30 #define CRC32(c, b) ((*(pcrc_32_tab+(((int)(c) ^ (b)) & 0xff))) ^ ((c) >> 8)) 35 static int decrypt_byte(
unsigned long* pkeys,
const z_crc_t* pcrc_32_tab)
41 temp = ((unsigned)(*(pkeys+2)) & 0xffff) | 2;
42 return (
int)(((temp * (temp ^ 1)) >> 8) & 0xff);
48 static int update_keys(
unsigned long* pkeys,
const z_crc_t* pcrc_32_tab,
int c)
50 (*(pkeys+0)) =
CRC32((*(pkeys+0)), c);
51 (*(pkeys+1)) += (*(pkeys+0)) & 0xff;
52 (*(pkeys+1)) = (*(pkeys+1)) * 134775813L + 1;
54 register int keyshift = (
int)((*(pkeys+1)) >> 24);
55 (*(pkeys+2)) =
CRC32((*(pkeys+2)), keyshift);
65 static void init_keys(
const char* passwd,
unsigned long* pkeys,
const z_crc_t* pcrc_32_tab)
67 *(pkeys+0) = 305419896L;
68 *(pkeys+1) = 591751049L;
69 *(pkeys+2) = 878082192L;
70 while (*passwd !=
'\0') {
71 update_keys(pkeys,pcrc_32_tab,(
int)*passwd);
76 #define zdecode(pkeys,pcrc_32_tab,c) \ 77 (update_keys(pkeys,pcrc_32_tab,c ^= decrypt_byte(pkeys,pcrc_32_tab))) 79 #define zencode(pkeys,pcrc_32_tab,c,t) \ 80 (t=decrypt_byte(pkeys,pcrc_32_tab), update_keys(pkeys,pcrc_32_tab,c), t^(c)) 82 #ifdef INCLUDECRYPTINGCODE_IFCRYPTALLOWED 84 #define RAND_HEAD_LEN 12 87 # define ZCR_SEED2 3141592654UL 90 static int crypthead(
const char* passwd,
95 unsigned long crcForCrypting)
100 unsigned char header[RAND_HEAD_LEN-2];
101 static unsigned calls = 0;
103 if (bufSize<RAND_HEAD_LEN)
112 srand((
unsigned)(time(
NULL) ^ ZCR_SEED2));
114 init_keys(passwd, pkeys, pcrc_32_tab);
115 for (n = 0; n < RAND_HEAD_LEN-2; n++)
117 c = (rand() >> 7) & 0xff;
118 header[
n] = (
unsigned char)
zencode(pkeys, pcrc_32_tab, c, t);
121 init_keys(passwd, pkeys, pcrc_32_tab);
122 for (n = 0; n < RAND_HEAD_LEN-2; n++)
124 buf[
n] = (
unsigned char)
zencode(pkeys, pcrc_32_tab, header[n], t);
126 buf[n++] = (
unsigned char)
zencode(pkeys, pcrc_32_tab, (
int)(crcForCrypting >> 16) & 0xff, t);
127 buf[n++] = (
unsigned char)
zencode(pkeys, pcrc_32_tab, (
int)(crcForCrypting >> 24) & 0xff, t);
GLenum GLuint GLenum GLsizei const GLchar * buf
#define zencode(pkeys, pcrc_32_tab, c, t)