C#将字母或数字加密成字母的方法

本文实例讲述了c#将字母或数字加密成字母的方法。分享给大家供大家参考。具体实现方法如下：

public class md5
{
        static list<keyvaluepair<char, char>> mappinglist;
        #region 加密      public static string encrypt(string str)
        /// <summary>
        /// 加密
        /// </summary>
        /// <param name="str">要加密的字符串</param>
        /// <returns>返回结果的字符串</returns>
        public static string encrypt(string str)
        {
            mappinglist = new list<keyvaluepair<char, char>>();
            for (char c = '0'; c <= '9'; c++)
                mappinglist.add(new keyvaluepair<char, char>(c, (char)(c - '0' + 'a')));
            for (char c = 'a'; c <= 'f'; c++)
                mappinglist.add(new keyvaluepair<char, char>(c, (char)(c - 'a' + 'u')));
            return encoding.ascii.getbytes(str)
                .select((b, i) => (b ^ ((byte)(0xa0 + i))).tostring("x2"))
                .aggregate("", (s, c) => s + c)
                .tochararray().select(c => mappinglist.first(kv => kv.key == c).value)
                .aggregate("", (s, c) => s + c);
        }
        #endregion
        #region 解密       public static string decrypt(string str)
        /// <summary>
        /// 解密
        /// </summary>
        /// <param name="str">解密的字符串</param>
        /// <returns>返回结果字符串</returns>
        public static string decrypt(string str)
        {
            string base16 = str.tochararray()
                .select(c => mappinglist.first(kv => kv.value == c).key)
                .aggregate("", (s, c) => s + c);
            return encoding.ascii.getstring((new byte[base16.length / 2])
                .select((b, i) => (byte)(convert.tobyte(base16.substring(i * 2, 2), 16) ^ ((byte)(0xa0 + i)))).toarray());
        }
        #endregion
}

希望本文所述对大家的c#程序设计有所帮助。