[openssl-users] DH_generate_key Hangs

[Jason Qian]

We call DH_generate_key(DH *dh) and the RAND_poll() is called
ssleay_rand_bytes


  libeay32d.dll!RAND_poll()  Line 572 C
  libeay32d.dll!ssleay_rand_bytes(unsigned char * buf=0x03318fe0, int
num=128, int pseudo=0)  Line 395 C
  libeay32d.dll!ssleay_rand_nopseudo_bytes(unsigned char * buf=0x03318fe0,
int num=128)  Line 536 + 0xf bytes C
  libeay32d.dll!RAND_bytes(unsigned char * buf=0x03318fe0, int num=128)
Line 164 + 0x10 bytes C
  libeay32d.dll!bnrand(int pseudorand=0, bignum_st * rnd=0x03318518, int
bits=1023, int top=0, int bottom=0)  Line 152 + 0xd bytes C
> libeay32d.dll!BN_rand(bignum_st * rnd=0x03318518, int bits=1023, int
top=0, int bottom=0)  Line 213 + 0x17 bytes C
  libeay32d.dll!generate_key(dh_st * dh=0x03316a88)  Line 170 + 0x11 bytes C
  libeay32d.dll!DH_generate_key(dh_st * dh=0x03316a88)  Line 84 + 0xf bytes
C

Thanks
Jason

On Thu, Oct 5, 2017 at 3:33 PM, Jeffrey Walton <noloader at gmail.com> wrote:

> On Thu, Oct 5, 2017 at 2:55 PM, Jason Qian via openssl-users
> <openssl-users at openssl.org> wrote:
> > Thanks Michael,
> >
> >       I saw a lot of discussion for this issue on,
> >
> >        https://mta.openssl.org/pipermail/openssl-dev/2015-
> July/002210.html
> >
> >       Not sure if openSSL has a workaround or a patch ?
> >
> >
> > It hangs on :
> >
> > libeay32.dll!RAND_poll() Line 523
> >
> > if (heap_first(&hentry,
> >       hlist.th32ProcessID,
> >                       hlist.th32HeapID))
>
> You should avoid calls to RAND_poll altogether on Windows. Do so by
> explicitly seeding the random number generator yourself.
>
> Also see https://wiki.openssl.org/index.php/Random_Numbers#Windows_Issues
> on the OpenSSL wiki.
>
> Jeff
>
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