SNMP sha/aes decryption

[Magnus Fröberg]

Hi

found an issue while doing snmpwalk with SNMP version 3, SHA as 
authproto and
AES as privproto.
The SNMP agent didn't manage to decrypt the get request.
Fix for R10B-8:

Index: snmpa_usm.erl
===================================================================
RCS file: /home/share/erlang/cvsroot/otp/lib/snmp/src/agent/snmpa_usm.erl,v
retrieving revision 1.3
diff -u -r1.3 snmpa_usm.erl
--- snmpa_usm.erl       12 Nov 2005 22:50:05 -0000      1.3
+++ snmpa_usm.erl       25 Nov 2005 13:54:40 -0000
@@ -268,19 +268,19 @@
            Data
     end.

-do_decrypt(Data, UsmUser,
-          #usmSecurityParameters{msgPrivacyParameters = PrivParms}) ->
-           EncryptedPDU = snmp_pdus:dec_scoped_pdu_data(Data),
-           SecName      = element(?usmUserSecurityName, UsmUser),
-           PrivP        = element(?usmUserPrivProtocol, UsmUser),
-           PrivKey      = element(?usmUserPrivKey,      UsmUser),
-    try_decrypt(PrivP, PrivKey, PrivParms, EncryptedPDU, SecName).
+do_decrypt(Data, UsmUser, UsmSecParams) ->
+    EncryptedPDU = snmp_pdus:dec_scoped_pdu_data(Data),
+    SecName      = element(?usmUserSecurityName, UsmUser),
+    PrivP        = element(?usmUserPrivProtocol, UsmUser),
+    PrivKey      = element(?usmUserPrivKey,      UsmUser),
+    try_decrypt(PrivP, PrivKey, UsmSecParams, EncryptedPDU, SecName).

 try_decrypt(?usmNoPrivProtocol, _, _, _, SecName) -> % 3.2.5
     error(usmStatsUnsupportedSecLevels,
          ?usmStatsUnsupportedSecLevels_instance, SecName); % OTP-5464
 try_decrypt(?usmDESPrivProtocol,
-           PrivKey, MsgPrivParams, EncryptedPDU, SecName) ->
+           PrivKey, UsmSecParams, EncryptedPDU, SecName) ->
+    #usmSecurityParameters{msgPrivacyParameters = MsgPrivParams} = 
UsmSecParams,
     case (catch des_decrypt(PrivKey, MsgPrivParams, EncryptedPDU)) of
        {ok, DecryptedData} ->
            DecryptedData;

/Magnus