openssl生成公钥私钥

生成RSA私钥
[root@localhost ]# openssl genrsa -out rsa_private_key.pem 1024
Generating RSA private key, 1024 bit long modulus
...................................................++++++
................................++++++
e is 65537 (0x10001)

把RSA私钥转换成PKCS8格式
[root@localhost ]# openssl pkcs8 -topk8 -inform PEM -in rsa_private_key.pem -outform PEM -nocrypt >>PKCS8
-----BEGIN PRIVATE KEY-----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-----END PRIVATE KEY-----

生成公钥
[root@localhost ]# openssl rsa -in rsa_private_key.pem -pubout -out rsa_public_key.pem
writing RSA key


[root@localhost 1]# ls -1
PKCS8 #PKCS8格式的私钥，从RSA私钥来的
rsa_private_key.pem #RSA私钥
rsa_public_key.pem #RSA公钥