ifneq (,$(filter mbedtls_entropy,$(USEMODULE)))
  USEMODULE += mbedtls_contrib
  USEMODULE += hashes

  FEATURES_REQUIRED_ANY += periph_adc|periph_hwrng

  # include sources if hardware is available
  FEATURES_OPTIONAL += periph_hwrng
  ifneq (,$(filter periph_hwrng,$(FEATURES_USED)))
    DEFAULT_MODULE += mbedtls_entropy_source_hwrng
  endif

  FEATURES_OPTIONAL += periph_adc
  ifneq (,$(filter periph_adc,$(FEATURES_USED)))
    DEFAULT_MODULE += mbedtls_entropy_source_adc
  endif

  ifneq (,$(filter mbedtls_entropy_source_adc,$(USEMODULE) $(DEFAULT_MODULE)))
    USEMODULE += entropy_source_adc_noise
  endif
endif