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353 lines
10 KiB
353 lines
10 KiB
![]()
3 years ago
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/* mz_strm_pkcrypt.c -- Code for traditional PKWARE encryption
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Version 2.3.3, June 10, 2018
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part of the MiniZip project
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Copyright (C) 2010-2018 Nathan Moinvaziri
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https://github.com/nmoinvaz/minizip
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Copyright (C) 1998-2005 Gilles Vollant
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Modifications for Info-ZIP crypting
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http://www.winimage.com/zLibDll/minizip.html
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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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This encryption code is a direct transcription of the algorithm from
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Roger Schlafly, described by Phil Katz in the file appnote.txt. This
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file (appnote.txt) is distributed with the PKZIP program (even in the
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version without encryption capabilities).
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#ifdef HAVE_ZLIB
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#include "zlib.h"
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#endif
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#include "mz.h"
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#include "mz_os.h"
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#include "mz_strm.h"
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#ifdef HAVE_LZMA
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#include "mz_strm_lzma.h"
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#endif
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#include "mz_strm_pkcrypt.h"
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#ifdef HAVE_ZLIB
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#include "mz_strm_zlib.h"
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#endif
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/***************************************************************************/
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#define RAND_HEAD_LEN 12
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/***************************************************************************/
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static mz_stream_vtbl mz_stream_pkcrypt_vtbl = {
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mz_stream_pkcrypt_open,
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mz_stream_pkcrypt_is_open,
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mz_stream_pkcrypt_read,
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mz_stream_pkcrypt_write,
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mz_stream_pkcrypt_tell,
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mz_stream_pkcrypt_seek,
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mz_stream_pkcrypt_close,
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mz_stream_pkcrypt_error,
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mz_stream_pkcrypt_create,
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mz_stream_pkcrypt_delete,
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mz_stream_pkcrypt_get_prop_int64,
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NULL
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};
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/***************************************************************************/
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// Define z_crc_t in zlib 1.2.5 and less or if using zlib-ng
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#if (ZLIB_VERNUM < 0x1270) || defined(ZLIBNG_VERNUM) || !defined(HAVE_ZLIB)
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#ifdef HAVE_ZLIB
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typedef unsigned long z_crc_t;
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#else
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typedef uint32_t z_crc_t;
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#endif
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#endif
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/***************************************************************************/
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typedef struct mz_stream_pkcrypt_s {
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mz_stream stream;
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int32_t error;
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int16_t initialized;
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uint8_t buffer[INT16_MAX];
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int64_t total_in;
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int64_t total_out;
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uint32_t keys[3]; // keys defining the pseudo-random sequence
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const z_crc_t *crc_32_tab;
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uint8_t verify1;
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uint8_t verify2;
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const char *password;
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} mz_stream_pkcrypt;
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/***************************************************************************/
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#define zdecode(keys,crc_32_tab,c) \
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(mz_stream_pkcrypt_update_keys(keys,crc_32_tab, c ^= mz_stream_pkcrypt_decrypt_byte(keys)))
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#define zencode(keys,crc_32_tab,c,t) \
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(t = mz_stream_pkcrypt_decrypt_byte(keys), mz_stream_pkcrypt_update_keys(keys,crc_32_tab,c), t^(c))
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/***************************************************************************/
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static uint8_t mz_stream_pkcrypt_decrypt_byte(uint32_t *keys)
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{
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unsigned temp; /* POTENTIAL BUG: temp*(temp^1) may overflow in an
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* unpredictable manner on 16-bit systems; not a problem
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* with any known compiler so far, though */
