third_party/WebKit/Source/modules/crypto/SubtleCrypto.cpp - chromium/src - Git at Google

 /*
  * Copyright (C) 2013 Google Inc. 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 with the
  * distribution.
  *     * Neither the name of Google Inc. nor the names of its
  * contributors may be used to endorse or promote products derived from
  * this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */

 #include "modules/crypto/SubtleCrypto.h"

 #include "bindings/core/v8/Dictionary.h"
 #include "core/dom/ExecutionContext.h"
 #include "modules/crypto/CryptoHistograms.h"
 #include "modules/crypto/CryptoKey.h"
 #include "modules/crypto/CryptoResultImpl.h"
 #include "modules/crypto/NormalizeAlgorithm.h"
 #include "platform/JSONValues.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebCrypto.h"
 #include "public/platform/WebCryptoAlgorithm.h"

 namespace blink {

 static bool parseAlgorithm(const AlgorithmIdentifier& raw, WebCryptoOperation op, WebCryptoAlgorithm& algorithm, CryptoResult* result)
 {
     AlgorithmError error;
     bool success = normalizeAlgorithm(raw, op, algorithm, &error);
     if (!success)
         result->completeWithError(error.errorType, error.errorDetails);
     return success;
 }

 static bool canAccessWebCrypto(ScriptState* scriptState, CryptoResult* result)
 {
     String errorMessage;
     if (!scriptState->getExecutionContext()->isSecureContext(errorMessage, ExecutionContext::WebCryptoSecureContextCheck)) {
         result->completeWithError(WebCryptoErrorTypeNotSupported, errorMessage);
         return false;
     }

     return true;
 }

 static bool copyStringProperty(const char* property, const Dictionary& source, JSONObject* destination)
 {
     String value;
     if (!DictionaryHelper::get(source, property, value))
         return false;
     destination->setString(property, value);
     return true;
 }

 static bool copySequenceOfStringProperty(const char* property, const Dictionary& source, JSONObject* destination)
 {
     Vector<String> value;
     if (!DictionaryHelper::get(source, property, value))
         return false;
     RefPtr<JSONArray> jsonArray = JSONArray::create();
     for (unsigned i = 0; i < value.size(); ++i)
         jsonArray->pushString(value[i]);
     destination->setArray(property, jsonArray.release());
     return true;
 }

 // FIXME: At the time of writing this is not a part of the spec. It is based an
 // an unpublished editor's draft for:
 //   https://www.w3.org/Bugs/Public/show_bug.cgi?id=24963
 // See http://crbug.com/373917.
 static bool copyJwkDictionaryToJson(const Dictionary& dict, CString& jsonUtf8, CryptoResult* result)
 {
     RefPtr<JSONObject> jsonObject = JSONObject::create();

     if (!copyStringProperty("kty", dict, jsonObject.get())) {
         result->completeWithError(WebCryptoErrorTypeData, "The required JWK member \"kty\" was missing");
         return false;
     }

     copyStringProperty("use", dict, jsonObject.get());
     copySequenceOfStringProperty("key_ops", dict, jsonObject.get());
     copyStringProperty("alg", dict, jsonObject.get());

     bool ext;
     if (DictionaryHelper::get(dict, "ext", ext))
         jsonObject->setBoolean("ext", ext);

     const char* const propertyNames[] = { "d", "n", "e", "p", "q", "dp", "dq", "qi", "k", "crv", "x", "y" };
     for (unsigned i = 0; i < WTF_ARRAY_LENGTH(propertyNames); ++i)
         copyStringProperty(propertyNames[i], dict, jsonObject.get());

     String json = jsonObject->toJSONString();
     jsonUtf8 = json.utf8();
     return true;
 }

 SubtleCrypto::SubtleCrypto()
 {
 }

 ScriptPromise SubtleCrypto::encrypt(ScriptState* scriptState, const AlgorithmIdentifier& rawAlgorithm, CryptoKey* key, const DOMArrayPiece& data)
 {
     CryptoResultImpl* result = CryptoResultImpl::create(scriptState);
     ScriptPromise promise = result->promise();

     if (!canAccessWebCrypto(scriptState, result))
         return promise;

     WebCryptoAlgorithm algorithm;
     if (!parseAlgorithm(rawAlgorithm, WebCryptoOperationEncrypt, algorithm, result))
         return promise;

     if (!key->canBeUsedForAlgorithm(algorithm, WebCryptoKeyUsageEncrypt, result))
         return promise;

     histogramAlgorithmAndKey(scriptState->getExecutionContext(), algorithm, key->key());
     Platform::current()->crypto()->encrypt(algorithm, key->key(), data.bytes(), data.byteLength(), result->result());
     return promise;
 }

