The appropriate client certificate was not used when using HLS with AVPlayer

Originator:k-hayashida
Number:rdar://26239710 Date Originated:12-May-2016 03:39 PM
Status:Open Resolved:
Product:iOS SDK Product Version:iOS 9.3.1
Classification:Security Reproducible:Allways
 
Summary:
An error has occurred (described in the Actual Results section) when trying connect to a server that requires client certificate authentication using NSURLCredential with AVPlayer even after setting a client certificate in the NSURLCredential.

Steps to Reproduce:
1. Use NSURLCredential (loaded with the client certificate) with iOS application
2. Connect to a server that supports playback via HLS with AVPlayer
3. Server requests for client certificate

Expected Results:
1. iOS device sends (client certificate) to server, and passes the authentication
2. Server responds with related video data and starts playback.

Actual Results:
The following is the client certificate sent for authentication to which it failed:

```
/C=US/O=Apple Inc./OU=Apple Certification Authority/CN=Apple Root CA, issuer: /C=US/O=Apple Inc./OU=Apple Certification Authority/CN=Apple Root CA
```

Why is it that AVPlayer uses this client certificate instead of the specified one?


Version:
Xcode Version 7.3 (7D175)

Notes:
The issue reproduction from devices were 100% however,
when we tried it with simulator (using another client certificate), it works fine

Configuration:
Test Devices、with iOS9.3: iPhone 5s (Model A1453, A1533) iPod touch (5th generation) iPad Air 2 (Model A1566)

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