JAVA MD5 加密与解密

Bertha 。 2022-07-17 04:26 226阅读 0赞

package test;
    
    import java.security.MessageDigest;
    
    public class Test {
        
    
        /*** 
         * 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("tuang");  
            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)));  
    
        }  
    
    }