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1 /* |
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2 * Copyright (c) 2003-2009 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 * |
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16 */ |
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17 |
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18 |
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19 #include <asymmetrickeys.h> |
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20 #include <bigint.h> |
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21 |
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22 /* CDHParameters */ |
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23 EXPORT_C const TInteger& CDHParameters::N(void) const |
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24 { |
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25 return iN; |
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26 } |
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27 |
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28 EXPORT_C const TInteger& CDHParameters::G(void) const |
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29 { |
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30 return iG; |
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31 } |
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32 |
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33 EXPORT_C CDHParameters::~CDHParameters(void) |
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34 { |
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35 iN.Close(); |
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36 iG.Close(); |
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37 } |
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38 |
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39 EXPORT_C CDHParameters::CDHParameters(RInteger& aN, RInteger& aG) : iN(aN), iG(aG) |
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40 { |
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41 } |
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42 |
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43 EXPORT_C CDHParameters::CDHParameters(void) |
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44 { |
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45 } |
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46 |
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47 /* CDHPublicKey */ |
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48 EXPORT_C CDHPublicKey* CDHPublicKey::NewL(RInteger& aN, RInteger& aG, |
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49 RInteger& aX) |
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50 { |
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51 CDHPublicKey* self = new(ELeave) CDHPublicKey(aN, aG, aX); |
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52 return self; |
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53 } |
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54 |
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55 EXPORT_C CDHPublicKey* CDHPublicKey::NewLC(RInteger& aN, RInteger& aG, |
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56 RInteger& aX) |
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57 { |
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58 CDHPublicKey* self = NewL(aN, aG, aX); |
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59 CleanupStack::PushL(self); |
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60 return self; |
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61 } |
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62 |
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63 EXPORT_C const TInteger& CDHPublicKey::X(void) const |
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64 { |
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65 return iX; |
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66 } |
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67 |
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68 EXPORT_C CDHPublicKey::CDHPublicKey(RInteger& aN, RInteger& aG, RInteger& aX) |
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69 : CDHParameters(aN, aG), iX(aX) |
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70 { |
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71 } |
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72 |
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73 EXPORT_C CDHPublicKey::CDHPublicKey(void) |
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74 { |
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75 } |
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76 |
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77 EXPORT_C CDHPublicKey::~CDHPublicKey(void) |
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78 { |
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79 iX.Close(); |
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80 } |
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81 |
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82 /* CDHPrivateKey */ |
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83 EXPORT_C CDHPrivateKey* CDHPrivateKey::NewL(RInteger& aN, RInteger& aG, |
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84 RInteger& ax) |
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85 { |
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86 CDHPrivateKey* self = new(ELeave) CDHPrivateKey(aN, aG, ax); |
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87 return self; |
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88 } |
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89 |
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90 EXPORT_C CDHPrivateKey* CDHPrivateKey::NewLC(RInteger& aN, RInteger& aG, |
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91 RInteger& ax) |
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92 { |
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93 CDHPrivateKey* self = NewL(aN, aG, ax); |
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94 CleanupStack::PushL(self); |
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95 return self; |
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96 } |
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97 |
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98 EXPORT_C const TInteger& CDHPrivateKey::x(void) const |
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99 { |
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100 return ix; |
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101 } |
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102 |
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103 EXPORT_C CDHPrivateKey::CDHPrivateKey(RInteger& aN, RInteger& aG, RInteger& ax) |
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104 : CDHParameters(aN, aG), ix(ax) |
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105 { |
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106 } |
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107 |
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108 EXPORT_C CDHPrivateKey::CDHPrivateKey(void) |
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109 { |
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110 } |
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111 |
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112 EXPORT_C CDHPrivateKey::~CDHPrivateKey(void) |
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113 { |
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114 ix.Close(); |
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115 } |
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116 |
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117 /* CDHKeyPair */ |
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118 |
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119 EXPORT_C CDHKeyPair* CDHKeyPair::NewL(RInteger& aN, RInteger& aG) |
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120 { |
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121 CDHKeyPair* self = NewLC(aN, aG); |
