使用MD5WithRSA从.Pem / .Pkcs8密钥文件在C＃ [英] Sign data with MD5WithRSA from .Pem/.Pkcs8 keyfile in C#

问题描述

我有以下Java代码示例，我需要在C＃中重新启用它：

  PKCS8EncodedKeySpec privKeySpec = new PKCS8EncodedKeySpec（pkcs8PrivateKey）; 
 KeyFactory keyFactory = KeyFactory.getInstance（RSA）; 
 PrivateKey privKey = keyFactory.generatePrivate（privKeySpec）; 
签名sign = Signature.getInstance（MD5withRSA）; 
 
 sign.initSign（privKey）; 
 sign.update（data）; 
 byte [] signature = sign.sign（）; 
  

有可能使用标准的.Net Crypto API，还是应该使用BouncyCastle？
谢谢，

b。

解决方案遇到了一个非常类似的问题，试图创建一个原生的C＃工具包装Chrome扩展（使用SHA1，而不是MD5，但这不是一个很大的区别）。我相信我已经尝试了每一个可能的解决方案.Net：System.Security.Cryptography，BouncyCastle，OpenSSL.Net和Chilkat RSA。

最好的解决方案可能是Chilkat;他们的接口是最干净，最直接的，它得到良好的支持和良好的文档，并有一百万的例子。例如，下面是一些使用他们的库的代码，它们可以完成非常接近您想要的操作： http ：//www.example-code.com/csharp/rsa_signPkcs8.asp 。但是，它不是免费的（虽然150美元不是不合理，看到我烧了2天试图找出这一点，我有点超过75美元一天！）

作为一种免费的替代方法，JavaScience为多种语言（包括C＃/。Net）提供了一些源代码的加密实用程序，它们位于 http://www.jensign.com/JavaScience/cryptoutils/index.html 。最重要的是您想要做的是opensslkey（ http：//www.jensign .com / opensslkey / index.html ），它将允许您从.pem文件生成RSACryptoServiceProvider。然后可以使用该提供程序对代码进行签名：

  string pemContents = new StreamReader（pkcs8privatekey.pem）。ReadToEnd ）; 
 var der = opensslkey.DecodePkcs8PrivateKey（pemContents）; 
 RSACryptoServiceProvider rsa = opensslkey.DecodePrivateKeyInfo（der）; 
 
 signature = rsa.SignData（data，new MD5CryptoServiceProvider（））; 
  

I've got the following code sample in Java, and I need to re-enact it in C#:

PKCS8EncodedKeySpec privKeySpec = new PKCS8EncodedKeySpec(pkcs8PrivateKey);
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
PrivateKey privKey = keyFactory.generatePrivate(privKeySpec);
Signature sign = Signature.getInstance("MD5withRSA");

sign.initSign(privKey);
sign.update(data);
byte[] signature = sign.sign();

Is it possible with the standard .Net Crypto API, or should I use BouncyCastle? Thanks,

b.

解决方案

I am running into a very similar problem trying to create a native C# tool for packing Chrome extensions (using SHA1, not MD5, but that's not a big difference). I believe I have tried literally every possible solution for .Net: System.Security.Cryptography, BouncyCastle, OpenSSL.Net and Chilkat RSA.

The best solution is probably Chilkat; their interface is the cleanest and most straightforward, it's well-supported and well-documented, and there are a million examples. For instance, here's some code using their library that does something very close to what you want: http://www.example-code.com/csharp/rsa_signPkcs8.asp. However, it's not free (though $150 is not unreasonable, seeing as I have burned 2 days trying to figure this out, and I make a bit more than $75 a day!).

As a free alternative, JavaScience offers up a number of crypto utilities in source form for multiple languages (including C#/.Net) at http://www.jensign.com/JavaScience/cryptoutils/index.html. The one that's most salient to what you are trying to do is opensslkey (http://www.jensign.com/opensslkey/index.html), which will let you generate a RSACryptoServiceProvider from a .pem file. You can then use that provider to sign your code:

        string pemContents = new StreamReader("pkcs8privatekey.pem").ReadToEnd();
        var der = opensslkey.DecodePkcs8PrivateKey(pemContents);
        RSACryptoServiceProvider rsa = opensslkey.DecodePrivateKeyInfo(der);

        signature = rsa.SignData(data, new MD5CryptoServiceProvider());

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