A User Centric Security Model for Tamper-Resistant Devices

C.5 Secure and Trusted Channel Protocol Smart Card
186 public void p r o c e s s (APDU apdu )throws ISOException {
187 byte [ ] apduBuffer = apdu . g e t B u f f e r ( ) ;
188 i f ( s e l e c t i n g A p p l e t ( ) ) {
189 this . i n i t i a l i s e P r o t o c o l ( ) ;
190 return ;
191 }
192 i f ( apduBuffer [ ISO7816 .OFFSET_CLA] != CLA) {
193 ISOException . throwIt (SW_CLASSNOTSUPPORTED) ;
194 }
195 i f ( apduBuffer [ ISO7816 .OFFSET_INS] == I n i t i a t i o n P r o t o c o l ) {
196 r e c e i v i n g B u f f e r = JCSystem . makeTransientByteArray ( ( short ) 64 ,
197 JCSystem .MEMORY_TYPE_TRANSIENT_DESELECT) ;
198 generateResponse ( ( short ) 1) ;
199 apdu . setOutgoing ( ) ;
200 apdu . setOutgoingLength ( ( short ) copyPointer ) ;
201 apdu . sendBytesLong ( r e c e i v i n g B u f f e r , ( short ) 0 , ( short ) copyPointer ) ;
202 return ;
203 }
204 r e c e i v i n g B u f f e r = null ;
205 b y t e s L e f t = 0 ;
206 b y t e s L e f t = apdu . getIncomingLength ( ) ;
207 r e c e i v i n g B u f f e r = JCSystem . makeTransientByteArray ( bytesLeft ,
208 JCSystem .MEMORY_TYPE_TRANSIENT_DESELECT) ;
209 readCount = ( short ) ( ( short ) apdu . setIncomingAndReceive ( ) ) ;
210 rCount = 0 ;
211 i f ( b y t e s L e f t > 0) {
212 rCount = U t i l . arrayCopyNonAtomic ( apduBuffer ,
213 ISO7816 .OFFSET_EXT_CDATA, r e c e i v i n g B u f f e r , rCount , readCount ) ;
214 b y t e s L e f t −= readCount ;
215 }
216 while ( b y t e s L e f t > 0) {
217 try {
218 readCount = apdu . r e c e i v e B y t e s ( ( short ) 0) ;
219 rCount = U t i l . arrayCopyNonAtomic ( apduBuffer , ( short ) 0 ,
220 r e c e i v i n g B u f f e r , rCount , readCount ) ;
221 b y t e s L e f t −= readCount ;
222 } catch ( Exception aE) {
223 ISOException . throwIt ( ( short ) 0x7AAA) ;
224 }
225 }
226 i f ( this . r e c e i v i n g B u f f e r [ 3 ] == this . MessageHandlerTagOne [ 3 ] ) {
227 try {
228 parseMessage ( r e c e i v i n g B u f f e r ) ;
229 } catch ( Exception cE ) {
230 ISOException . throwIt ( ( short ) 0xA112 ) ;
231 }
232 r e c e i v i n g B u f f e r = JCSystem . makeTransientByteArray ( ( short ) 600 ,
233 JCSystem .MEMORY_TYPE_TRANSIENT_DESELECT) ;
234 generateResponse ( ( short ) 2) ;
235 JCSystem . r e q u e s t O b j e c t D e l e t i o n ( ) ;
236 apdu . setOutgoing ( ) ;
317