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122 CleanupStack::Pop(self); |
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123 return self; |
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124 } |
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125 |
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126 EXPORT_C CDHKeyPair* CDHKeyPair::NewLC(RInteger& aN, RInteger& aG) |
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127 { |
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128 CDHKeyPair* self = new(ELeave) CDHKeyPair(); |
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129 CleanupStack::PushL(self); |
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130 self->ConstructL(aN, aG); |
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131 return self; |
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132 } |
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133 |
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134 EXPORT_C CDHKeyPair* CDHKeyPair::NewL(RInteger& aN, RInteger& aG, RInteger& ax) |
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135 { |
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136 CDHKeyPair* self = NewLC(aN, aG, ax); |
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137 CleanupStack::Pop(self); |
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138 return self; |
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139 } |
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140 |
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141 EXPORT_C CDHKeyPair* CDHKeyPair::NewLC(RInteger& aN, RInteger& aG, RInteger& ax) |
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142 { |
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143 CDHKeyPair* self = new(ELeave) CDHKeyPair(); |
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144 CleanupStack::PushL(self); |
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145 self->ConstructL(aN, aG, ax); |
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146 return self; |
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147 } |
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148 |
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149 EXPORT_C const CDHPublicKey& CDHKeyPair::PublicKey(void) const |
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150 { |
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151 return *iPublic; |
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152 } |
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153 |
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154 EXPORT_C const CDHPrivateKey& CDHKeyPair::PrivateKey(void) const |
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155 { |
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156 return *iPrivate; |
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157 } |
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158 |
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159 EXPORT_C CDHKeyPair::~CDHKeyPair(void) |
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160 { |
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161 delete iPublic; |
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162 delete iPrivate; |
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163 } |
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164 |
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165 EXPORT_C CDHKeyPair::CDHKeyPair(void) |
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166 { |
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167 } |
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168 |
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169 EXPORT_C void CDHKeyPair::ConstructL(RInteger& aN, RInteger& aG) |
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170 { |
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171 //declaring a reference just for clarity in NewRandomL statement |
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172 RInteger& nminus2 = aN; |
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173 --nminus2; |
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174 --nminus2; |
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175 |
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176 //find a random x | 1 <= x <= n-2 |
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177 RInteger x = RInteger::NewRandomL(TInteger::One(), nminus2); |
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178 CleanupStack::PushL(x); |
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179 ++nminus2; |
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180 ++nminus2; // reincrement aN |
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181 |
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182 ConstructL(aN, aG, x); |
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183 |
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184 CleanupStack::Pop(&x); |
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185 } |
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186 |
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187 EXPORT_C void CDHKeyPair::ConstructL(RInteger& aN, RInteger& aG, RInteger& ax) |
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188 { |
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189 //declaring a reference just for clarity in if statements |
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190 RInteger& nminus2 = aN; |
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191 --nminus2; |
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192 --nminus2; |
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193 |
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194 if( aG < TInteger::Two() || aG > nminus2 ) |
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195 { |
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196 User::Leave(KErrArgument); |
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197 } |
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198 //In the case of the other ConstructL calling this function this if |
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199 //statement is redundant. However, we need to check as this is can be |
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200 //called without going through the other api. |
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201 if( ax < TInteger::One() || ax > nminus2 ) |
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202 { |
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203 User::Leave(KErrArgument); |
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204 } |
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205 |
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206 ++nminus2; |
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207 ++nminus2; // reincrement aN |
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208 |
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209 // Calculate X = g^(x) mod n; (note the case sensitivity) |
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210 RInteger X = TInteger::ModularExponentiateL(aG, ax, aN); |
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211 CleanupStack::PushL(X); |
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212 |
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213 RInteger n1 = RInteger::NewL(aN); |
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214 CleanupStack::PushL(n1); |
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215 RInteger g1 = RInteger::NewL(aG); |
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216 CleanupStack::PushL(g1); |
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217 iPublic = CDHPublicKey::NewL(n1, g1, X); |
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218 CleanupStack::Pop(3, &X); // g1, n1, X all owned by iPublic |
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219 |
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220 iPrivate = CDHPrivateKey::NewL(aN, aG, ax); |
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221 } |