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comparison Resources/ThirdParty/minizip/crypt.h @ 3284:e583bbf6ec6c

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upgraded minizip
author Sebastien Jodogne <s.jodogne@gmail.com>
date Thu, 21 Feb 2019 18:04:10 +0100
parents 8811abd6aec9
children
comparison
equal deleted inserted replaced
3283:997db5b2ad50 3284:e583bbf6ec6c
30 #define CRC32(c, b) ((*(pcrc_32_tab+(((int)(c) ^ (b)) & 0xff))) ^ ((c) >> 8)) 30 #define CRC32(c, b) ((*(pcrc_32_tab+(((int)(c) ^ (b)) & 0xff))) ^ ((c) >> 8))
31 31
32 /*********************************************************************** 32 /***********************************************************************
33 * Return the next byte in the pseudo-random sequence 33 * Return the next byte in the pseudo-random sequence
34 */ 34 */
35 static int decrypt_byte(unsigned long* pkeys, const unsigned long* pcrc_32_tab) 35 static int decrypt_byte(unsigned long* pkeys, const z_crc_t* pcrc_32_tab)
36 { 36 {
37 unsigned temp; /* POTENTIAL BUG: temp*(temp^1) may overflow in an 37 unsigned temp; /* POTENTIAL BUG: temp*(temp^1) may overflow in an
38 * unpredictable manner on 16-bit systems; not a problem 38 * unpredictable manner on 16-bit systems; not a problem
39 * with any known compiler so far, though */ 39 * with any known compiler so far, though */
40 40
43 } 43 }
44 44
45 /*********************************************************************** 45 /***********************************************************************
46 * Update the encryption keys with the next byte of plain text 46 * Update the encryption keys with the next byte of plain text
47 */ 47 */
48 static int update_keys(unsigned long* pkeys,const unsigned long* pcrc_32_tab,int c) 48 static int update_keys(unsigned long* pkeys,const z_crc_t* pcrc_32_tab,int c)
49 { 49 {
50 (*(pkeys+0)) = CRC32((*(pkeys+0)), c); 50 (*(pkeys+0)) = CRC32((*(pkeys+0)), c);
51 (*(pkeys+1)) += (*(pkeys+0)) & 0xff; 51 (*(pkeys+1)) += (*(pkeys+0)) & 0xff;
52 (*(pkeys+1)) = (*(pkeys+1)) * 134775813L + 1; 52 (*(pkeys+1)) = (*(pkeys+1)) * 134775813L + 1;
53 { 53 {
60 60
61 /*********************************************************************** 61 /***********************************************************************
62 * Initialize the encryption keys and the random header according to 62 * Initialize the encryption keys and the random header according to
63 * the given password. 63 * the given password.
64 */ 64 */
65 static void init_keys(const char* passwd,unsigned long* pkeys,const unsigned long* pcrc_32_tab) 65 static void init_keys(const char* passwd,unsigned long* pkeys,const z_crc_t* pcrc_32_tab)
66 { 66 {
67 *(pkeys+0) = 305419896L; 67 *(pkeys+0) = 305419896L;
68 *(pkeys+1) = 591751049L; 68 *(pkeys+1) = 591751049L;
69 *(pkeys+2) = 878082192L; 69 *(pkeys+2) = 878082192L;
70 while (*passwd != '\0') { 70 while (*passwd != '\0') {
89 89
90 static int crypthead(const char* passwd, /* password string */ 90 static int crypthead(const char* passwd, /* password string */
91 unsigned char* buf, /* where to write header */ 91 unsigned char* buf, /* where to write header */
92 int bufSize, 92 int bufSize,
93 unsigned long* pkeys, 93 unsigned long* pkeys,
94 const unsigned long* pcrc_32_tab, 94 const z_crc_t* pcrc_32_tab,
95 unsigned long crcForCrypting) 95 unsigned long crcForCrypting)
96 { 96 {
97 int n; /* index in random header */ 97 int n; /* index in random header */
98 int t; /* temporary */ 98 int t; /* temporary */
99 int c; /* random byte */ 99 int c; /* random byte */