Hello

hashalgorithm() doesn't have computeHase() in .Net 2.0. Instead,

cryptography.sha512()

has computeHash(). I am not sure the two methods in two framworks return
same value.

Hi,

I use System.Security.Cryptography.HashAlgorithm.ComputeHash() method
with SHA512 to encrypt password.

I recently upgrade my website from .Net 1.1 to .Net 2.0. The passwords stop
working.

Would you please tell me if the
System.Security.Cryptography.HashAlgorithm.ComputeHash()
generate exact same hash code in both versions of .Net for the same given
byte[]?

If the method in 2 versions indeed generate different hash code,
Thank you

hb

Hi,

Nothing has (as one would expect) changed:

http://msdn2.microsoft.com/en-us/library/s02tk69a(VS.80).aspx
http://msdn2.microsoft.com/en-us/library/system.security.cryptography.sha512(vs.
80).aspx

How are you calculating the hash? A simple way:

using System;
using System.Security.Cryptography;
using System.Text;

class test {
 public static void Main() {
   byte[] sha512 = new SHA512Managed()
     .ComputeHash(new UTF8Encoding().GetBytes("string"));
   StringBuilder sb  = new StringBuilder();
   foreach (byte hex in sha512) sb.Append(hex.ToString("x2"));
   Console.WriteLine( sb.ToString() );
 }
}

HTH - keith

Hi, Han and Keith,

I tried the following code in both .Net 1.1 and 2.0:
==
string s1="abc";

//convert string to byte[]
byte[] bh=Encoding.ASCII.GetBytes(s);

SHA512 sh = new SHA512Managed();

//calculate hash
byte[] r=sh.ComputeHash(bh);

//convert byte[] to string
string s2=Encoding.ASCII.GetString(r);

Response.Write("output="+s2);
==
Here you are the output:
***
.Net 1.1: output=]/5!az:LAsI. A1fzN )~" nfKUS!*'OA(6:<##~k=EMD#d

.Net 2.0: output=??5??az??AsI? A1??N??~? ???KU??!??*'O??6?<#????EMD#d
***

One thing in common is that they all contain 53 characters, but they are not same string.
 Hi,

 I use System.Security.Cryptography.HashAlgorithm.ComputeHash() method
 with SHA512 to encrypt password.

 I recently upgrade my website from .Net 1.1 to .Net 2.0. The passwords stop working.

 Would you please tell me if the System.Security.Cryptography.HashAlgorithm.ComputeHash()
 generate exact same hash code in both versions of .Net for the same given byte[]?

 If the method in 2 versions indeed generate different hash code,
 Thank you

 hb