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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 * RSAFunction class implementation |
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16 * |
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17 */ |
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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 @internalTechnology |
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25 */ |
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26 |
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27 #ifndef __RSAFUNCTION_H__ |
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28 #define __RSAFUNCTION_H__ |
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29 |
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30 #include <e32base.h> |
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31 |
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32 class TInteger; |
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33 |
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34 class CRSAPublicKey; |
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35 class CRSAPrivateKey; |
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36 class CRSAPrivateKeyCRT; |
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37 |
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38 class RSAFunction |
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39 { |
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40 public: |
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41 static inline TBool IsInputValid(const TInteger& aInput, |
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42 const TInteger& aModulus); |
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43 static inline void IsInputValidL(const TInteger& aInput, |
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44 const TInteger& aModulus); |
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45 static void EncryptL(const CRSAPublicKey& aPublicKey, |
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46 const TInteger& aInput, RInteger& aOutput); |
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47 static void DecryptL(const CRSAPrivateKey& aPrivateKey, |
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48 const TInteger& aInput, RInteger& aOutput); |
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49 static void SignL(const CRSAPrivateKey& aPrivateKey, |
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50 const TInteger& aInput, RInteger& aOutput); |
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51 static void VerifyL(const CRSAPublicKey& aPublicKey, |
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52 const TInteger& aInput, RInteger& aOutput); |
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53 private: |
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54 static void FunctionL(const TInteger& aModulus, const TInteger& aExponent, |
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55 const TInteger& aBase, RInteger& aOutput); |
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56 static void FunctionCRTL(const CRSAPrivateKeyCRT& aPrivateKey, |
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57 const TInteger& aInput, RInteger& aOutput); |
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58 private: |
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59 RSAFunction(void); |
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60 }; |
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61 |
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62 /** Computes whether a given message representative is within the valid bounds |
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63 * for a given modulus, i.e. whether the message is representative within [0,n-1]. |
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64 * @param aInput The message representative. |
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65 * @param aModulus The modulus. |
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66 * @return TBool representing whether or not the message representative is |
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67 * valid. |
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68 */ |
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69 TBool RSAFunction::IsInputValid(const TInteger& aInput, |
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70 const TInteger& aModulus) |
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71 { |
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72 //See HAC 8.3 1.b |
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73 //Message (input) must be in the interval [0,n-1] (inclusive) |
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74 if( aInput.IsNegative() || aInput >= aModulus ) |
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75 return EFalse; |
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76 else |
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77 return ETrue; |
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78 } |
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79 |
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80 void RSAFunction::IsInputValidL(const TInteger& aInput, |
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81 const TInteger& aModulus) |
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82 { |
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83 if(!IsInputValid(aInput, aModulus)) |
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84 User::Leave(KErrArgument); |
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85 } |
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86 |
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87 #endif |