text: /*
   * corePKCS11 V2.0.0
   * Copyright (C) 2020 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy of
   * this software and associated documentation files (the "Software"), to deal in
   * the Software without restriction, including without limitation the rights to
   * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
   * the Software, and to permit persons to whom the Software is furnished to do so,
   * subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in all
   * copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
   * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
   * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
   * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
   * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
   *
   * http://aws.amazon.com/freertos
   * http://www.FreeRTOS.org
   */
  
  /**
   * @file mbedtls_stubs.c
   * @brief Stubs for mbed TLS functions.
   */
  
  #include "mbedtls/entropy.h"
  #include "mbedtls/ctr_drbg.h"
  #include "mbedtls/threading.h"
  
  
  void mbedtls_entropy_init( mbedtls_entropy_context * ctx )
  {
      __CPROVER_assert( ctx != NULL, "Received an unexpected NULL pointer." );
  }
  
  void mbedtls_entropy_free( mbedtls_entropy_context * ctx )
  {
      __CPROVER_assert( ctx != NULL, "Received an unexpected NULL pointer." );
  }
  
  void mbedtls_ctr_drbg_init( mbedtls_ctr_drbg_context * ctx )
  {
      __CPROVER_assert( ctx != NULL, "Received an unexpected NULL pointer." );
  }
  
  int mbedtls_ctr_drbg_seed( mbedtls_ctr_drbg_context * ctx,
                             int ( * f_entropy )( void *, unsigned char *, size_t ),
                             void * p_entropy,
                             const unsigned char * custom,
                             size_t len )
  {
      __CPROVER_assert( ctx != NULL, "Received an unexpected NULL pointer." );
      __CPROVER_assert( f_entropy != NULL, "Received an unexpected NULL pointer." );
      __CPROVER_assert( p_entropy != NULL, "Received an unexpected NULL pointer." );
      return 0;
  }
  
  int mbedtls_ctr_drbg_random( void * p_rng,
                               unsigned char * output,
                               size_t output_len )
  {
      __CPROVER_assert( p_rng != NULL, "Received an unexpected NULL pointer." );
      __CPROVER_assert( output != NULL, "Received an unexpected NULL pointer." );
      return 0;
  }
  
  void mbedtls_ctr_drbg_free( mbedtls_ctr_drbg_context * ctx )
  {
      __CPROVER_assert( ctx != NULL, "Received an unexpected NULL pointer." );
  }
  
  static void threading_mutex_init( mbedtls_threading_mutex_t * mutex )
  {
      __CPROVER_assert( mutex != NULL, "Received an unexpected NULL pointer." );
  }
  
  static void threading_mutex_free( mbedtls_threading_mutex_t * mutex )
  {
      __CPROVER_assert( mutex != NULL, "Received an unexpected NULL pointer." );
  }
  
  
  static int threading_mutex_lock( mbedtls_threading_mutex_t * mutex )
  {
      __CPROVER_assert( mutex != NULL, "Received an unexpected NULL pointer." );
      return 0;
  }
  
  static int threading_mutex_unlock( mbedtls_threading_mutex_t * mutex )
  {
      __CPROVER_assert( mutex != NULL, "Received an unexpected NULL pointer." );
      return 0;
  }
  
  void (* mbedtls_mutex_init)( mbedtls_threading_mutex_t * ) = threading_mutex_init;
  void (* mbedtls_mutex_free)( mbedtls_threading_mutex_t * ) = threading_mutex_free;
  int (* mbedtls_mutex_lock)( mbedtls_threading_mutex_t * ) = threading_mutex_lock;
  int (* mbedtls_mutex_unlock)( mbedtls_threading_mutex_t * ) = threading_mutex_unlock;
  