Here you can find and sample on how to encrypt and decrypt content using OPENSSL. This sample goes with 3DES but it is valid for other chiphers. Notice the password will be requested to do the encryption.
- Encoding foo.txt
openssl enc -des3 -in foo.txt -out foo.3des
- Decoding foo.3des
openssl enc -d -des3 -in foo.3des -out bar.txt