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hos: Fix pkg2 keygen with newer sept

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This change also adds support for older sept binaries.
This commit is contained in:
CTCaer 2019-12-08 18:32:09 +02:00
parent 97d3b745d9
commit 4c5a78de6f
2 changed files with 135 additions and 29 deletions
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84
bootloader/hos/pkg2.c
View file

@ -1042,7 +1042,9 @@ const char* pkg2_patch_kips(link_t *info, char* patchNames)
if (!strcmp(currPatchset->name, "emummc"))
{
emummc_patch_selected = true;
emummc_patch_selected = true;
patchesApplied |= appliedMask;
break;
}
@ -1121,10 +1123,29 @@ const char* pkg2_patch_kips(link_t *info, char* patchNames)
static const u8 mkey_keyseed_8xx[][0x10] =
{
{0x4D, 0xD9, 0x98, 0x42, 0x45, 0x0D, 0xB1, 0x3C, 0x52, 0x0C, 0x9A, 0x44, 0xBB, 0xAD, 0xAF, 0x80}, // Master key 8 encrypted with 9.
{0xB8, 0x96, 0x9E, 0x4A, 0x00, 0x0D, 0xD6, 0x28, 0xB3, 0xD1, 0xDB, 0x68, 0x5F, 0xFB, 0xE1, 0x2A} // Master key 9 encrypted with 10.
// Master key 8 encrypted with 9. (8.1.0 with 9.0.0)
{ 0x4D, 0xD9, 0x98, 0x42, 0x45, 0x0D, 0xB1, 0x3C, 0x52, 0x0C, 0x9A, 0x44, 0xBB, 0xAD, 0xAF, 0x80 },
// Master key 9 encrypted with 10. (9.0.0 with 9.1.0)
{ 0xB8, 0x96, 0x9E, 0x4A, 0x00, 0x0D, 0xD6, 0x28, 0xB3, 0xD1, 0xDB, 0x68, 0x5F, 0xFB, 0xE1, 0x2A }
};
static bool _pkg2_key_unwrap_validate(pkg2_hdr_t *tmp_test, pkg2_hdr_t *hdr, u8 src_slot, u8 *mkey, const u8 *key_seed)
{
// Decrypt older encrypted mkey.
se_aes_crypt_ecb(src_slot, 0, mkey, 0x10, key_seed, 0x10);
// Set and unwrap pkg2 key.
se_aes_key_clear(9);
se_aes_key_set(9, mkey, 0x10);
se_aes_unwrap_key(9, 9, package2_keyseed);
// Decrypt header.
se_aes_crypt_ctr(9, tmp_test, sizeof(pkg2_hdr_t), hdr, sizeof(pkg2_hdr_t), hdr);
// Return if header is valid.
return (tmp_test->magic == PKG2_MAGIC);
}
pkg2_hdr_t *pkg2_decrypt(void *data, u8 kb)
{
pkg2_hdr_t mkey_test;
@ -1139,25 +1160,58 @@ pkg2_hdr_t *pkg2_decrypt(void *data, u8 kb)
// Skip header.
pdata += sizeof(pkg2_hdr_t);
//! Check if we need to decrypt with newer mkeys. Valid for 8.1.0 and up.
//! Check if we need to decrypt with newer mkeys. Valid for sept for 8.1.0 and up.
se_aes_crypt_ctr(8, &mkey_test, sizeof(pkg2_hdr_t), hdr, sizeof(pkg2_hdr_t), hdr);
if (mkey_test.magic == PKG2_MAGIC)
goto key_found;
// Decrypt older pkg2 via new mkeys.
if ((kb >= KB_FIRMWARE_VERSION_810) && (kb < KB_FIRMWARE_VERSION_MAX))
{
u8 tmp_mkey[0x10];
// Decrypt older encrypted mkey.
