src/bin/unzip/crypt.h

   1 /*
   2   Copyright (c) 1990-2000 Info-ZIP.  All rights reserved.
   3
   4   See the accompanying file LICENSE, version 2000-Apr-09 or later
   5   (the contents of which are also included in zip.h) for terms of use.
   6   If, for some reason, all these files are missing, the Info-ZIP license
   7   also may be found at:  ftp://ftp.info-zip.org/pub/infozip/license.html
   8 */
   9 /*
  10   crypt.h (full version) by Info-ZIP.   Last revised:  [see CR_VERSION_DATE]
  11
  12   This encryption/decryption source code for Info-Zip software was
  13   originally written in Europe.  The whole source package can be
  14   freely distributed, including from the USA.  (Prior to January 2000,
  15   re-export from the US was a violation of US law.)
  16
  17   NOTE on copyright history:
  18   Previous versions of this source package (up to version 2.8) were
  19   not copyrighted and put in the public domain.  If you cannot comply
  20   with the Info-Zip LICENSE, you may want to look for one of those
  21   public domain versions.
  22  */
  23
  24 #ifndef __crypt_h   /* don't include more than once */
  25 #define __crypt_h
  26
  27 #ifdef CRYPT
  28 #  undef CRYPT
  29 #endif
  30 /*
  31    Logic of selecting "full crypt" code:
  32    a) default behaviour:
  33       - dummy crypt code when used to compile Zip
  34         (because we do not distribute encrypting versions of Zip from US
  35         servers)
  36       - dummy crypt code when compiling UnZipSFX stub, to minimize size
  37       - full crypt code when used to compile UnZip and fUnZip
  38    b) USE_CRYPT defined:
  39       - always full crypt code
  40    c) NO_CRYPT defined:
  41       - never full crypt code
  42    NO_CRYPT takes precedence over USE_CRYPT
  43  */
  44 #if defined(NO_CRYPT)
  45 #  define CRYPT  0  /* dummy version */
  46 #else
  47 #if defined(USE_CRYPT)
  48 #  define CRYPT  1  /* full version */
  49 #else
  50 #if (!defined(ZIP) && !defined(SFX))
  51 #  define CRYPT  1  /* full version */
  52 #else
  53 #  define CRYPT  0  /* dummy version */
  54 #endif
  55 #endif /* ?USE_CRYPT */
  56 #endif /* ?NO_CRYPT */
  57
  58 #if CRYPT
  59 /* full version */
  60
  61 #ifdef CR_BETA
  62 #  undef CR_BETA    /* this is not a beta release */
  63 #endif
  64
  65 #define CR_MAJORVER        2
  66 #define CR_MINORVER        9
  67 #ifdef CR_BETA
  68 #  define CR_BETA_VER      "a BETA"
  69 #  define CR_VERSION_DATE  "05 May 2000"       /* last real code change */
  70 #else
  71 #  define CR_BETA_VER      ""
  72 #  define CR_VERSION_DATE  "05 May 2000"       /* last public release date */
  73 #  define CR_RELEASE
  74 #endif
  75
  76 #ifndef __G         /* UnZip only, for now (DLL stuff) */
  77 #  define __G
  78 #  define __G__
  79 #  define __GDEF
  80 #  define __GPRO    void
  81 #  define __GPRO__
  82 #endif
  83
  84 #if defined(MSDOS) || defined(OS2) || defined(WIN32)
  85 #  ifndef DOS_OS2_W32
  86 #    define DOS_OS2_W32
  87 #  endif
  88 #endif
  89
  90 #if defined(DOS_OS2_W32) || defined(__human68k__)
  91 #  ifndef DOS_H68_OS2_W32
  92 #    define DOS_H68_OS2_W32
  93 #  endif
  94 #endif
  95
  96 #if defined(VM_CMS) || defined(MVS)
  97 #  ifndef CMS_MVS
  98 #    define CMS_MVS
  99 #  endif
 100 #endif
 101
 102 /* To allow combining of Zip and UnZip static libraries in a single binary,
 103  * the Zip and UnZip versions of the crypt core functions have to be named
 104  * differently.
 105  */
 106 #ifdef ZIP
 107 #  ifdef REALLY_SHORT_SYMS
 108 #    define decrypt_byte   zdcrby
 109 #  else
 110 #    define decrypt_byte   zp_decrypt_byte
 111 #  endif
 112 #  define  update_keys     zp_update_keys
 113 #  define  init_keys       zp_init_keys
 114 #else /* !ZIP */
 115 #  ifdef REALLY_SHORT_SYMS
 116 #    define decrypt_byte   dcrbyt
 117 #  endif
 118 #endif /* ?ZIP */
 119
 120 #define IZ_PWLEN  80    /* input buffer size for reading encryption key */
 121 #ifndef PWLEN           /* for compatibility with previous zcrypt release... */
 122 #  define PWLEN IZ_PWLEN
 123 #endif
 124 #define RAND_HEAD_LEN  12       /* length of encryption random header */
 125
 126 /* the crc_32_tab array has to be provided externally for the crypt calculus */
 127 #ifndef CRC_32_TAB                   /* UnZip provides this in globals.h */
 128 # if (!defined(USE_ZLIB) || defined(USE_OWN_CRCTAB))
 129    extern ZCONST ulg near *crc_32_tab;
 130 # else
 131    extern ZCONST ulg Far *crc_32_tab;
 132 # endif
 133 #endif /* !CRC_32_TAB */
 134
 135 /* encode byte c, using temp t.  Warning: c must not have side effects. */
 136 #define zencode(c,t)  (t=decrypt_byte(__G), update_keys(c), t^(c))
 137
 138 /* decode byte c in place */
 139 #define zdecode(c)   update_keys(__G__ c ^= decrypt_byte(__G))
 140
 141 int  decrypt_byte OF((__GPRO));
 142 int  update_keys OF((__GPRO__ int c));
 143 void init_keys OF((__GPRO__ ZCONST char *passwd));
 144
 145 #ifdef ZIP
 146    void crypthead OF((ZCONST char *, ulg, FILE *));
 147 #  ifdef UTIL
 148      int zipcloak OF((struct zlist far *, FILE *, FILE *, ZCONST char *));
 149      int zipbare OF((struct zlist far *, FILE *, FILE *, ZCONST char *));
 150 #  else
 151      unsigned zfwrite OF((zvoid *, extent, extent, FILE *));
 152      extern char *key;
 153 #  endif
 154 #endif /* ZIP */
 155
 156 #if (defined(UNZIP) && !defined(FUNZIP))
 157    int  decrypt OF((__GPRO__ ZCONST char *passwrd));
 158 #endif
 159
 160 #ifdef FUNZIP
 161    extern int encrypted;
 162 #  ifdef NEXTBYTE
 163 #    undef NEXTBYTE
 164 #  endif
 165 #  define NEXTBYTE \
 166    (encrypted? update_keys(__G__ getc(G.in)^decrypt_byte(__G)) : getc(G.in))
 167 #endif /* FUNZIP */
 168
 169 #else /* !CRYPT */
 170 /* dummy version */
 171
 172 #define zencode
 173 #define zdecode
 174
 175 #define zfwrite  fwrite
 176
 177 #endif /* ?CRYPT */
 178 #endif /* !__crypt_h */