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smcComputeCmac implementation.

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This commit is contained in:
Michael Scire 2018-02-19 20:28:37 -08:00
parent ff07451280
commit 0340085c67
2 changed files with 34 additions and 0 deletions
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4
exosphere/smc_api.c
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@ -277,6 +277,10 @@ uint32_t smc_crypt_aes(smc_args_t *args) {
return smc_wrapper_async(args, user_crypt_aes, smc_crypt_aes_status_check);
}
uint32_t smc_compute_cmac(smc_args_t *args) {
return smc_wrapper_sync(args, user_compute_cmac);
}
uint32_t smc_cpu_on(smc_args_t *args) {

30
exosphere/smc_user.c
View file

@ -1,9 +1,11 @@
#include <stdint.h>
#include "utils.h"
#include "cache.h"
#include "smc_api.h"
#include "smc_user.h"
#include "se.h"
#include "userpage.h"
/* Globals. */
int g_crypt_aes_done = 0;
@ -88,3 +90,31 @@ uint32_t user_crypt_aes(smc_args_t *args) {
return result;
}
uint32_t user_compute_cmac(smc_args_t *args) {
uint32_t keyslot = (uint32_t)args->X[1];
void *user_address = (void *)args->X[2];
size_t size = (size_t)args->X[3];
uint8_t user_data[0x400];
uint64_t result_cmac[2];
upage_ref_t page_ref;
/* Validate keyslot and size. */
if (keyslot > 3 || args->X[3] > 0x400) {
return 2;
}
if (upage_init(&page_ref, (void *)user_address) == 0 || user_copy_to_secure() == 0) {
return 2;
}
flush_dcache_range(user_data, user_data + size);
se_compute_aes_128_cmac(keyslot, result_cmac, 0x10, user_data, size);
/* Copy CMAC out. */
args->X[1] = result_cmac[0];
args->X[2] = result_cmac[1];
return 0;
}