A User Centric Security Model for Tamper-Resistant Devices

C.4 Secure and Trusted Channel Protocol Service Provider
473 U t i l . arrayCopy ( i n B u f f e r , pointer , this . SPDHChanllengerArray ,
474 ( short ) 0 , ( short )
475 this . SPDHChanllengerArray . l e n g t h ) ;
476 p o i n t e r += ( short ) this . SPDHChanllengerArray . l e n g t h ;
477 } else i f ( U t i l . arrayCompare ( this . SPRandomNumberTag , ( short ) 0 ,
478 i n B u f f e r , pointer , ( short ) 4) == 0) {
479 U t i l . arrayCopyNonAtomic ( i n B u f f e r , pointer ,
480 this . SPRandomNumberArray , ( short ) 0 ,
481 ( short )
482 ( this . SPRandomNumberArray . l e n g t h ) ) ;
483 p o i n t e r += ( short ) ( this . SPRandomNumberArray . l e n g t h ) ;
484 } else i f ( U t i l . arrayCompare ( this . SPCookieTag , ( short ) 0 ,
485 i n B u f f e r , pointer , ( short ) 4) == 0) {
486 U t i l . arrayCopyNonAtomic ( i n B u f f e r , pointer ,
487 this . SPCookieArray , ( short ) 0 ,
488 ( short ) ( this . SPCookieArray . l e n g t h ) ) ;
489 p o i n t e r += ( short ) ( this . SPCookieArray . l e n g t h ) ;
490 }
491 c h i l d L e f t −= ( short ) 1 ;
492 }
493 } catch ( Exception cE ) {
494 ISOException . throwIt ( ( short ) c h i l d L e f t ) ;
495 }
496 }
497 void protocolImplementation ( ) {}
498 void d h I n i t i a l i s a t i o n ( ) {
499 dhKey . setModulus ( ClassDH . dhModulus , ( short ) 0 ,
( short ) ClassDH . dhModulus . l e n g t h ) ;
500 }
501 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)
502 {
503 switch (Oper_Mode) {
504 case GEN_KEYCONTRIBUTION: randomExponent =
505 JCSystem . makeTransientByteArray ( ( short ) 32 ,
506 JCSystem .MEMORY_TYPE_TRANSIENT_DESELECT) ;
507 randomDataGen . generateData ( randomExponent , ( short ) 0 , ( short )
508 randomExponent . l e n g t h ) ;
509 dhKey . setExponent ( randomExponent , ( short ) 0 , ( short )
510 randomExponent . l e n g t h ) ;
511 pkCipher . i n i t ( dhKey , Cipher .MODE_ENCRYPT) ;
512 pkCipher . doFinal ( ClassDH . dhBase , ( short ) 0 ,
( short ) ClassDH . dhBase . length , i n b u f f ,
513 i n b u f f O f f s e t ) ;
514 break ;
515 case GEN_DHKEY:
516 try {
517 dhKey . setExponent ( randomExponent , ( short ) 0 , ( short )
518 randomExponent . l e n g t h ) ;
519 pkCipher . i n i t ( dhKey , Cipher .MODE_ENCRYPT) ;
520 SCSPDHGeneratedValue = JCSystem . makeTransientByteArray (
521 ( short ) ClassDH . dhModulus . length ,
300