从CVM列表解析EV的CV规则 [英] Parse CV Rule from CVM List for EMV

问题描述

我已经成功从EMV卡中检索了CVM列表.

I have succesfully retrieved the CVM List from EMV card.

0000 0000 0000 0000 4103 4203 1E03 1F02

从EMV规格书3开始，前4个字节和后4个字节为数量，其余为CV规则.使这些成为CV规则4103 4203 1E03 1F02

From the EMV specification book 3, the first 4 bytes and second 4 bytes are amount and rest is CV rules. Making these the CV Rule 4103 4203 1E03 1F02

这本书还显示了如何解析CV规则，如下所示:

The book also shows how to parse the CV rules, as shown below:

我假设我需要将CV规则中的前两个字节转换为二进制并与上表匹配?但是，为什么上表的单元格为空? 有人还能用简单的伪代码算法解释该问题吗?

I am assuming that I need to convert the first two bytes in a CV rule to binary and match with the table above? But why does the table above have empty cells? Also can someone explain in a simple pseudo code algorithm to parse this?

推荐答案

您是否在同一本书中提到了 10.5.5 CVM处理逻辑部分?它具有详细信息，甚至可以作为流动购物车.

Have you referred section 10.5.5 CVM Processing Logic in the same book ? It has it detailed and even as a flow cart.

关于读为RFU的空位.

As to the empty bits read as RFU.

这是解析样本的方式.

41 03

41 => 0100 0001
Apply succeeding CV Rule if this CVM is unsuccessful
Plaintext PIN verification performed by ICC

03
If terminal supports the CVM
---------------------------------------------------

Similarly, 
42 03

42
Apply succeeding CV Rule if thisCVM is unsuccessful
Enciphered PIN verified online

03
If terminal supports the CVM
----------------------------------------------------

1E03

1E
Signature (paper)

03
If terminal supports the CVM

----------------------------------------------------

1F 02

1F
No CVM required

02
If not unattended cash and not manual cash and not purchase
with cashback

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