PSA_KEY_DERIVATION_INPUT_SECRET macro

A secret input for key derivation. This should be a key of type #PSA_KEY_TYPE_DERIVE (passed to psa_key_derivation_input_key()) or the shared secret resulting from a key agreement (obtained via psa_key_derivation_key_agreement()). The secret can also be a direct input (passed to key_derivation_input_bytes()). In this case, the derivation operation may not be used to derive keys: the operation will only allow psa_key_derivation_output_bytes(), psa_key_derivation_verify_bytes(), or psa_key_derivation_verify_key(), but not psa_key_derivation_output_key().