 ScriptPromise SubtleCrypto::decrypt(ScriptState* scriptState, const AlgorithmIdentifier& rawAlgorithm, CryptoKey* key, const DOMArrayPiece& data)
 {
     CryptoResultImpl* result = CryptoResultImpl::create(scriptState);
     ScriptPromise promise = result->promise();

     if (!canAccessWebCrypto(scriptState, result))
         return promise;

     WebCryptoAlgorithm algorithm;
     if (!parseAlgorithm(rawAlgorithm, WebCryptoOperationDecrypt, algorithm, result))
         return promise;

     if (!key->canBeUsedForAlgorithm(algorithm, WebCryptoKeyUsageDecrypt, result))
         return promise;

     histogramAlgorithmAndKey(scriptState->getExecutionContext(), algorithm, key->key());
     Platform::current()->crypto()->decrypt(algorithm, key->key(), data.bytes(), data.byteLength(), result->result());
     return promise;
 }

 ScriptPromise SubtleCrypto::sign(ScriptState* scriptState, const AlgorithmIdentifier& rawAlgorithm, CryptoKey* key, const DOMArrayPiece& data)
 {
     CryptoResultImpl* result = CryptoResultImpl::create(scriptState);
     ScriptPromise promise = result->promise();

     if (!canAccessWebCrypto(scriptState, result))
         return promise;

     WebCryptoAlgorithm algorithm;
     if (!parseAlgorithm(rawAlgorithm, WebCryptoOperationSign, algorithm, result))
         return promise;

     if (!key->canBeUsedForAlgorithm(algorithm, WebCryptoKeyUsageSign, result))
         return promise;

     histogramAlgorithmAndKey(scriptState->getExecutionContext(), algorithm, key->key());
     Platform::current()->crypto()->sign(algorithm, key->key(), data.bytes(), data.byteLength(), result->result());
     return promise;
 }

 ScriptPromise SubtleCrypto::verifySignature(ScriptState* scriptState, const AlgorithmIdentifier& rawAlgorithm, CryptoKey* key, const DOMArrayPiece& signature, const DOMArrayPiece& data)
 {
     CryptoResultImpl* result = CryptoResultImpl::create(scriptState);
     ScriptPromise promise = result->promise();

     if (!canAccessWebCrypto(scriptState, result))
         return promise;

     WebCryptoAlgorithm algorithm;
     if (!parseAlgorithm(rawAlgorithm, WebCryptoOperationVerify, algorithm, result))
         return promise;

     if (!key->canBeUsedForAlgorithm(algorithm, WebCryptoKeyUsageVerify, result))
         return promise;

     histogramAlgorithmAndKey(scriptState->getExecutionContext(), algorithm, key->key());
     Platform::current()->crypto()->verifySignature(algorithm, key->key(), signature.bytes(), signature.byteLength(), data.bytes(), data.byteLength(), result->result());
     return promise;
 }

 ScriptPromise SubtleCrypto::digest(ScriptState* scriptState, const AlgorithmIdentifier& rawAlgorithm, const DOMArrayPiece& data)
 {
     CryptoResultImpl* result = CryptoResultImpl::create(scriptState);
     ScriptPromise promise = result->promise();

     if (!canAccessWebCrypto(scriptState, result))
         return promise;

     WebCryptoAlgorithm algorithm;
     if (!parseAlgorithm(rawAlgorithm, WebCryptoOperationDigest, algorithm, result))
         return promise;

     histogramAlgorithm(scriptState->getExecutionContext(), algorithm);
     Platform::current()->crypto()->digest(algorithm, data.bytes(), data.byteLength(), result->result());
     return promise;
 }

 ScriptPromise SubtleCrypto::generateKey(ScriptState* scriptState, const AlgorithmIdentifier& rawAlgorithm, bool extractable, const Vector<String>& rawKeyUsages)
 {
     CryptoResultImpl* result = CryptoResultImpl::create(scriptState);
     ScriptPromise promise = result->promise();

     if (!canAccessWebCrypto(scriptState, result))
         return promise;

     WebCryptoKeyUsageMask keyUsages;
     if (!CryptoKey::parseUsageMask(rawKeyUsages, keyUsages, result))
         return promise;

     WebCryptoAlgorithm algorithm;
     if (!parseAlgorithm(rawAlgorithm, WebCryptoOperationGenerateKey, algorithm, result))
         return promise;

     histogramAlgorithm(scriptState->getExecutionContext(), algorithm);
     Platform::current()->crypto()->generateKey(algorithm, extractable, keyUsages, result->result());
     return promise;
 }

