Horton

Re: storing an explicit nonce

Bruce Momjian <bruce@momjian.us>

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From: Bruce Momjian <bruce@momjian.us>
To: Stephen Frost <sfrost@snowman.net>
Cc: Andres Freund <andres@anarazel.de>, Robert Haas <robertmhaas@gmail.com>, Alvaro Herrera <alvherre@alvh.no-ip.org>, Masahiko Sawada <sawada.mshk@gmail.com>, Tom Kincaid <tomjohnkincaid@gmail.com>, Amit Kapila <amit.kapila16@gmail.com>, Thomas Munro <thomas.munro@gmail.com>, PostgreSQL Development <pgsql-hackers@postgresql.org>, Masahiko Sawada <masahiko.sawada@2ndquadrant.com>
Date: 2021-05-27T21:00:23Z
Lists: pgsql-hackers

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. Rethink method for assigning OIDs to the template0 and postgres DBs.

  2. pg_upgrade: Preserve database OIDs.

  3. pg_upgrade: Preserve relfilenodes and tablespace OIDs.

  4. Fix for new Boolean node

  5. Improve error handling of HMAC computations

  6. Add macro RelationIsPermanent() to report relation permanence

  7. Enhance nbtree index tuple deletion.

On Thu, May 27, 2021 at 04:09:13PM -0400, Stephen Frost wrote:
> The above article, at least, suggested encrypting the sector number
> using the second key and then multiplying that times 2^(block number),
> where those blocks were actually AES 128bit blocks.  The article further
> claims that this is what's used in things like Bitlocker, TrueCrypt,
> VeraCrypt and OpenSSL.
> 
> While the documentation isn't super clear, I'm taking that to mean that
> when you actually use EVP_aes_128_xts() in OpenSSL, and you provide it
> with a 256-bit key (twice the size of the AES key length function), and
> you give it a 'tweak', that what you would actually be passing in would
> be the "sector number" in the above method, or for us perhaps it would
> be relfilenode+block number, or maybe just block number but it seems
> like it'd be better to include the relfilenode to me.

If you go in that direction, you should make sure pg_upgrade preserves
what you use (it does not preserve relfilenode, just pg_class.oid), and
CREATE DATABASE still works with a simple file copy.

-- 
  Bruce Momjian  <bruce@momjian.us>        https://momjian.us
  EDB                                      https://enterprisedb.com

  If only the physical world exists, free will is an illusion.