问:(DO)我需要将CV规则中的前两个字节转换为二进制并与上面的表匹配吗?
答:例如标签0x8E值中,您有:
问:但是为什么上面的表格有空单元格?
答:因为在标签值之前有8个HEX字符,即两个每个4字节长的金额。然后是CVM规则列表。
问题:能否有人用简单的伪代码算法解析一下这个问题?
回答:可以参考解析CVM List标签0x8E的值的示例。
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# Cheef's parser.
# Copyright (C) 2008-2017 Alexander Shevelev. https://iso8583.info/
# lib : "/lib/EMV/" - Integrated Circuit Card Specifications for Payment Systems
# tool : "TV"
# stat : 18 nodes, 4 lookup tables, 100.00% passed (4/4)
TV:#"8E0000000000000000410342031E031F02" # EMV, Cardholder Verification Method (CVM) List
- tag: "8E"
- val:#"0000000000000000410342031E031F02" # Cardholder Verification Method (CVM) List.
- AmountX: "00000000" # Amount X
- AmountY: "00000000" # Amount Y
- CVRs:#"34313033343230333145303331463032" # CVM List
- S1:#"4103" # Cardholder Verification Rule
- CVMCode: "41" # Cardholder Verification Method (CVM) Code
# _1______ - Apply succeeding CVR if CVM fails
# __000001 - ICC Plain PIN verification
- CVMCondition: "03" # Cardholder Verification Method (CVM) Condition Code // If terminal supports the CVM
- S2:#"4203" # Cardholder Verification Rule
- CVMCode: "42" # Cardholder Verification Method (CVM) Code
# _1______ - Apply succeeding CVR if CVM fails
# __000010 - Online Enciphered PIN verification
- CVMCondition: "03" # Cardholder Verification Method (CVM) Condition Code // If terminal supports the CVM
- S3:#"1E03" # Cardholder Verification Rule
- CVMCode: "1E" # Cardholder Verification Method (CVM) Code
# _0______ - Fail cardholder verification if CVM is unsuccessful
# __011110 - Signature (paper)
- CVMCondition: "03" # Cardholder Verification Method (CVM) Condition Code // If terminal supports the CVM
- S4:#"1F02" # Cardholder Verification Rule
- CVMCode: "1F" # Cardholder Verification Method (CVM) Code
# _0______ - Fail cardholder verification if CVM is unsuccessful
# __011111 - No CVM required
- CVMCondition: "02" # Cardholder Verification Method (CVM) Condition Code // If not cash or cashback