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/core/v8/ExceptionState.h"
34#include "core/dom/ExceptionCode.h"
35#include "wtf/ArrayBufferView.h"
36#include "wtf/CryptographicallyRandomNumber.h"
37
38namespace blink {
39
40namespace {
41
42bool 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
56Crypto::Crypto()
57{
58}
59
60void Crypto::getRandomValues(ArrayBufferView* array, ExceptionState& exceptionState)
61{
62    if (!array) {
63        exceptionState.throwDOMException(TypeMismatchError, "The provided ArrayBufferView is null.");
64        return;
65    }
66    if (!isIntegerArray(array)) {
67        exceptionState.throwDOMException(TypeMismatchError, String::format("The provided ArrayBufferView is of type '%s', which is not an integer array type.", array->typeName()));
68        return;
69    }
70    if (array->byteLength() > 65536) {
71        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()));
72        return;
73    }
74    cryptographicallyRandomValues(array->baseAddress(), array->byteLength());
75}
76
77SubtleCrypto* Crypto::subtle()
78{
79    if (!m_subtleCrypto)
80        m_subtleCrypto = SubtleCrypto::create();
81    return m_subtleCrypto.get();
82}
83
84void Crypto::trace(Visitor* visitor)
85{
86    visitor->trace(m_subtleCrypto);
87}
88
89}
90