MBEDTLS_SHADOW_KEY_KDF_MAX_LABEL_SIZE_IN_BYTES

#define MBEDTLS_SHADOW_KEY_KDF_MAX_LABEL_SIZE_IN_BYTES   (64)

#include <crypto/nrf_cc310_mbedcrypto/include/mbedtls/cc3xx_kmu.h>

KDF input "label" can be 0 to 64 bytes.