Issue with error CS0246: The type or namespace name 'HMACSHA1' could not be found

Target Platforms XR
1

Hello, I have a similar problem. I’m using TwitterAPI.cs I found online:

using UnityEngine;

using System;
using System.Security.Cryptography;
using System.Collections.Generic;
using System.Text;
using System.Globalization;
using System.Collections;


using MiniJSON;

public class TwitterAPI : MonoBehaviour { 
    public string oauthConsumerKey = "";
    public string oauthConsumerSecret = "";
    public string oauthToken = "";
    public string oauthTokenSecret = "";

    private string oauthNonce = "";
    private string oauthTimeStamp = "";

    public static TwitterAPI instance = null;

    // Use this for initialization
    void Awake () {
        if (instance == null) {
            instance = this;
        }
        else {
            Debug.LogError("More then one instance of TwitterAPI: " + this.transform.name);
        }
    }

    public void SearchTwitter(string keywords, Action<List<TweetSearchTwitterData> > callback)
    { 
        PrepareOAuthData();
        StartCoroutine(SearchTwitter_Coroutine(keywords, callback));
    }

    public void FindTrendsByLocationTwitter(string location, Action<List<TrendByLocationTwitterData> > callback)
    {    
        PrepareOAuthData();
        StartCoroutine(FindTrendsByLocation_Coroutine(location, callback));
    }

    private IEnumerator SearchTwitter_Coroutine(string keywords, Action<List<TweetSearchTwitterData> > callback)
    {
        // Fix up hashes to be webfriendly
        keywords = Uri.EscapeDataString(keywords);

        string twitterUrl = "https://api.twitter.com/1.1/search/tweets.json";
     
        SortedDictionary<string, string> twitterParamsDictionary = new SortedDictionary<string, string>
        {
            {"q", keywords},
            {"count", "100"},
            {"result_type", "recent"},
        };

        WWW query = CreateTwitterAPIQuery(twitterUrl, twitterParamsDictionary);
        yield return query;

        callback(ParseResultsFromSearchTwitter(query.text));
    }

    // Use of MINI JSON http://forum.unity3d.com/threads/35484-MiniJSON-script-for-parsing-JSON-data
    private List<TweetSearchTwitterData> ParseResultsFromSearchTwitter(string jsonResults) {
        Debug.Log(jsonResults);
     
        List<TweetSearchTwitterData> twitterDataList = new List<TweetSearchTwitterData>();
        object jsonObject = Json.Deserialize(jsonResults);
        IDictionary search = (IDictionary) jsonObject;
        IList tweets = (IList) search["statuses"];
        foreach (IDictionary tweet in tweets) {
            IDictionary userInfo = tweet["user"] as IDictionary;        
         
            TweetSearchTwitterData twitterData = new TweetSearchTwitterData();        
            twitterData.tweetText = tweet["text"] as string;
            twitterData.screenName = userInfo["screen_name"] as string;
            twitterData.retweetCount = (Int64)tweet["retweet_count"];
            twitterData.profileImageUrl = userInfo["profile_image_url"] as string;
         
            twitterDataList.Add(twitterData);
        }
     
        return twitterDataList;
    }

    private IEnumerator FindTrendsByLocation_Coroutine(string location, Action<List<TrendByLocationTwitterData> > callback)
    {
        location = Uri.EscapeDataString(location);
        string twitterUrl = "https://api.twitter.com/1.1/trends/place.json";
        SortedDictionary<string, string> twitterParamsDictionary = new SortedDictionary<string, string>
        {
            {"id", location}
        };

        WWW query = CreateTwitterAPIQuery(twitterUrl, twitterParamsDictionary);
        yield return query;
     
        callback(ParseResultsFromFindTrendsByLocationTwitter(query.text));
    }

    private List<TrendByLocationTwitterData> ParseResultsFromFindTrendsByLocationTwitter(string jsonResults) {
        Debug.Log(jsonResults);
     
