diff options
Diffstat (limited to 'contrib/minizip/crypt.h')
-rw-r--r-- | contrib/minizip/crypt.h | 264 |
1 files changed, 132 insertions, 132 deletions
diff --git a/contrib/minizip/crypt.h b/contrib/minizip/crypt.h index f14a628..622f4bc 100644 --- a/contrib/minizip/crypt.h +++ b/contrib/minizip/crypt.h | |||
@@ -1,132 +1,132 @@ | |||
1 | /* crypt.h -- base code for crypt/uncrypt ZIPfile | 1 | /* crypt.h -- base code for crypt/uncrypt ZIPfile |
2 | 2 | ||
3 | 3 | ||
4 | Version 1.01e, February 12th, 2005 | 4 | Version 1.01e, February 12th, 2005 |
5 | 5 | ||
6 | Copyright (C) 1998-2005 Gilles Vollant | 6 | Copyright (C) 1998-2005 Gilles Vollant |
7 | 7 | ||
8 | This code is a modified version of crypting code in Infozip distribution | 8 | This code is a modified version of crypting code in Infozip distribution |
9 | 9 | ||
10 | The encryption/decryption parts of this source code (as opposed to the | 10 | The encryption/decryption parts of this source code (as opposed to the |
11 | non-echoing password parts) were originally written in Europe. The | 11 | non-echoing password parts) were originally written in Europe. The |
12 | whole source package can be freely distributed, including from the USA. | 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.) | 13 | (Prior to January 2000, re-export from the US was a violation of US law.) |
14 | 14 | ||
15 | This encryption code is a direct transcription of the algorithm from | 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 | 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 | 17 | file (appnote.txt) is distributed with the PKZIP program (even in the |
18 | version without encryption capabilities). | 18 | version without encryption capabilities). |
19 | 19 | ||
20 | If you don't need crypting in your application, just define symbols | 20 | If you don't need crypting in your application, just define symbols |
21 | NOCRYPT and NOUNCRYPT. | 21 | NOCRYPT and NOUNCRYPT. |
22 | 22 | ||
23 | This code support the "Traditional PKWARE Encryption". | 23 | This code support the "Traditional PKWARE Encryption". |
24 | 24 | ||
25 | The new AES encryption added on Zip format by Winzip (see the page | 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 | 26 | http://www.winzip.com/aes_info.htm ) and PKWare PKZip 5.x Strong |
27 | Encryption is not supported. | 27 | Encryption is not supported. |
28 | */ | 28 | */ |
29 | 29 | ||
30 | #define CRC32(c, b) ((*(pcrc_32_tab+(((int)(c) ^ (b)) & 0xff))) ^ ((c) >> 8)) | 30 | #define CRC32(c, b) ((*(pcrc_32_tab+(((int)(c) ^ (b)) & 0xff))) ^ ((c) >> 8)) |
31 | 31 | ||
32 | /*********************************************************************** | 32 | /*********************************************************************** |
33 | * Return the next byte in the pseudo-random sequence | 33 | * Return the next byte in the pseudo-random sequence |
34 | */ | 34 | */ |
35 | static int decrypt_byte(unsigned long* pkeys, const unsigned long* pcrc_32_tab) | 35 | static int decrypt_byte(unsigned long* pkeys, const unsigned long* pcrc_32_tab) |
36 | { | 36 | { |
37 | unsigned temp; /* POTENTIAL BUG: temp*(temp^1) may overflow in an | 37 | unsigned temp; /* POTENTIAL BUG: temp*(temp^1) may overflow in an |
38 | * unpredictable manner on 16-bit systems; not a problem | 38 | * unpredictable manner on 16-bit systems; not a problem |
39 | * with any known compiler so far, though */ | 39 | * with any known compiler so far, though */ |
