Generate SHA1 Hash in Portable Class Library

Question

I\'m trying to build a portable class library that generates OAuth urls for other classes/applications to use. This class library using OAuth has to be a portable class libr

Answer 1

You might want to check out the new .NET Standard library:

https://docs.microsoft.com/en-us/dotnet/articles/standard/library

It is portable, and System.Security.Cryptography is included.

    /// 

    /// Compute hash for string encoded as UTF8
    /// 
    /// String to be hashed.
    /// 40-character hex string.
    public static string GetSha1(string input)
    {
        using (var sha1 = System.Security.Cryptography.SHA1.Create())
        {
            byte[] inputBytes = Encoding.UTF8.GetBytes(input);
            byte[] hash = sha1.ComputeHash(inputBytes);

            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < hash.Length; i++)
            {
                sb.Append(hash[i].ToString("X2"));
            }
            return sb.ToString();
        }
    }

You might also get some help (for creating a PCL project with .NET Standard Library) here:

https://xamarinhelp.com/dot-net-standard-pcl-xamarin-forms/