Openssl gendsa命令

openssl gendsa [-out filename] [-passout out] [-rand file(s)] [-engine id] [paramfile] [-des] [-des3] [-idea]

-out file - output the key to 'file'
-des      - encrypt the generated key with DES in cbc mode
-des3     - encrypt the generated key with DES in ede cbc mode (168 bit key)
-idea     - encrypt the generated key with IDEA in cbc mode
-seed
encrypt PEM output with cbc seed
-aes128, -aes192, -aes256
encrypt PEM output with cbc aes
-camellia128, -camellia192, -camellia256
encrypt PEM output with cbc camellia
-engine e - use engine e, possibly a hardware device.
-rand file:file:...
- load the file (or the files in the directory) into
the random number generator
dsaparam-file
- a DSA parameter file as generated by the dsaparam command

openssl gendsa -des3 -out encdsa.pem dsaparam.pem

参考：http://blog.csdn.net/as3luyuan123/article/details/14498289