Help¶

Use a SHA-256 implementation with smaller footprint. Note, that this implementation will also have a lower performance. On a Cortex-M4 the size of mbedtls_sha256_process() will be reduced from ~2KB to ~0.5KB, however it will also perform around 30% slower. MBEDTLS_SHA256_SMALLER setting in mbed TLS config file.

Direct dependencies¶

NRF_SECURITY_ADVANCED && (VANILLA_MBEDTLS_SHA256_C || (MBEDTLS_SHA256_C && !NRF_CRYPTO_BACKEND_COMBINATION_0)) && NRF_SECURITY_ADVANCED && MBEDTLS_VANILLA_BACKEND && NORDIC_SECURITY_BACKEND

(Includes any dependencies from ifs and menus.)

Defaults¶

No defaults. Implicitly defaults to n.

Kconfig definition¶

At nrf_security/Kconfig:887

Included via /jenkins_workspace/workspace/nrfconnect-nrf_doc_v1.2-branch_2/nrfxlib/Kconfig.nrfxlib:14

Menu path: (Top) → Nordic nrfxlib → Nordic Security → Use Nordic provided security backend → Advanced mbed TLS Configuration Settings

config MBEDTLS_SHA256_SMALLER
    bool "Use SHA256 small footprint implementation"
    depends on NRF_SECURITY_ADVANCED && (VANILLA_MBEDTLS_SHA256_C || (MBEDTLS_SHA256_C && !NRF_CRYPTO_BACKEND_COMBINATION_0)) && NRF_SECURITY_ADVANCED && MBEDTLS_VANILLA_BACKEND && NORDIC_SECURITY_BACKEND
    help
      Use a SHA-256 implementation with smaller footprint.
      Note, that this implementation will also have a lower performance.
      On a Cortex-M4 the size of mbedtls_sha256_process() will be reduced from ~2KB to ~0.5KB,
      however it will also perform around 30% slower.
      MBEDTLS_SHA256_SMALLER setting in mbed TLS config file.

(The ‘depends on’ condition includes propagated dependencies from ifs and menus.)