生成私鑰
[dev@localhost tmp]$ openssl genrsa -out rsa_private_key.pem 2048
Generating RSA private key, 2048 bit long modulus
..........+++
.....................................................................................+++
e is 65537 (0x10001)
[dev@localhost tmp]$ cat rsa_private_key.pem
-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----
生成公鑰
[dev@localhost tmp]$ openssl rsa -in rsa_private_key.pem -out rsa_public_key.pem -pubout
writing RSA key
[dev@localhost tmp]$ cat rsa_public_key.pem
-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAx9ZhbXC5a1/Arr7ZQOkL
iyZLR85FzQD8+VHZhzAN1T+FWmquXNkLxvd2AaWavdWmROFm6cgsnu2UBftoB9HA
imoufzrTVSIMZm9nxOqn1UD9f6wXr3RPX9Wne/PsZFk5xEK8T9eiWKRByfjIpSuF
rze85fMGaIuHfl+KroGI7I8x6uqIxVpbUTPuufAhcY7fHcb9a67nTBfvFv45ec2h
KXRpPavYyRmngIHTEfmwlM/WCSdFyciJ9i6DMDStiTV3CqSHlHgoZG6ppRed5RwZ
uTJc9TUH+UUKsNoi/8cNQM+wyKISSAY8SGqqtsszn+EMxaC9rN99o1H43R8XpXDW
gQIDAQAB
-----END PUBLIC KEY-----
修改私鑰編碼，否則Java無法使用
[dev@localhost tmp]$ openssl pkcs8 -topk8 -in rsa_private_key.pem -out pkcs8_rsa_private_key.pem -nocrypt
[dev@localhost tmp]$ cat pkcs8_rsa_private_key.pem
-----BEGIN PRIVATE KEY-----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-----END PRIVATE KEY-----
