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1 /* |
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2 * Copyright (c) 2001-2009 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 * Implementation for the class encoding Big Integers in ASN1 DER |
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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 #include <asn1enc.h> |
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21 |
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22 #include <bigint.h> |
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23 |
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24 |
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25 EXPORT_C CASN1EncBigInt* CASN1EncBigInt::NewLC(const TInteger& aInteger) |
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26 { |
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27 CASN1EncBigInt* self = new (ELeave) CASN1EncBigInt(); |
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28 CleanupStack::PushL(self); |
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29 self->ConstructL(aInteger); |
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30 return self; |
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31 } |
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32 |
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33 EXPORT_C CASN1EncBigInt* CASN1EncBigInt::NewL(const TInteger& aInteger) |
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34 { |
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35 CASN1EncBigInt* self = NewLC(aInteger); |
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36 CleanupStack::Pop(self); |
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37 return self; |
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38 } |
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39 |
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40 |
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41 EXPORT_C CASN1EncBigInt::~CASN1EncBigInt() |
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42 { |
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43 delete iContents; |
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44 } |
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45 |
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46 |
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47 CASN1EncBigInt::CASN1EncBigInt() |
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48 : CASN1EncPrimitive(EASN1Integer) |
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49 { |
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50 } |
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51 |
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52 void CASN1EncBigInt::ConstructL(const TInteger& aInteger) |
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53 { |
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54 iContents = aInteger.BufferLC(); |
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55 |
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56 CleanupStack::Pop(); // We take ownership of the contents |
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57 |
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58 // May wish to skip leading byte(s) if they're unnecessary - use |
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59 // iWriteContents to point to the minimal part of Contents, that we'll actually use. |
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60 TInt last = iContents->Length() - 1; |
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61 TInt first = 0; |
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62 // if (aInteger >= 0) // Only signed integers now... |
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63 // { |
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64 while (first < last |
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65 && (*iContents)[first] == 0 |
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66 && !((*iContents)[first + 1] & 0x80)) |
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67 { |
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68 ++first; |
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69 } |
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70 // } |
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71 /* else |
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72 { |
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73 while (first < last |
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74 && (*iContents)[first] == 0xFF |
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75 && (*iContents)[first + 1] & 0x80) |
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76 { |
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77 ++first; |
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78 } |
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79 } |
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80 */ |
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81 //to encode positive integers correctly add a leading zero byte |
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82 //if the first bit is set DEF038956 |
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83 if (iContents->Length() != 0) |
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84 { |
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85 if ((*iContents)[first] & 0x80) |
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86 { |
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87 _LIT8(KPadZero, "\0"); |
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88 TPtr8 ptr = iContents->Des(); |
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89 //check if the buffer does not have enough space to insert a byte |
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90 if (ptr.Length() == ptr.MaxLength()) |
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91 { |
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92 iContents = iContents->ReAllocL(iContents->Length() + 1); |
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93 TPtr8 reallocptr = iContents->Des(); |
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94 reallocptr.Insert(0, KPadZero); |
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95 } |
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96 else |
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97 ptr.Insert(0, KPadZero); |
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98 } |
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99 } |
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100 |
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101 |
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102 iWriteContents.Set(iContents->Mid(first)); |
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103 |
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104 CASN1EncPrimitive::ConstructL(); |
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105 } |
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106 |
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107 |
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108 void CASN1EncBigInt::CalculateContentsLengthDER() |
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109 { |
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110 iContentsLengthDER = iWriteContents.Length(); |
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111 } |
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112 |
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113 |
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114 void CASN1EncBigInt::WriteContentsDERL(TDes8& aBuf) const |
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115 { |
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116 aBuf.Copy(iWriteContents); |
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117 } |