An upcoming release of macOS will update the openssl tool, and If you are using the method documented in https://github.com/brysontyrrell/EncryptedStrings/blob/master/EncryptedStrings_Bash.sh to obfuscate the user name and password for calls to the Jamf Pro Classic API it will require modification to work with the new version.
The modification is to specify that the md5 message digest is to be used by adding the "-md md5" option to the openssl "enc" command (e.g. openssl enc -aes256... becomes openssl enc -aes256 -md md5...). Adding that will allow your API calls to work with current and upcoming versions of macOS.
Thanks to @frogor on MacAdmins Slack for posting this fix.