适用于 HTTP、activex 签名和大多数手机 SDK 的 SSL 证书
这主要是一个部署问题，而不是一个编程问题。
如果我从 CA 购买 SSL 证书，我是否可以使用它来签署其他应用程序（例如 symbian、android、iphone 应用程序）？
this is mostly a deployement than a programming question.
If I were to buy an SSL certificate from a CA, would I be able to use it to sign other applications (such as symbian, android, iphone ones)?
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您需要获得两个不同的证书。一种用于保护服务器 (https)，另一种用于签署代码。您可以在此处比较代码签名证书
You need to get two different certificates. One to secure a server (https) and one to sign code. You can compare code signing certificates here
服务器证书（用于在 Web 服务器上启用 HTTPS 的证书）很少启用代码签名。我没有研究过世界上的每一个 CA，可能存在例外，但是 CA 越“合法”，他们为两个应用程序颁发同一个证书的可能性就越小。最后，我不希望两者使用相同的证书。
大多数平台接受单个代码签名证书的可能性更大。每个平台的开发人员文档应列出哪些 CA 证书内置为可信根。此外，大多数平台将允许用户查看和修改列表。
Server certificates (those that you'd use to enable HTTPS on a web server) are rarely enabled for code signing. I haven't looked at every CA in the world, and there probably are exceptions, but the more "legit" a CA is, the less likely they are to issue one certificate for both applications. In the end, I wouldn't expect to use the same certificate for both.
There is a better chance that a single code-signing certificate is accepted by most platforms. The developer documentation of each platform should list what CA certificates are built-in as trusted roots. In addition, most platforms will allow a user to view and modify the list.
您需要购买专门授权进行码唱的证书。换句话说，证书必须具有用于代码签名的扩展密钥用法 (EKU)。用于代码签名的对象 ID (OID) 可以在此处
大多数商业 CA 应该能够告诉您他们的哪些证书具有此功能。
You need to buy a certificate that is specifically authorized for code singing. In other words, the certificate must have the Extended Key Usage (EKU) for Code signing. Object ID (OID) for code signing can be found here
Most commercial CA's should be able to tell you which of their certificates have this.