C＃とBouncy CastleのRSA PrivateKeyを読んでください

Question

私はOpenSSL形式の公開鍵ファイルと秘密鍵ファイルに正常に書きました。

ファイル：

-----BEGIN PUBLIC KEY----- 
MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCpHCHYgawzNlxVebSKXL7vfc/i 
hP+dQgMxlaPEi7/vpQtV2szHjIP34MnUKelXFuIETJjOgjWAjTTJoj38MQUWc3u7 
SRXaGVggqQEKH+cRi5+UcEObIfpi+cIyAm9MJqKabfJK2e5X/OS7FgAwPjgtDbZO 
ZxamOrWWL8KGB+lH+QIDAQAB 
-----END PUBLIC KEY----- 

-----BEGIN RSA PRIVATE KEY----- 
MIICXAIBAAKBgQCpHCHYgawzNlxVebSKXL7vfc/ihP+dQgMxlaPEi7/vpQtV2szH 
jIP34MnUKelXFuIETJjOgjWAjTTJoj38MQUWc3u7SRXaGVggqQEKH+cRi5+UcEOb 
Ifpi+cIyAm9MJqKabfJK2e5X/OS7FgAwPjgtDbZOZxamOrWWL8KGB+lH+QIDAQAB 
AoGBAIXtL6jFWVjdjlZrIl4JgXUtkDt21PD33IuiVKZNft4NOWLu+wp17/WZYn3S 
C2fbSXfaKZIycKi0K8Ab6zcUo0+QZKMoaG5GivnqqTPVAuZchkuMUSVgjGvKAC/D 
12/b+w+Shs9pvqED1CxfvtePXNwL6ZNuaREFC5hF/YpMVyg5AkEA3BUCZYJ+Ec96 
2cwsdY6HocW8Kn+RIqMjkNtyLA19cQV5mpIP7kAiW6drBDlraVANi+5AgK2zQ+ZT 
hYzs/JfRKwJBAMS1g5/B7XXnfC6VTRs8AMveZudi5wS/aGpaApybsfx1NTLLsm3l 
GmGTkbCr+EPzvJ5zRSIAHAA6N6NdORwzEWsCQHTli+JTD5dyNvScaDkAvbYFi06f 
d32IXYnBpcEUYT65A8BAOMn5ssYwBL23qf/ED431vLkcig1Ut6RGGFKKaQUCQEfa 
UdkSWm39/5N4f/DZyySs+YO90csfK8HlXRzdlnc0TRlf5K5VyHwqDkatmoMfzh9G 
1dLknVXL7jTjQZA2az8CQG0jRSQ599zllylMPPVibW98701Mdhb1u20p1fAOkIrz 
+BNEdOPqPVIyqIP830nnFsJJgTG2eKB59ym+ypffRmA= 
-----END RSA PRIVATE KEY----- 

と公開鍵はもちろんのちょうど公開鍵の部分が含まれています。

私のメッセージを公開鍵で暗号化した後。私は秘密鍵ファイル を読んでそれを解読したいが、それはうまくいかない。非対称キーにオブジェクトをキャストできないというプライベートキーを読み取ろうとして例外が発生します。ここで

は私のコードです：ここでは

public static AsymmetricKeyParameter ReadAsymmetricKeyParameter(string pemFilename) 
{ 
    var fileStream = System.IO.File.OpenText(pemFilename); 
    var pemReader = new Org.BouncyCastle.OpenSsl.PemReader(fileStream); 
    var KeyParameter = (Org.BouncyCastle.Crypto.AsymmetricKeyParameter)pemReader.ReadObject(); 
    return KeyParameter; 
} 

static void Encrypt2(string publicKeyFileName, string inputMessage, string encryptedFileName) 
    { 
     UTF8Encoding utf8enc = new UTF8Encoding(); 
     FileStream encryptedFile = null; 

     try 
     { 
      // Converting the string message to byte array 
      byte[] inputBytes = utf8enc.GetBytes(inputMessage); 

