How to use sha-256 hash function for DTLS-SRTP in iOS

[toney t]

Hello,

I'm working on an telephony App for iOS that uses WebRTC and noticed that for some reason sha-1 is used as the default hash function to compute the fingerprint for DTLS-SRTP. How can I change that to sha-256 given that it is more secure? Is there some key/value pair on RTCMediaConstraints that I don't know about?

Best regards

[Justin Uberti]

See https://code.google.com/p/webrtc/issues/detail?id=1928. 

But you probably don't need sha-256. The MAC is already being chopped to 80 bits for the SRTP crypto suite, so it's unlikely moving to sha-256 will buy you anything.

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