40 | 40 | ||
41 | temp = ((unsigned)(*(pkeys+2)) & 0xffff) | 2; | 41 | temp = ((unsigned)(*(pkeys+2)) & 0xffff) | 2; |
42 | return (int)(((temp * (temp ^ 1)) >> 8) & 0xff); | 42 | return (int)(((temp * (temp ^ 1)) >> 8) & 0xff); |
43 | } | 43 | } |
44 | 44 | ||
45 | /*********************************************************************** | 45 | /*********************************************************************** |
46 | * Update the encryption keys with the next byte of plain text | 46 | * Update the encryption keys with the next byte of plain text |
47 | */ | 47 | */ |
48 | static int update_keys(unsigned long* pkeys,const unsigned long* pcrc_32_tab,int c) | 48 | static int update_keys(unsigned long* pkeys,const unsigned long* pcrc_32_tab,int c) |
49 | { | 49 | { |
50 | (*(pkeys+0)) = CRC32((*(pkeys+0)), c); | 50 | (*(pkeys+0)) = CRC32((*(pkeys+0)), c); |
51 | (*(pkeys+1)) += (*(pkeys+0)) & 0xff; | 51 | (*(pkeys+1)) += (*(pkeys+0)) & 0xff; |
52 | (*(pkeys+1)) = (*(pkeys+1)) * 134775813L + 1; | 52 | (*(pkeys+1)) = (*(pkeys+1)) * 134775813L + 1; |
53 | { | 53 | { |
54 | register int keyshift = (int)((*(pkeys+1)) >> 24); | 54 | register int keyshift = (int)((*(pkeys+1)) >> 24); |
55 | (*(pkeys+2)) = CRC32((*(pkeys+2)), keyshift); | 55 | (*(pkeys+2)) = CRC32((*(pkeys+2)), keyshift); |
56 | } | 56 | } |
57 | return c; | 57 | return c; |
58 | } | 58 | } |
59 | 59 | ||
60 | 60 | ||
61 | /*********************************************************************** | 61 | /*********************************************************************** |
62 | * Initialize the encryption keys and the random header according to | 62 | * Initialize the encryption keys and the random header according to |
63 | * the given password. | 63 | * the given password. |
64 | */ | 64 | */ |
65 | static void init_keys(const char* passwd,unsigned long* pkeys,const unsigned long* pcrc_32_tab) | 65 | static void init_keys(const char* passwd,unsigned long* pkeys,const unsigned long* pcrc_32_tab) |
66 | { | 66 | { |
67 | *(pkeys+0) = 305419896L; | 67 | *(pkeys+0) = 305419896L; |
68 | *(pkeys+1) = 591751049L; | 68 | *(pkeys+1) = 591751049L; |
69 | *(pkeys+2) = 878082192L; | 69 | *(pkeys+2) = 878082192L; |
70 | while (*passwd != '\0') { | 70 | while (*passwd != '\0') { |
71 | update_keys(pkeys,pcrc_32_tab,(int)*passwd); | 71 | update_keys(pkeys,pcrc_32_tab,(int)*passwd); |
72 | passwd++; | 72 | passwd++; |
73 | } | 73 | } |
74 | } | 74 | } |
75 | 75 | ||
76 | #define zdecode(pkeys,pcrc_32_tab,c) \ | 76 | #define zdecode(pkeys,pcrc_32_tab,c) \ |
77 | (update_keys(pkeys,pcrc_32_tab,c ^= decrypt_byte(pkeys,pcrc_32_tab))) | 77 | (update_keys(pkeys,pcrc_32_tab,c ^= decrypt_byte(pkeys,pcrc_32_tab))) |
78 | 78 | ||
79 | #define zencode(pkeys,pcrc_32_tab,c,t) \ | 79 | #define zencode(pkeys,pcrc_32_tab,c,t) \ |
80 | (t=decrypt_byte(pkeys,pcrc_32_tab), update_keys(pkeys,pcrc_32_tab,c), t^(c)) | 80 | (t=decrypt_byte(pkeys,pcrc_32_tab), update_keys(pkeys,pcrc_32_tab,c), t^(c)) |
81 | 81 | ||
82 | #ifdef INCLUDECRYPTINGCODE_IFCRYPTALLOWED | 82 | #ifdef INCLUDECRYPTINGCODE_IFCRYPTALLOWED |
83 | 83 | ||
84 | #define RAND_HEAD_LEN 12 | 84 | #define RAND_HEAD_LEN 12 |
85 | /* "last resort" source for second part of crypt seed pattern */ | 85 | /* "last resort" source for second part of crypt seed pattern */ |
86 | # ifndef ZCR_SEED2 | 86 | # ifndef ZCR_SEED2 |