      // RSAKeyPairGenerator generates the RSA Key pair based on the random number and strength of key required 
      /*RsaKeyPairGenerator rsaKeyPairGnr = new RsaKeyPairGenerator(); 
      rsaKeyPairGnr.Init(new Org.BouncyCastle.Crypto.KeyGenerationParameters(new SecureRandom(), 512)); 
      Org.BouncyCastle.Crypto.AsymmetricCipherKeyPair keyPair = rsaKeyPairGnr.GenerateKeyPair(); 
      */ 

      AsymmetricKeyParameter publicKey = ReadAsymmetricKeyParameter(publicKeyFileName); 

      // Creating the RSA algorithm object 
      IAsymmetricBlockCipher cipher = new RsaEngine(); 

      // Initializing the RSA object for Encryption with RSA public key. Remember, for encryption, public key is needed 
      cipher.Init(true, publicKey); 

      //Encrypting the input bytes 
      byte[] cipheredBytes = cipher.ProcessBlock(inputBytes, 0, inputMessage.Length); 

      //Write the encrypted message to file 
      // Write encrypted text to file 
      encryptedFile = File.Create(encryptedFileName); 
      encryptedFile.Write(cipheredBytes, 0, cipheredBytes.Length); 
     } 
     catch (Exception ex) 
     { 
      // Any errors? Show them 
      Console.WriteLine("Exception encrypting file! More info:"); 
      Console.WriteLine(ex.Message); 
     } 
     finally 
     { 
      // Do some clean up if needed 
      if (encryptedFile != null) 
      { 
       encryptedFile.Close(); 
      } 
     } 

    } 

は、復号化機能です。 2つ目はBouncy Castleを使用しないことですが、Bouncy Castleを使用するのは後でJavaで暗号化と復号化を行うためです。

static void Decrypt2(string privateKeyFileName, string encryptedFileName, string plainTextFileName) 
    { 
     UTF8Encoding utf8enc = new UTF8Encoding(); 
     FileStream encryptedFile = null; 
     StreamWriter plainFile = null; 
     byte[] encryptedBytes = null; 
     string plainText = ""; 

     try 
     { 
      // Converting the string message to byte array 
      //byte[] inputBytes = utf8enc.GetBytes(inputMessage); 

      // RSAKeyPairGenerator generates the RSA Key pair based on the random number and strength of key required 
      /*RsaKeyPairGenerator rsaKeyPairGnr = new RsaKeyPairGenerator(); 
      rsaKeyPairGnr.Init(new Org.BouncyCastle.Crypto.KeyGenerationParameters(new SecureRandom(), 512)); 
      Org.BouncyCastle.Crypto.AsymmetricCipherKeyPair keyPair = rsaKeyPairGnr.GenerateKeyPair(); 
      */ 


      StreamReader sr = File.OpenText(privateKeyFileName); 
      PemReader pr = new PemReader(sr); 

      PemReader pemReader = new PemReader(new StringReader(privateKeyFileName)); 
      AsymmetricCipherKeyPair keyPair = (AsymmetricCipherKeyPair)pemReader.ReadObject(); 
      Console.WriteLine(keyPair.ToString()); 
      AsymmetricKeyParameter privatekey = keyPair.Private; 


      Console.WriteLine(pr.ReadPemObject()); 
      AsymmetricCipherKeyPair KeyPair = (AsymmetricCipherKeyPair)pr.ReadObject(); 

      AsymmetricKeyParameter privateKey = ReadAsymmetricKeyParameter(privateKeyFileName); 

      // Creating the RSA algorithm object 
      IAsymmetricBlockCipher cipher = new RsaEngine(); 
      Console.WriteLine("privateKey: " + privateKey.ToString()); 

      // Initializing the RSA object for Decryption with RSA private key. Remember, for decryption, private key is needed 
      //cipher.Init(false, KeyPair.Private); 
      //cipher.Init(false, KeyPair.Private); 
      cipher.Init(false, keyPair.Private);  

