A User Centric Security Model for Tamper-Resistant Devices

C.4 Secure and Trusted Channel Protocol Service Provider
394 }
395 }
396 void GenerateKeys ( byte [ ] i n b u f f ) {
397 byte [ ] DHSecretKey = null ;
398 try {
399 DHSecretKey =
400 this . myProtocolHelperObject . GenerateDHSessionKeyMaterial
401 ( i n b u f f , 0 , i n b u f f . l e n g t h ) ;
402 } catch ( Exception cE ) {
403 System . out . p r i n t l n (
404 " 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 ( ) ) ;
405 }
406 byte [ ] keyGenKey = new byte [ 1 6 ] ;
407 System . arraycopy ( DHSecretKey , 0 , keyGenKey , 0 , keyGenKey . l e n g t h ) ;
408 byte [ ] macInputValue = new byte [ 6 4 ] ;
409 System . arraycopy ( this . SPRandomNumber . getValueBytes ( ) , 0 ,
410 macInputValue , 0 , 16) ;
411 System . arraycopy ( this . SCRandomNumber . getValueBytes ( ) , 0 ,
412 macInputValue , 16 , 16) ;
413 System . arraycopy ( DHSecretKey , 16 , macInputValue , 32 , 16) ;
414 for ( int i = 4 8 ; i < 6 4 ; i ++) {
415 macInputValue [ i ] = ( byte ) 0x02 ;
416 }
417 try {
418 this . myProtocolHelperObject . GenerateMac ( macInputValue , 0 ,
419 macInputValue . length , this . mySessionEncryptionKey , 0 ,
420 keyGenKey ) ;
421 } catch ( Exception cE ) {
422 System . out . p r i n t l n (
423 " Exception at ProtocolHandler . GenerateKeys : " +
cE . g e t C l a s s ( ) . getName ( ) ) ;
424 }
425 for ( int i = 4 8 ; i < 6 4 ; i ++) {
426 macInputValue [ i ] = ( byte ) 0x03 ;
427 }
428 try {
429 this . myProtocolHelperObject . GenerateMac ( macInputValue , 0 ,
430 macInputValue . length , this . mySessionMacKey , 0 , keyGenKey ) ;
431 } catch ( Exception cE ) {
432 System . out . p r i n t l n (
433 " Exception at ProtocolHandler . GenerateKeys : " +
cE . g e t C l a s s ( ) . getName ( ) ) ;
434 }
435 }
436 }
312