ENCDEC Device Reverse Engineering: Difference between revisions

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[[Category:Software]]
=Introduction=
=Introduction=


* ENCDEC is the encoder/decoder, integrated inside [[South Bridge]]
* The following information was reverse engineered from LV1, Storage Manager in LPAR1, sb_iso_spu_module.self and sv_iso_spu_module.self.
* The following information was reverse engineered from LV1, Storage Manager in LPAR1, sb_iso_spu_module.self and sv_iso_spu_module.self.


Line 35: Line 35:
........ 00 00 00 00 00 00 00 01
........ 00 00 00 00 00 00 00 01
........ 00 00 00 00 03 00 01 03        <-------- SB bus id v2
........ 00 00 00 00 03 00 01 03        <-------- SB bus id v2
# Dumping it with ps3lv1call-tools
~/ps3lv1call-tools$ sudo ./ps3lv1call 91 1 0x0000000062757301 0x6964000000000000 0 0
0000000000000001 0000000004000103
</pre>
</pre>
* During the communication, host and ENCDEC device use random IVs which are sent unencrypted together with encrypted payload.
* During the communication, host and ENCDEC device use random IVs which are sent unencrypted together with encrypted payload.
Line 75: Line 80:
* Here the Linux application i use with my ps3encdec device driver to set/clear ATA/ENCDEC keys on my PS3.
* Here the Linux application i use with my ps3encdec device driver to set/clear ATA/ENCDEC keys on my PS3.


<pre>
See my GIT repo: http://gitorious.ps3dev.net/ps3linux/encdec
/*-
* Copyright (C) 2012 glevand <[email protected]>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer,
*    without modification, immediately at the beginning of the file.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
 
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <getopt.h>
#include <ctype.h>
 
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/select.h>
#include <fcntl.h>
#include <unistd.h>
 
#include <openssl/aes.h>
 
static struct option long_opts[] = {
{ "device", no_argument, NULL, 'd' },
{ "verbose", no_argument, NULL, 'v' },
{ "rnd1", no_argument, NULL, 'r' },
{ "rnd2", no_argument, NULL, 's' },
{ "rnd3", no_argument, NULL, 't' },
{ "key1", no_argument, NULL, 'k' },
{ "key2", no_argument, NULL, 'l' },
{ "magic", no_argument, NULL, 'm' },
{ "atakeyindex", no_argument, NULL, 'i' },
{ "atakey", no_argument, NULL, 'a' },
{ NULL, 0, NULL, 0 }
};
 
static const char *device = "/dev/ps3encdec";
static int verbose;
static unsigned char rnd1[AES_BLOCK_SIZE];
static unsigned char rnd2[2 * AES_BLOCK_SIZE];
static unsigned char rnd3[AES_BLOCK_SIZE];
static unsigned char key1[2 * AES_BLOCK_SIZE] = {
0xe3, 0xf2, 0x26, 0x65, 0xaf, 0xc4, 0xe1, 0xc0, 0x14, 0xa4, 0x31, 0x24, 0x1d, 0xbc, 0x0b, 0x69, 0xd5, 0xd6, 0x68, 0x57, 0xd9, 0x1e, 0x6b, 0x27,
};
static unsigned char key2[2 * AES_BLOCK_SIZE] = {
0x66, 0x86, 0x6a, 0xf7, 0x48, 0x9a, 0xe8, 0x5a, 0xbf, 0x98, 0xa6, 0x70, 0xaa, 0x27, 0x67, 0x2e, 0x06, 0x6e, 0x60, 0xd1, 0x4d, 0x52, 0x41, 0x21,
};
static unsigned char magic[2 * AES_BLOCK_SIZE] = {
0xeb, 0x97, 0x06, 0xb9, 0xa7, 0x5a, 0x48, 0x85, 0x3b, 0xd4, 0x03, 0x5a, 0xde, 0x93, 0x6e, 0x05, 0x0e, 0x87, 0xe7, 0x42, 0xd2, 0x7a, 0x86, 0x09,
};
static int atakeyindex = 1;
static unsigned char atakey[2 * AES_BLOCK_SIZE];
static int atakey_length;
 
static int
parse_hex(const char *s, unsigned char *b, int maxlen)
{
int len;
char c;
int i;
 
len = strlen(s);
if (len % 2)
return (-1);
 
