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问如何在Java中使用3DES加密/解密？
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Stack Overflow用户

提问于 2008-08-21 23:25:23

回答 4查看 186.4K关注 0票数 76

我使用3DES编写的用Java编码字符串的每个方法都不能解密回原始字符串。有没有人有一个简单的代码片段，可以直接对字符串进行编码，然后解码成原始字符串？

我知道我在这段代码的某个地方犯了一个非常愚蠢的错误。这是我到目前为止一直在做的事情：

**请注意，我不会从encrypt方法返回BASE64文本，也不会在decrypt方法中进行base64解编码，因为我试图查看我是否在拼图的BASE64部分中犯了错误。

public class TripleDESTest {

    public static void main(String[] args) {

        String text = "kyle boon";

        byte[] codedtext = new TripleDESTest().encrypt(text);
        String decodedtext  = new TripleDESTest().decrypt(codedtext);

        System.out.println(codedtext);
        System.out.println(decodedtext);
    }

    public byte[] encrypt(String message) {
        try {
            final MessageDigest md = MessageDigest.getInstance("md5");
            final byte[] digestOfPassword = md.digest("HG58YZ3CR9".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("DESede/CBC/PKCS5Padding");
            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 cipherText;    
        }
        catch (java.security.InvalidAlgorithmParameterException e) { System.out.println("Invalid Algorithm"); }
        catch (javax.crypto.NoSuchPaddingException e) { System.out.println("No Such Padding"); }
        catch (java.security.NoSuchAlgorithmException e) { System.out.println("No Such Algorithm"); }
        catch (java.security.InvalidKeyException e) { System.out.println("Invalid Key"); }
        catch (BadPaddingException e) { System.out.println("Invalid Key");}
        catch (IllegalBlockSizeException e) { System.out.println("Invalid Key");}
        catch (UnsupportedEncodingException e) { System.out.println("Invalid Key");}

        return null;
    }

    public String decrypt(byte[] message) {
        try
        {
            final MessageDigest md = MessageDigest.getInstance("md5");
            final byte[] digestOfPassword = md.digest("HG58YZ3CR9".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("DESede/CBC/PKCS5Padding");
            decipher.init(Cipher.DECRYPT_MODE, key, iv);

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

            return plainText.toString();            
        }
        catch (java.security.InvalidAlgorithmParameterException e) { System.out.println("Invalid Algorithm"); }
        catch (javax.crypto.NoSuchPaddingException e) { System.out.println("No Such Padding"); }
        catch (java.security.NoSuchAlgorithmException e) { System.out.println("No Such Algorithm"); }
        catch (java.security.InvalidKeyException e) { System.out.println("Invalid Key"); }
        catch (BadPaddingException e) { System.out.println("Invalid Key");}
        catch (IllegalBlockSizeException e) { System.out.println("Invalid Key");}
        catch (UnsupportedEncodingException e) { System.out.println("Invalid Key");}     
        catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return null;
    }
}

java

encryption

3des

回答 4

Stack Overflow用户

发布于 2012-04-16 02:49:24

我很难自己找出答案，这篇文章帮助我找到了正确的答案。当按照ISO-8583处理金融消息时，3DES要求是非常具体的，所以对于我的特殊情况，"DESede/CBC/PKCS5Padding“组合不能解决问题。在将我的结果与一些为金融领域设计的3DES计算器进行了一些比较测试后，我发现“DESede/ECB/Nopadding值”更适合于特定的任务。

下面是我的TripleDes类的一个演示实现(使用Bouncy Castle提供程序)

    import java.security.InvalidKeyException;
    import java.security.NoSuchAlgorithmException;
    import java.security.NoSuchProviderException;
    import java.security.Security;
    import javax.crypto.BadPaddingException;
    import javax.crypto.Cipher;
    import javax.crypto.IllegalBlockSizeException;
    import javax.crypto.NoSuchPaddingException;
    import javax.crypto.SecretKey;
    import javax.crypto.spec.SecretKeySpec;
    import org.bouncycastle.jce.provider.BouncyCastleProvider;


    /**
     *
     * @author Jose Luis Montes de Oca
     */
    public class TripleDesCipher {
       private static String TRIPLE_DES_TRANSFORMATION = "DESede/ECB/Nopadding";
       private static String ALGORITHM = "DESede";
       private static String BOUNCY_CASTLE_PROVIDER = "BC";
       private Cipher encrypter;
       private Cipher decrypter;

       public TripleDesCipher(byte[] key) throws NoSuchAlgorithmException, NoSuchProviderException, NoSuchPaddingException,
             InvalidKeyException {
          Security.addProvider(new BouncyCastleProvider());
          SecretKey keySpec = new SecretKeySpec(key, ALGORITHM);
          encrypter = Cipher.getInstance(TRIPLE_DES_TRANSFORMATION, BOUNCY_CASTLE_PROVIDER);
          encrypter.init(Cipher.ENCRYPT_MODE, keySpec);
          decrypter = Cipher.getInstance(TRIPLE_DES_TRANSFORMATION, BOUNCY_CASTLE_PROVIDER);
          decrypter.init(Cipher.DECRYPT_MODE, keySpec);
       }

       public byte[] encode(byte[] input) throws IllegalBlockSizeException, BadPaddingException {
          return encrypter.doFinal(input);
       }

       public byte[] decode(byte[] input) throws IllegalBlockSizeException, BadPaddingException {
          return decrypter.doFinal(input);
       }
    }

