crypt.h

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/* crypt.h -- base code for traditional PKWARE encryption
   Version 1.2.0, September 16th, 2017
 
   Copyright (C) 2012-2017 Nathan Moinvaziri
     https://github.com/nmoinvaz/minizip
   Copyright (C) 1998-2005 Gilles Vollant
     Modifications for Info-ZIP crypting
     http://www.winimage.com/zLibDll/minizip.html
   Copyright (C) 2003 Terry Thorsen
 
   This code is a modified version of crypting code in Info-ZIP distribution
 
   Copyright (C) 1990-2000 Info-ZIP.  All rights reserved.
 
   This program is distributed under the terms of the same license as zlib.
   See the accompanying LICENSE file for the full text of the license.
*/
 
#ifndef _MINICRYPT_H
#define _MINICRYPT_H
 
#if ZLIB_VERNUM < 0x1270
typedef unsigned long z_crc_t;
#endif
 
#ifdef __cplusplus
extern "C" {
#endif
 
#define RAND_HEAD_LEN  12
 
/***************************************************************************/
 
#define zdecode(pkeys,pcrc_32_tab,c) \
    (update_keys(pkeys,pcrc_32_tab, c ^= decrypt_byte(pkeys)))
 
#define zencode(pkeys,pcrc_32_tab,c,t) \
    (t = decrypt_byte(pkeys), update_keys(pkeys,pcrc_32_tab,c), t^(c))
 
/***************************************************************************/
 
/* Return the next byte in the pseudo-random sequence */
uint8_t decrypt_byte(uint32_t *pkeys);
 
/* Update the encryption keys with the next byte of plain text */
uint8_t update_keys(uint32_t *pkeys, const z_crc_t *pcrc_32_tab, int32_t c);
 
/* Initialize the encryption keys and the random header according to the given password. */
void init_keys(const char *passwd, uint32_t *pkeys, const z_crc_t *pcrc_32_tab);
 
#ifndef NOCRYPT
/* Generate cryptographically secure random numbers */
int cryptrand(unsigned char *buf, unsigned int len);
 
/* Create encryption header */
int crypthead(const char *passwd, uint8_t *buf, int buf_size, uint32_t *pkeys,
    const z_crc_t *pcrc_32_tab, uint8_t verify1, uint8_t verify2);
#endif
 
/***************************************************************************/
 
#ifdef __cplusplus
}
#endif
 
#endif