MD5

MD5

    public class MD5Util {

/**
 * 普通MD5加密
 * @param input
 * @return
 */
public static String MD5(String input) {
    MessageDigest md5 = null;
    try {
        md5 = MessageDigest.getInstance("MD5");
    } catch (NoSuchAlgorithmException e) {
        return "check jdk";
    } catch (Exception e) {
        e.printStackTrace();
        return "";
    }
    char[] charArray = input.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();

}

/**
 * MD5加盐
 * @param password
 * @return
 */
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);
}

/**
 * 校验加盐后是否和原文一致
 * @param password
 * @param md5
 * @return
 */
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
 */
private 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;
    }
}




    }