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determining the initialization vector in CBC mode
In phase 1, material for the initialization vector (IV material)
CBC mode encryption algorithms is derived from a hash of a
concatenation of the initiator's public Diffie-Hellman value and
responder's public Diffie-Hellman value using the negotiated hash
algorithm. This is used for the first message only.
Do I assume SKEYID_e is the key for the hash alforithmi.e.
IV = prf(SKEYID_e, g^xi | g^xr)
Any input would be appreciated.