BN_FLG_CONSTTIME is a ridiculous API and easy to mess up
(CVE-2016-2178). Instead, code that needs a particular algorithm which
preserves secrecy of some arguemnt should call into that algorithm
directly.
This is never set outside the library and is finally unused within the
library! Credit for all this goes almost entirely to Brian Smith. I just
took care of the last bits.
Note there was one BN_FLG_CONSTTIME check that was still reachable, the
BN_mod_inverse in RSA key generation. However, it used the same code in
both cases for even moduli and φ(n) is even if n is not a power of two.
Traditionally, RSA keys are not powers of two, even though it would make
the modular reductions a lot easier.
When reviewing, check that I didn't remove a BN_FLG_CONSTTIME that led
to a BN_mod_exp(_mont) or BN_mod_inverse call (with the exception of the
RSA one mentioned above). They should all go to functions for the
algorithms themselves like BN_mod_exp_mont_consttime.
This CL shows the checks are a no-op for all our tests:
https://boringssl-review.googlesource.com/c/12927/
BUG=125
Change-Id: I19cbb375cc75aac202bd76b51ca098841d84f337
Reviewed-on: https://boringssl-review.googlesource.com/12926
Reviewed-by: Adam Langley <alangley@gmail.com>
Towards an eventual goal of opaquifying BoringSSL structs, we want
our consumers -- in this case, Android's libcore -- to not directly
manipulate BigNums; and it would be convenient for them if we would
perform the appropriate gymnastics to interpret little-endian byte
streams.
It also seems a priori a bit strange to have only big-endian varieties
of BN byte-conversions.
This CL provides little-endian equivalents of BN_bn2bin_padded
and BN_bin2bn.
BUG=97
Change-Id: I0e92483286def86d9bd71a46d6a967a3be50f80b
Reviewed-on: https://boringssl-review.googlesource.com/12641
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
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Instead, use BN_mod_exp_mont_consttime of p - 2. This removes two more
call sites sensitive to BN_FLG_CONSTTIME. We're down to just that last
BN_mod_inverse modulo φ(n). (Sort of. It's actually not sensitive
because even mod inverses always hit the other codepath. Perhaps we
should just leave it alone.)
Note this comes with a slight behavior change. The BN_MONT_CTXs are
initialized a little earlier. If a caller calls RSA_generate_* and then
reaches into the struct to scrap all the fields on it, they'll get
confused. Before, they had to perform an operation on it to get
confused. This is a completely ridiculous thing to do.
Since we do this a lot, this introduces some convenience functions for
doing the Fermat's Little Theorem mod inverse and fixes a leak in the
DSA code should computing kinv hit a malloc error.
BUG=125
Change-Id: Iafcae2fc6fd379d161f015c90ff7050e2282e905
Reviewed-on: https://boringssl-review.googlesource.com/12925
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: Adam Langley <agl@google.com>
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BUG=97
Change-Id: I4799cc99511e73af44def1d4daa36a8b4699f62d
Reviewed-on: https://boringssl-review.googlesource.com/12904
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
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Most C standard library functions are undefined if passed NULL, even
when the corresponding length is zero. This gives them (and, in turn,
all functions which call them) surprising behavior on empty arrays.
Some compilers will miscompile code due to this rule. See also
https://www.imperialviolet.org/2016/06/26/nonnull.html
Add OPENSSL_memcpy, etc., wrappers which avoid this problem.
BUG=23
Change-Id: I95f42b23e92945af0e681264fffaf578e7f8465e
Reviewed-on: https://boringssl-review.googlesource.com/12928
Commit-Queue: David Benjamin <davidben@google.com>
Reviewed-by: Adam Langley <agl@google.com>
Simplify the code, and in particular make |BN_div|, |BN_mod|, and
|BN_nnmod| insensitive to |BN_FLG_CONSTTIME|. This improves the
effectiveness of testing by reducing the number of branches that are
likely to go untested or less tested.
There is no performance-sensitive code that uses BN_div but doesn't
already use BN_FLG_CONSTTIME except RSA signature verification and
EC_GROUP creation. RSA signature verification, ECDH, and ECDSA
performance aren't significantly different with this change.
