Re: AES_XCBC?

[Andrew Cagney]

 Because Variety is the spice of life

On 7 December 2017 at 23:41, f masood via dev-tech-crypto
 wrote:
> can you elaborate why you're focusing on NSS not OPENSSL for this task ?
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Re: AES_XCBC?

[f masood via dev-tech-crypto]

can you elaborate why you're focusing on NSS not OPENSSL for this task ?
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Re: AES_XCBC?

[Paul Wouters]

On Wed, 6 Dec 2017, f masood via dev-tech-crypto wrote:


On Wednesday, December 6, 2017 at 7:51:13 PM UTC+5, Andrew Cagney wrote:

I'm looking at implementing AES_XCBC using NSS.  That is:

AES-XCBC-MAC-96: https://tools.ietf.org/html/rfc3566#section-4
AES-XCBC-MAC-PRF: https://tools.ietf.org/html/rfc4434

(the latter adds a recursive rule for building a fixed size key from a
variable key)

reading NSS's "documentation", I've turned up AES_MAC, but I'm
guessing that that is just implementing the primitive
https://en.wikipedia.org/wiki/CBC-MAC using AES.

Is there anything else, or will I be needing to implement things by
wrapping this primitive? (and if so, was there a test I could look at
for the existing code?)

Andrew


What version of NSS are you targeting ?


Libreswan can handle something not being available in some versions of
NSS. If it is not supported, we'd like the support to be added to a new
version of NSS.


I dont think that currently NSS has support of this XCBC, so you'll have to do 
changes and then compile ?


It's fine for libreswan to not support it if support is missing in NSS.


Whats your scenario? I mean are you going to use this cihersuite for ipsec 
application ?


It will be used as IKE algorithm. IPsec (ESP) crypto is handled by the
kernel.

Paul
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Re: AES_XCBC?

[f masood via dev-tech-crypto]

On Wednesday, December 6, 2017 at 7:51:13 PM UTC+5, Andrew Cagney wrote:
> I'm looking at implementing AES_XCBC using NSS.  That is:
> 
> AES-XCBC-MAC-96: https://tools.ietf.org/html/rfc3566#section-4
> AES-XCBC-MAC-PRF: https://tools.ietf.org/html/rfc4434
> 
> (the latter adds a recursive rule for building a fixed size key from a
> variable key)
> 
> reading NSS's "documentation", I've turned up AES_MAC, but I'm
> guessing that that is just implementing the primitive
> https://en.wikipedia.org/wiki/CBC-MAC using AES.
> 
> Is there anything else, or will I be needing to implement things by
> wrapping this primitive? (and if so, was there a test I could look at
> for the existing code?)
> 
> Andrew

What version of NSS are you targeting ?
I dont think that currently NSS has support of this XCBC, so you'll have to do 
changes and then compile ?
Whats your scenario? I mean are you going to use this cihersuite for ipsec 
application ? 
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AES_XCBC?

[Andrew Cagney]

I'm looking at implementing AES_XCBC using NSS.  That is:

AES-XCBC-MAC-96: https://tools.ietf.org/html/rfc3566#section-4
AES-XCBC-MAC-PRF: https://tools.ietf.org/html/rfc4434

(the latter adds a recursive rule for building a fixed size key from a
variable key)

reading NSS's "documentation", I've turned up AES_MAC, but I'm
guessing that that is just implementing the primitive
https://en.wikipedia.org/wiki/CBC-MAC using AES.

Is there anything else, or will I be needing to implement things by
wrapping this primitive? (and if so, was there a test I could look at
for the existing code?)

Andrew
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