我正在尝试模拟PoS，销售点:)，系统并完成与2013 Nexus 7（无安全元素）v4.4.2上运行的Google钱包的交易。
我的PoS原型也在2013 Nexus 7 v4.4.2上运行。
我可以从2PAY_SYS_DDF01请求中获得NFC响应。 我可以选择MasterCard应用程序ID。 我能够获得处理选项。 当我读取记录时，看起来谷歌钱包不会返回所有强制性EMV字段。 最后，当我请求Generate AC命令时，它总是返回6D00不支持。
有问题的代码区域：
//set P1 to '40', to request an Transaction Certificate (offline transaction)
//and execute the Generate AC command.
byte[] generateAC = new byte[] {(byte)0x80, (byte)0xAE, 0x40, 0x00,
0x1D, //data length
0x00, 0x00, 0x00, 0x00, 0x00, 0x01, //amount1
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //amount2
0x08, 0x40, //term country
0x00, 0x00, 0x00, 0x00, 0x00, //tvr
0x09, 0x62, //tx curr
0x14, 0x04, 0x1B, //tx date
0x00, //tx type
0x12, 0x34, 0x56, 0x78, //random
0x00}; //le
response = isoDep.transceive(generateAC);
我关注的是蒂姆贝克斯的视频 https://www.youtube.com/watch?v=qqobg1-HrfY 约。 46分钟。 和Tim Beckers代码示例： https://github.com/a2800276/29c3/blob/master/smartshell.rb
更新
对GPO命令（80 a8 00 00 02 83 00 00）的响应是
770a820200009404080101009000
77 Response Message Template Format 2
82 Application Interchange Profile
0000
94 Application File Locator (AFL)
08010100
更新
我试过了：
byte[] computeCC = new byte[] {
(byte)0x80, // CLA = proprietary
(byte)0x2A, // INS = COMPUTE CRYPTOGRAPHIC CHECKSUM
(byte)0x8E, // P1
(byte)0x80, // P2
(byte)0x04, // Lc
(byte)0x00, 0x00, (byte)0x00, (byte)0x99, // Unpredicatable Number (numeric)
(byte)0x00, // Le
};
response = isoDep.transceive(computeCC);
希望至少得到一个错误，指出错误的不可预测的数字，但我得到了6700错误的长度。
之前我收到了对Read Record 00 B2 01 0C 00的回复 部分回应是 卡认证相关数据[9F69]： 数据（二进制）：XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX fDDA版本号：9F （卡）不可预测的数字：6A 04 9F 7E
所以我尝试了不可预测的数字
byte[] computeCC = new byte[] {
(byte)0x80, // CLA = proprietary
(byte)0x2A, // INS = COMPUTE CRYPTOGRAPHIC CHECKSUM
(byte)0x8E, // P1
(byte)0x80, // P2
(byte)0x04, // Lc
(byte)0x6A, 0x04, (byte)0x9F, (byte)0x7E, // Unpredicatable Number (numeric)
(byte)0x00, // Le
};
response = isoDep.transceive(computeCC);
但我仍然得到6700错误的长度
更新
对READ RECORD（Record = 1，SFI = 1）命令的响应（00 B2 01 0C 00） 是：
70 7c 9f 6c 02
00 01 9f 62 06
00 00 00 00 00
38 9f 63 06 00
00 00 00 03 c6
56 29 42 35 33
39 36 XX XX XX
XX 31 XX XX 39
XX XX XX XX 5e
20 2f 5e 31 34
30 37 31 30 31
34 30 31 30 30
30 30 30 30 30
30 30 30 9f 64
01 04 9f 65 02
00 38 9f 66 02
03 c6 9f 6b 13
53 96 XX XX 1X
X9 XX XX d1 40
71 01 40 10 00
00 00 00 0f 9f
67 01 04 9f 69
0f 9f 6a 04 9f
7e 01 9f 02 06
5f 2a 02 9f 1a
02 90 00
--------------------------TLV-------------------------------
Output:
READ RECORD Response Message Template [70]:
Card Transaction Qualifiers (CTQ) [9F6C]:
Data (Binary): 00 01
Bit flags set:
1Bxb8: 0 - Online PIN not Required
1Bxb7: 0 - Signature Not Required
1Bxb6: 0 - Not applicable: Go Online if Offline Data Authentication Fails and Reader is online capable.
1Bxb5: 0 - Not applicable: Switch Interface if Offline Data Authentication fails and Reader supports VIS.