Change-Id: Ie34c4ce925b939150529400cc60e1f414c7676cd
Reviewed-on: https://boringssl-review.googlesource.com/9105
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
Get one step closer to removing the dependency on |BN_div| from most
programs. Also get one step closer to a constant-time implementation of
|BN_MONT_CTX_set|; we now "just" need to create a constant-time variant
of |BN_mod_lshift1_quick|.
Note that this version might actually increase the side channel signal,
since the variance in timing in |BN_div| is probably less than the variance
from the many conditional reductions in the new method.
On one Windows x64 machine, the speed of RSA verification using the new
version is not too different from the speed of the old code. However,
|BN_div| is generally slow on Windows x64 so I expect this isn't faster
on all platforms. Regardless, we generally consider ECDSA/EdDSA
signature verification performance to be adaquate and RSA signature
verification is much, much faster even with this change.
For RSA signing the performance is not a significant factor since
performance-sensitive applications will cache the |RSA| structure and
the |RSA| structure will cache the Montgomery contexts.
Change-Id: Ib14f1a35c99b8da435e190342657f6a839381a1a
Reviewed-on: https://boringssl-review.googlesource.com/10520
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This gives a 15-16% perf boost for 1024-bit RSA keys, but 1024-bit RSA
keys are no longer important enough for this code to carry its weight.
Change-Id: Ia9f0e7fec512c28e90754ababade394c1f11984d
Reviewed-on: https://boringssl-review.googlesource.com/12841
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These are regression tests for
https://boringssl-review.googlesource.com/c/12525/ that target the
RSAZ-512 code rather than the disabled RSAZ-1024 code.
These were created by extracting p and dmp1 from
ssl/test/rsa_1024_key.pem and creating similar test vectors as with the
AVX2 test vectors. They currently fail, but pass if the RSAZ-512 code is
disabled.
Change-Id: I99dd3f385941ddbb1cc64b5351f4411081b42dd7
Reviewed-on: https://boringssl-review.googlesource.com/12840
Commit-Queue: David Benjamin <davidben@google.com>
Reviewed-by: Adam Langley <agl@google.com>
Note that this adds new non-constant-time code into the RSAZ-based
code path.
Change-Id: Ibca3bc523ede131b55c70ac5066c0014df1f5a70
Reviewed-on: https://boringssl-review.googlesource.com/12525
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The input base, |a|, isn't reduced mod |m| in the RSAZ case so
incorrect results are given for out-of-range |a| when the RSAZ
implementation is used. On the other hand, the RSAZ implementation is
more correct as far as constant-time operation w.r.t. |a| is concerned.
Change-Id: Iec4d0195cc303ce442ce687a4b7ea42fb19cfd06
Reviewed-on: https://boringssl-review.googlesource.com/12524
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
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The error value is -2, but at this point ret has already been set to
some running answer and must be reset to -2.
(This is unreachable. BN_rshift only fails on caller or malloc error,
and it doesn't need to malloc when running in-place.)
Change-Id: I33930da84b00d1906bdee9d09b9504ea8121fac4
Reviewed-on: https://boringssl-review.googlesource.com/12681
Commit-Queue: David Benjamin <davidben@google.com>
Reviewed-by: Adam Langley <agl@google.com>
Change-Id: I3350ff0e4ffe7495a83211b89c675a0125fb2f06
Reviewed-on: https://boringssl-review.googlesource.com/12465
Commit-Queue: David Benjamin <davidben@google.com>
Reviewed-by: Adam Langley <agl@google.com>
Zero only has one allowed square root, not two.
Change-Id: I1dbd2137a7011d2f327b271b267099771e5499c3
Reviewed-on: https://boringssl-review.googlesource.com/12461
Commit-Queue: David Benjamin <davidben@google.com>
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(Imported from upstream's 2a7dd548a6f5d6f7f84a89c98323b70a2822406e and
9ebcbbba81eba52282df9ad8902f047e2d501f51.)
This is only in the ADX assembly codepath which we do not enable. See
$addx = 0 at the top of the file. Nonetheless, import the test vector
and fix since we still have the code in there.
Upstream's test vector only compares a*b against b*a. The expected
answer was computed using Python.
