Generating Hashes using .NET Core
.net-core, hash, random, security
Solution
`RNGCryptoServiceProvider` is not in .NET Core. Use `RandomNumberGenerator.Create()` to get an instance of a CSPRNG that will work on the correct platform. Its API is the same as `RNGCryptoServiceProvider`, except that `GetNonZeroBytes` is missing (which I'd argue shouldn't have even been there).
On Windows, this will boil down to `BCryptGenRandom` in CNG, and on Linux it will use OpenSSL.
Problem
I need to Generate Random Unique hashes to be used in password reset links in .Net Core. In ASP.NET Identity, I found this to be helpful, I am wondering if RNGCryptoServiceProvider still assures the randomness of the hashes generated. ``` using (RNGCryptoServiceProvider rngCsp = new RNGCryptoServiceProvider()) { var data = new byte[4]; for (int i = 0; i < 10; i++) { //filled with an array of random numbers rngCsp.GetBytes(data); //this is converted into a character from A to Z var randomchar = Convert.ToChar( //produce a random number //between 0 and 25 BitConverter.ToUInt32(data, 0) % 26 //Convert.ToInt32('A')==65 + 65 ); token.Append(randomchar); } } ``` What is the best way to achieve that using .net core and using which classes?