--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/crypto/weakcrypto/source/symmetric/des.cpp Fri Jun 11 15:32:35 2010 +0300
@@ -0,0 +1,269 @@
+/*
+* Copyright (c) 2002-2009 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of the License "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description:
+*
+*/
+
+
+#include "des.h"
+#include "destables.h"
+#include "../common/inlines.h"
+#include "des.inl"
+#include <cryptostrength.h>
+
+const TInt KDESBlockBytes = 8;
+const TInt KDESKeyBytes = 8;
+
+// bit 0 is left-most in byte
+static const TInt bytebit[] = {0200,0100,040,020,010,04,02,01};
+
+void CDES::Transform(TDes8& aBlock)
+ {
+ assert(aBlock.Size() == KDESBlockBytes);
+
+ TUint32 l, r;
+ // Split the block into 2 word-sized big endian portions
+ GetBlockBigEndian((TUint8*)&aBlock[0], l, r);
+
+ IPerm(l,r);
+
+ CDES::DoTransform(l, r, iK1);
+
+ FPerm(l,r);
+
+ // Put the portions back into the block as little endian
+ PutBlockBigEndian((TUint8*)&aBlock[0], r, l);
+ }
+
+void CDES::DoTransform(TUint32& l, TUint32& r, const TUint32* aKey)
+ {
+ TInt i = 0;
+ for (; i<8; i++)
+ {
+ TUint32 work = rotrFixed(r, 4U) ^ aKey[4*i+0];
+ l ^= DES_TABLE::sbox[6][(work) & 0x3f]
+ ^ DES_TABLE::sbox[4][(work >> 8) & 0x3f]
+ ^ DES_TABLE::sbox[2][(work >> 16) & 0x3f]
+ ^ DES_TABLE::sbox[0][(work >> 24) & 0x3f];
+ work = r ^ aKey[4*i+1];
+ l ^= DES_TABLE::sbox[7][(work) & 0x3f]
+ ^ DES_TABLE::sbox[5][(work >> 8) & 0x3f]
+ ^ DES_TABLE::sbox[3][(work >> 16) & 0x3f]
+ ^ DES_TABLE::sbox[1][(work >> 24) & 0x3f];
+
+ work = rotrFixed(l, 4U) ^ aKey[4*i+2];
+ r ^= DES_TABLE::sbox[6][(work) & 0x3f]
+ ^ DES_TABLE::sbox[4][(work >> 8) & 0x3f]
+ ^ DES_TABLE::sbox[2][(work >> 16) & 0x3f]
+ ^ DES_TABLE::sbox[0][(work >> 24) & 0x3f];
+ work = l ^ aKey[4*i+3];
+ r ^= DES_TABLE::sbox[7][(work) & 0x3f]
+ ^ DES_TABLE::sbox[5][(work >> 8) & 0x3f]
+ ^ DES_TABLE::sbox[3][(work >> 16) & 0x3f]
+ ^ DES_TABLE::sbox[1][(work >> 24) & 0x3f];
+ }
+ }
+
+
+TInt CDES::BlockSize() const
+ {
+ return KDESBlockBytes;
+ }
+
+TInt CDES::KeySize() const
+ {
+ return KDESKeyBytes;
+ }
+
+CDES::~CDES()
+ {
+ delete iKey;
+ }
+
+void CDES::ConstructL(const TDesC8& aKey, TBool /*aCheckWeakKey*/)
+ {
+ assert(aKey.Size() == KDESKeyBytes);
+
+ iKey = aKey.AllocL();
+ SetKey(aKey, iK1);
+ }
+
+CDES::CDES()
+ {
+ }
+
+typedef TUint8 TKeyDES[KDESKeyBytes];
+const TInt KKnownWeakKeysCount = 16;
+const TKeyDES weak_keys[KKnownWeakKeysCount] =
+ {
+ /* weak keys */
+ {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},
+ {0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE},
+ {0x1E,0x1E,0x1E,0x1E,0x0E,0x0E,0x0E,0x0E},
+ {0xE0,0xE0,0xE0,0xE0,0xF0,0xF0,0xF0,0xF0},
+ {0x00,0xFE,0x00,0xFE,0x00,0xFE,0x00,0xFE},
+ {0xFE,0x00,0xFE,0x00,0xFE,0x00,0xFE,0x00},
+ {0x1E,0xE0,0x1E,0xE0,0x0E,0xF0,0x0E,0xF0},
+ {0xE0,0x1E,0xE0,0x1E,0xF0,0x0E,0xF0,0x0E},
+ {0x00,0xE0,0x00,0xE0,0x00,0xF0,0x00,0xF0},
+ {0xE0,0x00,0xE0,0x00,0xF0,0x00,0xF0,0x00},
+ {0x1E,0xFE,0x1E,0xFE,0x0E,0xFE,0x0E,0xFE},
+ {0xFE,0x1E,0xFE,0x1E,0xFE,0x0E,0xFE,0x0E},
+ {0x00,0x1E,0x00,0x1E,0x00,0x0E,0x00,0x0E},
+ {0x1E,0x00,0x1E,0x00,0x0E,0x00,0x0E,0x00},
+ {0xE0,0xFE,0xE0,0xFE,0xF0,0xFE,0xF0,0xFE},
+ {0xFE,0xE0,0xFE,0xE0,0xFE,0xF0,0xFE,0xF0}
+ };
+
+void CDES::SetKey(const TDesC8& aKey, TUint32* aKeyBuffer)
+ {
+ TInt i=0, j=0, l=0, m=0;
+
+// Form a byte array from aKey, taking endianess into account (little->big)
