GetHashCode method Returns different values for same string in asp.net core

Question

I have following code written in application.

  var salt = "0115ee62e6e5e8ea68db9e2d7e72cec85e810ad9566212ffc2c4b76a17ca0b00";
  var hashCode = StringComparer.OrdinalIgnoreCase.GetHashCode(salt ?? string.Empty);

It has different behaviour in 'asp.net core' and 'standard' framework.

Framework 4.7: If I will use this code in website/console application created in standard framework of .net, it alwasy give me same result. The value of hashcode variable is always "1066337973".

Asp.net Core: If I will use this code in asp.net core website, then every time I stop the application and start again, the hashcode variable have differnt value.

Becasue of this problem, my logic is getting failed in asp.net core application.
How this problem can be solved?

Salting Your Password: Best Practices? stackoverflow.com/questions/674904/… — Roman Ryzhiy
– Roman Ryzhiy, Commented Sep 21, 2020 at 12:24
@RomanRyzhiy, I have a big logic written for encryption and decryption and that is working fine in other .net frameworks. when I tried to use the same logic for .net core application then it is not working for me. — Gurpreet Kailey
– Gurpreet Kailey, Commented Sep 21, 2020 at 12:29
GetHashCode implementation was changed in .NET Core, it's an expected behavior, have a look at this article Why is string.GetHashCode() different each time I run my program in .NET Core? — Pavel Anikhouski
– Pavel Anikhouski, Commented Sep 21, 2020 at 12:33
Remarks section of GetHashCode tells you do not persist hash value and do not use the hash code instead of a value returned by a cryptographic hashing function — Pavel Anikhouski
– Pavel Anikhouski, Commented Sep 21, 2020 at 12:37
Also, from String.GetHashCode Hash codes for identical strings can differ across .NET implementations, across .NET versions, and across .NET platforms (such as 32-bit and 64-bit) for a single version of .NET. In some cases, they can even differ by application domain. This implies that two subsequent runs of the same program may return different hash codes. — Pavel Anikhouski
– Pavel Anikhouski, Commented Sep 21, 2020 at 12:40

Gurpreet Kailey · Accepted Answer · 2021-05-19 12:56:45Z

6

As per @Pavel Anikhouski

GetHashCode implementation was changed in .NET Core, it's expected behavior, have a look at this article Why is string.GetHashCode() different each time I run my program in .NET Core?

String.GetHashCode Hash codes for identical strings can differ across .NET implementations, across .NET versions, and across .NET platforms (such as 32-bit and 64-bit) for a single version of .NET. In some cases, they can even differ by application domain. This implies that two subsequent runs of the same program may return different hash codes.

answered May 19, 2021 at 12:56

Gurpreet Kailey

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