The standard computation model for constant-time code is that memory
access patterns must be independent of secret data.
BN_mod_exp_mont_consttime was previously written to a slightly weaker
model: only cacheline access patterns must be independent of secret
data. It assumed accesses within a cacheline were indistinguishable.
The CacheBleed attack (https://eprint.iacr.org/2016/224.pdf) showed this
assumption was false. Cache lines may be divided into cache banks, and
the researchers were able to measure cache bank contention pre-Haswell.
For Haswell, the researchers note "But, as Haswell does show timing
variations that depend on low address bits [19], it may be vulnerable to
similar attacks."
OpenSSL's fix to CacheBleed was not to adopt the standard constant-time
computation model. Rather, it now assumes accesses within a 16-byte
cache bank are indistinguishable, at least in the C copy_from_prebuf
path. These weaker models failed before with CacheBleed, so avoiding
such assumptions seems prudent. (The [19] citation above notes a false
dependence between memory addresses with a distance of 4k, which may be
what the paper was referring to.) Moreover, the C path is largely unused
on x86_64 (which uses mont5 asm), so it is especially questionable for
the generic C code to make assumptions based on x86_64.
Just walk the entire table in the C implementation. Doing so as-is comes
with a performance hit, but the striped memory layout is, at that point,
useless. We regain the performance loss (and then some) by using a more
natural layout. Benchmarks below.
This CL does not touch the mont5 assembly; I haven't figured out what
it's doing yet.
Pixel 3, aarch64:
Before:
Did 3146 RSA 2048 signing operations in 10009070us (314.3 ops/sec)
Did 447 RSA 4096 signing operations in 10026666us (44.6 ops/sec)
After:
Did 3210 RSA 2048 signing operations in 10010712us (320.7 ops/sec)
Did 456 RSA 4096 signing operations in 10063543us (45.3 ops/sec)
Pixel 3, armv7:
Before:
Did 2688 RSA 2048 signing operations in 10002266us (268.7 ops/sec)
Did 459 RSA 4096 signing operations in 10004785us (45.9 ops/sec)
After:
Did 2709 RSA 2048 signing operations in 10001299us (270.9 ops/sec)
Did 459 RSA 4096 signing operations in 10063737us (45.6 ops/sec)
x86_64 Broadwell, mont5 assembly disabled:
(This configuration is not actually shipped anywhere, but seemed a
useful data point.)
Before:
Did 14274 RSA 2048 signing operations in 10009130us (1426.1 ops/sec)
Did 2448 RSA 4096 signing operations in 10046921us (243.7 ops/sec)
After:
Did 14706 RSA 2048 signing operations in 10037908us (1465.0 ops/sec)
Did 2538 RSA 4096 signing operations in 10059986us (252.3 ops/sec)
Change-Id: If41da911d4281433856a86c6c8eadf99cd33e2d8
Reviewed-on: https://boringssl-review.googlesource.com/c/33268
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
It's a table of BN_ULONGs. No particular need to use unsigned char.
Change-Id: I397883cef9f39fb162c2b0bfbd6a70fe399757a2
Reviewed-on: https://boringssl-review.googlesource.com/c/33267
Commit-Queue: Adam Langley <agl@google.com>
Reviewed-by: Adam Langley <agl@google.com>
Make it more obvious something is happening.
Change-Id: Ie68d1e96a9bedd4b572c1cc99910348f89f07624
Reviewed-on: https://boringssl-review.googlesource.com/c/33244
Commit-Queue: Adam Langley <agl@google.com>
Reviewed-by: Adam Langley <agl@google.com>
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We can actually use modules now.
Change-Id: I0bd8abaf4e3318069f93fa17e89b4804d03944eb
Reviewed-on: https://boringssl-review.googlesource.com/c/33205
Commit-Queue: David Benjamin <davidben@google.com>
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Bug: chromium:347402
Change-Id: I1442b595ed7296b9d9fe88357565f68e1ab80ffd
Reviewed-on: https://boringssl-review.googlesource.com/c/32644
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
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We test all Intel variants via SDE. For ARM, we can do the next best
thing and tweak with OPENSSL_armcap_P. If the host CPU does not support
the instructions we wish to test, skip it, but print something so we
know whether we need a more featureful test device.
