void CryptData::DecryptBlock20(unsigned char *Buf)
{
unsigned char InBuf[16];
unsigned int A,B,C,D,T,TA,TB;
#if defined(BIG_ENDIAN) || !defined(PRESENT_INT32) || !defined(ALLOW_NOT_ALIGNED_INT)
A=((unsigned int)Buf[0]|((unsigned int)Buf[1]<<8)|((unsigned int)Buf[2]<<16)|((unsigned int)Buf[3]<<24))^Key[0];
B=((unsigned int)Buf[4]|((unsigned int)Buf[5]<<8)|((unsigned int)Buf[6]<<16)|((unsigned int)Buf[7]<<24))^Key[1];
C=((unsigned int)Buf[8]|((unsigned int)Buf[9]<<8)|((unsigned int)Buf[10]<<16)|((unsigned int)Buf[11]<<24))^Key[2];
D=((unsigned int)Buf[12]|((unsigned int)Buf[13]<<8)|((unsigned int)Buf[14]<<16)|((unsigned int)Buf[15]<<24))^Key[3];
#else
uint32 *BufPtr=(uint32 *)Buf;
A=BufPtr[0]^Key[0];
B=BufPtr[1]^Key[1];
C=BufPtr[2]^Key[2];
D=BufPtr[3]^Key[3];
#endif
memcpy(InBuf,Buf,sizeof(InBuf));
for(int I=NROUNDS-1;I>=0;I--)
{
T=((C+rol(D,11,32))^Key[I&3]);
TA=A^substLong(T);
T=((D^rol(C,17,32))+Key[I&3]);
TB=B^substLong(T);
A=C;
B=D;
C=TA;
D=TB;
}
#if defined(BIG_ENDIAN) || !defined(PRESENT_INT32) || !defined(ALLOW_NOT_ALIGNED_INT)
C^=Key[0];
Buf[0]=(unsigned char)C;
Buf[1]=(unsigned char)(C>>8);
Buf[2]=(unsigned char)(C>>16);
Buf[3]=(unsigned char)(C>>24);
D^=Key[1];
Buf[4]=(unsigned char)D;
Buf[5]=(unsigned char)(D>>8);
Buf[6]=(unsigned char)(D>>16);
Buf[7]=(unsigned char)(D>>24);
A^=Key[2];
Buf[8]=(unsigned char)A;
Buf[9]=(unsigned char)(A>>8);
Buf[10]=(unsigned char)(A>>16);
Buf[11]=(unsigned char)(A>>24);
B^=Key[3];
Buf[12]=(unsigned char)B;
Buf[13]=(unsigned char)(B>>8);
Buf[14]=(unsigned char)(B>>16);
Buf[15]=(unsigned char)(B>>24);
#else
BufPtr[0]=C^Key[0];
BufPtr[1]=D^Key[1];
BufPtr[2]=A^Key[2];
BufPtr[3]=B^Key[3];
#endif
UpdKeys(InBuf);
}
void CryptData::EncryptBlock20(byte *Buf)
{
uint A,B,C,D,T,TA,TB;
#if defined(BIG_ENDIAN) || !defined(PRESENT_INT32) || !defined(ALLOW_NOT_ALIGNED_INT)
A=((uint)Buf[0]|((uint)Buf[1]<<8)|((uint)Buf[2]<<16)|((uint)Buf[3]<<24))^Key[0];
B=((uint)Buf[4]|((uint)Buf[5]<<8)|((uint)Buf[6]<<16)|((uint)Buf[7]<<24))^Key[1];
C=((uint)Buf[8]|((uint)Buf[9]<<8)|((uint)Buf[10]<<16)|((uint)Buf[11]<<24))^Key[2];
D=((uint)Buf[12]|((uint)Buf[13]<<8)|((uint)Buf[14]<<16)|((uint)Buf[15]<<24))^Key[3];
#else
uint32 *BufPtr=(uint32 *)Buf;
A=BufPtr[0]^Key[0];
B=BufPtr[1]^Key[1];
C=BufPtr[2]^Key[2];
D=BufPtr[3]^Key[3];
#endif
for(int I=0;I<NROUNDS;I++)
{
T=((C+rol(D,11,32))^Key[I&3]);
TA=A^substLong(T);
T=((D^rol(C,17,32))+Key[I&3]);
TB=B^substLong(T);
A=C;
B=D;
C=TA;
D=TB;
}
#if defined(BIG_ENDIAN) || !defined(PRESENT_INT32) || !defined(ALLOW_NOT_ALIGNED_INT)
C^=Key[0];
Buf[0]=(byte)C;
Buf[1]=(byte)(C>>8);
Buf[2]=(byte)(C>>16);
Buf[3]=(byte)(C>>24);
D^=Key[1];
Buf[4]=(byte)D;
Buf[5]=(byte)(D>>8);
Buf[6]=(byte)(D>>16);
Buf[7]=(byte)(D>>24);
A^=Key[2];
Buf[8]=(byte)A;
Buf[9]=(byte)(A>>8);
Buf[10]=(byte)(A>>16);
Buf[11]=(byte)(A>>24);
B^=Key[3];
Buf[12]=(byte)B;
Buf[13]=(byte)(B>>8);
Buf[14]=(byte)(B>>16);
Buf[15]=(byte)(B>>24);
#else
BufPtr[0]=C^Key[0];
BufPtr[1]=D^Key[1];
BufPtr[2]=A^Key[2];
BufPtr[3]=B^Key[3];
#endif
UpdKeys(Buf);
}