 ScriptPromise SubtleCrypto::importKey(ScriptState* scriptState, const String& rawFormat, const ArrayBufferOrArrayBufferViewOrDictionary& keyData, const AlgorithmIdentifier& rawAlgorithm, bool extractable, const Vector<String>& rawKeyUsages)
 {
     CryptoResultImpl* result = CryptoResultImpl::create(scriptState);
     ScriptPromise promise = result->promise();

     if (!canAccessWebCrypto(scriptState, result))
         return promise;

     WebCryptoKeyFormat format;
     if (!CryptoKey::parseFormat(rawFormat, format, result))
         return promise;

     if (keyData.isDictionary()) {
         if (format != WebCryptoKeyFormatJwk) {
             result->completeWithError(WebCryptoErrorTypeData, "Key data must be a buffer for non-JWK formats");
             return promise;
         }
     } else if (format == WebCryptoKeyFormatJwk) {
         result->completeWithError(WebCryptoErrorTypeData, "Key data must be an object for JWK import");
         return promise;
     }

     WebCryptoKeyUsageMask keyUsages;
     if (!CryptoKey::parseUsageMask(rawKeyUsages, keyUsages, result))
         return promise;

     WebCryptoAlgorithm algorithm;
     if (!parseAlgorithm(rawAlgorithm, WebCryptoOperationImportKey, algorithm, result))
         return promise;

     const unsigned char* ptr = nullptr;
     unsigned len = 0;

     CString jsonUtf8;
     if (keyData.isArrayBuffer()) {
         ptr = static_cast<const unsigned char*>(keyData.getAsArrayBuffer()->data());
         len = keyData.getAsArrayBuffer()->byteLength();
     } else if (keyData.isArrayBufferView()) {
         ptr = static_cast<const unsigned char*>(keyData.getAsArrayBufferView()->baseAddress());
         len = keyData.getAsArrayBufferView()->byteLength();
     } else if (keyData.isDictionary()) {
         if (!copyJwkDictionaryToJson(keyData.getAsDictionary(), jsonUtf8, result))
             return promise;
         ptr = reinterpret_cast<const unsigned char*>(jsonUtf8.data());
         len = jsonUtf8.length();
     }
     histogramAlgorithm(scriptState->getExecutionContext(), algorithm);
     Platform::current()->crypto()->importKey(format, ptr, len, algorithm, extractable, keyUsages, result->result());
     return promise;
 }

 ScriptPromise SubtleCrypto::exportKey(ScriptState* scriptState, const String& rawFormat, CryptoKey* key)
 {
     CryptoResultImpl* result = CryptoResultImpl::create(scriptState);
     ScriptPromise promise = result->promise();

     if (!canAccessWebCrypto(scriptState, result))
         return promise;

     WebCryptoKeyFormat format;
     if (!CryptoKey::parseFormat(rawFormat, format, result))
         return promise;

     if (!key->extractable()) {
         result->completeWithError(WebCryptoErrorTypeInvalidAccess, "key is not extractable");
         return promise;
     }

     histogramKey(scriptState->getExecutionContext(), key->key());
     Platform::current()->crypto()->exportKey(format, key->key(), result->result());
     return promise;
 }

 ScriptPromise SubtleCrypto::wrapKey(ScriptState* scriptState, const String& rawFormat, CryptoKey* key, CryptoKey* wrappingKey, const AlgorithmIdentifier& rawWrapAlgorithm)
 {
     CryptoResultImpl* result = CryptoResultImpl::create(scriptState);
     ScriptPromise promise = result->promise();

     if (!canAccessWebCrypto(scriptState, result))
         return promise;

     WebCryptoKeyFormat format;
     if (!CryptoKey::parseFormat(rawFormat, format, result))
         return promise;

     WebCryptoAlgorithm wrapAlgorithm;
     if (!parseAlgorithm(rawWrapAlgorithm, WebCryptoOperationWrapKey, wrapAlgorithm, result))
         return promise;

     if (!key->extractable()) {
         result->completeWithError(WebCryptoErrorTypeInvalidAccess, "key is not extractable");
         return promise;
     }

     if (!wrappingKey->canBeUsedForAlgorithm(wrapAlgorithm, WebCryptoKeyUsageWrapKey, result))
         return promise;

     histogramAlgorithmAndKey(scriptState->getExecutionContext(), wrapAlgorithm, wrappingKey->key());
     histogramKey(scriptState->getExecutionContext(), key->key());
     Platform::current()->crypto()->wrapKey(format, key->key(), wrappingKey->key(), wrapAlgorithm, result->result());
     return promise;
 }

