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Add SCD OGG v3 decryption (FF XIV Heavensward)

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Original code by ShadowRoze and algorithm by Ioncannon.
This commit is contained in:
bnnm 2017-01-03 19:03:08 +01:00
parent 119f24a5be
commit 8913ccdd47
4 changed files with 109 additions and 26 deletions
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9
src/meta/meta.h
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@ -102,9 +102,12 @@ typedef struct {
meta_t meta_type;
layout_t layout_type;
// XOR setup with a single byte (SCD)
unsigned char scd_xor;
off_t scd_xor_len;
/* XOR setup (SCD) */
int decryption_enabled;
void (*decryption_callback)(void *ptr, size_t size, size_t nmemb, void *datasource, int bytes_read);
uint8_t scd_xor;
off_t scd_xor_length;
} vgm_vorbis_info_t;
VGMSTREAM * init_vgmstream_ogg_vorbis_callbacks(STREAMFILE *streamFile, const char * filename, ov_callbacks *callbacks, off_t other_header_bytes, const vgm_vorbis_info_t *vgm_inf);

25
src/meta/ogg_vorbis_file.c
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@ -92,14 +92,9 @@ static size_t read_func_scd(void *ptr, size_t size, size_t nmemb, void * datasou
items_read = bytes_read / size;
/* first bytes are xor'd with a constant byte */
if (ov_streamfile->offset < ov_streamfile->scd_xor_len) {
int num_crypt = ov_streamfile->scd_xor_len-ov_streamfile->offset;
int i;
if (num_crypt > bytes_read) num_crypt=bytes_read;
for (i=0;i<num_crypt;i++)
((uint8_t*)ptr)[i] ^= ov_streamfile->scd_xor;
/* may be encrypted */
if (ov_streamfile->decryption_enabled) {
ov_streamfile->decryption_callback(ptr, size, nmemb, ov_streamfile, bytes_read);
}
ov_streamfile->offset += items_read * size;
@ -281,7 +276,7 @@ VGMSTREAM * init_vgmstream_ogg_vorbis_callbacks(STREAMFILE *streamFile, const ch
default_callbacks.close_func = close_func;
default_callbacks.tell_func = tell_func;
if (vgm_inf->scd_xor != 0) {
if (vgm_inf->decryption_enabled) {
default_callbacks.read_func = read_func_scd;
}
@ -292,8 +287,10 @@ VGMSTREAM * init_vgmstream_ogg_vorbis_callbacks(STREAMFILE *streamFile, const ch
temp_streamfile.offset = 0;
temp_streamfile.size = get_streamfile_size(temp_streamfile.streamfile);
temp_streamfile.other_header_bytes = other_header_bytes;
temp_streamfile.scd_xor = vgm_inf->scd_xor;
temp_streamfile.scd_xor_len = vgm_inf->scd_xor_len;
temp_streamfile.decryption_enabled = vgm_inf->decryption_enabled;
temp_streamfile.decryption_callback = vgm_inf->decryption_callback;
temp_streamfile.scd_xor = vgm_inf->scd_xor;
temp_streamfile.scd_xor_length = vgm_inf->scd_xor_length;
/* can we open this as a proper ogg vorbis file? */
memset(&temp_ovf, 0, sizeof(temp_ovf));
@ -314,8 +311,10 @@ VGMSTREAM * init_vgmstream_ogg_vorbis_callbacks(STREAMFILE *streamFile, const ch
data->ov_streamfile.offset = 0;
data->ov_streamfile.size = get_streamfile_size(data->ov_streamfile.streamfile);
data->ov_streamfile.other_header_bytes = other_header_bytes;
data->ov_streamfile.scd_xor = vgm_inf->scd_xor;
data->ov_streamfile.scd_xor_len = vgm_inf->scd_xor_len;
data->ov_streamfile.decryption_enabled = vgm_inf->decryption_enabled;
data->ov_streamfile.decryption_callback = vgm_inf->decryption_callback;
data->ov_streamfile.scd_xor = vgm_inf->scd_xor;