1Bxb4: 0 - Not applicable: Go Online if Application Expired
1Bxb3: 0 - Not applicable: Switch Interface for Cash Transactions
1Bxb2: 0 - Not applicable: Switch Interface for Cashback Transactions
1Bxb1: 0 - RFU
2Bxb8: 0 - Consumer Device CVM not Performed
2Bxb7: 0 - Card doesn't support Issuer Update Processing at the POS
2Bxb6: 0 - RFU
2Bxb5: 0 - RFU
2Bxb4: 0 - RFU
2Bxb3: 0 - RFU
2Bxb2: 0 - RFU
2Bxb1: 1 - RFU
PCVC3 (Track1) [9F62]:
Data (Binary): 00 00 00 00 00 38
Offline Counter Initial Value [9F63]:
Data (Binary): 00 00 00 00 03 C6
Track 1 Data [56]:
Data (ASCII): B5396XXXXXXXXXXXX^ /^14071014010000000000
NATC (Track1) [9F64]:
Data (Binary): 04
PCVC3 (Track2) [9F65]:
Data (Binary): 00 38
Terminal Transaction Qualifiers (TTQ) [9F66]:
Data (Binary): 03 C6
Card CVM Limit [9F6B]:
Data (Binary): 53 96 48 50 17 69 62 32 D1 40 71 01 40 10 00 00 00 00 0F
MSD Offset [9F67]:
Data (Binary): 04
Card Authentication Related Data [9F69]:
Data (Binary): 9F 6A 04 9F 7E 01 9F 02 06 5F 2A 02 9F 1A 02
fDDA Version Number: 9F
(Card) Unpredictable Number: 6A 04 9F 7E
Card Transaction Qualifiers: 01 9F
----------------------------------------
答案 0 :(得分：3)
对GET PROCESSING OPTIONS命令的响应指示以下应用程序交换配置文件（AIP）：
82 Application Interchange Profile
0000
Google电子钱包基本上是万事达卡（EMV非接触式内核2），因此根据内核2的规则解码AIP会产生以下结果：
Byte 1, b7 = 0: no SDA supported
b6 = 0: no DDA supported
b5 = 0: no cardholder verification supported
b4 = 0: no terminal risk management to be performed
b3 = 0: no issuer authentication supported
b2 = 0: no on-device cardholder verification supported
b1 = 0: no CDA supported
Byte 2, b8 = 0: no EMV mode supported
重要部分是字节2，位8：表示您的卡不支持EMV模式。因此，您的卡/ Google电子钱包是一张仅支持Mag-Stripe模式的PayPass卡。因此，您无法使用GENERATE AC验证事务。相反，您只能使用COMPUTE CRYPTOGRAPHIC CHECKSUM让卡生成动态卡验证码（CVC3）：
byte[] computeCC = new byte[] {
(byte)0x80, // CLA = proprietary
(byte)0x2A, // INS = COMPUTE CRYPTOGRAPHIC CHECKSUM
(byte)0x8E, // P1
(byte)0x80, // P2
(byte)0x04, // Lc
(byte)0xWW, (byte)0xXX, (byte)0xYY, (byte)0xZZ, // Unpredicatable Number (numeric)
(byte)0x00, // Le
};
response = isoDep.transceive(computeCC);
请注意，COMPUTE CRYPTOGRAPHIC CHECKSUM命令的数据字段必须根据UDOL填充值（如果没有UDOL，则默认UDOL为9F6A04，表示不可预测的数字，数字）。 / p>
不可预测的数字（数字）是由磁条数据文件定义的范围内的BCD编码数字（参见AFL）。过去，对于Google电子钱包，这是0到99之间的值（即WW='00'，XX='00'，YY='00'，ZZ='00'..'99'）。
<强>更新
从卡上读取的数据解码如下：
70 7c
9f6c 02 Mag-stripe application version number = Version 1
00 01
9f62 06 Track 1 bit map for CVC3
00 00 00 00 00 38
9f63 06 Track 1 bit map for UN and ATC
00 00 00 00 03 c6
56 29 Track 1 data
42 ISO/IEC 7813 structure "B" format
35333936 XXXXXXXX 31XXXX39 XXXXXXXX PAN (ASCII)
5e Field separator "^"
202f Cardholder name " /" (empty, see MC requirements)
5e Field separator "^"
31343037 Expiry date "14"/"07"
313031 Service code "101"
34303130303030303030303030 Track 1 discretionary data
9f64 01 Track 1 number of ATC digits
04
9f65 02 Track 2 bit map for CVC3
00 38
9f66 02 Track 2 bit map for UN and ATC
03 c6
9f6b 13 Track 2 data
5396 XXXX 1XX9 XXXX PAN (BCD)
d Field separator
1407 Expiry date
101 Service code
4010000000000 Track 2 discretionary data
f Padding
9f67 01 Track 2 number of ATC digits
04
9f69 0f UDOL
9f6a 04 Unpredictable number (numeric)
9f7e 01 Mobile support indicator
9f02 06 Amount authorized (numeric)
5f2a 02 Transaction currency code
9f1a 02 Terminal country code
因此卡 提供UDOL。因此，必须相应地调整COMPUTE CRYPTOGRAPHIC CHECKSUM命令：
byte[] computeCC = new byte[] {
(byte)0x80, // CLA = proprietary
(byte)0x2A, // INS = COMPUTE CRYPTOGRAPHIC CHECKSUM
(byte)0x8E, // P1
(byte)0x80, // P2
(byte)0x0F, // Lc
// 9f6a 04 Unpredictable number (numeric)
(byte)0x00, (byte)0x00, (byte)0x00, (byte)0x12, // two digits according to UN/ATC bit map and number of ATC digits: 6 - 4 = 2
// 9f7e 01 Mobile support indicator
(byte)0x00, // no offline PIN required, no mobile support
// 9f02 06 Amount authorized (numeric)
(byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x01, (byte)0x00, // 1.00
// 5f2a 02 Transaction currency code
(byte)0x09, (byte)0x78, // Euro
// 9f1a 02 Terminal country code
(byte)0x00, (byte)0x40, // Austria
(byte)0x00, // Le
};
response = isoDep.transceive(computeCC);