MD5 加盐（Java）
本文转载自：https://blog.csdn.net/dingsai88/article/details/51637977
jar：https://pan.baidu.com/s/1-8JaRoUtzc1fV8lqhFCBoA
1 package util; 2 3 import java.security.MessageDigest; 4 import java.security.NoSuchAlgorithmException; 5 import java.util.Random; 6 7 import org.apache.commons.codec.binary.Hex; 8 9 public class MD5Util { 10 /** 11 * 普通MD5 12 * 13 * @author daniel 14 * @time 2016-6-11 下午8:00:28 15 * @param inStr 16 * @return 17 */ 18 public static String MD5(String input) { 19 MessageDigest md5 = null; 20 try { 21 md5 = MessageDigest.getInstance("MD5"); 22 } catch (NoSuchAlgorithmException e) { 23 return "check jdk"; 24 } catch (Exception e) { 25 e.printStackTrace(); 26 return ""; 27 } 28 char[] charArray = input.toCharArray(); 29 byte[] byteArray = new byte[charArray.length]; 30 31 for (int i = 0; i < charArray.length; i++) 32 byteArray[i] = (byte) charArray[i]; 33 byte[] md5Bytes = md5.digest(byteArray); 34 StringBuffer hexValue = new StringBuffer(); 35 for (int i = 0; i < md5Bytes.length; i++) { 36 int val = ((int) md5Bytes[i]) & 0xff; 37 if (val < 16) 38 hexValue.append("0"); 39 hexValue.append(Integer.toHexString(val)); 40 } 41 return hexValue.toString(); 42 43 } 44 45 /** 46 * 加盐MD5 47 * 48 * @author daniel 49 * @time 2016-6-11 下午8:45:04 50 * @param password 51 * @return 52 */ 53 public static String generate(String password) { 54 Random r = new Random(); 55 StringBuilder sb = new StringBuilder(16); 56 sb.append(r.nextInt(99999999)).append(r.nextInt(99999999)); 57 int len = sb.length(); 58 if (len < 16) { 59 for (int i = 0; i < 16 - len; i++) { 60 sb.append("0"); 61 } 62 } 63 String salt = sb.toString(); 64 password = md5Hex(password + salt); 65 char[] cs = new char[48]; 66 for (int i = 0; i < 48; i += 3) { 67 cs[i] = password.charAt(i / 3 * 2); 68 char c = salt.charAt(i / 3); 69 cs[i + 1] = c; 70 cs[i + 2] = password.charAt(i / 3 * 2 + 1); 71 } 72 return new String(cs); 73 } 74 75 /** 76 * 校验加盐后是否和原文一致 77 * 78 * @author daniel 79 * @time 2016-6-11 下午8:45:39 80 * @param password 81 * @param md5 82 * @return 83 */ 84 public static boolean verify(String password, String md5) { 85 char[] cs1 = new char[32]; 86 char[] cs2 = new char[16]; 87 for (int i = 0; i < 48; i += 3) { 88 cs1[i / 3 * 2] = md5.charAt(i); 89 cs1[i / 3 * 2 + 1] = md5.charAt(i + 2); 90 cs2[i / 3] = md5.charAt(i + 1); 91 } 92 String salt = new String(cs2); 93 return md5Hex(password + salt).equals(new String(cs1)); 94 } 95 96 /** 97 * 获取十六进制字符串形式的MD5摘要 98 */ 99 private static String md5Hex(String src) { 100 try { 101 MessageDigest md5 = MessageDigest.getInstance("MD5"); 102 byte[] bs = md5.digest(src.getBytes()); 103 return new String(new Hex().encode(bs)); 104 } catch (Exception e) { 105 return null; 106 } 107 } 108 109 public static void main(String[] args) { 110 String text = "zxcvbnm"; 111 System.out.println("原始的：" + MD5(text)); 112 System.out.println("加盐后：" + generate(text)); 113 114 System.out.println("比较后：" + verify("zxcvbnm0", generate(text))); 115 116 //tempSalt 某一次加盐后的值 117 String[] tempSalt = { 118 "66b120750d59952c8755b66eb3f59242e95ba51d2648bb09", 119 "e58361192f98839e10c6b64ce8b688301b4e722a8f672505", 120 "52817d504304212a46f58f81b9bd42a57f2468fc73b79b61" 121 }; 122 123 for (String temp : tempSalt) { 124 System.out.println("是否是同一字符串:" + verify("zxcvbnm", temp)); 125 } 126 } 127 }