 ScriptPromise SubtleCrypto::unwrapKey(ScriptState* scriptState, const String& rawFormat, const DOMArrayPiece& wrappedKey, CryptoKey* unwrappingKey, const AlgorithmIdentifier& rawUnwrapAlgorithm, const AlgorithmIdentifier& rawUnwrappedKeyAlgorithm, bool extractable, const Vector<String>& rawKeyUsages)
 {
     CryptoResultImpl* result = CryptoResultImpl::create(scriptState);
     ScriptPromise promise = result->promise();

     if (!canAccessWebCrypto(scriptState, result))
         return promise;

     WebCryptoKeyFormat format;
     if (!CryptoKey::parseFormat(rawFormat, format, result))
         return promise;

     WebCryptoKeyUsageMask keyUsages;
     if (!CryptoKey::parseUsageMask(rawKeyUsages, keyUsages, result))
         return promise;

     WebCryptoAlgorithm unwrapAlgorithm;
     if (!parseAlgorithm(rawUnwrapAlgorithm, WebCryptoOperationUnwrapKey, unwrapAlgorithm, result))
         return promise;

     WebCryptoAlgorithm unwrappedKeyAlgorithm;
     if (!parseAlgorithm(rawUnwrappedKeyAlgorithm, WebCryptoOperationImportKey, unwrappedKeyAlgorithm, result))
         return promise;

     if (!unwrappingKey->canBeUsedForAlgorithm(unwrapAlgorithm, WebCryptoKeyUsageUnwrapKey, result))
         return promise;

     histogramAlgorithmAndKey(scriptState->getExecutionContext(), unwrapAlgorithm, unwrappingKey->key());
     histogramAlgorithm(scriptState->getExecutionContext(), unwrappedKeyAlgorithm);
     Platform::current()->crypto()->unwrapKey(format, wrappedKey.bytes(), wrappedKey.byteLength(), unwrappingKey->key(), unwrapAlgorithm, unwrappedKeyAlgorithm, extractable, keyUsages, result->result());
     return promise;
 }

 ScriptPromise SubtleCrypto::deriveBits(ScriptState* scriptState, const AlgorithmIdentifier& rawAlgorithm, CryptoKey* baseKey, unsigned lengthBits)
 {
     CryptoResultImpl* result = CryptoResultImpl::create(scriptState);
     ScriptPromise promise = result->promise();

     if (!canAccessWebCrypto(scriptState, result))
         return promise;

     WebCryptoAlgorithm algorithm;
     if (!parseAlgorithm(rawAlgorithm, WebCryptoOperationDeriveBits, algorithm, result))
         return promise;

     if (!baseKey->canBeUsedForAlgorithm(algorithm, WebCryptoKeyUsageDeriveBits, result))
         return promise;

     histogramAlgorithmAndKey(scriptState->getExecutionContext(), algorithm, baseKey->key());
     Platform::current()->crypto()->deriveBits(algorithm, baseKey->key(), lengthBits, result->result());
     return promise;
 }

 ScriptPromise SubtleCrypto::deriveKey(ScriptState* scriptState, const AlgorithmIdentifier& rawAlgorithm, CryptoKey* baseKey, const AlgorithmIdentifier& rawDerivedKeyType, bool extractable, const Vector<String>& rawKeyUsages)
 {
     CryptoResultImpl* result = CryptoResultImpl::create(scriptState);
     ScriptPromise promise = result->promise();

     if (!canAccessWebCrypto(scriptState, result))
         return promise;

     WebCryptoKeyUsageMask keyUsages;
     if (!CryptoKey::parseUsageMask(rawKeyUsages, keyUsages, result))
         return promise;

     WebCryptoAlgorithm algorithm;
     if (!parseAlgorithm(rawAlgorithm, WebCryptoOperationDeriveBits, algorithm, result))
         return promise;

     if (!baseKey->canBeUsedForAlgorithm(algorithm, WebCryptoKeyUsageDeriveKey, result))
         return promise;

     WebCryptoAlgorithm importAlgorithm;
     if (!parseAlgorithm(rawDerivedKeyType, WebCryptoOperationImportKey, importAlgorithm, result))
         return promise;

     WebCryptoAlgorithm keyLengthAlgorithm;
     if (!parseAlgorithm(rawDerivedKeyType, WebCryptoOperationGetKeyLength, keyLengthAlgorithm, result))
         return promise;

     histogramAlgorithmAndKey(scriptState->getExecutionContext(), algorithm, baseKey->key());
     histogramAlgorithm(scriptState->getExecutionContext(), importAlgorithm);
     Platform::current()->crypto()->deriveKey(algorithm, baseKey->key(), importAlgorithm, keyLengthAlgorithm, extractable, keyUsages, result->result());
     return promise;
 }

