diff --git a/Readme.txt b/Readme.txt
index 09239172..c7e1c650 100644
--- a/Readme.txt
+++ b/Readme.txt
@@ -1,5 +1,5 @@
 Crypto++: a C++ Class Library of Cryptographic Primitives
-Version 5.1 (in development)
+Version 5.1 3/20/2003
 
 This library includes:
 
@@ -242,11 +242,11 @@ History
 5.01 (special FIPS 140-2 release, in development)
     - added known answer test for X9.17 RNG in FIPS 140 power-up self test
 
-5.1 (in development)
-    - added PSS padding and changed PSSR to track IEEE P1363a draft standard
+5.1 - added PSS padding and changed PSSR to track IEEE P1363a draft standard
     - added blinding for RSA and Rabin to defend against timing attacks
+      against decryption operations (required API changes for decryption)
     - fixed a bug in CBC and ECB modes with processing non-aligned data
     - fixed standard conformance bugs in DLIES (DHAES mode) and RW/EMSA2
-	  signature scheme (these fixes are not backwards compatible)
-	- fixed a number of minor bugs and portability problems
-	- removed Sapphire
+      signature scheme (these fixes are not backwards compatible)
+    - fixed a number of minor bugs and portability problems
+    - removed Sapphire
diff --git a/blumshub.cpp b/blumshub.cpp
index f715c84e..40c654af 100644
--- a/blumshub.cpp
+++ b/blumshub.cpp
@@ -41,9 +41,11 @@ BlumBlumShub::BlumBlumShub(const Integer &p, const Integer &q, const Integer &se
 
 void BlumBlumShub::Seek(dword index)
 {
-	Integer e = a_exp_b_mod_c (2, ((index*8) / maxBits + 1), (p-1)*(q-1));
+	Integer i(Integer::POSITIVE, HIGH_WORD(index), word(index));
+	i *= 8;
+	Integer e = a_exp_b_mod_c (2, i / maxBits + 1, (p-1)*(q-1));
 	current = modn.Exponentiate(x0, e);
-	bitsLeft = maxBits - int((index*8) % maxBits);
+	bitsLeft = maxBits - i % maxBits;
 }
 
 NAMESPACE_END
diff --git a/blumshub.h b/blumshub.h
index 10b3cac3..dbbb8be4 100644
--- a/blumshub.h
+++ b/blumshub.h
@@ -29,7 +29,7 @@ public:
 
 protected:
 	const ModularArithmetic modn;
-	const int maxBits;
+	const word maxBits;
 	Integer current;
 	int bitsLeft;
 
diff --git a/datatest.cpp b/datatest.cpp
index eac1d7f1..5d84c017 100644
--- a/datatest.cpp
+++ b/datatest.cpp
@@ -281,6 +281,7 @@ void TestDigestOrMAC(TestData &v, bool testDigest)
 
 bool GetField(std::istream &is, std::string &name, std::string &value)
 {
+	name.clear();
 	is >> name;
 	if (name.empty())
 		return false;
@@ -293,8 +294,8 @@ bool GetField(std::istream &is, std::string &name, std::string &value)
 		is.ignore(1);
 
 	// VC60 workaround: getline bug
-	char buffer[4];
-	value.resize(0);
+	char buffer[128];
+	value.clear();
 	bool continueLine;
 
 	do
@@ -421,7 +422,7 @@ void TestDataFile(const std::string &filename, unsigned int &totalTests, unsigne
 				failedTests++;
 			}
 			else
-				cout << ".";
+				cout << "." << flush;
 
 			totalTests++;
 		}
diff --git a/ida.cpp b/ida.cpp
index d52e443b..3bec9f80 100644
--- a/ida.cpp
+++ b/ida.cpp
@@ -45,7 +45,7 @@ void RawIDA::ChannelInitialize(const string &channel, const NameValuePairs &para
 	else
 	{
 		int nShares = parameters.GetIntValueWithDefault("NumberOfShares", m_threshold);
-		for (unsigned int i=0; i<nShares; i++)
+		for (int i=0; i<nShares; i++)
 			AddOutputChannel(i);
 	}
 
