A User Centric Security Model for Tamper-Resistant Devices

C.11 Implementation Helper Classes
184 }
185 public s t a t i c void i n s t a l l ( byte bArray [ ] , short bOffset , byte
186 bLength ) {
187 new PrngSHA256 ( bArray , bOffset , bLength ) ;
188 }
189
190 byte [ ] generateMACPrng ( ) {
191 apduBuffer [ 0 ] = ( byte ) 0x02 ;
192 CyclicSeedFileRead ( apduBuffer ) ;
193 SHA256 . doFinal ( apduBuffer , ( short ) 0 , ( short ) (RECORD_SIZE + 1) ,
194 Buffer , ( short ) 0) ;
195 Xor ( apduBuffer , ( byte ) 1) ;
196 apduBuffer [ 0 ] = ( byte ) 0x03 ;
197 SHA256 . doFinal ( apduBuffer , ( short ) 0 , ( short ) (RECORD_SIZE + 1) ,
198 Buffer , ( short ) 0) ;
199 Xor ( apduBuffer , ( byte ) 1) ;
200 C y c l i c S e e d F i l e W r i t e ( apduBuffer ) ;
201 Adjuster ( ) ;
202 }
203 byte [ ] generateMACPrng ( byte [ ] I n p u t B u f f e r ) {
204 CyclicSeedFileRead ( I n p u t B u f f e r ) ;
205 SHA256 . doFinal ( inputBuffer , ( short ) 0 , ( short ) (RECORD_SIZE + 1) ,
206 Buffer , ( short ) 0) ;
207 Adjuster ( inputBuffer , B u f f e r ) ;
208 }
209
210 byte [ ] generateMACPrng ( byte [ ] InputBuffer , byte [ ] OutputBuffer ) {
211 CyclicSeedFileRead ( I n p u t B u f f e r ) ;
212 SHA256 . doFinal ( inputBuffer , ( short ) 0 , ( short ) (RECORD_SIZE + 1) ,
213 Buffer , ( short ) 0) ;
214 Adjuster ( OutputBuffer ) ;
215 }
216 }
449