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       1                 :            : /*
       2                 :            :    Copyright (c) 2022 Eriptic Technologies. See the COPYRIGHT
       3                 :            :    file at the top-level directory of this distribution.
       4                 :            : 
       5                 :            :    Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
       6                 :            :    http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
       7                 :            :    <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
       8                 :            :    option. This file may not be copied, modified, or distributed
       9                 :            :    except according to those terms.
      10                 :            : */
      11                 :            : #include <inttypes.h>
      12                 :            : 
      13                 :            : #include "edhoc.h"
      14                 :            : #include "oscore.h"
      15                 :            : 
      16                 :            : #include "common/oscore_edhoc_error.h"
      17                 :            : #include "common/print_util.h"
      18                 :            : 
      19                 :            : #ifdef OSCORE_NVM_SUPPORT
      20                 :          0 : enum err WEAK nvm_write_ssn(const struct nvm_key_t *nvm_key, uint64_t ssn)
      21                 :            : {
      22                 :          0 :         PRINT_MSG(
      23                 :            :                 "The nvm_write_ssn() function MUST be overwritten by user!!!\n");
      24                 :          0 :         return not_implemented;
      25                 :            : }
      26                 :            : 
      27                 :          0 : enum err WEAK nvm_read_ssn(const struct nvm_key_t *nvm_key, uint64_t *ssn)
      28                 :            : {
      29                 :          0 :         PRINT_MSG(
      30                 :            :                 "The nvm_read_ssn() function MUST be overwritten by user!!!\n");
      31         [ #  # ]:          0 :         if (NULL != ssn) {
      32                 :          0 :                 *ssn = 0;
      33                 :            :         }
      34                 :          0 :         return not_implemented;
      35                 :            : }
      36                 :            : 
      37                 :          9 : enum err ssn_store_in_nvm(const struct nvm_key_t *nvm_key, uint64_t ssn,
      38                 :            :                           bool echo_sync_in_progress)
      39                 :            : {
      40                 :          9 :         bool cyclic_write = (0 == ssn % K_SSN_NVM_STORE_INTERVAL);
      41                 :            : 
      42                 :            :         /* While the device is still in the ECHO synchronization mode (after device reboot or other context reinitialization)
      43                 :            :            SSN has to be written immediately, in case of uncontrolled reboot before first cyclic write happens. */
      44   [ +  -  +  - ]:          9 :         if (cyclic_write || echo_sync_in_progress) {
      45         [ -  + ]:          9 :                 TRY(nvm_write_ssn(nvm_key, ssn));
      46                 :            :         }
      47                 :          9 :         return ok;
      48                 :            : }
      49                 :            : #endif
      50                 :            : 
      51                 :         11 : enum err ssn_init(const struct nvm_key_t *nvm_key, uint64_t *ssn,
      52                 :            :                   bool is_context_fresh)
      53                 :            : {
      54   [ +  -  -  + ]:         11 :         if ((NULL == nvm_key) || (NULL == ssn)) {
      55                 :          0 :                 return wrong_parameter;
      56                 :            :         }
      57                 :            : 
      58         [ +  + ]:         11 :         if (is_context_fresh) {
      59                 :          8 :                 *ssn = 0;
      60                 :          8 :                 PRINTF("Security context is fresh, SSN initialized to %" PRIu64
      61                 :            :                        "\n",
      62                 :            :                        *ssn);
      63                 :            :         } else {
      64                 :            :                 #ifdef OSCORE_NVM_SUPPORT
      65         [ -  + ]:          3 :                         TRY(nvm_read_ssn(nvm_key, ssn));
      66                 :          3 :                         *ssn += K_SSN_NVM_STORE_INTERVAL + F_NVM_MAX_WRITE_FAILURE;
      67                 :          3 :                         PRINTF("SSN initialized from NMV. SSN = %" PRIu64 "\n", *ssn);
      68                 :            :                 #else
      69                 :            :                         PRINT_MSG("OSCORE_NVM_SUPPORT flag must be defined for handling non-fresh (stored) contexts.");
      70                 :            :                         return not_implemented;
      71                 :            :                 #endif
      72                 :            :         }
      73                 :         11 :         return ok;
      74                 :            : }