java实现的AES加密算法完整实例

下面是“Java实现的AES加密算法完整实例”的完整攻略：

一、概述

AES（Advanced Encryption Standard）是一种常用的对称加密算法，之前常用的DES算法已经不再安全。在Java中，可以通过javax.crypto包中的AES算法实现加密和解密。

二、实现步骤

1. 生成AES密钥

KeyGenerator kgen = KeyGenerator.getInstance("AES");
SecureRandom secureRandom = new SecureRandom();
kgen.init(128, secureRandom);
SecretKey secretKey = kgen.generateKey();
byte[] enCodeFormat = secretKey.getEncoded();

1. 加密明文

byte[] byteContent = plainText.getBytes("utf-8");
Cipher cipher = Cipher.getInstance("AES");
SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
cipher.init(Cipher.ENCRYPT_MODE, key);
byte[] result = cipher.doFinal(byteContent);

1. 解密密文

Cipher cipher = Cipher.getInstance("AES");
SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
cipher.init(Cipher.DECRYPT_MODE, key);
byte[] result = cipher.doFinal(cipherText);

三、完整实例示例

示例1

public class AESEncryptionExample {

    private static String plainText = "Hello, World! This is AES encryption example.";

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

        // 1. 生成AES密钥
        KeyGenerator kgen = KeyGenerator.getInstance("AES");
        SecureRandom secureRandom = new SecureRandom();
        kgen.init(128, secureRandom);
        SecretKey secretKey = kgen.generateKey();
        byte[] enCodeFormat = secretKey.getEncoded();

        // 2. 加密明文
        byte[] byteContent = plainText.getBytes("utf-8");
        Cipher cipher = Cipher.getInstance("AES");
        SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
        cipher.init(Cipher.ENCRYPT_MODE, key);
        byte[] result = cipher.doFinal(byteContent);
        System.out.println("加密结果：" + Hex.encodeHexString(result));

        // 3. 解密密文
        cipher = Cipher.getInstance("AES");
        key = new SecretKeySpec(enCodeFormat, "AES");
        cipher.init(Cipher.DECRYPT_MODE, key);
        byte[] decryptedResult = cipher.doFinal(result);
        System.out.println("解密结果：" + new String(decryptedResult));
    }
}

输出结果：

加密结果：f5d6c59d02faf570a07d2aa68942231170d5b3066decf40ef81f23455fe2aa909c6801fd2aad00017c1e2d7494791465
解密结果：Hello, World! This is AES encryption example.

示例2

public class AESEncryptionExample {

    private static String plainText = "这是一段中文明文";

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

        // 1. 生成AES密钥
        KeyGenerator kgen = KeyGenerator.getInstance("AES");
        SecureRandom secureRandom = new SecureRandom();
        kgen.init(128, secureRandom);
        SecretKey secretKey = kgen.generateKey();
        byte[] enCodeFormat = secretKey.getEncoded();

        // 2. 加密明文
        byte[] byteContent = plainText.getBytes("utf-8");
        Cipher cipher = Cipher.getInstance("AES");
        SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
        cipher.init(Cipher.ENCRYPT_MODE, key);
        byte[] result = cipher.doFinal(byteContent);
        System.out.println("加密结果：" + Hex.encodeHexString(result));

        // 3. 解密密文
        cipher = Cipher.getInstance("AES");
        key = new SecretKeySpec(enCodeFormat, "AES");
        cipher.init(Cipher.DECRYPT_MODE, key);
        byte[] decryptedResult = cipher.doFinal(result);
        System.out.println("解密结果：" + new String(decryptedResult));
    }
}

输出结果：

加密结果：cec96c19c049e5d664d1d9c7664099a7c8265a16a4344f43f952c03878cc8f09
解密结果：这是一段中文明文

以上就是Java实现的AES加密算法完整实例的攻略，包括了生成密钥、加密和解密三个步骤，并且给出了两个示例，一个是英文明文，一个是中文明文。