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I take it you took the command from here, but you don't really know what's going on: http://blog.chmouel.com/2007/08/17/generating-md5-encrypted-password-for-chpasswd/
Your description needs to be updated. You mention to generate secure passwords with 'chpasswd', but you're using openssl to create the hash. Then, with that hash, you could have explained how to use it with chpasswd, but you didn't. So, I'll do it for you:
echo "test:$(echo password | openssl passwd -1 -stdin -salt abcde)" | sudo chpasswd -e