AccountSas.cs

namespace AccountSAS
{
    using System;
    using System.Linq;
    using System.Collections.Generic;
    using System.Net.Http;
    using System.Security.Cryptography;
    using System.Text;
    using System.Threading.Tasks;
    using System.Web;
    using System.Globalization;

    class Program
    {
        const string accountkey = "UqhiqGVBWNHWtCIrGwTudidp9oxvu...........................................==";

        public static void Main(string[] args) => MainAsync(args).GetAwaiter().GetResult();
        public static async Task MainAsync(string[] args)
        {
            // https://docs.microsoft.com/en-us/rest/api/storageservices/authentication-for-the-azure-storage-services

            var accountname = "erlang";
            var cloudEnvironmentSuffix = "core.windows.net";

            var host = $"{accountname}.blob.{cloudEnvironmentSuffix}";
            var resourcePath = "/";
            var query = "comp=list";

            var url = $"https://{host}{resourcePath}?{query}";

            Func<DateTime, string> dateToString = _ => $"{_.ToUniversalTime().ToString("ddd, dd MMM yyyy HH:mm:ss", new CultureInfo("en-US"))} GMT";
            var xMsDate = dateToString(DateTime.Now);// Mon, 22 Jan 2018 20:55:12 GMT
            var xMsVersion = "2015-04-05";
            var verb = "GET";
            var contentEncoding = "";
            var contentLanguage = "";
            var contentLength = "";
            var contentMD5 = "";
            var contentType = "";
            var date = "";
            var ifModifiedSince = "";
            var ifMatch = "";
            var ifNoneMatch = "";
            var ifUnmodifiedSince = "";
            var range = "";
            var canonicalizedHeaders = $"x-ms-date:{xMsDate}\nx-ms-version:{xMsVersion}";

            Func<string, Uri, string> getCanonicalizedResource = (accountName, theUrl) => {
                // see https://docs.microsoft.com/en-us/rest/api/storageservices/authentication-for-the-azure-storage-services
                var result = new StringBuilder();
                // Beginning with an empty string (""), append a forward slash (/), followed by the name of the account that owns the resource being accessed
                result.Append($"/{accountName}");

                // Append the resource's encoded URI path, without any query parameters
                result.Append(HttpUtility.UrlDecode(theUrl.LocalPath));

                result.Append("\n");
                // Retrieve all query parameters on the resource URI, including the comp parameter if it exists
                var queryParams = HttpUtility.ParseQueryString(theUrl.Query);
                var q2 = new Dictionary<string, string>();
                foreach (var k in queryParams.AllKeys)
                {
                    q2.Add(HttpUtility.UrlDecode(k).ToLower(), HttpUtility.UrlDecode(queryParams[k]));
                }
                result.Append(string.Join("\n", q2.Keys.OrderBy(__ => __).Select(__ => $"{__}:{q2[__]}").ToArray()));

                return result.ToString();
            };
            var canonicalizedResource = getCanonicalizedResource(accountname, new Uri(url));

            var stringToSign = $"{verb}\n{contentEncoding}\n{contentLanguage}\n{contentLength}\n{contentMD5}\n{contentType}\n{date}\n{ifModifiedSince}\n{ifMatch}\n{ifNoneMatch}\n{ifUnmodifiedSince}\n{range}\n{canonicalizedHeaders}\n{canonicalizedResource}";

            var signature =
                Convert.ToBase64String(
                    (new HMACSHA256(Convert.FromBase64String(accountkey))).ComputeHash(
                        Encoding.UTF8.GetBytes(
                            stringToSign)));


            var request = new HttpRequestMessage(HttpMethod.Get, requestUri: url);
            request.Headers.Add("x-ms-date", xMsDate);
            request.Headers.Add("x-ms-version", xMsVersion);
            request.Headers.Add("Authorization", $"SharedKey {accountname}:{signature}");

            var response = await new HttpClient().SendAsync(request);
            var body = await response.Content.ReadAsStringAsync();
            await Console.Out.WriteAsync(body);
        }
    }
}

trace.http.txt

GET https://erlang.blob.core.windows.net/?comp=list HTTP/1.1
Authorization: SharedKey erlang:1mBiYrJLA7deadbeefksecretsupervaluedjdjdjdH=
x-ms-date: Thu, 01 Feb 2018 12:58:39 GMT
x-ms-version: 2015-04-05

HTTP/1.1 200 OK
Content-Type: application/xml
Server: Windows-Azure-Blob/1.0 Microsoft-HTTPAPI/2.0
x-ms-request-id: fe740fd5-001e-0046-6e5c-9bf0ca000000
x-ms-version: 2015-04-05
Date: Thu, 01 Feb 2018 12:58:39 GMT
Content-Length: 1319

<?xml version="1.0" encoding="utf-8"?><EnumerationResults ServiceEndpoint="https://erlang.blob.core.windows.net/"><Containers><Container><Name>datacamp</Name><Properties><Last-Modified>Mon, 07 Nov 2016 14:24:52 GMT</Last-Modified><Etag>"0x8D40719D6AD1DA2"</Etag><LeaseStatus>unlocked</LeaseStatus><LeaseState>available</LeaseState></Properties></Container><Container><Name>otp</Name><Properties><Last-Modified>Thu, 27 Oct 2016 05:46:07 GMT</Last-Modified><Etag>"0x8D3FE2C8C8C182F"</Etag><LeaseStatus>unlocked</LeaseStatus><LeaseState>available</LeaseState></Properties></Container><Container><Name>philipp</Name><Properties><Last-Modified>Tue, 21 Feb 2017 20:39:13 GMT</Last-Modified><Etag>"0x8D45A99B2695859"</Etag><LeaseStatus>unlocked</LeaseStatus><LeaseState>available</LeaseState></Properties></Container><Container><Name>private</Name><Properties><Last-Modified>Wed, 31 Jan 2018 18:39:09 GMT</Last-Modified><Etag>"0x8D568D9EAB0C569"</Etag><LeaseStatus>unlocked</LeaseStatus><LeaseState>available</LeaseState></Properties></Container><Container><Name>weblogs</Name><Properties><Last-Modified>Sat, 19 Nov 2016 19:37:39 GMT</Last-Modified><Etag>"0x8D410B385D5EFA8"</Etag><LeaseStatus>unlocked</LeaseStatus><LeaseState>available</LeaseState></Properties></Container></Containers><NextMarker /></EnumerationResults>