text: // Copyright 2015 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 COMPONENTS_WEBCRYPTO_BLINK_KEY_HANDLE_H_
  #define COMPONENTS_WEBCRYPTO_BLINK_KEY_HANDLE_H_
  
  #include <openssl/base.h>
  #include <stdint.h>
  
  #include <vector>
  
  #include "crypto/scoped_openssl_types.h"
  #include "third_party/WebKit/public/platform/WebCryptoKey.h"
  
  // Blink keys (blink::WebCryptoKey) have an associated key handle
  // (blink::WebCryptoKeyHandle) used to store custom data. This is where the
  // underlying EVP_PKEY is stored for asymmetric keys, or an std::vector
  // containing the bytes for symmetric keys.
  //
  // This file contains helpers for creating the key handles, and extracting
  // properties from it.
  
  namespace webcrypto {
  
  class CryptoData;
  
  // Returns a reference to the symmetric key data wrapped by the given Blink
  // key. The returned reference is owned by |key|. This function must only be
  // called on secret keys (HMAC, AES, etc).
  const std::vector<uint8_t>& GetSymmetricKeyData(const blink::WebCryptoKey& key);
  
  // Returns the EVP_PKEY* wrapped by the given Blink key. The returned pointer
  // is owned by |key|. This function must only be called on asymmetric keys
  // (RSA, EC, etc).
  EVP_PKEY* GetEVP_PKEY(const blink::WebCryptoKey& key);
  
  // Returns a reference to the serialized key data. This reference is owned by
  // |key|. This function can be called for any key type.
  const std::vector<uint8_t>& GetSerializedKeyData(
      const blink::WebCryptoKey& key);
  
  // Creates a symmetric key handle that can be passed to Blink. The caller takes
  // ownership of the returned pointer.
  blink::WebCryptoKeyHandle* CreateSymmetricKeyHandle(
      const CryptoData& key_bytes);
  
  // Creates an asymmetric key handle that can be passed to Blink. The caller
  // takes
  // ownership of the returned pointer.
  //
  // TODO(eroman): This should _move_ input serialized_key_data rather than
  // create a copy, since all the callers are passing in vectors that are later
  // thrown away anyway.
  blink::WebCryptoKeyHandle* CreateAsymmetricKeyHandle(
      crypto::ScopedEVP_PKEY pkey,
      const std::vector<uint8_t>& serialized_key_data);
  
  }  // namespace webcrypto
  
  #endif  // COMPONENTS_WEBCRYPTO_BLINK_KEY_HANDLE_H_
  