Change-Id: I3a21093978c5946d83f2d6f4f8399f69d78202cf
Reviewed-on: https://boringssl-review.googlesource.com/12186
Commit-Queue: David Benjamin <davidben@google.com>
Reviewed-by: Adam Langley <agl@google.com>
I missed these in the last round.
Change-Id: I9b47216eef87c662728e454670e9e516de71ca21
Reviewed-on: https://boringssl-review.googlesource.com/11740
Commit-Queue: David Benjamin <davidben@google.com>
Reviewed-by: Adam Langley <agl@google.com>
Change-Id: I51e5a7dac3ceffc41d3a7a57157a11258e65bc42
Reviewed-on: https://boringssl-review.googlesource.com/11721
Commit-Queue: David Benjamin <davidben@google.com>
Reviewed-by: Adam Langley <agl@google.com>
Macros need a healthy dose of parentheses to avoid expression-level
misparses. Most of this comes from the clang-tidy CL here:
https://android-review.googlesource.com/c/235696/
Also switch most of the macros to use do { ... } while (0) to avoid all
the excessive comma operators and statement-level misparses.
Change-Id: I4c2ee51e347d2aa8c74a2d82de63838b03bbb0f9
Reviewed-on: https://boringssl-review.googlesource.com/11660
Commit-Queue: David Benjamin <davidben@google.com>
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Change-Id: Ia020ea08431859bf268d828b5d72715295de26e6
Reviewed-on: https://boringssl-review.googlesource.com/11401
Commit-Queue: David Benjamin <davidben@google.com>
Reviewed-by: Adam Langley <agl@google.com>
C99 decided that, like PRI* macros, UINT64_C and friends should be
conditioned on __STDC_CONSTANT_MACROS in C++. C++11 then decided this
was ridiculous and overruled this decision. However, Android's headers
in older NDKs mistakenly followed the C99 rules for C++, so work around
this.
This fixes the android_arm bots.
Change-Id: I3b49e8dfc20190ebfa78876909bd0dccd3e210ea
Reviewed-on: https://boringssl-review.googlesource.com/11089
Reviewed-by: David Benjamin <davidben@google.com>
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Android currently implements this manually (see NativeBN_putULongInt) by
reaching into BIGNUM's internals. BN_ULONG is a somewhat unfortunate API
anyway as the size is platform-dependent, so add a platform-independent
way to do this.
The other things Android needs are going to need more work, but this
one's easy.
BUG=97
Change-Id: I4af4dc29f9845bdce0f0663c379b4b5d3e1dc46e
Reviewed-on: https://boringssl-review.googlesource.com/11088
Commit-Queue: David Benjamin <davidben@google.com>
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This was done just by grepping for 'size_t i;' and 'size_t j;'. I left
everything in crypto/x509 and friends alone.
There's some instances in gcm.c that are non-trivial and pulled into a
separate CL for ease of review.
Change-Id: I6515804e3097f7e90855f1e7610868ee87117223
Reviewed-on: https://boringssl-review.googlesource.com/10801
Reviewed-by: Adam Langley <agl@google.com>
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(Imported from upstream's 2a20b6d9731488bcb500e58a434375f59fb9adcc)
Change-Id: If3db4dac3d4cd675cf7854c4e154823d25d00eb9
Reviewed-on: https://boringssl-review.googlesource.com/10921
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Unlike the Scoped* types, bssl::UniquePtr is available to C++ users, and
offered for a large variety of types. The 'extern "C++"' trick is used
to make the C++ bits digestible to C callers that wrap header files in
'extern "C"'.
Change-Id: Ifbca4c2997d6628e33028c7d7620c72aff0f862e
Reviewed-on: https://boringssl-review.googlesource.com/10521
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
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958aaf1ea1, imported from upstream, had an
off-by-one error. Reproducing the failure is fairly easy as it can't
even serialize 1. See also upstream's
099e2968ed3c7d256cda048995626664082b1b30.
Rewrite the function completely with CBB and add a basic test.
