openssl genrsa -out rsa_private_key.pem 3072 #生成私钥
openssl pkcs8 -topk8 -inform PEM -in rsa_private_key.pem -outform PEM -nocrypt -out rsa_private_key_pkcs8.pem #Java开发者需要将私钥转换成PKCS8格式
openssl rsa -in rsa_private_key.pem -pubout -out rsa_public_key.pem #生成公钥
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