Generate keys using openssl tool

OpenSSL> genrsa -out rsa_private_key.pem 1024 #Generate private key
OpenSSL> pkcs8 -topk8 -inform PEM -in rsa_private_key.pem -outform PEM -nocrypt -out rsa_private_key_pkcs8.pem #Java developers need to convert the private key to PKCS8 format
OpenSSL> rsa -in rsa_private_key.pem -pubout -out rsa_public_key.pem #生成公钥
OpenSSL> exit #Exit the OpenSSL program