--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/linklayerprotocols/pppnif/SPPP/MD4.CPP	Tue Jan 26 15:23:49 2010 +0200
@@ -0,0 +1,301 @@
+// Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies).
+// All rights reserved.
+// This component and the accompanying materials are made available
+// under the terms of "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:
+//
+
+/**
+ @file
+ @brief Source file for the implementation of the MD4 Message-Digest Algorithm - RFC 1320.
+ @internalComponent 
+*/
+
+#include "MD4.H"
+
+// This implementation is fully derived (copied) from the former MD4
+// implementation provided by Symbian PPP in the release 7.0s of
+// Symbian OS.  This is a provisional solution until the Symbian
+// Security subsystem components will provide a MD4 implementation.
+
+#define MD4_S11 3
+#define MD4_S12 7
+#define MD4_S13 11
+#define MD4_S14 19
+#define MD4_S21 3
+#define MD4_S22 5
+#define MD4_S23 9
+#define MD4_S24 13
+#define MD4_S31 3
+#define MD4_S32 9
+#define MD4_S33 11
+#define MD4_S34 15
+
+static const TUint8 Padding[64] =
+	{
+	0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
+	};
+
+// F, G, H and I are basic MD4 functions.
+#define MD4_F(x, y, z) ((x & y) | ((~x) & z))
+#define MD4_G(x, y, z) ((x & y) | (x & z) | (y & z))
+#define MD4_H(x, y, z) (x ^ y ^ z)
+
+// _ROL rotates x left n bits.
+#define _ROL(x, n) (((x) << (n)) | ((x) >> (32-(n))))
+
+// FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
+// Rotation is separate from addition to prevent recomputation.
+#define MD4_FF(a, b, c, d, x, s ) { \
+ a += MD4_F(b, c, d) + x; \
+ a = _ROL (a, s); \
+ }
+#define MD4_GG(a, b, c, d, x, s) { \
+ a += MD4_G(b, c, d) + x + 0x5a827999; \
+ a = _ROL (a, s); \
+ }
+#define MD4_HH(a, b, c, d, x, s) { \
+ a += MD4_H(b, c, d) + x + 0x6ed9eba1; \
+ a = _ROL (a, s); \
+  }
+
+const TInt KMdOutputSize = 16;
+
+CMd4::CMd4()
+	{
+	iCount[0] = 0;
+	iCount[1] = 0;
+	// Load magic initialization constants.
+	iState[0] = 0x67452301;
+	iState[1] = 0xefcdab89;
+	iState[2] = 0x98badcfe;
+	iState[3] = 0x10325476;
+	}
+
+CMd4* CMd4::NewL()
+	{
+	return new(ELeave) CMd4;
+	}
+
+// moved from the former CDigestBase
+TInt CMd4::Input(const TDesC8& aDes)
+	{
+	Update(aDes.Ptr(), aDes.Length());
+	return KErrNone;
+	}
+
+// moved from the former CDigestBase
+TInt CMd4::Output(TDes8& aDes)
+	{
+	TUint8* digest = (TUint8*)aDes.Ptr();
+	if (aDes.MaxLength()<16)
+		return KErrOverflow;
+	
+	Final(digest);
+
+	aDes.SetLength(16);
+	return KErrNone;
+	}
+
+// moved from the former CDigestBase
+TInt CMd4::OutputSize() const
+//
+// Return size of output
+//
+	{
+	return KMdOutputSize;
+	}
+
+// moved from the former CDigestBase
+void CMd4::Update(const TUint8* aInput, TInt aLen)
+//
+// MD5 block update operation. Continues an MD5 message-digest
+// operation, processing another message block, and updating the
+// context.
+//
+	{
+	TInt i;
+	TInt index;
+	TInt partlen;
+
+	/* Compute number of bytes mod 64 */
+	index = (TUint)((iCount[0] >> 3) & 0x3F);
+
+	/* Update number of bits */
+	iCount[0] += (aLen<<3);
+	
+	if (iCount[0] < (TUint)(aLen<<3))
+		iCount[1]++;
+	iCount[1] += (aLen>>29);
+	partlen = 64 - index;
+
+	// Transform as many times as possible.
