SHA1 hash computation not returing same result for java and c#

Question

I am computing hash in my .net and Java application.But I got a problem when they gave me result because both are giving different results.While searching about this problem, I found these questions
question 1 and question 2 so applied there according tho their answers but unfortunately i didn't get success.I also tried UTF-8 and UTF-16LE but result was again not same.
Now I am stuck and want to know why it is happening and How can I solve this
My code snippet is given below
.Net

byte[] buffer2 = new SHA1CryptoServiceProvider().ComputeHash(bytes);

Java

MessageDigest sha1 = MessageDigest.getInstance("SHA1");
        byte[] buffer2 = sha1.digest(bytes);

Any help would be greatly appreciated.

Maybe the problem is in endianness?

Vlad
– Vlad

2012-12-06 10:36:57 +00:00
Commented Dec 6, 2012 at 10:36 — Vlad
– Vlad, Commented Dec 6, 2012 at 10:36
Did you see this? stackoverflow.com/questions/6843698/…

Itay Karo
– Itay Karo

2012-12-06 10:37:03 +00:00
Commented Dec 6, 2012 at 10:37 — Itay Karo
– Itay Karo, Commented Dec 6, 2012 at 10:37
what is the value of bytes in both cases?

Nikolay Kuznetsov
– Nikolay Kuznetsov

2012-12-06 10:38:48 +00:00
Commented Dec 6, 2012 at 10:38 — Nikolay Kuznetsov
– Nikolay Kuznetsov, Commented Dec 6, 2012 at 10:38
No i didn't find that .. let me check

Freak
– Freak

2012-12-06 10:42:41 +00:00
Commented Dec 6, 2012 at 10:42 — Freak
– Freak, Commented Dec 6, 2012 at 10:42
If they have the same values... how are they different?

AHungerArtist
– AHungerArtist

2012-12-06 10:47:28 +00:00
Commented Dec 6, 2012 at 10:47 — AHungerArtist
– AHungerArtist, Commented Dec 6, 2012 at 10:47

Asuka · Accepted Answer · 2012-12-06 10:51:43Z

3

I think problem is that in C# byte is unsigned type, and in java it not.

This 2 codes works equally:

    public static void main(String[] args) throws NoSuchAlgorithmException {
        MessageDigest sha1 = MessageDigest.getInstance("SHA1");
        byte[] bytes = new byte[] { 1, 2, 10 };
        byte[] buffer2 = sha1.digest(bytes);
        for(byte b : buffer2){
            System.out.println(b);
        }
    }

    static void Main(string[] args)
    {
        var bytes = new byte[] { 1, 2, 10 };
        var buffer = new SHA1CryptoServiceProvider().ComputeHash(bytes);
        foreach (var b in buffer)
        {
            Console.WriteLine((sbyte)b); //attention to cast           
        }
        Console.Read();
    }

answered Dec 6, 2012 at 10:51

Asuka

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Comments

Community · Accepted Answer · 2017-05-23 12:26:29Z

2

So just to recap my comment as an answer. See this: Calculating SHA-1 hashes in Java and C#
Basically - Java bytes are signed while C# bytes are not. The internal representation of both results will be the same but printing them will yield different results unless you do proper conversions.

edited May 23, 2017 at 12:26

CommunityBot

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answered Dec 6, 2012 at 10:52

Itay Karo

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