https://devzone.nordicsemi.com/f/nordic-q-a/39832/crypto-engineHello, I would like to use the hardware crypto engine that is a part of nRF52832 chipset. I understand that the access to it is restricted as SoftDevice uses it. I wonder though whether I can freely access it if I don&#39;t use security layer of BLE stacken-USTelligent Community 13Fri, 26 Oct 2018 06:38:31 GMThttps://devzone.nordicsemi.com/thread/154605?ContentTypeID=1Fri, 26 Oct 2018 06:38:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3a74968c-078a-4671-8ef1-2c1b811f7276BarbaraTurner<p>Thank you Einar</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/154452?ContentTypeID=1Thu, 25 Oct 2018 10:46:10 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0dde69fe-6922-49ee-a627-028a8f356ca2Einar Thorsrud<p>Hi Barbara,</p> <p></p> <p>As you can see from <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.s132.sds/dita/softdevices/s130/sd_resource_reqs/hw_block_interrupt_vector.html?cp=2_3_1_0_6_0">Table 2. Peripheral protection and usage by SoftDevice</a>, the <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/ccm.html?cp=2_1_0_28#topic">AES CCM peripheral</a> is blocked by the SoftDevice and cannot be used while it is enabled. This is regardless of whether it is in a encrypted BLE connection or not. The <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/ecb.html?cp=2_1_0_27#concept_vnj_kgy_xr">AES ECB peripheral</a> on the other hand is <em>restricted</em>, which means that it can only be used via the SoftDevice APIs. Therefore you have to use <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.s132.api.v6.1.0/group___n_r_f___s_o_c___f_u_n_c_t_i_o_n_s.html#ga79280d697e7ba03810c6473b0c7dab87">sd_ecb_block_encrypt()</a>&nbsp;or <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.s132.api.v6.1.0/group___n_r_f___s_o_c___f_u_n_c_t_i_o_n_s.html#ga30cc707e7aa4a73019fae00f8b4faa52">sd_ecb_blocks_encrypt()</a>&nbsp;instead of accessing the ECB HW registers directly.</p> <p>Einar</p><div style="clear:both;"></div>