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Diffstat (limited to 'doc/DETAILS')
| -rw-r--r-- | doc/DETAILS | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/doc/DETAILS b/doc/DETAILS index ad7c60942..c00914bb7 100644 --- a/doc/DETAILS +++ b/doc/DETAILS @@ -432,6 +432,32 @@ more arguments in future versions. 0x04 = this attribute packet is expired +Format of the "--attribute-fd" output +===================================== + +When --attribute-fd is set, during key listings (--list-keys, +--list-secret-keys) GnuPG dumps each attribute packet to the file +descriptor specified. --attribute-fd is intended for use with +--status-fd as part of the required information is carried on the +ATTRIBUTE status tag (see above). + +The contents of the attribute data is specified by 2440bis, but for +convenience, here is the Photo ID format, as it is currently the only +attribute defined: + + Byte 0-1: The length of the image header. Due to a historical + accident (i.e. oops!) back in the NAI PGP days, this is + a little-endian number. Currently 16 (0x10 0x00). + + Byte 2: The image header version. Currently 0x01. + + Byte 3: Encoding format. 0x01 == JPEG. + + Byte 4-15: Reserved, and currently unused. + + All other data after this header is raw image (JPEG) data. + + Key generation ============== Key generation shows progress by printing different characters to |