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appledoc now embeds the default templates, installing them on demand only! The CLI is completely self contained
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/* crypt.h -- base code for crypt/uncrypt ZIPfile | ||
Version 1.01e, February 12th, 2005 | ||
Copyright (C) 1998-2005 Gilles Vollant | ||
This code is a modified version of crypting code in Infozip distribution | ||
The encryption/decryption parts of this source code (as opposed to the | ||
non-echoing password parts) were originally written in Europe. The | ||
whole source package can be freely distributed, including from the USA. | ||
(Prior to January 2000, re-export from the US was a violation of US law.) | ||
This encryption code is a direct transcription of the algorithm from | ||
Roger Schlafly, described by Phil Katz in the file appnote.txt. This | ||
file (appnote.txt) is distributed with the PKZIP program (even in the | ||
version without encryption capabilities). | ||
If you don't need crypting in your application, just define symbols | ||
NOCRYPT and NOUNCRYPT. | ||
This code support the "Traditional PKWARE Encryption". | ||
The new AES encryption added on Zip format by Winzip (see the page | ||
http://www.winzip.com/aes_info.htm ) and PKWare PKZip 5.x Strong | ||
Encryption is not supported. | ||
*/ | ||
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#define CRC32(c, b) ((*(pcrc_32_tab+(((int)(c) ^ (b)) & 0xff))) ^ ((c) >> 8)) | ||
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/*********************************************************************** | ||
* Return the next byte in the pseudo-random sequence | ||
*/ | ||
static int decrypt_byte(unsigned long* pkeys, const unsigned long* pcrc_32_tab) | ||
{ | ||
unsigned temp; /* POTENTIAL BUG: temp*(temp^1) may overflow in an | ||
* unpredictable manner on 16-bit systems; not a problem | ||
* with any known compiler so far, though */ | ||
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temp = ((unsigned)(*(pkeys+2)) & 0xffff) | 2; | ||
return (int)(((temp * (temp ^ 1)) >> 8) & 0xff); | ||
} | ||
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/*********************************************************************** | ||
* Update the encryption keys with the next byte of plain text | ||
*/ | ||
static int update_keys(unsigned long* pkeys,const unsigned long* pcrc_32_tab,int c) | ||
{ | ||
(*(pkeys+0)) = CRC32((*(pkeys+0)), c); | ||
(*(pkeys+1)) += (*(pkeys+0)) & 0xff; | ||
(*(pkeys+1)) = (*(pkeys+1)) * 134775813L + 1; | ||
{ | ||
register int keyshift = (int)((*(pkeys+1)) >> 24); | ||
(*(pkeys+2)) = CRC32((*(pkeys+2)), keyshift); | ||
} | ||
return c; | ||
} | ||
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/*********************************************************************** | ||
* Initialize the encryption keys and the random header according to | ||
* the given password. | ||
*/ | ||
static void init_keys(const char* passwd,unsigned long* pkeys,const unsigned long* pcrc_32_tab) | ||
{ | ||
*(pkeys+0) = 305419896L; | ||
*(pkeys+1) = 591751049L; | ||
*(pkeys+2) = 878082192L; | ||
while (*passwd != '\0') { | ||
update_keys(pkeys,pcrc_32_tab,(int)*passwd); | ||
passwd++; | ||
} | ||
} | ||
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#define zdecode(pkeys,pcrc_32_tab,c) \ | ||
(update_keys(pkeys,pcrc_32_tab,c ^= decrypt_byte(pkeys,pcrc_32_tab))) | ||
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#define zencode(pkeys,pcrc_32_tab,c,t) \ | ||
(t=decrypt_byte(pkeys,pcrc_32_tab), update_keys(pkeys,pcrc_32_tab,c), t^(c)) | ||
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#ifdef INCLUDECRYPTINGCODE_IFCRYPTALLOWED | ||
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#define RAND_HEAD_LEN 12 | ||
/* "last resort" source for second part of crypt seed pattern */ | ||
# ifndef ZCR_SEED2 | ||
# define ZCR_SEED2 3141592654UL /* use PI as default pattern */ | ||
# endif | ||
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static int crypthead(passwd, buf, bufSize, pkeys, pcrc_32_tab, crcForCrypting) | ||
const char *passwd; /* password string */ | ||
unsigned char *buf; /* where to write header */ | ||
int bufSize; | ||
unsigned long* pkeys; | ||
const unsigned long* pcrc_32_tab; | ||
unsigned long crcForCrypting; | ||
{ | ||
int n; /* index in random header */ | ||
int t; /* temporary */ | ||
int c; /* random byte */ | ||
unsigned char header[RAND_HEAD_LEN-2]; /* random header */ | ||
static unsigned calls = 0; /* ensure different random header each time */ | ||
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if (bufSize<RAND_HEAD_LEN) | ||
return 0; | ||
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/* First generate RAND_HEAD_LEN-2 random bytes. We encrypt the | ||
* output of rand() to get less predictability, since rand() is | ||
* often poorly implemented. | ||
*/ | ||
if (++calls == 1) | ||
{ | ||
srand((unsigned)(time(NULL) ^ ZCR_SEED2)); | ||
} | ||
init_keys(passwd, pkeys, pcrc_32_tab); | ||
for (n = 0; n < RAND_HEAD_LEN-2; n++) | ||
{ | ||
c = (rand() >> 7) & 0xff; | ||
header[n] = (unsigned char)zencode(pkeys, pcrc_32_tab, c, t); | ||
} | ||
/* Encrypt random header (last two bytes is high word of crc) */ | ||
init_keys(passwd, pkeys, pcrc_32_tab); | ||
for (n = 0; n < RAND_HEAD_LEN-2; n++) | ||
{ | ||
buf[n] = (unsigned char)zencode(pkeys, pcrc_32_tab, header[n], t); | ||
} | ||
buf[n++] = zencode(pkeys, pcrc_32_tab, (int)(crcForCrypting >> 16) & 0xff, t); | ||
buf[n++] = zencode(pkeys, pcrc_32_tab, (int)(crcForCrypting >> 24) & 0xff, t); | ||
return n; | ||
} | ||
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#endif |
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