How do I use Sha256 to Encrypt a String? RSS

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  jcjcjc

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  How do I use Sha256 to Encrypt a String?

  Jan 28, 2008 05:35 AM|LINK

  I need to Encrypt a string,  can you please direct me a reference information how to do?
  

  thank you very much 

  • Moved by vcsjones on Jan 28, 2008 05:49 AM
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  vivek_iit

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  Re: How do I use Sha256 to Encrypt a String?

  Jan 28, 2008 06:00 AM|LINK

   Hi,
  
  There are many online samples which you can refer to, like:
  
  http://www.obviex.com/samples/hash.aspx
  
  http://cs.thycotic.net/blogs/shiva_adhikari/archive/2006/09/09/SHA1_2C00_-MD5_2C00_-SHA256-and-some-C_2300_-code-snippet.aspx
  
  
  Hope this helps,
  
  Vivek
  
  
  
  
  
  

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  • Marked as answer by XiaoYong Dai – MSFT on Feb 01, 2008 05:45 AM
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  realfantasy

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  Re: How do I use Sha256 to Encrypt a String?

  Jan 28, 2008 06:03 AM|LINK

   http://www.experts-exchange.com/Programming/Languages/.NET/Visual_Basic.NET/Q_22134135.html

  sample code by the ref: http://www.htmlforums.com/asp-and-aspnet/t-sha256-encryption-in-aspnet-20-83659.html
  

  Public Function EncryptSHA256Managed(ByVal ClearString As String) As String
          Dim uEncode As New UnicodeEncoding()
          Dim bytClearString() As Byte = uEncode.GetBytes(ClearString)
          Dim sha As New _
          System.Security.Cryptography.SHA256Managed()
          Dim hash() As Byte = sha.ComputeHash(bytClearString)
          Return Convert.ToBase64String(hash)
      End Function

   

  • Marked as answer by XiaoYong Dai – MSFT on Feb 01, 2008 05:45 AM
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  jcjcjc

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  Re: How do I use Sha256 to Encrypt a String?

  Jan 28, 2008 06:27 AM|LINK

  thank you , I am studying http://www.obviex.com/samples/hash.aspx

  do you mind offer me a code of C# type ?

  again really thanks for your help
  

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  jcjcjc

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  Re: How do I use Sha256 to Encrypt a String?

  Jan 28, 2008 06:30 AM|LINK

  sorry for asking again

  about this article

  http://www.obviex.com/samples/hash.aspx which said Hash Data with Salt..

  what is salt? do I create it by myself? thank you
  
   

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  vivek_iit

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  Re: How do I use Sha256 to Encrypt a String?

  Jan 28, 2008 06:43 AM|LINK

  http://en.wikipedia.org/wiki/Salt_(cryptography)

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  • Marked as answer by XiaoYong Dai – MSFT on Feb 01, 2008 05:44 AM
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  jcjcjc

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  Re: How do I use Sha256 to Encrypt a String?

  Jan 28, 2008 07:46 AM|LINK

    I just found out this simple example and it works for me
    can you please teach me from this code? because I can't really understand Sha256 by this code
   
    why this code create 2 Byte (sha256Bytes and cryString) array?  what is the difference between each other and what use for?
   
    and why cryString[i].Tostring("X")?  what does the X mean?
   
   
          System.Security.Cryptography.SHA256 sha256 = new System.Security.Cryptography.SHA256Managed();
              byte[] sha256Bytes = System.Text.Encoding.Default.GetBytes(rawString);
              byte[] cryString = sha256.ComputeHash(sha256Bytes);
              string sha256Str = string.Empty;
              for (int i=0;i<cryString.Length;i++)
              {
                  sha256Str += cryString[i].ToString("X");
              }
              return sha256Str;

   

   

  another question ... what the difference if we have salt or not?
             
              thank you very much
  

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  XiaoYong Dai...

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  Re: How do I use Sha256 to Encrypt a String?

  Jan 30, 2008 07:14 AM|LINK

  jcjcjc

   and why cryString[i].Tostring("X")?  what does the X mean?
  

  Hi

  X mean format string, output to Hexadecimal 

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  XiaoYong Dai
  Microsoft Online Community Support
  
  Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.
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  ashish-1983

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  Re: How do I use Sha256 to Encrypt a String?

  Oct 23, 2009 05:22 PM|LINK

  jcjcjc

    I just found out this simple example and it works for me
    can you please teach me from this code? because I can't really understand Sha256 by this code
   
    why this code create 2 Byte (sha256Bytes and cryString) array?  what is the difference between each other and what use for?
   
    and why cryString[i].Tostring("X")?  what does the X mean?
   
   
          System.Security.Cryptography.SHA256 sha256 = new System.Security.Cryptography.SHA256Managed();
              byte[] sha256Bytes = System.Text.Encoding.Default.GetBytes(rawString);
              byte[] cryString = sha256.ComputeHash(sha256Bytes);
              string sha256Str = string.Empty;
              for (int i=0;i<cryString.Length;i++)
              {
                  sha256Str += cryString[i].ToString("X");
              }
              return sha256Str;

  
  

  
  

  another question ... what the difference if we have salt or not?
             
              thank you very much
  

  
  

  dude you are my Hero...

  thnx

  
  

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  ashish-1983

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  Re: How do I use Sha256 to Encrypt a String?

  Oct 24, 2009 09:37 AM|LINK

  can u tell me which is the best algorithm

  MD5, SHA1, SHA256, SHA384, SHA 512..

  i want to implement this for password security..

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