+ // tag nonce.\r
+ memcpy(enc_b,receivedAnswer+1,8);\r
+\r
+ // decrypt nonce.\r
+ tdes_2key_dec(b, enc_b, 8, key );\r
+\r
+ Dbprintf("enc_B: %02x %02x %02x %02x %02x %02x %02x %02x", enc_b[0],enc_b[1],enc_b[2],enc_b[3],enc_b[4],enc_b[5],enc_b[6],enc_b[7] );\r
+ Dbprintf(" B: %02x %02x %02x %02x %02x %02x %02x %02x", b[0],b[1],b[2],b[3],b[4],b[5],b[6],b[7] );\r
+ rol(b,8);\r
+ \r
+ memcpy(ab ,a,8);\r
+ memcpy(ab+8,b,8);\r
+\r
+ Dbprintf("AB: %02x %02x %02x %02x %02x %02x %02x %02x", ab[0],ab[1],ab[2],ab[3],ab[4],ab[5],ab[6],ab[7] );\r
+ Dbprintf("AB: %02x %02x %02x %02x %02x %02x %02x %02x", ab[8],ab[9],ab[10],ab[11],ab[12],ab[13],ab[14],ab[15] );\r
+\r
+ // encrypt\r
+ tdes_2key_enc(enc_ab, ab, 16, key);\r
+\r
+ Dbprintf("e_AB: %02x %02x %02x %02x %02x %02x %02x %02x", enc_ab[0],enc_ab[1],enc_ab[2],enc_ab[3],enc_ab[4],enc_ab[5],enc_ab[6],enc_ab[7] );\r
+ Dbprintf("e_enc_ab: %02x %02x %02x %02x %02x %02x %02x %02x", enc_ab[8],enc_ab[9],enc_ab[10],enc_ab[11],enc_ab[12],enc_ab[13],enc_ab[14],enc_ab[15] );\r
+\r
+ len = mifare_sendcmd_short_mfucauth(NULL, 1, 0xAF, enc_ab, receivedAnswer, receivedAnswerPar, NULL);\r
+ if (len != 11) {\r
+ if (MF_DBGLEVEL >= MF_DBG_ERROR) Dbprintf("Cmd Error: %02x", receivedAnswer[0]);\r
+ OnError(1);\r
+ return;\r
+ }\r
+\r
+ // the tags' encryption of our nonce, A.\r
+ memcpy(enc_key, receivedAnswer+1, 8);\r
+ \r
+ // clear B.\r
+ memset(b, 0x00, 8);\r
+\r
+ // decrypt \r
+ tdes_2key_dec(b, enc_key, 8, key );\r
+ if ( memcmp(a, b, 8) == 0 )\r
+ Dbprintf("Verified key");\r
+ else\r
+ Dbprintf("failed authentication");\r
+ \r
+ Dbprintf("a: %02x %02x %02x %02x %02x %02x %02x %02x", a[0],a[1],a[2],a[3],a[4],a[5],a[6],a[7] );\r
+ Dbprintf("b: %02x %02x %02x %02x %02x %02x %02x %02x", b[0],b[1],b[2],b[3],b[4],b[5],b[6],b[7] );\r
+ }\r
+\r
+ if( mifare_ultra_readblock(blockNo, dataout) ) {\r
+ if (MF_DBGLEVEL >= MF_DBG_ERROR) Dbprintf("Read block error");\r
+ OnError(2);\r
+ return;\r
+ }\r
+\r
+ if( mifare_ultra_halt() ) {\r
+ if (MF_DBGLEVEL >= MF_DBG_ERROR) Dbprintf("Halt error");\r
+ OnError(3);\r
+ return;\r
+ }\r
+ \r
+ cmd_send(CMD_ACK,1,0,0,dataout,16);\r
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);\r
+ LEDsoff();\r
+}\r