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Implement smcExpMod.

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This commit is contained in:
Michael Scire 2018-02-19 20:56:12 -08:00
parent 9b54bc536b
commit f1c521a5d6
4 changed files with 87 additions and 3 deletions
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64
exosphere/smc_user.c
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@ -9,6 +9,64 @@
/* Globals. */
int g_crypt_aes_done = 0;
int g_exp_mod_done = 0;
void set_exp_mod_done(int done) {
g_exp_mod_done = done & 1;
}
int get_exp_mod_done(void) {
return g_exp_mod_done;
}
uint32_t exp_mod_done_handler(void) {
set_exp_mod_done(1);
se_trigger_interrupt();
return 0;
}
uint32_t user_exp_mod(smc_args_t *args) {
uint8_t modulus[0x100];
uint8_t exponent[0x100];
uint8_t input[0x100];
upage_ref_t page_ref;
/* Validate size. */
if (args->X[4] == 0 || args->X[4] > 0x100 || (args->X[4] & 3) != 0) {
return 2;
}
size_t exponent_size = (size_t)args->X[4];
void *user_input = (void *)args->X[1];
void *user_exponent = (void *)args->X[2];
void *user_modulus = (void *)args->X[3];
/* Copy user data into secure memory. */
if (upage_init(&page_ref, user_input) == 0) {
return 2;
}
if (user_copy_to_secure(&page_ref, input, user_input, 0x100) == 0) {
return 2;
}
if (user_copy_to_secure(&page_ref, exponent, user_exponent, exponent_size) == 0) {
return 2;
}
if (user_copy_to_secure(&page_ref, modulus, user_modulus, 0x100) == 0) {
return 2;
}
set_exp_mod_done(0);
/* Hardcode RSA keyslot 0. */
set_rsa_keyslot(0, modulus, 0x100, exponent, exponent_size);
se_exp_mod(0, input, 0x100, exp_mod_done_handler);
return 0;
}
uint32_t user_load_aes_key(smc_args_t *args) {
uint64_t sealed_kek[2];
@ -47,7 +105,9 @@ uint32_t crypt_aes_done_handler(void) {
set_crypt_aes_done(1);
/* TODO: Manually trigger an SE interrupt (0x2C) */
se_trigger_interrupt();
return 0;
}
uint32_t user_crypt_aes(smc_args_t *args) {
@ -105,7 +165,7 @@ uint32_t user_compute_cmac(smc_args_t *args) {
return 2;
}
if (upage_init(&page_ref, (void *)user_address) == 0 || user_copy_to_secure(&page_ref, user_data, user_address, size) == 0) {
if (upage_init(&page_ref, user_address) == 0 || user_copy_to_secure(&page_ref, user_data, user_address, size) == 0) {
return 2;
}