root/Source/modules/crypto/Crypto.cpp

DEFINITIONS

1. isIntegerArray
2. getRandomValues
3. subtle
4. trace

/*
 * Copyright (C) 2011 Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions
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 *
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 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY GOOGLE AND ITS 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
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#include "config.h"
#include "modules/crypto/Crypto.h"

#include "bindings/v8/ExceptionState.h"
#include "core/dom/ExceptionCode.h"
#include "wtf/ArrayBufferView.h"
#include "wtf/CryptographicallyRandomNumber.h"

namespace WebCore {

namespace {

bool isIntegerArray(ArrayBufferView* array)
{
    ArrayBufferView::ViewType type = array->type();
    return type == ArrayBufferView::TypeInt8
        || type == ArrayBufferView::TypeUint8
        || type == ArrayBufferView::TypeUint8Clamped
        || type == ArrayBufferView::TypeInt16
        || type == ArrayBufferView::TypeUint16
        || type == ArrayBufferView::TypeInt32
        || type == ArrayBufferView::TypeUint32;
}

}

Crypto::Crypto()
{
    ScriptWrappable::init(this);
}

void Crypto::getRandomValues(ArrayBufferView* array, ExceptionState& exceptionState)
{
    if (!array) {
        exceptionState.throwDOMException(TypeMismatchError, "The provided ArrayBufferView is null.");
        return;
    }
    if (!isIntegerArray(array)) {
        exceptionState.throwDOMException(TypeMismatchError, String::format("The provided ArrayBufferView is of type '%s', which is not an integer array type.", array->typeName()));
        return;
    }
    if (array->byteLength() > 65536) {
        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()));
        return;
    }
    cryptographicallyRandomValues(array->baseAddress(), array->byteLength());
}

SubtleCrypto* Crypto::subtle()
{
    if (!m_subtleCrypto)
        m_subtleCrypto = SubtleCrypto::create();
    return m_subtleCrypto.get();
}

void Crypto::trace(Visitor* visitor)
{
    visitor->trace(m_subtleCrypto);
}

}