 } // namespace blink
	/*
	* Copyright (C) 2013 Google Inc. 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 with the
	* distribution.
	* * Neither the name of Google Inc. nor the names of its
	* contributors may be used to endorse or promote products derived from
	* this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/

	#include "modules/crypto/SubtleCrypto.h"

	#include "bindings/core/v8/Dictionary.h"
	#include "core/dom/ExecutionContext.h"
	#include "modules/crypto/CryptoHistograms.h"
	#include "modules/crypto/CryptoKey.h"
	#include "modules/crypto/CryptoResultImpl.h"
	#include "modules/crypto/NormalizeAlgorithm.h"
	#include "platform/JSONValues.h"
	#include "public/platform/Platform.h"
	#include "public/platform/WebCrypto.h"
	#include "public/platform/WebCryptoAlgorithm.h"

	namespace blink {

	static bool parseAlgorithm(const AlgorithmIdentifier& raw, WebCryptoOperation op, WebCryptoAlgorithm& algorithm, CryptoResult* result)
	{
	AlgorithmError error;
	bool success = normalizeAlgorithm(raw, op, algorithm, &error);
	if (!success)
	result->completeWithError(error.errorType, error.errorDetails);
	return success;
	}

	static bool canAccessWebCrypto(ScriptState* scriptState, CryptoResult* result)
	{
	String errorMessage;
	if (!scriptState->getExecutionContext()->isSecureContext(errorMessage, ExecutionContext::WebCryptoSecureContextCheck)) {
	result->completeWithError(WebCryptoErrorTypeNotSupported, errorMessage);
	return false;
	}

	return true;
	}

	static bool copyStringProperty(const char* property, const Dictionary& source, JSONObject* destination)
	{
	String value;
	if (!DictionaryHelper::get(source, property, value))
	return false;
	destination->setString(property, value);
	return true;
	}

	static bool copySequenceOfStringProperty(const char* property, const Dictionary& source, JSONObject* destination)
	{
	Vector<String> value;
	if (!DictionaryHelper::get(source, property, value))
	return false;
	RefPtr<JSONArray> jsonArray = JSONArray::create();
	for (unsigned i = 0; i < value.size(); ++i)
	jsonArray->pushString(value[i]);
	destination->setArray(property, jsonArray.release());
	return true;
	}

	// FIXME: At the time of writing this is not a part of the spec. It is based an
	// an unpublished editor's draft for:
	// https://www.w3.org/Bugs/Public/show_bug.cgi?id=24963
	// See http://crbug.com/373917.
	static bool copyJwkDictionaryToJson(const Dictionary& dict, CString& jsonUtf8, CryptoResult* result)
	{
	RefPtr<JSONObject> jsonObject = JSONObject::create();

	if (!copyStringProperty("kty", dict, jsonObject.get())) {
	result->completeWithError(WebCryptoErrorTypeData, "The required JWK member \"kty\" was missing");
	return false;
	}

	copyStringProperty("use", dict, jsonObject.get());
	copySequenceOfStringProperty("key_ops", dict, jsonObject.get());
	copyStringProperty("alg", dict, jsonObject.get());

	bool ext;
	if (DictionaryHelper::get(dict, "ext", ext))
	jsonObject->setBoolean("ext", ext);

	const char* const propertyNames[] = { "d", "n", "e", "p", "q", "dp", "dq", "qi", "k", "crv", "x", "y" };
	for (unsigned i = 0; i < WTF_ARRAY_LENGTH(propertyNames); ++i)
	copyStringProperty(propertyNames[i], dict, jsonObject.get());

	String json = jsonObject->toJSONString();
	jsonUtf8 = json.utf8();
	return true;
	}

	SubtleCrypto::SubtleCrypto()
	{
	}

	ScriptPromise SubtleCrypto::encrypt(ScriptState* scriptState, const AlgorithmIdentifier& rawAlgorithm, CryptoKey* key, const DOMArrayPiece& data)
	{
	CryptoResultImpl* result = CryptoResultImpl::create(scriptState);
	ScriptPromise promise = result->promise();

	if (!canAccessWebCrypto(scriptState, result))
	return promise;

	WebCryptoAlgorithm algorithm;
	if (!parseAlgorithm(rawAlgorithm, WebCryptoOperationEncrypt, algorithm, result))
	return promise;

	if (!key->canBeUsedForAlgorithm(algorithm, WebCryptoKeyUsageEncrypt, result))
	return promise;

	histogramAlgorithmAndKey(scriptState->getExecutionContext(), algorithm, key->key());
	Platform::current()->crypto()->encrypt(algorithm, key->key(), data.bytes(), data.byteLength(), result->result());
	return promise;
	}