        List<TrendByLocationTwitterData> twitterDataList = new List<TrendByLocationTwitterData>();
        object jsonObject = Json.Deserialize(jsonResults);
        IList jsonList = jsonObject as IList;
        IDictionary search = jsonList[0] as IDictionary;
        IList trends = (IList) search["trends"];
        foreach (IDictionary trend in trends) {
            TrendByLocationTwitterData twitterData = new TrendByLocationTwitterData();        
            twitterData.name = trend["name"] as string;
            twitterData.query = trend["query"] as string;
            twitterData.url = trend["url"] as string;
         
            twitterDataList.Add(twitterData);
        }
     
        return twitterDataList;
    }

    private WWW CreateTwitterAPIQuery(string twitterUrl, SortedDictionary<string, string> twitterParamsDictionary)
    {
        string signature = CreateSignature(twitterUrl, twitterParamsDictionary);
        Debug.Log("OAuth Signature: " + signature);
     
        string authHeaderParam = CreateAuthorizationHeaderParameter(signature, this.oauthTimeStamp);
        Debug.Log("Auth Header: " + authHeaderParam);
     
        Dictionary<string, string> headers = new Dictionary<string, string>();
        headers["Authorization"] = authHeaderParam;
     
        string twitterParams = ParamDictionaryToString(twitterParamsDictionary);
     
        WWW query = new WWW(twitterUrl + "?" + twitterParams, null, headers);    
        return query;
    }


    private void PrepareOAuthData() {
        oauthNonce = Convert.ToBase64String(new ASCIIEncoding().GetBytes(DateTime.Now.Ticks.ToString(CultureInfo.InvariantCulture)));
        TimeSpan _timeSpan = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0);    
        oauthTimeStamp = Convert.ToInt64(_timeSpan.TotalSeconds).ToString(CultureInfo.InvariantCulture);

        // Override the nounce and timestamp here if troubleshooting with Twitter's OAuth Tool
        //oauthNonce = "69db07d069ac50cd673f52ee08678596";
        //oauthTimeStamp = "1442419142";
    }
     
    // Taken from http://www.i-avington.com/Posts/Post/making-a-twitter-oauth-api-call-using-c
    private string CreateSignature(string url, SortedDictionary<string, string> searchParamsDictionary)
    {
        //string builder will be used to append all the key value pairs
        StringBuilder signatureBaseStringBuilder = new StringBuilder();
        signatureBaseStringBuilder.Append("GET&");
        signatureBaseStringBuilder.Append(Uri.EscapeDataString(url));
        signatureBaseStringBuilder.Append("&");

        //the key value pairs have to be sorted by encoded key
        SortedDictionary<string, string> urlParamsDictionary = new SortedDictionary<string, string>
                             {
                                 {"oauth_version", "1.0"},
                                 {"oauth_consumer_key", this.oauthConsumerKey},
                                 {"oauth_nonce", this.oauthNonce},
                                 {"oauth_signature_method", "HMAC-SHA1"},
                                 {"oauth_timestamp", this.oauthTimeStamp},
                                 {"oauth_token", this.oauthToken}
                             };
     
        foreach (KeyValuePair<string, string> keyValuePair in searchParamsDictionary)
        {
            urlParamsDictionary.Add(keyValuePair.Key, keyValuePair.Value);
        } 
     
        signatureBaseStringBuilder.Append(Uri.EscapeDataString(ParamDictionaryToString(urlParamsDictionary)));
           string signatureBaseString = signatureBaseStringBuilder.ToString();

        Debug.Log("Signature Base String: " + signatureBaseString);
     
        //generation the signature key the hash will use
        string signatureKey =
            Uri.EscapeDataString(this.oauthConsumerSecret) + "&" +
            Uri.EscapeDataString(this.oauthTokenSecret);

        HMACSHA1 hmacsha1 = new HMACSHA1(
            new ASCIIEncoding().GetBytes(signatureKey));

