mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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91 lines
2.9 KiB
C
91 lines
2.9 KiB
C
#include <stdbool.h>
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#include <stdint.h>
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#include "utils.h"
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#include "masterkey.h"
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#include "se.h"
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unsigned int g_mkey_revision = 0;
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bool g_determined_mkey_revision = false;
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uint8_t g_old_masterkeys[MASTERKEY_REVISION_MAX][0x10];
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/* TODO: Dev keys. */
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/* TODO: Extend with new vectors, as needed. */
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const uint8_t mkey_vectors[MASTERKEY_REVISION_MAX][0x10] =
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{
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{0x0C, 0xF0, 0x59, 0xAC, 0x85, 0xF6, 0x26, 0x65, 0xE1, 0xE9, 0x19, 0x55, 0xE6, 0xF2, 0x67, 0x3D}, /* Zeroes encrypted with Master Key 00. */
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{0x29, 0x4C, 0x04, 0xC8, 0xEB, 0x10, 0xED, 0x9D, 0x51, 0x64, 0x97, 0xFB, 0xF3, 0x4D, 0x50, 0xDD}, /* Master key 00 encrypted with Master key 01. */
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{0xDE, 0xCF, 0xEB, 0xEB, 0x10, 0xAE, 0x74, 0xD8, 0xAD, 0x7C, 0xF4, 0x9E, 0x62, 0xE0, 0xE8, 0x72}, /* Master key 01 encrypted with Master key 02. */
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{0x0A, 0x0D, 0xDF, 0x34, 0x22, 0x06, 0x6C, 0xA4, 0xE6, 0xB1, 0xEC, 0x71, 0x85, 0xCA, 0x4E, 0x07}, /* Master key 02 encrypted with Master key 03. */
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};
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bool check_mkey_revision(unsigned int revision) {
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uint8_t final_vector[0x10];
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unsigned int check_keyslot = KEYSLOT_SWITCH_MASTERKEY;
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if (revision > 0) {
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/* Generate old master key array. */
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for (unsigned int i = revision; i > 0; i--) {
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se_aes_ecb_decrypt_block(check_keyslot, g_old_masterkeys[i-1], 0x10, mkey_vectors[i], 0x10);
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set_aes_keyslot(KEYSLOT_SWITCH_TEMPKEY, g_old_masterkeys[i-1], 0x10);
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check_keyslot = KEYSLOT_SWITCH_TEMPKEY;
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}
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}
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se_aes_ecb_decrypt_block(check_keyslot, final_vector, 0x10, mkey_vectors[0], 0x10);
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for (unsigned int i = 0; i < 0x10; i++) {
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if (final_vector[i] != 0) {
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return false;
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}
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}
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return true;
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}
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void mkey_detect_revision(void) {
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if (g_determined_mkey_revision) {
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panic();
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}
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for (unsigned int rev = 0; rev < MASTERKEY_REVISION_MAX; rev++) {
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if (check_mkey_revision(rev)) {
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g_determined_mkey_revision = true;
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g_mkey_revision = rev;
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break;
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}
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}
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/* We must have determined the master key, or we're not running on a Switch. */
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/* TODO: When panic is implemented, make this a really distinctive color. */
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/* Maybe bright red? */
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if (!g_determined_mkey_revision) {
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panic();
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}
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}
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unsigned int mkey_get_revision(void) {
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if (!g_determined_mkey_revision) {
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panic();
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}
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return g_mkey_revision;
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}
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unsigned int mkey_get_keyslot(unsigned int revision) {
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if (!g_determined_mkey_revision || revision >= MASTERKEY_REVISION_MAX) {
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panic();
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}
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if (revision > g_mkey_revision) {
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panic();
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}
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if (revision == g_mkey_revision) {
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return KEYSLOT_SWITCH_MASTERKEY;
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} else {
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/* Load into a temp keyslot. */
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set_aes_keyslot(KEYSLOT_SWITCH_TEMPKEY, g_old_masterkeys[revision], 0x10);
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return KEYSLOT_SWITCH_TEMPKEY;
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}
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}
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