MCL/sf/os/security: crypto/weakcrypto/source/symmetric/arc4.cpp@2c201484c85f (annotated)

0 2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	1	/*
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	2	* Copyright (c) 2002-2009 Nokia Corporation and/or its subsidiary(-ies).
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	3	* All rights reserved.
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	4	* This component and the accompanying materials are made available
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	5	* under the terms of the License "Eclipse Public License v1.0"
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	6	* which accompanies this distribution, and is available
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	7	* at the URL "http://www.eclipse.org/legal/epl-v10.html".
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	8	*
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	9	* Initial Contributors:
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	10	* Nokia Corporation - initial contribution.
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	11	*
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	12	* Contributors:
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	13	*
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	14	* Description:
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	15	*
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	16	*/
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	17
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	18
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	19	#include "arc4.h"
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	20	#include "../common/inlines.h"
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	21	#include <e32base.h>
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	22	#include <cryptostrength.h>
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	23
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	24	inline TUint8 CARC4::GenerateByte()
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	25	{
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	26	TUint8 a = iState[ix];
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	27	iy = (TUint8)((iy + a) & 0xff);
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	28	TUint8 b = iState[iy];
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	29
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	30	iState[ix] = b;
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	31	iState[iy] = a;
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	32	ix = (TUint8)((ix + 1) & 0xff);
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	33	return (iState[(a + b) & 0xff]);
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	34	}
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	35
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	36	CARC4::CARC4(const TDesC8& aKey, TUint aDiscardBytes)
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	37	: ix(1), iy(0), iDiscardBytes(aDiscardBytes)
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	38	{
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	39	iKey.Copy(aKey);
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	40	GenerateSBox();
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	41	}
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	42
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	43	EXPORT_C CARC4* CARC4::NewL(const TDesC8& aKey, TUint aDiscardBytes)
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	44	{
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	45	CARC4* self = NewLC(aKey, aDiscardBytes);
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	46	CleanupStack::Pop(self);
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	47	return self;
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	48	}
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	49
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	50	EXPORT_C CARC4* CARC4::NewLC(const TDesC8& aKey, TUint aDiscardBytes)
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	51	{
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	52	CARC4* self = new(ELeave)CARC4(aKey, aDiscardBytes);
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	53	CleanupStack::PushL(self);
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	54	TCrypto::IsSymmetricWeakEnoughL(BytesToBits(aKey.Size()));
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	55	return self;
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	56	}
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	57
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	58	void CARC4::DoProcess(TDes8& aData)
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	59	{
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	60	TInt blockLen = aData.Size();
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	61
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	62	if (blockLen > 0)
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	63	{
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	64	TUint8* blockPtr = (TUint8*)&aData[0];
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	65	do
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	66	{
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	67	*blockPtr++ ^= GenerateByte();
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	68	}
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	69	while (--blockLen);
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	70	}
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	71	}
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	72
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	73	void CARC4::Reset()
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	74	{
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	75	ix = 1;
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	76	iy = 0;
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	77	GenerateSBox();
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	78	}
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	79
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	80	TInt CARC4::KeySize() const
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	81	{
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	82	return (iKey.Size());
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	83	}
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	84
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	85	void CARC4::DiscardBytes(TInt aDiscardBytes)
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	86	{
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	87	if (aDiscardBytes > 0)
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	88	{
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	89	do
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	90	{
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	91	GenerateByte();
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	92	}
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	93	while(--aDiscardBytes);
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	94	}
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	95	}
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	96
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	97	void CARC4::GenerateSBox(void)
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	98	{
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	99	TUint keyBytes = iKey.Size();
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	100
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	101	TInt i = 0;
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	102	for (; i < KSBoxSize; i++)
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	103	iState[i] = (TUint8)i;
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	104
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	105	TUint keyIndex = 0, stateIndex = 0;
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	106	i = 0;
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	107	for (; i < KSBoxSize; i++)
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	108	{
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	109	TUint a = iState[i];
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	110	stateIndex += iKey[keyIndex] + a;
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	111	stateIndex &= 0xff;
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	112	iState[i] = iState[stateIndex];
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	113	iState[stateIndex] = (TUint8)a;
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	114	if (++keyIndex >= (TUint)keyBytes)
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	115	keyIndex = 0;
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	116	}
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	117
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	118	DiscardBytes(iDiscardBytes);
2c201484c85f Move the Security package to EPL, and add the implementations of the cryptographic algorithms Santosh Patil <santosh.v.patil@nokia.com> parents: diff changeset	119	}

author	Santosh Patil <santosh.v.patil@nokia.com>
	Wed, 08 Jul 2009 11:25:26 +0100
changeset 0	2c201484c85f
permissions	-rw-r--r--