Md5加密解密工具

爱被打了一巴掌 2021-12-13 14:41 329阅读 0赞

package cn.demo.file;
    
    import java.security.MessageDigest;
    
    public class MD5Utils {
    
    	/***
    	 * MD5加码 生成32位md5码
    	 */
    	public static String string2MD5(String inStr) {
    		MessageDigest md5 = null;
    		try {
    			md5 = MessageDigest.getInstance("MD5");
    		} catch (Exception e) {
    			System.out.println(e.toString());
    			e.printStackTrace();
    			return "";
    		}
    		char[] charArray = inStr.toCharArray();
    		byte[] byteArray = new byte[charArray.length];
    
    		for (int i = 0; i < charArray.length; i++)
    			byteArray[i] = (byte) charArray[i];
    		byte[] md5Bytes = md5.digest(byteArray);
    		StringBuffer hexValue = new StringBuffer();
    		for (int i = 0; i < md5Bytes.length; i++) {
    			int val = ((int) md5Bytes[i]) & 0xff;
    			if (val < 16)
    				hexValue.append("0");
    			hexValue.append(Integer.toHexString(val));
    		}
    		return hexValue.toString();
    	}
    
    	/**
    	 * 加密解密算法 执行一次加密，两次解密
    	 */
    	public static String convertMD5(String inStr) {
    		char[] a = inStr.toCharArray();
    		for (int i = 0; i < a.length; i++) {
    			a[i] = (char) (a[i] ^ 't');
    		}
    		String s = new String(a);
    		return s;
    	}
    
    	// 测试主函数
    	public static void main(String args[]) {
    		//String s = new String("1111");
    		//String s = new String("123456");
    		String s = new String("789ABCabc159");
    		System.out.println("原始：" + s);
    		System.out.println("MD5后：" + string2MD5(s));
    		System.out.println("加密的：" + convertMD5(s));
    		System.out.println("解密的：" + convertMD5(convertMD5(s)));
    	}
    
    }