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The Tokens area contains a number of entries. Each entry has the following format:

Magic:      0x4e4b4f54 'TOKN'
Version:    0x00000001
Length:     0x???????? Length of the data area
Generation: 0x00000001
CRC:        0x???????? CRC of the full entry treating the 4 CRC bytes as zeroes
Name:       up to 16 bytes, zero padded name of the token
Data:       'lenght' bytes, plus zero padding up to the next 4 bytes boundary

The CRC polynomial is 0xedb88320.

In the webOS-Internals git repository [1] you will find a little utility which reads and sets bootie tokens and env variables as well as restore backup tokens.