-/*
-On my Linux system, all variants of BN_mod_exp appear to work here,
-but a SIGSEGV occurs later:
-
-Program received signal SIGSEGV, Segmentation fault.
-0x40066e59 in ()
-(gdb) bt
-#0 0x40066e59 in ()
-#1 0x40066d3e in ()
-#2 0x805e64a in CRYPTO_free (str=0x807d968) at mem.c:248
-#3 0x804f68f in bn_expand2 (b=0x807d6b4, words=10) at bn_lib.c:438
-#4 0x8055366 in BN_lshift (r=0x807d6b4, a=0x807d68c, n=63) at bn_shift.c:132
-#5 0x804ca7a in BN_div (dv=0x0, rm=0x807d68c, num=0x807d68c,
- divisor=0x807d678, ctx=0x807d610) at bn_div.c:205
-#6 0x805391a in BN_nnmod (r=0x807d68c, m=0x807d68c, d=0x807d678,
- ctx=0x807d610) at bn_mod.c:132
-#7 0x8056198 in BN_kronecker (a=0x807d664, b=0x807d848, ctx=0x807d610)
- at bn_kron.c:170
-#8 0x805d351 in BN_mod_sqrt (in=0x807d860, a=0x807d830, p=0x807d848,
- ctx=0x807d610) at bn_sqrt.c:165
-#9 0x804b365 in test_sqrt (bp=0x807d7e8, ctx=0x807d610) at bntest.c:1057
-#10 0x8048da8 in main (argc=0, argv=0xbffffbb8) at bntest.c:240
-#11 0x4002f78a in ()
-
-These symptoms indicate that the error probably happens earlier
-in the program. I've disabled the calls to all earlier test_...
-functions and replaced BN_generate_prime by BN_set_word(.., 65537)
-in bntest.c, but this does not help.
- */
-