IBM Computer Hardware 2 Manuale Utente Scaricare il pdf (Pagina 435)

100

101

CCA Release 2.54

 CVil is the control vector for the left half of the target input PIN-block

encrypting key.

e*Km⊕CViml(Kt⊕CVir)  e*Km⊕CVimr(Kt⊕CVir)

where:

 CVir is the control vector for the right half of the target input PIN-block

encrypting key.

2. Use the Key_Token_Build verb to build source (external) and target (internal)

key tokens with:

 eKt(Kp)  eKt(Kp)

 CVil  CVil

3. Use Key_Import and the first of the IMPORTER keys to import the left half of

the target key (discard the right half).

4. Use the Key_Token_Build verb to build source (external) and target (internal)

key tokens with:

 eKt(Kp)  eKt(Kp)

 CVir  CVir

5. Use Key_Import and the second of the IMPORTER keys to import the right half

of the target key (discard the left half).

6. Concatenate the two key halves. You can use the Key_Token_Parse and

Key_Token_Build verbs to parse and build the required key tokens.

Appendix C. CCA Control-Vector Definitions and Key Encryption C-19

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