CODEWITHSUNDEEP
contactless-smartcardemvtlv
Blackbox First
Blackbox First

Reputation: 67

Parsing EMV 9F10 Token

I received the the following IAD after processing the GPO command, my question then, how is the 9F10 EMV token constructed? Here is the token.

06010A03A020000F04000000000000000000006232E4F9

I am required to send only the CVR portion to the acquiring switch.

Upvotes: 5

Views: 15924

Answers (2)

Nicolas Henneaux
Nicolas Henneaux

Reputation: 12243

From EMV 4.3 Book 3 Common Core Definitions, Application Specification, November 2011, Page 206, C7.2 The CVR has a fixed length of 5 bytes (10 hexadecimals characters) that are the bytes 4-8 included of Issuer Application Data, EMV tag 9F10. The 3 first bytes of 9F10 being the following.

b1 the length
b2 derivation key index
b3 the cryptogram version

EMV book issuer application data

It seems however that the format of this field might vary between schemes.

Upvotes: 6

Adarsh Nanu
Adarsh Nanu

Reputation: 2211

Looking at the cryptogram version I assume this is from a Visa card. The TLV is 9F10 17 06010A03A020000F04000000000000000000006232E4F9 ?

17 is the total length of the data
06 is the length of issuer descretionary data
01 is derivation key index
0A is the cryptogram version (10 in this case ).
03 Length of CVR
A02000 is the CVR here

Upvotes: 5

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