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BN_DEBUG (was Re: On head of 1.0.1 branch, ecdsatest crashes if openssl is built to be FIPS capable)
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Andy Polyakov  
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 More options Nov 9 2012, 10:16 am
Newsgroups: mailing.openssl.dev
From: ap...@openssl.org (Andy Polyakov)
Date: Fri, 09 Nov 2012 16:19:52 +0100
Local: Fri, Nov 9 2012 10:19 am
Subject: Re: BN_DEBUG (was Re: On head of 1.0.1 branch, ecdsatest crashes if openssl is built to be FIPS capable)
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>> When I build with "./Configure debug-linux-x86_64" then the tests all
>> pass. When I build with "./Configure debug-linux-x86_64 fips
>> --with-fipsdir=..." then all tests pass up to ecdsatest:

>> prime239v2: ........ ok
>> prime239v3: ........ ok
>> prime256v1: ........ ok
>> sect163k1: ........ ok
>> sect163r1: ........ ok
>> sect163r2: ........ ok
>> ecdsatest: bn_lib.c:243: BN_clear_free: Assertion `(_bnum2->top == 0) || (_bnum2->d[_bnum2->top - 1] != 0)' failed.
>> sect193r1: make[1]: *** [test_ecdsa] Aborted

> Is it just that BN_DEBUG has significant false positives, and I
> shouldn't really be defining it?

As FIPS module is compiled without BN_DEBUG it can and certainly will
confuse code compiled with BN_DEBUG that will call it. This surely is
the explanation for the phenomena and the answer to specific question is
no, you shouldn't define it.

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