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-rw-r--r--CryptoPP/wake.cpp109
1 files changed, 109 insertions, 0 deletions
diff --git a/CryptoPP/wake.cpp b/CryptoPP/wake.cpp
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+// wake.cpp - written and placed in the public domain by Wei Dai
+
+#include "pch.h"
+#include "wake.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+void WAKE_TestInstantiations()
+{
+ WAKE_OFB<>::Encryption x2;
+ WAKE_OFB<>::Decryption x4;
+}
+
+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;
+ // x and z were declared as "long" in Wheeler's paper, which is a signed type. I don't know if that was intentional, but it's too late to change it now. -- Wei 7/4/2010
+ CRYPTOPP_COMPILE_ASSERT(sizeof(x) == 4);
+ static int tt[10]= {
+ 0x726a8f3b, // table
+ 0xe69a3b5c,
+ 0xd3c71fe5,
+ 0xab3c73d2,
+ 0x4d3a8eb3,
+ 0x0396d6e8,
+ 0x3d4c2f7a,
+ 0x9ee27cf3, } ;
+ 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)
+{
+ 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>;
+//template class WAKE_ROFB_Policy<BigEndian>;
+//template class WAKE_ROFB_Policy<LittleEndian>;
+
+NAMESPACE_END