Hashing

    public static string Hash(string username, string value)
    {
        var passwordHasher = new PasswordHasher<string>();
        string hashedText = passwordHasher.HashPassword(username, value);
        return hashedText;
    }

    public static bool VerifyHashedValue(string username, string hashedValue, string providedValue)
    {
        var passwordHasher = new PasswordHasher<string>();
        var verificationResult = passwordHasher.VerifyHashedPassword(username, hashedValue, providedValue);
        return verificationResult == PasswordVerificationResult.Success;
    }

Note: in the references, here is the official documentation about hashing passwords in .NET Core. But Microsoft recommends using PasswordHasher in new apps.

References

• Hash password in ASP.NET Core