Is it possible to add support for Brightcove's implementation of Widevine?

[glennguy]

Hi,

I'm working on an addon that has some content encrypted with Widevine using Brightcove. Unfortunately the license retrieval by sending a request to their server which then is modified and sent to their actual private widevine server. The process is outlined in brief here: https://support.brightcove.com/en/video-cloud/docs/protecting-your-content-using-google-widevine

I haven't been able to see much in comparing the hex from the POST data to what Chrome sends. Here is what the android app sends to the Brightcove license server:

08 01 12 8f 0d 0a a0 0c 08 01 12 eb 09 0a ae 02 08 02 12 10 20 65 ee b5 72 be 52 f1 91 02 06 3b dc 82 cc 96 18 c6 f5 c8 bf 05 22 8e 02 30 82 01 0a 02 82 01 01 20 c3 77 8c 17 b7 86 0f 33 02 c2 c9 03 66 b6 5c ec b3 f3 03 7f 36 a8 a0 77 07 93 f7 04 74 c5 20 ef f3 af a3 21 51 2a b5 a5 73 4a d6 d0 3a 70 04 b9 13 12 8f ee 92 1a b1 92 08 81 a5 ad 34 4c d9 59 b0 0c 88 12 dd d5 16 5b 70 f3 68 e0 3c 0f a9 5b bb 2f b2 4a 34 d0 43 49 da bf da da 8a 5b 78 91 3a 9b 8e 95 2e 09 dc a5 3f 4c 6a 7c a4 ea 87 92 09 2f 4e b8 f3 22 93 7a 71 20 f4 12 6e 17 a3 2d 3f 68 44 40 79 93 96 1a e7 79 c0 03 62 fa 72 0c 57 73 38 12 ef 53 93 10 5a ee 4e 8f c4 87 6f ea 44 af ef d9 45 c5 f4 88 46 7a e4 07 b3 7f 49 fa c9 b5 64 59 3c 5d 70 d5 b8 7f 1e eb 02 2d b0 39 71 05 10 48 53 8d a7 9a a9 24 d3 07 03 83 af ed 65 a7 e9 9b f8 7d 20 a2 2a 9a 41 cc 71 5f d3 06 56 5e 5d 53 82 f0 65 2e a4 1b 99 31 ad 55 51 21 c6 09 a2 df e4 35 bd cb 45 fa 0f 97 ba e6 4a c9 02 03 01 20 01 28 dd 22 12 80 02 3b f2 23 23 de 55 5e 20 f7 aa 6e de f6 ac 07 e4 3e f9 56 e8 72 16 38 4e e5 2d e9 02 07 e5 0d a4 96 55 b1 14 aa ac 26 5e ad 8e 71 98 1b e8 be b7 0f 4e 51 9a 7b 71 e7 f0 02 dc a0 e7 23 12 82 a8 40 9d c3 ad c6 c2 63 c0 b8 ca 45 4a d8 4f 53 8a 98 1e e3 c8 39 c5 22 5f 5b dc 32 8e df f7 41 a6 12 f7 50 d4 54 17 1d 66 4b eb b1 b7 47 0f 63 7e 97 c7 e9 0a 25 4c 34 5a 65 82 c3 e9 f7 ad e0 4a f5 23 0a c8 f5 05 ba 52 37 37 cb 5c 60 3e ab b0 5c ca 1e 5e a9 af 0e 6c eb f5 39 48 f6 6b 98 69 89 dc 5b 70 15 1a b2 8a 70 83 40 d0 ee 82 62 88 cb 8a 7f 87 12 06 5e 30 13 e6 97 a1 43 a1 98 ee d2 0e 1e ad 57 fd 7c 63 5c f3 e8 06 22 b6 99 7b 23 cd 7c 9d 77 ae 3b a3 09 c1 98 f8 f6 d4 7d 03 75 d6 87 f9 14 4a e8 02 7f 08 8d d6 34 76 f6 ba 71 ea e0 bb 85 e7 16 8c b1 3a 9e d9 4f b3 07 de 1a b4 05 0a ae 02 08 01 12 10 17 dc bc 27 d1 13 41 d4 97 13 54 42 a1 88 da a6 18 8f 89 80 91 05 22 8e 02 30 82 01 0a 02 82 01 01 20 d2 1a dd 75 49 d2 74 8b 34 94 52 6a 9c 3f b8 6c 79 37 6b be 8c 88 56 f6 01 b8 d1 04 61 f7 7a cc 73 31 b1 0d eb f3 65 12 20 56 cd b5 66 2d 25 90 7b 74 f1 23 82 f0 f4 a0 ca 47 5e ea 95 62 81 5c 62 28 f6 f6 98 ad a2 78 79 d8 89 0f 2a 2d 96 a7 46 dd ef 53 16 30 1c 20 35 19 c2 a2 25 03 54 67 41 69 fd da 41 ce 14 d3 c5 2b ea 7a 38 45 15 01 2d 59 52 b3 8a a1 9e 15 e8 56 3c c7 aa a8 1c 21 22 88 0a a3 70 a6 4f ea 23 c5 3f b8 3a c3 db 57 53 21 47 30 a3 49 e0 7f 64 bf 32 be 7e ad 30 d0 26 12 af 11 0b b4 4f b0 8e 1d 30 81 73 b3 27 ef 64 d4 0c 41 63 95 42 b2 d1 a7 3c 98 a6 60 7e c6 c6 83 b5 13 a5 84 70 51 41 06 ef 87 ae 1e 7b 9c 69 5b 93 a1 04 df 74 37 bf c4 16 77 89 74 8a 43 ed 8f 2c 1f a7 10 79 3c 68 88 85 ea e7 32 a8 bf df 5b 42 3b 