C# Md5 vs MD5sum

[chis2k]

I am trying to figure out how to get the MD5 sum of a file that is like the
result from the MD5sum.exe program that is readily available on the
internet. I tried the following but it gives me something completely
different.... Any ideas?

MD5sum.exe output = c37a2719bd83ba7 66b29d8f83cee62 58
My program output = w3onGb2DunZrKdj 4PO5iWA==

public string GetMD5Hash( byte[] input_buffer) {
// create implementation of MD5
MD5 md5 = new MD5CryptoServic eProvider();
// get hash
return System.Convert. ToBase64String( md5.ComputeHash (input_buffer)) ;
}

[Jon Skeet]

chis2k <sf*@sdf.com> wrote:

I am trying to figure out how to get the MD5 sum of a file that is like the
result from the MD5sum.exe program that is readily available on the
internet. I tried the following but it gives me something completely
different.... Any ideas?

MD5sum.exe output = c37a2719bd83ba7 66b29d8f83cee62 58
My program output = w3onGb2DunZrKdj 4PO5iWA==

public string GetMD5Hash( byte[] input_buffer) {
// create implementation of MD5
MD5 md5 = new MD5CryptoServic eProvider();
// get hash
return System.Convert. ToBase64String( md5.ComputeHash (input_buffer)) ;
}

You're assuming that the result of MD5sum is the Base64 result - it
looks more like hex to me. Indeed, if you try the following program
which converts your base64 to hex, you'll see a familiar sequence...

using System;

public class Test
{
static void Main()
{
byte[] md5 = Convert.FromBas e64String
("w3onGb2DunZrK dj4PO5iWA==");
Console.WriteLi ne (BitConverter.T oString(md5));
}
}

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet/
If replying to the group, please do not mail me too

[chis2k]

Thanks! That was it!

"Jon Skeet" <sk***@pobox.co m> wrote in message
news:MP******** *************** *@news.microsof t.com...

chis2k <sf*@sdf.com> wrote:

I am trying to figure out how to get the MD5 sum of a file that is like the result from the MD5sum.exe program that is readily available on the
internet. I tried the following but it gives me something completely
different.... Any ideas?

MD5sum.exe output = c37a2719bd83ba7 66b29d8f83cee62 58
My program output = w3onGb2DunZrKdj 4PO5iWA==

public string GetMD5Hash( byte[] input_buffer) {
// create implementation of MD5
MD5 md5 = new MD5CryptoServic eProvider();
// get hash
return System.Convert. ToBase64String( md5.ComputeHash (input_buffer)) ;
}

You're assuming that the result of MD5sum is the Base64 result - it
looks more like hex to me. Indeed, if you try the following program
which converts your base64 to hex, you'll see a familiar sequence...

using System;

public class Test
{
static void Main()
{
byte[] md5 = Convert.FromBas e64String
("w3onGb2DunZrK dj4PO5iWA==");
Console.WriteLi ne (BitConverter.T oString(md5));
}
}

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet/
If replying to the group, please do not mail me too