java 加密API AES RSA MD5 SHA-1 SHA-256

最新推荐文章于 2024-02-07 10:29:17 发布

原创最新推荐文章于 2024-02-07 10:29:17 发布 · 306 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#java

每天进步一点专栏收录该内容

38 篇文章

订阅专栏

这篇博客详细介绍了几种常见的加解密和哈希算法的Java实现，包括AES的ECB模式加解密、RSA的公钥私钥加密解密以及MD5、SHA-1和SHA-256的哈希计算。通过示例代码，展示了如何在实际应用中使用这些技术确保数据的安全性和完整性。

AES ----

public static String aesEncode(String message, String key) {
        try {
            Cipher c = Cipher.getInstance("AES/ECB/PKCS5Padding");

            SecretKeySpec secretKeySpec = new SecretKeySpec(key.getBytes("UTF-8"),"AES");

            c.init(Cipher.ENCRYPT_MODE,secretKeySpec);
            byte[] bytes = c.doFinal(message.getBytes("UTF-8"));
            byte[] encode = Base64.getEncoder().encode(bytes);
            return new String(encode,"UTF-8");
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return null;
    }


    public static String aesDecode(String message, String key) {
        try {
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
            SecretKeySpec secretKeySpec = new SecretKeySpec(key.getBytes("UTF-8"),"AES");
            cipher.init(Cipher.DECRYPT_MODE,secretKeySpec);
            byte[] bytes = cipher.doFinal(Base64.getDecoder().decode(message.getBytes("UTF-8")));
            return new String(bytes,"UTF-8");

        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }


        return null;
    }

RSA -----

 private static String rsaEncode(String message,PublicKey key) {
        try {

            Cipher cipher = Cipher.getInstance("RSA");

            cipher.init(Cipher.ENCRYPT_MODE,key);

            byte[] bytes = cipher.doFinal(message.getBytes());

            byte[] encode = Base64.getEncoder().encode(bytes);
            System.out.println(new String(encode));
            return new String(encode);

        } catch (NoSuchAlgorithmException | NoSuchPaddingException | InvalidKeyException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        }
        return null;
    }



    public static String decode(String message, PrivateKey key){

        try {
            Cipher cipher = Cipher.getInstance("RSA");
            cipher.init(Cipher.DECRYPT_MODE,key);
            byte[] bytes = cipher.doFinal(Base64.getDecoder().decode(message.getBytes()));
            return new String(bytes);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        }
        return null;
    }

MD5 SHA-1 SHA-256 —

private static String md5Encode(String message) {
        try {
            MessageDigest messageDigest = MessageDigest.getInstance("MD5");
            byte[] digest = messageDigest.digest(message.getBytes());


            StringBuilder builder = byte2Hex(digest);

            System.out.println(builder);

            return builder.toString();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }

        return null;
    }


    private static String sha1Encode(String message){

        try {
            MessageDigest messageDigest = MessageDigest.getInstance("SHA-1");
            byte[] digest = messageDigest.digest(message.getBytes());
            StringBuilder builder = byte2Hex(digest);

            System.out.println(builder);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }

        return null;
    }

    private static String sha128Encode(String message){

        try {
            MessageDigest messageDigest = MessageDigest.getInstance("SHA-256");
            byte[] digest = messageDigest.digest(message.getBytes());
            StringBuilder builder = byte2Hex(digest);

            System.out.println(builder);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }

        return null;
    }

    private static StringBuilder byte2Hex(byte[] digest) {
        StringBuilder builder = new StringBuilder();
        for (byte b : digest) {
            String format = String.format("%02x", b);
            builder.append(format);
        }
        return builder;
    }