[SNMP4J] Strange behavior about "SNMP users Table" in wireshark 1.0.3

[raocheng]

In wireshark, when I use "Edit --> Preferences --> Protocols --> SNMP -->
Users Table" to add a SNMP user and fill in the following information:
engine_id: 800000a103131313210019
userName: admin_131313210019
auth_model: SHA1
authPassword:
\x96\xbc\x97\x65\x2b\xce\x31\x1a\xb6\xca\x13\xed\x46\x6b\x52\x69\x99\xf2\x23\xde
priv_proto: AES
privPassword:
\x2b\xce\x31\x1a\xb6\xca\x13\xed\x46\x6b\x52\x69\x99\xf2\x23\xde

After I press "OK" button and then return to view its value, the
authPassword/privPassword have been changed to the following values:
 authPassword: \x96\xbc\x97e+\xce1\x1a\xb6\xca\x13\xedFkRi\x99\xf2#\xde
privPassword: +\xce1\x1a\xb6\xca\x13\xedFkRi\x99\xf2#\xde

And of couse I can not get the decrpted SNMPV3 messages.

What's the problem? Is this a bug ?

Thanks in advance

Cheng