Check sum logic compatible for C# and java.

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I am using c# code to compute the checksum.

I am using crc32 dll.

i need to send the checksum value to another application, they are using JAVA.

they are also using the same crc32 algorithem.

My c# code below.

<pre>  Crc32 achk = new Crc32();

byte[] bytes = System.Text.Encoding.UTF8.GetBytes("6210|25042017164248|Srikanth|123456|R|123456789|123456789|100|test|10|srikanth|8019412555|||Srikanth");
achk.Update(bytes);

My value is: 4140400987

from their end, the value is:355590133

please suggest the code which is both compatible for c# and java.

What I have tried:

check sum logic compatible for c# and java.

Posted 25-Apr-17 1:19am

Member 13150761

Updated 25-Apr-17 2:05am

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Comments

Tomas Takac 25-Apr-17 7:46am

Perhaps they are using different seed.

Member 13150761 25-Apr-17 8:39am

They are using the same seed.

Richard Deeming 25-Apr-17 15:38pm

Perhaps they're using a different encoding?

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Jochen Arndt · Answer 1 · 2017-04-25T02:05:00

CRC's are based on polynomial values which may be different (see also Cyclic redundancy check - Wikipedia[^]).

So you have to use the same polynomial values with the same bit order for your C# and Java calculations.

The Java sources can be found here: Source for java.util.zip.CRC32 (GNU Classpath 0.95 Documentation)[^]. It is based on RFC 1952[^]. According to those the polynoimal 0xedb88320 is used.

So you have to ensure that the C# calculation uses the same. Check the documentation of the used DLL (or the source code if available). If the polynomial can't be specified you have to use a different DLL or write your own (e.g. by converting the Java code to C#).