179 lines
4.9 KiB
C
179 lines
4.9 KiB
C
/*
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Copyright (c) 1990-2000 Info-ZIP. All rights reserved.
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See the accompanying file LICENSE, version 2000-Apr-09 or later
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(the contents of which are also included in zip.h) for terms of use.
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If, for some reason, all these files are missing, the Info-ZIP license
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also may be found at: ftp://ftp.info-zip.org/pub/infozip/license.html
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*/
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/*
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crypt.h (full version) by Info-ZIP. Last revised: [see CR_VERSION_DATE]
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This encryption/decryption source code for Info-Zip software was
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originally written in Europe. The whole source package can be
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freely distributed, including from the USA. (Prior to January 2000,
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re-export from the US was a violation of US law.)
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NOTE on copyright history:
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Previous versions of this source package (up to version 2.8) were
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not copyrighted and put in the public domain. If you cannot comply
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with the Info-Zip LICENSE, you may want to look for one of those
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public domain versions.
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*/
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#ifndef __crypt_h /* don't include more than once */
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#define __crypt_h
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#ifdef CRYPT
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# undef CRYPT
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#endif
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/*
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Logic of selecting "full crypt" code:
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a) default behaviour:
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- dummy crypt code when used to compile Zip
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(because we do not distribute encrypting versions of Zip from US
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servers)
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- dummy crypt code when compiling UnZipSFX stub, to minimize size
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- full crypt code when used to compile UnZip and fUnZip
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b) USE_CRYPT defined:
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- always full crypt code
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c) NO_CRYPT defined:
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- never full crypt code
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NO_CRYPT takes precedence over USE_CRYPT
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*/
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#if defined(NO_CRYPT)
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# define CRYPT 0 /* dummy version */
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#else
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#if defined(USE_CRYPT)
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# define CRYPT 1 /* full version */
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#else
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#if (!defined(ZIP) && !defined(SFX))
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# define CRYPT 1 /* full version */
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#else
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# define CRYPT 0 /* dummy version */
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#endif
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#endif /* ?USE_CRYPT */
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#endif /* ?NO_CRYPT */
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#if CRYPT
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/* full version */
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#ifdef CR_BETA
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# undef CR_BETA /* this is not a beta release */
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#endif
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#define CR_MAJORVER 2
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#define CR_MINORVER 9
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#ifdef CR_BETA
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# define CR_BETA_VER "a BETA"
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# define CR_VERSION_DATE "05 May 2000" /* last real code change */
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#else
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# define CR_BETA_VER ""
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# define CR_VERSION_DATE "05 May 2000" /* last public release date */
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# define CR_RELEASE
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#endif
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#ifndef __G /* UnZip only, for now (DLL stuff) */
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# define __G
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# define __G__
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# define __GDEF
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# define __GPRO void
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# define __GPRO__
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#endif
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#if defined(MSDOS) || defined(OS2) || defined(WIN32)
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# ifndef DOS_OS2_W32
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# define DOS_OS2_W32
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# endif
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#endif
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#if defined(DOS_OS2_W32) || defined(__human68k__)
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# ifndef DOS_H68_OS2_W32
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# define DOS_H68_OS2_W32
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# endif
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#endif
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#if defined(VM_CMS) || defined(MVS)
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# ifndef CMS_MVS
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# define CMS_MVS
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# endif
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#endif
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/* To allow combining of Zip and UnZip static libraries in a single binary,
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* the Zip and UnZip versions of the crypt core functions have to be named
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* differently.
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*/
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#ifdef ZIP
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# ifdef REALLY_SHORT_SYMS
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# define decrypt_byte zdcrby
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# else
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# define decrypt_byte zp_decrypt_byte
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# endif
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# define update_keys zp_update_keys
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# define init_keys zp_init_keys
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#else /* !ZIP */
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# ifdef REALLY_SHORT_SYMS
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# define decrypt_byte dcrbyt
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# endif
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#endif /* ?ZIP */
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#define IZ_PWLEN 80 /* input buffer size for reading encryption key */
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#ifndef PWLEN /* for compatibility with previous zcrypt release... */
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# define PWLEN IZ_PWLEN
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#endif
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#define RAND_HEAD_LEN 12 /* length of encryption random header */
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/* the crc_32_tab array has to be provided externally for the crypt calculus */
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#ifndef CRC_32_TAB /* UnZip provides this in globals.h */
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# if (!defined(USE_ZLIB) || defined(USE_OWN_CRCTAB))
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extern ZCONST ulg near *crc_32_tab;
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# else
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extern ZCONST ulg Far *crc_32_tab;
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# endif
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#endif /* !CRC_32_TAB */
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/* encode byte c, using temp t. Warning: c must not have side effects. */
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#define zencode(c,t) (t=decrypt_byte(__G), update_keys(c), t^(c))
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/* decode byte c in place */
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#define zdecode(c) update_keys(__G__ c ^= decrypt_byte(__G))
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int decrypt_byte OF((__GPRO));
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int update_keys OF((__GPRO__ int c));
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void init_keys OF((__GPRO__ ZCONST char *passwd));
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#ifdef ZIP
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void crypthead OF((ZCONST char *, ulg, FILE *));
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# ifdef UTIL
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int zipcloak OF((struct zlist far *, FILE *, FILE *, ZCONST char *));
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int zipbare OF((struct zlist far *, FILE *, FILE *, ZCONST char *));
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# else
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unsigned zfwrite OF((zvoid *, extent, extent, FILE *));
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extern char *key;
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# endif
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#endif /* ZIP */
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#if (defined(UNZIP) && !defined(FUNZIP))
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int decrypt OF((__GPRO__ ZCONST char *passwrd));
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#endif
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#ifdef FUNZIP
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extern int encrypted;
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# ifdef NEXTBYTE
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# undef NEXTBYTE
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# endif
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# define NEXTBYTE \
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(encrypted? update_keys(__G__ getc(G.in)^decrypt_byte(__G)) : getc(G.in))
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#endif /* FUNZIP */
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#else /* !CRYPT */
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/* dummy version */
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#define zencode
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#define zdecode
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#define zfwrite fwrite
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#endif /* ?CRYPT */
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#endif /* !__crypt_h */
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