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      1 /*
      2  * Copyright (C) 2011 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  *
      8  * 1.  Redistributions of source code must retain the above copyright
      9  *     notice, this list of conditions and the following disclaimer.
     10  * 2.  Redistributions in binary form must reproduce the above copyright
     11  *     notice, this list of conditions and the following disclaimer in the
     12  *     documentation and/or other materials provided with the distribution.
     13  * 3.  Neither the name of Google, Inc. ("Google") nor the names of
     14  *     its contributors may be used to endorse or promote products derived
     15  *     from this software without specific prior written permission.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY GOOGLE AND ITS CONTRIBUTORS "AS IS" AND ANY
     18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     20  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 
     30 #include "config.h"
     31 #include "modules/crypto/Crypto.h"
     32 
     33 #include "bindings/v8/ExceptionState.h"
     34 #include "core/dom/ExceptionCode.h"
     35 #include "wtf/ArrayBufferView.h"
     36 #include "wtf/CryptographicallyRandomNumber.h"
     37 
     38 namespace WebCore {
     39 
     40 namespace {
     41 
     42 bool isIntegerArray(ArrayBufferView* array)
     43 {
     44     ArrayBufferView::ViewType type = array->type();
     45     return type == ArrayBufferView::TypeInt8
     46         || type == ArrayBufferView::TypeUint8
     47         || type == ArrayBufferView::TypeUint8Clamped
     48         || type == ArrayBufferView::TypeInt16
     49         || type == ArrayBufferView::TypeUint16
     50         || type == ArrayBufferView::TypeInt32
     51         || type == ArrayBufferView::TypeUint32;
     52 }
     53 
     54 }
     55 
     56 Crypto::Crypto()
     57 {
     58     ScriptWrappable::init(this);
     59 }
     60 
     61 void Crypto::getRandomValues(ArrayBufferView* array, ExceptionState& exceptionState)
     62 {
     63     if (!array) {
     64         exceptionState.throwDOMException(TypeMismatchError, "The provided ArrayBufferView is null.");
     65         return;
     66     }
     67     if (!isIntegerArray(array)) {
     68         exceptionState.throwDOMException(TypeMismatchError, String::format("The provided ArrayBufferView is of type '%s', which is not an integer array type.", array->typeName()));
     69         return;
     70     }
     71     if (array->byteLength() > 65536) {
     72         exceptionState.throwDOMException(QuotaExceededError, String::format("The ArrayBufferView's byte length (%u) exceeds the number of bytes of entropy available via this API (65536).", array->byteLength()));
     73         return;
     74     }
     75     cryptographicallyRandomValues(array->baseAddress(), array->byteLength());
     76 }
     77 
     78 SubtleCrypto* Crypto::subtle()
     79 {
     80     if (!m_subtleCrypto)
     81         m_subtleCrypto = SubtleCrypto::create();
     82     return m_subtleCrypto.get();
     83 }
     84 
     85 void Crypto::trace(Visitor* visitor)
     86 {
     87     visitor->trace(m_subtleCrypto);
     88 }
     89 
     90 }
     91