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<=========================>
< Format of PwM-KeyCard >
<=========================>
cardformat version: 0x01
The keycard has a small header area and a key-data body.
The header is built with the following scheme:
PWMKEYCARD
[CARDVER]
[CARD-ID]
[KEYDATA-LENGTH]
After this header, the key-data-body with the length
[KEYDATA-LENGTH] follows.
Explanation of the header-fields:
PWMKEYCARD is a magic string at the beginning of the card
to indentify the chipcard as a "pwm-keycard".
[CARDVER] is one byte for holding the card-format version.
[CARD-ID] are 4 bytes (an unsigned BIG-ENDIAN value)
to hold an ID number for the card.
[KEYDATA-LENGTH] are 2 bytes (an unsigned short) for holding
the length of the key-data in BIG-ENDIAN format.
*******************************
* KeyCard backup-image format *
*******************************
backup image version: 0x01
PWMKEYCARD_BACKUPIMAGE
[IMAGEVER]
[CARD-ID]
[KEYDATA]
PWMKEYCARD_BACKUPIMAGE
magic header.
[IMAGEVER]
version indentifier of the backup-image.
[CARD-ID]
card-ID. see keycard-format.
[KEYDATA]
All data after CARD-ID until the end of the file
is treated as the key itself.
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