加密工具类

文章目录

public class CipherUtil {
	private final static String[] hexDigits = {"0", "1", "2", "3", "4","5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"};   
    
    public static String generatePassword(String inputString){
        return encodeByMD5(inputString);
    }
    
    // 判断是否与处理后的加密码匹配
    public static boolean validatePassword(String password,String inputString){
        if(password.equals(encodeByMD5(inputString)){
            return true;
        } else {
            return false;
        }
    }
    
    private static String encodeByMD5(String originString){
        if (originString != null) {
            try{
                 // 创建指定算法获取信息摘要
                 MessageDigest md = MessageDigest.getInstance("MD5"); 
                 // 获取字符串的照耀
                 byte[] results = md.digest(originString.getBytes());
                 String resultString = byteArrayToHexString(result);
                 return resultString.toUpperCase();
            } catch(Exception e) {
                e.printStackTrace();
            }
        }
        return null;
    }
    
    // byte[] -> String
    private static String byteArrayToHexString(byte[] b) {
        StringBuffer resultSb = new StringBuffer();
        for (int i = 0; i < b.length; i++){
            resultSb.append(byteToHexString(b[i]));
        }
        return resultSb.toString();
    }
    
    // byte -> String
    private static String byteToHexString(byte b) {
        int n = b;
        if (n < 0) 
            n = 256 + n;
        int d1 = n / 16;
        int d2 = n % 16;
        return hexDigits[d1] + hexDigits[d2];
    }
}