票数 11

Stack Overflow用户

发布于 2012-07-07 02:37:12

这是一个非常简单的静态加密/解密类，基于Jose Luis Montes de Oca的Bouncy Castle无填充示例。这里使用的是“DESede/ECB/PKCS7Padding.”，这样我就不需要手动填充了。

    package com.zenimax.encryption;

    import java.security.InvalidKeyException;
    import java.security.NoSuchAlgorithmException;
    import java.security.NoSuchProviderException;
    import java.security.Security;
    import javax.crypto.BadPaddingException;
    import javax.crypto.Cipher;
    import javax.crypto.IllegalBlockSizeException;
    import javax.crypto.NoSuchPaddingException;
    import javax.crypto.SecretKey;
    import javax.crypto.spec.SecretKeySpec;
    import org.bouncycastle.jce.provider.BouncyCastleProvider;

    /**
     * 
     * @author Matthew H. Wagner
     */
    public class TripleDesBouncyCastle {
        private static String TRIPLE_DES_TRANSFORMATION = "DESede/ECB/PKCS7Padding";
        private static String ALGORITHM = "DESede";
        private static String BOUNCY_CASTLE_PROVIDER = "BC";

        private static void init()
        {
            Security.addProvider(new BouncyCastleProvider());
        }

        public static byte[] encode(byte[] input, byte[] key)
                throws IllegalBlockSizeException, BadPaddingException,
                NoSuchAlgorithmException, NoSuchProviderException,
                NoSuchPaddingException, InvalidKeyException {
            init();
            SecretKey keySpec = new SecretKeySpec(key, ALGORITHM);
            Cipher encrypter = Cipher.getInstance(TRIPLE_DES_TRANSFORMATION,
                    BOUNCY_CASTLE_PROVIDER);
            encrypter.init(Cipher.ENCRYPT_MODE, keySpec);
            return encrypter.doFinal(input);
        }

        public static byte[] decode(byte[] input, byte[] key)
                throws IllegalBlockSizeException, BadPaddingException,
                NoSuchAlgorithmException, NoSuchProviderException,
                NoSuchPaddingException, InvalidKeyException {
            init();
            SecretKey keySpec = new SecretKeySpec(key, ALGORITHM);
            Cipher decrypter = Cipher.getInstance(TRIPLE_DES_TRANSFORMATION,
                    BOUNCY_CASTLE_PROVIDER);
            decrypter.init(Cipher.DECRYPT_MODE, keySpec);
            return decrypter.doFinal(input);
        }
    }

票数 2

Stack Overflow用户

发布于 2022-01-05 22:49:04

private static final String UNICODE_FORMAT = "UTF8";
private static final String DESEDE_ENCRYPTION_SCHEME = "DESede";
private KeySpec ks;
private SecretKeyFactory skf;
private Cipher cipher;
byte[] arrayBytes;
private String encryptionSecretKey = "ThisIsSpartaThisIsSparta";
SecretKey key;

public TripleDesEncryptDecrypt() throws Exception {
    convertStringToSecretKey(encryptionSecretKey);
}

public TripleDesEncryptDecrypt(String encryptionSecretKey) throws Exception {
    convertStringToSecretKey(encryptionSecretKey);
}

public SecretKey convertStringToSecretKey (String encryptionSecretKey) throws Exception {
    arrayBytes = encryptionSecretKey.getBytes(UNICODE_FORMAT);
    ks = new DESedeKeySpec(arrayBytes);
    skf = SecretKeyFactory.getInstance(DESEDE_ENCRYPTION_SCHEME);
    cipher = Cipher.getInstance(DESEDE_ENCRYPTION_SCHEME);
    key = skf.generateSecret(ks);
    return key;
}

/**
 * Encrypt without specifying secret key
 * 
 * @param unencryptedString
 * @return String
 */
public String encrypt(String unencryptedString) {
    String encryptedString = null;
    try {
        cipher.init(Cipher.ENCRYPT_MODE, key);
        byte[] plainText = unencryptedString.getBytes(UNICODE_FORMAT);
        byte[] encryptedText = cipher.doFinal(plainText);
        encryptedString = new String(Base64.encodeBase64(encryptedText));
    } catch (Exception e) {
        e.printStackTrace();
    }
    return encryptedString;
}

/**
 * Encrypt with specified secret key
 * 
 * @param unencryptedString
 * @return String
 */
public String encrypt(String encryptionSecretKey, String unencryptedString) {
    String encryptedString = null;
    try {
        key = convertStringToSecretKey(encryptionSecretKey);
        cipher.init(Cipher.ENCRYPT_MODE, key);
        byte[] plainText = unencryptedString.getBytes(UNICODE_FORMAT);
        byte[] encryptedText = cipher.doFinal(plainText);
        encryptedString = new String(Base64.encodeBase64(encryptedText));
    } catch (Exception e) {
        e.printStackTrace();
    }
    return encryptedString;
}


/**
 * Decrypt without specifying secret key
 * @param encryptedString
 * @return
 */
public String decrypt(String encryptedString) {
    String decryptedText=null;
    try {
        cipher.init(Cipher.DECRYPT_MODE, key);
        byte[] encryptedText = Base64.decodeBase64(encryptedString);
        byte[] plainText = cipher.doFinal(encryptedText);
        decryptedText= new String(plainText);
    } catch (Exception e) {
        e.printStackTrace();
    }
    return decryptedText;
}

/**
 * Decrypt with specified secret key
 * @param encryptedString
 * @return
 */
public String decrypt(String encryptionSecretKey, String encryptedString) {
    String decryptedText=null;
    try {
        key = convertStringToSecretKey(encryptionSecretKey);
        cipher.init(Cipher.DECRYPT_MODE, key);
        byte[] encryptedText = Base64.decodeBase64(encryptedString);
        byte[] plainText = cipher.doFinal(encryptedText);
        decryptedText= new String(plainText);
    } catch (Exception e) {
        e.printStackTrace();
    }
    return decryptedText;
}

票数 0

页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持

原文链接：

https://stackoverflow.com/questions/20227

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