Key Reference Tag Len A4 06 in Java

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Key Reference Tag Len A4 06
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This key reference template is TRUE only if PIN #1 has been authenticated It doesn t explicitly say where PIN #1 is stored or which PIN #1 is being referenced in case there is more than one on the card
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The assumption is that the current context on the card for example, which application is running or what the current directory is resolves any ambiguity about exactly which Key #1 is being referenced, where it is stored, and whether or not it has been authenticated More about this later
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Boolean Expressions of Key References
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There are two templates used to assemble key references into Boolean expressions of TLVs: an AND template and an OR template As we mentioned, for some reason there is no NOT TLV, which unfortunately means that you can t always put the Boolean expressions in your access control rules into normal forms The AND template starts out with the tag AF and the OR template starts out with tag A0 The value field is then simply what is being AND d or OR d together and can of course contain AND and OR TLVs For example, to simply say Key #1 and Key #2 you d use the codes in Table 14-6 TABLE 14-6 A Boolean Expression in Key References
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Key Reference Tag Length Key Index Tag Key Reference Tag Length Key Index Key Tag Length Reference
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AND Tag Length
Length
Key Reference
An extended format security condition that said Key #1 OR (Key #2 AND Key #3) would be coded like this: A0 11 A4 03 83 01 01 AF 0A A4 03 83 01 02 A4 03 83 01 03 One of the advantages of this Polish representation of Boolean expressions is that they are programmatically easy to evaluate Setting aside all of the TLV cruft, here s one way to code it:
The ETSI Smart Card Platform
#define TRUE 1 #define FALSE 0 #define OR #define AND #define END -1 -2 0
int expression[] = {OR, 1, AND, 2, 3, END, END}; int *bexp = &expression[0]; int beval(), term(); void main() { printf("%s\n\n", beval() "TRUE" : "FALSE"); } int beval() { int e, op; op = *bexp++; while(*bexp) { e = (*bexp < 0) beval() : term(*(bexp++)); if(((op == OR) && e) || ((op == AND) && ~e)) break; } while(*(bexp++)); return e; } int v[] = {-1,0,0,1}; int term(keyReference) { return v[keyReference]; }
14
In this little code fragment, term(keyReference) returns TRUE if the key reference has been authenticated and FALSE otherwise In this example, we hardwired the authentication of key reference 3
Key Reference Semantics
A key reference is just a name On some cards such as the Microsoft card, a key reference is associated with the actual name of an entity that can be authenticated like Sally Green or Citibank In the essentially singleapplication ISO 7816 series of standards, the semantics of key references are left undefined because who or what is associated with a particular key reference on one card can be totally different from who or what is associated with the same key reference on another card The association between a key reference and a particular authenticable entity is a matter of coordination between the card and the application using it Showing its ancestral roots in telecommunications, the application that the UICC most recently had to coordinate with was the mobile telephone handset Before the advent of the SAT, the handset had conducted the authentication protocols so it was important that the handset and the SIM agreed on who was being authenticated Table 14-7 shows the current UICC mapping between key reference values and authenticable entities TABLE 14-7 Key Reference Semantics for the UICC Key Reference Value 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x0A
Authenticable Entity/ Known Principal Primary PIN of Application 1 Primary PIN of Application 2 Primary PIN of Application 3 Primary PIN of Application 4 Primary PIN of Application 5 Primary PIN of Application 6 Primary PIN of Application 7 Primary PIN of Application 8 Administrator 1
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