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Implement NX Key Derivation.
This commit is contained in:
Michael Scire
parent
57853602df
commit
6ed9123c24
18
fusee/src/exocfg.h
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18
fusee/src/exocfg.h
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#ifndef FUSEE_EXOSPHERE_CONFIG_H
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#define FUSEE_EXOSPHERE_CONFIG_H
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/* This serves to set configuration for *exosphere itself*, separate from the SecMon Exosphere mimics. */
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/* "XBC0" */
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#define MAGIC_EXOSPHERE_BOOTCONFIG (0x30434258)
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#define EXOSPHERE_TARGET_FIRMWARE_100 1
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#define EXOSPHERE_TARGET_FIRMWARE_200 2
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#define EXOSPHERE_TARGET_FIRMWARE_300 3
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#define EXOSPHERE_TARGET_FIRMWARE_400 4
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#define EXOSPHERE_TARGET_FIRMWARE_500 5
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/* TODO: What should this be, for release? */
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#define EXOSPHERE_TARGET_FIRMWARE_DEFAULT_FOR_DEBUG EXOSPHERE_TARGET_FIRMWARE_400
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#endif
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132
fusee/src/key_derivation.c
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fusee/src/key_derivation.c
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#include "key_derivation.h"
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#include "se.h"
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#include "exocfg.h"
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static const u8 keyblob_seeds[MASTERKEY_REVISION_MAX][0x10] =
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{
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{0xDF, 0x20, 0x6F, 0x59, 0x44, 0x54, 0xEF, 0xDC, 0x70, 0x74, 0x48, 0x3B, 0x0D, 0xED, 0x9F, 0xD3}, /* Keyblob seed 00. */
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{0x0C, 0x25, 0x61, 0x5D, 0x68, 0x4C, 0xEB, 0x42, 0x1C, 0x23, 0x79, 0xEA, 0x82, 0x25, 0x12, 0xAC}, /* Keyblob seed 01. */
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{0x33, 0x76, 0x85, 0xEE, 0x88, 0x4A, 0xAE, 0x0A, 0xC2, 0x8A, 0xFD, 0x7D, 0x63, 0xC0, 0x43, 0x3B}, /* Keyblob seed 02. */
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{0x2D, 0x1F, 0x48, 0x80, 0xED, 0xEC, 0xED, 0x3E, 0x3C, 0xF2, 0x48, 0xB5, 0x65, 0x7D, 0xF7, 0xBE}, /* Keyblob seed 03. */
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{0xBB, 0x5A, 0x01, 0xF9, 0x88, 0xAF, 0xF5, 0xFC, 0x6C, 0xFF, 0x07, 0x9E, 0x13, 0x3C, 0x39, 0x80}, /* Keyblob seed 04. */
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};
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static const u8 keyblob_mac_seed[0x10] =
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{
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0x59, 0xC7, 0xFB, 0x6F, 0xBE, 0x9B, 0xBE, 0x87, 0x65, 0x6B, 0x15, 0xC0, 0x53, 0x73, 0x36, 0xA5
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};
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static const uint8_t masterkey_seed[0x10] =
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{
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0xD8, 0xA2, 0x41, 0x0A, 0xC6, 0xC5, 0x90, 0x01, 0xC6, 0x1D, 0x6A, 0x26, 0x7C, 0x51, 0x3F, 0x3C
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};
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static const uint8_t devicekey_seed[0x10] =
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{
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0x4F, 0x02, 0x5F, 0x0E, 0xB6, 0x6D, 0x11, 0x0E, 0xDC, 0x32, 0x7D, 0x41, 0x86, 0xC2, 0xF4, 0x78
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};
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static const uint8_t devicekey_4x_seed[0x10] =
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{
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0x0C, 0x91, 0x09, 0xDB, 0x93, 0x93, 0x07, 0x81, 0x07, 0x3C, 0xC4, 0x16, 0x22, 0x7C, 0x6C, 0x28
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};
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static const uint8_t masterkey_4x_seed[0x10] =
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{
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0x2D, 0xC1, 0xF4, 0x8D, 0xF3, 0x5B, 0x69, 0x33, 0x42, 0x10, 0xAC, 0x65, 0xDA, 0x90, 0x46, 0x66
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};
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void get_tsec_key(void *dst) {
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/* TODO: Implement this method. Attempt to read TSEC fw from NAND, or from SD if that fails. */
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}
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void get_keyblob(void *dst, u32 revision) {
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if (revision >= 0x20) {
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generic_panic();
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}
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/* TODO: Read the appropriate keyblob from eMMC Boot0 partition. */
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}
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bool safe_memcmp(u8 *a, u8 *b, u32 sz) {
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u8 different = 0;
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for (u32 i = 0; i < sz; i++) {
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different |= a[i] ^ b[i];
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}
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return different != 0;
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}
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/* Derive all Switch keys. */
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void derive_nx_keydata(u32 target_firmware) {
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u8 work_buffer[0x10];
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nx_keyblob_t keyblob;
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/* TODO: Set keyslot flags properly in preparation of derivation. */
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set_aes_keyslot_flags(0xE, 0x15);
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set_aes_keyslot_flags(0xD, 0x15);
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/* Set TSEC key. */
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get_tsec_key(work_buffer);
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set_aes_keyslot(0xD, work_buffer, 0x10);
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/* Get keyblob, always try to set up the highest possible master key. */
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/* TODO: Should we iterate, trying lower keys on failure? */
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get_keyblob(&keyblob, MASTERKEY_REVISION_500_CURRENT);
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/* Derive both keyblob key 1, and keyblob key latest. */
