A User Centric Security Model for Tamper-Resistant Devices

C.5 Secure and Trusted Channel Protocol Smart Card
331 }
332 }
333 void GenerateKeys ( byte [ ] i n b u f f ) {
334 byte [ ] DHSecretKey = null ;
335 try {
336 DHSecretKey =
337 this . myProtocolHelperObject . GenerateDHSessionKeyMaterial ( i n b u f f ,
0 ,
338 i n b u f f . l e n g t h ) ;
339 } catch ( Exception cE ) {
340 System . out . p r i n t l n (
341 " Exception At P r o t o c o l H e l p e r C l a s s . GenerateKeys :
" + cE . g e t C l a s s ( ) . getName ( ) ) ;
342 }
343 byte [ ] keyGenKey = new byte [ 1 6 ] ;
344 System . arraycopy ( DHSecretKey , 0 , keyGenKey , 0 , keyGenKey . l e n g t h ) ;
345 byte [ ] macInputValue = new byte [ 6 4 ] ;
346 System . arraycopy ( this . SPRandomNumber . getValueBytes ( ) , 0 ,
macInputValue ,
347 0 , 16) ;
348 System . arraycopy ( this . SCRandomNumber . getValueBytes ( ) , 0 ,
macInputValue ,
349 16 , 16) ;
350 System . arraycopy ( DHSecretKey , 16 , macInputValue , 32 , 16) ;
351 for ( int i = 4 8 ; i < 6 4 ; i ++) {
352 macInputValue [ i ] = ( byte ) 0x02 ;
353 }
354 try {
355 this . myProtocolHelperObject . GenerateMac ( macInputValue , 0 ,
356 macInputValue . length , this . mySessionEncryptionKey , 0 , keyGenKey ) ;
357 } catch ( Exception cE ) {
358 System . out . p r i n t l n ( " Exception at ProtocolHandler . GenerateKeys : " +
359 cE . g e t C l a s s ( ) . getName ( ) ) ;
360 }
361 for ( int i = 4 8 ; i < 6 4 ; i ++) {
362 macInputValue [ i ] = ( byte ) 0x03 ;
363 }
364 try {
365 this . myProtocolHelperObject . GenerateMac ( macInputValue , 0 ,
366 macInputValue . length , this . mySessionMacKey , 0 , keyGenKey ) ;
367 } catch ( Exception cE ) {
368 System . out . p r i n t l n ( " Exception at ProtocolHandler . GenerateKeys : " +
369 cE . g e t C l a s s ( ) . getName ( ) ) ;
370 }
371 }
372 }
332