From d3d65f4800d8fe0084e645744f8b16524cfc6016 Mon Sep 17 00:00:00 2001 From: Michael Scire Date: Tue, 20 Feb 2018 13:25:57 -0800 Subject: [PATCH] smcGenerateSpecificAesKey, smcLoadRsaPrivateKey, smcLoadRsaOaepKey --- exosphere/smc_api.c | 12 ++++ exosphere/smc_user.c | 155 ++++++++++++++++++++++++++++++++++++++++++- 2 files changed, 166 insertions(+), 1 deletion(-) diff --git a/exosphere/smc_api.c b/exosphere/smc_api.c index 8afc3170e..5cbc9ec1d 100644 --- a/exosphere/smc_api.c +++ b/exosphere/smc_api.c @@ -305,14 +305,26 @@ 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_generate_specific_aes_key(smc_args_t *args) { + return smc_wrapper_sync(args, user_generate_specific_aes_key); +} + uint32_t smc_compute_cmac(smc_args_t *args) { return smc_wrapper_sync(args, user_compute_cmac); } +uint32_t smc_load_rsa_private_key(smc_args_t *args) { + return smc_wrapper_sync(args, user_load_rsa_private_key); +} + uint32_t smc_decrypt_rsa_private_key(smc_args_t *args) { return smc_wrapper_sync(args, user_decrypt_rsa_private_key); } +uint32_t smc_load_rsa_oaep_key(smc_args_t *args) { + return smc_wrapper_sync(args, user_load_rsa_oaep_key); +} + uint32_t smc_rsa_oaep(smc_args_t *args) { return smc_wrapper_async(args, user_rsa_oaep, smc_exp_mod_get_result); } diff --git a/exosphere/smc_user.c b/exosphere/smc_user.c index 234aa1903..d05a7997a 100644 --- a/exosphere/smc_user.c +++ b/exosphere/smc_user.c @@ -268,6 +268,65 @@ uint32_t user_crypt_aes(smc_args_t *args) { return result; } +uint32_t user_generate_specific_aes_key(smc_args_t *args) { + uint64_t wrapped_key[2]; + uint8_t key[0x10]; + unsigned int master_key_rev; + int should_mask; + + wrapped_key[0] = args->X[1]; + wrapped_key[1] = args->X[2]; + if (args->X[4] > MASTERKEY_REVISION_MAX) { + return 2; + } + master_key_rev = (unsigned int)(args->X[4]); + if (args->X[3] > 1) { + return 2; + } + should_mask = (int)(args->X[3]); + + unsigned int keyslot; + + /* Behavior changed in 4.0.0. */ + if (mkey_get_revision() >= 4) { + if (master_key_rev >= 2) { + keyslot = KEYSLOT_SWITCH_DEVICEKEY; /* New device key, 4.x. */ + } else { + keyslot = KEYSLOT_SWITCH_4XOLDDEVICEKEY; /* Old device key, 4.x. */ + } + } else { + keyslot = KEYSLOT_SWITCH_DEVICEKEY; + } + + if (0 /* TODO: GET_BOOTROM_PATCH_VERSION < 0x7F */) { + /* On dev units, use a fixed "all-zeroes" seed. */ + /* Yes, this data really is all-zero in actual TrustZone .rodata. */ + uint8_t dev_specific_aes_key_source[0x10] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}; + uint8_t dev_specific_aes_key_ctr[0x10] = {0x3C, 0xD5, 0x92, 0xEC, 0x68, 0x31, 0x4A, 0x06, 0xD4, 0x1B, 0x0C, 0xD9, 0xF6, 0x2E, 0xD9, 0xE9}; + uint8_t dev_specific_aes_key_mask[0x10] = {0xAC, 0xCA, 0x9A, 0xCA, 0xFF, 0x2E, 0xB9, 0x22, 0xCC, 0x1F, 0x4F, 0xAD, 0xDD, 0x77, 0x21, 0x1E}; + + cache_flush(key, key + 0x10); + se_aes_ctr_crypt(keyslot, key, 0x10, dev_specific_aes_key_source, 0x10, dev_specific_aes_key_ctr, 0x10); + cache_flush(key, key + 0x10); + + if (should_mask) { + for (unsigned int i = 0; i < 0x10; i++) { + key[i] ^= dev_specific_aes_key_mask[i]; + } + } + } else { + /* On retail, standard kek->key decryption. */ + uint8_t retail_specific_aes_key_source[0x10] = {0xE2, 0xD6, 0xB8, 0x7A, 0x11, 0x9C, 0xB8, 0x80, 0xE8, 0x22, 0x88, 0x8A, 0x46, 0xFB, 0xA1, 0x95}; + decrypt_data_into_keyslot(KEYSLOT_SWITCH_TEMPKEY, keyslot, retail_specific_aes_key_source, 