p>在Keychain Access中创建签名请求时，将生成您的私钥。生成并下载证书后，双击它将它添加到Keychain Access，它将与私钥匹配。然后，您可以选择证书，并打开箭头也选择私钥并将其作为.p12文件从Keychain Access中导出。

Your private key is generated when you created the signing request in Keychain Access. After the cert is generated and downloaded, double-clicking it will add it to Keychain Access where it will be matched up with the private key. You can then select the cert, and open the arrow to also select the private key and export them together as a .p12 file from Keychain Access.