Get SHA256 Hash : Hash « Security « C# / C Sharp

1. C# / C Sharp
2. Security
3. Hash

Get SHA256 Hash

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Script.Serialization;
using System.Text;
using System.Text.RegularExpressions;
using System.Net;
using System.Globalization;
using System.Security.Cryptography;

namespace WeBlog {
  public static class Utils {
    public static double CalculateRating(int raters, double rating, double newRating) {
      double calcRating = ((rating * raters) + newRating) / (raters + 1);
      calcRating = Math.Floor((calcRating * 2) + .5) / 2;
      return calcRating;
    }

    public static string GetMD5Hash(string input) {
            if (String.IsNullOrWhiteSpace(input))
                return String.Empty;

      // step 1, calculate MD5 hash from input
      MD5 md5 = System.Security.Cryptography.MD5.Create();
      byte[] inputBytes = System.Text.Encoding.ASCII.GetBytes(input);
      byte[] hash = md5.ComputeHash(inputBytes);

      // step 2, convert byte array to hex string
      StringBuilder sb = new StringBuilder();
      for (int i = 0; i < hash.Length; i++) {
        sb.Append(hash[i].ToString("x2"));
      }
      return sb.ToString();
    }

    public static string GetSummary(string html, int length ) {
      string text = Utils.StripHtml(html);
      if (text.Length > length) {
        text = text.Substring(0, length) + " ...";
        text = "\"" + text.Trim() + "\"";
      }
      return text;
    }

    public static string GetSHA256Hash(string input) {
      byte[] data = Encoding.UTF8.GetBytes(input);
      using (HashAlgorithm sha = new SHA256Managed()) {
        byte[] encryptedBytes = sha.TransformFinalBlock(data, 0, data.Length);
        return Convert.ToBase64String(sha.Hash);
      }
    }

    public static string RemoveIllegalCharacters(string text) {
      if (string.IsNullOrEmpty(text))
        return text;

      text = text.Replace(":", string.Empty);
      text = text.Replace("/", string.Empty);
      text = text.Replace("?", string.Empty);
      text = text.Replace("#", string.Empty);
      text = text.Replace("[", string.Empty);
      text = text.Replace("]", string.Empty);
      text = text.Replace("@", string.Empty);
      text = text.Replace("*", string.Empty);
      text = text.Replace(".", string.Empty);
      text = text.Replace(",", string.Empty);
      text = text.Replace("\"", string.Empty);
      text = text.Replace("&", string.Empty);
      text = text.Replace("'", string.Empty);
      text = text.Replace(" ", "-");
      text = RemoveDiacritics(text);
      text = RemoveExtraHyphen(text);

      return HttpUtility.UrlEncode(text).Replace("%", string.Empty);
    }

    private static string RemoveExtraHyphen(string text) {
      if (text.Contains("--")) {
        text = text.Replace("--", "-");
        return RemoveExtraHyphen(text);
      }

      return text;
    }

    private static String RemoveDiacritics(string text) {
      String normalized = text.Normalize(NormalizationForm.FormD);
      StringBuilder sb = new StringBuilder();

      for (int i = 0; i < normalized.Length; i++) {
        Char c = normalized[i];
        if (CharUnicodeInfo.GetUnicodeCategory(c) != UnicodeCategory.NonSpacingMark)
          sb.Append(c);
      }

      return sb.ToString();
    }

    private static Regex _Regex = new Regex("<[^>]*>", RegexOptions.Compiled);
    /// <summary>
    /// Removes all HTML tags from a given string
    /// </summary>
    public static string StripHtml(string html) {
      if (string.IsNullOrEmpty(html))
        return string.Empty;

      return _Regex.Replace(html, string.Empty);
    }

        public static event EventHandler<EventArgs> OnLog;
        public static void Log(object message)
        {
            if (OnLog != null)
            {
                OnLog(message, new EventArgs());
            }
        }

        public static void Log(string methodName, Exception ex)
        {
            Log(String.Format("{0}: {1}", methodName, ex.Message));
        }
  }
}

   
  

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