i found out how to fix this 3des issue
the missing step is very easy
just append after the line
FPrivKey := Pass2Key( TV3KeyType.PrivKey, FPrivPassword );
one more step if the key is smaller than 32
if Length( FPrivKey ) < 32 then
FPrivKey := FPrivKey + Pass2Key( TV3KeyType.PrivKey, FPrivKey );
it is not yet perfect because it must be something like this
while Length( FPrivKey ) < 32 do
...
but for the moment its working for me, i will send the correct version
sson
cheers k1
Am 2016-01-06 20:57, schrieb ung...@its-pro.net:
>> Nice shot, thank you!
>
> you are welcome
>
>> Do you know what ExtendShortKey does?
>
> yes, this is the description from the c# lib
> Extends the encryption key if key size returned by PasswordToKey is
> less then minimum required by the encryption protocol.
>
> and this is with 3des 32
>
> here is the source from the c# lib
>
> public byte[] ExtendShortKey(byte[] shortKey, byte[] password, byte[]
> engineID, IAuthenticationDigest authProtocol)
> {
> int length = shortKey.Length;
> byte[] extendedKey = new byte[MinimumKeyLength];
> Buffer.BlockCopy(shortKey, 0, extendedKey, 0, shortKey.Length);
>
> while (length < MinimumKeyLength)
> {
> byte[] key =
> authProtocol.PasswordToKey(shortKey, engineID);
> int copyBytes = Math.Min(MaximumKeyLength - length,
> authProtocol.DigestLength);
> Buffer.BlockCopy(key, 0, extendedKey, length, copyBytes);
> length += copyBytes;
> }
> return extendedKey;
> }
>
> cheers k1
>
>
>>
>>
>>> hi everybody,
>>>
>>> i found the problem with the 3des encryption
>>> i have comparen the snmpsend source code with the snmpsharpnet source
>>> code
>>> and the problem is in the EncryptPDU
>>> branch
>>>
>>> this line
>>> FPrivKey := Pass2Key( TV3KeyType.PrivKey, FPrivPassword );
>>>
>>> gives the same result as the c# library but in the c# library you can
>>> see, than when the length of the key is smaler than 32 we have to do
>>> another step
>>>
>>> in c# its this lines
>>> if( encryptionKey.Length < MinimumKeyLength )
>>> encryptionKey = ExtendShortKey(encryptionKey, secret, engineId,
>>> authProtocol);
>>>
>>> and this step is missing i think in snmpsend and thats why the
>>> calculated key is wrong
>>>
>>> i will try to imnplement this extra function
>>> if someone wants to try, i can offen an open port to a working 3des
>>> agent, all the free available 3des agents are also not correct
>>> implemented
>>>
>>> thanks
>>> k1
>>>
>>>
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