author | Santosh V Patil <santosh.v.patil@nokia.com> |
Fri, 13 Nov 2009 10:54:38 +0530 | |
branch | RCL_1 |
changeset 21 | 9e4400dd0882 |
parent 0 | 2c201484c85f |
permissions | -rw-r--r-- |
0
2c201484c85f
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1 |
/* |
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* Copyright (c) 2005-2009 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 |
* |
2c201484c85f
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9 |
* Initial Contributors: |
2c201484c85f
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: |
2c201484c85f
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* |
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*/ |
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|
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|
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|
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|
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/** |
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@file |
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*/ |
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|
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25 |
#include "pkcs5kdf.h" |
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|
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/* Before complaining about the variable names in this file, |
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* read the pkcs5 spec and all will become clear. |
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*/ |
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|
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EXPORT_C void TPKCS5KDF::DeriveKeyL(TDes8& aKey, const TDesC8& aPasswd, const TDesC8& aSalt, |
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const TUint aIterations) |
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{ |
2c201484c85f
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CSHA1* sha1 = CSHA1::NewL(); |
2c201484c85f
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CleanupStack::PushL(sha1); |
2c201484c85f
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CHMAC* hmac = CHMAC::NewL(aPasswd, sha1); |
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CleanupStack::Pop(sha1); //hmac now owns it |
2c201484c85f
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CleanupStack::PushL(hmac); |
2c201484c85f
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|
2c201484c85f
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TUint hashBytes = hmac->HashSize(); |
2c201484c85f
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TUint c = aIterations; |
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TUint l = aKey.Length() / hashBytes; |
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if(aKey.Length() % hashBytes != 0) //round up if mod !=0 |
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{ |
2c201484c85f
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l+=1; |
2c201484c85f
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46 |
} |
2c201484c85f
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TUint r = aKey.Length() - (l-1) * hashBytes; //r == length of last block |
2c201484c85f
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|
2c201484c85f
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HBufC8* TiTemp = HBufC8::NewLC(hashBytes); |
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TUint32* Ti = (TUint32*)(TiTemp->Ptr()); |
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aKey.SetLength(0); //we've already saved the length we want |
2c201484c85f
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|
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HBufC8* STemp = HBufC8::NewLC(aSalt.Length() + sizeof(TUint32)); |
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TUint32* S = (TUint32*)(STemp->Ptr()); |
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|
2c201484c85f
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HBufC8* UiTemp = HBufC8::NewLC(hashBytes); |
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TUint32* Ui = (TUint32*)(UiTemp->Ptr()); |
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|
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const TUint32* salt = (TUint32*)(aSalt.Ptr()); |
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TUint saltBytes = aSalt.Length(); |
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|
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for(TUint i = 1; i<=l; i++) |
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{ |
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F(*hmac, Ti, S, Ui, hashBytes, salt, saltBytes, c, i); |
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if(i == l) |
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aKey.Append((TUint8*)Ti, r); |
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else |
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aKey.Append((TUint8*)Ti, hashBytes); |
2c201484c85f
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} |
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|
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CleanupStack::PopAndDestroy(UiTemp); |
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CleanupStack::PopAndDestroy(STemp); |
2c201484c85f
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CleanupStack::PopAndDestroy(TiTemp); |
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CleanupStack::PopAndDestroy(hmac); |
2c201484c85f
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75 |
} |
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|
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void TPKCS5KDF::F(CMessageDigest& aDigest, TUint32* aAccumulator, |
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TUint32* S, TUint32* Ui, TUint aHashBytes, const TUint32* aSalt, |
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TUint aSaltBytes, TUint c, TUint i) |
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{ |
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TUint8 itmp[4]; |
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itmp[0] = (TUint8)((i >> 24) & 0xff); |
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itmp[1] = (TUint8)((i >> 16) & 0xff); |
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84 |
itmp[2] = (TUint8)((i >> 8) & 0xff); |
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85 |
itmp[3] = (TUint8)(i & 0xff); |
2c201484c85f
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86 |
TUint8* endOfS = Mem::Copy(S, aSalt, aSaltBytes); |
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Mem::Copy((TUint32*)endOfS, (TUint32*)&itmp, 4); |
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88 |
|
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89 |
TPtr8 sptr((TUint8*)S, aSaltBytes+4); |
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sptr.SetLength(aSaltBytes+4); |
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91 |
Mem::Copy(aAccumulator, (TUint32*)((aDigest.Final(sptr)).Ptr()),aHashBytes); |
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92 |
Mem::Copy(Ui, aAccumulator, aHashBytes); |
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93 |
|
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94 |
for(TUint j=1; j<c; j++) |
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95 |
{ |
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96 |
TPtr8 uiptr((TUint8*)Ui, aHashBytes); |
2c201484c85f
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97 |
uiptr.SetLength(aHashBytes); |
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98 |
Mem::Copy(Ui, (TUint32*)((aDigest.Final(uiptr)).Ptr()), aHashBytes); |
2c201484c85f
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99 |
XORString(Ui, aAccumulator, aHashBytes); |
2c201484c85f
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100 |
} |
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101 |
} |
2c201484c85f
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parents:
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102 |
|
2c201484c85f
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parents:
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103 |
inline void TPKCS5KDF::XORString(const TUint32* aOp1, TUint32* aOp2, |
2c201484c85f
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parents:
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104 |
TUint aLength) |
2c201484c85f
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parents:
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|
105 |
{ |
2c201484c85f
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parents:
diff
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|
106 |
const TUint32* i = aOp1; |
2c201484c85f
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parents:
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|
107 |
|
2c201484c85f
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parents:
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108 |
//this will overflow the whole final word if aLength % 4 != 0 |
2c201484c85f
Move the Security package to EPL, and add the implementations of the cryptographic algorithms
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parents:
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109 |
//but I can't see this mattering cuz all memory allocation is on a word by word basis |
2c201484c85f
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parents:
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110 |
//i don't want to do this byte by byte as it'll be way slower |
2c201484c85f
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parents:
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111 |
//also, every sane digest is going to be a multiple of 4 -- so this isn't a problem |
2c201484c85f
Move the Security package to EPL, and add the implementations of the cryptographic algorithms
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parents:
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112 |
for( ; aOp1 != (TUint32*)((TUint8*)i + aLength); ) |
2c201484c85f
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parents:
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113 |
{ |
2c201484c85f
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parents:
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114 |
*aOp2++ ^= *aOp1++; |
2c201484c85f
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parents:
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|
115 |
} |
2c201484c85f
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Santosh Patil <santosh.v.patil@nokia.com>
parents:
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116 |
} |