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Diffstat (limited to 'libs/assimp/contrib/unzip/crypt.c')
| -rw-r--r-- | libs/assimp/contrib/unzip/crypt.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/libs/assimp/contrib/unzip/crypt.c b/libs/assimp/contrib/unzip/crypt.c new file mode 100644 index 0000000..299ce03 --- /dev/null +++ b/libs/assimp/contrib/unzip/crypt.c @@ -0,0 +1,171 @@ +/* crypt.c -- base code for traditional PKWARE encryption + Version 1.01e, February 12th, 2005 + + Copyright (C) 1998-2005 Gilles Vollant + Modifications for Info-ZIP crypting + 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. + + 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. +*/ + +#if defined(WIN32) || defined(_WIN32) || defined(__WIN32) && !defined(__CYGWIN__) + #define MICROSOFT_WINDOWS_WINBASE_H_DEFINE_INTERLOCKED_CPLUSPLUS_OVERLOADS 0 +#endif + +#include <stdio.h> +#include <stdlib.h> +#include <stdint.h> +#include <time.h> + +#ifdef _WIN32 +# include <windows.h> +# include <wincrypt.h> +#else +# include <sys/stat.h> +# include <fcntl.h> +# include <unistd.h> +#endif + +#include "zlib.h" + +#include "crypt.h" + +#ifdef _WIN32 +# pragma warning(push) +# pragma warning(disable : 4244) +#endif // _WIN32 + +/***************************************************************************/ + +#define CRC32(c, b) ((*(pcrc_32_tab+(((uint32_t)(c) ^ (b)) & 0xff))) ^ ((c) >> 8)) + +#ifndef ZCR_SEED2 +# define ZCR_SEED2 3141592654UL /* use PI as default pattern */ +#endif + +/***************************************************************************/ + +uint8_t decrypt_byte(uint32_t *pkeys) +{ + unsigned temp; /* POTENTIAL BUG: temp*(temp^1) may overflow in an + * unpredictable manner on 16-bit systems; not a problem + * with any known compiler so far, though */ + + temp = ((uint32_t)(*(pkeys+2)) & 0xffff) | 2; + return (uint8_t)(((temp * (temp ^ 1)) >> 8) & 0xff); +} + +uint8_t update_keys(uint32_t *pkeys, const z_crc_t *pcrc_32_tab, int32_t c) +{ + (*(pkeys+0)) = (uint32_t)CRC32((*(pkeys+0)), c); + (*(pkeys+1)) += (*(pkeys+0)) & 0xff; + (*(pkeys+1)) = (*(pkeys+1)) * 134775813L + 1; + { + register int32_t keyshift = (int32_t)((*(pkeys + 1)) >> 24); + (*(pkeys+2)) = (uint32_t)CRC32((*(pkeys+2)), keyshift); + } + return c; +} + +void init_keys(const char *passwd, uint32_t *pkeys, const z_crc_t *pcrc_32_tab) +{ + *(pkeys+0) = 305419896L; + *(pkeys+1) = 591751049L; + *(pkeys+2) = 878082192L; + while (*passwd != 0) + { + update_keys(pkeys, pcrc_32_tab, *passwd); + passwd += 1; + } +} + +/***************************************************************************/ + +int cryptrand(unsigned char *buf, unsigned int len) +{ + static unsigned calls = 0; + int rlen = 0; +#ifdef _WIN32 + HCRYPTPROV provider; + unsigned __int64 pentium_tsc[1]; + int result = 0; + + + if (CryptAcquireContext(&provider, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT | CRYPT_SILENT)) + { + result = CryptGenRandom(provider, len, buf); + CryptReleaseContext(provider, 0); + if (result) + return len; + } + + for (rlen = 0; rlen < (int)len; ++rlen) + { + if (rlen % 8 == 0) + QueryPerformanceCounter((LARGE_INTEGER *)pentium_tsc); + buf[rlen] = ((unsigned char*)pentium_tsc)[rlen % 8]; + } +#else + int frand = open("/dev/urandom", O_RDONLY); + if (frand != -1) + { + rlen = (int)read(frand, buf, len); + close(frand); + } +#endif + if (rlen < (int)len) + { + /* Ensure different random header each time */ + if (++calls == 1) + srand((unsigned)(time(NULL) ^ ZCR_SEED2)); + + while (rlen < (int)len) + buf[rlen++] = (rand() >> 7) & 0xff; + } + return rlen; +} + +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) +{ + uint8_t n = 0; /* index in random header */ + uint8_t header[RAND_HEAD_LEN-2]; /* random header */ + uint16_t t = 0; /* temporary */ + + if (buf_size < RAND_HEAD_LEN) + return 0; + + init_keys(passwd, pkeys, pcrc_32_tab); + + /* First generate RAND_HEAD_LEN-2 random bytes. */ + cryptrand(header, RAND_HEAD_LEN-2); + + /* Encrypt random header (last two bytes is high word of crc) */ + init_keys(passwd, pkeys, pcrc_32_tab); + + for (n = 0; n < RAND_HEAD_LEN-2; n++) + buf[n] = (uint8_t)zencode(pkeys, pcrc_32_tab, header[n], t); + + buf[n++] = (uint8_t)zencode(pkeys, pcrc_32_tab, verify1, t); + buf[n++] = (uint8_t)zencode(pkeys, pcrc_32_tab, verify2, t); + return n; +} + +#ifdef _WIN32 +# pragma warning(pop) +#endif // _WIN32 + +/***************************************************************************/ |