A User Centric Security Model for Tamper-Resistant Devices

C.9 Platform Binding Protocol
401 }
402 return f a l s e ;
403 }
404 void parseMessage ( byte [ ] i n B u f f e r ) {
405 byte c h i l d L e f t = i n B u f f e r [ ( short ) ( this . CTLVDataOffset − ( short ) 1)
406 ] ;
407 short p o i n t e r = ( short ) this . CTLVDataOffset ;
408 try {
409 while ( c h i l d L e f t > 0) {
410 i f ( U t i l . arrayCompare ( SCADHChallengeTag , ( short ) 0 , i n B u f f e r ,
411 pointer , ( short ) 4) == 0) {
412 U t i l . arrayCopy ( i n B u f f e r , pointer , this . SCADHChanllengerArray ,
413 ( short ) 0 , ( short )
414 this . SCADHChanllengerArray . l e n g t h ) ;
415 p o i n t e r += ( short ) this . SCADHChanllengerArray . l e n g t h ;
416 } else i f ( U t i l . arrayCompare ( this . SCARandomNumberTag , ( short ) 0 ,
417 i n B u f f e r , pointer , ( short ) 4) == 0) {
418 U t i l . arrayCopyNonAtomic ( i n B u f f e r , pointer ,
419 this . SCARandomNumberArray , ( short ) 0 ,
420 ( short )
421 ( this . SCARandomNumberArray . l e n g t h ) ) ;
422 p o i n t e r += ( short ) ( this . SCARandomNumberArray . l e n g t h ) ;
423 } else i f ( U t i l . arrayCompare ( this . SCACookieTag , ( short ) 0 ,
424 i n B u f f e r , pointer , ( short ) 4) == 0) {
425 U t i l . arrayCopyNonAtomic ( i n B u f f e r , pointer ,
426 this . SCACookieArray , ( short ) 0 ,
427 ( short ) ( this . SCACookieArray . l e n g t h ) ) ;
428 p o i n t e r += ( short ) ( this . SCACookieArray . l e n g t h ) ;
429 }
430 c h i l d L e f t −= ( short ) 1 ;
431 }
432 } catch ( Exception cE ) {
433 ISOException . throwIt ( ( short ) c h i l d L e f t ) ;
434 }
435 }
436 void protocolImplementation ( ) {}
437 void d h I n i t i a l i s a t i o n ( ) {
438 dhKey . setModulus ( ClassDH . dhModulus , ( short ) 0 ,
( short ) ClassDH . dhModulus . l e n g t h ) ;
439 }
440 void dhKeyConGen(byte [ ] i n b u f f , short i n b u f f O f f s e t , byte Oper_Mode)
441 {
442 switch (Oper_Mode) {
443 case GEN_KEYCONTRIBUTION: randomExponent =
444 JCSystem . makeTransientByteArray ( ( short ) 32 ,
445 JCSystem .MEMORY_TYPE_TRANSIENT_DESELECT) ;
446 randomDataGen . generateData ( randomExponent , ( short ) 0 , ( short )
447 randomExponent . l e n g t h ) ;
448 dhKey . setExponent ( randomExponent , ( short ) 0 , ( short )
449 randomExponent . l e n g t h ) ;
450 pkCipher . i n i t ( dhKey , Cipher .MODE_ENCRYPT) ;
426