A User Centric Security Model for Tamper-Resistant Devices

C.1 Oine Attestation Mechanism
194 }
195 i f ( seedZero ( ) ) {
196 generateMACPrng ( tempSeed , cipherKey ) ;
197 } else {
198 ISOException . throwIt ( ( short ) 0xFA17) ;
199 }
200 }
201
202 private void generateResponse ( ) {
203 copyPointer = 0 ;
204 s e l f t e s t P r o c e s s ( ) ;
205 phDecryption ( ) ;
206 getSignatureKey ( ) ;
207 }
208
209 void phDecryption ( ) {
210 syCipher . i n i t ( phCipherKey , Cipher .MODE_DECRYPT, I n i t i a l i s a t i o n V e c t o r ,
211 ( short ) 0 , ( short ) 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 ) ;
212 syCipher . doFinal ( signatureKey , i n b u f f O f f s e t , inbuffLength ,
signatureKey ,
213 i n b u f f O f f s e t ) ;
214 }
215 void getSignatureKey ( ) {
216 RSAPrivateKey myPrivate = ( RSAPrivateKey ) this . phSCKeyPair . g e t P r i v a t e ( ) ;
217 short kLen = myPrivate . getExponent ( r e c e i v i n g B u f f e r , ( short )
218 ( copyPointer + ( short ) 2) ) ;
219 this . shortToBytes ( r e c e i v i n g B u f f e r , copyPointer , kLen ) ;
220 copyPointer += ( short ) ( kLen + ( short ) 2) ;
221 r e c e i v i n g B u f f e r [6]++;
222 copyPointer = U t i l . arrayCopyNonAtomic ( this . ModulusTag , ( short ) 0 ,
223 r e c e i v i n g B u f f e r , ( short ) ( copyPointer ) , ( short )
224 this . ModulusTag . l e n g t h ) ;
225 kLen = myPrivate . getModulus ( r e c e i v i n g B u f f e r , ( short )
226 ( copyPointer + ( short ) 2) ) ;
227 this . shortToBytes ( r e c e i v i n g B u f f e r , copyPointer , kLen ) ;
228 }
229
230 boolean seedZero ( ) {
231 for ( short i =0; i