Hi Matt, It was a key generated with an old version of ssh-keygen, and then converted to dropbear format. The public key length shows 1024 bits with ssh-keygen -l
When I use this private key with dropbear it issued the warning that the key was < MIN_RSA_KEYLEN In dropbear the keylen was reported by function mp_count_bits as 1023 I worked around it by adapting the MIN_RSA_KEYLEN to 1023 and did a recompile.. It is not problematic... Hans On Thu, Oct 29, 2020 at 1:21 PM Matt Johnston <m...@ucc.asn.au> wrote: > > Hi Hans, > > Sorry I missed replying to this message a while ago. > > What program created the key? As far as I can tell the test > is correct, the top bit might be unset? > > Cheers, > Matt > > On Thu, Aug 27, 2020 at 07:36:26AM +0200, Hans Harder wrote: > > HI, > > > > I noticed that I got warnings that the RSA key was too short. > > Further investigation showed that I was using a 1024 bits RSA key but > > the mp_count_bits function return 1023 count (probably 0 based) > > > > in rsa.c it states: if (mp_count_bits(key->n) < MIN_RSA_KEYLEN) > > > > Is this intentional or should I just define the MIN_RSA_KEYLEN as > > 1023 instead of the 1024 now in sysoptions.h > > > > Hans