	ScriptPromise SubtleCrypto::decrypt(ScriptState* scriptState, const AlgorithmIdentifier& rawAlgorithm, CryptoKey* key, const DOMArrayPiece& data)
	{
	CryptoResultImpl* result = CryptoResultImpl::create(scriptState);
	ScriptPromise promise = result->promise();

	if (!canAccessWebCrypto(scriptState, result))
	return promise;

	WebCryptoAlgorithm algorithm;
	if (!parseAlgorithm(rawAlgorithm, WebCryptoOperationDecrypt, algorithm, result))
	return promise;

	if (!key->canBeUsedForAlgorithm(algorithm, WebCryptoKeyUsageDecrypt, result))
	return promise;

	histogramAlgorithmAndKey(scriptState->getExecutionContext(), algorithm, key->key());
	Platform::current()->crypto()->decrypt(algorithm, key->key(), data.bytes(), data.byteLength(), result->result());
	return promise;
	}

	ScriptPromise SubtleCrypto::sign(ScriptState* scriptState, const AlgorithmIdentifier& rawAlgorithm, CryptoKey* key, const DOMArrayPiece& data)
	{
	CryptoResultImpl* result = CryptoResultImpl::create(scriptState);
	ScriptPromise promise = result->promise();

	if (!canAccessWebCrypto(scriptState, result))
	return promise;

	WebCryptoAlgorithm algorithm;
	if (!parseAlgorithm(rawAlgorithm, WebCryptoOperationSign, algorithm, result))
	return promise;

	if (!key->canBeUsedForAlgorithm(algorithm, WebCryptoKeyUsageSign, result))
	return promise;

	histogramAlgorithmAndKey(scriptState->getExecutionContext(), algorithm, key->key());
	Platform::current()->crypto()->sign(algorithm, key->key(), data.bytes(), data.byteLength(), result->result());
	return promise;
	}

	ScriptPromise SubtleCrypto::verifySignature(ScriptState* scriptState, const AlgorithmIdentifier& rawAlgorithm, CryptoKey* key, const DOMArrayPiece& signature, const DOMArrayPiece& data)
	{
	CryptoResultImpl* result = CryptoResultImpl::create(scriptState);
	ScriptPromise promise = result->promise();

	if (!canAccessWebCrypto(scriptState, result))
	return promise;

	WebCryptoAlgorithm algorithm;
	if (!parseAlgorithm(rawAlgorithm, WebCryptoOperationVerify, algorithm, result))
	return promise;

	if (!key->canBeUsedForAlgorithm(algorithm, WebCryptoKeyUsageVerify, result))
	return promise;

	histogramAlgorithmAndKey(scriptState->getExecutionContext(), algorithm, key->key());
	Platform::current()->crypto()->verifySignature(algorithm, key->key(), signature.bytes(), signature.byteLength(), data.bytes(), data.byteLength(), result->result());
	return promise;
	}

	ScriptPromise SubtleCrypto::digest(ScriptState* scriptState, const AlgorithmIdentifier& rawAlgorithm, const DOMArrayPiece& data)
	{
	CryptoResultImpl* result = CryptoResultImpl::create(scriptState);
	ScriptPromise promise = result->promise();

	if (!canAccessWebCrypto(scriptState, result))
	return promise;

	WebCryptoAlgorithm algorithm;
	if (!parseAlgorithm(rawAlgorithm, WebCryptoOperationDigest, algorithm, result))
	return promise;

	histogramAlgorithm(scriptState->getExecutionContext(), algorithm);
	Platform::current()->crypto()->digest(algorithm, data.bytes(), data.byteLength(), result->result());
	return promise;
	}

	ScriptPromise SubtleCrypto::generateKey(ScriptState* scriptState, const AlgorithmIdentifier& rawAlgorithm, bool extractable, const Vector<String>& rawKeyUsages)
	{
	CryptoResultImpl* result = CryptoResultImpl::create(scriptState);
	ScriptPromise promise = result->promise();

	if (!canAccessWebCrypto(scriptState, result))
	return promise;

	WebCryptoKeyUsageMask keyUsages;
	if (!CryptoKey::parseUsageMask(rawKeyUsages, keyUsages, result))
	return promise;

	WebCryptoAlgorithm algorithm;
	if (!parseAlgorithm(rawAlgorithm, WebCryptoOperationGenerateKey, algorithm, result))
	return promise;

	histogramAlgorithm(scriptState->getExecutionContext(), algorithm);
	Platform::current()->crypto()->generateKey(algorithm, extractable, keyUsages, result->result());
	return promise;
	}