        //hash the values
        string signatureString = Convert.ToBase64String(
            hmacsha1.ComputeHash(
                new ASCIIEncoding().GetBytes(signatureBaseString)));
     
        return signatureString;
    }

    private string CreateAuthorizationHeaderParameter(string signature, string timeStamp)
    {
        string authorizationHeaderParams = String.Empty;
        authorizationHeaderParams += "OAuth ";
   
        authorizationHeaderParams += "oauth_consumer_key="
                                     + "\"" + Uri.EscapeDataString(this.oauthConsumerKey) + "\", ";
     
        authorizationHeaderParams += "oauth_nonce=" + "\"" +
                                     Uri.EscapeDataString(this.oauthNonce) + "\", ";
     
        authorizationHeaderParams += "oauth_signature=" + "\""
                                     + Uri.EscapeDataString(signature) + "\", ";
   
        authorizationHeaderParams += "oauth_signature_method=" + "\"" +
            Uri.EscapeDataString("HMAC-SHA1") +
            "\", ";

        authorizationHeaderParams += "oauth_timestamp=" + "\"" +
                                     Uri.EscapeDataString(timeStamp) + "\", ";    

        authorizationHeaderParams += "oauth_token=" + "\"" +
                                     Uri.EscapeDataString(this.oauthToken) + "\", ";

        authorizationHeaderParams += "oauth_version=" + "\"" +
                                     Uri.EscapeDataString("1.0") + "\"";
        return authorizationHeaderParams;
    }

    private string ParamDictionaryToString(IDictionary<string, string> paramsDictionary) {
        StringBuilder dictionaryStringBuilder = new StringBuilder();    
        foreach (KeyValuePair<string, string> keyValuePair in paramsDictionary)
        {
            //append a = between the key and the value and a & after the value
            dictionaryStringBuilder.Append(string.Format("{0}={1}&", keyValuePair.Key, keyValuePair.Value));
        }

        // Get rid of the extra & at the end of the string
        string paramString = dictionaryStringBuilder.ToString().Substring(0, dictionaryStringBuilder.Length - 1);
        return paramString;
    }
}

but when I am trying to compile it for Hololens I get:

Could anyone advise on changes that need to be made to make it work?

Thanks!

2

Ok, so I was able to make it work by adopting Reference Rewriter: Error: type `System.Security.Cryptography.HMACSHA1` doesn't exist in target fram - Unity Engine - Unity Discussions

However, instead of MacAlgorithmNames.HmacSha256, I used MacAlgorithmNames.HmacSha1. The resulting code is (working both in the editor and Hololens):

using UnityEngine;

using System;
using System.Security.Cryptography;
using System.Collections.Generic;
using System.Text;
using System.Globalization;
using System.Collections;


using MiniJSON;

#if NETFX_CORE
using System.Runtime.InteropServices.WindowsRuntime;
using Windows.Security.Cryptography;
using Windows.Security.Cryptography.Core;
#endif

public class TwitterAPI : MonoBehaviour {   
    public string oauthConsumerKey = "";
    public string oauthConsumerSecret = "";
    public string oauthToken = "";
    public string oauthTokenSecret = "";
   
    private string oauthNonce = "";
    private string oauthTimeStamp = "";
   
    public static TwitterAPI instance = null;
   
    // Use this for initialization
    void Awake () {
        if (instance == null) {
            instance = this;
        }
        else {
            Debug.LogError("More then one instance of TwitterAPI: " + this.transform.name);
        }
    }

    public void SearchTwitter(string keywords, Action<List<TweetSearchTwitterData> > callback)
    {   
        PrepareOAuthData();
        StartCoroutine(SearchTwitter_Coroutine(keywords, callback));
    }

    public void FindTrendsByLocationTwitter(string location, Action<List<TrendByLocationTwitterData> > callback)
    {       
        PrepareOAuthData();
        StartCoroutine(FindTrendsByLocation_Coroutine(location, callback));
    }
   
    private IEnumerator SearchTwitter_Coroutine(string keywords, Action<List<TweetSearchTwitterData> > callback)
    {
        // Fix up hashes to be webfriendly
        keywords = Uri.EscapeDataString(keywords);

        string twitterUrl = "https://api.twitter.com/1.1/search/tweets.json";
       
        SortedDictionary<string, string> twitterParamsDictionary = new SortedDictionary<string, string>
        {
            {"q", keywords},
            {"count", "100"},
            {"result_type", "recent"},
        };

        WWW query = CreateTwitterAPIQuery(twitterUrl, twitterParamsDictionary);
        yield return query;

        callback(ParseResultsFromSearchTwitter(query.text));
    }

    // Use of MINI JSON http://forum.unity3d.com/threads/35484-MiniJSON-script-for-parsing-JSON-data
    private List<TweetSearchTwitterData> ParseResultsFromSearchTwitter(string jsonResults) {
        Debug.Log(jsonResults);
       
