micro-ECC for mbed, ported from GCC version from Github,
Dependents: mbed_microECC Wallet_v1
Diff: platform-specific.h
- Revision:
- 0:b6fdeddc0bc9
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/platform-specific.h Thu Sep 07 12:10:11 2017 +0000 @@ -0,0 +1,71 @@ +/* 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 + +#endif /* platform */ + +#endif /* _UECC_PLATFORM_SPECIFIC_H_ */