生成PKCS1格式私钥(PHP使用)
openssl genrsa -out rsa_private_key.pem 2048
PKCS1格式私钥转换为PKCS8格式私钥(Java及Python使用)
openssl pkcs8 -topk8 -inform PEM -in rsa_private_key.pem -outform PEM -nocrypt > rsa_private_key.txt
生成RSA公钥
openssl rsa -in rsa_private_key.pem -pubout -out rsa_public_key.pem