23 d7 5b 88 fc 0a dc 8f bd b5 02 03 01 20 01 28 dd 22 12 80 03 72 d2 fb 88 09 8b a3 b8 5b 6b 43 54 e0 37 67 db e2 d7 72 46 63 fb 0a 62 ab f7 70 4e a9 10 e0 1f 22 13 49 ee 16 d0 15 2c 76 93 84 05 0c e7 85 66 8c 06 cc fd 3d 78 9a f3 eb 69 ff 16 36 15 cd 60 91 69 fd be 2e 15 a0 29 d3 4a d2 60 56 25 bc 81 84 4c 9d 1e 2c e0 51 90 39 f3 79 9a da ef 86 64 1e 20 b0 33 dc 16 df 2e 5b 9a 1a 2a 41 7b 8b b3 b7 a4 d9 ad 1a 99 36 74 48 58 7d a1 3d de 05 a3 ed 9d 62 fa 42 07 89 73 b4 aa 40 26 3d 7b fa 23 f1 07 2e 94 cd f3 23 fa 45 f7 84 08 82 3e 55 c4 f4 c5 c7 23 81 9c f4 4c e6 d9 8e 50 c0 4e c2 4d 93 b1 aa b8 87 7b 91 08 b9 ca 39 13 08 e1 a3 64 5e bb 0e 7c ac bb 40 b5 45 15 60 ed 79 94 21 87 3b fb 5a bb 91 7f a6 0d b9 c7 7c b8 60 6a f7 e3 14 26 26 f5 ea 40 e5 cb 8a a0 89 d8 e7 d6 a9 36 19 35 c4 26 a4 45 0e a8 bc 2e 57 29 0d 3b f0 a0 96 29 91 d2 a9 1b 75 2f c8 0c 3e 7e 4e 55 03 3d 71 c9 4b 32 53 07 a6 88 15 f0 26 44 8f 56 a2 74 1c eb ef c1 8e 8c 14 2f 5f 62 bf aa 67 a2 91 51 7d de 98 2d 8c d5 a9 df 6e 3d 3a 99 b8 06 f6 d6 09 91 35 8c 5b e7 71 17 d4 f3 16 8f 33 48 e9 a0 48 53 9f 89 2f 4d 78 31 52 c7 a8 09 52 24 aa 56 b7 8c 5c f7 bd 1a b1 b1 79 c0 c0 d1 1e 3c 3b ac 84 c1 41 a0 01 91 32 1e 3a cc 17 24 2e 68 3c 1a 13 0a 0c 63 6f 6d 70 61 6e 79 5f 6e 61 6d 65 12 03 48 54 43 1a 18 0a 0a 6d 6f 64 65 6c 5f 6e 61 6d 65 12 0a 48 54 43 20 4f 6e 65 5f 4d 38 1a 0a 11 61 72 63 68 69 74 65 63 74 75 72 65 5f 6e 61 6d 65 12 0b 61 72 6d 65 61 62 69 2d 76 37 61 1a 15 0a 0b 64 65 76 69 63 65 5f 6e 61 6d 65 12 06 68 74 63 5f 6d 38 1a 19 0a 0c 70 72 6f 64 75 63 74 5f 6e 61 6d 65 12 09 6d 38 5f 67 6f 6f 67 6c 65 1a 4a 0a 0a 62 75 69 6c 64 5f 69 6e 66 6f 12 3c 68 74 63 2f 6d 38 5f 67 6f 6f 67 6c 65 2f 68 74 63 5f 6d 38 3a 36 2e 30 2f 4d 52 41 35 38 4b 2e 48 31 35 2f 36 36 36 36 37 36 3a 75 73 65 72 2f 72 65 6c 65 61 73 65 2d 6b 65 79 73 1a 2d 0a 09 64 65 76 69 63 65 5f 69 64 12 20 71 4d 4f 71 78 75 4a 55 70 7a 43 73 6a 50 6a 49 4d 59 5a 4a 49 62 6a 52 4a 6a 6c 5a 6a 48 78 20 1a 26 0a 14 77 69 64 65 76 69 6e 65 5f 63 64 6d 5f 76 65 72 73 69 6f 6e 12 0e 76 33 2e 30 2e 30 2d 61 6e 64 72 6f 69 64 32 08 10 01 20 28 0a 30 20 12 5a 0a 58 0a 32 08 01 12 10 d4 35 b3 b2 be 2e 41 e3 a1 69 99 94 ac f2 a8 ec 1a 0a 62 72 69 67 68 74 63 6f 76 65 22 10 d4 35 b3 b2 be 2e 41 e3 a1 69 99 94 ac f2 a8 ec 10 01 1a 20 38 30 44 46 35 43 46 32 46 32 30 35 37 45 35 43 42 34 30 30 30 30 30 30 30 30 30 30 30 30 30 30 18 01 20 8c be fe c1 05 30 15 38 df 88 f4 e9 02 1a 80 02 64 c5 6d cb 1f e1 c4 63 c7 46 3a 2d ca fc d1 ec 34 03 52 c0 5c 05 2f 88 0f ed 44 a1 0f b7 b6 cc b4 30 62 37 80 2c ec fe 83 83 9d 64 1b ba b1 bd 92 37 b8 02 18 42 bf 82 9b c3 49 3c 02 e9 1e 44 d8 f7 4c f2 71 28 86 ef 75 59 79 6d c3 17 a8 4c 14 46 44 8b ce 21 91 48 e6 8a 51 45 d9 fa 50 6f d9 6c ea 58 25 e5 2f 2d 01 b9 96 8c 25 b1 06 e7 bb 41 7f c1 76 13 41 62 66 18 96 98 7d 32 56 16 a9 d0 5e a3 f5 44 1c e8 5e 26 f5 a9 f6 e0 dd de c3 7b bf f1 9f e7 ab 37 ac dc 0f ef 3a ee 6a b9 03 fe 6a 5b 03 d0 4e d3 74 d8 eb 4b d0 a6 70 e3 ea 7e d7 01 13 4c d9 10 36 82 4f b3 d8 1e 14 e4 4a 9b 98 21 18 25 0f b5 fd bd 8e d4 60 6d bd 5e 8e be 08 96 55 fe f9 1d 78 af 06 88 05 72 c3 e2 47 87 58 4f fc f8 66 b4 b8 35 b0 86 38 64 41 eb 45 1c 5f 24 1e 80 13 f2 70 26 c9 9c e1 f8 8e eb  

