RSA：如何在Java中生成私钥并在C＃中使用它？

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我想在java中生成私钥，将其保存为某些文件中的64基本编码字符串，然后使用此保存的文件在C＃中加密一些短语。 我知道在java中生成密钥并用64基数编码。 我的问题是如何在C＃中使用这个键？ 这是一个将代码保存到文本文件中的java代码原型：

I would like to generate private key in java, save it as a 64 base encoded string in some file and then encrypt some phrase in C# using this saved file. I know to generate keys in java and encode it with 64 base. My question is how do I use this key in C#? This is a java code prototype to save private key into text file:

KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA"); RSAKeyGenParameterSpec spec = new RSAKeyGenParameterSpec(1024, RSAKeyGenParameterSpec.F4); keyGen.initialize(spec); KeyPair keyPair = keyGen.generateKeyPair(); PrivateKey privateKey = keyPair.getPrivate(); writeToFile("privateKey", Base64.encode(keyPair.getPrivate().getEncoded()));

我想在C＃中实现以下函数，但是找不到如何创建RSAParameters或 RSACryptoServiceProvider from private key

I would like to implement following function in C# but can't find how to create RSAParameters or RSACryptoServiceProvider from private key

public static string DecryptData(string privateKey64Base, string data64Base) { // create using privateKey64Base // create RSACryptoServiceProvider rsa using RSAParameters above // byte[] encryptedData = rsa.Encrypt(Convert.FromBase64String(data64Base); }

推荐答案

此页面包含您的情况的建议，因为您正在写出PKCS＃8键（与keyPair.getPrivate（）。getEncoded（））

This page contains advice for your situation, since you are writing out PKCS#8 keys (with keyPair.getPrivate().getEncoded())

使用这种方法，您将使用Java端的实用程序首先将私钥获取为PRIVATEKEYBLOB格式。

Using this approach you would use the utility on the Java side to get the private key into the PRIVATEKEYBLOB format in the first place.

，你可以使用BouncyCastle C＃，它可以读取密钥（见例如

Alternatively, you could use BouncyCastle C# which can read the key in (see e.g. Org.BouncyCastle.Security.PrivateKeyFactory.CreateKey - you'd need to Base64 decode first of course).

这个上一个问题的答案是从生成的BC密钥转换成的对象到RSACryptoServiceProvider： BouncyCastle RSAPrivateKey到.NET RSAPrivateKey

This previous question has the answer for converting from the resulting BC key object to RSACryptoServiceProvider: BouncyCastle RSAPrivateKey to .NET RSAPrivateKey

第三，你可能想查看使用密钥库，例如PKCS＃12，这是一种更标准（和安全）的存储私钥的方式。

Thirdly, you might want to look at using a keystore, e.g. PKCS#12, which is a more standard (and secure) way for storing private keys.