+ 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)