ed25519/src/seed.c

#include "ed25519.h"

#ifndef ED25519_NO_SEED

#ifdef _WIN32
#include <Windows.h>
#include <Wincrypt.h>
#else
#include <stdio.h>
#endif

int ed25519_create_seed(unsigned char *seed) {
#ifdef _WIN32
	HCRYPTPROV prov;

	if (!CryptAcquireContext(&prov, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT))  {
		return 1;
	}

	if (!CryptGenRandom(prov, 32, seed))  {
		CryptReleaseContext(prov, 0);
		return 1;
	}

	CryptReleaseContext(prov, 0);
#else
	FILE *f = fopen("/dev/urandom", "rb");

	if (f == NULL) {
		return 1;
	}

	fread(seed, 1, 32, f);
	fclose(f);
#endif

    return 0;
}

#endif