+	if (aLen >= partlen)
+		{
+		Mem::Copy(&iBuffer[index], aInput, partlen);
+		Transform(iBuffer);
+		for (i = partlen; i+63 < aLen; i += 64)
+		Transform (&aInput[i]);
+		index = 0;
+		}
+	else
+		i = 0;
+
+	/* Buffer remaining input */
+	Mem::Copy(&iBuffer[index], &aInput[i], aLen-i);
+}
+
+// moved from the former CDigestBase
+void CMd4::Final(TUint8* aDigest /*[16]*/)
+//
+// MD5 finalization. Ends an MD5 message-digest operation, writing the
+// the message digest and zeroizing the context.
+//
+	{
+	TUint8 bits[8];
+	TInt index, padlen;
+
+	/* Save number of bits */
+	Encode(bits, (TUint32*)&iCount[0], 8);
+
+	// Pad out to 56 mod 64.
+	index = (TUint)((iCount[0] >> 3) & 0x3f);
+	padlen = (index < 56) ? (56 - index) : (120 - index);
+	Update(Padding, padlen);
+
+	// Append length (before padding) */
+	Update(bits, 8);
+	// Store state in digest */
+	Encode(aDigest, iState, 16);
+
+	// Zero sensitive information.
+	Mem::FillZ(iCount, sizeof(iCount));
+	Mem::FillZ(iState, sizeof(iState));
+	Mem::FillZ(iBuffer, sizeof(iBuffer));
+}
+
+// moved from the former CDigestBase
+void CMd4::Encode(TUint8* aOutput, const TUint32* aInput, TInt aLen)
+//
+// Encodes input (UINT4) into output (unsigned char).
+// Assumes len is a multiple of 4.
+//
+	{
+	TInt i;
+	TInt j;
+
+	for (i=0, j=0; j<aLen; i++, j+=4)
+		{
+		aOutput[j] = (TUint8)(aInput[i] & 0xff);
+		aOutput[j+1] = (TUint8)((aInput[i] >> 8) & 0xff);
+		aOutput[j+2] = (TUint8)((aInput[i] >> 16) & 0xff);
+		aOutput[j+3] = (TUint8)((aInput[i] >> 24) & 0xff);
+		}
+	}
+
+// moved from the former CDigestBase
+void CMd4::Decode(TUint32* aOutput, const TUint8* aInput, TInt aLen)
+//
+// Decodes input (unsigned char) into output (UINT4).
+// Assumes len is a multiple of 4.
+//
+	{
+	TInt i;
+	TInt j;
+
+	for (i=0, j=0; j<aLen; i++, j+=4)
+		{
+		aOutput[i] = ((TUint)aInput[j]) 
+			| (((TUint)aInput[j+1]) << 8) 
+			| (((TUint)aInput[j+2]) << 16) 
+			| (((TUint)aInput[j+3]) << 24);
+		}
+	}
+
+void CMd4::Transform (const TUint8* aBlock /*[64]*/)
+//
+// MD4 basic transformation.
+// Transforms state based on block.
