Avoid using OpenSSL's random number functions.

diff --git a/src/Makefile.am b/src/Makefile.am
index c48e3fd..02d7ec2 100644 (file)
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -21,7 +21,6 @@ ed25519_SOURCES = \
        ed25519/keypair.c \
        ed25519/precomp_data.h \
        ed25519/sc.c ed25519/sc.h \
-       ed25519/seed.c \
        ed25519/sha512.c ed25519/sha512.h \
        ed25519/sign.c \
        ed25519/verify.c

diff --git a/src/ed25519/seed.c b/src/ed25519/seed.c
deleted file mode 100644 (file)
index ca4089c..0000000
--- a/src/ed25519/seed.c
+++ /dev/null
@@ -1,40 +0,0 @@
-#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
\ No newline at end of file

diff --git a/src/openssl/crypto.c b/src/openssl/crypto.c
index 6c5cbc8..ed8c8e2 100644 (file)
--- a/src/openssl/crypto.c
+++ b/src/openssl/crypto.c
@@ -1,6 +1,6 @@
 /*
     crypto.c -- Cryptographic miscellaneous functions and initialisation
-    Copyright (C) 2007-2013 Guus Sliepen <guus@tinc-vpn.org>
+    Copyright (C) 2007-2014 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
@@ -25,8 +25,65 @@
 
 #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) {
-       RAND_load_file("/dev/urandom", 1024);
+       random_init();
 
        ENGINE_load_builtin_engines();
        ENGINE_register_all_complete();
@@ -42,8 +99,5 @@ void crypto_init(void) {
 
 void crypto_exit(void) {
        EVP_cleanup();
-}
-
-void randomize(void *out, size_t outlen) {
-       RAND_pseudo_bytes(out, outlen);
+       random_exit();
 }