This article describe knowledge about SmartTap 2.1.
All resource upload and record here.
Specification
Part 1 describe the detail of SmartTap 2.1 feature.
Part 2 describe the timing requirement. But VP3300 would need longer time than requirement because VP3300 implement software encryption(microECC Library).
SmartTap2.1-Part1-NFCProtocolDRAFT-v0.976.pdf
SmartTap2.0-Part2-TerminalCertificationDRAFT-v0.3.1.pdf
Test App
Before validate VP3300 transaction result, we could use terminal app and merchant app to simulate transaction flow.
Reader(ex. VP3300) should act like terminal app, and VAS app(ex. pass) should act like merchant app. Setup detail could be refer to App Setup Instructions.
[READ ME] App Setup Instructions.docx
Long term private key(LTPK)
How to generate a PEM file
It seem that OpenSSL for Windows could generate PEM file, but I have no idea now.
How to get long term private key from pem file
To get private key from a pem file, you may have some tools to support openssl first, such as OpenSSL for Windows.
When you have tools support openssl, for example, change direction to openssl direction
...
c:\>cd "Program Files (x86)"
c:\Program Files (x86)>cd GnuWin32
c:\Program Files (x86)\GnuWin32>cd bin
c:\Program Files (x86)\GnuWin32\bin>
And using openssl.exe to read pem file(ex. PRIVATE.key_CS1630.pem, from Pronto)
...
c:\Program Files (x86)\GnuWin32\bin>openssl.exe ec -noout -text -in "c:\PRIVATE.key.pem"
read EC key
Private-Key: (256 bit)
priv:
00:f5:36:87:08:93:39:20:55:3b:7b:9f:fb:16:ae:
ed:9c:77:d5:bf:d9:66:2a:f1:49:a6:b9:f9:65:b7:
3f:0c:ca
pub:
04:38:0b:8f:7f:0a:43:33:a7:e4:f2:2a:96:b1:ce:
a8:c3:eb:38:7a:af:d8:36:63:2d:62:dc:c0:a6:61:
9c:cc:28:b4:28:c5:bf:86:38:d7:0e:93:28:c6:b4:
61:39:1e:b2:ef:de:a8:db:bf:fe:93:c1:7d:14:e2:
e6:94:dc:8e:4c
ASN1 OID: prime256v1
And the priv is the string we need.
How to load long term private key to reader
Customer could load LTPK to reader via command C7-62.
Before loading LTPK to reader, we could get private key from PEM file, and we should use RSA 2048 alogrithm to encrypt private key, the step is as below:
RSA Private Key:
...
RSA Public Key:
...
RSA Exp:
...
Long term private key
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Padding “00” + Version(ex. 00 00 00 01) + Long term private key to 256 bytes data
...
Calculate SHA-256 for data
...
Use RSA private key encrypt data
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Add encrypt data and sha-256 data
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IDG Command
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How to configuration reader
There are some configurations need to setup for difference type transaction.
...
Yes,
0x00, 0xBC, 0x61, 0x4E(12345678)
...
Yes
0x05, 0x00, 0x10, 0x00, 0x08, 0x01
...
Stop Payment if smart tap2.1 failed support
...
How to parser NDEF
To understand NDEF please refer to 3.2 Record Layout NFCForum-TS-NDEF-1.pdf and NDEF Parser.
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