重新根据pkcs8的秘钥创建公钥
rsa -in rsa_private_key_pkcs8.key -pubout -out rsa_public_key_pkcs8.pem
将OpenSSL的PKCS1转换成PKCS8的命令
pkcs8 -topk8 -inform PEM -in rsa_private_key.pem -outform pem -nocrypt -out rsa_private_key_pkcs8.pem