阅读c#和Bouncy Castle中的RSA PrivateKey

本文关键字：中的 RSA PrivateKey Castle Bouncy 阅读 | 更新日期: 2023-09-27 18:05:45

我已经成功地用OpenSSL格式写入公钥和私钥文件。

文件:

公钥当然只包含公钥部分

在使用公钥加密我的消息之后。我想读取私钥文件并解密它，但它不起作用。我遇到异常，试图读取私钥，说不能将对象转换为非对称密码。

下面是我的代码:

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();
            }
        }
    }

这是解密函数。第二个是不使用Bouncy Castle，然而，我宁愿使用Bouncy Castle，因为以后我也将在Java中加密和解密。

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

阅读c#和Bouncy Castle中的RSA PrivateKey

我明白了。使用BouncyCastle和c#读取openssl私钥的基本方法如下:

static AsymmetricKeyParameter readPrivateKey(string privateKeyFileName)
{
    AsymmetricCipherKeyPair keyPair;
    using (var reader = File.OpenText(privateKeyFileName))
        keyPair = (AsymmetricCipherKeyPair)new PemReader(reader).ReadObject();
    return keyPair.Private;
}

那么这个密钥可以用来解密如下数据:

AsymmetricKeyParameter key = readPrivateKey(pemFilename);       
RsaEngine e = new RsaEngine();      
e.Init(false, key);
byte[] decipheredBytes = e.ProcessBlock(cipheredData, 0, cipheredData.Length);