for (i = 0; (i < (len / 2)) && (i < maxlen); i++) {
if (!isxdigit(s[2 * i + 0]) || !isxdigit(s[2 * i + 1]))
return (-1);
 
b[i] = 0;
 
c = tolower(s[2 * i + 0]);
if (isdigit(c))
b[i] += (c - '0') * 16;
else
b[i] += (c - 'a' + 10) * 16;
 
c = tolower(s[2 * i + 1]);
if (isdigit(c))
b[i] += c - '0';
else
b[i] += c - 'a' + 10;
}
 
return (i);
}
 
static int
parse_opts(int argc, char **argv)
{
int c;
char *endptr;
 
while ((c = getopt_long(argc, argv, "d:vr:s:k:t:l:m:i:a:", long_opts, NULL)) != -1) {
switch (c) {
case 'd':
device = optarg;
break;
case 'v':
verbose++;
break;
case 'r':
if (parse_hex(optarg, rnd1, AES_BLOCK_SIZE) != AES_BLOCK_SIZE) {
fprintf(stderr, "invalid rnd1 specified: %s\n", optarg);
return (-1);
}
break;
case 's':
if (parse_hex(optarg, rnd2, 2 * AES_BLOCK_SIZE) != 2 * AES_BLOCK_SIZE) {
fprintf(stderr, "invalid rnd2 specified: %s\n", optarg);
return (-1);
}
break;
case 't':
if (parse_hex(optarg, rnd3, AES_BLOCK_SIZE) != AES_BLOCK_SIZE) {
fprintf(stderr, "invalid rnd3 specified: %s\n", optarg);
return (-1);
}
break;
case 'k':
if (parse_hex(optarg, key1, 2 * AES_BLOCK_SIZE) != 24) {
fprintf(stderr, "invalid key1 specified: %s\n", optarg);
return (-1);
}
break;
case 'l':
if (parse_hex(optarg, key2, 2 * AES_BLOCK_SIZE) != 24) {
fprintf(stderr, "invalid key2 specified: %s\n", optarg);
return (-1);
}
break;
case 'm':
if (parse_hex(optarg, magic, 2 * AES_BLOCK_SIZE) != 24) {
fprintf(stderr, "invalid magic specified: %s\n", optarg);
return (-1);
}
break;
case 'i':
atakeyindex = strtol(optarg, &endptr, 0);
if (*endptr != '\0') {
fprintf(stderr, "invalid atakeyindex specified: %s\n", optarg);
return (-1);
}
break;
case 'a':
atakey_length = parse_hex(optarg, atakey, 2 * AES_BLOCK_SIZE);
if ((atakey_length != 16) && (atakey_length != 24)) {
fprintf(stderr, "invalid atakey specified: %s\n", optarg);
return (-1);
}
break;
default:
fprintf(stderr, "invalid option specified: %c\n", c);
return (-1);
break;
}
}
 
return (0);
}
 
static void
aes_cbc_encrypt(const unsigned char *iv, const unsigned char *key, int key_length,
const unsigned char *data, int data_length, unsigned char *out)
{
AES_KEY aes_key;
unsigned char cbc[AES_BLOCK_SIZE];
int i;
 
AES_set_encrypt_key(key, key_length, &aes_key);
 
memcpy(cbc, iv, AES_BLOCK_SIZE);
 
while (data_length >= AES_BLOCK_SIZE) {
for (i = 0; i < AES_BLOCK_SIZE; i++)
out[i] = cbc[i] ^ data[i];
 
AES_encrypt(out, out, &aes_key);
 
memcpy(cbc, out, AES_BLOCK_SIZE);
 
data += AES_BLOCK_SIZE;
out += AES_BLOCK_SIZE;
data_length -= AES_BLOCK_SIZE;
}
}
 
static void
aes_cbc_decrypt(const unsigned char *iv, const unsigned char *key, int key_length,
const unsigned char *data, int data_length, unsigned char *out)
{
AES_KEY aes_key;
unsigned char cbc[AES_BLOCK_SIZE];
unsigned char buf[AES_BLOCK_SIZE];
int i;
 
AES_set_decrypt_key(key, key_length, &aes_key);
 
memcpy(cbc, iv, AES_BLOCK_SIZE);
 
while (data_length >= AES_BLOCK_SIZE) {
memcpy(buf, data, AES_BLOCK_SIZE);
 
