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keys: Move RSA functions out of keys.c

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shchmue 2022-11-05 15:41:16 -07:00
parent 1b2c829ca0
commit dcf4bca30c
9 changed files with 266 additions and 241 deletions
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88
source/keys/es_crypto.c
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@ -16,7 +16,16 @@
#include "es_crypto.h"
#include "cal0_read.h"
#include "../config.h"
#include <gfx_utils.h>
#include "../gfx/tui.h"
#include <mem/minerva.h>
#include <sec/se.h>
#include <sec/se_t210.h>
#include <string.h>
extern hekate_config h_cfg;
@ -56,3 +65,82 @@ void es_derive_rsa_kek_original(key_storage_t *keys, void *out_rsa_kek, bool is_
const u32 option = SET_SEAL_KEY_INDEX(SEAL_KEY_IMPORT_ES_DEVICE_KEY) | NOT_DEVICE_UNIQUE;
derive_rsa_kek(KS_AES_ECB, keys, out_rsa_kek, eticket_rsa_kekek_source, kek_source, generation, option);
}
bool decrypt_eticket_rsa_key(key_storage_t *keys, void *buffer, bool is_dev) {
if (!cal0_read(KS_BIS_00_TWEAK, KS_BIS_00_CRYPT, buffer)) {
return false;
}
nx_emmc_cal0_t *cal0 = (nx_emmc_cal0_t *)buffer;
u32 generation = 0;
const void *encrypted_key = NULL;
const void *iv = NULL;
u32 key_size = 0;
void *ctr_key = NULL;
if (!cal0_get_eticket_rsa_key(cal0, &encrypted_key, &key_size, &iv, &generation)) {
return false;
}
// Handle legacy case
if (key_size == ETICKET_RSA_KEYPAIR_SIZE) {
u32 temp_key[SE_KEY_128_SIZE / 4] = {0};
es_derive_rsa_kek_legacy(keys, temp_key);
ctr_key = temp_key;
se_aes_key_set(KS_AES_CTR, ctr_key, SE_KEY_128_SIZE);
se_aes_crypt_ctr(KS_AES_CTR, &keys->eticket_rsa_keypair, sizeof(keys->eticket_rsa_keypair), encrypted_key, sizeof(keys->eticket_rsa_keypair), iv);
if (test_eticket_rsa_keypair(&keys->eticket_rsa_keypair)) {
memcpy(keys->eticket_rsa_kek, ctr_key, sizeof(keys->eticket_rsa_kek));
return true;
}
// Fall through and try usual method if not applicable
}
if (generation) {
es_derive_rsa_kek_device_unique(keys, keys->eticket_rsa_kek_personalized, generation, is_dev);
ctr_key = keys->eticket_rsa_kek_personalized;
} else {
ctr_key = keys->eticket_rsa_kek;
}
se_aes_key_set(KS_AES_CTR, ctr_key, SE_KEY_128_SIZE);
se_aes_crypt_ctr(KS_AES_CTR, &keys->eticket_rsa_keypair, sizeof(keys->eticket_rsa_keypair), encrypted_key, sizeof(keys->eticket_rsa_keypair), iv);
if (!test_eticket_rsa_keypair(&keys->eticket_rsa_keypair)) {
EPRINTF("Invalid eticket keypair.");
memset(&keys->eticket_rsa_keypair, 0, sizeof(keys->eticket_rsa_keypair));
return false;
}
return true;
}
void es_decode_tickets(u32 buf_size, titlekey_buffer_t *titlekey_buffer, u32 remaining, u32 total, u32 *titlekey_count, u32 x, u32 y, u32 *pct, u32 *last_pct, bool is_personalized) {
ticket_t *curr_ticket = (ticket_t *)titlekey_buffer->read_buffer;
for (u32 i = 0; i < MIN(buf_size / sizeof(ticket_t), remaining) * sizeof(ticket_t) && curr_ticket->signature_type != 0; i += sizeof(ticket_t), curr_ticket++) {
minerva_periodic_training();
*pct = (total - remaining) * 100 / total;
if (*pct > *last_pct && *pct <= 100) {
*last_pct = *pct;
tui_pbar(x, y, *pct, COLOR_GREEN, 0xFF155500);
}
// This is in case an encrypted volatile ticket is left behind
if (curr_ticket->signature_type != TICKET_SIG_TYPE_RSA2048_SHA256)
continue;
u8 *curr_titlekey = curr_ticket->titlekey_block;
const u32 block_size = SE_RSA2048_DIGEST_SIZE;
const u32 titlekey_size = sizeof(titlekey_buffer->titlekeys[0]);
if (is_personalized) {
se_rsa_exp_mod(0, curr_titlekey, block_size, curr_titlekey, block_size);
if (rsa_oaep_decode(curr_titlekey, titlekey_size, null_hash, sizeof(null_hash), curr_titlekey, block_size) != titlekey_size)
continue;
}
memcpy(titlekey_buffer->rights_ids[*titlekey_count], curr_ticket->rights_id, sizeof(titlekey_buffer->rights_ids[0]));
memcpy(titlekey_buffer->titlekeys[*titlekey_count], curr_titlekey, titlekey_size);
(*titlekey_count)++;
}
}