1 files changed, 159 insertions, 0 deletions

diff --git a/CryptoPP/tea.cpp b/CryptoPP/tea.cpp
new file mode 100644
index 000000000..b1fb6f140
--- /dev/null
+++ b/CryptoPP/tea.cpp
@@ -0,0 +1,159 @@
+// tea.cpp - modified by Wei Dai from code in the original paper
+
+#include "pch.h"
+#include "tea.h"
+#include "misc.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+static const word32 DELTA = 0x9e3779b9;
+typedef BlockGetAndPut<word32, BigEndian> Block;
+
+void TEA::Base::UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs &params)
+{
+	AssertValidKeyLength(length);
+
+	GetUserKey(BIG_ENDIAN_ORDER, m_k.begin(), 4, userKey, KEYLENGTH);
+	m_limit = GetRoundsAndThrowIfInvalid(params, this) * DELTA;
+}
+
+void TEA::Enc::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
+{
+	word32 y, z;
+	Block::Get(inBlock)(y)(z);
+
+	word32 sum = 0;
+	while (sum != m_limit)
+	{   
+		sum += DELTA;
+		y += (z << 4) + m_k[0] ^ z + sum ^ (z >> 5) + m_k[1];
+		z += (y << 4) + m_k[2] ^ y + sum ^ (y >> 5) + m_k[3];
+	}
+
+	Block::Put(xorBlock, outBlock)(y)(z);
+}
+
+void TEA::Dec::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
+{
+	word32 y, z;
+	Block::Get(inBlock)(y)(z);
+
+	word32 sum = m_limit;
+	while (sum != 0)
+	{
+		z -= (y << 4) + m_k[2] ^ y + sum ^ (y >> 5) + m_k[3]; 
+		y -= (z << 4) + m_k[0] ^ z + sum ^ (z >> 5) + m_k[1];
+		sum -= DELTA;
+	}
+
+	Block::Put(xorBlock, outBlock)(y)(z);
+}
+
+void XTEA::Base::UncheckedSetKey(const byte *userKey, unsigned int length,  const NameValuePairs &params)
+{
+	AssertValidKeyLength(length);
+
+	GetUserKey(BIG_ENDIAN_ORDER, m_k.begin(), 4, userKey, KEYLENGTH);
+	m_limit = GetRoundsAndThrowIfInvalid(params, this) * DELTA;
+}
+
+void XTEA::Enc::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
+{
+	word32 y, z;
+	Block::Get(inBlock)(y)(z);
+
+#ifdef __SUNPRO_CC
+	// workaround needed on Sun Studio 12u1 Sun C++ 5.10 SunOS_i386 128229-02 2009/09/21
+	size_t sum = 0;
+	while ((sum&0xffffffff) != m_limit)
+#else
+	word32 sum = 0;
+	while (sum != m_limit)
+#endif
+	{   
+		y += (z<<4 ^ z>>5) + z ^ sum + m_k[sum&3];
+		sum += DELTA;
+		z += (y<<4 ^ y>>5) + y ^ sum + m_k[sum>>11 & 3];
+	}
+
+	Block::Put(xorBlock, outBlock)(y)(z);
+}
+
+void XTEA::Dec::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
+{
+	word32 y, z;
+	Block::Get(inBlock)(y)(z);
+
+#ifdef __SUNPRO_CC
+	// workaround needed on Sun Studio 12u1 Sun C++ 5.10 SunOS_i386 128229-02 2009/09/21
+	size_t sum = m_limit;
+	while ((sum&0xffffffff) != 0)
+#else
+	word32 sum = m_limit;
+	while (sum != 0)
+#endif
+	{
+		z -= (y<<4 ^ y>>5) + y ^ sum + m_k[sum>>11 & 3];
+		sum -= DELTA;
+		y -= (z<<4 ^ z>>5) + z ^ sum + m_k[sum&3];
+	}
+
+	Block::Put(xorBlock, outBlock)(y)(z);
+}
+
+#define MX (z>>5^y<<2)+(y>>3^z<<4)^(sum^y)+(m_k[p&3^e]^z)
+
+void BTEA::Enc::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
+{
+	unsigned int n = m_blockSize / 4;
+	word32 *v = (word32*)outBlock;
+	ConditionalByteReverse(BIG_ENDIAN_ORDER, v, (const word32*)inBlock, m_blockSize);
+
+	word32 y = v[0], z = v[n-1], e;
+	word32 p, q = 6+52/n;
+	word32 sum = 0;
+	
+	while (q-- > 0)
+	{   
+		sum += DELTA;
+		e = sum>>2 & 3;
+		for (p = 0; p < n-1; p++)
+		{
+			y = v[p+1];
+			z = v[p] += MX;
+		}
+		y = v[0];
+		z = v[n-1] += MX;
+	}
+
+	ConditionalByteReverse(BIG_ENDIAN_ORDER, v, v, m_blockSize);
+}
+
+void BTEA::Dec::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
+{
+	unsigned int n = m_blockSize / 4;
+	word32 *v = (word32*)outBlock;
+	ConditionalByteReverse(BIG_ENDIAN_ORDER, v, (const word32*)inBlock, m_blockSize);
+
+	word32 y = v[0], z = v[n-1], e;
+	word32 p, q = 6+52/n;
+	word32 sum = q * DELTA;
+
+	while (sum != 0)
+	{   
+		e = sum>>2 & 3;
+		for (p = n-1; p > 0; p--)
+		{
+			z = v[p-1];
+			y = v[p] -= MX;
+		}
+
+		z = v[n-1];
+		y = v[0] -= MX;
+		sum -= DELTA;
+	}
+
+	ConditionalByteReverse(BIG_ENDIAN_ORDER, v, v, m_blockSize);
+}
+
+NAMESPACE_END