data->ov_streamfile.scd_xor_length = vgm_inf->scd_xor_length;
/* open the ogg vorbis file for real */
if (ov_open_callbacks(&data->ov_streamfile, &data->ogg_vorbis_file, NULL,

92
src/meta/sqex_scd.c
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@ -20,10 +20,36 @@ typedef struct _SCDINTSTREAMFILE
static STREAMFILE *open_scdint_with_STREAMFILE(STREAMFILE *file, const char * filename, off_t start_offset, off_t interleave_block_size, off_t stride_size, size_t total_size);
/* V3 decryption table found in the .exe */
static const uint8_t scd_ogg_v3_lookuptable[256] = { /* FF XIV Heavensward */
0x3A, 0x32, 0x32, 0x32, 0x03, 0x7E, 0x12, 0xF7, 0xB2, 0xE2, 0xA2, 0x67, 0x32, 0x32, 0x22, 0x32, // 00-0F
0x32, 0x52, 0x16, 0x1B, 0x3C, 0xA1, 0x54, 0x7B, 0x1B, 0x97, 0xA6, 0x93, 0x1A, 0x4B, 0xAA, 0xA6, // 10-1F
0x7A, 0x7B, 0x1B, 0x97, 0xA6, 0xF7, 0x02, 0xBB, 0xAA, 0xA6, 0xBB, 0xF7, 0x2A, 0x51, 0xBE, 0x03, // 20-2F
0xF4, 0x2A, 0x51, 0xBE, 0x03, 0xF4, 0x2A, 0x51, 0xBE, 0x12, 0x06, 0x56, 0x27, 0x32, 0x32, 0x36, // 30-3F
0x32, 0xB2, 0x1A, 0x3B, 0xBC, 0x91, 0xD4, 0x7B, 0x58, 0xFC, 0x0B, 0x55, 0x2A, 0x15, 0xBC, 0x40, // 40-4F
0x92, 0x0B, 0x5B, 0x7C, 0x0A, 0x95, 0x12, 0x35, 0xB8, 0x63, 0xD2, 0x0B, 0x3B, 0xF0, 0xC7, 0x14, // 50-5F
0x51, 0x5C, 0x94, 0x86, 0x94, 0x59, 0x5C, 0xFC, 0x1B, 0x17, 0x3A, 0x3F, 0x6B, 0x37, 0x32, 0x32, // 60-6F
0x30, 0x32, 0x72, 0x7A, 0x13, 0xB7, 0x26, 0x60, 0x7A, 0x13, 0xB7, 0x26, 0x50, 0xBA, 0x13, 0xB4, // 70-7F
0x2A, 0x50, 0xBA, 0x13, 0xB5, 0x2E, 0x40, 0xFA, 0x13, 0x95, 0xAE, 0x40, 0x38, 0x18, 0x9A, 0x92, // 80-8F
0xB0, 0x38, 0x00, 0xFA, 0x12, 0xB1, 0x7E, 0x00, 0xDB, 0x96, 0xA1, 0x7C, 0x08, 0xDB, 0x9A, 0x91, // 90-9F
0xBC, 0x08, 0xD8, 0x1A, 0x86, 0xE2, 0x70, 0x39, 0x1F, 0x86, 0xE0, 0x78, 0x7E, 0x03, 0xE7, 0x64, // A0-AF
0x51, 0x9C, 0x8F, 0x34, 0x6F, 0x4E, 0x41, 0xFC, 0x0B, 0xD5, 0xAE, 0x41, 0xFC, 0x0B, 0xD5, 0xAE, // B0-BF
0x41, 0xFC, 0x3B, 0x70, 0x71, 0x64, 0x33, 0x32, 0x12, 0x32, 0x32, 0x36, 0x70, 0x34, 0x2B, 0x56, // C0-CF
0x22, 0x70, 0x3A, 0x13, 0xB7, 0x26, 0x60, 0xBA, 0x1B, 0x94, 0xAA, 0x40, 0x38, 0x00, 0xFA, 0xB2, // D0-DF
0xE2, 0xA2, 0x67, 0x32, 0x32, 0x12, 0x32, 0xB2, 0x32, 0x32, 0x32, 0x32, 0x75, 0xA3, 0x26, 0x7B, // E0-EF
0x83, 0x26, 0xF9, 0x83, 0x2E, 0xFF, 0xE3, 0x16, 0x7D, 0xC0, 0x1E, 0x63, 0x21, 0x07, 0xE3, 0x01, // F0-FF
};
static void scd_ogg_decrypt_v2_callback(void *ptr, size_t size, size_t nmemb, void *datasource, int bytes_read);
static void scd_ogg_decrypt_v3_callback(void *ptr, size_t size, size_t nmemb, void *datasource, int bytes_read);
VGMSTREAM * init_vgmstream_sqex_scd(STREAMFILE *streamFile) {
VGMSTREAM * vgmstream = NULL;
char filename[PATH_LIMIT];
off_t start_offset, meta_offset_offset, meta_offset, post_meta_offset;
off_t start_offset, meta_offset_offset, meta_offset, post_meta_offset, data_size;
int32_t loop_start, loop_end;
int loop_flag = 0;
@ -52,7 +78,7 @@ VGMSTREAM * init_vgmstream_sqex_scd(STREAMFILE *streamFile) {
meta_offset_offset = 0x40 + read_16bit(0xe,streamFile);
} else if (read_32bitLE(8,streamFile) == 3 ||
read_32bitLE(8,streamFile) == 2) {
/* version 2/3 LE, as seen in FFXIV for ?? */
/* version 2/3 LE, as seen in FFXIV for PC (and others?) */
read_32bit = read_32bitLE;
read_16bit = read_16bitLE;
//size_offset = 0x10;
@ -67,6 +93,7 @@ VGMSTREAM * init_vgmstream_sqex_scd(STREAMFILE *streamFile) {
