Hi, sorry for this cross posting, I posted it to inferno yesterday but
I'm not getting through (non of my mail is, must work that out)

I've been trying to sign some data with a generated secret using the
attached Limbo. Afaik the secret is ok, it passed checkSK in keyring.c

I got as far as here with the debugging, I don't know how to work out
which function is being called

/usr/local/inferno-os/libinterp/keyring.c:999
         c->signa = (*sa->vec->sign)(b, sk->key);

running :
% sign_test < secret
[$Keyring] Broken: "mpdiv: divide by zero"
sh: 5 "$Keyring":mpdiv: divide by zero

; stack 5
unknown fn() Module $Keyring PC 1445847206
unknown fn() Module ./sign_test.dis PC 42
externalexec() sh.b:919.2, 30