@@ -93,7 +93,7 @@ unsigned int RawIDA::LookupInputChannel(word32 channelId) const
 
 void RawIDA::ChannelData(word32 channelId, const byte *inString, unsigned int length, bool messageEnd)
 {
-	unsigned int i = InsertInputChannel(channelId);
+	int i = InsertInputChannel(channelId);
 	if (i < m_threshold)
 	{
 		unsigned long size = m_inputQueues[i].MaxRetrievable();
@@ -125,7 +125,7 @@ void RawIDA::ChannelData(word32 channelId, const byte *inString, unsigned int le
 
 unsigned int RawIDA::InputBuffered(word32 channelId) const
 {
-	unsigned int i = LookupInputChannel(channelId);
+	int i = LookupInputChannel(channelId);
 	return i < m_threshold ? m_inputQueues[i].MaxRetrievable() : 0;
 }
 
@@ -165,7 +165,7 @@ void RawIDA::PrepareInterpolation()
 void RawIDA::ProcessInputQueues()
 {
 	bool finished = (m_channelsFinished == m_threshold);
-	unsigned int i;
+	int i;
 
 	while (finished ? m_channelsReady > 0 : m_channelsReady == m_threshold)
 	{
@@ -181,7 +181,7 @@ void RawIDA::ProcessInputQueues()
 				m_channelsReady += queue.NumberOfMessages() > 0 || queue.MaxRetrievable() >= 4;
 		}
 
-		for (i=0; i<m_outputChannelIds.size(); i++)
+		for (i=0; (unsigned int)i<m_outputChannelIds.size(); i++)
 		{
 			if (m_outputToInput[i] != m_threshold)
 				m_outputQueues[i].PutWord32(m_y[m_outputToInput[i]]);
diff --git a/integer.cpp b/integer.cpp
index 2a5f19e0..e18507fd 100644
--- a/integer.cpp
+++ b/integer.cpp
@@ -2562,6 +2562,13 @@ Integer::Integer(signed long value)
 	reg[1] = word(SafeRightShift<WORD_BITS, unsigned long>(value));
 }
 
+Integer::Integer(Sign s, word high, word low)
+	: reg(2), sign(s)
+{
+	reg[0] = low;
+	reg[1] = high;
+}
+
 bool Integer::IsConvertableToLong() const
 {
 	if (ByteCount() > sizeof(long))
diff --git a/integer.h b/integer.h
index b79c07cc..fcf3ebef 100644
--- a/integer.h
+++ b/integer.h
@@ -66,6 +66,9 @@ public:
 			RandomNumberNotFound() : Exception(OTHER_ERROR, "Integer: no integer satisfies the given parameters") {}
 		};
 
+		//!
+		enum Sign {POSITIVE=0, NEGATIVE=1};
+
 		//!
 		enum Signedness {
 		//!
@@ -92,6 +95,9 @@ public:
 		//! convert from signed long
 		Integer(signed long value);
 
+		//! convert from two words
+		Integer(Sign s, word highWord, word lowWord);
+
 		//! convert from string
 		/*! str can be in base 2, 8, 10, or 16.  Base is determined by a
 			case insensitive suffix of 'h', 'o', or 'b'.  No suffix means base 10.
@@ -390,8 +396,6 @@ private:
 	friend void PositiveMultiply(Integer &product, const Integer &a, const Integer &b);
 	friend void PositiveDivide(Integer &remainder, Integer &quotient, const Integer &dividend, const Integer &divisor);
 
