Applies the HMAC-MD5 keyed algorithm to the given string using the given key. - CSharp System.Security.Cryptography

CSharp examples for System.Security.Cryptography:MD5

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Description

Applies the HMAC-MD5 keyed algorithm to the given string using the given key.

Demo Code

// MailSystem.NET is free software; you can redistribute it and/or modify

public class Main{
        /// <summary>
      /// Applies the HMAC-MD5 keyed algorithm to the given string using the given key.
      /// </summary>
      /// <param name="key">The key to be used.</param>
      /// <param name="data">The data to be digested.</param>
      /// <remarks>This method is used for CRAM-MD5 authentication.</remarks>
      /// <returns>The transformed data as a 16 bytes digest.</returns>
      /// <example>
      /// The example below illustrates the use of this method.
      /// /*w w  w  .  ja  va 2s.c o m*/
      /// <code>
      /// C#
      /// 
      /// string key = "key";
      /// string data = "ActiveMail rocks ! Let's see how this string is digested...";
      /// string digest = Crypto.HMACMD5Digest(key,data);
      /// </code>
      /// 
      /// digest returns 5db4f178a3ff817a9bc1092a2bcdda24
      /// 
      /// Digesting is used to check data equivalence.
      /// Different data result in different digests.
      /// </example>
      public static string HMACMD5Digest(string key, string data)
      {
         System.Security.Cryptography.MD5CryptoServiceProvider md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
         if(key.Length>64) key = ActiveUp.Net.Mail.Crypto.MD5Digest(key);
         key = key.PadRight(64,'\0');
         byte[] bkey = System.Text.Encoding.ASCII.GetBytes(key);
         for(int i=0;i<64;i++) bkey[i] ^= 0x36;
         byte[] bdata = System.Text.Encoding.ASCII.GetBytes(data);
         byte[] bresult = new byte[bdata.Length+64];
         for(int i=0;i<64;i++) bresult[i] = bkey[i];
         for(int i=64;i<bresult.Length;i++) bresult[i] = bdata[i-64];
         byte[] buf = md5.ComputeHash(bresult);
         bkey = System.Text.Encoding.ASCII.GetBytes(key);
         for(int i=0;i<64;i++) bkey[i] ^= 0x5C;
         byte[] bres = new byte[buf.Length+64];
         for(int i=0;i<64;i++) bres[i] = bkey[i];
         for(int i=64;i<bres.Length;i++) bres[i] = buf[i-64];;
         return System.BitConverter.ToString(md5.ComputeHash(bres)).ToLower().Replace("-","");
      }
        /// <summary>
      /// Digests the given string using the MD5 algorithm.
      /// </summary>
      /// <param name="data">The data to be digested.</param>
      /// <remarks>This method is used for APOP authentication.</remarks>
      /// <returns>A 16 bytes digest representing the data.</returns>
      /// <example>
      /// The example below illustrates the use of this method.
      /// 
      /// <code>
      /// C#
      /// 
      /// string data = "ActiveMail rocks ! Let's see how this string is digested...";
      /// string digest = Crypto.MD5Digest(data);
      /// </code>
      /// 
      /// digest returns 3ff3501885f8602c4d8bf7edcd2ceca1
      /// 
      /// Digesting is used to check data equivalence.
      /// Different data result in different digests.
      /// </example>
      public static string MD5Digest(string data)
      {
         System.Security.Cryptography.MD5CryptoServiceProvider md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
         byte[] bufe = md5.ComputeHash(System.Text.Encoding.ASCII.GetBytes(data));
         return System.BitConverter.ToString(bufe).ToLower().Replace("-","");
      }
}

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