se_aes_crypt_ecb(12, 0, tmp_mkey, 0x10, mkey_keyseed_8xx[KB_FIRMWARE_VERSION_MAX - kb - 1], 0x10);
// Set and unwrap pkg2 key.
se_aes_key_set(9, tmp_mkey, 0x10);
se_aes_unwrap_key(9, 9, package2_keyseed);
u8 decr_slot = 12; // Sept mkey.
u8 mkey_seeds_cnt = sizeof(mkey_keyseed_8xx) / 0x10;
u8 mkey_seeds_idx = mkey_seeds_cnt; // Real index + 1.
u8 mkey_seeds_min_idx = mkey_seeds_cnt - (KB_FIRMWARE_VERSION_MAX - kb);
// Decrypt header and test if it's valid.
se_aes_crypt_ctr(9, &mkey_test, sizeof(pkg2_hdr_t), hdr, sizeof(pkg2_hdr_t), hdr);
while (mkey_seeds_cnt)
{
// Decrypt and validate mkey.
int res = _pkg2_key_unwrap_validate(&mkey_test, hdr, decr_slot,
tmp_mkey, mkey_keyseed_8xx[mkey_seeds_idx - 1]);
if (mkey_test.magic == PKG2_MAGIC)
keyslot = 9;
else
se_aes_key_clear(9);
if (res)
{
keyslot = 9;
goto key_found;
}
else
{
// Set current mkey in order to decrypt a lower mkey.
mkey_seeds_idx--;
se_aes_key_clear(9);
se_aes_key_set(9, tmp_mkey, 0x10);
decr_slot = 9; // Temp key.
// Check if we tried last key for that pkg2 version.
// And start with a lower mkey in case sept is older.
if (mkey_seeds_idx == mkey_seeds_min_idx)
{
mkey_seeds_cnt--;
mkey_seeds_idx = mkey_seeds_cnt;
decr_slot = 12; // Sept mkey.
}
// Out of keys. pkg2 is latest or process failed.
if (!mkey_seeds_cnt)
se_aes_key_clear(9);
}
}
}
key_found:
// Decrypt header.
se_aes_crypt_ctr(keyslot, hdr, sizeof(pkg2_hdr_t), hdr, sizeof(pkg2_hdr_t), hdr);
//gfx_hexdump((u32)hdr, hdr, 0x100);

80
nyx/nyx_gui/hos/pkg2.c
View file

@ -83,10 +83,29 @@ DPRINTF(" kip1 %d:%s @ %08X (%08X)\n", i, kip1->name, (u32)kip1, ki->size);
static const u8 mkey_keyseed_8xx[][0x10] =
{
{0x4D, 0xD9, 0x98, 0x42, 0x45, 0x0D, 0xB1, 0x3C, 0x52, 0x0C, 0x9A, 0x44, 0xBB, 0xAD, 0xAF, 0x80}, // Master key 8 encrypted with 9.
{0xB8, 0x96, 0x9E, 0x4A, 0x00, 0x0D, 0xD6, 0x28, 0xB3, 0xD1, 0xDB, 0x68, 0x5F, 0xFB, 0xE1, 0x2A} // Master key 9 encrypted with 10.
// Master key 8 encrypted with 9. (8.1.0 with 9.0.0)
{ 0x4D, 0xD9, 0x98, 0x42, 0x45, 0x0D, 0xB1, 0x3C, 0x52, 0x0C, 0x9A, 0x44, 0xBB, 0xAD, 0xAF, 0x80 },
// Master key 9 encrypted with 10. (9.0.0 with 9.1.0)
{ 0xB8, 0x96, 0x9E, 0x4A, 0x00, 0x0D, 0xD6, 0x28, 0xB3, 0xD1, 0xDB, 0x68, 0x5F, 0xFB, 0xE1, 0x2A }
};
static bool _pkg2_key_unwrap_validate(pkg2_hdr_t *tmp_test, pkg2_hdr_t *hdr, u8 src_slot, u8 *mkey, const u8 *key_seed)
{
// Decrypt older encrypted mkey.