AES_decrypt(data, out, &aes_key);
 
for (i = 0; i < AES_BLOCK_SIZE; i++)
out[i] ^= cbc[i];
 
memcpy(cbc, buf, AES_BLOCK_SIZE);
 
data += AES_BLOCK_SIZE;
out += AES_BLOCK_SIZE;
data_length -= AES_BLOCK_SIZE;
}
}
 
static void
hex_fprintf(FILE *fp, const unsigned char *buf, size_t len)
{
int i;
 
if (len <= 0)
return;
 
for (i = 0; i < len; i++) {
if ((i > 0) && !(i % 16))
fprintf(fp, "\n");
 
fprintf(fp, "%02x ", buf[i]);
}
 
fprintf(fp, "\n");
}
 
static int
read_timeout(int fd, void *buf, size_t len, unsigned int timeout)
{
fd_set fds;
struct timeval tv;
int ret;
 
FD_ZERO(&fds);
FD_SET(fd, &fds);
 
tv.tv_sec = timeout / 1000000;
tv.tv_usec = timeout % 1000000;
 
ret = select(fd + 1, &fds, NULL, NULL, &tv);
if (ret <= 0)
return (-1);
 
return (read(fd, buf, len));
}
 
static int
kgen_flash(const char *device)
{
int fd;
unsigned char buf[4];
int ret;
 
fd = open(device, O_RDWR | O_NONBLOCK);
if (fd < 0)
return (-1);
 
memset(buf, 0, sizeof(buf));
*(uint32_t *) buf = 0x84;
 
ret = write(fd, buf, 4);
if (ret < 0) {
close(fd);
return (-1);
}
 
close(fd);
 
return (0);
}
 
static int
kgen1(const char *device, const unsigned char *iv, const unsigned char *rnd,
const unsigned char *key, unsigned char *out)
{
int fd;
unsigned char buf[0x50];
uint16_t status;
int ret;
 
fd = open(device, O_RDWR | O_NONBLOCK);
if (fd < 0)
return (-1);
 
memset(buf, 0, sizeof(buf));
*(uint32_t *) buf = 0x81;
*(uint16_t *) (buf + 4) = 0x1;
*(uint16_t *) (buf + 6) = 0x30;
memcpy(buf + 8, iv, 0x10);


aes_cbc_encrypt(iv, key, 8 * 24, rnd, 0x20, buf + 0x18);


if (verbose)
{{Reverse engineering}}<noinclude>[[Category:Main]]</noinclude>
hex_fprintf(stdout, buf, 0x44);
 
ret = write(fd, buf, 0x44);
if (ret < 0) {
close(fd);
return (-1);
}
 
ret = read_timeout(fd, out, 0x50, 1000000);
if (ret < 0) {
close(fd);
return (-1);
}
 
close(fd);
 
status = *(uint16_t *) out;
if (status != 0x2)
return (-2);
 
return (0);
}
 
static int
kgen2(const char *device, const unsigned char *iv, const unsigned char *rnd,
const unsigned char *key, unsigned char *out)
{
int fd;
unsigned char buf[0x34];
uint16_t status;
int ret;
 
fd = open(device, O_RDWR | O_NONBLOCK);
if (fd < 0)
return (-1);
 
memset(buf, 0, sizeof(buf));
*(uint32_t *) buf = 0x82;
*(uint16_t *) (buf + 4) = 0x3;
*(uint16_t *) (buf + 6) = 0x20;
 
aes_cbc_encrypt(iv, key, 8 * 24, rnd, 0x20, buf + 0x8);
 
if (verbose)
hex_fprintf(stdout, buf, 0x34);
 
ret = write(fd, buf, 0x34);
if (ret < 0) {
close(fd);
return (-1);
}
 
ret = read_timeout(fd, out, 2, 1000000);
if (ret < 0) {
close(fd);
return (-1);
}
 
close(fd);
 
status = *(uint16_t *) out;
if (status != 0x4)
return (-2);
 
return (0);
}
 
static int
kset(const char *device, const unsigned char *iv, const unsigned char *key,
const unsigned char *in, unsigned char *out)
{
int fd;
unsigned char buf[0x64];
uint16_t status;
int ret;
 
fd = open(device, O_RDWR | O_NONBLOCK);
if (fd < 0)
return (-1);
 
