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# 使用您的 CA 证书创建客户端证书
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您可以使用自己的证书颁发机构（CA）创建客户端证书。必须先注册客户证书， AWS IoT 然后才能使用。有关客户端证书的注册选项的信息，请参阅 [注册客户端证书](register-device-cert.md)。

## 创建客户端证书（CLI）
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**注意**  
您无法在 AWS IoT 控制台中执行此过程。

**要使用创建客户证书 AWS CLI**

1. 生成密钥对。

   ```
   openssl genrsa -out device_cert_key_filename.key 2048
   ```

1. 为客户端证书创建 CSR。

   ```
   openssl req -new \
       -key device_cert_key_filename.key \
       -out device_cert_csr_filename.csr
   ```

   系统将提示您输入一些信息，如下所示：

   ```
   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]:
       State or Province Name (full name) []:
       Locality Name (for example, city) []:
       Organization Name (for example, company) []:
       Organizational Unit Name (for example, section) []:
       Common Name (e.g. server FQDN or YOUR name) []:
       Email Address []:
   
       Please enter the following 'extra' attributes
       to be sent with your certificate request
       A challenge password []:
       An optional company name []:
   ```

1. 从 CSR 创建客户端证书。

   ```
   openssl x509 -req \
       -in device_cert_csr_filename.csr \
       -CA root_CA_cert_filename.pem \
       -CAkey root_CA_key_filename.key \
       -CAcreateserial \
       -out device_cert_filename.pem \
       -days 500 -sha256
   ```

 此时，客户证书已创建，但尚未在中注册 AWS IoT。有关注册客户端证书的方式和时机的信息，请参阅 [注册客户端证书](register-device-cert.md)。