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| -rw-r--r-- | doc/DETAILS | 26 |
1 files changed, 20 insertions, 6 deletions
diff --git a/doc/DETAILS b/doc/DETAILS index 59ccaec62..4286f45c8 100644 --- a/doc/DETAILS +++ b/doc/DETAILS @@ -1125,12 +1125,26 @@ pkd:0:1024:B665B1435F4C2 .... FF26ABB: * GNU extensions to the S2K algorithm - S2K mode 101 is used to identify these extensions. - After the hash algorithm the 3 bytes "GNU" are used to make - clear that these are extensions for GNU, the next bytes gives the - GNU protection mode - 1000. Defined modes are: - - 1001 :: Do not store the secret part at all. - - 1002 :: A stub to access smartcards (not used in 1.2.x) + 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. + * Keyserver helper message format |