C到Java加密和解密

我正在尝试用JavaAndroid进行加密和解密

下面是我的C代码，我需要将其转换为Java Android。有人能帮我怎么做吗

我已经这样做了将近2天，但还没有找到任何解决方案，如何转换它。我是Android的新手

public static string Encrypt(string toEncrypt)
        {
            byte[] keyArray;
            byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes(toEncrypt);

            System.Configuration.AppSettingsReader settingsReader = new AppSettingsReader();

            string key = "KEY";

            MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();
            keyArray = hashmd5.ComputeHash(UTF8Encoding.UTF8.GetBytes(key));
            hashmd5.Clear();

            TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
            tdes.Key = keyArray;
            tdes.Mode = CipherMode.ECB;
            tdes.Padding = PaddingMode.PKCS7;

            ICryptoTransform cTransform = tdes.CreateEncryptor();
            byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
            tdes.Clear();
            return Convert.ToBase64String(resultArray, 0, resultArray.Length);
        }

        public static string Decrypt(string cipherString)
        {
            try
            {
                byte[] keyArray;
                byte[] toEncryptArray = Convert.FromBase64String(cipherString);

                string key = "KEY";

                MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();
                keyArray = hashmd5.ComputeHash(UTF8Encoding.UTF8.GetBytes(key));
                hashmd5.Clear();

                TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
                tdes.Key = keyArray;
                tdes.Mode = CipherMode.ECB;
                tdes.Padding = PaddingMode.PKCS7;

                ICryptoTransform cTransform = tdes.CreateDecryptor();
                byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);

                tdes.Clear();
                return UTF8Encoding.UTF8.GetString(resultArray);
            }
            catch (Exception)
            {
                return "Invalid";
            }
        }

试试这个

package mypackage;

import java.security.MessageDigest;
import java.util.Arrays;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.codec.binary.Base64;

public class Main {

    public static void main(String[] args) throws Exception {

        String text = "neeraj";

        String codedtext = new Main().encrypt(text);

        String decodedtext = new Main().decrypt(codedtext);

        System.out.println(codedtext); // this is a byte array, you'll just see a reference to an array
        System.out.println(decodedtext); // This correctly shows "neeraj"
    }

    public String encrypt(String message) throws Exception {
        final MessageDigest md = MessageDigest.getInstance("md5");
        final byte[] digestOfPassword = md.digest("KEY"
                .getBytes("utf-8"));
        final byte[] keyBytes = Arrays.copyOf(digestOfPassword, 24);
        for (int j = 0, k = 16; j < 8;) {
            keyBytes[k++] = keyBytes[j++];
        }

        final SecretKey key = new SecretKeySpec(keyBytes, "DESede");
        final IvParameterSpec iv = new IvParameterSpec(new byte[8]);
        final Cipher cipher = Cipher.getInstance("DES/ECB/PKCS7Padding");
        cipher.init(Cipher.ENCRYPT_MODE, key, iv);

        final byte[] plainTextBytes = message.getBytes("utf-8");
        final byte[] cipherText = cipher.doFinal(plainTextBytes);
        // final String encodedCipherText = new sun.misc.BASE64Encoder()
        // .encode(cipherText);

        return Base64.encodeBase64String(cipherText);
    }

    public String decrypt(String input) throws Exception {

        byte[] message = Base64.decodeBase64(input);

        final MessageDigest md = MessageDigest.getInstance("md5");
        final byte[] digestOfPassword = md.digest("KEY"
                .getBytes("utf-8"));
        final byte[] keyBytes = Arrays.copyOf(digestOfPassword, 24);
        for (int j = 0, k = 16; j < 8;) {
            keyBytes[k++] = keyBytes[j++];
        }

        final SecretKey key = new SecretKeySpec(keyBytes, "DESede");
        final IvParameterSpec iv = new IvParameterSpec(new byte[8]);
        final Cipher decipher = Cipher.getInstance("DES/ECB/PKCS7Padding");
        decipher.init(Cipher.DECRYPT_MODE, key, iv);

        // final byte[] encData = new
        // sun.misc.BASE64Decoder().decodeBuffer(message);
        final byte[] plainText = decipher.doFinal(message);

        return new String(plainText, "UTF-8");
    }
}

有关用法，请参阅主功能

我已经更新了我的代码。您的C程序以base64字符串的形式给出输出。但在java中，解密的输入和加密的输出是字节数组。将字节数组转换为base64，它就可以工作了

对于java中的Base64操作，您需要

---

在java 8中，您可以使用java.util.Base64进行加密，您必须完成以下编码：

import java.security.MessageDigest;
import java.util.Arrays;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.codec.binary.Base64;



public String encrypt(String inputString,String key) throws Exception {

      //----  Use specified 3DES key and IV from other source -------------- 

     final MessageDigest md = MessageDigest.getInstance("md5");
     final byte[] digestOfPassword = md.digest(key.getBytes("utf-8"));
     final byte[] keyBytes = Arrays.copyOf(digestOfPassword, 24);
     for (int j = 0, k = 16; j < 8;) {
         keyBytes[k++] = keyBytes[j++];
     }

     final SecretKey sk = new SecretKeySpec(keyBytes, "DESede");
     final IvParameterSpec iv = new IvParameterSpec(new byte[8]);
     final Cipher cipher = Cipher.getInstance("DESede/CBC/PKCS5Padding");
     cipher.init(Cipher.ENCRYPT_MODE, sk, iv);

     final byte[] plainTextBytes = inputString.getBytes("utf-8");
     final byte[] cipherText = cipher.doFinal(plainTextBytes);
     // final String encodedCipherText = new sun.misc.BASE64Encoder()
     // .encode(cipherText);

     return Base64.encodeBase64String(cipherText);
}

---

而不是不想要的谢谢！不要分心，不要闲聊。你应该包括你期望的输出和你得到的。如果抛出这些错误，则返回所有错误。请用这些信息更新你的帖子。当你修改时，不要在你的问题中加入诸如编辑或更新之类的内容。本网站有编辑历史记录，需要查看差异的人可以从那里获得信息。请看一看，谢谢@K Neeraj Lal。但我已经测试过了，它不起作用。我用C中的加密函数加密字符串，用Java中的加密函数解密字符串，它会得到一个BadPaddingException错误。为什么不起作用？我已经更新了代码。你在使用CBC，而他在请求吗ECB@user2826499看看这段代码，它将是一个有用的源代码。