64 lines
1.9 KiB
C
64 lines
1.9 KiB
C
/* crypt.h -- base code for traditional PKWARE encryption
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Version 1.01e, February 12th, 2005
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Copyright (C) 1998-2005 Gilles Vollant
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Modifications for Info-ZIP crypting
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Copyright (C) 2003 Terry Thorsen
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This code is a modified version of crypting code in Info-ZIP distribution
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Copyright (C) 1990-2000 Info-ZIP. All rights reserved.
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This program is distributed under the terms of the same license as zlib.
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See the accompanying LICENSE file for the full text of the license.
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*/
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#ifndef _MINICRYPT_H
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#define _MINICRYPT_H
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#if ZLIB_VERNUM < 0x1270
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#if !defined(Z_U4)
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typedef unsigned long z_crc_t;
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#endif
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define RAND_HEAD_LEN 12
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/***************************************************************************/
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#define zdecode(pkeys,pcrc_32_tab,c) \
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(update_keys(pkeys,pcrc_32_tab, c ^= decrypt_byte(pkeys)))
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#define zencode(pkeys,pcrc_32_tab,c,t) \
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(t = decrypt_byte(pkeys), update_keys(pkeys,pcrc_32_tab,c), t^(c))
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/***************************************************************************/
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/* Return the next byte in the pseudo-random sequence */
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uint8_t decrypt_byte(uint32_t *pkeys);
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/* Update the encryption keys with the next byte of plain text */
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uint8_t update_keys(uint32_t *pkeys, const z_crc_t *pcrc_32_tab, int32_t c);
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/* Initialize the encryption keys and the random header according to the given password. */
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void init_keys(const char *passwd, uint32_t *pkeys, const z_crc_t *pcrc_32_tab);
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/* Generate cryptographically secure random numbers */
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int cryptrand(unsigned char *buf, unsigned int len);
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/* Create encryption header */
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int crypthead(const char *passwd, uint8_t *buf, int buf_size, uint32_t *pkeys,
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const z_crc_t *pcrc_32_tab, uint8_t verify1, uint8_t verify2);
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/***************************************************************************/
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#ifdef __cplusplus
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}
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#endif
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#endif
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