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      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 #ifndef WebCryptoKeyAlgorithmParams_h
     32 #define WebCryptoKeyAlgorithmParams_h
     33 
     34 #include "WebCommon.h"
     35 #include "WebCryptoAlgorithm.h"
     36 #include "WebVector.h"
     37 
     38 namespace blink {
     39 
     40 // Interface used for serializing WebCryptoKeyAlgorithmParams to a javascript
     41 // dictionary.
     42 class WebCryptoKeyAlgorithmDictionary {
     43 public:
     44     virtual ~WebCryptoKeyAlgorithmDictionary() { }
     45 
     46     virtual void setString(const char*, const char*) = 0;
     47     virtual void setUint(const char*, unsigned) = 0;
     48     virtual void setAlgorithm(const char*, const WebCryptoAlgorithm&) = 0;
     49     virtual void setUint8Array(const char*, const WebVector<unsigned char>&) = 0;
     50 };
     51 
     52 enum WebCryptoKeyAlgorithmParamsType {
     53     WebCryptoKeyAlgorithmParamsTypeNone,
     54     WebCryptoKeyAlgorithmParamsTypeHmac,
     55     WebCryptoKeyAlgorithmParamsTypeAes,
     56     WebCryptoKeyAlgorithmParamsTypeRsaHashed
     57 };
     58 
     59 class WebCryptoKeyAlgorithmParams {
     60 public:
     61     virtual ~WebCryptoKeyAlgorithmParams() { }
     62     virtual WebCryptoKeyAlgorithmParamsType type() const
     63     {
     64         return WebCryptoKeyAlgorithmParamsTypeNone;
     65     }
     66 
     67     virtual void writeToDictionary(WebCryptoKeyAlgorithmDictionary*) const = 0;
     68 };
     69 
     70 class WebCryptoAesKeyAlgorithmParams : public WebCryptoKeyAlgorithmParams {
     71 public:
     72     explicit WebCryptoAesKeyAlgorithmParams(unsigned short lengthBits)
     73         : m_lengthBits(lengthBits)
     74     {
     75     }
     76 
     77     unsigned short lengthBits() const
     78     {
     79         return m_lengthBits;
     80     }
     81 
     82     virtual WebCryptoKeyAlgorithmParamsType type() const
     83     {
     84         return WebCryptoKeyAlgorithmParamsTypeAes;
     85     }
     86 
     87     virtual void writeToDictionary(WebCryptoKeyAlgorithmDictionary* dict) const
     88     {
     89         dict->setUint("length", m_lengthBits);
     90     }
     91 
     92 private:
     93     unsigned short m_lengthBits;
     94 };
     95 
     96 class WebCryptoHmacKeyAlgorithmParams : public WebCryptoKeyAlgorithmParams {
     97 public:
     98     WebCryptoHmacKeyAlgorithmParams(const WebCryptoAlgorithm& hash, unsigned lengthBits)
     99         : m_hash(hash)
    100         , m_lengthBits(lengthBits)
    101     {
    102     }
    103 
    104     const WebCryptoAlgorithm& hash() const
    105     {
    106         return m_hash;
    107     }
    108 
    109     unsigned lengthBits() const
    110     {
    111         return m_lengthBits;
    112     }
    113 
    114     virtual WebCryptoKeyAlgorithmParamsType type() const
    115     {
    116         return WebCryptoKeyAlgorithmParamsTypeHmac;
    117     }
    118 
    119     virtual void writeToDictionary(WebCryptoKeyAlgorithmDictionary* dict) const
    120     {
    121         dict->setAlgorithm("hash", m_hash);
    122         dict->setUint("length", m_lengthBits);
    123     }
    124 
    125 private:
    126     WebCryptoAlgorithm m_hash;
    127     unsigned m_lengthBits;
    128 };
    129 
    130 class WebCryptoRsaHashedKeyAlgorithmParams : public WebCryptoKeyAlgorithmParams {
    131 public:
    132     WebCryptoRsaHashedKeyAlgorithmParams(unsigned modulusLengthBits, const unsigned char* publicExponent, unsigned publicExponentSize, const WebCryptoAlgorithm& hash)
    133         : m_modulusLengthBits(modulusLengthBits)
    134         , m_publicExponent(publicExponent, publicExponentSize)
    135         , m_hash(hash)
    136     {
    137     }
    138 
    139     unsigned modulusLengthBits() const
    140     {
    141         return m_modulusLengthBits;
    142     }
    143 
    144     const WebVector<unsigned char>& publicExponent() const
    145     {
    146         return m_publicExponent;
    147     }
    148 
    149     const WebCryptoAlgorithm& hash() const
    150     {
    151         return m_hash;
    152     }
    153 
    154     virtual WebCryptoKeyAlgorithmParamsType type() const
    155     {
    156         return WebCryptoKeyAlgorithmParamsTypeRsaHashed;
    157     }
    158 
    159     virtual void writeToDictionary(WebCryptoKeyAlgorithmDictionary* dict) const
    160     {
    161         dict->setAlgorithm("hash", m_hash);
    162         dict->setUint("modulusLength", m_modulusLengthBits);
    163         dict->setUint8Array("publicExponent", m_publicExponent);
    164     }
    165 
    166 private:
    167     unsigned m_modulusLengthBits;
    168     WebVector<unsigned char> m_publicExponent;
    169     WebCryptoAlgorithm m_hash;
    170 };
    171 
    172 } // namespace blink
    173 
    174 #endif
    175