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temp = ((uint32_t)(*(keys+2)) & 0xffff) | 2;
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return (uint8_t)(((temp * (temp ^ 1)) >> 8) & 0xff);
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}
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static uint8_t mz_stream_pkcrypt_update_keys(uint32_t *keys, const z_crc_t *crc_32_tab, int32_t c)
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{
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#define CRC32(c, b) ((*(crc_32_tab+(((uint32_t)(c) ^ (b)) & 0xff))) ^ ((c) >> 8))
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(*(keys+0)) = (uint32_t)CRC32((*(keys+0)), c);
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(*(keys+1)) += (*(keys+0)) & 0xff;
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(*(keys+1)) = (*(keys+1)) * 134775813L + 1;
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{
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register int32_t keyshift = (int32_t)((*(keys + 1)) >> 24);
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(*(keys+2)) = (uint32_t)CRC32((*(keys+2)), keyshift);
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}
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return (uint8_t)c;
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}
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static void mz_stream_pkcrypt_init_keys(const char *password, uint32_t *keys, const z_crc_t *crc_32_tab)
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{
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*(keys+0) = 305419896L;
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*(keys+1) = 591751049L;
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*(keys+2) = 878082192L;
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while (*password != 0)
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{
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mz_stream_pkcrypt_update_keys(keys, crc_32_tab, *password);
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password += 1;
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}
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}
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/***************************************************************************/
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int32_t mz_stream_pkcrypt_open(void *stream, const char *path, int32_t mode)
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{
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mz_stream_pkcrypt *pkcrypt = (mz_stream_pkcrypt *)stream;
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uint16_t t = 0;
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int16_t i = 0;
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//uint8_t verify1 = 0;
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uint8_t verify2 = 0;
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uint8_t header[RAND_HEAD_LEN];
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const char *password = path;
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pkcrypt->total_in = 0;
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pkcrypt->total_out = 0;
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pkcrypt->initialized = 0;
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if (mz_stream_is_open(pkcrypt->stream.base) != MZ_OK)
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return MZ_STREAM_ERROR;
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if (password == NULL)
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password = pkcrypt->password;
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if (password == NULL)
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return MZ_STREAM_ERROR;
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#ifdef HAVE_ZLIB
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pkcrypt->crc_32_tab = (z_crc_t *)mz_stream_zlib_get_crc32_table();
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#elif defined(HAVE_LZMA)
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pkcrypt->crc_32_tab = (z_crc_t *)mz_stream_lzma_get_crc32_table();
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#else
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#error ZLIB or LZMA required for CRC32
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#endif
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if (pkcrypt->crc_32_tab == NULL)
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return MZ_STREAM_ERROR;
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mz_stream_pkcrypt_init_keys(password, pkcrypt->keys, pkcrypt->crc_32_tab);
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if (mode & MZ_OPEN_MODE_WRITE)
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{
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// First generate RAND_HEAD_LEN - 2 random bytes.
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mz_os_rand(header, RAND_HEAD_LEN - 2);
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// Encrypt random header (last two bytes is high word of crc)
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for (i = 0; i < RAND_HEAD_LEN - 2; i++)
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header[i] = (uint8_t)zencode(pkcrypt->keys, pkcrypt->crc_32_tab, header[i], t);
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header[i++] = (uint8_t)zencode(pkcrypt->keys, pkcrypt->crc_32_tab, pkcrypt->verify1, t);
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header[i++] = (uint8_t)zencode(pkcrypt->keys, pkcrypt->crc_32_tab, pkcrypt->verify2, t);
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if (mz_stream_write(pkcrypt->stream.base, header, RAND_HEAD_LEN) != RAND_HEAD_LEN)
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return MZ_STREAM_ERROR;
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pkcrypt->total_out += RAND_HEAD_LEN;
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}
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else if (mode & MZ_OPEN_MODE_READ)
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{
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if (mz_stream_read(pkcrypt->stream.base, header, RAND_HEAD_LEN) != RAND_HEAD_LEN)
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return MZ_STREAM_ERROR;
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for (i = 0; i < RAND_HEAD_LEN - 2; i++)
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header[i] = (uint8_t)zdecode(pkcrypt->keys, pkcrypt->crc_32_tab, header[i]);
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//verify1 = (uint8_t)zdecode(crypt->keys, crypt->crc_32_tab, header[i++]);
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verify2 = (uint8_t)zdecode(pkcrypt->keys, pkcrypt->crc_32_tab, header[i++]);
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// Older versions used 2 byte check, newer versions use 1 byte check.
