TrimetHopFastPass
eli edited this page Oct 25, 2021
·
4 revisions
Trimet Hop Fastpass is smartcard ticketing system in Portland, Oregon. It's a DESFire system containing a single application 0xe010f2 with just 2 files: file 0 and file 1.
In addition to issuing physical cards, the agency also supports HCE in two flavours:
- credit card: This simply uses EMV payment like a regular credit card.
- app payment: This acts as a voucher with Google Pay. It uses Google Pay's pre-paid NFC coupon system.
In bytes, big-endian
| Start | End | Length | Meaning |
|---|---|---|---|
| 0 | 5 | 6 | Constant "TRI1" |
| 6 | 11 | 6 | Constant 00 0d 10 00 00 00. |
| 12 | 15 | 4 | MFG serial number. Engraved on the card as MFG # at the bottom in small |
| 16 | 26 | 11 | Zero-filled |
| 27 | 27 | 1 | Constant 0x0d. Public-key selector? |
| 28 | 95 | 68 | ASN.1 DER-encoded pair of integers. Presumably (EC)DSA signature of first part of this file. Zero-padded |
In bytes, big-endian
| Start | End | Length | Meaning |
|---|---|---|---|
| 0 | 1 | 2 | Constant 0101. Possibly ticket type |
| 2 | 7 | 6 | Zero-filled |
| 8 | 11 | 4 | Issue timestamp. Unix time |
| 12 | 47 | 36 | Zero-filled |