html_viewer: Move webcrypto to a place where html_viewer can use it.

components/webcrypto/algorithm_dispatch.h

+// Copyright 2014 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_ALGORITHM_DISPATCH_H_
+#define COMPONENTS_WEBCRYPTO_ALGORITHM_DISPATCH_H_
+
+#include <stdint.h>
+#include <vector>
+
+#include "base/memory/scoped_ptr.h"
+#include "third_party/WebKit/public/platform/WebCrypto.h"
+
+namespace webcrypto {
+
+class AlgorithmImplementation;
+class CryptoData;
+class GenerateKeyResult;
+class Status;
+
+// These functions provide an entry point for synchronous webcrypto operations.
+//
+// The inputs to these methods come from Blink, and hence the validations done
+// by Blink can be assumed:
+//
+//   * The algorithm parameters are consistent with the algorithm
+//   * The key contains the required usage for the operation
+
+Status Encrypt(const blink::WebCryptoAlgorithm& algorithm,
+               const blink::WebCryptoKey& key,
+               const CryptoData& data,
+               std::vector<uint8_t>* buffer);
+
+Status Decrypt(const blink::WebCryptoAlgorithm& algorithm,
+               const blink::WebCryptoKey& key,
+               const CryptoData& data,
+               std::vector<uint8_t>* buffer);
+
+Status Digest(const blink::WebCryptoAlgorithm& algorithm,
+              const CryptoData& data,
+              std::vector<uint8_t>* buffer);
+
+Status GenerateKey(const blink::WebCryptoAlgorithm& algorithm,
+                   bool extractable,
+                   blink::WebCryptoKeyUsageMask usages,
+                   GenerateKeyResult* result);
+
+Status ImportKey(blink::WebCryptoKeyFormat format,
+                 const CryptoData& key_data,
+                 const blink::WebCryptoAlgorithm& algorithm,
+                 bool extractable,
+                 blink::WebCryptoKeyUsageMask usages,
+                 blink::WebCryptoKey* key);
+
+Status ExportKey(blink::WebCryptoKeyFormat format,
+                 const blink::WebCryptoKey& key,
+                 std::vector<uint8_t>* buffer);
+
+Status Sign(const blink::WebCryptoAlgorithm& algorithm,
+            const blink::WebCryptoKey& key,
+            const CryptoData& data,
+            std::vector<uint8_t>* buffer);
+
+Status Verify(const blink::WebCryptoAlgorithm& algorithm,
+              const blink::WebCryptoKey& key,
+              const CryptoData& signature,
+              const CryptoData& data,
+              bool* signature_match);
+
+Status WrapKey(blink::WebCryptoKeyFormat format,
+               const blink::WebCryptoKey& key_to_wrap,
+               const blink::WebCryptoKey& wrapping_key,
+               const blink::WebCryptoAlgorithm& wrapping_algorithm,
+               std::vector<uint8_t>* buffer);
+
+Status UnwrapKey(blink::WebCryptoKeyFormat format,
+                 const CryptoData& wrapped_key_data,
+                 const blink::WebCryptoKey& wrapping_key,
+                 const blink::WebCryptoAlgorithm& wrapping_algorithm,
+                 const blink::WebCryptoAlgorithm& algorithm,
+                 bool extractable,
+                 blink::WebCryptoKeyUsageMask usages,
+                 blink::WebCryptoKey* key);
+
+Status DeriveBits(const blink::WebCryptoAlgorithm& algorithm,
+                  const blink::WebCryptoKey& base_key,
+                  unsigned int length_bits,
+                  std::vector<uint8_t>* derived_bytes);
+
+// Derives a key by calling the underlying deriveBits/getKeyLength/importKey
+// operations.
+//
+// Note that whereas the WebCrypto spec uses a single "derivedKeyType"
+// AlgorithmIdentifier in its specification of deriveKey(), here two separate
+// AlgorithmIdentifiers are used:
+//
+//   * |import_algorithm|  -- The parameters required by the derived key's
+//                            "importKey" operation.
+//
+//   * |key_length_algorithm| -- The parameters required by the derived key's
+//                               "get key length" operation.
+//
+// WebCryptoAlgorithm is not a flexible type like AlgorithmIdentifier (it cannot
+// be easily re-interpreted as a different parameter type).
+//
+// Therefore being provided with separate parameter types for the import
+// parameters and the key length parameters simplifies passing the right
+// parameters onto ImportKey() and GetKeyLength() respectively.
+Status DeriveKey(const blink::WebCryptoAlgorithm& algorithm,
+                 const blink::WebCryptoKey& base_key,
+                 const blink::WebCryptoAlgorithm& import_algorithm,
+                 const blink::WebCryptoAlgorithm& key_length_algorithm,
+                 bool extractable,
+                 blink::WebCryptoKeyUsageMask usages,
+                 blink::WebCryptoKey* derived_key);
+
+scoped_ptr<blink::WebCryptoDigestor> CreateDigestor(
+    blink::WebCryptoAlgorithmId algorithm);
+
+bool SerializeKeyForClone(const blink::WebCryptoKey& key,
+                          blink::WebVector<uint8_t>* key_data);
+
+bool DeserializeKeyForClone(const blink::WebCryptoKeyAlgorithm& algorithm,
+                            blink::WebCryptoKeyType type,
+                            bool extractable,
+                            blink::WebCryptoKeyUsageMask usages,
+                            const CryptoData& key_data,
+                            blink::WebCryptoKey* key);
+
+}  // namespace webcrypto
+
+#endif  // COMPONENTS_WEBCRYPTO_ALGORITHM_DISPATCH_H_