1 extern uint CRCTab[256];
2
SetKey13(const char * Password)3 void CryptData::SetKey13(const char *Password)
4 {
5 Key13[0]=Key13[1]=Key13[2]=0;
6 for (size_t I=0;Password[I]!=0;I++)
7 {
8 byte P=Password[I];
9 Key13[0]+=P;
10 Key13[1]^=P;
11 Key13[2]+=P;
12 Key13[2]=(byte)rotls(Key13[2],1,8);
13 }
14 }
15
16
SetKey15(const char * Password)17 void CryptData::SetKey15(const char *Password)
18 {
19 InitCRC32(CRCTab);
20 uint PswCRC=CRC32(0xffffffff,Password,strlen(Password));
21 Key15[0]=PswCRC&0xffff;
22 Key15[1]=(PswCRC>>16)&0xffff;
23 Key15[2]=Key15[3]=0;
24 for (size_t I=0;Password[I]!=0;I++)
25 {
26 byte P=Password[I];
27 Key15[2]^=P^CRCTab[P];
28 Key15[3]+=P+(CRCTab[P]>>16);
29 }
30 }
31
32
SetAV15Encryption()33 void CryptData::SetAV15Encryption()
34 {
35 InitCRC32(CRCTab);
36 Method=CRYPT_RAR15;
37 Key15[0]=0x4765;
38 Key15[1]=0x9021;
39 Key15[2]=0x7382;
40 Key15[3]=0x5215;
41 }
42
43
SetCmt13Encryption()44 void CryptData::SetCmt13Encryption()
45 {
46 Method=CRYPT_RAR13;
47 Key13[0]=0;
48 Key13[1]=7;
49 Key13[2]=77;
50 }
51
52
Decrypt13(byte * Data,size_t Count)53 void CryptData::Decrypt13(byte *Data,size_t Count)
54 {
55 while (Count--)
56 {
57 Key13[1]+=Key13[2];
58 Key13[0]+=Key13[1];
59 *Data-=Key13[0];
60 Data++;
61 }
62 }
63
64
Crypt15(byte * Data,size_t Count)65 void CryptData::Crypt15(byte *Data,size_t Count)
66 {
67 while (Count--)
68 {
69 Key15[0]+=0x1234;
70 Key15[1]^=CRCTab[(Key15[0] & 0x1fe)>>1];
71 Key15[2]-=CRCTab[(Key15[0] & 0x1fe)>>1]>>16;
72 Key15[0]^=Key15[2];
73 Key15[3]=rotrs(Key15[3]&0xffff,1,16)^Key15[1];
74 Key15[3]=rotrs(Key15[3]&0xffff,1,16);
75 Key15[0]^=Key15[3];
76 *Data^=(byte)(Key15[0]>>8);
77 Data++;
78 }
79 }
80