pki: Refactor _RSA_do_sign().
pki: Refactor _RSA_do_sign().

robxu9/libssh,DouglasHeriot/libssh,taikoo/libssh,sebadoom/libssh,mwgoldsmith/libssh,pouete/libssh,jt1/honeypot-libssh,kedazo/libssh,mwgoldsmith/libssh,kedazo/libssh,mwgoldsmith/libssh,kedazo/libssh,elastichosts/libssh,taikoo/libssh,sebadoom/libssh,sebadoom/libssh,Distrotech/libssh,DouglasHeriot/libssh,pouete/libssh,pouete/libssh,nviennot/libssh,wangshawn/libssh,Distrotech/libssh,bigcat26/libssh-mod,wangshawn/libssh,nviennot/libssh,sebadoom/libssh,bigcat26/libssh-mod,Distrotech/libssh,kedazo/libssh,jt1/honeypot-libssh,DouglasHeriot/libssh,wangshawn/libssh,mwgoldsmith/ssh,jt1/honeypot-libssh,mwgoldsmith/libssh,wangshawn/libssh,elastichosts/libssh,taikoo/libssh,DouglasHeriot/libssh,jt1/honeypot-libssh,bigcat26/libssh-mod,mwgoldsmith/ssh,elastichosts/libssh,robxu9/libssh,pouete/libssh,mwgoldsmith/ssh,taikoo/libssh,mwgoldsmith/ssh,nviennot/libssh,Distrotech/libssh,bigcat26/libssh-mod,nviennot/libssh,robxu9/libssh,robxu9/libssh