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Thread: Hash generation using SecureToken version 2

  1. #1
    Join Date
    Sep 2014
    Posts
    1

    Smile Hash generation using SecureToken version 2

    Hi to all,

    I just want to ask how to generate the securetoken hash on the http://www.wowza.com/forums/content.php?620 documentation (How to protect streaming using SecureToken in Wowza Streaming Engine) specifically the following:

    "Important: The client web server should generate the hash when it generates the client webpage. You shouldn't use JavaScript code in the client webpage to generate the hash as the code is visible in the webpage source and would pose a potential security risk."

    Can anyone provide a sample code on how to do this?


    I would like also ask how did you arrive on the wowzatokenhash=m20I4XSU1Emt zHmz8PbbRsX5OcVi7Km-qI1J3acEV-c= on the RTSP example below?

    From the string "vod/_myInstance_/sample.mp4?wowzatokenCustomParameter=abcdef&wowzatokenendtime=1500000000&xyzSharedSecret" , what operations are done to arrive at the wowzatokenhash=m20I4XSU1Emt zHmz8PbbRsX5OcVi7Km-qI1J3acEV-c= ?


    RTSP example
    This example is based on an RTSP VOD request where the application instance is specified in the URL. The default query parameter prefix (wowzatoken) is used, a custom public query parameter is included in the hash generation, and the SecureToken end time is specified. The client IP address isn't included in the hash generation and the the SecureToken start time isn't specified (SecureToken playback security is enabled immediately).

    Content URL: rtsp://192.168.1.1:1935/vod/sample.mp4
    Content path: vod/_myInstance_/sample.mp4
    Custom SecureToken public query parameter: wowzatokenCustomParameter=myValue
    Token end time: wowzatokenendtime=1500000000

    The parameters used to create the string used for hashing (not in alphabetical order):

    wowzatokenendtime=1500000000
    wowzatokenCustomParameter=abcdef
    xyzSharedSecret


    String used for hashing (in required alphabetical order):

    vod/_myInstance_/sample.mp4?wowzatokenCustomParameter=abcdef&wowzatokenendtime=1500000000&xyzSharedSecret

    RTSP URL sent to server:

    rtsp://10.0.2.31:1935/vod/_myInstance_/sample.mp4?wowzatokenendtime=1500000000&wowzatokenCustomParameter=abcdef&wowzatokenhash=m20I4XSU1Emt zHmz8PbbRsX5OcVi7Km-qI1J3acEV-c=


    Thanks a lot for the help.

    Regulus

  2. #2
    Join Date
    Jun 2012
    Posts
    723

    Default

    Hi,

    You will also need to use the wowzatokenstarttime parameter when generating the hash string. This parameter is mandatory.
    In your particular case, you should use the following string for generating the hash key:
    vod/_myInstance_/sample.mp4?wowzatokenCustomParameter=abcdef&wowzatokenendtime=1500000000&wowzatokenstarttime=1412108 004&xyzSharedSecret

    Regards,
    Zoran

  3. #3
    Join Date
    Oct 2014
    Posts
    3

    Default

    Regulus,

    In php, you should be able to create the hash using:

    $hashstr = hash('sha256','vod/_myInstance_/sample.mp4?wowzatokenCustomParameter=abcdef&wowzatokenendtime=1500000000&xyzSharedSecret');
    Zoran,

    Quote Originally Posted by zoran_u View Post
    You will also need to use the wowzatokenstarttime parameter when generating the hash string. This parameter is mandatory.
    This is contradictory to the information on http://www.wowza.com/forums/content.php?620#parameters where it says that the starttime is optional.

    Also, do the shown examples use real hash values? I suspect not as the calculated Hash vaules are the same for both RTSP and Smooth examples, even though the input hash parameters are different.

  4. #4
    Join Date
    Jun 2012
    Posts
    723

    Default

    Dave,

    You are correct. I take that back
    The starttime and endtime parameters are optional.

    The input parameters for the hash calculation are not dependant on the type of streaming protocol you are using. Whether the protocol is RTMP, RTSP or HTTP based, the stream name, secret key and/or endtime, starttime are not changed.

    Also, to generate the correct hash key to be used in the playback URL, don't forget to Base64 encode the hash key resulted form the PHP code Dave mentioned:
    $hashstr = hash('sha256', 'vod/_myInstance_/sample.mp4?wowzatokenCustomParameter=abcdef&wowzatokenendtime=1500000000&xyzSharedSecret', true);
    $usableHash= strtr(base64_encode($hashstr), '+/', '-_');
    Zoran
    Last edited by zoran_u; 10-08-2014 at 02:07 PM.