If you have any ideas or suggestions for how I could help solve this please let me know.

Thanks

[peak3d]

Hi, you can look here for a widevine cdm implementation:
https://github.com/liberty-developer/inputstream.adaptive/tree/master/wvdecrypter

From concept its quite easy to build a BrightCoves SampleDecrypter.
You can find in the location above beside the widevine implementation as well an mediacodec implementation for android.

The hex sequence above seems to be for me a normal widevine challenge request.

[glennguy]

I already found liberty developers page, unfortunately issues aren't enabled in the fork :/ so I thought I'd try raising it here.

I have however in the last couple of days started learning c++ and managed to make a few changes to get it working how it needs to - Amazon takes a URL encoded form whereas Brightcove just wants the unmodified binary challenge request (contrary to the link in the OP where it states the request is modified). I'll see if there's some way to add auto detecting or option selecting and make a PR on the fork. Thanks for your time!

[peak3d]

I guess you have mentioned that the license string passed to the wvdecrypter already offers some possibilities. Its a kind of template where you can specify a) how data is send to the server and b) how the returned data should be interpreted. Includin if send R(aw) or B(64) encoded

Normally you don't have to modify the cpp by itself, you only have to modify the license_ky string so it fits to your needs.

Format is url|header|postdata|resonse.

[glennguy]

Awesome, thanks for the help! I'm adding |Content-Type=application%2Fx-www-form-urlencoded|A{SSM}| and it works great.

Unrelated to this particular problem, I'm getting a bunch of ERROR: AddOnLog: InputStream Adaptive: Decrypt Sample returns failure! at predictable points in playback. Audio keeps going but video freezes until you seek/skip. It always happens when the video goes black. I'm testing using an episode of The Big Bang Theory and video will stop at the start and finish of the title sequence. I can skip around it and view the whole episode with no problems, it just seems to get stuck at those points - as the widevine decrypter module isn't in the main repo, where should I raise the issue?

Thanks