	ScriptPromise SubtleCrypto::importKey(ScriptState* scriptState, const String& rawFormat, const ArrayBufferOrArrayBufferViewOrDictionary& keyData, const AlgorithmIdentifier& rawAlgorithm, bool extractable, const Vector<String>& rawKeyUsages)
	{
	CryptoResultImpl* result = CryptoResultImpl::create(scriptState);
	ScriptPromise promise = result->promise();

	if (!canAccessWebCrypto(scriptState, result))
	return promise;

	WebCryptoKeyFormat format;
	if (!CryptoKey::parseFormat(rawFormat, format, result))
	return promise;

	if (keyData.isDictionary()) {
	if (format != WebCryptoKeyFormatJwk) {
	result->completeWithError(WebCryptoErrorTypeData, "Key data must be a buffer for non-JWK formats");
	return promise;
	}
	} else if (format == WebCryptoKeyFormatJwk) {
	result->completeWithError(WebCryptoErrorTypeData, "Key data must be an object for JWK import");
	return promise;
	}

	WebCryptoKeyUsageMask keyUsages;
	if (!CryptoKey::parseUsageMask(rawKeyUsages, keyUsages, result))
	return promise;

	WebCryptoAlgorithm algorithm;
	if (!parseAlgorithm(rawAlgorithm, WebCryptoOperationImportKey, algorithm, result))
	return promise;

	const unsigned char* ptr = nullptr;
	unsigned len = 0;

	CString jsonUtf8;
	if (keyData.isArrayBuffer()) {
	ptr = static_cast<const unsigned char*>(keyData.getAsArrayBuffer()->data());
	len = keyData.getAsArrayBuffer()->byteLength();
	} else if (keyData.isArrayBufferView()) {
	ptr = static_cast<const unsigned char*>(keyData.getAsArrayBufferView()->baseAddress());
	len = keyData.getAsArrayBufferView()->byteLength();
	} else if (keyData.isDictionary()) {
	if (!copyJwkDictionaryToJson(keyData.getAsDictionary(), jsonUtf8, result))
	return promise;
	ptr = reinterpret_cast<const unsigned char*>(jsonUtf8.data());
	len = jsonUtf8.length();
	}
	histogramAlgorithm(scriptState->getExecutionContext(), algorithm);
	Platform::current()->crypto()->importKey(format, ptr, len, algorithm, extractable, keyUsages, result->result());
	return promise;
	}

	ScriptPromise SubtleCrypto::exportKey(ScriptState* scriptState, const String& rawFormat, CryptoKey* key)
	{
	CryptoResultImpl* result = CryptoResultImpl::create(scriptState);
	ScriptPromise promise = result->promise();

	if (!canAccessWebCrypto(scriptState, result))
	return promise;

	WebCryptoKeyFormat format;
	if (!CryptoKey::parseFormat(rawFormat, format, result))
	return promise;

	if (!key->extractable()) {
	result->completeWithError(WebCryptoErrorTypeInvalidAccess, "key is not extractable");
	return promise;
	}

	histogramKey(scriptState->getExecutionContext(), key->key());
	Platform::current()->crypto()->exportKey(format, key->key(), result->result());
	return promise;
	}

	ScriptPromise SubtleCrypto::wrapKey(ScriptState* scriptState, const String& rawFormat, CryptoKey* key, CryptoKey* wrappingKey, const AlgorithmIdentifier& rawWrapAlgorithm)
	{
	CryptoResultImpl* result = CryptoResultImpl::create(scriptState);
	ScriptPromise promise = result->promise();

	if (!canAccessWebCrypto(scriptState, result))
	return promise;

	WebCryptoKeyFormat format;
	if (!CryptoKey::parseFormat(rawFormat, format, result))
	return promise;

	WebCryptoAlgorithm wrapAlgorithm;
	if (!parseAlgorithm(rawWrapAlgorithm, WebCryptoOperationWrapKey, wrapAlgorithm, result))
	return promise;

	if (!key->extractable()) {
	result->completeWithError(WebCryptoErrorTypeInvalidAccess, "key is not extractable");
	return promise;
	}

	if (!wrappingKey->canBeUsedForAlgorithm(wrapAlgorithm, WebCryptoKeyUsageWrapKey, result))
	return promise;

	histogramAlgorithmAndKey(scriptState->getExecutionContext(), wrapAlgorithm, wrappingKey->key());
	histogramKey(scriptState->getExecutionContext(), key->key());
	Platform::current()->crypto()->wrapKey(format, key->key(), wrappingKey->key(), wrapAlgorithm, result->result());
	return promise;
	}

