openssl로 aes key 생성하기

128-bit key 생성

openssl enc -aes-128-cbc -k secret -P -md sha1

192-bit key 생성

openssl enc -aes-192-cbc -k secret -P -md sha1

256-bit key 생성

openssl enc -aes-256-cbc -k secret -P -md sha1