https://devzone.nordicsemi.com/f/nordic-q-a/125711/constant-time-memory-comparisonHi, I am looking for a constant-time memory comparison is a function that compares memory for equality in a fixed amount of time, regardless of the data&#39;s content. I am sure there is something is the encryption library but I am not able to find it.en-USTelligent Community 13Sat, 22 Nov 2025 23:14:05 GMThttps://devzone.nordicsemi.com/thread/555113?ContentTypeID=1Sat, 22 Nov 2025 23:14:05 GMT137ad170-7792-4731-bb38-c0d22fbe4515:dd26ec67-edce-4dc8-a739-da10b5bceda7BillyBobJoe<p>i will have look at this, thanks</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/555032?ContentTypeID=1Fri, 21 Nov 2025 11:28:11 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3ef3a00b-9cef-417f-97db-10cc164cbc50Benjamin<p>Hi,<br />I could not find anything in Zephyr. You can check the <a href="https://docs.nordicsemi.com/bundle/nrfxlib-apis-3.2.0-preview1/page/group_ocrypto_constant_time_ga040436f401c5de0e6562d2d67db75e43.html#ga040436f401c5de0e6562d2d67db75e43">ocrypto_constant_time_equal()&nbsp;</a>function in the Oberon crypto library, but it is probably better to write your own version.<br /><br />Regards,<br />Benjamin</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/554833?ContentTypeID=1Wed, 19 Nov 2025 16:56:10 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d1d89856-4240-4a99-ab5c-640d7b50846dBillyBobJoe<p>I have found a number of methods to write one but I assume there must be already in the Zephyr RTOS. ie&nbsp;<a href="https://github.com/chmike/cst_time_memcmp">github.com/.../cst_time_memcmp</a></p><div style="clear:both;"></div>