--- a/crypto/weakcrypto/source/padding/padding.cpp Tue Aug 31 17:00:08 2010 +0300
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,362 +0,0 @@
-/*
-* Copyright (c) 1999-2009 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 <e32base.h>
-#include <random.h>
-#include <padding.h>
-#include <securityerr.h>
-#include <cryptopanic.h>
-
-/* CPadding */
-CPadding::CPadding(void) : iBlockBytes(-1)
- {
- }
-
-EXPORT_C CPadding::CPadding(TInt aBlockBytes) : iBlockBytes(aBlockBytes)
- {
- __ASSERT_ALWAYS(aBlockBytes > 0, User::Invariant());
- }
-
-EXPORT_C void CPadding::SetBlockSize(TInt aBlockBytes)
- {
- __ASSERT_ALWAYS(aBlockBytes > 0, User::Invariant());
- iBlockBytes = aBlockBytes;
- }
-
-EXPORT_C TInt CPadding::BlockSize(void) const
- {
- return iBlockBytes;
- }
-
-EXPORT_C TInt CPadding::MaxPaddedLength(TInt /*aInputBytes*/) const
- {
- return BlockSize();
- }
-
-EXPORT_C TInt CPadding::MaxUnPaddedLength(TInt aInputBytes) const
- {
- return aInputBytes - MinPaddingLength();
- }
-
-EXPORT_C void CPadding::PadL(const TDesC8& aInput, TDes8& aOutput)
- {
- // Check that the input is small enough to fit inside one padded block
- __ASSERT_DEBUG(aInput.Length() <= BlockSize() - MinPaddingLength(),
- User::Panic(KCryptoPanic, ECryptoPanicPadInputTooLarge));
-
- // Check that the output descriptor supplied is large enough to store the result
- __ASSERT_DEBUG(aOutput.MaxLength() >= MaxPaddedLength(aInput.Length()),
- User::Panic(KCryptoPanic, ECryptoPanicOutputDescriptorOverflow));
-
- // Call the virtual function, implemented by derived classes
- DoPadL(aInput, aOutput);
- }
-
-/* CPaddingNone */
-EXPORT_C CPaddingNone* CPaddingNone::NewL(TInt aBlockBytes)
- {
- __ASSERT_ALWAYS(aBlockBytes > 0, User::Leave(KErrArgument));
- return new(ELeave)CPaddingNone(aBlockBytes);
- }
-
-EXPORT_C CPaddingNone* CPaddingNone::NewLC(TInt aBlockBytes)
- {
- CPaddingNone* self = CPaddingNone::NewL(aBlockBytes);
- CleanupStack::PushL(self);
- return self;
- }
-
-EXPORT_C CPaddingNone::CPaddingNone(TInt aBlockBytes):CPadding(aBlockBytes)
- {
- }
-
-void CPaddingNone::DoPadL(const TDesC8& aInput,TDes8& aOutput)
- {
- aOutput.Append(aInput);
- }
-
-void CPaddingNone::UnPadL(const TDesC8& aInput,TDes8& aOutput)
- {
- __ASSERT_DEBUG(aOutput.MaxLength() >= MaxPaddedLength(aInput.Length()), User::Panic(KCryptoPanic, ECryptoPanicOutputDescriptorOverflow));
- aOutput.Append(aInput);
- }
-
-TInt CPaddingNone::MinPaddingLength(void) const
- {
- return 0;
- }
-
-TInt CPaddingNone::MaxPaddedLength(TInt aInputSize) const
- {
- return aInputSize;
- }
-
-/* CPaddingSSLv3 */
-EXPORT_C CPaddingSSLv3* CPaddingSSLv3::NewL(TInt aBlockBytes)
- {
- __ASSERT_ALWAYS(aBlockBytes > 0, User::Leave(KErrArgument));
