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87 lines
3.9 KiB
C
87 lines
3.9 KiB
C
#ifndef _SQEX_SEAD_STREAMFILE_H_
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#define _SQEX_SEAD_STREAMFILE_H_
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#include "../streamfile.h"
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static STREAMFILE* setup_sqex_sead_streamfile(STREAMFILE *streamFile, off_t subfile_offset, size_t subfile_size, int encryption, size_t header_size, size_t key_start);
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typedef struct {
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size_t header_size;
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size_t key_start;
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} sqex_sead_decryption_data;
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static size_t sqex_sead_decryption_read(STREAMFILE *streamfile, uint8_t *dest, off_t offset, size_t length, sqex_sead_decryption_data* data) {
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/* Found in FFXII_TZA.exe (same key in SCD Ogg V3) */
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static const uint8_t encryption_key[0x100] = {
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0x3A,0x32,0x32,0x32,0x03,0x7E,0x12,0xF7,0xB2,0xE2,0xA2,0x67,0x32,0x32,0x22,0x32, // 00-0F
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0x32,0x52,0x16,0x1B,0x3C,0xA1,0x54,0x7B,0x1B,0x97,0xA6,0x93,0x1A,0x4B,0xAA,0xA6, // 10-1F
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0x7A,0x7B,0x1B,0x97,0xA6,0xF7,0x02,0xBB,0xAA,0xA6,0xBB,0xF7,0x2A,0x51,0xBE,0x03, // 20-2F
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0xF4,0x2A,0x51,0xBE,0x03,0xF4,0x2A,0x51,0xBE,0x12,0x06,0x56,0x27,0x32,0x32,0x36, // 30-3F
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0x32,0xB2,0x1A,0x3B,0xBC,0x91,0xD4,0x7B,0x58,0xFC,0x0B,0x55,0x2A,0x15,0xBC,0x40, // 40-4F
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0x92,0x0B,0x5B,0x7C,0x0A,0x95,0x12,0x35,0xB8,0x63,0xD2,0x0B,0x3B,0xF0,0xC7,0x14, // 50-5F
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0x51,0x5C,0x94,0x86,0x94,0x59,0x5C,0xFC,0x1B,0x17,0x3A,0x3F,0x6B,0x37,0x32,0x32, // 60-6F
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0x30,0x32,0x72,0x7A,0x13,0xB7,0x26,0x60,0x7A,0x13,0xB7,0x26,0x50,0xBA,0x13,0xB4, // 70-7F
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0x2A,0x50,0xBA,0x13,0xB5,0x2E,0x40,0xFA,0x13,0x95,0xAE,0x40,0x38,0x18,0x9A,0x92, // 80-8F
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0xB0,0x38,0x00,0xFA,0x12,0xB1,0x7E,0x00,0xDB,0x96,0xA1,0x7C,0x08,0xDB,0x9A,0x91, // 90-9F
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0xBC,0x08,0xD8,0x1A,0x86,0xE2,0x70,0x39,0x1F,0x86,0xE0,0x78,0x7E,0x03,0xE7,0x64, // A0-AF
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0x51,0x9C,0x8F,0x34,0x6F,0x4E,0x41,0xFC,0x0B,0xD5,0xAE,0x41,0xFC,0x0B,0xD5,0xAE, // B0-BF
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0x41,0xFC,0x3B,0x70,0x71,0x64,0x33,0x32,0x12,0x32,0x32,0x36,0x70,0x34,0x2B,0x56, // C0-CF
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0x22,0x70,0x3A,0x13,0xB7,0x26,0x60,0xBA,0x1B,0x94,0xAA,0x40,0x38,0x00,0xFA,0xB2, // D0-DF
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0xE2,0xA2,0x67,0x32,0x32,0x12,0x32,0xB2,0x32,0x32,0x32,0x32,0x75,0xA3,0x26,0x7B, // E0-EF
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0x83,0x26,0xF9,0x83,0x2E,0xFF,0xE3,0x16,0x7D,0xC0,0x1E,0x63,0x21,0x07,0xE3,0x01, // F0-FF
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};
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size_t bytes_read;
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off_t encrypted_offset = data->header_size;
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int i;
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bytes_read = streamfile->read(streamfile, dest, offset, length);
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/* decrypt data (xor) */
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if (offset >= encrypted_offset) {
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for (i = 0; i < bytes_read; i++) {
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dest[i] ^= encryption_key[(data->key_start + (offset - encrypted_offset) + i) % 0x100];
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}
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}
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return bytes_read;
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}
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/* decrypts subfile if neccessary */
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static STREAMFILE* setup_sqex_sead_streamfile(STREAMFILE *streamFile, off_t subfile_offset, size_t subfile_size, int encryption, size_t header_size, size_t key_start) {
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STREAMFILE *temp_streamFile = NULL, *new_streamFile = NULL;
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/* setup subfile */
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new_streamFile = open_wrap_streamfile(streamFile);
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if (!new_streamFile) goto fail;
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temp_streamFile = new_streamFile;
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new_streamFile = open_clamp_streamfile(temp_streamFile, subfile_offset,subfile_size);
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if (!new_streamFile) goto fail;
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temp_streamFile = new_streamFile;
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if (encryption) {
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sqex_sead_decryption_data io_data = {0};
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size_t io_data_size = sizeof(sqex_sead_decryption_data);
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io_data.header_size = header_size;
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io_data.key_start = key_start;
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new_streamFile = open_io_streamfile(temp_streamFile, &io_data,io_data_size, sqex_sead_decryption_read,NULL);
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if (!new_streamFile) goto fail;
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temp_streamFile = new_streamFile;
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}
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new_streamFile = open_fakename_streamfile(temp_streamFile, NULL,"hca");
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if (!new_streamFile) goto fail;
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temp_streamFile = new_streamFile;
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return temp_streamFile;
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fail:
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close_streamfile(temp_streamFile);
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return NULL;
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}
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#endif /* _SQEX_SEAD_STREAMFILE_H_ */
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