Reland "Cut down /crypto and switch what is left of it to boringssl".

crypto/nss_crypto_module_delegate.h

-// Copyright 2013 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_CRYPTO_MODULE_DELEGATE_H_
-#define CRYPTO_NSS_CRYPTO_MODULE_DELEGATE_H_
-
-#include <string>
-
-#include "base/callback_forward.h"
-#include "crypto/scoped_nss_types.h"
-
-namespace crypto {
-
-// PK11_SetPasswordFunc is a global setting.  An implementation of
-// CryptoModuleBlockingPasswordDelegate should be passed using wincx() as the
-// user data argument (|wincx|) to relevant NSS functions, which the global
-// password handler will call to do the actual work. This delegate should only
-// be used in NSS calls on worker threads due to the blocking nature.
-class CryptoModuleBlockingPasswordDelegate {
- public:
-  virtual ~CryptoModuleBlockingPasswordDelegate() {}
-
-  // Return a value suitable for passing to the |wincx| argument of relevant NSS
-  // functions. This should be used instead of passing the object pointer
-  // directly to avoid accidentally casting a pointer to a subclass to void* and
-  // then casting back to a pointer of the base class
-  void* wincx() { return this; }
-
-  // Requests a password to unlock |slot_name|. The interface is synchronous
-  // because NSS cannot issue an asynchronous request. |retry| is true if this
-  // is a request for the retry and we previously returned the wrong password.
-  // The implementation should set |*cancelled| to true if the user cancelled
-  // instead of entering a password, otherwise it should return the password the
-  // user entered.
-  virtual std::string RequestPassword(const std::string& slot_name, bool retry,
-                                      bool* cancelled) = 0;
-
-};
-
-// Extends CryptoModuleBlockingPasswordDelegate with the ability to return a
-// slot in which to act. (Eg, which slot to store a generated key in.)
-class NSSCryptoModuleDelegate : public CryptoModuleBlockingPasswordDelegate {
- public:
-  ~NSSCryptoModuleDelegate() override {}
-
-  // Get the slot to store the generated key.
-  virtual ScopedPK11Slot RequestSlot() = 0;
-};
-
-}  // namespace crypto
-
-#endif  // CRYPTO_NSS_CRYPTO_MODULE_DELEGATE_H_