First Commit

externals/cryptopp/wake.cpp

@@ -0,0 +1,111 @@
+// wake.cpp - originally written and placed in the public domain by Wei Dai
+
+#include "pch.h"
+
+#include "wake.h"
+#include "smartptr.h"
+
+ANONYMOUS_NAMESPACE_BEGIN
+
+const unsigned int TT[8]= {
+	0x726a8f3b,	0xe69a3b5c, 0xd3c71fe5, 0xab3c73d2,
+	0x4d3a8eb3, 0x0396d6e8, 0x3d4c2f7a, 0x9ee27cf3
+} ;
+
+ANONYMOUS_NAMESPACE_END
+
+NAMESPACE_BEGIN(CryptoPP)
+
+#if defined(CRYPTOPP_DEBUG) && !defined(CRYPTOPP_DOXYGEN_PROCESSING)
+void WAKE_TestInstantiations()
+{
+	WAKE_OFB<>::Encryption x2;
+	WAKE_OFB<>::Decryption x4;
+}
+#endif
+
+inline word32 WAKE_Base::M(word32 x, word32 y)
+{
+	word32 w = x+y;
+	return (w>>8) ^ t[w & 0xff];
+}
+
+void WAKE_Base::GenKey(word32 k0, word32 k1, word32 k2, word32 k3)
+{
+	// this code is mostly copied from David Wheeler's paper "A Bulk Data Encryption Algorithm"
+	signed int x, z, p;
+
+	t[0] = k0;
+	t[1] = k1;
+	t[2] = k2;
+	t[3] = k3;
+	for (p=4 ; p<256 ; p++)
+	{
+	  x=t[p-4]+t[p-1] ; 					   // fill t
+	  t[p]= (x>>3) ^ TT[x&7] ;
+	}
+
+	for (p=0 ; p<23 ; p++)
+		t[p]+=t[p+89] ; 		  // mix first entries
+	x=t[33] ; z=t[59] | 0x01000001 ;
+	z=z&0xff7fffff ;
+	for (p=0 ; p<256 ; p++) {		//change top byte to
+	  x=(x&0xff7fffff)+z ; 		 // a permutation etc
+	  t[p]=(t[p] & 0x00ffffff) ^ x ; }
+
+	t[256]=t[0] ;
+	byte y=byte(x);
+	for (p=0 ; p<256 ; p++) {	  // further change perm.
+	  t[p]=t[y=byte(t[p^y]^y)] ;  // and other digits
+	  t[y]=t[p+1] ;  }
+}
+
+template <class B>
+void WAKE_Policy<B>::CipherSetKey(const NameValuePairs &params, const byte *key, size_t length)
+{
+	CRYPTOPP_UNUSED(params); CRYPTOPP_UNUSED(key); CRYPTOPP_UNUSED(length);
+	word32 k0, k1, k2, k3;
+	BlockGetAndPut<word32, BigEndian>::Get(key)(r3)(r4)(r5)(r6)(k0)(k1)(k2)(k3);
+	GenKey(k0, k1, k2, k3);
+}
+
+// OFB
+template <class B>
+void WAKE_Policy<B>::OperateKeystream(KeystreamOperation operation, byte *output, const byte *input, size_t iterationCount)
+{
+#define WAKE_OUTPUT(x)\
+	while (iterationCount--)\
+	{\
+		CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, B::ToEnum(), 0, r6);\
+		r3 = M(r3, r6);\
+		r4 = M(r4, r3);\
+		r5 = M(r5, r4);\
+		r6 = M(r6, r5);\
+		output += 4;\
+		if (!(x & INPUT_NULL))\
+			input += 4;\
+	}
+
+	typedef word32 WordType;
+	CRYPTOPP_KEYSTREAM_OUTPUT_SWITCH(WAKE_OUTPUT, 0);
+}
+/*
+template <class B>
+void WAKE_ROFB_Policy<B>::Iterate(KeystreamOperation operation, byte *output, const byte *input, unsigned int iterationCount)
+{
+	KeystreamOutput<B> keystreamOperation(operation, output, input);
+
+	while (iterationCount--)
+	{
+		keystreamOperation(r6);
+		r3 = M(r3, r6);
+		r4 = M(r4, r3);
+		r5 = M(r5, r4);
+		r6 = M(r6, r5);
+	}
+}
+*/
+template class WAKE_Policy<BigEndian>;
+template class WAKE_Policy<LittleEndian>;
+
+NAMESPACE_END