com.scudata.common.Pwd Maven / Gradle / Ivy

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SPL(Structured Process Language) A programming language specially for structured data computing.

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package com.scudata.common;

/**
 * ???ܽ??ܹ?????
 *
 */
public class Pwd implements IPwd {
	/**
	 * ????
	 * 
	 * @param pwd
	 *            Դ????
	 * @return ???ܺ??????
	 */
	public String encrypt(String pwd) {
		if (pwd == null)
			return null;
		int len = pwd.length();
		StringBuffer sb = new StringBuffer(2 * len + 2);
		for (int i = 0; i < len; i++) {
			char c = pwd.charAt(i);
			sb.append((char) ('a' + ((c >>> 12) & 0xf)));
			sb.append((char) ('a' + ((c >>> 8) & 0xf)));
			sb.append((char) ('a' + ((c >>> 4) & 0xf)));
			sb.append((char) ('a' + (c & 0xf)));
		}
		return sb.toString();
	}

	/**
	 * ????
	 * 
	 * @param pwd
	 *            ???ܺ??????
	 * @return Դ????
	 */
	public String decrypt(String pwd) {
		if (pwd == null)
			return null;
		int len = pwd.length();
		if (len % 4 != 0)
			throw new RuntimeException("error encrypted password");
		StringBuffer sb = new StringBuffer(len / 4);
		for (int i = 0; i < len / 4; i++) {
			char c = (char) (((pwd.charAt(4 * i) - 'a') & 0xf) << 12);
			c += (char) (((pwd.charAt(4 * i + 1) - 'a') & 0xf) << 8);
			c += (char) (((pwd.charAt(4 * i + 2) - 'a') & 0xf) << 4);
			c += (char) ((pwd.charAt(4 * i + 3) - 'a') & 0xf);
			sb.append(c);
		}
		return sb.toString();
	}

}