+ TUint8 key[8]; // For big endian byte array
+ Mem::Copy(&key, &aKey[0], 8);
+
+ TUint8 buffer[56+56+8];
+ TUint8* const pc1m = &buffer[0]; /* place to modify pc1 into */
+ TUint8* const pcr = pc1m + 56; /* place to rotate pc1 into */
+ TUint8* const ks = pcr + 56;
+
+ for (j=0; j<56; j++)
+ {/* convert pc1 to bits of key */
+ l = DES_TABLE::pc1[j]-1; /* integer bit location */
+ m = l & 07; /* find bit */
+ pc1m[j]=(key[l>>3] & /* find which key byte l is in */
+ bytebit[m]) /* and which bit of that byte */
+ ? (TUint8)1 : (TUint8)0; /* and store 1-bit result */
+ }
+
+ for (i=0; i<16; i++)
+ {/* key chunk for each iteration */
+ Mem::FillZ(ks,8); /* Clear key schedule */
+ for (j=0; j<56; j++)
+ /* rotate pc1 the right amount */
+ pcr[j] = pc1m[(l=j+DES_TABLE::totrot[i])<(j<28? 28 : 56) ? l: l-28];
+
+ /* rotate left and right halves independently */
+
+ for (j=0; j<48; j++)
+ {/* select bits individually */
+ /* check bit that goes to ks[j] */
+ if (pcr[DES_TABLE::pc2[j]-1])
+ {/* mask it in if it's there */
+ l= j % 6;
+ ks[j/6] |= bytebit[l] >> 2;
+ }
+ }
+
+ /* Now convert to odd/even interleaved form for use in F */
+ (*(aKeyBuffer+(2*i))) = ((TUint32)ks[0] << 24)
+ | ((TUint32)ks[2] << 16)
+ | ((TUint32)ks[4] << 8)
+ | ((TUint32)ks[6]);
+
+ (*(aKeyBuffer+(2*i+1))) = ((TUint32)ks[1] << 24)
+ | ((TUint32)ks[3] << 16)
+ | ((TUint32)ks[5] << 8)
+ | ((TUint32)ks[7]);
+ }
+ }
+
+void CDES::Reset()
+ {
+ SetKey(*iKey, iK1);
+ }
+
+
+/* CDESEncryptor */
+
+EXPORT_C CDESEncryptor* CDESEncryptor::NewL(const TDesC8& aKey,
+ TBool aCheckWeakKey)
+ {
+ CDESEncryptor* me = CDESEncryptor::NewLC(aKey, aCheckWeakKey);
+ CleanupStack::Pop(me);
+ return (me);
+ }
+
+EXPORT_C CDESEncryptor* CDESEncryptor::NewLC(const TDesC8& aKey,
+ TBool aCheckWeakKey)
+ {
+ CDESEncryptor* me = new (ELeave) CDESEncryptor();
+ CleanupStack::PushL(me);
+ me->ConstructL(aKey, aCheckWeakKey);
+ // DES only used 7 bits out of every key byte
+ TCrypto::IsSymmetricWeakEnoughL(BytesToBits(aKey.Size()) - aKey.Size());
+ return (me);
+ }
+
+CDESEncryptor::CDESEncryptor()
+ {
+ }
+
+/* CDESDecryptor */
+
+EXPORT_C CDESDecryptor* CDESDecryptor::NewL(const TDesC8& aKey,
+ TBool aCheckWeakKey)
+ {
+ CDESDecryptor* me = CDESDecryptor::NewLC(aKey, aCheckWeakKey);
+ CleanupStack::Pop(me);
+ return (me);
+ }
+
+EXPORT_C CDESDecryptor* CDESDecryptor::NewLC(const TDesC8& aKey,
+ TBool aCheckWeakKey)
+ {
+ CDESDecryptor* me = new (ELeave) CDESDecryptor();
+ CleanupStack::PushL(me);
+ me->ConstructL(aKey, aCheckWeakKey);
+ // DES only used 7 bits out of every key byte
+ TCrypto::IsSymmetricWeakEnoughL(BytesToBits(aKey.Size()) - aKey.Size());
+ return (me);
+ }
+
+
+CDESDecryptor::CDESDecryptor()
+ {
+ }
+
+void CDESDecryptor::SetKey(const TDesC8& aKey, TUint32* aKeyBuffer)
+ {
+ CDES::SetKey(aKey, aKeyBuffer);
+
+ ReverseKeySchedule(iK1);
+ }
+
+EXPORT_C TBool CDES::IsWeakKey(const TDesC8& aKey)
+ {
+ TKeyDES key;
+ TInt index = 0;
+ //Reset parity bits
+ for(; index < KDESKeyBytes; index++)
+ {
+ key[index] = aKey[index] & 0xFE;
+ }
+
+ TBool weak = EFalse;
+ //Compare key with potential weak keys without parity
+ for (index=0; index < KKnownWeakKeysCount; index++)
+ {
+ if (Mem::Compare(weak_keys[index], KDESKeyBytes, &key[0], KDESKeyBytes)==0)
+ {
+ weak = ETrue;
+ break;
+ }
+ }
+ return weak;
+ }
+