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Diffstat (limited to 'crypt.h')
| -rw-r--r-- | crypt.h | 169 |
1 files changed, 169 insertions, 0 deletions
@@ -0,0 +1,169 @@ +/* + Copyright (c) 1990-2007 Info-ZIP. All rights reserved. + + See the accompanying file LICENSE, version 2007-Mar-4 or later + (the contents of which are also included in zip.h) for terms of use. + If, for some reason, all these files are missing, the Info-ZIP license + also may be found at: ftp://ftp.info-zip.org/pub/infozip/license.html +*/ +/* + crypt.h (full version) by Info-ZIP. Last revised: [see CR_VERSION_DATE] + + The main encryption/decryption source code for Info-Zip software was + originally written in Europe. To the best of our knowledge, it can + be freely distributed in both source and object forms from any country, + including the USA under License Exception TSU of the U.S. Export + Administration Regulations (section 740.13(e)) of 6 June 2002. + + NOTE on copyright history: + Previous versions of this source package (up to version 2.8) were + not copyrighted and put in the public domain. If you cannot comply + with the Info-Zip LICENSE, you may want to look for one of those + public domain versions. + */ + +#ifndef __crypt_h /* don't include more than once */ +#define __crypt_h + +#ifdef CRYPT +# undef CRYPT +#endif +/* + Logic of selecting "full crypt" code: + a) default behaviour: + - dummy crypt code when compiling UnZipSFX stub, to minimize size + - full crypt code when used to compile Zip, UnZip and fUnZip + b) USE_CRYPT defined: + - always full crypt code + c) NO_CRYPT defined: + - never full crypt code + NO_CRYPT takes precedence over USE_CRYPT + */ +#if defined(NO_CRYPT) +# define CRYPT 0 /* dummy version */ +#else +#if defined(USE_CRYPT) +# define CRYPT 1 /* full version */ +#else +#if !defined(SFX) +# define CRYPT 1 /* full version for zip and main unzip */ +#else +# define CRYPT 0 /* dummy version for unzip sfx */ +#endif +#endif /* ?USE_CRYPT */ +#endif /* ?NO_CRYPT */ + +#if CRYPT +/* full version */ + +#ifdef CR_BETA +# undef CR_BETA /* this is not a beta release */ +#endif + +#define CR_MAJORVER 2 +#define CR_MINORVER 91 +#ifdef CR_BETA +# define CR_BETA_VER "c BETA" +# define CR_VERSION_DATE "05 Jan 2007" /* last real code change */ +#else +# define CR_BETA_VER "" +# define CR_VERSION_DATE "05 Jan 2007" /* last public release date */ +# define CR_RELEASE +#endif + +#ifndef __G /* UnZip only, for now (DLL stuff) */ +# define __G +# define __G__ +# define __GDEF +# define __GPRO void +# define __GPRO__ +#endif + +#if defined(MSDOS) || defined(OS2) || defined(WIN32) +# ifndef DOS_OS2_W32 +# define DOS_OS2_W32 +# endif +#endif + +#if defined(DOS_OS2_W32) || defined(__human68k__) +# ifndef DOS_H68_OS2_W32 +# define DOS_H68_OS2_W32 +# endif +#endif + +#if defined(VM_CMS) || defined(MVS) +# ifndef CMS_MVS +# define CMS_MVS +# endif +#endif + +/* To allow combining of Zip and UnZip static libraries in a single binary, + * the Zip and UnZip versions of the crypt core functions have to be named + * differently. + */ +#ifdef ZIP +# ifdef REALLY_SHORT_SYMS +# define decrypt_byte zdcrby +# else +# define decrypt_byte zp_decrypt_byte +# endif +# define update_keys zp_update_keys +# define init_keys zp_init_keys +#else /* !ZIP */ +# ifdef REALLY_SHORT_SYMS +# define decrypt_byte dcrbyt +# endif +#endif /* ?ZIP */ + +#define IZ_PWLEN 80 /* input buffer size for reading encryption key */ +#ifndef PWLEN /* for compatibility with previous zcrypt release... */ +# define PWLEN IZ_PWLEN +#endif +#define RAND_HEAD_LEN 12 /* length of encryption random header */ + +/* the crc_32_tab array has to be provided externally for the crypt calculus */ + +/* encode byte c, using temp t. Warning: c must not have side effects. */ +#define zencode(c,t) (t=decrypt_byte(__G), update_keys(c), t^(c)) + +/* decode byte c in place */ +#define zdecode(c) update_keys(__G__ c ^= decrypt_byte(__G)) + +int decrypt_byte OF((__GPRO)); +int update_keys OF((__GPRO__ int c)); +void init_keys OF((__GPRO__ ZCONST char *passwd)); + +#ifdef ZIP + void crypthead OF((ZCONST char *, ulg)); +# ifdef UTIL + int zipcloak OF((struct zlist far *, ZCONST char *)); + int zipbare OF((struct zlist far *, ZCONST char *)); +# else + unsigned zfwrite OF((zvoid *, extent, extent)); + extern char *key; +# endif +#endif /* ZIP */ + +#if (defined(UNZIP) && !defined(FUNZIP)) + int decrypt OF((__GPRO__ ZCONST char *passwrd)); +#endif + +#ifdef FUNZIP + extern int encrypted; +# ifdef NEXTBYTE +# undef NEXTBYTE +# endif +# define NEXTBYTE \ + (encrypted? update_keys(__G__ getc(G.in)^decrypt_byte(__G)) : getc(G.in)) +#endif /* FUNZIP */ + +#else /* !CRYPT */ +/* dummy version */ + +#define zencode +#define zdecode + +#define zfwrite(b,s,c) bfwrite(b,s,c,BFWRITE_DATA) + +#endif /* ?CRYPT */ +#endif /* !__crypt_h */ |