BUG=chromium:639740
Change-Id: I41a91514c4bb9e83854824ed5258ffe4e49d9491
Reviewed-on: https://boringssl-review.googlesource.com/10540
Commit-Queue: David Benjamin <davidben@google.com>
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Change-Id: Ie60744761f5aa434a71a998f5ca98a8f8b1c25d5
Reviewed-on: https://boringssl-review.googlesource.com/10447
Reviewed-by: David Benjamin <davidben@google.com>
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I found an earlier reference for an algorithm for the optimized
computation of n0 that is very similar to the one in the "Montgomery
Multiplication" paper cited in the comments. Add a reference to it.
Henry S. Warren, Jr. pointed out that his "Montgomery Multiplication"
paper is not a chapter of his book, but a supplement to the book.
Correct the reference to it.
Change-Id: Iadeb148c61ce646d1262ccba0207a31ebdad63e9
Reviewed-on: https://boringssl-review.googlesource.com/10480
Reviewed-by: Adam Langley <agl@google.com>
This was causing some Android breakage. The real bug is actually
entirely in Android for getting its error-handling code wrong and not
handling multiple errors. I'll fix that. (See b/30917411.)
That said, BN_R_NO_INVERSE is a perfectly legitimate reason for those
operations to fail, so ERR_R_INTERNAL_ERROR isn't really a right thing
to push in front anyway. We're usually happy enough with single-error
returns (I'm still a little skeptical of this queue idea), so let's just
leave it at that.
Change-Id: I469b6e2b5987c6baec343e2cfa52bdcb6dc42879
Reviewed-on: https://boringssl-review.googlesource.com/10483
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If an oversize BIGNUM is presented to BN_bn2dec() it can cause
BN_div_word() to fail and not reduce the value of 't' resulting
in OOB writes to the bn_data buffer and eventually crashing.
Fix by checking return value of BN_div_word() and checking writes
don't overflow buffer.
Thanks to Shi Lei for reporting this bug.
CVE-2016-2182
(Imported from upstream's e36f27ddb80a48e579783bc29fb3758988342b71.)
Change-Id: Ib9078921b4460952c4aa5a6b03ec39a03704bb90
Reviewed-on: https://boringssl-review.googlesource.com/10367
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Commit-Queue: David Benjamin <davidben@google.com>
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Reviewed-by: Adam Langley <agl@google.com>
This more accurately reflects the documented contract for
|BN_mod_inverse_odd|.
Change-Id: Iae98dabe3943231859eaa5e798d06ebe0231b9f1
Reviewed-on: https://boringssl-review.googlesource.com/9160
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Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
This eliminates duplicate logic.
Change-Id: I283273ae152f3644df4384558ee4a021f8c2d454
Reviewed-on: https://boringssl-review.googlesource.com/9104
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BN_mod_inverse_odd was always being used on 64-bit platforms and was being used
for all curves with an order of 450 bits or smaller (basically, everything but
P-521). We generally don't care much about minor differences in the speed of
verifying signatures using curves other than P-256 and P-384. It is better to
always use the same algorithm.
This also allows |bn_mod_inverse_general|, |bn_mod_inverse_no_branch|, and
|BN_mod_inverse| to be dropped from programs that can somehow avoid linking in
the RSA key generation and RSA CRT recovery code.
Change-Id: I79b94bff23d2b07d5e0c704f7d44538797f8c7a0
Reviewed-on: https://boringssl-review.googlesource.com/9103
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The main RSA public modulus size of concern is 2048 bits.
bn_mod_inverse_odd is already used for public moduli of 2048 bits and
smaller on 64-bit platforms, so for 64-bit it is a no-op. For 32-bit
x86, this seems to slightly decrease the speed of RSA signing, but not
by a lot, and plus we don't care about RSA signing performance much on
32-bit platforms. It's better to have all platforms using the same
algorithms.
Change-Id: I869dbfc98994e36a04a535c1fe63b14a902a4f13
Reviewed-on: https://boringssl-review.googlesource.com/9102
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This is a step towards exposing |bn_mod_inverse_odd| for use outside
of crypto/bn/gcd.c.
