LIFM algorithm for security association database lookup in IPSEC application
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United States of America Patent
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Aug 29, 2006
Grant Date -
Jul 3, 2003
app pub date -
Apr 19, 2002
filing date -
Dec 28, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Current applications used in security system for encryption/decryption/authentication require intense CPU computation for an SAD search. Therefore, a part of the SAD is planted into an ASIC in order to lessen the load of the CPU.The invention provides a high-performance lookup method that is 'LIFM' adapted to the ASIC. Initially, the ASIC makes a perfect match by comparing the SAD_index field of all items allocated in the ASIC with an incoming packet to fetch the required SAD_key. If there is no match, the software and hardware are started by issuing an interrupt from the ASIC until the CPU finds a perfectly matched item. Then, the software level updates the perfectly matched item in the ASIC.
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