A User Centric Security Model for Tamper-Resistant Devices

C.8 Application Binding Protocol - Distributed
575 }
576 void messageEncryption ( byte [ ] i n b u f f , short i n b u f f O f f s e t , short
577 inbuffLength ) {
578 syCipher . i n i t ( phCipherKey , Cipher .MODE_ENCRYPT,
579 I n i t i a l i s a t i o n V e c t o r , ( short ) 0 , ( short )
580 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 ) ;
581 short temp ;
582 this . shortToBytes ( i n b u f f , ( short ) ( i n b u f f O f f s e t − 3) , temp =
583 ( short ) syCipher . doFinal ( i n b u f f , i n b u f f O f f s e t ,
584 inbuffLength , i n b u f f , i n b u f f O f f s e t ) ) ;
585 }
586 void phDecryption ( byte [ ] i n b u f f , short i n b u f f O f f s e t , short
587 inbuffLength ) {
588 syCipher . i n i t ( phCipherKey , Cipher .MODE_DECRYPT,
589 I n i t i a l i s a t i o n V e c t o r , ( short ) 0 , ( short )
590 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 ) ;
591 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 ,
592 i n b u f f O f f s e t ) ;
593 }
594 boolean macGenerate ( byte [ ] i n b u f f , short i n b u f f O f f s e t , short
595 inbuffLength , short macMode) {
596 i f (macMode == S i g n a t u r e .MODE_SIGN) {
597 phMacGenerator . i n i t ( phMacGeneratorKey , S i g n a t u r e .MODE_SIGN,
598 I n i t i a l i s a t i o n V e c t o r , ( short ) 0 , ( short )
599 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 ) ;
600 try {
601 copyPointer = U t i l . arrayCopyNonAtomic ( this . MACedDataTag ,
602 ( short ) 0 , this . r e c e i v i n g B u f f e r , copyPointer , ( short )
603 this . MACedDataTag . l e n g t h ) ;
604 copyPointer += 2 ;
605 } catch ( Exception ce ) {
606 ISOException . throwIt ( ( short ) 0xFA17) ;
607 }
608 try {
609 short l e n g t h = ( short ) phMacGenerator . s i g n
610 ( this . r e c e i v i n g B u f f e r , i n b u f f O f f s e t ,
611 inbuffLength , i n b u f f , copyPointer ) ;
612 this . shortToBytes ( i n b u f f , ( short ) ( copyPointer − ( short ) 2) ,
613 l e n g t h ) ;
614 copyPointer += l e n g t h ;
615 } catch ( Exception ce ) {
616 ISOException . throwIt ( ( short ) 0 x0987 ) ;
617 }
618 return true ;
619 } else i f (macMode == S i g n a t u r e .MODE_VERIFY) {
620 try {
621 phMacGenerator . i n i t ( phMacGeneratorKey , S i g n a t u r e .MODE_VERIFY,
622 I n i t i a l i s a t i o n V e c t o r , ( short ) 0 , ( short )
623 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 ) ;
624 return phMacGenerator . v e r i f y ( this . r e c e i v i n g B u f f e r ,
625 i n b u f f O f f s e t , inbuffLength , i n b u f f , ( short ) ( i n b u f f O f f s e t +
390