RSA密钥生成问题 [英] RSA keys generation problem

问题描述

嗨
我正在尝试使用RSA加密和解密某些数据.我在创建自己的公钥和私钥并使用它们时遇到问题.这是我到目前为止所做的

我创建了RSACryptoServiceProvider和CspParameters，因为我将密钥存储在密钥容器中:

Hi
I''m trying to encrypt and decrypt some data with RSA. I''m having problems in creating my own public and private keys and use them. This is what I did so far

I create an RSACryptoServiceProvider and a CspParameters because Im storing my keys into a key container:

CspParameters cp = new CspParameters();
cp.KeyContainerName = stContainerName; //stContainerName is a string

// 256 bytes RSA key pair
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(2048, cp);

然后，我以此检索公共RSA密钥.我使用XmlDocument处理RSA密钥数据

Then I retrieve the public RSA key with this. I use a XmlDocument to handle the RSA Key Data

XmlDocument xmlDoc = new XmlDocument();
//true is for retrieve both the public and private RSA key
xmlDoc.InnerXml = rsa.ToXmlString(true);

XmlNodeList xmlPublicModulus = xmlDoc.GetElementsByTagName("Modulus");
XmlNodeList xmlPublicExp = xmlDoc.GetElementsByTagName("Exponent");

之后，我尝试加密和解密一些数据.我声明了一个新的RSACryptoServiceProvider，它将具有公共密钥信息.

After that i try to encrypt and decrypt some data. I declare a new RSACryptoServiceProvider which will have the public key info.

string stDataToEncrypt = "Hey there";
string stDeencryptedData;
byte[] btEncryptedData;

//Getting the Modulus and exp from XML Data
byte[] publicModulus = Encoding.ASCII.GetBytes(xmlPublicModulus[0].InnerText);
byte[] publicExp = Encoding.ASCII.GetBytes(xmlPublicExp[0].InnerText);

//Setting Up the public key            
RSAParameters publicRSAKeyInfo = new RSAParameters();            publicRSAKeyInfo.Modulus = publicModulus;
publicRSAKeyInfo.Exponent = publicExp;

//Creating the Public Key - I think this is wrong...
RSACryptoServiceProvider rsaPublic = new RSACryptoServiceProvider(2048);
rsaPublic.ImportParameters(publicRSAKeyInfo);

//Encrypting data. Im assuming that if I encrypt with the 
//RSACryptoServiceProvider rsa it will do it with the private key
btEncryptedData= rsa.Encrypt(Encoding.ASCII.GetBytes(stDataToEncrypt ),false);

//Decrypting data. Im using the RSACryptoServiceProvider rsaPublic, which has the
//public key data. HERE I GOT AN EXCEPTION
stDeencryptedData= Encoding.ASCII.GetString(rsaPublic.Decrypt(btDatoEncriptado,false));

Console.WriteLine("datoDesencriptado: " + datoDesencriptado);

我有一个例外:不正确的密钥.检查rsaPublic对象的参数，KeyLenght属性为2752.rsa对象中的此参数为2048.这告诉我我做错了什么.

我对RSACryptoServiceProvider对象的了解是，它创建了一个RSA密钥对.因此，如果我想给其他人公开密钥，并且想用私有密钥加密或解密，这就是我要做的事情

任何帮助将不胜感激，请原谅我的英语

问候

Iván

I got an exception: incorrect key. Cheking the parameters of the rsaPublic object, the KeyLenght property is 2752. This parameter in rsa object is 2048. This tells me that I am doing somethin wrong.

What I understand of RSACryptoServiceProvider object is that it creates a RSA Key pair. So if I want to give someone else the public key, and I want to encrypt or decrypt with the private key, this is what I have to do

Any help would be appreciated and excuse my english

Regards

Iván

推荐答案

该模式将如何工作?不！您完全错过了公钥密码术的整个想法.

读我的嘴唇::-)

您始终使用一个密钥进行加密，而使用另一个密钥进行解密！

要了解其为何以这种方式工作，请阅读以下内容: http://en. wikipedia.org/wiki/单向功能 [^ ].

另请参阅: http://en.wikipedia.org/wiki/RSA [

How this schema would possible work?! No! You completely miss the whole idea of the Public-key Cryptography.

Read my lips: :-)

You always encrypt with one key but decrypt with another one!

To understand why it works this way, please read this: http://en.wikipedia.org/wiki/Public-key_cryptography[^].
Just follow the logic of exchange between Alice and Bob.

It''s all based on the idea of one-way function: http://en.wikipedia.org/wiki/One-way_function[^].

See also: http://en.wikipedia.org/wiki/RSA[^].

—SA

我找到的解决方案

使用以下内容中提供的RSA类:
RSA私钥加密 [

The solution I found

Use the RSA classes provided in:
RSA Private Key Encryption[^]

I modified some methods in order to get the private and public keys from a strings instead of a xml file, because I want to use the .NET Key containers feature.

These are how my main methods looks:

public static void CreateRSAKeys(string stContainerName)
{
    // Create the CspParameters object and set the key container
    // name used to store the RSA key pair.
    CspParameters cp = new CspParameters();
    cp.KeyContainerName = stContainerName;

    // Create a new instance of RSACryptoServiceProvider that accesses
    // the key container MyKeyContainerName.
    RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(2048,cp);
    Console.WriteLine("RSA KEY Created: " + rsa.ToXmlString(false));
}

public static void EncryptWithPrivateKey(string stContainerName)
{
    RSAEncryption myRsaPrivateEncryption = new RSAEncryption();

    string stDataToEncrypt = "Hey There";
    byte[] btEncryptedData;
    byte[] btDeencryptedData;
    string stDeencryptedData;

    // Create the CspParameters object and set the key container
    // name used to store the RSA key pair.
    CspParameters cp = new CspParameters();
    cp.KeyContainerName = stContainerName;

    // Create a new instance of RSACryptoServiceProvider that accesses
    // the key container MyKeyContainerName.
    RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(2048, cp);

    //Loading the private  and the key into the MyRSA object
    myRsaPrivateEncryption.LoadPrivateFromString(rsa.ToXmlString(true));
    btEncryptedData = myRsaPrivateEncryption.PrivateEncryption(Encoding.ASCII.GetBytes(stDataToEncrypt));
    btDeencryptedData = myRsaPrivateEncryption.PublicDecryption(btEncryptedData);
    stDeencryptedData = Encoding.ASCII.GetString(btDeencryptedData );

    Console.WriteLine(stDeencryptedData);
}

解决了！ :)

Solved! :)

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