ssh-keygen -t rsa -C "shijianpeng@test.cn" -b 4096
openssl genrsa -out rsa_private_key.pem 2048
openssl rsa -in rsa_private_key.pem -pubout -out rsa_public_key_2048.pub
openssl pkcs8 -topk8 -inform PEM -in rsa_private_key.pem -outform PEM -nocrypt > rsa_private_key_pkcs8.pem