memset(buf, 0, sizeof(buf));
*(uint32_t *) buf = 0x83;
*(uint16_t *) (buf + 4) = 0x1;
*(uint16_t *) (buf + 6) = 0x50;
memcpy(buf + 8, iv, 0x10);
 
aes_cbc_encrypt(iv, key, 8 * 24, in, 0x40, buf + 0x18);
 
if (verbose)
hex_fprintf(stdout, buf, 0x64);
 
ret = write(fd, buf, 0x64);
if (ret < 0) {
close(fd);
return (-1);
}
 
ret = read_timeout(fd, out, 0x10, 1000000);
if (ret < 0) {
close(fd);
return (-1);
}
 
close(fd);
 
status = *(uint16_t *) out;
if (status != 0x2)
return (-2);
 
return (0);
}
 
static int
sb_clear(const char *device, unsigned int arg)
{
int fd;
unsigned char buf[0x8];
int ret;
 
fd = open(device, O_RDWR | O_NONBLOCK);
if (fd < 0)
return (-1);
 
memset(buf, 0, sizeof(buf));
*(uint32_t *) buf = 0x87;
*(uint32_t *) (buf + 4) = arg;
 
if (verbose)
hex_fprintf(stdout, buf, 0x8);
 
ret = write(fd, buf, 0x8);
if (ret < 0) {
close(fd);
return (-1);
}
 
close(fd);
 
return (0);
}
 
int
main(int argc, char **argv)
{
unsigned char buf[256];
unsigned char rnd4[2 * AES_BLOCK_SIZE];
unsigned char key3[2 * AES_BLOCK_SIZE];
int i;
int ret;
 
ret = parse_opts(argc, argv);
if (ret)
exit(255);
 
fprintf(stdout, "rnd1: ");
hex_fprintf(stdout, rnd1, 0x10);
 
fprintf(stdout, "rnd2: ");
hex_fprintf(stdout, rnd2, 0x20);
 
fprintf(stdout, "rnd3: ");
hex_fprintf(stdout, rnd3, 0x10);
 
fprintf(stdout, "magic: ");
hex_fprintf(stdout, magic, 0x18);
 
fprintf(stdout, "atakey: ");
hex_fprintf(stdout, atakey, 0x18);
 
ret = kgen1(device, rnd1, rnd2, key1, buf);
if (ret) {
fprintf(stderr, "could not kgen1\n");
goto failed;
}
 
if (verbose)
hex_fprintf(stdout, buf, 0x50);
 
aes_cbc_decrypt(rnd1, key2, 8 * 24, buf + 0x4, 0x20, buf + 0x4);
 
if (memcmp(rnd2, buf + 0x4, 0x20)) {
fprintf(stderr, "rnd2 mismatch\n");
goto failed;
}
 
aes_cbc_decrypt(rnd1, key2, 8 * 24, buf + 0x24, 0x20, rnd4);
 
fprintf(stdout, "rnd4: ");
hex_fprintf(stdout, rnd4, 0x20);
 
ret = kgen2(device, rnd1, rnd4, key1, buf);
if (ret) {
fprintf(stderr, "could not kgen2\n");
goto failed;
}
 
if (verbose)
hex_fprintf(stdout, buf, 0x2);
 
for (i = 0; i < 0x20; i++)
key3[i] = rnd2[i] ^ rnd4[i];
 
fprintf(stdout, "key3: ");
hex_fprintf(stdout, key3, 0x20);
 
memset(buf, 0, 0x40);
memcpy(buf, magic, 0x18);
buf[0x18 + 0] = 0x0;
buf[0x18 + 1] = 0x0;
buf[0x18 + 2] = (atakeyindex >= 0x100) ? 0x2 : 0x3;
buf[0x18 + 3] = atakeyindex & 0xf;
buf[0x18 + 7] = (atakeyindex >= 0x110) ? 0x0 : 0x1;
memcpy(buf + 0x20, atakey, atakey_length);
 
if (verbose)
hex_fprintf(stdout, buf, 0x40);
 
ret = kset(device, rnd3, key3, buf, buf);
if (ret) {
fprintf(stderr, "could not kset\n");
goto failed;
}
 
if (verbose)
hex_fprintf(stdout, buf, 0x10);
 
if (atakeyindex >= 0x110) {
ret = sb_clear(device, (atakeyindex & 0xf) + 1);
if (ret) {
fprintf(stderr, "could not sb clear\n");
goto failed;
}
}
 
exit(0);
 
failed:
 
kgen_flash(device);
 
exit(1);
}
</pre>
http://pastie.org/4503091

Latest revision as of 06:41, 23 May 2014

Introduction[edit | edit source]

  • ENCDEC is the encoder/decoder, integrated inside South Bridge
  • The following information was reverse engineered from LV1, Storage Manager in LPAR1, sb_iso_spu_module.self and sv_iso_spu_module.self.

