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3.1.6.12 SendBaseSymmetricKeyCache Cleanup Timer Event

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When the SendBaseSymmetricKeyCache Cleanup Timer (section 3.1.2.12) expires, the protocol MUST apply the following logic, where CURRENT_TIME represents the current system time. This value is the number of seconds elapsed since midnight (00:00:00), January 1, 1970 (UTC) according to the system clock.

  • For each CachedSymmetricKey (section 3.1.1.3.3) ADM element instance rCachedSymmetricKey in the SendBaseSymmetricKeyCache ADM element, if rCachedSymmetricKey.CachedTime is less than CURRENT_TIME minus the value of the SymmetricKeyShortLifetime ADM element, the CachedSymmetricKey ADM element instance referenced by rCachedSymmetricKey MUST be deleted from the SendBaseSymmetricKeyCache ADM element.

  • If the SendBaseSymmetricKeyCache ADM element is not empty, the CachedSymmetricKey ADM element instance with the oldest CachedTime ADM attribute value MUST be found. The SendBaseSymmetricKeyCache Cleanup Timer MUST be restarted with a duration of the value of the SymmetricKeyShortLifetime ADM element plus one minute minus the difference between CURRENT_TIME and the oldest CachedTime ADM attribute value.