HashAlgorithmNames.cs

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using System;
using System.Collections.Generic;
using System.Security.Cryptography;
 
namespace Internal.Cryptography;
 
internal static class HashAlgorithmNames
{
    private static readonly HashSet<string> s_allNames = CreateAllNames();
 
    public static string ToAlgorithmName(this HashAlgorithm hashAlgorithm)
    {
        if (hashAlgorithm is SHA1)
        {
            return "SHA1";
        }
        if (hashAlgorithm is SHA256)
        {
            return "SHA256";
        }
        if (hashAlgorithm is SHA384)
        {
            return "SHA384";
        }
        if (hashAlgorithm is SHA512)
        {
            return "SHA512";
        }
        if (hashAlgorithm is MD5)
        {
            return "MD5";
        }
        return hashAlgorithm.ToString();
    }
 
    public static string ToUpper(string hashAlgorithName)
    {
        if (s_allNames.Contains(hashAlgorithName))
        {
            return hashAlgorithName.ToUpperInvariant();
        }
        return hashAlgorithName;
    }
 
    private static HashSet<string> CreateAllNames()
    {
        HashSet<string> hashSet = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
        hashSet.Add("SHA1");
        hashSet.Add("SHA256");
        hashSet.Add("SHA384");
        hashSet.Add("SHA512");
        hashSet.Add("MD5");
        return hashSet;
    }
}