+//	
+	{
+	TUint a = iState[0];
+	TUint b = iState[1];
+	TUint c = iState[2];
+	TUint d = iState[3];
+	TUint x[16] = {0,};
+
+	Decode((TUint32*)&x[0], aBlock, 64);
+
+	/* Round 1 */
+	MD4_FF (a, b, c, d, x[ 0], MD4_S11); /* 1 */
+	MD4_FF (d, a, b, c, x[ 1], MD4_S12); /* 2 */
+	MD4_FF (c, d, a, b, x[ 2], MD4_S13); /* 3 */
+	MD4_FF (b, c, d, a, x[ 3], MD4_S14); /* 4 */
+	MD4_FF (a, b, c, d, x[ 4], MD4_S11); /* 5 */
+	MD4_FF (d, a, b, c, x[ 5], MD4_S12); /* 6 */
+	MD4_FF (c, d, a, b, x[ 6], MD4_S13); /* 7 */
+	MD4_FF (b, c, d, a, x[ 7], MD4_S14); /* 8 */
+	MD4_FF (a, b, c, d, x[ 8], MD4_S11); /* 9 */
+	MD4_FF (d, a, b, c, x[ 9], MD4_S12); /* 10 */
+	MD4_FF (c, d, a, b, x[10], MD4_S13); /* 11 */
+	MD4_FF (b, c, d, a, x[11], MD4_S14); /* 12 */
+	MD4_FF (a, b, c, d, x[12], MD4_S11); /* 13 */
+	MD4_FF (d, a, b, c, x[13], MD4_S12); /* 14 */
+	MD4_FF (c, d, a, b, x[14], MD4_S13); /* 15 */
+	MD4_FF (b, c, d, a, x[15], MD4_S14); /* 16 */
+
+	/* Round 2 */
+	MD4_GG (a, b, c, d, x[ 0], MD4_S21); /* 17 */
+	MD4_GG (d, a, b, c, x[ 4], MD4_S22); /* 18 */
+	MD4_GG (c, d, a, b, x[ 8], MD4_S23); /* 19 */
+	MD4_GG (b, c, d, a, x[12], MD4_S24); /* 20 */
+	MD4_GG (a, b, c, d, x[ 1], MD4_S21); /* 21 */
+	MD4_GG (d, a, b, c, x[ 5], MD4_S22); /* 22 */
+	MD4_GG (c, d, a, b, x[ 9], MD4_S23); /* 23 */
+	MD4_GG (b, c, d, a, x[13], MD4_S24); /* 24 */
+	MD4_GG (a, b, c, d, x[ 2], MD4_S21); /* 25 */
+	MD4_GG (d, a, b, c, x[ 6], MD4_S22); /* 26 */
+	MD4_GG (c, d, a, b, x[10], MD4_S23); /* 27 */
+	MD4_GG (b, c, d, a, x[14], MD4_S24); /* 28 */
+	MD4_GG (a, b, c, d, x[ 3], MD4_S21); /* 29 */
+	MD4_GG (d, a, b, c, x[ 7], MD4_S22); /* 30 */
+	MD4_GG (c, d, a, b, x[11], MD4_S23); /* 31 */
+	MD4_GG (b, c, d, a, x[15], MD4_S24); /* 32 */
+
+	/* Round 3 */
+	MD4_HH (a, b, c, d, x[ 0], MD4_S31); /* 33 */
+	MD4_HH (d, a, b, c, x[ 8], MD4_S32); /* 34 */
+	MD4_HH (c, d, a, b, x[ 4], MD4_S33); /* 35 */
+	MD4_HH (b, c, d, a, x[12], MD4_S34); /* 36 */
+	MD4_HH (a, b, c, d, x[ 2], MD4_S31); /* 37 */
+	MD4_HH (d, a, b, c, x[10], MD4_S32); /* 38 */
+	MD4_HH (c, d, a, b, x[ 6], MD4_S33); /* 39 */
+	MD4_HH (b, c, d, a, x[14], MD4_S34); /* 40 */
+	MD4_HH (a, b, c, d, x[ 1], MD4_S31); /* 41 */
+	MD4_HH (d, a, b, c, x[ 9], MD4_S32); /* 42 */
+	MD4_HH (c, d, a, b, x[ 5], MD4_S33); /* 43 */
+	MD4_HH (b, c, d, a, x[13], MD4_S34); /* 44 */
+	MD4_HH (a, b, c, d, x[ 3], MD4_S31); /* 45 */
+	MD4_HH (d, a, b, c, x[11], MD4_S32); /* 46 */
+	MD4_HH (c, d, a, b, x[ 7], MD4_S33); /* 47 */
+	MD4_HH (b, c, d, a, x[15], MD4_S34); /* 48 */
+
+
+	iState[0] += a;
+	iState[1] += b;
+	iState[2] += c;
+	iState[3] += d;
+
+	// Zeroize sensitive information.
+	Mem::FillZ(x, sizeof(x));
+	}