GNU-divert-to-card S2K format

[Werner Koch]

On Wed, 25 Feb 2015 10:49, peter at digitalbrains.com said:

> something. It should be:
>
> S2K specifier 110

Well, it is 101.  I just updated doc/DETAILS>  It now reads:

* GNU extensions to the S2K algorithm

  1 octet  - S2K Usage: either 254 or 255.
  1 octet  - S2K Cipher Algo: 0
  1 octet  - S2K Specifier: 101
  3 octets - "GNU"
  1 octet  - GNU S2K Extension Number.

  If such a GNU extension is used neither an IV nor any kind of
  checksum is used.  The defined GNU S2K Extension Numbers are:

  - 1 :: Do not store the secret part at all.  No specific data
         follows.

  - 2 :: A stub to access smartcards.  This data follows:
         - One octet with the length of the following serial number.
         - The serial number. Regardless of what the length octet
           indicates no more than 16 octets are stored.

  Note that gpg stores the GNU S2K Extension Number internally as an
  S2K Specifier with an offset of 1000.



Shalom-Salam,

   Werner


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