[h323plus] H.235 Media Encryption Help

Jad el-Hage jadh12 at gmail.com
Thu Apr 22 13:41:45 EDT 2010

I am trying to setup secure calls with H.323 endpoints. I am currently
testing with polcom PVX.

I can negotiate a shared secret using diffie-hellman and the first 8 bytes
of the shared secret match the PVX's check code.

But how to derive the media encryption keys from the shared secret ?

>From H.235.6 I understand that the shared secret must be used to decrypt
encryptedSessionKey, but the decryption is failing?

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