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# wake.cpp

    00001 // wake.cpp - written and placed in the public domain by Wei Dai
    00002
    00003 #include "pch.h"
    00004 #include "wake.h"
    00005
    00006 #include "strciphr.cpp"
    00007
    00008 NAMESPACE_BEGIN(CryptoPP)
    00009
    00010 void WAKE_TestInstantiations()
    00011 {
    00012         WAKE_CFB<>::Encryption x1;
    00013         WAKE_CFB<>::Decryption x3;
    00014         WAKE_OFB<>::Encryption x2;
    00015         WAKE_OFB<>::Decryption x4;
    00016 }
    00017
    00018 inline word32 WAKE_Base::M(word32 x, word32 y)
    00019 {
    00020         word32 w = x+y;
    00021         return (w>>8) ^ t[(byte)w];
    00022 }
    00023
    00024 void WAKE_Base::GenKey(word32 k0, word32 k1, word32 k2, word32 k3)
    00025 {
    00026         long x, z;
    00027         int p ;
    00028         static long tt[10]= {
    00029                 0x726a8f3bL,                                                             // table
    00030                 0xe69a3b5cL,
    00031                 0xd3c71fe5L,
    00032                 0xab3c73d2L,
    00033                 0x4d3a8eb3L,
    00034                 0x0396d6e8L,
    00035                 0x3d4c2f7aL,
    00036                 0x9ee27cf3L, } ;
    00037         t[0] = k0;
    00038         t[1] = k1;
    00039         t[2] = k2;
    00040         t[3] = k3;
    00041         for (p=4 ; p<256 ; p++)
    00042         {
    00043           x=t[p-4]+t[p-1] ;                                        // fill t
    00044           t[p]= (x>>3) ^ tt[byte(x&7)] ;
    00045         }
    00046
    00047         for (p=0 ; p<23 ; p++)
    00048                 t[p]+=t[p+89] ;                   // mix first entries
    00049         x=t[33] ; z=t[59] | 0x01000001L ;
    00050         z=z&0xff7fffffL ;
    00051         for (p=0 ; p<256 ; p++) {               //change top byte to
    00052           x=(x&0xff7fffffL)+z ;                  // a permutation etc
    00053           t[p]=(t[p] & 0x00ffffffL) ^ x ; }
    00054
    00055         t[256]=t[0] ;
    00056         byte y=byte(x);
    00057         for (p=0 ; p<256 ; p++) {         // further change perm.
    00058           t[p]=t[y=byte(t[p^y]^y)] ;  // and other digits
    00059           t[y]=t[p+1] ;  }
    00060 }
    00061
    00062 template <class B>
    00063 void WAKE_Policy<B>::CipherSetKey(const NameValuePairs &params, const byte *key, size_t length)
    00064 {
    00065         word32 k0, k1, k2, k3;
    00066         BlockGetAndPut<word32, BigEndian, false>::Get(key)(r3)(r4)(r5)(r6)(k0)(k1)(k2)(k3);
    00067         GenKey(k0, k1, k2, k3);
    00068 }
    00069
    00070 // CFB
    00071 template <class B>
    00072 void WAKE_Policy<B>::Iterate(byte *output, const byte *input, CipherDir dir, size_t iterationCount)
    00073 {
    00074         RegisterOutput<B> registerOutput(output, input, dir);
    00075
    00076         while (iterationCount--)
    00077         {
    00078                 r3 = M(r3, ConditionalByteReverse(B::ToEnum(), r6));
    00079                 r4 = M(r4, r3);
    00080                 r5 = M(r5, r4);
    00081                 r6 = M(r6, r5);
    00082                 registerOutput(r6);
    00083         }
    00084 }
    00085
    00086 // OFB
    00087 template <class B>
    00088 void WAKE_Policy<B>::OperateKeystream(KeystreamOperation operation, byte *output, const byte *input, size_t iterationCount)
    00089 {
    00090         KeystreamOutput<B> keystreamOperation(operation, output, input);
    00091
    00092         while (iterationCount--)
    00093         {
    00094                 keystreamOperation(r6);
    00095                 r3 = M(r3, r6);
    00096                 r4 = M(r4, r3);
    00097                 r5 = M(r5, r4);
    00098                 r6 = M(r6, r5);
    00099         }
    00100 }
    00101 /*
    00102 template <class B>
    00103 void WAKE_ROFB_Policy<B>::Iterate(KeystreamOperation operation, byte *output, const byte *input, unsigned int iterationCount)
    00104 {
    00105         KeystreamOutput<B> keystreamOperation(operation, output, input);
    00106
    00107         while (iterationCount--)
    00108         {
    00109                 keystreamOperation(r6);
    00110                 r3 = M(r3, r6);
    00111                 r4 = M(r4, r3);
    00112                 r5 = M(r5, r4);
    00113                 r6 = M(r6, r5);
    00114         }
    00115 }
    00116 */
    00117 template class WAKE_Policy<BigEndian>;
    00118 template class WAKE_Policy<LittleEndian>;
    00119 //template class WAKE_ROFB_Policy<BigEndian>;
    00120 //template class WAKE_ROFB_Policy<LittleEndian>;
    00121
    00122 NAMESPACE_END