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1、看你下载的是哪种证书文件：In most cases (SSL and code signing), both formats are supported by the SimpleLink™ Wi-Fi® device. The only exception is the SSL chained certificates, which must be programmed as a PEM file.
2、私钥只是在CSR使用过程中使用一下，不被读取出来
The SimpleLink Wi-Fi device simplifies this process by generating a CSR in PKCS #10 format internally. The CSR is created as a file on the device's file system and can be read like any other non-secure file. An additional benefit of generating the CSR internally is that it allows the private key of the asymmetric key-pair to never be exposed during the certificate creation and registration process.
• Client Authentication If the server requires client authentication, the following files are required: – Private Key – Station (client) RSA private key file in PEM format – Client Certificate – Certificate of the client, given by the authenticating network (has the public key matches to the private key) in PEM format • Server Authentication The SimpleLink Wi-Fi device requires server authentication by default and the following file is required: Server Root CA file – This file must be in PEM format. The demand for server authentication can be canceled through the WLAN setting. Canceling this authentication is valid for a single manual connection only.
Those files must be programmed with the following names: • Root CA – sys/cert/ca.der • Client certificate – sys/cert/client.der • Private key – sys/cert/private.key 文件系统里需要der格式，那前面那段客户端证书私钥和服务器端根证书又说必须是pem格式
