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96 lines
2.1 KiB
C
96 lines
2.1 KiB
C
//
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// si/cic.c: PIF CIC security/lock out algorithms.
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//
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// CEN64: Cycle-Accurate Nintendo 64 Emulator.
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// Copyright (C) 2015, Tyler J. Stachecki.
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//
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// This file is subject to the terms and conditions defined in
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// 'LICENSE', which is part of this source code package.
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//
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#include "common.h"
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#include "si/cic.h"
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#define CIC_SEED_NUS_5101 0x0000AC00U
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#define CIC_SEED_NUS_6101 0x00063F3FU
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#define CIC_SEED_NUS_6102 0x00023F3FU
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#define CIC_SEED_NUS_6103 0x0002783FU
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#define CIC_SEED_NUS_6105 0x0002913FU
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#define CIC_SEED_NUS_6106 0x0002853FU
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#define CIC_SEED_NUS_8303 0x0000DD00U
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#define CRC_NUS_5101 0x587BD543U
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#define CRC_NUS_6101 0x6170A4A1U
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#define CRC_NUS_6102 0x90BB6CB5U
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#define CRC_NUS_6103 0x0B050EE0U
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#define CRC_NUS_6105 0x98BC2C86U
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#define CRC_NUS_6106 0xACC8580AU
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#define CRC_NUS_8303 0x0E018159U
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cen64_cold static uint32_t si_crc32(const uint8_t *data, size_t size);
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// Determines the CIC seed for a cart, given the ROM data.
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int get_cic_seed(const uint8_t *rom_data, uint32_t *cic_seed) {
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uint32_t crc = si_crc32(rom_data + 0x40, 0x1000 - 0x40);
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uint32_t aleck64crc = si_crc32(rom_data + 0x40, 0xC00 - 0x40);
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if (aleck64crc == CRC_NUS_5101) *cic_seed = CIC_SEED_NUS_5101;
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else switch (crc) {
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case CRC_NUS_6101:
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*cic_seed = CIC_SEED_NUS_6101;
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break;
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case CRC_NUS_6102:
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*cic_seed = CIC_SEED_NUS_6102;
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break;
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case CRC_NUS_6103:
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*cic_seed = CIC_SEED_NUS_6103;
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break;
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case CRC_NUS_6105:
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*cic_seed = CIC_SEED_NUS_6105;
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break;
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case CRC_NUS_6106:
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*cic_seed = CIC_SEED_NUS_6106;
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break;
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case CRC_NUS_8303:
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*cic_seed = CIC_SEED_NUS_8303;
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break;
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default:
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*cic_seed = 0;
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return 1;
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}
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return 0;
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}
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uint32_t si_crc32(const uint8_t *data, size_t size) {
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uint32_t table[256];
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unsigned n, k;
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uint32_t c;
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for (n = 0; n < 256; n++) {
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c = (uint32_t) n;
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for (k = 0; k < 8; k++) {
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if (c & 1)
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c = 0xEDB88320L ^ (c >> 1);
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else
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c = c >> 1;
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}
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table[n] = c;
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}
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c = 0L ^ 0xFFFFFFFF;
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for (n = 0; n < size; n++)
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c = table[(c ^ data[n]) & 0xFF] ^ (c >> 8);
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return c ^ 0xFFFFFFFF;
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}
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