On 11/01/2012 04:31 PM, Martin Storsjö wrote:
Based on my reading of RFC 5764, one doesn't set any extra context data
for the extractor, only the label. Or this is at least my interpretation
of "The per-association context value is empty." in section 4.2 in RFC
5764 - the one only extracts one single blob of data using the PRF of
the length given in that section (2 master keys and 2 master salts).
Hello,
I'm confused on what is a master key. For example the RFC lists:
SRTP_NULL_HMAC_SHA1_80
cipher: NULL
cipher_key_length: 0
cipher_salt_length: 0
maximum_lifetime: 2^31
auth_function: HMAC-SHA1
auth_key_length: 160
auth_tag_length: 80
but there is no master key size there. Is the master key size negotiated
through other means?