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23afc338f6
This patch adds DROPBEAR_RSAKEY_ARGS and DROPBEAR_DSSKEY_ARGS optional parameters to /etc/default/dropbear. The contents are simply passed to the 'dropbearkey' program when generating a host key. The default keysize for RSA is currently 2048 bits. It takes a CortexA9 running at 700MHz between 4 and 10 seconds to calculate a keypair. The board boots Linux in about a second, but you have to wait for several seconds because of the keypair generation. This patch allows one to put the line DROPBEAR_RSAKEY_ARGS="-s 1024" into /etc/default/dropbear, and have a host key generated in about 0.2 seconds on the same CPU. This is particulary useful for read-only rootfs systems which generate a key on each boot. (From OE-Core rev: c0efbcb47ab37c2d9c298fcd40ecaadd3ca050a7) Signed-off-by: Mike Looijmans <mike.looijmans@topic.nl> Signed-off-by: Ross Burton <ross.burton@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>