https://devzone.nordicsemi.com/f/nordic-q-a/78713/how-do-i-encrypt-a-stringHello. We are developing using nrf52832 (S132 v7.0.1, SDK v17.0.0). I&#39;m looking at how to encrypt a string with AES CBC. Below is the code we are considering. Currently, it works, but the strings are not encrypted and are all &quot;0x00&quot;. How can I solveen-USTelligent Community 13Mon, 30 Aug 2021 10:27:19 GMThttps://devzone.nordicsemi.com/thread/327164?ContentTypeID=1Mon, 30 Aug 2021 10:27:19 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e384f397-e685-4e5e-99f6-1de36c53866aCarl Richard<p>Hello again!<br /><br />Good to hear. You must pad any input data shorter than 16 bytes. I.e, add empty bytes at the end of the array.<br /><br />Best regards,<br />Carl Richard</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/326875?ContentTypeID=1Fri, 27 Aug 2021 05:34:56 GMT137ad170-7792-4731-bb38-c0d22fbe4515:66379a91-02e6-4af6-a358-a830bce2a140sdi_kei<p>Hello!</p> <p>I changed the backend from CC310 to mbed TLS and now I can encrypt and decrypt!<br />Thank you!</p> <p>One question is that m_plain_text must be a multiple of 16 bytes. Is there a way to encrypt 15 byte characters?</p> <p><span>Best regards.</span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/326114?ContentTypeID=1Mon, 23 Aug 2021 07:49:18 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7e8da802-0e20-4fde-b18b-8ba2f2f4e213Carl Richard<p>Hello!<br /><br />You must use a different backend, as the CryptoCell peripheral (CC310) isn&#39;t available on the nRF52832.&nbsp;Please check out the <a href="https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.0.2/lib_crypto_config.html">documentation for configuring nrf_crypto backends.<br /></a><br />Best regards,<br />Carl Richard</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/326075?ContentTypeID=1Mon, 23 Aug 2021 04:36:53 GMT137ad170-7792-4731-bb38-c0d22fbe4515:146e6fea-ed0e-47b2-814b-a004d656709csdi_kei<p><span>Hello,</span><span>Carl Richard!</span></p> <p>When I checked the location of the PC, it was in SaSi_AesFinish on line 495 of cc310_backend_aes.c.</p> <p>Best regards.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/326008?ContentTypeID=1Fri, 20 Aug 2021 15:02:14 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3ff3efe3-4f22-4928-add2-e5ecd43434b7Carl Richard<p>Hello again!<br /><br />This means that the program crashed somehow. Are you able to check where in the code Program Counter (PC) stopped?<br /><br />Best regards,<br />Carl Richard</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/325826?ContentTypeID=1Fri, 20 Aug 2021 05:40:28 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8a815a51-c60d-4d42-9d00-8b84f9416883sdi_kei<p>Hello,<span>Carl Richard!</span></p> <p>Thank you for teaching.<br />When I changed the character length of m_plain_text to 64, the 0x8511 error disappeared.</p> <p>However, HardFault_Handler started to occur.<br />The condition that occurs is when you call nrf_crypto_aes_finalize.</p> <p><span>The debugger shows &quot;Exception occurred at PC = 0x39602, LR = 0x395d3&quot;.</span><br />How can I solve it?</p> <p><span>Best Regards.</span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/325763?ContentTypeID=1Thu, 19 Aug 2021 13:31:44 GMT137ad170-7792-4731-bb38-c0d22fbe4515:620f629b-e172-4150-a0ad-d68298ed37eaCarl Richard<p>Hello, sdi_kei!<br /><br />There seems to be an issue with the input length of your plain text string. With nrf_crypto_aes the input must be a multiple of 16 bytes, so you must pad the input data.<br /><br />Best regards,<br />Carl Richard</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/325712?ContentTypeID=1Thu, 19 Aug 2021 11:45:26 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c57b62ec-a4c3-41ad-b000-2dbb463a098esdi_kei<p>Hello.</p> <p>I got a 0x8511 error when calling nrf_crypto_aes_finalize. I don&#39;t know which part is wrong. I would like you to tell me.</p> <p><span>Best Regards.</span></p><div style="clear:both;"></div>