Re: [Ethereal-users] 0.99 ESP protocol preferences

[Guy Harris <guy@xxxxxxxxxxxx>]

On Jun 12, 2006, at 2:09 PM, Chris Flory wrote:

> Ok, I see a problem, it appears I am limited to what I can use as an
> encryption/algorithm option.

At least according to the comments in packet-ipsec.c, your choices are:

	NULL
	TripleDES-CBC [RFC2451] : keylen 192 bits.
	AES-CBC with 128-bit keys [RFC3602] : keylen 128 and 192/256 bits.
	AES-CTR [RFC3686] : keylen 160/224/288 bits. The remaining 32 bits  
will be used as nonce.
	DES-CBC [RFC2405] : keylen 64 bits
	BLOWFISH-CBC : keylen 128 bits.
	TWOFISH-CBC : keylen 128/256 bits.

(that's just cut-and-pasted from the comment).

> I am using ESP/MD5/HMAC-128 for my authenticaton,

For authentication, the comment says:

	NULL
	HMAC-SHA1-96 [RFC2404] : any keylen
	HMAC-MD5-96 [RFC2403] : any keylen
	HMAC-SHA256 : any keylen

and says that AES-XCBC-MAC-96 [RFC3566] is "Not available because no  
implementation found."

> and 3DES-168 for encryption on IPSec.

The only 3DES I see in the first list is 3DES-CBC with a 192-bit key  
length; is 168 the key length you're using?