How to make an OpenSSL key that is AES256 Encrypted

[root@host CA]# openssl dsaparam -out dsaparam.pem 2048
Generating DSA parameters, 2048 bit long prime
This could take some time
..........+.+..+.......+..................+..+.............+......+.........+........+.+.........+..+...........+...................+.+....................................................+++++++++++++++++++++++++++++++++++++++++++++++++++*
........+........+............+.+...........+..+.+...................+........+....+.....+........................+..+........+.....+............................................+................+..........+..........+.......+.........+..+.+.....+...........................+.......+........+..........+...................+.......+...+.+..............................+...+.+++++++++++++++++++++++++++++++++++++++++++++++++++*
[root@host CA]# openssl gendsa -aes256 -out pete.key dsaparam.pem
Generating DSA key, 2048 bits
Enter PEM pass phrase:
Verifying - Enter PEM pass phrase:
[root@host CA]#