87 | # define ZCR_SEED2 3141592654UL /* use PI as default pattern */ | 87 | # define ZCR_SEED2 3141592654UL /* use PI as default pattern */ |
88 | # endif | 88 | # endif |
89 | 89 | ||
90 | static int crypthead(passwd, buf, bufSize, pkeys, pcrc_32_tab, crcForCrypting) | 90 | static int crypthead(passwd, buf, bufSize, pkeys, pcrc_32_tab, crcForCrypting) |
91 | const char *passwd; /* password string */ | 91 | const char *passwd; /* password string */ |
92 | unsigned char *buf; /* where to write header */ | 92 | unsigned char *buf; /* where to write header */ |
93 | int bufSize; | 93 | int bufSize; |
94 | unsigned long* pkeys; | 94 | unsigned long* pkeys; |
95 | const unsigned long* pcrc_32_tab; | 95 | const unsigned long* pcrc_32_tab; |
96 | unsigned long crcForCrypting; | 96 | unsigned long crcForCrypting; |
97 | { | 97 | { |
98 | int n; /* index in random header */ | 98 | int n; /* index in random header */ |
99 | int t; /* temporary */ | 99 | int t; /* temporary */ |
100 | int c; /* random byte */ | 100 | int c; /* random byte */ |
101 | unsigned char header[RAND_HEAD_LEN-2]; /* random header */ | 101 | unsigned char header[RAND_HEAD_LEN-2]; /* random header */ |
102 | static unsigned calls = 0; /* ensure different random header each time */ | 102 | static unsigned calls = 0; /* ensure different random header each time */ |
103 | 103 | ||
104 | if (bufSize<RAND_HEAD_LEN) | 104 | if (bufSize<RAND_HEAD_LEN) |
105 | return 0; | 105 | return 0; |
106 | 106 | ||
107 | /* First generate RAND_HEAD_LEN-2 random bytes. We encrypt the | 107 | /* First generate RAND_HEAD_LEN-2 random bytes. We encrypt the |
108 | * output of rand() to get less predictability, since rand() is | 108 | * output of rand() to get less predictability, since rand() is |
109 | * often poorly implemented. | 109 | * often poorly implemented. |
110 | */ | 110 | */ |
111 | if (++calls == 1) | 111 | if (++calls == 1) |
112 | { | 112 | { |
113 | srand((unsigned)(time(NULL) ^ ZCR_SEED2)); | 113 | srand((unsigned)(time(NULL) ^ ZCR_SEED2)); |
114 | } | 114 | } |
115 | init_keys(passwd, pkeys, pcrc_32_tab); | 115 | init_keys(passwd, pkeys, pcrc_32_tab); |
116 | for (n = 0; n < RAND_HEAD_LEN-2; n++) | 116 | for (n = 0; n < RAND_HEAD_LEN-2; n++) |
117 | { | 117 | { |
118 | c = (rand() >> 7) & 0xff; | 118 | c = (rand() >> 7) & 0xff; |
119 | header[n] = (unsigned char)zencode(pkeys, pcrc_32_tab, c, t); | 119 | header[n] = (unsigned char)zencode(pkeys, pcrc_32_tab, c, t); |
120 | } | 120 | } |
121 | /* Encrypt random header (last two bytes is high word of crc) */ | 121 | /* Encrypt random header (last two bytes is high word of crc) */ |
122 | init_keys(passwd, pkeys, pcrc_32_tab); | 122 | init_keys(passwd, pkeys, pcrc_32_tab); |
123 | for (n = 0; n < RAND_HEAD_LEN-2; n++) | 123 | for (n = 0; n < RAND_HEAD_LEN-2; n++) |
124 | { | 124 | { |
125 | buf[n] = (unsigned char)zencode(pkeys, pcrc_32_tab, header[n], t); | 125 | buf[n] = (unsigned char)zencode(pkeys, pcrc_32_tab, header[n], t); |
126 | } | 126 | } |
127 | buf[n++] = zencode(pkeys, pcrc_32_tab, (int)(crcForCrypting >> 16) & 0xff, t); | 127 | buf[n++] = zencode(pkeys, pcrc_32_tab, (int)(crcForCrypting >> 16) & 0xff, t); |
128 | buf[n++] = zencode(pkeys, pcrc_32_tab, (int)(crcForCrypting >> 24) & 0xff, t); | 128 | buf[n++] = zencode(pkeys, pcrc_32_tab, (int)(crcForCrypting >> 24) & 0xff, t); |
129 | return n; | 129 | return n; |
130 | } | 130 | } |
131 | 131 | ||
132 | #endif | 132 | #endif |