1 files changed, 141 insertions, 0 deletions
diff --git a/src/lib/crypt_ops/crypto_init.c b/src/lib/crypt_ops/crypto_init.c
new file mode 100644
index 0000000000..620fe8e1be
--- /dev/null
+++ b/src/lib/crypt_ops/crypto_init.c
@@ -0,0 +1,141 @@
+/* Copyright (c) 2001, Matej Pfajfar.
+ * Copyright (c) 2001-2004, Roger Dingledine.
+ * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
+ * Copyright (c) 2007-2018, The Tor Project, Inc. */
+/* See LICENSE for licensing information */
+
+/**
+ * \file crypto_init.c
+ *
+ * \brief Initialize and shut down Tor's crypto library and subsystem.
+ **/
+
+#include "orconfig.h"
+
+#include "lib/crypt_ops/crypto_init.h"
+
+#include "lib/crypt_ops/crypto_curve25519.h"
+#include "lib/crypt_ops/crypto_dh.h"
+#include "lib/crypt_ops/crypto_ed25519.h"
+#include "lib/crypt_ops/crypto_openssl_mgt.h"
+#include "lib/crypt_ops/crypto_nss_mgt.h"
+#include "lib/crypt_ops/crypto_rand.h"
+
+#include "siphash.h"
+
+/** Boolean: has OpenSSL's crypto been initialized? */
+static int crypto_early_initialized_ = 0;
+
+/** Boolean: has OpenSSL's crypto been initialized? */
+static int crypto_global_initialized_ = 0;
+
+static int have_seeded_siphash = 0;
+
+/** Set up the siphash key if we haven't already done so. */
+int
+crypto_init_siphash_key(void)
+{
+  struct sipkey key;
+  if (have_seeded_siphash)
+    return 0;
+
+  crypto_rand((char*) &key, sizeof(key));
+  siphash_set_global_key(&key);
+  have_seeded_siphash = 1;
+  return 0;
+}
+
+/** Initialize the crypto library.  Return 0 on success, -1 on failure.
+ */
+int
+crypto_early_init(void)
+{
+  if (!crypto_early_initialized_) {
+
+    crypto_early_initialized_ = 1;
+
+#ifdef ENABLE_OPENSSL
+    crypto_openssl_early_init();
+#endif
+#ifdef ENABLE_NSS
+    crypto_nss_early_init();
+#endif
+
+    if (crypto_seed_rng() < 0)
+      return -1;
+    if (crypto_init_siphash_key() < 0)
+      return -1;
+
+    curve25519_init();
+    ed25519_init();
+  }
+  return 0;
+}
+
+/** Initialize the crypto library.  Return 0 on success, -1 on failure.
+ */
+int
+crypto_global_init(int useAccel, const char *accelName, const char *accelDir)
+{
+  if (!crypto_global_initialized_) {
+    if (crypto_early_init() < 0)
+      return -1;
+
+    crypto_global_initialized_ = 1;
+
+    crypto_dh_init();
+
+#ifdef ENABLE_OPENSSL
+    if (crypto_openssl_late_init(useAccel, accelName, accelDir) < 0)
+      return -1;
+#endif
+#ifdef ENABLE_NSS
+    if (crypto_nss_late_init() < 0)
+      return -1;
+#endif
+  }
+  return 0;
+}
+
+/** Free crypto resources held by this thread. */
+void
+crypto_thread_cleanup(void)
+{
+#ifdef ENABLE_OPENSSL
+  crypto_openssl_thread_cleanup();
+#endif
+}
+
+/**
+ * Uninitialize the crypto library. Return 0 on success. Does not detect
+ * failure.
+ */
+int
+crypto_global_cleanup(void)
+{
+  crypto_dh_free_all();
+
+#ifdef ENABLE_OPENSSL
+  crypto_openssl_global_cleanup();
+#endif
+#ifdef ENABLE_NSS
+  crypto_nss_global_cleanup();
+#endif
+
+  crypto_early_initialized_ = 0;
+  crypto_global_initialized_ = 0;
+  have_seeded_siphash = 0;
+  siphash_unset_global_key();
+
+  return 0;
+}
+
+/** Run operations that the crypto library requires to be happy again
+ * after forking. */
+void
+crypto_postfork(void)
+{
+#ifdef ENABLE_NSS
+  crypto_nss_postfork();
+#endif
+}