| |
| /* |
| * Copyright 2004,2005 The Apache Software Foundation. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| /* 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. |
| */ |
| |
| #define CRC32(c, b) ((*(pcrc_32_tab+(((int)(c) ^ (b)) & 0xff))) ^ ((c) >> 8)) |
| |
| /*********************************************************************** |
| * Return the next byte in the pseudo-random sequence |
| */ |
| int decrypt_byte( |
| unsigned long *pkeys, |
| const unsigned long *pcrc_32_tab); |
| |
| /*********************************************************************** |
| * Update the encryption keys with the next byte of plain text |
| */ |
| int update_keys( |
| unsigned long *pkeys, |
| const unsigned long *pcrc_32_tab, |
| int c); |
| |
| /*********************************************************************** |
| * Initialize the encryption keys and the random header according to |
| * the given password. |
| */ |
| void init_keys( |
| const char *passwd, |
| unsigned long *pkeys, |
| const unsigned long *pcrc_32_tab); |
| |
| #define zdecode(pkeys,pcrc_32_tab,c) \ |
| (update_keys(pkeys,pcrc_32_tab,c ^= decrypt_byte(pkeys,pcrc_32_tab))) |
| |
| #define zencode(pkeys,pcrc_32_tab,c,t) \ |
| (t=decrypt_byte(pkeys,pcrc_32_tab), update_keys(pkeys,pcrc_32_tab,c), t^(c)) |
| |
| #ifdef INCLUDECRYPTINGCODE_IFCRYPTALLOWED |
| |
| #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 |
| |
| int crypthead( |
| passwd, |
| buf, |
| bufSize, |
| pkeys, |
| pcrc_32_tab, |
| crcForCrypting); |
| |
| #endif |