-	enum Sign {POSITIVE=0, NEGATIVE=1};
-
 	SecAlignedWordBlock reg;
 	Sign sign;
 };
diff --git a/pssr.cpp b/pssr.cpp
index 020cb989..5dc959aa 100644
--- a/pssr.cpp
+++ b/pssr.cpp
@@ -68,7 +68,7 @@ void PSSR_MEM_Base::ComputeMessageRepresentative(RandomNumberGenerator &rng,
 	memcpy(representative + representativeByteLength - u, hashIdentifier.first, hashIdentifier.second);
 	representative[representativeByteLength - 1] = hashIdentifier.second ? 0xcc : 0xbc;
 	if (representativeBitLength % 8 != 0)
-		representative[0] = Crop(representative[0], representativeBitLength % 8);
+		representative[0] = (byte)Crop(representative[0], representativeBitLength % 8);
 }
 
 DecodingResult PSSR_MEM_Base::RecoverMessageFromRepresentative(
@@ -94,12 +94,12 @@ DecodingResult PSSR_MEM_Base::RecoverMessageFromRepresentative(
 
 	GetMGF().GenerateAndMask(hash, representative, representativeByteLength - u - digestSize, h, digestSize);
 	if (representativeBitLength % 8 != 0)
-		representative[0] = Crop(representative[0], representativeBitLength % 8);
+		representative[0] = (byte)Crop(representative[0], representativeBitLength % 8);
 
 	// extract salt and recoverableMessage from DB = 00 ... || 01 || M || salt
 	byte *salt = representative + representativeByteLength - u - digestSize - saltSize;
 	byte *M = std::find_if(representative, salt-1, std::bind2nd(std::not_equal_to<byte>(), 0));
-	if (*M == 0x01 && M - representative - (representativeBitLength % 8 != 0) >= MinPadLen(digestSize))
+	if (*M == 0x01 && (unsigned int)(M - representative - (representativeBitLength % 8 != 0)) >= MinPadLen(digestSize))
 	{
 		recoverableMessageLength = salt-M-1;
 		memcpy(recoverableMessage, M+1, recoverableMessageLength);
diff --git a/rsa.cpp b/rsa.cpp
index 9d690b95..62e95921 100644
--- a/rsa.cpp
+++ b/rsa.cpp
@@ -26,17 +26,17 @@ void RSA_TestInstantiations()
 	RSASS<PKCS1v15, SHA>::Verifier x3(x2);
 	RSASS<PKCS1v15, SHA>::Verifier x4(x2.GetKey());
 	RSASS<PSS, SHA>::Verifier x5(x3);
+#ifndef __MWERKS__
 	RSASS<PSSR, SHA>::Signer x6 = x2;
+	x3 = x2;
+	x6 = x2;
+#endif
 	RSAES<PKCS1v15>::Encryptor x7(x2);
 #ifndef __GNUC__
 	RSAES<PKCS1v15>::Encryptor x8(x3);
 #endif
 	RSAES<OAEP<SHA> >::Encryptor x9(x2);
 
-	x6 = x2;
-#ifndef __MWERKS__
-	x3 = x2;
-#endif
 	x4 = x2.GetKey();
 }
 #endif
diff --git a/seal.cpp b/seal.cpp
index eaae7a77..97362233 100644
--- a/seal.cpp
+++ b/seal.cpp
@@ -77,8 +77,8 @@ void SEAL_Policy<B>::CipherResynchronize(byte *keystreamBuffer, const byte *IV)
 template <class B>
 void SEAL_Policy<B>::SeekToIteration(dword iterationCount)
 {
-	m_outsideCounter = m_startCount + iterationCount / m_iterationsPerCount;
-	m_insideCounter = iterationCount % m_iterationsPerCount;
+	m_outsideCounter = m_startCount + (unsigned int)(iterationCount / m_iterationsPerCount);
+	m_insideCounter = (unsigned int)(iterationCount % m_iterationsPerCount);
 }
 
