A User Centric Security Model for Tamper-Resistant Devices

C.5 Secure and Trusted Channel Protocol Smart Card
480 0) ;
481 this . phCipherKey . setKey ( SCSPDHGeneratedValue , ( short ) 0) ;
482 for ( short i = 4 8 ; i < 6 4 ; i ++) {
483 keyGenMacData [ i ] = ( byte ) 0x03 ;
484 }
485 phMacGenerator . i n i t ( sessionGenKey , S i g n a t u r e .MODE_SIGN,
486 I n i t i a l i s a t i o n V e c t o r , ( short ) 0 , ( short )
487 I n i t i a l i s a t i o n V e c t o r . l e n g t h ) ;
488 phMacGenerator . s i g n ( keyGenMacData , ( short ) 0 , ( short )
489 keyGenMacData . length , SCSPDHGeneratedValue ,
( short )
490 0) ;
491 this . phMacGeneratorKey . setKey ( SCSPDHGeneratedValue , ( short ) 0) ;
492 SCSPDHGeneratedValue = null ;
493 JCSystem . r e q u e s t O b j e c t D e l e t i o n ( ) ;
494 }
495 void messageEncryption ( byte [ ] i n b u f f , short i n b u f f O f f s e t , short
496 inbuffLength ) {
497 syCipher . i n i t ( phCipherKey , Cipher .MODE_ENCRYPT, I n i t i a l i s a t i o n V e c t o r ,
498 ( short ) 0 , ( short ) I n i t i a l i s a t i o n V e c t o r . l e n g t h ) ;
499 this . shortToBytes ( i n b u f f , ( short ) ( i n b u f f O f f s e t − 3) , ( short )
500 syCipher . doFinal ( i n b u f f , i n b u f f O f f s e t , inbuffLength ,
501 i n b u f f , i n b u f f O f f s e t ) ) ;
502 }
503 void phDecryption ( byte [ ] i n b u f f , short i n b u f f O f f s e t , short inbuffLength )
504 {
505 syCipher . i n i t ( phCipherKey , Cipher .MODE_DECRYPT, I n i t i a l i s a t i o n V e c t o r ,
506 ( short ) 0 , ( short ) I n i t i a l i s a t i o n V e c t o r . l e n g t h ) ;
507 syCipher . doFinal ( i n b u f f , i n b u f f O f f s e t , inbuffLength , i n b u f f ,
508 i n b u f f O f f s e t ) ;
509 }
510 boolean macGenerate ( byte [ ] i n b u f f , short i n b u f f O f f s e t , short
511 inbuffLength , short macMode) {
512 i f (macMode == S i g n a t u r e .MODE_SIGN) {
513 phMacGenerator . i n i t ( phMacGeneratorKey , S i g n a t u r e .MODE_SIGN,
514 I n i t i a l i s a t i o n V e c t o r , ( short ) 0 , ( short )
515 I n i t i a l i s a t i o n V e c t o r . l e n g t h ) ;
516 try {
517 copyPointer = U t i l . arrayCopyNonAtomic ( this . MACedDataTag , ( short ) 0 ,
518 this . r e c e i v i n g B u f f e r , copyPointer , ( short )
519 this . MACedDataTag . l e n g t h ) ;
520 copyPointer += 2 ;
521 } catch ( Exception ce ) {
522 ISOException . throwIt ( ( short ) 0xFA17) ;
523 }
524 try {
525 short l e n g t h = ( short ) phMacGenerator . s i g n ( this . r e c e i v i n g B u f f e r ,
526 i n b u f f O f f s e t , inbuffLength , i n b u f f , copyPointer ) ;
527 this . shortToBytes ( i n b u f f , ( short ) ( copyPointer − ( short ) 2) ,
l e n g t h ) ;
528 copyPointer += l e n g t h ;
323