	ScriptPromise SubtleCrypto::unwrapKey(ScriptState* scriptState, const String& rawFormat, const DOMArrayPiece& wrappedKey, CryptoKey* unwrappingKey, const AlgorithmIdentifier& rawUnwrapAlgorithm, const AlgorithmIdentifier& rawUnwrappedKeyAlgorithm, bool extractable, const Vector<String>& rawKeyUsages)
	{
	CryptoResultImpl* result = CryptoResultImpl::create(scriptState);
	ScriptPromise promise = result->promise();

	if (!canAccessWebCrypto(scriptState, result))
	return promise;

	WebCryptoKeyFormat format;
	if (!CryptoKey::parseFormat(rawFormat, format, result))
	return promise;

	WebCryptoKeyUsageMask keyUsages;
	if (!CryptoKey::parseUsageMask(rawKeyUsages, keyUsages, result))
	return promise;

	WebCryptoAlgorithm unwrapAlgorithm;
	if (!parseAlgorithm(rawUnwrapAlgorithm, WebCryptoOperationUnwrapKey, unwrapAlgorithm, result))
	return promise;

	WebCryptoAlgorithm unwrappedKeyAlgorithm;
	if (!parseAlgorithm(rawUnwrappedKeyAlgorithm, WebCryptoOperationImportKey, unwrappedKeyAlgorithm, result))
	return promise;

	if (!unwrappingKey->canBeUsedForAlgorithm(unwrapAlgorithm, WebCryptoKeyUsageUnwrapKey, result))
	return promise;

	histogramAlgorithmAndKey(scriptState->getExecutionContext(), unwrapAlgorithm, unwrappingKey->key());
	histogramAlgorithm(scriptState->getExecutionContext(), unwrappedKeyAlgorithm);
	Platform::current()->crypto()->unwrapKey(format, wrappedKey.bytes(), wrappedKey.byteLength(), unwrappingKey->key(), unwrapAlgorithm, unwrappedKeyAlgorithm, extractable, keyUsages, result->result());
	return promise;
	}

	ScriptPromise SubtleCrypto::deriveBits(ScriptState* scriptState, const AlgorithmIdentifier& rawAlgorithm, CryptoKey* baseKey, unsigned lengthBits)
	{
	CryptoResultImpl* result = CryptoResultImpl::create(scriptState);
	ScriptPromise promise = result->promise();

	if (!canAccessWebCrypto(scriptState, result))
	return promise;

	WebCryptoAlgorithm algorithm;
	if (!parseAlgorithm(rawAlgorithm, WebCryptoOperationDeriveBits, algorithm, result))
	return promise;

	if (!baseKey->canBeUsedForAlgorithm(algorithm, WebCryptoKeyUsageDeriveBits, result))
	return promise;

	histogramAlgorithmAndKey(scriptState->getExecutionContext(), algorithm, baseKey->key());
	Platform::current()->crypto()->deriveBits(algorithm, baseKey->key(), lengthBits, result->result());
	return promise;
	}

	ScriptPromise SubtleCrypto::deriveKey(ScriptState* scriptState, const AlgorithmIdentifier& rawAlgorithm, CryptoKey* baseKey, const AlgorithmIdentifier& rawDerivedKeyType, bool extractable, const Vector<String>& rawKeyUsages)
	{
	CryptoResultImpl* result = CryptoResultImpl::create(scriptState);
	ScriptPromise promise = result->promise();

	if (!canAccessWebCrypto(scriptState, result))
	return promise;

	WebCryptoKeyUsageMask keyUsages;
	if (!CryptoKey::parseUsageMask(rawKeyUsages, keyUsages, result))
	return promise;

	WebCryptoAlgorithm algorithm;
	if (!parseAlgorithm(rawAlgorithm, WebCryptoOperationDeriveBits, algorithm, result))
	return promise;

	if (!baseKey->canBeUsedForAlgorithm(algorithm, WebCryptoKeyUsageDeriveKey, result))
	return promise;

	WebCryptoAlgorithm importAlgorithm;
	if (!parseAlgorithm(rawDerivedKeyType, WebCryptoOperationImportKey, importAlgorithm, result))
	return promise;

	WebCryptoAlgorithm keyLengthAlgorithm;
	if (!parseAlgorithm(rawDerivedKeyType, WebCryptoOperationGetKeyLength, keyLengthAlgorithm, result))
	return promise;

	histogramAlgorithmAndKey(scriptState->getExecutionContext(), algorithm, baseKey->key());
	histogramAlgorithm(scriptState->getExecutionContext(), importAlgorithm);
	Platform::current()->crypto()->deriveKey(algorithm, baseKey->key(), importAlgorithm, keyLengthAlgorithm, extractable, keyUsages, result->result());
	return promise;
	}

	} // namespace blink