#endif
meta_offset = read_32bit(meta_offset_offset,streamFile);
data_size = read_32bit(meta_offset + 0x0, streamFile); /* music size */
/* check that chunk size equals stream size (?) */
loop_start = read_32bit(meta_offset+0x10,streamFile);
@ -130,18 +157,28 @@ VGMSTREAM * init_vgmstream_sqex_scd(STREAMFILE *streamFile) {
// failed with Ogg, try deobfuscating header
{
// skip chunks before xor_byte
unsigned char xor_byte;
xor_byte = read_8bit(post_meta_offset+2, streamFile);
uint8_t xor_version, xor_byte;
xor_version = read_8bit(post_meta_offset + 0, streamFile);
xor_byte = read_8bit(post_meta_offset + 2, streamFile);
if (xor_byte == 0) {
return NULL;
}
inf.scd_xor = xor_byte;
inf.scd_xor_len = vorb_header_size;
if (xor_version <= 2) {
inf.decryption_enabled = 1;
inf.decryption_callback = scd_ogg_decrypt_v2_callback;
inf.scd_xor = xor_byte;
inf.scd_xor_length = vorb_header_size; /* header is XOR'ed */
} else if (xor_version == 3) {
inf.decryption_enabled = 1;
inf.decryption_callback = scd_ogg_decrypt_v3_callback;
inf.scd_xor = data_size & 0xFF; /* xor_byte is not used? */
inf.scd_xor_length = data_size; /* full file is XOR'ed */
}
result = init_vgmstream_ogg_vorbis_callbacks(streamFile, filename, NULL, start_offset, &inf);
/* always? */
return result;
}
}
@ -307,6 +344,7 @@ VGMSTREAM * init_vgmstream_sqex_scd(STREAMFILE *streamFile) {
break;
#endif
default:
VGM_LOG("SCD unknown codec_id: %x\n", codec_id);
goto fail;
}
@ -460,3 +498,43 @@ static STREAMFILE *open_scdint_with_STREAMFILE(STREAMFILE *file, const char * fi
return &scd->sf;
}
static void scd_ogg_decrypt_v2_callback(void *ptr, size_t size, size_t nmemb, void *datasource, int bytes_read) {
ogg_vorbis_streamfile * ov_streamfile = (ogg_vorbis_streamfile*)datasource;
/* header is XOR'd with a constant byte */
if (ov_streamfile->offset < ov_streamfile->scd_xor_length) {
int i, num_crypt;
num_crypt = ov_streamfile->scd_xor_length - ov_streamfile->offset;
if (num_crypt > bytes_read)
num_crypt = bytes_read;
for (i = 0; i < num_crypt; i++) {
((uint8_t*)ptr)[i] ^= (uint8_t)ov_streamfile->scd_xor;
}
}
}
static void scd_ogg_decrypt_v3_callback(void *ptr, size_t size, size_t nmemb, void *datasource, int bytes_read) {
ogg_vorbis_streamfile *ov_streamfile = (ogg_vorbis_streamfile*)datasource;
/* file is XOR'd with a table (algorithm and table by Ioncannon) */
if (ov_streamfile->offset < ov_streamfile->scd_xor_length) {
int i, num_crypt;
uint8_t byte1, byte2, xorByte;
num_crypt = bytes_read;
byte1 = ov_streamfile->scd_xor & 0x7F;
byte2 = ov_streamfile->scd_xor & 0x3F;
for (i = 0; i < num_crypt; i++) {
xorByte = scd_ogg_v3_lookuptable[(byte2 + ov_streamfile->offset + i) & 0xFF];
xorByte &= 0xFF;
xorByte ^= ((uint8_t*)ptr)[i];
xorByte ^= byte1;
((uint8_t*)ptr)[i] = (uint8_t)xorByte;
}
}
}

9
src/vgmstream.h
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@ -739,9 +739,12 @@ typedef struct {
ogg_int64_t size;
ogg_int64_t other_header_bytes;
// XOR setup with a single byte (SCD)
unsigned char scd_xor;
ogg_int64_t scd_xor_len;
/* XOR setup (SCD) */
int decryption_enabled;
void (*decryption_callback)(void *ptr, size_t size, size_t nmemb, void *datasource, int bytes_read);
uint8_t scd_xor;
off_t scd_xor_length;
} ogg_vorbis_streamfile;
typedef struct {