MD5加密教程：简单实现与校验

    /// <summary>
    /// MD5加密类
    /// </summary>
    public class MD5
    {
        /// <summary>
        /// 取得输入字符串的MD5哈希值
        /// </summary>
        /// <param name="argInput">输入字符串</param>
        /// <returns>MD5哈希值</returns>
        public static string getMd5Hash(string argInput)
        {
            // Create a new instance of the MD5CryptoServiceProvider object.
            MD5 md5Hasher = MD5.Create();

            // Convert the input string to a byte array and compute the hash.
            byte[] data = md5Hasher.ComputeHash(Encoding.Default.GetBytes(argInput));

            // Create a new Stringbuilder to collect the bytes
            // and create a string.
            StringBuilder sBuilder = new StringBuilder();

            // Loop through each byte of the hashed data 
            // and format each one as a hexadecimal string.
            for (int i = 0; i < data.Length; i++)
            {
                sBuilder.Append(data[i].ToString("x2"));
            }