--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cryptomgmtlibs/securityutils/source/secutil/base64.cpp	Wed Jul 08 11:25:26 2009 +0100
@@ -0,0 +1,210 @@
+/*
+* Copyright (c) 2008-2009 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: 
+* Base64 encoding and decoding functions.
+*
+*/
+
+
+
+
+/**
+ @file
+*/
+
+#include "base64.h"
+
+// Constants used by the Base64 algorithm
+const TUint8 TBase64::iAlphabet[] =
+	"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
+const TInt8 KImcvLookUpStartOffset = 43;
+const TUint8 KImcvConvEquals = '=';
+const TInt8 AsciiToBase64[80]=
+	{
+	 62, -1, -1, -1, 63, 52, 53, 54, 55, 56,
+	 57, 58, 59, 60, 61, -1, -1, -1, 64, -1,
+	 -1, -1,  0,  1,  2,  3,  4,  5,  6,  7,
+	  8,  9, 10, 11, 12, 13, 14, 15, 16, 17,
+	 18, 19, 20, 21, 22, 23, 24, 25, -1, -1,
+	 -1, -1, -1, -1, 26, 27, 28, 29, 30, 31,
+	 32, 33, 34, 35, 36, 37, 38, 39, 40, 41,
+	 42, 43, 44, 45, 46, 47, 48, 49, 50, 51
+	};
+const TInt8 Base64ToAscii[65]=
+	{
+	 65, 66, 67, 68, 69, 70, 71, 72, 73, 74,
+	 75, 76, 77, 78, 79, 80, 81, 82, 83, 84,
+	 85, 86, 87, 88, 89, 90, 97, 98, 99,100,
+	101,102,103,104,105,106,107,108,109,110,
+	111,112,113,114,115,116,117,118,119,120,
+	121,122, 48, 49, 50, 51, 52, 53, 54, 55,
+	 56, 57, 43, 47, 61
+	};
+
+EXPORT_C TBase64::TBase64() :
+	iShiftStored(0),
+	iMaskShiftStored(ESix)
+	{
+	}
+
+EXPORT_C void TBase64::Initialize()
+	{
+	iMaskShiftStored = ESix;
+	}
+
+//Encodes data to Base64.
+EXPORT_C HBufC8* TBase64::EncodeLC(const TDesC8& aSrcString)
+	{
+	// Allocate and clear destination string
+	TInt destLen = ((aSrcString.Length() - 1) / 3 + 1) * 4;
+	HBufC8* destString = HBufC8::NewMaxLC(destLen);
+	TPtr8 destPtr = destString->Des();
+
+	// Initialise variables
+	const TUint8* srcStringPtr = aSrcString.Ptr();
+	const TUint8* srcStringEnd = aSrcString.Length() + srcStringPtr;
+	TUint8* destStringPtr = (TUint8*)destString->Ptr();
+	TUint8* destStringPtrBase = destStringPtr;
+
+	TInt character = 0;
+	TUint8 encodedChar = 0;
+	TInt charStorage = 0;
+ 	TInt maskShift = EZero;
+
+	while (srcStringPtr <= srcStringEnd)
+		{
+		// maskShift is used as a char read counter
+		if(maskShift == ESix)
+			{
+			// If the 3rd char read is also the last char then the while loop
+			// is broken on the next check.
+			if(srcStringPtr == srcStringEnd)
+				srcStringPtr++;
+			maskShift = EZero;
+			character = 0;
+			}
+		else
+			{
+			if (srcStringPtr == srcStringEnd)
+				character=0;
+			else
+				character = *srcStringPtr;
+
+			srcStringPtr++;
+			// Shifts charStorage ready for the next char
+			charStorage = charStorage << 8;
+			maskShift += ETwo;
+			}
+		charStorage = charStorage | character;
+		// Shifts the mask to the correct bit location
+		// Masks (AND's) the valid bits from charStorage
+		// Shifts the valid bits into the low order 8bits
+		// Converts to BASE64 char, Casts the result to an unsigned
+		// char (which it should be ?....I hope)
+		encodedChar = (TUint8)Base64ToAscii[((charStorage >> maskShift) & ESixBitMask)];
+		*destStringPtr++ = encodedChar;
+		}
+
+	// Check for not enough chars and pad if required
+	if (maskShift == EFour)
+		{
+		*destStringPtr++ = KImcvConvEquals;
+		*destStringPtr++ = KImcvConvEquals;
+		}
+	else
+		if (maskShift == ESix)
+			*destStringPtr++ = KImcvConvEquals;
+
+	destPtr.SetLength((TInt)(destStringPtr - destStringPtrBase));
+	return destString;
+	}
+
+//Decodes Base64-encoded data.
+EXPORT_C HBufC8* TBase64::DecodeLC(const TDesC8& aSrcString, TBool& aNeedMoreData)
+	{
+	// The source string must be a multiple of 4 bytes long
+	if (aSrcString.Length() & 0x3)
+		{
+		User::Leave(KErrCorrupt);
+		}
+
+	TInt decodedInt = 0;
+	TInt8 offsetChar = 0;
+	TUint8 decodedChar = 0;
+
+    // Find out how long the decoded string will be.
+    TInt outLen = aSrcString.Length() / 4 * 3;
+    if (aSrcString[aSrcString.Length() - 1] == '=')
+        outLen--;
+    if (aSrcString[aSrcString.Length() - 2] == '=')
+        outLen--;
+
+	// Construct output buffer.
+	HBufC8* destString = HBufC8::NewMaxLC(outLen);
+	TPtr8 destPtr = destString->Des();
+	destPtr.Zero();
+
+	// Initialise variables
+	const TUint8* srcStringPtr = aSrcString.Ptr();
+	const TUint8* srcStringEnd = aSrcString.Length() + srcStringPtr;
+	TUint8* destStringPtr = (TUint8*)destString->Ptr();
+	TUint8* destStringPtrBase = destStringPtr;
+	TInt maskShift = iMaskShiftStored;
+	TInt shiftStorage = iShiftStored;
+
+	// Main character process loop
+	while (srcStringPtr<srcStringEnd)
+		{
+		offsetChar = (TInt8)(*srcStringPtr - KImcvLookUpStartOffset);
+		srcStringPtr++;
+
+		// Check for valid B64 character
+		if ((offsetChar >= 0) && (offsetChar < 80))
+			{
+			// Read in next character and B64 decode
+			decodedInt = AsciiToBase64[offsetChar];
+
+			// Exits when a PAD char is reached
+			if(decodedInt == EPadChar)
+				{
+				destPtr.SetLength((TInt)(destStringPtr - destStringPtrBase));
+				aNeedMoreData = EFalse;
+				return destString;
+				}
+
+			// Ensures the first 2 chars of 4 are received before processing
+			if(maskShift == ESix)
+				maskShift = EFour;
+			else
+				{
+				shiftStorage = shiftStorage << ESix;
+				shiftStorage = shiftStorage | decodedInt;
+				decodedChar = (TUint8)((shiftStorage >> maskShift) & EEightBitMask);
+
+				if((maskShift -= ETwo) < EZero)
+					maskShift = ESix;
+
+				*destStringPtr++ = decodedChar;
+				}
+			shiftStorage = decodedInt;
+			}
+		}
+	iShiftStored = shiftStorage;
+	iMaskShiftStored = maskShift;
+
+	destPtr.SetLength((TInt)(destStringPtr - destStringPtrBase));
+	aNeedMoreData = maskShift < ESix;
+	return destString;
+	}
+