Adds support for the <keygen> element to Windows, matching support present on...

net/base/keygen_handler.h

Index: net/base/keygen_handler.h
===================================================================
--- net/base/keygen_handler.h	(revision 43235)
+++ net/base/keygen_handler.h	(working copy)
@@ -5,8 +5,12 @@
 #ifndef NET_BASE_KEYGEN_HANDLER_H_
 #define NET_BASE_KEYGEN_HANDLER_H_
 
+#include <map>
 #include <string>
 
+#include "base/lock.h"
+#include "base/singleton.h"
+
 namespace net {
 
 // This class handles keypair generation for generating client
@@ -16,6 +20,53 @@
 
 class KeygenHandler {
  public:
+  // This class stores the relative location for a given private key. It does
+  // not store the private key, or a handle to the private key, on the basis
+  // that the key may be located on a smart card or device which may not be
+  // present at the time of retrieval.
+  class KeyLocation {
+   public:
+#if defined(OS_WIN)
+    std::wstring container_name;
+    std::wstring provider_name;
+#elif defined(OS_MACOSX)
+    std::string keychain_path;
+#elif defined(USE_NSS)
+    std::string slot_name;
+#endif
+
+    // Only used by unit tests
+    bool Equals(const KeyLocation& location) const;
+  };
+
+  // This class stores information about the keys the KeygenHandler has
+  // generated, so that the private keys can be properly associated with any
+  // certificates that might be sent to the client based on those keys.
+  class Cache {
+   public:
+    static Cache* GetInstance();
+    void Insert(const std::string& public_key_info,
+                const KeyLocation& location);
+
+    // True if the |public_key_info| was located and the location stored into
+    // |*location|
+    bool Find(const std::string& public_key_info, KeyLocation* location);
+
+   private:
+    typedef std::map<std::string, KeyLocation> KeyLocationMap;
+
+    // Obtain an instance of the KeyCache by using GetInstance()
+    Cache() { }
+    friend struct DefaultSingletonTraits<Cache>;
+
+    Lock lock_;
+
+    // The key cache. You must obtain |lock_| before using |cache_|
+    KeyLocationMap cache_;
+
+    DISALLOW_COPY_AND_ASSIGN(Cache);
+  };
+
   // Creates a handler that will generate a key with the given key size
   // and incorporate the |challenge| into the Netscape SPKAC structure.
   inline KeygenHandler(int key_size_in_bits, const std::string& challenge);