1/*
2 * Copyright (C) 2014 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 are
6 * met:
7 *
8 *     * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *     * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 *     * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#include "config.h"
32#include "public/platform/WebCryptoKeyAlgorithm.h"
33
34#include "wtf/OwnPtr.h"
35#include "wtf/ThreadSafeRefCounted.h"
36
37namespace blink {
38
39// FIXME: Remove the need for this.
40WebCryptoAlgorithm createHash(WebCryptoAlgorithmId hash)
41{
42    return WebCryptoAlgorithm::adoptParamsAndCreate(hash, 0);
43}
44
45class WebCryptoKeyAlgorithmPrivate : public ThreadSafeRefCounted<WebCryptoKeyAlgorithmPrivate> {
46public:
47    WebCryptoKeyAlgorithmPrivate(WebCryptoAlgorithmId id, PassOwnPtr<WebCryptoKeyAlgorithmParams> params)
48        : id(id)
49        , params(params)
50    {
51    }
52
53    WebCryptoAlgorithmId id;
54    OwnPtr<WebCryptoKeyAlgorithmParams> params;
55};
56
57WebCryptoKeyAlgorithm::WebCryptoKeyAlgorithm(WebCryptoAlgorithmId id, PassOwnPtr<WebCryptoKeyAlgorithmParams> params)
58    : m_private(adoptRef(new WebCryptoKeyAlgorithmPrivate(id, params)))
59{
60}
61
62WebCryptoKeyAlgorithm WebCryptoKeyAlgorithm::adoptParamsAndCreate(WebCryptoAlgorithmId id, WebCryptoKeyAlgorithmParams* params)
63{
64    return WebCryptoKeyAlgorithm(id, adoptPtr(params));
65}
66
67WebCryptoKeyAlgorithm WebCryptoKeyAlgorithm::createAes(WebCryptoAlgorithmId id, unsigned short keyLengthBits)
68{
69    // FIXME: Verify that id is an AES algorithm.
70    // FIXME: Move this somewhere more general.
71    if (keyLengthBits != 128 && keyLengthBits != 192 && keyLengthBits != 256)
72        return WebCryptoKeyAlgorithm();
73    return WebCryptoKeyAlgorithm(id, adoptPtr(new WebCryptoAesKeyAlgorithmParams(keyLengthBits)));
74}
75
76WebCryptoKeyAlgorithm WebCryptoKeyAlgorithm::createHmac(WebCryptoAlgorithmId hash, unsigned keyLengthBits)
77{
78    if (!WebCryptoAlgorithm::isHash(hash))
79        return WebCryptoKeyAlgorithm();
80    return WebCryptoKeyAlgorithm(WebCryptoAlgorithmIdHmac, adoptPtr(new WebCryptoHmacKeyAlgorithmParams(createHash(hash), keyLengthBits)));
81}
82
83WebCryptoKeyAlgorithm WebCryptoKeyAlgorithm::createRsaHashed(WebCryptoAlgorithmId id, unsigned modulusLengthBits, const unsigned char* publicExponent, unsigned publicExponentSize, WebCryptoAlgorithmId hash)
84{
85    // FIXME: Verify that id is an RSA algorithm which expects a hash
86    if (!WebCryptoAlgorithm::isHash(hash))
87        return WebCryptoKeyAlgorithm();
88    return WebCryptoKeyAlgorithm(id, adoptPtr(new WebCryptoRsaHashedKeyAlgorithmParams(modulusLengthBits, publicExponent, publicExponentSize, createHash(hash))));
89}
90
91bool WebCryptoKeyAlgorithm::isNull() const
92{
93    return m_private.isNull();
94}
95
96WebCryptoAlgorithmId WebCryptoKeyAlgorithm::id() const
97{
98    ASSERT(!isNull());
99    return m_private->id;
100}
101
102WebCryptoKeyAlgorithmParamsType WebCryptoKeyAlgorithm::paramsType() const
103{
104    ASSERT(!isNull());
105    if (!m_private->params.get())
106        return WebCryptoKeyAlgorithmParamsTypeNone;
107    return m_private->params->type();
108}
109
110WebCryptoAesKeyAlgorithmParams* WebCryptoKeyAlgorithm::aesParams() const
111{
112    ASSERT(!isNull());
113    if (paramsType() == WebCryptoKeyAlgorithmParamsTypeAes)
114        return static_cast<WebCryptoAesKeyAlgorithmParams*>(m_private->params.get());
115    return 0;
116}
117
118WebCryptoHmacKeyAlgorithmParams* WebCryptoKeyAlgorithm::hmacParams() const
119{
120    ASSERT(!isNull());
121    if (paramsType() == WebCryptoKeyAlgorithmParamsTypeHmac)
122        return static_cast<WebCryptoHmacKeyAlgorithmParams*>(m_private->params.get());
123    return 0;
124}
125
126WebCryptoRsaHashedKeyAlgorithmParams* WebCryptoKeyAlgorithm::rsaHashedParams() const
127{
128    ASSERT(!isNull());
129    if (paramsType() == WebCryptoKeyAlgorithmParamsTypeRsaHashed)
130        return static_cast<WebCryptoRsaHashedKeyAlgorithmParams*>(m_private->params.get());
131    return 0;
132}
133
134void WebCryptoKeyAlgorithm::writeToDictionary(WebCryptoKeyAlgorithmDictionary* dict) const
135{
136    ASSERT(!isNull());
137    dict->setString("name", WebCryptoAlgorithm::lookupAlgorithmInfo(id())->name);
138    m_private->params.get()->writeToDictionary(dict);
139}
140
141void WebCryptoKeyAlgorithm::assign(const WebCryptoKeyAlgorithm& other)
142{
143    m_private = other.m_private;
144}
145
146void WebCryptoKeyAlgorithm::reset()
147{
148    m_private.reset();
149}
150
151} // namespace blink
152