1 files changed, 123 insertions, 0 deletions
diff --git a/CryptoPP/serpent.cpp b/CryptoPP/serpent.cpp
new file mode 100644
index 000000000..40fab23d7
--- /dev/null
+++ b/CryptoPP/serpent.cpp
@@ -0,0 +1,123 @@
+// serpent.cpp - written and placed in the public domain by Wei Dai
+
+#include "pch.h"
+#include "serpent.h"
+#include "misc.h"
+
+#include "serpentp.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+void Serpent_KeySchedule(word32 *k, unsigned int rounds, const byte *userKey, size_t keylen)
+{
+	FixedSizeSecBlock<word32, 8> k0;
+	GetUserKey(LITTLE_ENDIAN_ORDER, k0.begin(), 8, userKey, keylen);
+	if (keylen < 32)
+		k0[keylen/4] |= word32(1) << ((keylen%4)*8);
+
+	word32 t = k0[7];
+	unsigned int i;
+	for (i = 0; i < 8; ++i)
+		k[i] = k0[i] = t = rotlFixed(k0[i] ^ k0[(i+3)%8] ^ k0[(i+5)%8] ^ t ^ 0x9e3779b9 ^ i, 11);
+	for (i = 8; i < 4*(rounds+1); ++i)
+		k[i] = t = rotlFixed(k[i-8] ^ k[i-5] ^ k[i-3] ^ t ^ 0x9e3779b9 ^ i, 11);
+	k -= 20;
+
+	word32 a,b,c,d,e;
+	for (i=0; i<rounds/8; i++)
+	{
+		afterS2(LK); afterS2(S3); afterS3(SK);
+		afterS1(LK); afterS1(S2); afterS2(SK);
+		afterS0(LK); afterS0(S1); afterS1(SK);
+		beforeS0(LK); beforeS0(S0); afterS0(SK);
+		k += 8*4;
+		afterS6(LK); afterS6(S7); afterS7(SK);
+		afterS5(LK); afterS5(S6); afterS6(SK);
+		afterS4(LK); afterS4(S5); afterS5(SK);
+		afterS3(LK); afterS3(S4); afterS4(SK);
+	}
+	afterS2(LK); afterS2(S3); afterS3(SK);
+}
+
+void Serpent::Base::UncheckedSetKey(const byte *userKey, unsigned int keylen, const NameValuePairs &)
+{
+	AssertValidKeyLength(keylen);
+	Serpent_KeySchedule(m_key, 32, userKey, keylen);
+}
+
+typedef BlockGetAndPut<word32, LittleEndian> Block;
+
+void Serpent::Enc::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
+{
+	word32 a, b, c, d, e;
+	
+	Block::Get(inBlock)(a)(b)(c)(d);
+
+	const word32 *k = m_key;
+	unsigned int i=1;
+
+	do
+	{
+		beforeS0(KX); beforeS0(S0); afterS0(LT);
+		afterS0(KX); afterS0(S1); afterS1(LT);
+		afterS1(KX); afterS1(S2); afterS2(LT);
+		afterS2(KX); afterS2(S3); afterS3(LT);
+		afterS3(KX); afterS3(S4); afterS4(LT);
+		afterS4(KX); afterS4(S5); afterS5(LT);
+		afterS5(KX); afterS5(S6); afterS6(LT);
+		afterS6(KX); afterS6(S7);
+
+		if (i == 4)
+			break;
+
+		++i;
+		c = b;
+		b = e;
+		e = d;
+		d = a;
+		a = e;
+		k += 32;
+		beforeS0(LT);
+	}
+	while (true);
+
+	afterS7(KX);
+	
+	Block::Put(xorBlock, outBlock)(d)(e)(b)(a);
+}
+
+void Serpent::Dec::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
+{
+	word32 a, b, c, d, e;
+	
+	Block::Get(inBlock)(a)(b)(c)(d);
+
+	const word32 *k = m_key + 96;
+	unsigned int i=4;
+
+	beforeI7(KX);
+	goto start;
+
+	do
+	{
+		c = b;
+		b = d;
+		d = e;
+		k -= 32;
+		beforeI7(ILT);
+start:
+		            beforeI7(I7); afterI7(KX); 
+		afterI7(ILT); afterI7(I6); afterI6(KX); 
+		afterI6(ILT); afterI6(I5); afterI5(KX); 
+		afterI5(ILT); afterI5(I4); afterI4(KX); 
+		afterI4(ILT); afterI4(I3); afterI3(KX); 
+		afterI3(ILT); afterI3(I2); afterI2(KX); 
+		afterI2(ILT); afterI2(I1); afterI1(KX); 
+		afterI1(ILT); afterI1(I0); afterI0(KX);
+	}
+	while (--i != 0);
+	
+	Block::Put(xorBlock, outBlock)(a)(d)(b)(e);
+}
+
+NAMESPACE_END