- return new(ELeave)CPaddingSSLv3(aBlockBytes);
- }
-
-EXPORT_C CPaddingSSLv3* CPaddingSSLv3::NewLC(TInt aBlockBytes)
- {
- CPaddingSSLv3* self = CPaddingSSLv3::NewL(aBlockBytes);
- CleanupStack::PushL(self);
- return self;
- }
-
-EXPORT_C CPaddingSSLv3::CPaddingSSLv3(TInt aBlockBytes):CPadding(aBlockBytes)
- {
- }
-
-void CPaddingSSLv3::DoPadL(const TDesC8& aInput,TDes8& aOutput)
- {
- TInt paddingBytes=BlockSize()-(aInput.Length()%BlockSize());
- aOutput.Append(aInput);
- aOutput.SetLength(aOutput.Length()+paddingBytes);
- for (TInt i=1;i<=paddingBytes;i++)
- {
- aOutput[aOutput.Length()-i]=(TUint8)(paddingBytes-1);
- }
- }
-
-void CPaddingSSLv3::UnPadL(const TDesC8& aInput,TDes8& aOutput)
- {
- TInt paddingLen = aInput[aInput.Length()-1] + 1;
-
- if (paddingLen > aInput.Length())
- {
- User::Leave(KErrInvalidPadding);
- }
-
- TInt outlen = aInput.Length() - paddingLen;
-
- __ASSERT_DEBUG(aOutput.MaxLength() >= outlen, User::Panic(KCryptoPanic, ECryptoPanicOutputDescriptorOverflow));
-
- aOutput.Append(aInput.Left(outlen));
- }
-
-TInt CPaddingSSLv3::MinPaddingLength(void) const
- {
- //if aInputBytes is 1 less than the blocksize then we get 1 byte of padding
- return 1;
- }
-
-TInt CPaddingSSLv3::MaxPaddedLength(TInt aInputBytes) const
- {
- TUint padBytes = BlockSize() - (aInputBytes % BlockSize());
- return padBytes + aInputBytes;
- }
-
-/* CPaddingPKCS1Signature */
-EXPORT_C CPaddingPKCS1Signature* CPaddingPKCS1Signature::NewL(TInt aBlockBytes)
- {
- return new(ELeave)CPaddingPKCS1Signature(aBlockBytes);
- }
-
-EXPORT_C CPaddingPKCS1Signature* CPaddingPKCS1Signature::NewLC(TInt aBlockBytes)
- {
- CPaddingPKCS1Signature* self = CPaddingPKCS1Signature::NewL(aBlockBytes);
- CleanupStack::PushL(self);
- return self;
- }
-
-EXPORT_C CPaddingPKCS1Signature::CPaddingPKCS1Signature(TInt aBlockBytes)
- : CPadding(aBlockBytes)
- {
- }
-
-void CPaddingPKCS1Signature::DoPadL(const TDesC8& aInput,TDes8& aOutput)
- {
- aOutput.SetLength(BlockSize());
- TInt i;
- TInt j;
- aOutput[0]=0;
- TInt startOfData=BlockSize()-aInput.Length();
- // PKCS1 also specifies a block type 0 for private key operations but
- // does not recommend its use. This block type (0) is compatible with
- // unpadded data though so you can create PKCS1 type 0 blocks using
- // CPaddingNone.
- aOutput[1]=1; // Block type 1 (private key operation)
- for (i=2;i<(startOfData-1);i++)
- {
- aOutput[i]=0xff;
- }
- j=0;
- aOutput[startOfData-1]=0; // separator
- for (i=startOfData;i<BlockSize();i++,j++)
- {
- aOutput[i]=aInput[j];
- }
- }
-
-void CPaddingPKCS1Signature::UnPadL(const TDesC8& aInput,TDes8& aOutput)
- {
- // erm, oops, this is not quite as simplistic as it first looks...
