Chu's Space

openssl genrsa -aes256 -out chun.pro-encrypted.key 2048 -sha256  

openssl rsa -in chun.pro-encrypted.key -out chun.pro-decrypted.key 

openssl req -new -key chun.pro-decrypted.key -out chun.pro.csr

参考资料：
1.http://www-01.ibm.com/support/knowledgecenter/SSBM85_9.0.0/com.ibm.tivoli.tem.doc_9.0/SUA_9.0/com.ibm.license.mgmt.doc/security/t_generate_certificate_CA.html?lang=zh
2.http://blog.csdn.net/zzxian/article/details/7739673