Hi I am implementing SRTP and have little confusion about it. as per my understanding of SRTP RFC3711, Initialization vector(IV) is generated as
IV = (salt_key << 16) XOR (SSRC << 64) XOR (packet_index << 16) and keystream segment (required for AES ICM ) is generated as Keystream_seg = E(k,IV) where k=Session key i.e Keystream_seg = k XOR IV is my understanding correct wrt SRTP standard?? Wherein AES ICM RFC3686, keystream segment consists keystream_seg = NONCE || IV || Counter where Counter advances from initial val=0. I mean how to relate these keystream_seg forming units in AES ICM(NONCE,IV,Counter) with SRTP header fields & fields computed from them?? Second, how should i generate Master Key on sender side??And how to derive session keys from Master Key?? Thanks in advance!! Thanks & Regards Yogesh Patil A R I C E N T "DISCLAIMER: This message is proprietary to Aricent and is intended solely for the use of the individual to whom it is addressed. It may contain privileged or confidential information and should not be circulated or used for any purpose other than for what it is intended. If you have received this message in error,please notify the originator immediately. If you are not the intended recipient, you are notified that you are strictly prohibited from using, copying, altering, or disclosing the contents of this message. Aricent accepts no responsibility for loss or damage arising from the use of the information transmitted by this email including damage from virus." _______________________________________________ Ccrtp-devel mailing list [email protected] http://lists.gnu.org/mailman/listinfo/ccrtp-devel
