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1. 交互式生成

自签名 SSL 证书的生成涉及一个简单的 3 步过程：

步骤 1：创建服务器私钥

openssl genrsa -out cert.key 2048

步骤 2：创建证书签名请求 (CSR)

openssl req -new -key cert.key -out cert.csr

You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
-----
Country Name (2 letter code) [AU]:CN
State or Province Name (full name) [Some-State]:BJ
Locality Name (eg, city) []:BJ
Organization Name (eg, company) [Internet Widgits Pty Ltd]:TM
Organizational Unit Name (eg, section) []:TM
Common Name (e.g. server FQDN or YOUR name) []:tm.com
Email Address []:Please enter the following 'extra' attributes
to be sent with your certificate request
A challenge password []:
An optional company name []:

步骤 3：使用私钥和 CSR 签署证书

openssl x509 -req -days 3650 -in cert.csr -signkey cert.key -out cert.crt

Certificate request self-signature ok
subject=C=CN, ST=BJ, L=BJ, O=TM, OU=TM, CN=tm.com

恭喜！您现在拥有有效期为 10 年的自签名 SSL 证书。

2. 一步生成

openssl req -new -newkey rsa:2048 -days 3650 -nodes -x509 \-subj "/C=CN/ST=BJ/L=BJ/O=TM/OU=TM/CN=tm.com" \-keyout cert.key -out cert.crt

参考

Generation of a Self Signed Certificate