How to work with CryptoAPI via C#?

Question

There is a group of CryptoApi functions which works with crypto service providers (CSP).

CPAcquireContext
CPCreateHash
CPDecrypt
CPDeriveKey
CPDestroyHash
CPDestroyKey
CPDuplicateHash
CPDuplicateKey
CPEncrypt
CPExportKey
CPGenKey
CPGenRandom
CPGetHashParam
CPGetKeyParam
CPGetProvParam
CPGetUserKey
CPHashData
CPHashSessionKey
CPImportKey
CPReleaseContext
CPSetHashParam
CPSetKeyParam
CPSetProvParam
CPSignHash
CPVerifySignature

Yes, I know that there is System.Cryptography namespace. But I don't need their implementations.

Is there any ready library which provides a .NET wrapper to these functions?

The System.Security.Cryptography Namespace *is* a wrapper around the Windows CryptoAPI. — dtb, Jul 07 '11 at 13:39
Ok, what class(es) should I use to work with third party CSP? — VoimiX, Jul 07 '11 at 13:41
did you find any solution? I'm trying to create my own csp dll — Angelru, Jun 21 '23 at 09:25

score 3 · Answer 1 · answered Jul 07 '11 at 13:42

There has been an extended article on MSDN about this topic:

Extending .NET Cryptography with CAPICOM and P/Invoke

An article on using CryptoAPI Certificate Stores from .Net.

Some P/Invoke declarations lifted from this blog post that shows the p/Invoke definitions for it:

[snip] code sample too large for SO [/snip]

score 1 · Answer 2 · edited Dec 31 '13 at 06:39

1

I think your best bet is to use P/Invoke to pull the functionality into your C# application. Here's an (old) article on MSDN about using P/Invoke and CryptoAPI in C#:

Extending .NET Cryptography with CAPICOM and P/Invoke

It's for .Net 1.1, but the concepts are still the same.

edited Dec 31 '13 at 06:39

AaA

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answered Jul 07 '11 at 13:38

The Moof

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How to work with CryptoAPI via C#?

2 Answers2