        List<TweetSearchTwitterData> twitterDataList = new List<TweetSearchTwitterData>();
        object jsonObject = Json.Deserialize(jsonResults);
        IDictionary search = (IDictionary) jsonObject;
        IList tweets = (IList) search["statuses"];
        foreach (IDictionary tweet in tweets) {
            IDictionary userInfo = tweet["user"] as IDictionary;           
           
            TweetSearchTwitterData twitterData = new TweetSearchTwitterData();           
            twitterData.tweetText = tweet["text"] as string;
            twitterData.screenName = userInfo["screen_name"] as string;
            twitterData.retweetCount = (Int64)tweet["retweet_count"];
            twitterData.profileImageUrl = userInfo["profile_image_url"] as string;
           
            twitterDataList.Add(twitterData);
        }
       
        return twitterDataList;
    }

    private IEnumerator FindTrendsByLocation_Coroutine(string location, Action<List<TrendByLocationTwitterData> > callback)
    {
        location = Uri.EscapeDataString(location);
        string twitterUrl = "https://api.twitter.com/1.1/trends/place.json";
        SortedDictionary<string, string> twitterParamsDictionary = new SortedDictionary<string, string>
        {
            {"id", location}
        };

        WWW query = CreateTwitterAPIQuery(twitterUrl, twitterParamsDictionary);
        yield return query;
       
        callback(ParseResultsFromFindTrendsByLocationTwitter(query.text));
    }

    private List<TrendByLocationTwitterData> ParseResultsFromFindTrendsByLocationTwitter(string jsonResults) {
        Debug.Log(jsonResults);
       
        List<TrendByLocationTwitterData> twitterDataList = new List<TrendByLocationTwitterData>();
        object jsonObject = Json.Deserialize(jsonResults);
        IList jsonList = jsonObject as IList;
        IDictionary search = jsonList[0] as IDictionary;
        IList trends = (IList) search["trends"];
        foreach (IDictionary trend in trends) {
            TrendByLocationTwitterData twitterData = new TrendByLocationTwitterData();           
            twitterData.name = trend["name"] as string;
            twitterData.query = trend["query"] as string;
            twitterData.url = trend["url"] as string;
           
            twitterDataList.Add(twitterData);
        }
       
        return twitterDataList;
    }

    private WWW CreateTwitterAPIQuery(string twitterUrl, SortedDictionary<string, string> twitterParamsDictionary)
    {
        string signature = CreateSignature(twitterUrl, twitterParamsDictionary);
        Debug.Log("OAuth Signature: " + signature);
       
        string authHeaderParam = CreateAuthorizationHeaderParameter(signature, this.oauthTimeStamp);
        Debug.Log("Auth Header: " + authHeaderParam);
       
        Dictionary<string, string> headers = new Dictionary<string, string>();
        headers["Authorization"] = authHeaderParam;
       
        string twitterParams = ParamDictionaryToString(twitterParamsDictionary);
       
        WWW query = new WWW(twitterUrl + "?" + twitterParams, null, headers);       
        return query;
    }


    private void PrepareOAuthData() {
        oauthNonce = Convert.ToBase64String(new ASCIIEncoding().GetBytes(DateTime.Now.Ticks.ToString(CultureInfo.InvariantCulture)));
        TimeSpan _timeSpan = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0);       
        oauthTimeStamp = Convert.ToInt64(_timeSpan.TotalSeconds).ToString(CultureInfo.InvariantCulture);

        // Override the nounce and timestamp here if troubleshooting with Twitter's OAuth Tool
        //oauthNonce = "69db07d069ac50cd673f52ee08678596";
        //oauthTimeStamp = "1442419142";
    }
       
    // Taken from http://www.i-avington.com/Posts/Post/making-a-twitter-oauth-api-call-using-c
    private string CreateSignature(string url, SortedDictionary<string, string> searchParamsDictionary)
    {
        //string builder will be used to append all the key value pairs
        StringBuilder signatureBaseStringBuilder = new StringBuilder();
        signatureBaseStringBuilder.Append("GET&");
        signatureBaseStringBuilder.Append(Uri.EscapeDataString(url));
        signatureBaseStringBuilder.Append("&");

