Subject: Re: no RSA with openssl on m68k systems with 1.5_ALPHA2?
To: Thorsten Frueauf <email@example.com>
From: None <firstname.lastname@example.org>
Date: 10/04/2000 10:16:03
>>Is it possilbe that rsa support only works if "pseudo-device rnd" is
>>compiled in the kernel?
>>At least I have it in my kernel on i386 and sparc where sshd works and don't
>>have it in the kernel for amiga and hp300 (its not activated in GENERIC there
>>either...). I will recompile a kernel with rnd and see if that fixes the
>>sshd daemon, but its already late and it will take some time on m68k, so
>>don't expect feedback that soon :)
> i'll try using a kernel without RND device and see if your issue
> repeats. please hold.
hmm I see.
- ssh/rsa.c:rsa_alive() calls RSA_generate_key()
- RSA_generate_key() calls BN_generate_prime()
- BN_generate_prime() calls BN_rand() via probable_prime()
- BN_rand require us to have kernel random number device
so openssh considers that we don't have RSA in the library.
similarly, DH_generate_key() does not work if there's no random number
I'm not sure if it is safe to allow userland-generated pseudo random
number. it looks intentional. all I can do with confidence is to
improve error message from ssh/sshd, to warn that you don't have random