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  • Java项目密码做MD5加密处理

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    package cn.ljs.util;
    
    import java.security.MessageDigest;
    import java.security.NoSuchAlgorithmException;
    import java.util.Random;
    
    import org.apache.commons.codec.binary.Hex;
    
    /**
     * MD5加盐加密
     * @author Administrator
     *
     */
    public class MD5 {
        
        public static String makeMD5(String plainText) {
            plainText=plainText+"A";//A是自定义盐值,随便填什么都可以
            try {  
                MessageDigest md = MessageDigest.getInstance("MD5");  
                md.update(plainText.getBytes());  
               byte b[] = md.digest();  
               int i;  
               StringBuffer buf = new StringBuffer("");  
               for (int offset = 0; offset < b.length; offset++) {  
                   i = b[offset];  
                   if (i < 0)  
                       i += 256;  
                   if (i < 16)  
                       buf.append("0C");  
                   buf.append(Integer.toHexString(i));  
               }  
               //32位加密  
               return buf.toString();  
               // 16位的加密  
               //return buf.toString().substring(8, 24);  
           } catch (NoSuchAlgorithmException e) {  
               e.printStackTrace();  
               return null;  
           }  
       }
        
        /**
         * 生成含有随机盐的密码
         */
    /*    public static String generate(String password) {
            Random r = new Random();
            StringBuilder sb = new StringBuilder(16);
            sb.append(r.nextInt(99999999)).append(r.nextInt(99999999));
            int len = sb.length();
            if (len < 16) {
                for (int i = 0; i < 16 - len; i++) {
                    sb.append("0");
                }
            }
            String salt = sb.toString();
            password = md5Hex(password + salt);
            char[] cs = new char[48];
            for (int i = 0; i < 48; i += 3) {
                cs[i] = password.charAt(i / 3 * 2);
                char c = salt.charAt(i / 3);
                cs[i + 1] = c;
                cs[i + 2] = password.charAt(i / 3 * 2 + 1);
            }
            return new String(cs);
        }*/
        /**
         * 校验密码是否正确
         */
    /*    public static boolean verify(String password, String md5) {
            char[] cs1 = new char[32];
            char[] cs2 = new char[16];
            for (int i = 0; i < 48; i += 3) {
                cs1[i / 3 * 2] = md5.charAt(i);
                cs1[i / 3 * 2 + 1] = md5.charAt(i + 2);
                cs2[i / 3] = md5.charAt(i + 1);
            }
            String salt = new String(cs2);
            return md5Hex(password + salt).equals(new String(cs1));
        }*/
        /**
         * 获取十六进制字符串形式的MD5摘要
         */
    /*    public static String md5Hex(String src) {
            try {
                MessageDigest md5 = MessageDigest.getInstance("MD5");
                byte[] bs = md5.digest(src.getBytes());
                return new String(new Hex().encode(bs));
            } catch (Exception e) {
                return null;
            }
        }*/
    
    
    }
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  • 原文地址:https://www.cnblogs.com/ljmm/p/12597573.html
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