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IXP400 Software
Access-Layer Components: Security (IxCryptoAcc) API
April 2005 IXP400 Software Version 2.0 Programmer’s Guide
100 Document Number: 252539, Revision: 007
7.4.2.2 Reference AH Dataflow
Figure 35 shows the example data flow for IP Security environment. Transport mode AH is used in
this example. IPSec client handles IP header mutable fields.
Figure 34. ESP Data Flow
Plain text
Plain Text
ESP
Header
ESP
Trailer
Cipher Text
ESP
Header
ESP
Trailer
Encrypt & Authenticate
Req (SA_ID, ...)
Encrypt & Authenticate
Req (SA_ID, ...)
Encyption Operation
Cipher Text
ESP
Header
ESP
Trailer
ESP
Auth
Cipher Text
ESP
Header
ESP
Trailer
ESP
Auth
Cipher Text
ESP
Header
ESP
Trailer
ESP
Auth
Forward authentication Operation
Plain Text
ESP
Header
ESP
Trailer
Application
IPSec Client
Access Component /
Intel XScale® Core
NPE
Processed by
IPSec client
Processed by
NPE
From Application
B2333-02