        //the key value pairs have to be sorted by encoded key
        SortedDictionary<string, string> urlParamsDictionary = new SortedDictionary<string, string>
                             {
                                 {"oauth_version", "1.0"},
                                 {"oauth_consumer_key", this.oauthConsumerKey},
                                 {"oauth_nonce", this.oauthNonce},
                                 {"oauth_signature_method", "HMAC-SHA1"},
                                 {"oauth_timestamp", this.oauthTimeStamp},
                                 {"oauth_token", this.oauthToken}
                             };
       
        foreach (KeyValuePair<string, string> keyValuePair in searchParamsDictionary)
        {
            urlParamsDictionary.Add(keyValuePair.Key, keyValuePair.Value);
        }   
       
        signatureBaseStringBuilder.Append(Uri.EscapeDataString(ParamDictionaryToString(urlParamsDictionary)));
           string signatureBaseString = signatureBaseStringBuilder.ToString();

        Debug.Log("Signature Base String: " + signatureBaseString);
       
        //generation the signature key the hash will use
        string signatureKey =
            Uri.EscapeDataString(this.oauthConsumerSecret) + "&" +
            Uri.EscapeDataString(this.oauthTokenSecret);

#if NETFX_CORE
        var objMacProv = MacAlgorithmProvider.OpenAlgorithm(MacAlgorithmNames.HmacSha1);
        byte[] secretKey = Encoding.UTF8.GetBytes(signatureKey);
        var hash = objMacProv.CreateHash(secretKey.AsBuffer());
        hash.Append(CryptographicBuffer.ConvertStringToBinary(signatureBaseString, BinaryStringEncoding.Utf8));
        string signatureString = CryptographicBuffer.EncodeToBase64String(hash.GetValueAndReset());
        
#else
        HMACSHA1 hmacsha1 = new HMACSHA1(
            new ASCIIEncoding().GetBytes(signatureKey));

        //hash the values
        string signatureString = Convert.ToBase64String(
            hmacsha1.ComputeHash(
                new ASCIIEncoding().GetBytes(signatureBaseString)));
#endif       
        return signatureString;
    }
   
    private string CreateAuthorizationHeaderParameter(string signature, string timeStamp)
    {
        string authorizationHeaderParams = String.Empty;
        authorizationHeaderParams += "OAuth ";
      
        authorizationHeaderParams += "oauth_consumer_key="
                                     + "\"" + Uri.EscapeDataString(this.oauthConsumerKey) + "\", ";
       
        authorizationHeaderParams += "oauth_nonce=" + "\"" +
                                     Uri.EscapeDataString(this.oauthNonce) + "\", ";
       
        authorizationHeaderParams += "oauth_signature=" + "\""
                                     + Uri.EscapeDataString(signature) + "\", ";
      
        authorizationHeaderParams += "oauth_signature_method=" + "\"" +
            Uri.EscapeDataString("HMAC-SHA1") +
            "\", ";

        authorizationHeaderParams += "oauth_timestamp=" + "\"" +
                                     Uri.EscapeDataString(timeStamp) + "\", ";       

        authorizationHeaderParams += "oauth_token=" + "\"" +
                                     Uri.EscapeDataString(this.oauthToken) + "\", ";

        authorizationHeaderParams += "oauth_version=" + "\"" +
                                     Uri.EscapeDataString("1.0") + "\"";
        return authorizationHeaderParams;
    }
   
    private string ParamDictionaryToString(IDictionary<string, string> paramsDictionary) {
        StringBuilder dictionaryStringBuilder = new StringBuilder();      
        foreach (KeyValuePair<string, string> keyValuePair in paramsDictionary)
        {
            //append a = between the key and the value and a & after the value
            dictionaryStringBuilder.Append(string.Format("{0}={1}&", keyValuePair.Key, keyValuePair.Value));
        }

        // Get rid of the extra & at the end of the string
        string paramString = dictionaryStringBuilder.ToString().Substring(0, dictionaryStringBuilder.Length - 1);
        return paramString;
    }
}