 template <class B>
diff --git a/shark.cpp b/shark.cpp
index fff3bfda..0408d8e1 100644
--- a/shark.cpp
+++ b/shark.cpp
@@ -28,7 +28,7 @@ static word64 SHARKTransform(word64 a)
 	GF256 gf256(0xf5);
 	for (unsigned int i=0; i<8; i++)
 		for(unsigned int j=0; j<8; j++) 
-			result ^= word64(gf256.Multiply(iG[i][j], a>>(56-8*j))) << (56-8*i);
+			result ^= word64(gf256.Multiply(iG[i][j], GF256::Element(a>>(56-8*j)))) << (56-8*i);
 	return result;
 }
 
diff --git a/strciphr.cpp b/strciphr.cpp
index 78e1a3f0..d948c579 100644
--- a/strciphr.cpp
+++ b/strciphr.cpp
@@ -99,7 +99,7 @@ void AdditiveCipherTemplate<BASE>::Seek(dword position)
 	if (position > 0)
 	{
 		policy.WriteKeystream(m_buffer, 1);
-		m_leftOver = bytesPerIteration - position;
+		m_leftOver = bytesPerIteration - (unsigned int)position;
 	}
 	else
 		m_leftOver = 0;
diff --git a/test.cpp b/test.cpp
index f12b199a..21eb4f3c 100644
--- a/test.cpp
+++ b/test.cpp
@@ -638,7 +638,7 @@ void SecretShareFile(int threshold, int nShares, const char *filename, const cha
 
 	vector_member_ptrs<FileSink> fileSinks(nShares);
 	string channel;
-	for (unsigned int i=0; i<nShares; i++)
+	for (int i=0; i<nShares; i++)
 	{
 		char extension[5] = ".000";
 		extension[1]='0'+byte(i/100);
@@ -662,7 +662,7 @@ void SecretRecoverFile(int threshold, const char *outFilename, char *const *inFi
 
 	vector_member_ptrs<FileSource> fileSources(threshold);
 	SecByteBlock channel(4);
-	unsigned int i;
+	int i;
 	for (i=0; i<threshold; i++)
 	{
 		fileSources[i].reset(new FileSource(inFilenames[i], false));
diff --git a/validat1.cpp b/validat1.cpp
index b4b6fa70..5619589e 100644
--- a/validat1.cpp
+++ b/validat1.cpp
@@ -240,7 +240,7 @@ bool TestOS_RNG()
 		time_t t = time(NULL), t1 = 0;
 
 		// check that it doesn't take too long to generate a reasonable amount of randomness
-		while (total < 16 && (t1 < 10 || total*8 > t1))
+		while (total < 16 && (t1 < 10 || total*8 > (unsigned long)t1))
 		{
 			test.Pump(1);
 			total += 1;
diff --git a/wait.cpp b/wait.cpp
index c97d7140..99a2ad49 100644
--- a/wait.cpp
+++ b/wait.cpp
@@ -94,7 +94,7 @@ DWORD WINAPI WaitingThread(LPVOID lParam)
 		handles[0] = thread.stopWaiting;
 		std::copy(thread.waitHandles, thread.waitHandles+thread.count, handles.begin()+1);
 
-		DWORD result = ::WaitForMultipleObjects(handles.size(), handles.begin(), FALSE, INFINITE);
+		DWORD result = ::WaitForMultipleObjects(handles.size(), &handles[0], FALSE, INFINITE);
 
 		if (result == WAIT_OBJECT_0)
 			continue;	// another thread finished waiting first, so do nothing
@@ -154,7 +154,7 @@ bool WaitObjectContainer::Wait(unsigned long milliseconds)
 				Sleep(0);
 			if (i<nThreads)
 			{
-				thread.waitHandles = m_handles.begin() + i*WAIT_OBJECTS_PER_THREAD;
+				thread.waitHandles = &m_handles[i*WAIT_OBJECTS_PER_THREAD];
 				thread.count = STDMIN(WAIT_OBJECTS_PER_THREAD, m_handles.size() - i*WAIT_OBJECTS_PER_THREAD);
 				thread.error = &error;
 			}