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Example SMC implementation (load_aes_key)

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This commit is contained in:
Michael Scire 2018-02-17 16:34:31 -08:00
parent 49e1e6f41e
commit 5c24f58402
3 changed files with 98 additions and 3 deletions
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49
exosphere/smc_api.c
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@ -2,6 +2,7 @@
#include "utils.h"
#include "smc_api.h"
#include "smc_user.h"
#include "se.h"
#define SMC_USER_HANDLERS 0x13
@ -93,10 +94,10 @@ smc_table_t g_smc_tables[2] = {
};
int g_is_smc_in_progress = 0;
uint32_t (*g_smc_callback)(uint64_t, uint64_t) = NULL;
uint32_t (*g_smc_callback)(void *, uint64_t) = NULL;
uint64_t g_smc_callback_key = 0;
uint64_t try_set_smc_callback(uint32_t (*callback)(uint64_t, uint64_t)) {
uint64_t try_set_smc_callback(uint32_t (*callback)(void *, uint64_t)) {
uint64_t key;
/* TODO: Atomics... */
if (g_smc_callback_key) {
@ -158,7 +159,7 @@ uint32_t smc_wrapper_sync(smc_args_t *args, uint32_t (*handler)(smc_args_t *)) {
return result;
}
uint32_t smc_wrapper_async(smc_args_t *args, uint32_t (*handler)(smc_args_t *), uint32_t (*callback)(uint64_t, uint64_t)) {
uint32_t smc_wrapper_async(smc_args_t *args, uint32_t (*handler)(smc_args_t *), uint32_t (*callback)(void *, uint64_t)) {
uint32_t result;
uint64_t key;
/* TODO: Make g_is_smc_in_progress atomic. */
@ -181,4 +182,46 @@ uint32_t smc_wrapper_async(smc_args_t *args, uint32_t (*handler)(smc_args_t *),
}
g_is_smc_in_progress = 0;
return result;
}
uint32_t smc_check_status(smc_args_t *args) {
if (g_smc_callback_key == 0) {
return 4;
}
if (args->X[1] != g_smc_callback_key) {
return 5;
}
args->X[1] = g_smc_callback(NULL, 0);
g_smc_callback_key = 0;
return 0;
}
uint32_t smc_get_result(smc_args_t *) {
uint32_t status;
unsigned char result_buf[0x400];
if (g_smc_callback_key == 0) {
return 4;
}
if (args->X[1] != g_smc_callback_key) {
return 5;
}
/* Check result size */
if (args->X[3] > 0x400) {
return 2;
}
args->X[1] = g_smc_callback(result_buf, args->X[3]);
g_smc_callback_key = 0;
/* TODO: Copy result from result_buf into output in args->X[2] */
return 0;
}
uint32_t smc_load_aes_key(smc_args_t *args) {
smc_wrapper_sync(args, user_load_aes_key);
}

31
exosphere/smc_user.c Normal file
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@ -0,0 +1,31 @@
#include <stdint.h>
#include "utils.h"
#include "smc_api.h"
#include "smc_user.h"
#include "se.h"
uint32_t user_load_aes_key(smc_args_t *args) {
unsigned char sealed_kek[0x10];
unsigned char wrapped_key[0x10];
uint64_t *p_sealed_kek = (uint64_t *)(&sealed_kek[0]);
uint64_t *p_wrapped_key = (uint64_t *)(&wrapped_key[0]);
uint32_t keyslot = (uint32_t)args->X[1];
if (keyslot > 3) {
return 2;
}
/* Copy keydata */
p_sealed_kek[0] = args->X[2];
p_sealed_kek[1] = args->X[3];
p_wrapped_key[0] = args->X[4];
p_wrapped_key[1] = args->X[5];
/* TODO: Unseal the kek. */
set_aes_keyslot(9, sealed_kek, 0x10);
/* Unwrap the key. */
decrypt_data_into_keyslot(keyslot, 9, wrapped_key, 0x10);
return 0;
}

21
exosphere/smc_user.h Normal file
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@ -0,0 +1,21 @@
#ifndef EXOSPHERE_SMC_USER_H
#define EXOSPHERE_SMC_USER_H
#include "smc_api.h"
uint32_t user_exp_mod(smc_args_t *args);
uint32_t user_get_random_bytes(smc_args_t *args);
uint32_t user_generate_aes_kek(smc_args_t *args);
uint32_t user_load_aes_key(smc_args_t *args);
uint32_t user_crypt_aes(smc_args_t *args);
uint32_t user_generate_specific_aes_key(smc_args_t *args);
uint32_t user_compute_cmac(smc_args_t *args);
uint32_t user_load_rsa_private_key(smc_args_t *args);
uint32_t user_decrypt_rsa_private_key(smc_args_t *args);
uint32_t user_load_rsa_oaep_key(smc_args_t *args);
uint32_t user_rsa_oaep(smc_args_t *args);
uint32_t user_unwrap_rsa_wrapped_titlekey(smc_args_t *args);
uint32_t user_load_titlekey(smc_args_t *args);
uint32_t user_unwrap_aes_wrapped_titlekey(smc_args_t *args);
#endif