IBM Computer Hardware 2 User Manual download pdf (Page 454)

100

101

CCA Release 2.54

T1 T2 Tn-1 Tn

 

│ ┌──┴──┐ ┌──┴──┐ ┌──┴──┐

│││ ││││

│ ┌──┤ XOR │ ┌──┤ XOR │ ┌──┤ XOR │

│ │││ ││││││

│ │ └──┬──┘ │ └──┬──┘ │ └──┬──┘

│  │ │ 

││ │ │ ││ │

┌──┴──┐ │ ┌──┴──┐ │ ┌──┴──┐ │ ┌──┴──┐

│││ ││ │ │││ ││

KEY│ Enc │ │KEY│ Enc │ │KEY│ Enc │ │KEY│ Enc │

│││ ││ │ │││ ││

└──┬──┘ │ └──┬──┘ │ └──┬──┘ │ └──┬──┘

│O1 │ │O2 │ │On-1 │ │On

└───────┘ └────//─────┘ └───────┘ ├───(OCV)

│



ANSI X9.9 MAC

(and to decipher and

encipher for ANSI X9.19)

Figure D-11. MAC Calculation Method

D-14 IBM 4758 CCA Basic Services, Release 2.54, February 2005

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