se_aes_crypt_ecb(src_slot, 0, mkey, 0x10, key_seed, 0x10);
// Set and unwrap pkg2 key.
se_aes_key_clear(9);
se_aes_key_set(9, mkey, 0x10);
se_aes_unwrap_key(9, 9, package2_keyseed);
// Decrypt header.
se_aes_crypt_ctr(9, tmp_test, sizeof(pkg2_hdr_t), hdr, sizeof(pkg2_hdr_t), hdr);
// Return if header is valid.
return (tmp_test->magic == PKG2_MAGIC);
}
pkg2_hdr_t *pkg2_decrypt(void *data, u8 kb)
{
pkg2_hdr_t mkey_test;
@ -101,25 +120,58 @@ pkg2_hdr_t *pkg2_decrypt(void *data, u8 kb)
// Skip header.
pdata += sizeof(pkg2_hdr_t);
//! Check if we need to decrypt with newer mkeys. Valid for 8.1.0 and up.
//! Check if we need to decrypt with newer mkeys. Valid for sept for 8.1.0 and up.
se_aes_crypt_ctr(8, &mkey_test, sizeof(pkg2_hdr_t), hdr, sizeof(pkg2_hdr_t), hdr);
if (mkey_test.magic == PKG2_MAGIC)
goto key_found;
// Decrypt older pkg2 via new mkeys.
if ((kb >= KB_FIRMWARE_VERSION_810) && (kb < KB_FIRMWARE_VERSION_MAX))
{
u8 tmp_mkey[0x10];
// Decrypt older encrypted mkey.
se_aes_crypt_ecb(12, 0, tmp_mkey, 0x10, mkey_keyseed_8xx[KB_FIRMWARE_VERSION_MAX - kb - 1], 0x10);
// Set and unwrap pkg2 key.
se_aes_key_set(9, tmp_mkey, 0x10);
se_aes_unwrap_key(9, 9, package2_keyseed);
u8 decr_slot = 12; // Sept mkey.
u8 mkey_seeds_cnt = sizeof(mkey_keyseed_8xx) / 0x10;
u8 mkey_seeds_idx = mkey_seeds_cnt; // Real index + 1.
u8 mkey_seeds_min_idx = mkey_seeds_cnt - (KB_FIRMWARE_VERSION_MAX - kb);
// Decrypt header and test if it's valid.
se_aes_crypt_ctr(9, &mkey_test, sizeof(pkg2_hdr_t), hdr, sizeof(pkg2_hdr_t), hdr);
while (mkey_seeds_cnt)
{
// Decrypt and validate mkey.
int res = _pkg2_key_unwrap_validate(&mkey_test, hdr, decr_slot,
tmp_mkey, mkey_keyseed_8xx[mkey_seeds_idx - 1]);
if (mkey_test.magic == PKG2_MAGIC)
keyslot = 9;
else
se_aes_key_clear(9);
if (res)
{
keyslot = 9;
goto key_found;
}
else
{
// Set current mkey in order to decrypt a lower mkey.
mkey_seeds_idx--;
se_aes_key_clear(9);
se_aes_key_set(9, tmp_mkey, 0x10);
decr_slot = 9; // Temp key.
// Check if we tried last key for that pkg2 version.
// And start with a lower mkey in case sept is older.
if (mkey_seeds_idx == mkey_seeds_min_idx)
{
mkey_seeds_cnt--;
mkey_seeds_idx = mkey_seeds_cnt;
decr_slot = 12; // Sept mkey.
}
// Out of keys. pkg2 is latest or process failed.
if (!mkey_seeds_cnt)
se_aes_key_clear(9);
}
}
}
key_found:
// Decrypt header.
se_aes_crypt_ctr(keyslot, hdr, sizeof(pkg2_hdr_t), hdr, sizeof(pkg2_hdr_t), hdr);
//gfx_hexdump((u32)hdr, hdr, 0x100);