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1 /* |
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2 * Copyright (c) 2002-2009 Nokia Corporation and/or its subsidiary(-ies). |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of the License "Eclipse Public License v1.0" |
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6 * which accompanies this distribution, and is available |
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7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 * |
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9 * Initial Contributors: |
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10 * Nokia Corporation - initial contribution. |
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11 * |
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12 * Contributors: |
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13 * |
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14 * Description: |
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15 * ** IMPORTANT ** PublishedPartner API's in this file are published to 3rd party developers via the |
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16 * Symbian website. Changes to these API's should be treated as PublishedAll API changes and the Security TA should be consulted. |
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17 * RC2 implementation |
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18 * |
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19 */ |
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20 |
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21 |
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22 /** |
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23 @file |
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24 @publishedPartner |
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25 @released |
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26 */ |
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27 |
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28 #ifndef __RC2_H__ |
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29 #define __RC2_H__ |
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30 |
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31 #include <blocktransformation.h> |
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32 |
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33 #ifndef SYMBIAN_ENABLE_SPLIT_HEADERS |
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34 |
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35 /** OpenSSL PKCS8 Effective Key Length Compatibility.*/ |
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36 const TUint KPkcs8CompatibilityBits = 128; |
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37 |
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38 /** PKCS12 PBE Effective Key Length Compatibility.*/ |
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39 const TUint KPkcs12CompatibilityBits = 40; |
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40 |
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41 #endif |
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42 |
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43 /** The expanded key length of an RC2 key.*/ |
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44 const TUint KRC2ExpandedKeyLen = 64; |
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45 |
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46 /** SSL Effective Key Length Compatibility.*/ |
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47 const TUint KSSLCompatibilityBits = 1024; |
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48 |
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49 /** The maximum size in bytes for a RC2 key.*/ |
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50 const TUint KRC2MaxKeySizeBytes = 128; // Max key size in this implementation = 128 bytes |
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51 |
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52 |
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53 /** |
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54 * Abstract base class for RC2 encipherment. |
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55 * |
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56 */ |
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57 class CRC2 : public CBlockTransformation |
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58 { |
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59 public: |
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60 virtual void Reset(); |
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61 virtual TInt BlockSize() const; |
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62 virtual TInt KeySize() const; |
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63 protected: |
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64 /** @internalAll */ |
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65 CRC2(void); |
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66 virtual void SetKey(const TDesC8& aKey, TInt aEffectiveKeyLenBits); |
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67 protected: |
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68 /** |
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69 * The expanded key buffer. |
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70 * |
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71 * Each iK[i] is a 16-bit word. |
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72 */ |
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73 TUint16 iK[KRC2ExpandedKeyLen]; // 128 bytes |
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74 /** |
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75 * The input key |
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76 * |
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77 * The key length must fall between 1 and KRC2MaxKeySizeBytes (=128) bytes inclusive. |
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78 */ |
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79 TBuf8<KRC2MaxKeySizeBytes> iKey; |
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80 /** The effective key length in bits */ |
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81 TInt iEffectiveKeyLenBits; |
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82 }; |
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83 |
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84 /** |
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85 * Concrete class for RC2 encryption. |
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86 * |
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87 */ |
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88 class CRC2Encryptor : public CRC2 |
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89 { |
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90 public: |
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91 /** |
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92 * Creates an instance of this class. |
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93 * |
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94 * @param aKey The key to be used for encryption. The key length must fall between |
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95 * 1 and KRC2MaxKeySizeBytes (=128) bytes inclusive. |
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96 * @param aEffectiveKeyLenBits Effective key length bits |
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97 * (defaults KSSLCompatibilityBits = 1024). |
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98 * |
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99 * @leave KErrKeyNotWeakEnough If the key size is larger than that allowed by the |
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100 * cipher strength restrictions of the crypto library. |
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101 * See TCrypto::IsSymmetricWeakEnoughL() |
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102 */ |
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103 IMPORT_C static CRC2Encryptor* NewL(const TDesC8& aKey, |
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104 TInt aEffectiveKeyLenBits = KSSLCompatibilityBits); |
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105 /** |
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106 * Creates an instance of this class and leaves it on the cleanup stack. |
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107 * |
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108 * @param aKey The key to be used for encryption. The key length must fall between |
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109 * 1 and KRC2MaxKeySizeBytes (=128) bytes inclusive. |
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110 * @param aEffectiveKeyLenBits Effective key length bits |
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111 * (defaults KSSLCompatibilityBits = 1024). |
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112 * |
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113 * @leave KErrKeyNotWeakEnough If the key size is larger than that allowed by the |
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114 * cipher strength restrictions of the crypto library. |
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115 * See TCrypto::IsSymmetricWeakEnoughL() |
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116 */ |
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117 IMPORT_C static CRC2Encryptor* NewLC(const TDesC8& aKey, |
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118 TInt aEffectiveKeyLenBits = KSSLCompatibilityBits); |
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119 virtual void Transform(TDes8& aBlock); |
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120 protected: |
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121 /** @internalAll */ |
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122 CRC2Encryptor(void); |
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123 }; |
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124 |
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125 /** |
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126 * Concrete class for RC2 decryption. |
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127 * |
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128 */ |
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129 class CRC2Decryptor : public CRC2 |
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130 { |
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131 public: |
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132 /** |
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133 * Creates an instance of this class. |
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134 * |
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135 * @param aKey The key to be used for decryption. The key length must fall between |
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136 * 1 and KRC2MaxKeySizeBytes (=128) bytes inclusive. |
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137 * @param aEffectiveKeyLenBits Effective key length bits |
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138 * (defaults KSSLCompatibilityBits = 1024). |
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139 * |
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140 * @leave KErrKeyNotWeakEnough If the key size is larger than that allowed by the |
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141 * cipher strength restrictions of the crypto library. |
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142 * See TCrypto::IsSymmetricWeakEnoughL() |
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143 */ |
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144 IMPORT_C static CRC2Decryptor* NewL(const TDesC8& aKey, |
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145 TInt aEffectiveKeyLenBits = KSSLCompatibilityBits); |
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146 |
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147 /** |
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148 * Creates an instance of this class and leaves it on the cleanup stack. |
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149 * |
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150 * @param aKey The key to be used for decryption. The key length must fall between |
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151 * 1 and KRC2MaxKeySizeBytes (=128) bytes inclusive. |
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152 * @param aEffectiveKeyLenBits Effective key length bits |
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153 * (defaults KSSLCompatibilityBits = 1024). |
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154 * |
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155 * @leave KErrKeyNotWeakEnough If the key size is larger than that allowed by the |
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156 * cipher strength restrictions of the crypto library. |
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157 * See TCrypto::IsSymmetricWeakEnoughL() |
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158 */ |
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159 IMPORT_C static CRC2Decryptor* NewLC(const TDesC8& aKey, |
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160 TInt aEffectiveKeyLenBits = KSSLCompatibilityBits); |
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161 virtual void Transform(TDes8& aBlock); |
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162 protected: |
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163 /** @internalAll */ |
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164 CRC2Decryptor(void); |
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165 |
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166 }; |
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167 |
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168 #endif // __RC2_H__ |