0x10); + se_aes_ecb_decrypt_block(KEYSLOT_SWITCH_TEMPKEY, key, 0x10, wrapped_key, 0x10); + } + + + args->X[1] = key[0]; + args->X[2] = key[1]; + return 0; +} + uint32_t user_compute_cmac(smc_args_t *args) { uint32_t keyslot = (uint32_t)args->X[1]; void *user_address = (void *)args->X[2]; @@ -296,6 +355,49 @@ uint32_t user_compute_cmac(smc_args_t *args) { return 0; } +uint32_t user_load_rsa_private_key(smc_args_t *args) { + uint64_t sealed_kek[2]; + uint64_t wrapped_key[2]; + int is_personalized; + + uint8_t user_data[0x400]; + void *user_address; + size_t size; + upage_ref_t page_ref; + + + /* Copy keydata */ + sealed_kek[0] = args->X[1]; + sealed_kek[1] = args->X[2]; + if (args->X[3] > 1) { + return 2; + } + is_personalized = (int)args->X[3]; + user_address = (void *)args->X[4]; + size = = (size_t)args->X[5]; + wrapped_key[0] = args->X[6]; + wrapped_key[1] = args->X[7]; + + if (is_personalized && size != 0x240) { + return 2; + } + if (!is_personalized && (size != 0x220 /* TODO: || GET_BOOTROM_PATCH_VERSION >= 0x7F */)) { + return 2; + } + + if (upage_init(&page_ref, user_address) == 0 || user_copy_to_secure(&page_ref, user_data, user_address, size) == 0) { + return 2; + } + + /* Ensure that our private key is 0x100 bytes. */ + if (gcm_decrypt_key(user_data, size, user_data, size, sealed_kek, 0x10, wrapped_key, 0x10, CRYPTOUSECASE_RSATICKET, is_personalized) < 0x100) { + return 2; + } + + memcpy(g_rsa_private_exponent, user_data, 0x100); + return 0; +} + uint32_t user_decrypt_rsa_private_key(smc_args_t *args) { uint64_t sealed_kek[2]; uint64_t wrapped_key[2]; @@ -326,7 +428,7 @@ uint32_t user_decrypt_rsa_private_key(smc_args_t *args) { if (is_personalized && size < 0x31) { return 2; } - if (!is_personalized && (size < 0x11 /* || GET_BOOTROM_PATCH_VERSION >= 0x7F */)) { + if (!is_personalized && (size < 0x11 /* TODO: || GET_BOOTROM_PATCH_VERSION >= 0x7F */)) { return 2; } @@ -348,6 +450,57 @@ uint32_t user_decrypt_rsa_private_key(smc_args_t *args) { return 0; } +uint32_t user_load_rsa_oaep_key(smc_args_t *args) { + uint64_t sealed_kek[2]; + uint64_t wrapped_key[2]; + int is_personalized; + + uint8_t user_data[0x400]; + void *user_address; + size_t size; + upage_ref_t page_ref; + + + /* Copy keydata */ + sealed_kek[0] = args->X[1]; + sealed_kek[1] = args->X[2]; + if (args->X[3] > 1) { + return 2; + } + is_personalized = (int)args->X[3]; + user_address = (void *)args->X[4]; + size = = (size_t)args->X[5]; + wrapped_key[0] = args->X[6]; + wrapped_key[1] = args->X[7]; + + if (is_personalized && size != 0x130) { + return 2; + } + if (!is_personalized && (size != 0x110 /* TODO: || GET_BOOTROM_PATCH_VERSION >= 0x7F */)) { + return 2; + } + + if (upage_init(&page_ref, user_address) == 0 || user_copy_to_secure(&page_ref, user_data, user_address, size) == 0) { + return 2; + } + + size_t out_size; + + /* Ensure that our key is non-zero bytes. */ + if ((out_size = gcm_decrypt_key(user_data, size, user_data, size, sealed_kek, 0x10, wrapped_key, 0x10, CRYPTOUSECASE_RSAOAEP, is_personalized)) == 0) { + return 2; + } + + /* Copy key to global. */ + if (out_size <= 0x100) { + memcpy(g_rsa_oaep_exponent, user_data, out_size); + } else { + memcpy(g_rsa_oaep_exponent, user_data, 0x100); + } + + return 0; +} + uint32_t user_rsa_oaep(smc_args_t *args) { uint8_t modulus[0x100]; uint8_t input[0x100];