用私钥c加密RSA#

Question

我试图通过RSA加密字符串。我也有java样本，但我不能正确地将其转换为c#。

RSA示例：

public static String RSA_Sign(String preparedStr, String secretKey) {
        try {
            PrivateKey priKey = getPrivateKey(secretKey);
            Signature signature = Signature.getInstance("SHA256WithRSA");
            signature.initSign(priKey);
            signature.update(content.getBytes(CharEncoding.UTF_8));
            byte[] signed = signature.sign();
            return new String(Base64.getEncoder().encode(signed));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    private static PrivateKey getPrivateKey(String key) {
        PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(Base64.getDecoder().decode(key));
        PrivateKey privateKey = null;
        try {
            KeyFactory keyFactory = KeyFactory.getInstance(RSA);
            privateKey = keyFactory.generatePrivate(keySpec);
        } catch (NoSuchAlgorithmException | InvalidKeySpecException e) {
            e.printStackTrace();
        }
        return privateKey;
    }

这是我在c#中生成的代码，但我的c#代码结果与javaCode结果不同。我的代码怎么了？

 public string GetRSA0(string input, string pkey)
    {
        var publicKey = $"<RSAKeyValue><Modulus>{pkey}</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>";

        var testData = Encoding.UTF8.GetBytes(input);

        using (var rsa = new RSACryptoServiceProvider(1024))
        {
            try
            {
                // client encrypting data with public key issued by server                    
                rsa.FromXmlString(publicKey.ToString());

                var encryptedData = rsa.Encrypt(testData, true);

                var base64Encrypted = Convert.ToBase64String(encryptedData);

                return base64Encrypted;
            }
            finally
            {
                rsa.PersistKeyInCsp = false;
            }
        }

    }

Answer 1

可以使用以下类来执行此操作：

public class RSATool
{
    public string Encrypt(string strText, string strPublicKey)
    {
        RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
        rsa.FromXmlString(strPublicKey);

        byte[] byteText = Encoding.UTF8.GetBytes(strText);
        byte[] byteEntry = rsa.Encrypt(byteText, false);

        return Convert.ToBase64String(byteEntry);
    }


    public string Decrypt(string strEntryText,string strPrivateKey)
    {
        RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
        rsa.FromXmlString(strPrivateKey);

        byte[] byteEntry = Convert.FromBase64String(strEntryText);
        byte[] byteText = rsa.Decrypt(byteEntry, false);

        return Encoding.UTF8.GetString(byteText);
    }

    public Dictionary GetKey()
    {
        Dictionary dictKey = new Dictionary();
        RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();

        dictKey.Add("PublicKey", rsa.ToXmlString(false));
        dictKey.Add("PrivateKey", rsa.ToXmlString(true));

        return dictKey;
    }
}

你可以使用它如下

        RSATool myRSA = new RSATool();
        Dictionary dictK = new Dictionary();
        dictK = myRSA.GetKey();

        string strText = "123456";
        Console.writeline (" string to encrypt: {0}", strText);

        string str1 = myRSA.Encrypt("123456", dictK["PublicKey"]);
        Console.WriteLine(" encrypted string: {0}", str1);

        string str2 = myRSA.Decrypt(str1, dictK["PrivateKey"]);
        Console.WriteLine(" decrypted string: {0}", str2);