Linux Driver ps3encdec[edit | edit source]

  • I'm using this driver to set/clear my ATA and VFLASH keys.
  • Tested on Linux 3.5.1.
  • You can send all supported ENCDEC commands with this driver.

Interesting Facts[edit | edit source]

  • HDD sectors arrive in LV1 with tweak values already XORed.
  • But VFLASH sectors are first encrypted/decrypted with ENCDEC keys and the fact is that VFLASH sectors are NOT already XORed with tweak values. LV1 does pre- and post-XORing with tweak values.
  • LV1 allocates a DMA region where it stores the sector number for each requested sector and ENCDEC encryptes these tweak values.
  • After that, LV1 XORes encrypted tweak values.
  • See encdec_device_enqueue_decsec_request and EdecXTS_XorWithMask in LV1.
  • I patched my LV1 for testing and killed XORing with encrypted tweak values. After that VFLASH sectors were encrypted/decrypted without tweak values, only with XTS data key.

Establish Secure Communication Channel[edit | edit source]

  • First host and ENCDEC device exchange random numbers.
  • From the exchanged random numbers host and ENCDEC device compute the session key.
  • ENCDEC commands, e.g. to set ATA keys, are encrypted with the session key and AES-CBC-192.
  • Before a secure communication channel is established, host and ENCDEC device use static AES-CBC-192 keys to encrypt communication data. The static keys can be found e.g. in sb_iso_spu_module.self or sv_iso_spu_module.self.
  • Static ENCDEC keys depend on SB bus version. To get your SB bus version, read v2 of repository node SB bus id.

SB bus id from 3.15: 

....bus. 00 00 00 00 62 75 73 01
id...... 69 64 00 00 00 00 00 00
........ 00 00 00 00 00 00 00 00
........ 00 00 00 00 00 00 00 00
........ 00 00 00 00 00 00 00 01
........ 00 00 00 00 03 00 01 03        <-------- SB bus id v2

# Dumping it with ps3lv1call-tools

~/ps3lv1call-tools$ sudo ./ps3lv1call 91 1 0x0000000062757301 0x6964000000000000 0 0
0000000000000001 0000000004000103
  • During the communication, host and ENCDEC device use random IVs which are sent unencrypted together with encrypted payload.
  • The ENCDEC commands, which are encrypted with the session key, contain magic 24 bytes which are checked by ENCDEC device and if some bits are not correct then the command is denied. The magic bytes can be found in sb_iso_spu_module.self too.
  • The format of ENCDEC command to set ATA keys is slightly different from the ENCDEC command to set ENCDEC keys.

ENCDEC Commands[edit | edit source]

KGEN1 (0x81)[edit | edit source]

  • Used by host to send host random to ENCDEC device and receive ENCDEC random from ENCDEC device.
  • Sent data is encrypted with host static key and received data is encrypted with ENCDEC static key.

KGEN2 (0x82)[edit | edit source]

  • Used by host to send host and ENCDEC randoms to ENCDEC device.
  • Sent data is encrypted with host static key.

KSET (0x83)[edit | edit source]

  • Used by host to send ENCDEC command to ENCDEC device.
  • Sent data is encrypted with the session key.
  • It contains magic 24 bytes from sb_iso_spu_module.self.

KGEN_FLASH (0x84)[edit | edit source]

  • The command resets ENCDEC device state.
  • LV1 calls this command "EdecKgenFlash", probably correct name is "EdecKgenFlush" :)

SB_CLEAR (0x87)[edit | edit source]

  • No clue what it does but it is sent by Storage Manager after ATA keys are cleared.

Set ATA Keys[edit | edit source]

Set ENCDEC Keys[edit | edit source]

Linux Application[edit | edit source]

  • Here the Linux application i use with my ps3encdec device driver to set/clear ATA/ENCDEC keys on my PS3.

See my GIT repo: http://gitorious.ps3dev.net/ps3linux/encdec


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