Initialize NSS in the PPAPI process for ClearKey CDM.

crypto/nss_util.h

 // Copyright (c) 2012 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.
 
 #ifndef CRYPTO_NSS_UTIL_H_
 #define CRYPTO_NSS_UTIL_H_
 
 #include <string>
 #include "base/basictypes.h"
 #include "crypto/crypto_export.h"
@@ skipping 18 matching lines @@
 // EarlySetupForNSSInit performs lightweight setup which must occur before the
 // process goes multithreaded. This does not initialise NSS. For test, see
 // EnsureNSSInit.
 CRYPTO_EXPORT void EarlySetupForNSSInit();
 #endif
 
 // Initialize NRPR if it isn't already initialized.  This function is
 // thread-safe, and NSPR will only ever be initialized once.
 CRYPTO_EXPORT void EnsureNSPRInit();
 
+// Initialize NSS safely for strict sandboxing.  This function makes sure that
+// NSS is initialized safely and will have proper entropy in a restricted,
+// sandboxed environment.
+//
+// As a defense in depth measure, this function should be called in a sandboxed
+// environment to make sure NSS will not load security modules that could
+// expose private data and keys.  Make sure to get an LGTM from security
+// if you use this.
+CRYPTO_EXPORT void WarmUpNSSSafely();
+
 // Initialize NSS if it isn't already initialized.  This must be called before
 // any other NSS functions.  This function is thread-safe, and NSS will only
 // ever be initialized once.
 CRYPTO_EXPORT void EnsureNSSInit();
 
 // Call this before calling EnsureNSSInit() will force NSS to initialize
 // without a persistent DB.  This is used for the special case where access of
 // persistent DB is prohibited.
 //
 // TODO(hclam): Isolate loading default root certs.
 //
 // NSS will be initialized without loading any user security modules, including
 // the built-in root certificates module. User security modules need to be
 // loaded manually after NSS initialization.
 //
 // If EnsureNSSInit() is called before then this function has no effect.
 //
 // Calling this method only has effect on Linux.
 //
 // WARNING: Use this with caution.
 CRYPTO_EXPORT void ForceNSSNoDBInit();
 
-// This methods is used to disable checks in NSS when used in a forked process.
+// This method is used to disable checks in NSS when used in a forked process.
 // NSS checks whether it is running a forked process to avoid problems when
 // using user security modules in a forked process.  However if we are sure
 // there are no modules loaded before the process is forked then there is no
 // harm disabling the check.
 //
 // This method must be called before EnsureNSSInit() to take effect.
 //
 // WARNING: Use this with caution.
 CRYPTO_EXPORT void DisableNSSForkCheck();
 
@@ skipping 91 matching lines @@
  private:
   base::Lock *lock_;
   DISALLOW_COPY_AND_ASSIGN(AutoNSSWriteLock);
 };
 
 #endif  // defined(USE_NSS)
 
 }  // namespace crypto
 
 #endif  // CRYPTO_NSS_UTIL_H_