AESUtil Java AES 加密解密工具类

待我称王封你为后i 2022-04-11 12:49 272阅读 0赞

package com.singlee.util;
    
    import javax.crypto.Cipher;
    import javax.crypto.spec.IvParameterSpec;
    import javax.crypto.spec.SecretKeySpec;
    
    import org.apache.commons.net.util.Base64;
    
    /**
     * AES工具类
     * 
     * <pre>
     *   因为某些国家的进口管制限制，Java发布的运行环境包中的加解密有一定的限制。比如默认不允许256位密钥的AES加解密，解决方法就是修改策略文件。
     *   替换的文件：%JDK_HOME%\jre\lib\security\local_policy.jar
     * 参考： http://czj4451.iteye.com/blog/1986483
     */
    public class AESUtil {
    	// 密钥
    	public static String key = "AD42F6697B035B7580E4FEF93BE20BAD";
    	private static String charset = "utf-8";
    	// 偏移量
    	private static int offset = 16;
    	private static String transformation = "AES/CBC/PKCS5Padding";
    	private static String algorithm = "AES";
    
    	/**
    	 * 加密
    	 * 
    	 * @param content
    	 * @return
    	 */
    	public static String encrypt(String content) {
    		return encrypt(content, key);
    	}
    
    	/**
    	 * 解密
    	 * 
    	 * @param content
    	 * @return
    	 */
    	public static String decrypt(String content) {
    		return decrypt(content, key);
    	}
    
    	/**
    	 * 加密
    	 * 
    	 * @param content
    	 *            需要加密的内容
    	 * @param key
    	 *            加密密码
    	 * @return
    	 */
    	public static String encrypt(String content, String key) {
    		try {
    			SecretKeySpec skey = new SecretKeySpec(key.getBytes(), algorithm);
    			IvParameterSpec iv = new IvParameterSpec(key.getBytes(), 0, offset);
    			Cipher cipher = Cipher.getInstance(transformation);
    			byte[] byteContent = content.getBytes(charset);
    			cipher.init(Cipher.ENCRYPT_MODE, skey, iv);// 初始化
    			byte[] result = cipher.doFinal(byteContent);
    			return new Base64().encodeToString(result); // 加密
    		} catch (Exception e) {
    			LogUtil.exception(e);
    		}
    		return null;
    	}
    
    	/**
    	 * AES（256）解密
    	 * 
    	 * @param content
    	 *            待解密内容
    	 * @param key
    	 *            解密密钥
    	 * @return 解密之后
    	 * @throws Exception
    	 */
    	public static String decrypt(String content, String key) {
    		try {
    
    			SecretKeySpec skey = new SecretKeySpec(key.getBytes(), algorithm);
    			IvParameterSpec iv = new IvParameterSpec(key.getBytes(), 0, offset);
    			Cipher cipher = Cipher.getInstance(transformation);
    			cipher.init(Cipher.DECRYPT_MODE, skey, iv);// 初始化
    			byte[] result = cipher.doFinal(new Base64().decode(content));
    			return new String(result); // 解密
    		} catch (Exception e) {
    			LogUtil.exception(e);
    		}
    		return null;
    	}
    
    	public static void main(String[] args) throws Exception {
    		String s = "hello world";
    		// 加密
    		System.out.println("加密前：" + s);
    		String encryptResultStr = encrypt(s);
    		System.out.println("加密后：" + encryptResultStr);
    		// 解密
    		System.out.println("解密后：" + decrypt(encryptResultStr));
    	}
    }

注：加解密只需替换 %JDK\_HOME%\\jre\\lib\\security\\local\_policy.jar 即可（注意备份）

附件：[java1.7的策略文件][java1.7]

其他java版本请参考： [http://czj4451.iteye.com/blog/1986483][http_czj4451.iteye.com_blog_1986483]

[java1.7]: http://dl.iteye.com/topics/download/f577747b-9bae-3a74-aaa8-6247ccb60ad7
[http_czj4451.iteye.com_blog_1986483]: http://czj4451.iteye.com/blog/1986483