      // Read encrypted text from file 
      encryptedFile = File.OpenRead(encryptedFileName); 
      encryptedBytes = new byte[encryptedFile.Length]; 
      encryptedFile.Read(encryptedBytes, 0, (int)encryptedFile.Length); 

      //Encrypting the input bytes 
      //byte[] cipheredBytes = cipher.ProcessBlock(inputBytes, 0, inputMessage.Length); 
      byte[] cipheredBytes = cipher.ProcessBlock(encryptedBytes, 0, encryptedBytes.Length); 

      //Write the encrypted message to file 
      // Write encrypted text to file 
      plainFile = File.CreateText(plainTextFileName); 
      plainText = Encoding.Unicode.GetString(cipheredBytes); 
      plainFile.Write(plainText); 
     } 
     catch (Exception ex) 
     { 
      // Any errors? Show them 
      Console.WriteLine("Exception encrypting file! More info:"); 
      Console.WriteLine(ex.Message); 
     } 
     finally 
     { 
      // Do some clean up if needed 
      if (plainFile != null) 
      { 
       plainFile.Close(); 
      } 
      if (encryptedFile != null) 
      { 
       encryptedFile.Close(); 
      } 
     } 
    } 


    // Decrypt a file 
    static void Decrypt(string privateKeyFileName, string encryptedFileName, string plainFileName) 
    { 
     // Variables 
     CspParameters cspParams = null; 
     RSACryptoServiceProvider rsaProvider = null; 
     StreamReader privateKeyFile = null; 
     FileStream encryptedFile = null; 
     StreamWriter plainFile = null; 
     string privateKeyText = ""; 
     string plainText = ""; 
     byte[] encryptedBytes = null; 
     byte[] plainBytes = null; 

     try 
     { 
      // Select target CSP 
      cspParams = new CspParameters(); 
      cspParams.ProviderType = 1; // PROV_RSA_FULL 
      //cspParams.ProviderName; // CSP name 
      rsaProvider = new RSACryptoServiceProvider(cspParams); 

      // Read private/public key pair from file 
      privateKeyFile = File.OpenText(privateKeyFileName); 
      privateKeyText = privateKeyFile.ReadToEnd(); 

      // Import private/public key pair 
      rsaProvider.FromXmlString(privateKeyText); 

      // Read encrypted text from file 
      encryptedFile = File.OpenRead(encryptedFileName); 
      encryptedBytes = new byte[encryptedFile.Length]; 
      encryptedFile.Read(encryptedBytes, 0, (int)encryptedFile.Length); 

      // Decrypt text 
      plainBytes = rsaProvider.Decrypt(encryptedBytes, false); 

      // Write decrypted text to file 
      plainFile = File.CreateText(plainFileName); 
      plainText = Encoding.Unicode.GetString(plainBytes); 
      plainFile.Write(plainText); 
     } 
     catch (Exception ex) 
     { 
      // Any errors? Show them 
      Console.WriteLine("Exception decrypting file! More info:"); 
      Console.WriteLine(ex.Message); 
     } 
     finally 
     { 
      // Do some clean up if needed 
      if (privateKeyFile != null) 
      { 
       privateKeyFile.Close(); 
      } 
      if (encryptedFile != null) 
      { 
       encryptedFile.Close(); 
      } 
      if (plainFile != null) 
      { 
       plainFile.Close(); 
      } 
     } 

    } // Decrypt 

ご協力いただければ幸いです！

Answer 1

私はこれを理解しました。基本的にはBouncyCastleを使用してプライベートopensslのキーを読み、C＃が、このようなものですします実際にはありません「それは働いていない」

AsymmetricKeyParameter key = readPrivateKey(pemFilename);  
RsaEngine e = new RsaEngine();  
e.Init(false, key); 

byte[] decipheredBytes = e.ProcessBlock(cipheredData, 0, cipheredData.Length);