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author | Dominik Riebeling <Dominik.Riebeling@gmail.com> | 2021-12-15 21:04:28 +0100 |
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committer | Dominik Riebeling <Dominik.Riebeling@gmail.com> | 2021-12-24 18:05:53 +0100 |
commit | c876d3bbefe0dc00c27ca0c12d29da5874946962 (patch) | |
tree | 69f468a185a369b01998314bc3ecc19b70f4fcaa /utils/rbutilqt/quazip/minizip_crypt.h | |
parent | 6c6f0757d7a902feb293be165d1490c42bc8e7ad (diff) | |
download | rockbox-c876d3bbefe0dc00c27ca0c12d29da5874946962.tar.gz rockbox-c876d3bbefe0dc00c27ca0c12d29da5874946962.zip |
rbutil: Merge rbutil with utils folder.
rbutil uses several components from the utils folder, and can be
considered part of utils too. Having it in a separate folder is an
arbitrary split that doesn't help anymore these days, so merge them.
This also allows other utils to easily use libtools.make without the
need to navigate to a different folder.
Change-Id: I3fc2f4de19e3e776553efb5dea5f779dfec0dc21
Diffstat (limited to 'utils/rbutilqt/quazip/minizip_crypt.h')
-rw-r--r-- | utils/rbutilqt/quazip/minizip_crypt.h | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/utils/rbutilqt/quazip/minizip_crypt.h b/utils/rbutilqt/quazip/minizip_crypt.h new file mode 100644 index 0000000000..2e833f7f3c --- /dev/null +++ b/utils/rbutilqt/quazip/minizip_crypt.h | |||
@@ -0,0 +1,135 @@ | |||
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 | #include "quazip_global.h" | ||
31 | |||
32 | #define CRC32(c, b) ((*(pcrc_32_tab+(((int)(c) ^ (b)) & 0xff))) ^ ((c) >> 8)) | ||
33 | |||
34 | /*********************************************************************** | ||
35 | * Return the next byte in the pseudo-random sequence | ||
36 | */ | ||
37 | static int decrypt_byte(unsigned long* pkeys, const z_crc_t FAR * pcrc_32_tab QUAZIP_UNUSED) | ||
38 | { | ||
39 | //(void) pcrc_32_tab; /* avoid "unused parameter" warning */ | ||
40 | unsigned temp; /* POTENTIAL BUG: temp*(temp^1) may overflow in an | ||
41 | * unpredictable manner on 16-bit systems; not a problem | ||
42 | * with any known compiler so far, though */ | ||
43 | |||
44 | temp = ((unsigned)(*(pkeys+2)) & 0xffff) | 2; | ||
45 | return (int)(((temp * (temp ^ 1)) >> 8) & 0xff); | ||
46 | } | ||
47 | |||
48 | /*********************************************************************** | ||
49 | * Update the encryption keys with the next byte of plain text | ||
50 | */ | ||
51 | static int update_keys(unsigned long* pkeys,const z_crc_t FAR * pcrc_32_tab,int c) | ||
52 | { | ||
53 | (*(pkeys+0)) = CRC32((*(pkeys+0)), c); | ||
54 | (*(pkeys+1)) += (*(pkeys+0)) & 0xff; | ||
55 | (*(pkeys+1)) = (*(pkeys+1)) * 134775813L + 1; | ||
56 | { | ||
57 | register int keyshift = (int)((*(pkeys+1)) >> 24); | ||
58 | (*(pkeys+2)) = CRC32((*(pkeys+2)), keyshift); | ||
59 | } | ||
60 | return c; | ||
61 | } | ||
62 | |||
63 | |||
64 | /*********************************************************************** | ||
65 | * Initialize the encryption keys and the random header according to | ||
66 | * the given password. | ||
67 | */ | ||
68 | static void init_keys(const char* passwd,unsigned long* pkeys,const z_crc_t FAR * pcrc_32_tab) | ||
69 | { | ||
70 | *(pkeys+0) = 305419896L; | ||
71 | *(pkeys+1) = 591751049L; | ||
72 | *(pkeys+2) = 878082192L; | ||
73 | while (*passwd != '\0') { | ||
74 | update_keys(pkeys,pcrc_32_tab,(int)*passwd); | ||
75 | passwd++; | ||
76 | } | ||
77 | } | ||
78 | |||
79 | #define zdecode(pkeys,pcrc_32_tab,c) \ | ||
80 | (update_keys(pkeys,pcrc_32_tab,c ^= decrypt_byte(pkeys,pcrc_32_tab))) | ||
81 | |||
82 | #define zencode(pkeys,pcrc_32_tab,c,t) \ | ||
83 | (t=decrypt_byte(pkeys,pcrc_32_tab), update_keys(pkeys,pcrc_32_tab,c), t^(c)) | ||
84 | |||
85 | #ifdef INCLUDECRYPTINGCODE_IFCRYPTALLOWED | ||
86 | |||
87 | #define RAND_HEAD_LEN 12 | ||
88 | /* "last resort" source for second part of crypt seed pattern */ | ||
89 | # ifndef ZCR_SEED2 | ||
90 | # define ZCR_SEED2 3141592654UL /* use PI as default pattern */ | ||
91 | # endif | ||
92 | |||
93 | static int crypthead(passwd, buf, bufSize, pkeys, pcrc_32_tab, crcForCrypting) | ||
94 | const char *passwd; /* password string */ | ||
95 | unsigned char *buf; /* where to write header */ | ||
96 | int bufSize; | ||
97 | unsigned long* pkeys; | ||
98 | const z_crc_t FAR * pcrc_32_tab; | ||
99 | unsigned long crcForCrypting; | ||
100 | { | ||
101 | int n; /* index in random header */ | ||
102 | int t; /* temporary */ | ||
103 | int c; /* random byte */ | ||
104 | unsigned char header[RAND_HEAD_LEN-2]; /* random header */ | ||
105 | static unsigned calls = 0; /* ensure different random header each time */ | ||
106 | |||
107 | if (bufSize<RAND_HEAD_LEN) | ||
108 | return 0; | ||
109 | |||
110 | /* First generate RAND_HEAD_LEN-2 random bytes. We encrypt the | ||
111 | * output of rand() to get less predictability, since rand() is | ||
112 | * often poorly implemented. | ||
113 | */ | ||
114 | if (++calls == 1) | ||
115 | { | ||
116 | srand((unsigned)(time(NULL) ^ ZCR_SEED2)); | ||
117 | } | ||
118 | init_keys(passwd, pkeys, pcrc_32_tab); | ||
119 | for (n = 0; n < RAND_HEAD_LEN-2; n++) | ||
120 | { | ||
121 | c = (rand() >> 7) & 0xff; | ||
122 | header[n] = (unsigned char)zencode(pkeys, pcrc_32_tab, c, t); | ||
123 | } | ||
124 | /* Encrypt random header (last two bytes is high word of crc) */ | ||
125 | init_keys(passwd, pkeys, pcrc_32_tab); | ||
126 | for (n = 0; n < RAND_HEAD_LEN-2; n++) | ||
127 | { | ||
128 | buf[n] = (unsigned char)zencode(pkeys, pcrc_32_tab, header[n], t); | ||
129 | } | ||
130 | buf[n++] = zencode(pkeys, pcrc_32_tab, (int)(crcForCrypting >> 16) & 0xff, t); | ||
131 | buf[n++] = zencode(pkeys, pcrc_32_tab, (int)(crcForCrypting >> 24) & 0xff, t); | ||
132 | return n; | ||
133 | } | ||
134 | |||
135 | #endif | ||