psa_kat_shim.c

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#include <stddef.h>
#include <stdint.h>
 
#include "mbedtls/platform_util.h"
#include "psa/crypto.h"

typedef enum : uint32_t {
  k_shim_lcg_mul   = 1664525U,    
  k_shim_lcg_add   = 1013904223U, 
  k_shim_seed      = 0x1234ABCDU, 
  k_shim_top_shift = 24U,         
} shim_const_t;
 
psa_status_t mbedtls_psa_external_get_random(mbedtls_psa_external_random_context_t* context,
                                             uint8_t*                               output,
                                             size_t                                 output_size,
                                             size_t*                                output_length)
{
  (void)context;
  static uint32_t s = (uint32_t)k_shim_seed;
  for (size_t i = 0U; i < output_size; ++i) {
    s         = (s * (uint32_t)k_shim_lcg_mul) + (uint32_t)k_shim_lcg_add;
    output[i] = (uint8_t)(s >> (uint32_t)k_shim_top_shift);
  }
  *output_length = output_size;
  return PSA_SUCCESS;
}
 
#if defined(MBEDTLS_HAVE_TIME) && defined(MBEDTLS_PLATFORM_MS_TIME_ALT)
mbedtls_ms_time_t mbedtls_ms_time(void)
{
  return 0;
}
#endif