两次MD5增强密码安全性

    <dependency>
        <groupId>commons-codec</groupId>
        <artifactId>commons-codec</artifactId>
    </dependency>
    <dependency>
        <groupId>org.apache.commons</groupId>
        <artifactId>commons-lang3</artifactId>
        <version>3.6</version>
    </dependency>
    

public class MD5Util {
	
	public static String md5(String src) {
		return DigestUtils.md5Hex(src);
	}
	
	private static final String salt = "1a2b3c4d";
	
	public static String inputPassToFormPass(String inputPass) {
		String str = ""+salt.charAt(0)+salt.charAt(2) + inputPass +salt.charAt(5) + salt.charAt(4);
		return md5(str);
	}
	
	public static String formPassToDBPass(String formPass, String salt) {
		String str = ""+salt.charAt(0)+salt.charAt(2) + formPass +salt.charAt(5) + salt.charAt(4);
		return md5(str);
	}
	
	public static String inputPassToDbPass(String inputPass, String saltDB) {
		String formPass = inputPassToFormPass(inputPass);
		String dbPass = formPassToDBPass(formPass, saltDB);
		return dbPass;
	}
	
}