86 lines
3.5 KiB
C++
86 lines
3.5 KiB
C++
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#include <cstring>
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#include "crypt.h"
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static uint16_t CRC_TABLE[256] = {
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0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5,
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0x60c6, 0x70e7, 0x8108, 0x9129, 0xa14a, 0xb16b,
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0xc18c, 0xd1ad, 0xe1ce, 0xf1ef, 0x1231, 0x0210,
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0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
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0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c,
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0xf3ff, 0xe3de, 0x2462, 0x3443, 0x0420, 0x1401,
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0x64e6, 0x74c7, 0x44a4, 0x5485, 0xa56a, 0xb54b,
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0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
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0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6,
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0x5695, 0x46b4, 0xb75b, 0xa77a, 0x9719, 0x8738,
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0xf7df, 0xe7fe, 0xd79d, 0xc7bc, 0x48c4, 0x58e5,
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0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
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0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969,
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0xa90a, 0xb92b, 0x5af5, 0x4ad4, 0x7ab7, 0x6a96,
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0x1a71, 0x0a50, 0x3a33, 0x2a12, 0xdbfd, 0xcbdc,
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0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
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0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03,
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0x0c60, 0x1c41, 0xedae, 0xfd8f, 0xcdec, 0xddcd,
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0xad2a, 0xbd0b, 0x8d68, 0x9d49, 0x7e97, 0x6eb6,
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0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
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0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a,
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0x9f59, 0x8f78, 0x9188, 0x81a9, 0xb1ca, 0xa1eb,
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0xd10c, 0xc12d, 0xf14e, 0xe16f, 0x1080, 0x00a1,
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0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
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0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c,
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0xe37f, 0xf35e, 0x02b1, 0x1290, 0x22f3, 0x32d2,
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0x4235, 0x5214, 0x6277, 0x7256, 0xb5ea, 0xa5cb,
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0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
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0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447,
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0x5424, 0x4405, 0xa7db, 0xb7fa, 0x8799, 0x97b8,
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0xe75f, 0xf77e, 0xc71d, 0xd73c, 0x26d3, 0x36f2,
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0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
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0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9,
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0xb98a, 0xa9ab, 0x5844, 0x4865, 0x7806, 0x6827,
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0x18c0, 0x08e1, 0x3882, 0x28a3, 0xcb7d, 0xdb5c,
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0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
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0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0,
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0x2ab3, 0x3a92, 0xfd2e, 0xed0f, 0xdd6c, 0xcd4d,
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0xbdaa, 0xad8b, 0x9de8, 0x8dc9, 0x7c26, 0x6c07,
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0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
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0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba,
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0x8fd9, 0x9ff8, 0x6e17, 0x7e36, 0x4e55, 0x5e74,
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0x2e93, 0x3eb2, 0x0ed1, 0x1ef0
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};
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Crypt::Crypt() {
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memset(this->keys, 0, sizeof(uint32_t) * 4);
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}
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void Crypt::set_keys(uint32_t reader_key, uint32_t game_key) {
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this->keys[0] = reader_key ^ 0x5491333;
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this->keys[1] = game_key ^ 0x1F123BB5;
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this->keys[2] = reader_key ^ 0x159A55E5;
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this->keys[3] = game_key ^ 0x75BCD15;
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}
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void Crypt::crypt(uint8_t *data, size_t len) {
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for (size_t i = 0; i < len; i++) {
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// shift keys
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int low = (int) i & 3;
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if (low == 0) {
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uint32_t key_new = (this->keys[3] << 11) ^ this->keys[3];
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this->keys[3] = this->keys[2];
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this->keys[2] = this->keys[1];
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this->keys[1] = this->keys[0];
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this->keys[0] = ((((this->keys[0] >> 11) ^ key_new) >> 8) ^ key_new ^ this->keys[0]);
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}
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// process data
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data[i] = (uint8_t) (this->keys[0] >> (((3 - low) << 3)) ^ data[i]);
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}
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}
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uint16_t Crypt::crc(const uint8_t *data, size_t len) {
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uint16_t crc = 0;
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for (size_t x = 0; x < len; x++) {
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crc = CRC_TABLE[data[x] ^ (uint8_t) (crc >> 8)] ^ (crc << 8);
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}
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return crc;
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}
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