A User Centric Security Model for Tamper-Resistant Devices

C.3 Attestation Protocol
204 ( this . EncryptedData . getValueBytes ( ) , 0 ,
205 this . EncryptedData . getValueBytes ( ) . length ,
206 this . EncryptedData . getBytesTlvRepresentation ( ) , 7 ,
207 this . mySessionEncryptionKey ) ;
208 this . childExtractionFromCTLV ( EncryptedData ) ;
209 i f ( Arrays . e q u a l s ( PlatformHashPreset ,
210 this . PlatformHash . getValueBytes ( ) ) ) {}
211 else {
212 System . out . p r i n t l n ( " Platform Digest Not V e r i f i e d " ) ;
213 }
214 childExtractionFromCTLV ( this . S C C e r t i f i c a t e ) ;
215 B i g I n t e g e r SCpublicExponent = new B i g I n t e g e r ( byteToString
216 ( this . PublicExponent . getValueBytes ( ) ) , 16) ;
217 B i g I n t e g e r SCpublicModulus = new B i g I n t e g e r ( byteToString
218 ( this . PublicModulus . getValueBytes ( ) ) , 16) ;
219 KeyFactory f a c t o r y = KeyFactory . g e t I n s t a n c e ( "RSA" ) ;
220 SCVerificationKey = ( PublicKey ) f a c t o r y . g e n e r a t e P u b l i c (new
221 RSAPublicKeySpec ( SCpublicModulus ,
222 SCpublicExponent ) ) ;
223 temp = new byte [ ( this . PlatformHash . getTagLength ( ) +
224 this . SCIdentity . getTagLength ( ) +
225 this . SCRandomNumber . getTagLength ( ) +
226 this . CMRandomNumber . getTagLength ( ) ) ] ;
227 System . arraycopy ( this . EncryptedData . getBytesTlvRepresentation ( ) ,
7 ,
228 temp , 0 , temp . l e n g t h ) ;
229 i f ( this . myProtocolHelperObject . SignatureMethod ( temp , 0 ,
230 temp . length , this . SignedData . getValueBytes ( ) , 0 ,
231 SCVerificationKey ,
P r o t o c o l H e l p e r C l a s s .SIGN_MODE_VERIFICATION) )
232 {}
233 else {
234 System . out . p r i n t l n (
235 " S i g n a t u r e V e r i f i c a t i o n F a i l e d . . . . . . Check
code " ) ;
236 }
237 }
238 } catch ( Exception cE ) {
239 System . out . p r i n t l n ( " Error i n ProtocolHandler . inMessageProcessing : "
240 + cE . g e t C l a s s ( ) . getName ( ) ) ;
241 }
242 return true ;
243 }
244 public s t a t i c S t r i n g byteToString ( byte [ ] inArray ) {
245 byte [ ] HEX_CHAR_TABLE = {
246 ( byte ) ' 0 ' , ( byte ) ' 1 ' , ( byte ) ' 2 ' , ( byte ) ' 3 ' , ( byte ) ' 4 ' , ( byte ) ' 5 ' ,
247 ( byte ) ' 6 ' , ( byte ) ' 7 ' , ( byte ) ' 8 ' , ( byte ) ' 9 ' , ( byte ) ' a ' , ( byte ) ' b ' ,
248 ( byte ) ' c ' , ( byte ) ' d ' , ( byte ) ' e ' , ( byte ) ' f '
249 } ;
250 byte [ ] hex = new byte [ 2 ∗ inArray . l e n g t h ] ;
251 int index = 0 ;
287