解密PKCS＃7加密数据在C＃ [英] Decrypting PKCS#7 encrypted data in C#

问题描述

我正在开发一个解决方案，需要解密PKCS＃7加密的数据，最好在C＃。就我所见，.NET api通过System.Security.Cryptography.Pkcs命名空间支持这一点。然而，似乎实现只能工作在字节数组。那么当我有一个大的加密文件，不适合内存，我该怎么办？

I am working on a solution that needs to decrypt PKCS#7 encrypted data, preferably in C#. As far as I can see, the .NET api has support for this through the System.Security.Cryptography.Pkcs namespace. However it seems that the implementation can only work on byte arrays. So what do I do when I have a large encrypted file that does not fit into the memory?

我缺少这里的东西，或者有另一种方式做到这一点一个流级别而不是使用bytearrays？

Am I missing something here, or is there another way to do this on a Stream level instead of using bytearrays?

推荐答案

.NET框架只对PKCS＃7 / CMS有初步支持，不支持流式传输数据。

The .NET framework has only rudimentary support for PKCS#7/CMS, so it does not support streaming the data.

您需要第三方库。正如其他人提到的，BouncyCastle是一个很好的选择。它支持PKCS＃7（PKCS＃7也称为CMS）。

You need a 3rd party library. As others have mentioned, BouncyCastle is an excellent choice. It does support PKCS#7 (PKCS#7 is also known as CMS).

他们的测试可能是一个寻找示例代码的好地方： EnvelopedDataStreamTest.cs 。

Their tests are probably a good place to look for sample code: EnvelopedDataStreamTest.cs.

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