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if ((verify2 != 0) && (verify2 != pkcrypt->verify2))
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return MZ_PASSWORD_ERROR;
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pkcrypt->total_in += RAND_HEAD_LEN;
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}
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pkcrypt->initialized = 1;
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return MZ_OK;
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}
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int32_t mz_stream_pkcrypt_is_open(void *stream)
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{
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mz_stream_pkcrypt *pkcrypt = (mz_stream_pkcrypt *)stream;
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if (pkcrypt->initialized == 0)
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return MZ_STREAM_ERROR;
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return MZ_OK;
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}
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int32_t mz_stream_pkcrypt_read(void *stream, void *buf, int32_t size)
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{
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mz_stream_pkcrypt *pkcrypt = (mz_stream_pkcrypt *)stream;
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uint8_t *buf_ptr = (uint8_t *)buf;
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int32_t read = 0;
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int32_t i = 0;
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read = mz_stream_read(pkcrypt->stream.base, buf, size);
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for (i = 0; i < read; i++)
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buf_ptr[i] = (uint8_t)zdecode(pkcrypt->keys, pkcrypt->crc_32_tab, buf_ptr[i]);
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pkcrypt->total_in += read;
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return read;
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}
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int32_t mz_stream_pkcrypt_write(void *stream, const void *buf, int32_t size)
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{
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mz_stream_pkcrypt *pkcrypt = (mz_stream_pkcrypt *)stream;
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const uint8_t *buf_ptr = (const uint8_t *)buf;
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int32_t written = 0;
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int32_t i = 0;
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uint16_t t = 0;
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if (size > (int32_t)sizeof(pkcrypt->buffer))
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return MZ_STREAM_ERROR;
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for (i = 0; i < size; i++)
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pkcrypt->buffer[i] = (uint8_t)zencode(pkcrypt->keys, pkcrypt->crc_32_tab, buf_ptr[i], t);
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written = mz_stream_write(pkcrypt->stream.base, pkcrypt->buffer, size);
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if (written > 0)
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pkcrypt->total_out += written;
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return written;
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}
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int64_t mz_stream_pkcrypt_tell(void *stream)
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{
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mz_stream_pkcrypt *pkcrypt = (mz_stream_pkcrypt *)stream;
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return mz_stream_tell(pkcrypt->stream.base);
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}
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int32_t mz_stream_pkcrypt_seek(void *stream, int64_t offset, int32_t origin)
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{
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mz_stream_pkcrypt *pkcrypt = (mz_stream_pkcrypt *)stream;
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return mz_stream_seek(pkcrypt->stream.base, offset, origin);
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}
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int32_t mz_stream_pkcrypt_close(void *stream)
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{
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mz_stream_pkcrypt *pkcrypt = (mz_stream_pkcrypt *)stream;
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pkcrypt->initialized = 0;
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return MZ_OK;
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}
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int32_t mz_stream_pkcrypt_error(void *stream)
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{
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mz_stream_pkcrypt *pkcrypt = (mz_stream_pkcrypt *)stream;
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return pkcrypt->error;
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}
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void mz_stream_pkcrypt_set_password(void *stream, const char *password)
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{
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mz_stream_pkcrypt *pkcrypt = (mz_stream_pkcrypt *)stream;
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pkcrypt->password = password;
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}
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void mz_stream_pkcrypt_set_verify(void *stream, uint8_t verify1, uint8_t verify2)
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{
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mz_stream_pkcrypt *pkcrypt = (mz_stream_pkcrypt *)stream;
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pkcrypt->verify1 = verify1;
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pkcrypt->verify2 = verify2;
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}
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void mz_stream_pkcrypt_get_verify(void *stream, uint8_t *verify1, uint8_t *verify2)
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{
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mz_stream_pkcrypt *pkcrypt = (mz_stream_pkcrypt *)stream;
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*verify1 = pkcrypt->verify1;
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*verify2 = pkcrypt->verify2;
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}
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int32_t mz_stream_pkcrypt_get_prop_int64(void *stream, int32_t prop, int64_t *value)
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{
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mz_stream_pkcrypt *pkcrypt = (mz_stream_pkcrypt *)stream;
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switch (prop)
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{
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case MZ_STREAM_PROP_TOTAL_IN:
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*value = pkcrypt->total_in;
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return MZ_OK;
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case MZ_STREAM_PROP_TOTAL_OUT:
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*value = pkcrypt->total_out;
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return MZ_OK;
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}
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return MZ_EXIST_ERROR;
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}
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void *mz_stream_pkcrypt_create(void **stream)
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{
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mz_stream_pkcrypt *pkcrypt = NULL;
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pkcrypt = (mz_stream_pkcrypt *)MZ_ALLOC(sizeof(mz_stream_pkcrypt));
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if (pkcrypt != NULL)
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{
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memset(pkcrypt, 0, sizeof(mz_stream_pkcrypt));
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pkcrypt->stream.vtbl = &mz_stream_pkcrypt_vtbl;
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}
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if (stream != NULL)
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*stream = pkcrypt;
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return pkcrypt;
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}
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void mz_stream_pkcrypt_delete(void **stream)
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{
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mz_stream_pkcrypt *pkcrypt = NULL;
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if (stream == NULL)
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return;
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pkcrypt = (mz_stream_pkcrypt *)*stream;
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if (pkcrypt != NULL)
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MZ_FREE(pkcrypt);
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*stream = NULL;
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}
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void *mz_stream_pkcrypt_get_interface(void)
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{
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return (void *)&mz_stream_pkcrypt_vtbl;
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}
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