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From: David Howells <dhowells@redhat.com>
To: Chuck Lever <chuck.lever@oracle.com>
Cc: dhowells@redhat.com, CIFS <linux-cifs@vger.kernel.org>,
	Linux NFS Mailing List <linux-nfs@vger.kernel.org>,
	Herbert Xu <herbert@gondor.apana.org.au>,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
	Trond Myklebust <trond.myklebust@hammerspace.com>,
	Bruce Fields <bfields@fieldses.org>,
	linux-crypto@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	linux-afs@lists.infradead.org
Subject: Re: [RFC][PATCH 00/18] crypto: Add generic Kerberos library
Date: Thu, 12 Nov 2020 15:42:56 +0000	[thread overview]
Message-ID: <2380561.1605195776@warthog.procyon.org.uk> (raw)
In-Reply-To: <2F96670A-58DC-43A6-A20E-696803F0BFBA@oracle.com>

Chuck Lever <chuck.lever@oracle.com> wrote:

> > There are three main interfaces to it:
> > 
> > (*) I/O crypto: encrypt, decrypt, get_mic and verify_mic.
> > 
> >     These all do in-place crypto, using an sglist to define the buffer
> >     with the data in it.  Is it necessary to make it able to take separate
> >     input and output buffers?
> 
> Hi David, Wondering if these "I/O" APIs use synchronous or async
> crypto under the covers. For small data items like MICs, synchronous
> might be a better choice, especially if asynchronous crypto could
> result in incoming requests getting re-ordered and falling out of
> the GSS sequence number window.
> 
> What say ye?

For the moment I'm using synchronous APIs as that's what sunrpc is using (I
borrowed the basic code from there).

It would be interesting to consider using async, but there's a potential
issue.  For the simplified profile, encryption and integrity checksum
generation can be done simultaneously, but decryption and verification can't.
For the AES-2 profile, the reverse is true.

For my purposes in rxrpc, async mode isn't actually that useful since I'm only
doing the contents of a UDP packet at a time.  Either I'm encrypting with the
intention of immediate transmission or decrypting with the intention of
immediately using the data, so I'm in a context where I can wait anyway.

What might get me more of a boost would be to encrypt the app data directly
into a UDP packet and decrypt the UDP packet directly into the app buffers.
This is easier said than done, though, as there's typically security metadata
inserted into the packet inside the encrypted region.

David


  parent reply	other threads:[~2020-11-12 15:43 UTC|newest]

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-12 12:57 [RFC][PATCH 00/18] crypto: Add generic Kerberos library David Howells
2020-11-12 12:57 ` [PATCH 01/18] crypto/krb5: Implement Kerberos crypto core David Howells
2020-11-12 12:58 ` [PATCH 02/18] crypto/krb5: Add some constants out of sunrpc headers David Howells
2020-11-12 12:58 ` [PATCH 03/18] crypto/krb5: Provide infrastructure and key derivation David Howells
2020-11-12 12:58 ` [PATCH 04/18] crypto/krb5: Implement the Kerberos5 rfc3961 " David Howells
2020-11-12 12:58 ` [PATCH 05/18] crypto/krb5: Implement the Kerberos5 rfc3961 encrypt and decrypt functions David Howells
2020-11-12 12:58 ` [PATCH 06/18] crypto/krb5: Implement the Kerberos5 rfc3961 get_mic and verify_mic David Howells
2020-11-12 12:58 ` [PATCH 07/18] crypto/krb5: Implement the AES enctypes from rfc3962 David Howells
2020-11-12 12:58 ` [PATCH 08/18] crypto/krb5: Implement crypto self-testing David Howells
2020-11-12 12:58 ` [PATCH 09/18] crypto/krb5: Implement the AES enctypes from rfc8009 David Howells
2020-11-12 12:59 ` [PATCH 10/18] crypto/krb5: Implement the AES encrypt/decrypt " David Howells
2020-11-12 12:59 ` [PATCH 11/18] crypto/krb5: Add the AES self-testing data " David Howells
2020-11-12 12:59 ` [PATCH 12/18] crypto/krb5: Implement the Camellia enctypes from rfc6803 David Howells
2020-11-12 12:59 ` [PATCH 13/18] rxrpc: Add the security index for yfs-rxgk David Howells
2020-11-12 12:59 ` [PATCH 14/18] rxrpc: Add YFS RxGK (GSSAPI) security class David Howells
2020-11-12 12:59 ` [PATCH 15/18] rxrpc: rxgk: Provide infrastructure and key derivation David Howells
2020-11-12 12:59 ` [PATCH 16/18] rxrpc: rxgk: Implement the yfs-rxgk security class (GSSAPI) David Howells
2020-11-12 13:00 ` [PATCH 17/18] rxrpc: rxgk: Implement connection rekeying David Howells
2020-11-12 13:00 ` [PATCH 18/18] rxgk: Support OpenAFS's rxgk implementation David Howells
2020-11-12 13:44 ` [RFC][PATCH 00/18] crypto: Add generic Kerberos library David Howells
2020-11-12 14:36 ` Chuck Lever
2020-11-12 15:42 ` David Howells [this message]
2020-11-12 15:49   ` Chuck Lever
2020-11-12 16:54   ` David Howells
2020-11-12 21:07     ` Bruce Fields
2020-11-12 21:09       ` Chuck Lever
2020-11-12 18:37 ` J. Bruce Fields
2020-11-12 18:39   ` Chuck Lever
2020-11-26  6:33 ` Herbert Xu
2020-11-26  8:19 ` David Howells
2020-11-27  5:07   ` Herbert Xu
2020-12-01  8:44   ` David Howells
2020-12-01  8:46     ` Herbert Xu
2020-12-01  9:12     ` David Howells
2020-12-01 10:36       ` Herbert Xu
2020-12-04 14:59 ` Why the auxiliary cipher in gss_krb5_crypto.c? David Howells
2020-12-04 15:46   ` Bruce Fields
2020-12-04 16:05     ` Chuck Lever
2020-12-04 16:14     ` Bruce Fields
2020-12-04 16:01   ` David Howells
2020-12-04 16:03     ` Bruce Fields
2020-12-04 16:50     ` David Howells
2020-12-04 17:06       ` Ard Biesheuvel
2020-12-04 17:19       ` David Howells
2020-12-04 17:35         ` Ard Biesheuvel
2020-12-04 21:08           ` Herbert Xu
2020-12-07  8:24           ` David Howells
2020-12-07 12:01         ` David Howells
2020-12-07 13:08           ` Ard Biesheuvel
2020-12-07 14:15           ` David Howells
2020-12-08  8:27             ` Ard Biesheuvel
2020-12-08  9:18             ` David Howells
2020-12-04 18:13   ` Theodore Y. Ts'o
2020-12-08 13:25 ` David Howells
2020-12-08 14:04   ` Ard Biesheuvel
2020-12-08 14:13   ` David Howells
2020-12-08 14:02 ` David Howells

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