Move crypto files out of base, to a top level directory.

src/crypto is now an independent project that contains our
cryptographic primitives (except md5 and sha1).

This removes the base dependency from nss, openssl and sqlite.

BUG=76996
TEST=none
Review URL: http://codereview.chromium.org/6805019

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@81611 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 113 insertions, 0 deletions

diff --git a/crypto/openssl_util.cc b/crypto/openssl_util.cc
new file mode 100644
index 0000000..feb47ca
--- /dev/null
+++ b/crypto/openssl_util.cc
@@ -0,0 +1,113 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "crypto/openssl_util.h"
+
+#include <openssl/err.h>
+#include <openssl/ssl.h>
+
+#include "base/logging.h"
+#include "base/memory/scoped_vector.h"
+#include "base/memory/singleton.h"
+#include "base/string_piece.h"
+#include "base/synchronization/lock.h"
+
+namespace crypto {
+
+namespace {
+
+unsigned long CurrentThreadId() {
+  return static_cast<unsigned long>(base::PlatformThread::CurrentId());
+}
+
+// Singleton for initializing and cleaning up the OpenSSL library.
+class OpenSSLInitSingleton {
+ public:
+  static OpenSSLInitSingleton* GetInstance() {
+    // We allow the SSL environment to leak for multiple reasons:
+    //   -  it is used from a non-joinable worker thread that is not stopped on
+    //      shutdown, hence may still be using OpenSSL library after the AtExit
+    //      runner has completed.
+    //   -  There are other OpenSSL related singletons (e.g. the client socket
+    //      context) who's cleanup depends on the global environment here, but
+    //      we can't control the order the AtExit handlers will run in so
+    //      allowing the global environment to leak at least ensures it is
+    //      available for those other singletons to reliably cleanup.
+    return base::Singleton<OpenSSLInitSingleton,
+               base::LeakySingletonTraits<OpenSSLInitSingleton> >::get();
+  }
+ private:
+  friend struct DefaultSingletonTraits<OpenSSLInitSingleton>;
+  OpenSSLInitSingleton() {
+    SSL_load_error_strings();
+    SSL_library_init();
+    OpenSSL_add_all_algorithms();
+    int num_locks = CRYPTO_num_locks();
+    locks_.reserve(num_locks);
+    for (int i = 0; i < num_locks; ++i)
+      locks_.push_back(new base::Lock());
+    CRYPTO_set_locking_callback(LockingCallback);
+    CRYPTO_set_id_callback(CurrentThreadId);
+  }
+
+  ~OpenSSLInitSingleton() {
+    CRYPTO_set_locking_callback(NULL);
+    EVP_cleanup();
+    ERR_free_strings();
+  }
+
+  static void LockingCallback(int mode, int n, const char* file, int line) {
+    OpenSSLInitSingleton::GetInstance()->OnLockingCallback(mode, n, file, line);
+  }
+
+  void OnLockingCallback(int mode, int n, const char* file, int line) {
+    CHECK_LT(static_cast<size_t>(n), locks_.size());
+    if (mode & CRYPTO_LOCK)
+      locks_[n]->Acquire();
+    else
+      locks_[n]->Release();
+  }
+
+  // These locks are used and managed by OpenSSL via LockingCallback().
+  ScopedVector<base::Lock> locks_;
+
+  DISALLOW_COPY_AND_ASSIGN(OpenSSLInitSingleton);
+};
+
+// Callback routine for OpenSSL to print error messages. |str| is a
+// NULL-terminated string of length |len| containing diagnostic information
+// such as the library, function and reason for the error, the file and line
+// where the error originated, plus potentially any context-specific
+// information about the error. |context| contains a pointer to user-supplied
+// data, which is currently unused.
+// If this callback returns a value <= 0, OpenSSL will stop processing the
+// error queue and return, otherwise it will continue calling this function
+// until all errors have been removed from the queue.
+int OpenSSLErrorCallback(const char* str, size_t len, void* context) {
+  DVLOG(1) << "\t" << StringPiece(str, len);
+  return 1;
+}
+
+}  // namespace
+
+void EnsureOpenSSLInit() {
+  (void)OpenSSLInitSingleton::GetInstance();
+}
+
+void ClearOpenSSLERRStack(const tracked_objects::Location& location) {
+  if (logging::DEBUG_MODE && VLOG_IS_ON(1)) {
+    int error_num = ERR_peek_error();
+    if (error_num == 0)
+      return;
+
+    std::string message;
+    location.Write(true, true, &message);
+    DVLOG(1) << "OpenSSL ERR_get_error stack from " << message;
+    ERR_print_errors_cb(&OpenSSLErrorCallback, NULL);
+  } else {
+    ERR_clear_error();
+  }
+}
+
+}  // namespace crypto