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se_aes_ecb_decrypt_block(0xD, work_buffer, 0x10, keyblob_seeds[MASTERKEY_REVISION_100_230], 0x10);
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decrypt_data_into_keyslot(0xF, 0xE, work_buffer, 0x10);
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se_aes_ecb_decrypt_block(0xD, work_buffer, 0x10, keyblob_seeds[MASTERKEY_REVISION_500_CURRENT], 0x10);
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decrypt_data_into_keyslot(0xD, 0xE, work_buffer, 0x10);
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/* Clear the SBK. */
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clear_aes_keyslot(0xE);
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decrypt_data_into_keyslot(0xB, 0xD, keyblob_mac_seed, 0x10);
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/* Validate keyblob. */
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se_compute_aes_128_cmac(0xB, work_buffer, 0x10, keyblob.mac + sizeof(keyblob.mac), sizeof(keyblob) - sizeof(keyblob.mac));
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if (safe_memcmp(keyblob.mac, work_buffer, 0x10)) {
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generic_panic();
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}
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/* Decrypt keyblob. */
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se_aes_ctr_crypt(0xD, keyblob.data, sizeof(keyblob.data), keyblob.data, sizeof(keyblob.data), keyblob.ctr, sizeof(keyblob.ctr));
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/* Get needed data. */
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set_aes_keyslot(0xC, keyblob.keys[0], 0x10);
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/* We don't need the Package1 Key, but for reference: set_aes_keyslot(0xB, keyblob.keys[8], 0x10); */
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/* Clear keyblob. */
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memset(keyblob.data, 0, sizeof(keyblob.data));
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/* Derive keys for Exosphere, lock critical keyslots. */
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switch (target_firmware) {
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case EXOSPHERE_TARGET_FIRMWARE_100:
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case EXOSPHERE_TARGET_FIRMWARE_200:
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case EXOSPHERE_TARGET_FIRMWARE_300:
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decrypt_data_into_keyslot(0xD, 0xF, devicekey_seed, 0x10);
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decrypt_data_into_keyslot(0xC, 0xC, masterkey_seed, 0x10);
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set_aes_keyslot_flags(0xC, 0xFF);
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set_aes_keyslot_flags(0xD, 0xFF);
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break;
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case EXOSPHERE_TARGET_FIRMWARE_400:
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decrypt_data_into_keyslot(0xD, 0xF, devicekey_4x_seed, 0x10);
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decrypt_data_into_keyslot(0xF, 0xF, devicekey_seed, 0x10);
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decrypt_data_into_keyslot(0xE, 0xC, masterkey_4x_seed, 0x10);
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decrypt_data_into_keyslot(0xC, 0xC, masterkey_seed, 0x10);
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set_aes_keyslot_flags(0xC, 0xFF);
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set_aes_keyslot_flags(0xF, 0xFF);
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break;
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case EXOSPHERE_TARGET_FIRMWARE_500:
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decrypt_data_into_keyslot(0xA, 0xF, devicekey_4x_seed, 0x10);
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decrypt_data_into_keyslot(0xF, 0xF, devicekey_seed, 0x10);
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decrypt_data_into_keyslot(0xE, 0xC, masterkey_4x_seed, 0x10);
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decrypt_data_into_keyslot(0xC, 0xC, masterkey_seed, 0x10);
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set_aes_keyslot_flags(0xC, 0xFF);
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set_aes_keyslot_flags(0xF, 0xFF);
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break;
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default:
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generic_panic();
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}
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}
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28
fusee/src/key_derivation.h
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28
fusee/src/key_derivation.h
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#ifndef FUSEE_KEYDERIVATION_H
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#define FUSEE_KEYDERIVATION_H
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#include "hwinit/tsec.h"
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/* TODO: Update to 0x6 on release of new master key. */
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#define MASTERKEY_REVISION_MAX 0x5
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#define MASTERKEY_REVISION_100_230 0x00
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#define MASTERKEY_REVISION_300 0x01
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#define MASTERKEY_REVISION_301_302 0x02
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#define MASTERKEY_REVISION_400_410 0x03
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#define MASTERKEY_REVISION_500_CURRENT 0x04
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#define MASTERKEY_NUM_NEW_DEVICE_KEYS (MASTERKEY_REVISION_MAX - MASTERKEY_REVISION_400_410)
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typedef struct {
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u8 mac[0x10];
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u8 ctr[0x10];
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union {
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u8 data[0x90];
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u8 keys[9][0x10];
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};
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} nx_keyblob_t;
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void derive_nx_keydata(u32 target_firmware);
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#endif
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@ -17,7 +17,8 @@ __attribute__ ((noreturn)) void panic(uint32_t code) {
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/* For now, just use NX BOOTLOADER's panic. */
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fuse_disable_programming();
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APBDEV_PMC_CRYPTO_OP_0 = 1; /* Disable all SE operations. */
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watchdog_reboot();
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/* TODO: watchdog_reboot(); */
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while (1) { }
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}
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__attribute__ ((noreturn)) void generic_panic(void) {
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