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