  5. #5
    Join Date
    Oct 2014
    Posts
    3

    Default

    Zoran, yes, the [+/] to [-_] swap is important!! I had missed that bit.

    Just for the next person looking for this, in actionScript (AS3)
    import com.adobe.crypto.SHA256;
    
    var hash:String = SHA256.hashToBase64(hashstring);
    var regExp1:RegExp = /\+/g;
    var regExp2:RegExp = /\//g;
    				
    hash=hash.replace(regExp1,'-');
    usablehash=hash.replace(regExp2,'_');

  6. #6
    Join Date
    Nov 2014
    Posts
    13

    Default

    Is there a code for c#?

  7. #7
    Join Date
    Dec 2014
    Posts
    1

    Default

    Hey!
    We got success HASH

    Do not belive support. :'-((((((((
    All parameters are mandatory

    So we have Shared Secret:c7800e7e5afc8c0b
    I take Zoran code and put there my string like this
    {code}
    $hashstr = hash('sha256', 'live/_definst_/test.stream?c7800e7e5afc8c0b&wowzatokenendtime=0&wowzatokenstarttime=0', true); # IMPORTANT to set third parameter equals to TRUE
    $usableHash= strtr(base64_encode($hashstr), '+/', '-_');
    echo $usableHash;
    {code}
    result was: cfGUWrQ-PONy6fhWSR9cyEtnXYpAQeJqrBsES_jzqJw=

    You have to get result and put it to rtmp URL like this one:
    rtmp://{skipped_IP}:1935/live/_definst_/test.stream?wowzatokenendtime=0&wowzatokenstarttime=0&wowzatokenhash=cfGUWrQ-PONy6fhWSR9cyEtnXYpAQeJqrBsES_jzqJw=

    ATTENTION!!!!!!
    wowzatokenendtime=0&wowzatokenstarttime=0 They are not OPTIONAL

  8. #8
    Join Date
    Feb 2012
    Posts
    1

    Thumbs up Akavjik, thanks for your advices.

    Quote Originally Posted by akavjik View Post
    Hey!
    We got success HASH

    Do not belive support. :'-((((((((
    All parameters are mandatory

    So we have Shared Secret:c7800e7e5afc8c0b
    I take Zoran code and put there my string like this
    {code}
    $hashstr = hash('sha256', 'live/_definst_/test.stream?c7800e7e5afc8c0b&wowzatokenendtime=0&wowzatokenstarttime=0', true); # IMPORTANT to set third parameter equals to TRUE
    $usableHash= strtr(base64_encode($hashstr), '+/', '-_');
    echo $usableHash;
    {code}
    result was: cfGUWrQ-PONy6fhWSR9cyEtnXYpAQeJqrBsES_jzqJw=

    You have to get result and put it to rtmp URL like this one:
    rtmp://{skipped_IP}:1935/live/_definst_/test.stream?wowzatokenendtime=0&wowzatokenstarttime=0&wowzatokenhash=cfGUWrQ-PONy6fhWSR9cyEtnXYpAQeJqrBsES_jzqJw=

    ATTENTION!!!!!!
    wowzatokenendtime=0&wowzatokenstarttime=0 They are not OPTIONAL
    Since yesterday I was sticking to the support note instructions and couldn't figure why the SecureToken wasn't working properly.
    I followed your instructions and managed to hash !

    The support note How to protect streaming using SecureToken in Wowza Streaming Engine should be updated by the Wowza team...

    Akavjik, thanks for your advices.

  9. #9
    Join Date
    May 2011
    Posts
    456

    Default

    The starttime and endtime parameters are optional.

    Note that if no starttime is specified, the Streaming Engine will start as soon as the request is received. If no endtime is specified, then the token does not expire. For the majority of workflows, you will want to specify an endtime, otherwise your content is not protected by the SecureToken as you'd expect. However, there are customers who have a use case where they want a non-expiring endtime and so it is not a required field.

    I will request an update to the Support article How to protect streaming using SecureToken in Wowza Streaming Engine. Thank you for the feedback.

    -Lisa

  10. Default

    Quote Originally Posted by lisa_w View Post
    I will request an update to the Support article How to protect streaming using SecureToken in Wowza Streaming Engine. Thank you for the feedback.
    -Lisa
    If I could add its generally very handy to have code examples along with thease types of guides.

    e.g

    php
    asp (classic)
    asp.net

    that way you will get a lot less support/tutorial requests about how to do this.

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