110 lines
2.6 KiB
C++
110 lines
2.6 KiB
C++
// wake.cpp - written and placed in the public domain by Wei Dai
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#include "pch.h"
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#include "wake.h"
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NAMESPACE_BEGIN(CryptoPP)
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void WAKE_TestInstantiations()
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{
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WAKE_OFB<>::Encryption x2;
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WAKE_OFB<>::Decryption x4;
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}
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inline word32 WAKE_Base::M(word32 x, word32 y)
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{
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word32 w = x+y;
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return (w>>8) ^ t[w & 0xff];
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}
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void WAKE_Base::GenKey(word32 k0, word32 k1, word32 k2, word32 k3)
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{
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// this code is mostly copied from David Wheeler's paper "A Bulk Data Encryption Algorithm"
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signed int x, z, p;
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// 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
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CRYPTOPP_COMPILE_ASSERT(sizeof(x) == 4);
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static unsigned int tt[10]= {
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0x726a8f3b, // table
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0xe69a3b5c,
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0xd3c71fe5,
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0xab3c73d2,
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0x4d3a8eb3,
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0x0396d6e8,
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0x3d4c2f7a,
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0x9ee27cf3, } ;
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t[0] = k0;
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t[1] = k1;
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t[2] = k2;
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t[3] = k3;
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for (p=4 ; p<256 ; p++)
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{
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x=t[p-4]+t[p-1] ; // fill t
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t[p]= (x>>3) ^ tt[x&7] ;
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}
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for (p=0 ; p<23 ; p++)
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t[p]+=t[p+89] ; // mix first entries
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x=t[33] ; z=t[59] | 0x01000001 ;
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z=z&0xff7fffff ;
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for (p=0 ; p<256 ; p++) { //change top byte to
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x=(x&0xff7fffff)+z ; // a permutation etc
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t[p]=(t[p] & 0x00ffffff) ^ x ; }
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t[256]=t[0] ;
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byte y=byte(x);
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for (p=0 ; p<256 ; p++) { // further change perm.
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t[p]=t[y=byte(t[p^y]^y)] ; // and other digits
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t[y]=t[p+1] ; }
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}
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template <class B>
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void WAKE_Policy<B>::CipherSetKey(const NameValuePairs ¶ms, const byte *key, size_t length)
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{
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word32 k0, k1, k2, k3;
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BlockGetAndPut<word32, BigEndian>::Get(key)(r3)(r4)(r5)(r6)(k0)(k1)(k2)(k3);
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GenKey(k0, k1, k2, k3);
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}
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// OFB
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template <class B>
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void WAKE_Policy<B>::OperateKeystream(KeystreamOperation operation, byte *output, const byte *input, size_t iterationCount)
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{
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#define WAKE_OUTPUT(x)\
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while (iterationCount--)\
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{\
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CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, B::ToEnum(), 0, r6);\
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r3 = M(r3, r6);\
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r4 = M(r4, r3);\
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r5 = M(r5, r4);\
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r6 = M(r6, r5);\
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output += 4;\
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if (!(x & INPUT_NULL))\
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input += 4;\
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}
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typedef word32 WordType;
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CRYPTOPP_KEYSTREAM_OUTPUT_SWITCH(WAKE_OUTPUT, 0);
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}
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/*
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template <class B>
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void WAKE_ROFB_Policy<B>::Iterate(KeystreamOperation operation, byte *output, const byte *input, unsigned int iterationCount)
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{
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KeystreamOutput<B> keystreamOperation(operation, output, input);
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while (iterationCount--)
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{
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keystreamOperation(r6);
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r3 = M(r3, r6);
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r4 = M(r4, r3);
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r5 = M(r5, r4);
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r6 = M(r6, r5);
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}
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}
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*/
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template class WAKE_Policy<BigEndian>;
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template class WAKE_Policy<LittleEndian>;
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//template class WAKE_ROFB_Policy<BigEndian>;
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//template class WAKE_ROFB_Policy<LittleEndian>;
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NAMESPACE_END
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