c161c46d4c
Add some prose and a diagram describing the layout of the cipher IV for AES-CTR and AES-GCM and how it relates to the ESP IV stored in the packet after the ESP header. Also, remove an XXX comment about the initial block counter value used for AES-CTR in esp_output as the current code matches the RFC (and the equivalent code in esp_input didn't have the XXX comment). Discussed with: cem
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