Change-Id: I2968f1e43306c03775b3573a022edd92f4e91df2
Reviewed-on: https://boringssl-review.googlesource.com/9101
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This is in preparation for factoring out the binary Euclidean
implementation (the one used for odd numbers that aren't too big) for
direct use from outside of crypto/bn/gcd.c. The goal is to make the
resultant |BN_mod_inverse_odd|'s signature similar to
|BN_mod_inverse_blinded|. Thus, the logic for reducing the final result
isn't factored out because that yet-to-be-created |BN_mod_inverse_odd|
will need to do it itself.
Change-Id: Iaecb79fb17d13c774c4fb6ade8742937780b0006
Reviewed-on: https://boringssl-review.googlesource.com/9100
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|BN_mod_exp_mont| uses |BN_nnmod| so it seems like
|BN_mod_exp_mont_consttime| should too. Further, I created
these test vectors by doing the math by hand, and the tests
passed for |BN_mod_exp_mont| but failed for
|BN_mod_exp_mont_consttime| without this change.
Change-Id: I7cffa1375e94dd8eaee87ada78285cd67fff1bac
Reviewed-on: https://boringssl-review.googlesource.com/9032
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Have |bn_correct_top| fix |bn->neg| if the input is zero so that we
don't have negative zeros lying around.
Thanks to Brian Smith for noticing.
Change-Id: I91bcadebc8e353bb29c81c4367e85853886c8e4e
Reviewed-on: https://boringssl-review.googlesource.com/9074
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Negative zeros are nuts, but it will probably be a while before we've
fixed everything that can create them. Fix both to consistently print
'-0' rather than '0' so failures are easier to diagnose (BN_cmp believes
the values are different.)
Change-Id: Ic38d90601b43f66219d8f44ca085432106cf98e3
Reviewed-on: https://boringssl-review.googlesource.com/9073
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Simplify the calculation of the Montgomery constants in
|BN_MONT_CTX_set|, making the inversion constant-time. It should also
be faster by avoiding any use of the |BIGNUM| API in favor of using
only 64-bit arithmetic.
Now it's obvious how it works. /s
Change-Id: I59a1e1c3631f426fbeabd0c752e0de44bcb5fd75
Reviewed-on: https://boringssl-review.googlesource.com/9031
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We managed to mix two comment styles in the Go license headers and
copy-and-paste it throughout the project.
Change-Id: Iec1611002a795368b478e1cae0b53127782210b1
Reviewed-on: https://boringssl-review.googlesource.com/9060
Reviewed-by: Steven Valdez <svaldez@google.com>
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
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Yo dawg I herd you like blinding so I put inversion blinding in your
RSA blinding so you can randomly mask your random mask.
This improves upon the current situation where we pretend that
|BN_mod_inverse_no_branch| is constant-time, and it avoids the need to
exert a lot of effort to make a actually-constant-time modular
inversion function just for RSA blinding.
Note that if the random number generator weren't working correctly then
the blinding of the inversion wouldn't be very effective, but in that
case the RSA blinding itself would probably be completely busted, so
we're not really losing anything by relying on blinding to blind the
blinding.
Change-Id: I771100f0ad8ed3c24e80dd859ec22463ef2a194f
Reviewed-on: https://boringssl-review.googlesource.com/8923
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This also adds a missing OPENSSL_EXPORT.
Change-Id: I6c2400246280f68f51157e959438644976b1171b
Reviewed-on: https://boringssl-review.googlesource.com/9041
Reviewed-by: Adam Langley <agl@google.com>
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
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There are many cases where we need |BN_rand_range| but with a minimum
value other than 0. |BN_rand_range_ex| provides that.
Change-Id: I564326c9206bf4e20a37414bdbce16a951c148ce
Reviewed-on: https://boringssl-review.googlesource.com/8921
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
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Zero is only a valid input to or output of |BN_mod_inverse| when the
modulus is one. |BN_MONT_CTX_set| actually depends on this, so test
that this works.
Change-Id: Ic18f1fe786f668394951d4309020c6ead95e5e28
Reviewed-on: https://boringssl-review.googlesource.com/8922
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: Adam Langley <agl@google.com>
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Some gerrit git hook says this is necessary.
Change-Id: I8a7a0a0e6732688c965b43824fe54b2db79a4919
Reviewed-on: https://boringssl-review.googlesource.com/8990
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
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