openssl x509 -in on.pem -text -noou

for f in *; do
if [ -f "$f" ]; then
openssl aes-256-cbc -in "$f" -out "${f}.enc" -k "pass"
fi
done

find . -type f -name "*.txt" -print0 | xargs -0 -I {} openssl enc -aes-256-cbc -in {} -out {}.enc -k pas