X-Git-Url: https://www.tinc-vpn.org/git/browse?a=blobdiff_plain;f=src%2Fopenssl%2Fcrypto.c;h=fe5a599715c93c1c1317877bb45ab1d189af5087;hb=373b0c12d9d0e8a3b449fd18be704e28dd6403e1;hp=7e6e9f62fcaece3e0a328480fa0fe47ef1f0ef74;hpb=08aabbf9317806bc50a9a6693ca866c8936ce26b;p=tinc

diff --git a/src/openssl/crypto.c b/src/openssl/crypto.c
index 7e6e9f62..fe5a5997 100644
--- a/src/openssl/crypto.c
+++ b/src/openssl/crypto.c
@@ -1,6 +1,6 @@
 /*
     crypto.c -- Cryptographic miscellaneous functions and initialisation
-    Copyright (C) 2007 Guus Sliepen <guus@tinc-vpn.org>
+    Copyright (C) 2007-2021 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
@@ -12,34 +12,97 @@
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
 
-    You should have received a copy of the GNU General Public License
-    along with this program; if not, write to the Free Software
-    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
-    $Id$
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
-#include "system.h"
+#include "../system.h"
 
 #include <openssl/rand.h>
-#include <openssl/evp.h>
 #include <openssl/engine.h>
 
-#include "crypto.h"
+#include "../crypto.h"
+
+#ifndef HAVE_WINDOWS
+
+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 *vout, size_t outlen) {
+	uint8_t *out = vout;
+
+	while(outlen) {
+		ssize_t len = read(random_fd, out, outlen);
 
-void crypto_init() {
-        RAND_load_file("/dev/urandom", 1024);
+		if(len <= 0) {
+			if(len == -1 && (errno == EAGAIN || errno == EINTR)) {
+				continue;
+			}
 
-        ENGINE_load_builtin_engines();
-        ENGINE_register_all_complete();
+			fprintf(stderr, "Could not read random numbers: %s\n", strerror(errno));
+			abort();
+		}
 
-        OpenSSL_add_all_algorithms();
+		out += len;
+		outlen -= len;
+	}
 }
 
-void crypto_exit() {
-	EVP_cleanup();
+#else
+
+#include <wincrypt.h>
+HCRYPTPROV prov;
+
+static void random_init(void) {
+	if(!CryptAcquireContext(&prov, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT)) {
+		fprintf(stderr, "CryptAcquireContext() failed!\n");
+		abort();
+	}
+}
+
+static void random_exit(void) {
+	CryptReleaseContext(prov, 0);
 }
 
 void randomize(void *out, size_t outlen) {
-	RAND_pseudo_bytes(out, outlen);
+	if(!CryptGenRandom(prov, outlen, out)) {
+		fprintf(stderr, "CryptGenRandom() failed\n");
+		abort();
+	}
+}
+
+#endif
+
+void crypto_init(void) {
+	random_init();
+
+#if OPENSSL_VERSION_MAJOR < 3
+	ENGINE_load_builtin_engines();
+#endif
+
+	if(!RAND_status()) {
+		fprintf(stderr, "Not enough entropy for the PRNG!\n");
+		abort();
+	}
+}
+
+void crypto_exit(void) {
+	random_exit();
 }