cert证书文件(如果用户选择包签名)。
Cert certificate file (if the user chooses package signing).
需要使用上述两种方法来发送纯数据、加密数据、签名数据和压缩数据，或任何格式的带合作伙伴标识的包封数据 (PKCS7)。
The above two approaches are required to send plain data, encrypted data, signed data, and compressed data, or any form of enveloped data (PKCS7) with the partner's identification.
在这种情况下，利用基于包和继承层次结构的签名模式的全局方面可以做得更好。
A global aspect utilizing a signature pattern based on packages and the inheritance hierarchy would serve you better in this situation.
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