Article from the serie "CCID descriptor statistics"
The dwMaxCCIDMessageLength field is a number value from the CCID USB descriptor:
The standard value for dwMaxCCIDMessageLength is 271.
On the 271 bytes :
In the PC_to_RDR_XfrBlock CCID CCID command we note:
CCID Readers with dwMaxCCIDMessageLength < 271 and that are Short APDU level exchange readers are suspect. They are:
So only the IIT E.Key Almaz-1C reader is bogus and limited to a maximum of 249 bytes of data in an APDU.
The dwMaxCCIDMessageLength field is a number value from the CCID USB descriptor:
For extended APDU level the value shall be between 261 + 10 (header) and 65544 +10, otherwise the minimum value is the wMaxPacketSize of the Bulk-OUT endpoint.
| dwMaxCCIDMessageLength | # | % |
|---|---|---|
| 271 bytes | 184 | 72.44 % |
| 1034 bytes | 9 | 3.54 % |
| 263 bytes | 9 | 3.54 % |
| 512 bytes | 9 | 3.54 % |
| 261 bytes | 7 | 2.76 % |
| 272 bytes | 6 | 2.36 % |
| 270 bytes | 5 | 1.97 % |
| 1400 bytes | 2 | 0.79 % |
| 273 bytes | 2 | 0.79 % |
| 278 bytes | 2 | 0.79 % |
| 432 bytes | 2 | 0.79 % |
| 65550 bytes | 2 | 0.79 % |
| 1014 bytes | 1 | 0.39 % |
| 1024 bytes | 1 | 0.39 % |
| 1041 bytes | 1 | 0.39 % |
| 138 bytes | 1 | 0.39 % |
| 2048 bytes | 1 | 0.39 % |
| 2100 bytes | 1 | 0.39 % |
| 256 bytes | 1 | 0.39 % |
| 262 bytes | 1 | 0.39 % |
| 266 bytes | 1 | 0.39 % |
| 280 bytes | 1 | 0.39 % |
| 288 bytes | 1 | 0.39 % |
| 522 bytes | 1 | 0.39 % |
| 536 bytes | 1 | 0.39 % |
| 586 bytes | 1 | 0.39 % |
| 64 bytes | 1 | 0.39 % |
The standard value for dwMaxCCIDMessageLength is 271.
On the 271 bytes :
- 10 bytes are used for the CCID header
- 4 bytes are used for the CLA, INS, P1, P2 APDU header
- 1 byte for the data size
- 256 bytes for the data
In the PC_to_RDR_XfrBlock CCID CCID command we note:
The block should never exceed the dwMaxCCIDMessageLength-10 in the Class Descriptor.The value dwMaxCCIDMessageLength is related to dwMaxIFSD. See also "CCID descriptor statistics: dwMaxIFSD".
CCID Readers with dwMaxCCIDMessageLength < 271 and that are Short APDU level exchange readers are suspect. They are:
- Aktiv Co., ProgramPark Rutoken Magistra: 261 bytes and ICCD Version B
- Gemalto PDT: 261 bytes and ICCD Version B
- IIT E.Key Almaz-1C: 264 bytes
- OCS ID-One Cosmo Card USB Smart Chip Device: 261 bytes and ICCD Version B
- Philips Semiconductors JCOP41V221: 261 bytes and ICCD Version B
- Philips Semiconductors SmartMX Sample: 261 bytes and ICCD Version B
So only the IIT E.Key Almaz-1C reader is bogus and limited to a maximum of 249 bytes of data in an APDU.
This is dummy text. It is not meant to be read. Accordingly, it is difficult to figure out when to end it. But then, this is dummy text. It is not meant to be read. Period.
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