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#define NROUNDS 32
#define substLong(t) ( (uint)SubstTable20[(uint)t&255] | \
((uint)SubstTable20[(int)(t>> 8)&255]<< 8) | \
((uint)SubstTable20[(int)(t>>16)&255]<<16) | \
((uint)SubstTable20[(int)(t>>24)&255]<<24) )
static byte InitSubstTable20[256]={
215, 19,149, 35, 73,197,192,205,249, 28, 16,119, 48,221, 2, 42,
232, 1,177,233, 14, 88,219, 25,223,195,244, 90, 87,239,153,137,
255,199,147, 70, 92, 66,246, 13,216, 40, 62, 29,217,230, 86, 6,
71, 24,171,196,101,113,218,123, 93, 91,163,178,202, 67, 44,235,
107,250, 75,234, 49,167,125,211, 83,114,157,144, 32,193,143, 36,
158,124,247,187, 89,214,141, 47,121,228, 61,130,213,194,174,251,
97,110, 54,229,115, 57,152, 94,105,243,212, 55,209,245, 63, 11,
164,200, 31,156, 81,176,227, 21, 76, 99,139,188,127, 17,248, 51,
207,120,189,210, 8,226, 41, 72,183,203,135,165,166, 60, 98, 7,
122, 38,155,170, 69,172,252,238, 39,134, 59,128,236, 27,240, 80,
131, 3, 85,206,145, 79,154,142,159,220,201,133, 74, 64, 20,129,
224,185,138,103,173,182, 43, 34,254, 82,198,151,231,180, 58, 10,
118, 26,102, 12, 50,132, 22,191,136,111,162,179, 45, 4,148,108,
161, 56, 78,126,242,222, 15,175,146, 23, 33,241,181,190, 77,225,
0, 46,169,186, 68, 95,237, 65, 53,208,253,168, 9, 18,100, 52,
116,184,160, 96,109, 37, 30,106,140,104,150, 5,204,117,112, 84
};
void CryptData::SetKey20(const char *Password)
{
InitCRC32(CRCTab);
char Psw[MAXPASSWORD];
strncpyz(Psw,Password,ASIZE(Psw)); // We'll need to modify it below.
size_t PswLength=strlen(Psw);
Key20[0]=0xD3A3B879L;
Key20[1]=0x3F6D12F7L;
Key20[2]=0x7515A235L;
Key20[3]=0xA4E7F123L;
memcpy(SubstTable20,InitSubstTable20,sizeof(SubstTable20));
for (uint J=0;J<256;J++)
for (size_t I=0;I<PswLength;I+=2)
{
uint N1=(byte)CRCTab [ (byte(Password[I]) - J) &0xff];
uint N2=(byte)CRCTab [ (byte(Password[I+1]) + J) &0xff];
for (int K=1;N1!=N2;N1=(N1+1)&0xff,K++)
Swap20(&SubstTable20[N1],&SubstTable20[(N1+I+K)&0xff]);
}
// Incomplete last block of password must be zero padded.
if ((PswLength & CRYPT_BLOCK_MASK)!=0)
for (size_t I=PswLength;I<=(PswLength|CRYPT_BLOCK_MASK);I++)
Psw[I]=0;
for (size_t I=0;I<PswLength;I+=CRYPT_BLOCK_SIZE)
EncryptBlock20((byte *)Psw+I);
}
void CryptData::EncryptBlock20(byte *Buf)
{
uint A,B,C,D,T,TA,TB;
A=RawGet4(Buf+0)^Key20[0];
B=RawGet4(Buf+4)^Key20[1];
C=RawGet4(Buf+8)^Key20[2];
D=RawGet4(Buf+12)^Key20[3];
for(int I=0;I<NROUNDS;I++)
{
T=((C+rotls(D,11,32))^Key20[I&3]);
TA=A^substLong(T);
T=((D^rotls(C,17,32))+Key20[I&3]);
TB=B^substLong(T);
A=C;
B=D;
C=TA;
D=TB;
}
RawPut4(C^Key20[0],Buf+0);
RawPut4(D^Key20[1],Buf+4);
RawPut4(A^Key20[2],Buf+8);
RawPut4(B^Key20[3],Buf+12);
UpdKeys20(Buf);
}
void CryptData::DecryptBlock20(byte *Buf)
{
byte InBuf[16];
uint A,B,C,D,T,TA,TB;
A=RawGet4(Buf+0)^Key20[0];
B=RawGet4(Buf+4)^Key20[1];
C=RawGet4(Buf+8)^Key20[2];
D=RawGet4(Buf+12)^Key20[3];
memcpy(InBuf,Buf,sizeof(InBuf));
for(int I=NROUNDS-1;I>=0;I--)
{
T=((C+rotls(D,11,32))^Key20[I&3]);
TA=A^substLong(T);
T=((D^rotls(C,17,32))+Key20[I&3]);
TB=B^substLong(T);
A=C;
B=D;
C=TA;
D=TB;
}
RawPut4(C^Key20[0],Buf+0);
RawPut4(D^Key20[1],Buf+4);
RawPut4(A^Key20[2],Buf+8);
RawPut4(B^Key20[3],Buf+12);
UpdKeys20(InBuf);
}
void CryptData::UpdKeys20(byte *Buf)
{
for (int I=0;I<16;I+=4)
{
Key20[0]^=CRCTab[Buf[I]];
Key20[1]^=CRCTab[Buf[I+1]];
Key20[2]^=CRCTab[Buf[I+2]];
Key20[3]^=CRCTab[Buf[I+3]];
}
}
void CryptData::Swap20(byte *Ch1,byte *Ch2)
{
byte Ch=*Ch1;
*Ch1=*Ch2;
*Ch2=Ch;
}
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