/*
crypto.c -- Cryptographic miscellaneous functions and initialisation
- Copyright (C) 2007-2014 Guus Sliepen <guus@tinc-vpn.org>
+ Copyright (C) 2007-2022 Guus Sliepen <guus@tinc-vpn.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
-#include "../system.h"
-
-#include <openssl/rand.h>
-#include <openssl/evp.h>
-#include <openssl/engine.h>
-
#include "../crypto.h"
-#ifndef HAVE_MINGW
-
-static int random_fd = -1;
-
-static void random_init(void) {
- random_fd = open("/dev/urandom", O_RDONLY);
- if(random_fd < 0)
- random_fd = open("/dev/random", O_RDONLY);
- if(random_fd < 0) {
- fprintf(stderr, "Could not open source of random numbers: %s\n", strerror(errno));
- abort();
- }
-}
-
-static void random_exit(void) {
- close(random_fd);
-}
-
-void randomize(void *out, size_t outlen) {
- while(outlen) {
- size_t len = read(random_fd, out, outlen);
- if(len <= 0) {
- if(errno == EAGAIN || errno == EINTR)
- continue;
- fprintf(stderr, "Could not read random numbers: %s\n", strerror(errno));
- abort();
- }
- out += len;
- outlen -= len;
- }
-}
-
-#else
-
-#include <wincrypt.h>
-HCRYPTPROV prov;
-
-void random_init(void) {
- if(!CryptAcquireContext(&prov, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT)) {
- fprintf(stderr, "CryptAcquireContext() failed!\n");
- abort();
- }
-}
-
-void random_exit(void) {
- CryptReleaseContext(prov, 0);
-}
-
-void randomize(void *out, size_t outlen) {
- if(!CryptGenRandom(prov, outlen, out)) {
- fprintf(stderr, "CryptGenRandom() failed\n");
- abort();
- }
-}
-
-#endif
-
-void crypto_init(void) {
- random_init();
-}
-
-void crypto_exit(void) {
- random_exit();
-}
+// No-op for those cryptographic libraries that
+// do not require any additional initialization.
+void crypto_init(void) {}