Introduce a random entropy source which can optionally be provided at initialization.

include/v8.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2783 matching lines @@
  protected:
   virtual int DecompressData(char* raw_data,
                              int* raw_data_size,
                              const char* compressed_data,
                              int compressed_data_size) = 0;
 
  private:
   char** raw_data;
 };
 
+
+/**
+ * EntropySource is used as a callback function when v8 needs a source
+ * of cryptographically safe entropy.

[Mads Ager (chromium), 2011/07/17 08:59:12]

Let's remove the "cryptographically safe" part of this comment. There is no
requirement on the entropy source. Whether or not it is cryptographically safe
is up to the user of the API to decide.

+ */
+typedef bool (*EntropySource)(unsigned char* buffer, size_t length);
+
 /**
  * Container class for static utility functions.
  */
 class V8EXPORT V8 {
  public:
   /** Set the callback to invoke in case of fatal errors. */
   static void SetFatalErrorHandler(FatalErrorCallback that);
 
   /**
    * Set the callback to invoke to check if code generation from
@@ skipping 205 matching lines @@
                                     size_t length);
 
   /**
    * Initializes from snapshot if possible. Otherwise, attempts to
    * initialize from scratch.  This function is called implicitly if
    * you use the API without calling it first.
    */
   static bool Initialize();
 
   /**
+   * Allows the host application to provide a callback which can be used
+   * as a source of entropy for random number generators.
+   */
+  static void SetEntropySource(EntropySource source);
+
+  /**
    * Adjusts the amount of registered external memory.  Used to give
    * V8 an indication of the amount of externally allocated memory
    * that is kept alive by JavaScript objects.  V8 uses this to decide
    * when to perform global garbage collections.  Registering
    * externally allocated memory will trigger global garbage
    * collections more often than otherwise in an attempt to garbage
    * collect the JavaScript objects keeping the externally allocated
    * memory alive.
    *
    * \param change_in_bytes the change in externally allocated memory
@@ skipping 1143 matching lines @@
 
 
 }  // namespace v8
 
 
 #undef V8EXPORT
 #undef TYPE_CHECK
 
 
 #endif  // V8_H_