|
1 /* |
|
2 * Copyright (c) 2002-2009 Nokia Corporation and/or its subsidiary(-ies). |
|
3 * All rights reserved. |
|
4 * This component and the accompanying materials are made available |
|
5 * under the terms of the License "Eclipse Public License v1.0" |
|
6 * which accompanies this distribution, and is available |
|
7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
|
8 * |
|
9 * Initial Contributors: |
|
10 * Nokia Corporation - initial contribution. |
|
11 * |
|
12 * Contributors: |
|
13 * |
|
14 * Description: |
|
15 * |
|
16 */ |
|
17 |
|
18 |
|
19 #include <e32std.h> |
|
20 #include <random.h> |
|
21 |
|
22 #include <pbencryptor.h> |
|
23 #include "pbesymmetricfactory.h" |
|
24 |
|
25 #ifdef SYMBIAN_ENABLE_SPLIT_HEADERS |
|
26 /** The maximum block size supported (in bytes) */ |
|
27 const TUint KMaxBlockSizeSupported = 32; |
|
28 #endif |
|
29 |
|
30 EXPORT_C CPBEncryptorSet* CPBEncryptorSet::NewL( |
|
31 const TPBECipher aCipher, const TDesC8& aKey) |
|
32 { |
|
33 CPBEncryptorSet* self = NewLC(aCipher, aKey); |
|
34 CleanupStack::Pop(); |
|
35 return self; |
|
36 } |
|
37 |
|
38 EXPORT_C CPBEncryptorSet* CPBEncryptorSet::NewLC( |
|
39 const TPBECipher aCipher, const TDesC8& aKey) |
|
40 { |
|
41 CPBEncryptorSet* self = new(ELeave) CPBEncryptorSet; |
|
42 CleanupStack::PushL(self); |
|
43 |
|
44 self->ConstructL(aCipher, aKey); |
|
45 |
|
46 return self; |
|
47 } |
|
48 |
|
49 void CPBEncryptorSet::ConstructL(const TPBECipher aCipher,const TDesC8& aKey) |
|
50 { |
|
51 TInt blocksize = PBE::GetBlockBytes(aCipher); |
|
52 iIV = HBufC8::NewMaxL(blocksize); |
|
53 TPtr8 iv = iIV->Des(); |
|
54 TRandom::RandomL(iv); |
|
55 |
|
56 iCipher = PBE::MakeEncryptorL(aCipher, aKey, iv); |
|
57 } |
|
58 |
|
59 void CPBEncryptorSet::Process(const TDesC8& aInput, TDes8& aOutput) |
|
60 { |
|
61 if(!iIVSent) |
|
62 { |
|
63 aOutput.Append(*iIV); |
|
64 iIVSent = ETrue; |
|
65 } |
|
66 iCipher->Process(aInput, aOutput); |
|
67 } |
|
68 |
|
69 void CPBEncryptorSet::ProcessFinalL(const TDesC8& aInput, |
|
70 TDes8& aOutput) |
|
71 { |
|
72 if(!iIVSent) |
|
73 { |
|
74 aOutput.Append(*iIV); |
|
75 iIVSent = ETrue; |
|
76 } |
|
77 |
|
78 iCipher->ProcessFinalL(aInput, aOutput); |
|
79 } |
|
80 |
|
81 |
|
82 CPBEncryptorSet::CPBEncryptorSet() : iIVSent(EFalse) |
|
83 { |
|
84 } |
|
85 |
|
86 CPBEncryptorSet::~CPBEncryptorSet() |
|
87 { |
|
88 delete iIV; |
|
89 delete iCipher; // Don't delete iCBCDecryptor, this belongs to iCipher |
|
90 } |
|
91 |
|
92 TInt CPBEncryptorSet::MaxOutputLength(TUint aMaxInputLength) const |
|
93 { |
|
94 if(iIVSent) |
|
95 { |
|
96 return (iCipher->MaxOutputLength(aMaxInputLength)); |
|
97 } |
|
98 else |
|
99 {// If we've not sent the iv yet then its the length |
|
100 // from the cipher plus a blocksize for the iv |
|
101 return (iCipher->MaxOutputLength(aMaxInputLength + iCipher->BlockSize())); |
|
102 } |
|
103 } |
|
104 |
|
105 TInt CPBEncryptorSet::MaxFinalOutputLength(TUint aMaxInputLength) const |
|
106 { |
|
107 if(iIVSent) |
|
108 { |
|
109 return (iCipher->MaxFinalOutputLength(aMaxInputLength)); |
|
110 } |
|
111 else |
|
112 {// If we've not sent the iv yet then its the length |
|
113 // from the cipher plus a blocksize for the iv |
|
114 return (iCipher->MaxFinalOutputLength(aMaxInputLength + iCipher->BlockSize())); |
|
115 } |
|
116 } |
|
117 |
|