- // our integer class will strip any leading zeros so we might actually
- // get some real data that starts out looking like padding but isn't
- // really
-
- TInt inputLen = aInput.Length();
- if (inputLen <=0 )
- User::Leave(KErrInvalidPadding); // Invalid padding data
-
- // Leading zero may have been stripped off by integer class
- TInt dataStart=0;
- if (aInput[dataStart] == 0)
- {
- ++dataStart;
- }
-
- if (dataStart < inputLen && aInput[dataStart]) // might be mode one or mode zero,
- {
- ++dataStart;
- while (dataStart < inputLen && aInput[dataStart] == 0xff)
- {
- ++dataStart;
- }
-
- if (dataStart == inputLen || aInput[dataStart]) // this would mean theres no zero between 0x01ff and data...so its not mode one
- dataStart=0; // mode zero, start from begining of data
- else
- ++dataStart;
- }
- else // We've definitely got a mode zero
- { // or broken data, assume mode zero
- dataStart=0;
- }
-
- TInt len=inputLen-dataStart;
-
- __ASSERT_DEBUG(aOutput.MaxLength() >= len, User::Panic(KCryptoPanic, ECryptoPanicOutputDescriptorOverflow));
-
- aOutput.SetLength(len);
- TInt i=0;
- while (dataStart<inputLen)
- {
- aOutput[i++]=aInput[dataStart++];
- }
- }
-
-TInt CPaddingPKCS1Signature::MinPaddingLength(void) const
- {
- return 11; //0x00, 0x01, <MIN of 8 0xFF octets> , 0x00
- }
-
-/* CPaddingPKCS1Encryption */
-EXPORT_C CPaddingPKCS1Encryption* CPaddingPKCS1Encryption::NewL(
- TInt aBlockBytes)
- {
- return new(ELeave)CPaddingPKCS1Encryption(aBlockBytes);
- }
-
-EXPORT_C CPaddingPKCS1Encryption* CPaddingPKCS1Encryption::NewLC(
- TInt aBlockBytes)
- {
- CPaddingPKCS1Encryption* self = CPaddingPKCS1Encryption::NewL(aBlockBytes);
- CleanupStack::PushL(self);
- return self;
- }
-
-EXPORT_C CPaddingPKCS1Encryption::CPaddingPKCS1Encryption(TInt aBlockBytes)
- : CPadding(aBlockBytes)
- {
- }
-
-void CPaddingPKCS1Encryption::DoPadL(const TDesC8& aInput,TDes8& aOutput)
- {
- aOutput.SetLength(BlockSize());
-
- aOutput[0]=0;
- TInt startOfData=BlockSize()-aInput.Length();
- aOutput[1]=2; // Block type 2 (public key operation)
- TBuf8<256> rnd(256);
- GenerateRandomBytesL(rnd);
-
- TInt i = 2;
- TInt j = 0;
- for (; i<(startOfData-1);)
- {
- if (rnd[j])
- {
- aOutput[i++]=rnd[j];
- }
- if (++j==256)
- {
- GenerateRandomBytesL(rnd);
- j=0;
- }
- }
-
- j=0;
- aOutput[startOfData-1]=0; // separator
- for (i=startOfData;i<BlockSize();i++,j++)
- {
- aOutput[i]=aInput[j];
- }
- }
-
-void CPaddingPKCS1Encryption::UnPadL(const TDesC8& aInput,TDes8& aOutput)
- {
- TInt inputLen = aInput.Length();
- if (inputLen <= 0)
- User::Leave(KErrInvalidPadding); // Invalid padding data
-
- // Leading zero may have been stripped off by integer class
- TInt dataStart=0;
- if (aInput[dataStart] == 0)
- {
- ++dataStart;
- }
-
- // expecting mode 2 padding, otherwise broken
- if (dataStart == inputLen || aInput[dataStart] != 2)
- {
- User::Leave(KErrInvalidPadding);
- }
- ++dataStart;
-
- // skip random non zero bytes
- while (dataStart < inputLen && aInput[dataStart])
- {
- ++dataStart;
- }
-
- // expecting zero separator
- if (dataStart == inputLen || aInput[dataStart] != 0)
- {
- User::Leave(KErrInvalidPadding);
- }
- ++dataStart;
-
- TInt len = inputLen - dataStart;
- __ASSERT_DEBUG(aOutput.MaxLength() >= len, User::Panic(KCryptoPanic, ECryptoPanicOutputDescriptorOverflow));
-
- aOutput.SetLength(len);
- TInt i=0;
- while (dataStart<inputLen)
- {
- aOutput[i++]=aInput[dataStart++];
- }
- }
-
-TInt CPaddingPKCS1Encryption::MinPaddingLength(void) const
- {
- return 11; //0x00, 0x02, <min of 8 random octets>, 0x00
- }
-