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Test environment
=============
kernel 2.6.5
ipw2100 driver 0.51
Fedora core 1
Presario X1000 Compaq laptop

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Test procedure and result
===================

If execute "iwconfig eth1 key <KEY5> [5]",the driver will replace the current 
active key value with KEY5,Although KEY5 should be an invalid key.
steps:
1,configure a key[x],while the x<=4
  %iwconfig eth1 key 2222222222 [2]
  %iwconfig eth1 key [2]
  %iwconfig
  .......
  Encryption key:2222-2222-22 [2] Security mode:restricted
  .......
2,set the KEY5
  %iwconfig eth1 key 5555555555 [5]
  %iwconfig eth1 key [5]
  %iwconfig
  .........
  Encryption key:5555-5555-55 [2] Security mode:restricted
  .........
from the result,we can see that the active key [2]'s value has been changed 
into KEY5,although we think that key [5] should be treated as an invalid key.