118 EXPORT_C CPBDecryptorSet* CPBDecryptorSet::NewL(const TPBECipher aCipher, |
|
119 const TDesC8& aKey) |
|
120 { |
|
121 CPBDecryptorSet* self = NewLC(aCipher, aKey); |
|
122 CleanupStack::Pop(); |
|
123 return self; |
|
124 } |
|
125 |
|
126 EXPORT_C CPBDecryptorSet* CPBDecryptorSet::NewLC(const TPBECipher aCipher, |
|
127 const TDesC8& aKey) |
|
128 { |
|
129 CPBDecryptorSet* self = new(ELeave) CPBDecryptorSet; |
|
130 CleanupStack::PushL(self); |
|
131 TBuf8<KMaxBlockSizeSupported> fakeIV; |
|
132 fakeIV.SetLength(PBE::GetBlockBytes(aCipher)); |
|
133 self->ConstructL(aCipher, aKey, fakeIV); |
|
134 return self; |
|
135 } |
|
136 |
|
137 void CPBDecryptorSet::ConstructL(const TPBECipher aCipher, |
|
138 const TDesC8& aKey, const TDesC8& aIV) |
|
139 { |
|
140 iCipher = PBE::MakeDecryptorL(aCipher, aKey, aIV); |
|
141 iIVBuf = HBufC8::NewL(PBE::GetBlockBytes(aCipher)); |
|
142 } |
|
143 |
|
144 void CPBDecryptorSet::Process(const TDesC8& aInput, TDes8& aOutput) |
|
145 { |
|
146 TPtrC8 input = ProcessIV(aInput); |
|
147 iCipher->Process(input, aOutput); |
|
148 } |
|
149 |
|
150 void CPBDecryptorSet::ProcessFinalL(const TDesC8& aInput, TDes8& aOutput) |
|
151 { |
|
152 TPtrC8 input = ProcessIV(aInput); |
|
153 iCipher->ProcessFinalL(input, aOutput); |
|
154 } |
|
155 |
|
156 TPtrC8 CPBDecryptorSet::ProcessIV(const TDesC8& aInput) |
|
157 { |
|
158 if(!iIVSent) |
|
159 { |
|
160 TPtr8 iIVBufPtr(iIVBuf->Des()); |
|
161 if(aInput.Length() + iIVBufPtr.Length() < iCipher->BlockSize()) |
|
162 { |
|
163 iIVBufPtr.Append(aInput); |
|
164 return TPtrC8(); |
|
165 } |
|
166 else |
|
167 { |
|
168 TInt rem = iCipher->BlockSize() - iIVBufPtr.Length(); |
|
169 iIVBufPtr.Append(aInput.Mid(0, rem)); |
|
170 CBufferedDecryptor* blockDecryptor = static_cast<CBufferedDecryptor*>(iCipher); |
|
171 static_cast<CModeCBCDecryptor*>(blockDecryptor->BlockTransformer())->SetIV(iIVBufPtr); |
|
172 iIVSent = ETrue; |
|
173 return aInput.Mid(rem); |
|
174 } |
|
175 } |
|
176 else |
|
177 { |
|
178 return aInput; |
|
179 } |
|
180 } |
|
181 |
|
182 CPBDecryptorSet::CPBDecryptorSet() : iIVSent(EFalse) |
|
183 { |
|
184 } |
|
185 |
|
186 CPBDecryptorSet::~CPBDecryptorSet() |
|
187 { |
|
188 delete iCipher; |
|
189 //iCipher owns iCBCDecryptor we _don't_ need to delete it |
|
190 delete iIVBuf; |
|
191 } |
|
192 |
|
193 TInt CPBDecryptorSet::MaxOutputLength(TUint aMaxInputLength) const |
|
194 { |
|
195 if(iIVSent) |
|
196 { |
|
197 return (iCipher->MaxOutputLength(aMaxInputLength)); |
|
198 } |
|
199 else // if we haven't sent the iv yet, then the length the max length of the |
|
200 { // cipher minus a BlockSize where the IV was sitting (as the iv would be part |
|
201 // of the length they've sent us) |
|
202 return (iCipher->MaxOutputLength(aMaxInputLength - iCipher->BlockSize())); |
|
203 } |
|
204 } |
|
205 |
|
206 TInt CPBDecryptorSet::MaxFinalOutputLength(TUint aMaxInputLength) const |
|
207 { |
|
208 if(iIVSent) |
|
209 { |
|
210 return (iCipher->MaxFinalOutputLength(aMaxInputLength)); |
|
211 } |
|
212 else // if we haven't sent the iv yet, then the length the max length of the |
|
213 { // cipher minus a BlockSize where the IV was sitting (as the iv would be part |
|
214 // of the length they've sent us) |
|
215 return (iCipher->MaxFinalOutputLength(aMaxInputLength - iCipher->BlockSize())); |
|
216 } |
|
217 } |