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Diffstat (limited to 'utils/themeeditor/quazip/crypt.h')
-rw-r--r-- | utils/themeeditor/quazip/crypt.h | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/utils/themeeditor/quazip/crypt.h b/utils/themeeditor/quazip/crypt.h new file mode 100644 index 0000000000..82748c5715 --- /dev/null +++ b/utils/themeeditor/quazip/crypt.h | |||
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1 | /* crypt.h -- base code for crypt/uncrypt ZIPfile | ||
2 | |||
3 | |||
4 | Version 1.01e, February 12th, 2005 | ||
5 | |||
6 | Copyright (C) 1998-2005 Gilles Vollant | ||
7 | |||
8 | This code is a modified version of crypting code in Infozip distribution | ||
9 | |||
10 | The encryption/decryption parts of this source code (as opposed to the | ||
11 | non-echoing password parts) were originally written in Europe. The | ||
12 | whole source package can be freely distributed, including from the USA. | ||
13 | (Prior to January 2000, re-export from the US was a violation of US law.) | ||
14 | |||
15 | This encryption code is a direct transcription of the algorithm from | ||
16 | Roger Schlafly, described by Phil Katz in the file appnote.txt. This | ||
17 | file (appnote.txt) is distributed with the PKZIP program (even in the | ||
18 | version without encryption capabilities). | ||
19 | |||
20 | If you don't need crypting in your application, just define symbols | ||
21 | NOCRYPT and NOUNCRYPT. | ||
22 | |||
23 | This code support the "Traditional PKWARE Encryption". | ||
24 | |||
25 | The new AES encryption added on Zip format by Winzip (see the page | ||
26 | http://www.winzip.com/aes_info.htm ) and PKWare PKZip 5.x Strong | ||
27 | Encryption is not supported. | ||
28 | */ | ||
29 | |||
30 | #define CRC32(c, b) ((*(pcrc_32_tab+(((int)(c) ^ (b)) & 0xff))) ^ ((c) >> 8)) | ||
31 | |||
32 | /*********************************************************************** | ||
33 | * Return the next byte in the pseudo-random sequence | ||
34 | */ | ||
35 | static int decrypt_byte(unsigned long* pkeys, const unsigned long* pcrc_32_tab) | ||
36 | { | ||
37 | (void) pcrc_32_tab; /* avoid "unused parameter" warning */ | ||
38 | unsigned temp; /* POTENTIAL BUG: temp*(temp^1) may overflow in an | ||
39 | * unpredictable manner on 16-bit systems; not a problem | ||
40 | * with any known compiler so far, though */ | ||
41 | |||
42 | temp = ((unsigned)(*(pkeys+2)) & 0xffff) | 2; | ||
43 | return (int)(((temp * (temp ^ 1)) >> 8) & 0xff); | ||
44 | } | ||
45 | |||
46 | /*********************************************************************** | ||
47 | * Update the encryption keys with the next byte of plain text | ||
48 | */ | ||
49 | static int update_keys(unsigned long* pkeys,const unsigned long* pcrc_32_tab,int c) | ||
50 | { | ||
51 | (*(pkeys+0)) = CRC32((*(pkeys+0)), c); | ||
52 | (*(pkeys+1)) += (*(pkeys+0)) & 0xff; | ||
53 | (*(pkeys+1)) = (*(pkeys+1)) * 134775813L + 1; | ||
54 | { | ||
55 | register int keyshift = (int)((*(pkeys+1)) >> 24); | ||
56 | (*(pkeys+2)) = CRC32((*(pkeys+2)), keyshift); | ||
57 | } | ||
58 | return c; | ||
59 | } | ||
60 | |||
61 | |||
62 | /*********************************************************************** | ||
63 | * Initialize the encryption keys and the random header according to | ||
64 | * the given password. | ||
65 | */ | ||
66 | static void init_keys(const char* passwd,unsigned long* pkeys,const unsigned long* pcrc_32_tab) | ||
67 | { | ||
68 | *(pkeys+0) = 305419896L; | ||
69 | *(pkeys+1) = 591751049L; | ||
70 | *(pkeys+2) = 878082192L; | ||
71 | while (*passwd != '\0') { | ||
72 | update_keys(pkeys,pcrc_32_tab,(int)*passwd); | ||
73 | passwd++; | ||
74 | } | ||
75 | } | ||
76 | |||
77 | #define zdecode(pkeys,pcrc_32_tab,c) \ | ||
78 | (update_keys(pkeys,pcrc_32_tab,c ^= decrypt_byte(pkeys,pcrc_32_tab))) | ||
79 | |||
80 | #define zencode(pkeys,pcrc_32_tab,c,t) \ | ||
81 | (t=decrypt_byte(pkeys,pcrc_32_tab), update_keys(pkeys,pcrc_32_tab,c), t^(c)) | ||
82 | |||
83 | #ifdef INCLUDECRYPTINGCODE_IFCRYPTALLOWED | ||
84 | |||
85 | #define RAND_HEAD_LEN 12 | ||
86 | /* "last resort" source for second part of crypt seed pattern */ | ||
87 | # ifndef ZCR_SEED2 | ||
88 | # define ZCR_SEED2 3141592654UL /* use PI as default pattern */ | ||
89 | # endif | ||
90 | |||
91 | static int crypthead(passwd, buf, bufSize, pkeys, pcrc_32_tab, crcForCrypting) | ||
92 | const char *passwd; /* password string */ | ||
93 | unsigned char *buf; /* where to write header */ | ||
94 | int bufSize; | ||
95 | unsigned long* pkeys; | ||
96 | const unsigned long* pcrc_32_tab; | ||
97 | unsigned long crcForCrypting; | ||
98 | { | ||
99 | int n; /* index in random header */ | ||
100 | int t; /* temporary */ | ||
101 | int c; /* random byte */ | ||
102 | unsigned char header[RAND_HEAD_LEN-2]; /* random header */ | ||
103 | static unsigned calls = 0; /* ensure different random header each time */ | ||
104 | |||
105 | if (bufSize<RAND_HEAD_LEN) | ||
106 | return 0; | ||
107 | |||
108 | /* First generate RAND_HEAD_LEN-2 random bytes. We encrypt the | ||
109 | * output of rand() to get less predictability, since rand() is | ||
110 | * often poorly implemented. | ||
111 | */ | ||
112 | if (++calls == 1) | ||
113 | { | ||
114 | srand((unsigned)(time(NULL) ^ ZCR_SEED2)); | ||
115 | } | ||
116 | init_keys(passwd, pkeys, pcrc_32_tab); | ||
117 | for (n = 0; n < RAND_HEAD_LEN-2; n++) | ||
118 | { | ||
119 | c = (rand() >> 7) & 0xff; | ||
120 | header[n] = (unsigned char)zencode(pkeys, pcrc_32_tab, c, t); | ||
121 | } | ||
122 | /* Encrypt random header (last two bytes is high word of crc) */ | ||
123 | init_keys(passwd, pkeys, pcrc_32_tab); | ||
124 | for (n = 0; n < RAND_HEAD_LEN-2; n++) | ||
125 | { | ||
126 | buf[n] = (unsigned char)zencode(pkeys, pcrc_32_tab, header[n], t); | ||
127 | } | ||
128 | buf[n++] = zencode(pkeys, pcrc_32_tab, (int)(crcForCrypting >> 16) & 0xff, t); | ||
129 | buf[n++] = zencode(pkeys, pcrc_32_tab, (int)(crcForCrypting >> 24) & 0xff, t); | ||
130 | return n; | ||
131 | } | ||
132 | |||
133 | #endif | ||