || defined(uECC_POSIX)
/* Some POSIX-like system with /dev/urandom or /dev/random. */
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#ifndef O_CLOEXEC
#define O_CLOEXEC 0
#endif
static int default_RNG(uint8_t *dest, unsigned size) {
int fd = open("/dev/urandom", O_RDONLY | O_CLOEXEC);
if (fd == -1) {
fd = open("/dev/random", O_RDONLY | O_CLOEXEC);
if (fd == -1) {
return 0;
}
}
char *ptr = (char *)dest;
size_t left = size;
while (left > 0) {
ssize_t bytes_read = read(fd, ptr, left);
if (bytes_read <= 0) { // read failed
close(fd);
return 0;
}
left -= bytes_read;
ptr += bytes_read;
}
close(fd);
return 1;
}
#define default_RNG_defined 1
#elif defined(RIOT_VERSION)
#include <random.h>
static int default_RNG(uint8_t *dest, unsigned size) {
random_bytes(dest, size);
return 1;
}
#define default_RNG_defined 1
#elif defined(NRF52_SERIES)
#include "app_error.h"
#include "nrf_crypto_rng.h"
static int default_RNG(uint8_t *dest, unsigned size)
{
// make sure to call nrf_crypto_init and nrf_crypto_rng_init first
ret_code_t ret_code = nrf_crypto_rng_vector_generate(dest, size);
return (ret_code == NRF_SUCCESS) ? 1 : 0;
}
#define default_RNG_defined 1
#endif /* platform */
#endif /* _UECC_PLATFORM_SPECIFIC_H_ */