Also fix the "CRASHED" status to "CRASH", to match
https://chromium.googlesource.com/chromium/src/+/master/docs/testing/json_test_results_format.md
(It's unclear if anything actually parses that JSON very carefully...)
Bug: 19
Change-Id: I811cc00a0d210a454287ac79c06f18fbc54f96dd
Reviewed-on: https://boringssl-review.googlesource.com/c/33204
Commit-Queue: David Benjamin <davidben@google.com>
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Contraction was always and only done immediately prior to calling
|p224_felem_to_generic| so merge it into that function.
Change-Id: If4fb46c6305ba724dfff15e8362a094c599f3f2c
Reviewed-on: https://boringssl-review.googlesource.com/c/33165
Commit-Queue: Adam Langley <agl@google.com>
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Reviewed-by: David Benjamin <davidben@google.com>
cfd50c63 switched to using the add/dbl of p224_64.c, but the outputs
weren't contracted before being returned and could be out of range,
giving invalid results.
Change-Id: I3cc295c7ddbff43375770dbafe73b37a668e4e6b
Reviewed-on: https://boringssl-review.googlesource.com/c/33184
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: Adam Langley <agl@google.com>
C99 added macros such as PRIu64 to inttypes.h, but it said to exclude them from
C++ unless __STDC_FORMAT_MACROS or __STDC_CONSTANT_MACROS was defined. This
text was never incorporated into any C++ standard and explicitly overruled in
C++11.
Some libc headers followed C99. Notably, glibc prior to 2.18
(https://sourceware.org/bugzilla/show_bug.cgi?id=15366) and old versions of the
Android NDK.
In the NDK, although it was fixed some time ago (API level 20), the NDK used to
use separate headers per API level. Only applications using minSdkVersion >= 20
would get the fix. Starting NDK r14, "unified" headers are available which,
among other things, make the fix available (opt-in) independent of
minSdkVersion. In r15, unified headers are opt-out, and in r16 they are
mandatory.
Try removing these and see if anyone notices. The former is past our five year
watermark. The latter is not and Android has hit
https://boringssl-review.googlesource.com/c/boringssl/+/32686 before, but
unless it is really widespread, it's probably simpler to ask consumers to
define __STDC_CONSTANT_MACROS and __STDC_FORMAT_MACROS globally.
Update-Note: If you see compile failures relating to PRIu64, UINT64_MAX, and
friends, update your glibc or NDK. As a short-term fix, add
__STDC_CONSTANT_MACROS and __STDC_FORMAT_MACROS to your build, but get in touch
so we have a sense of how widespread it is.
Bug: 198
Change-Id: I56cca5f9acdff803de1748254bc45096e4c959c2
Reviewed-on: https://boringssl-review.googlesource.com/c/33146
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: Adam Langley <agl@google.com>
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The change seems to have stuck, so bring us closer to C/++11 static asserts.
(If we later find we need to support worse toolchains, we can always use
__LINE__ or __COUNTER__ to avoid duplicate typedef names and just punt on
embedding the message into the type name.)
Change-Id: I0e5bb1106405066f07740728e19ebe13cae3e0ee
Reviewed-on: https://boringssl-review.googlesource.com/c/33145
Commit-Queue: Adam Langley <agl@google.com>
Reviewed-by: Adam Langley <agl@google.com>
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Chromium has now switched to building our assembly with NASM
(https://crbug.com/766721), which is more maintained. Next step
is to switch remaining folks (Conscrypt, not sure if there's anyone
else) and we'll drop Yasm.
Change-Id: If4f45399b48d0d7477afb47647e83e7250bf854f
Reviewed-on: https://boringssl-review.googlesource.com/c/33144
Reviewed-by: Adam Langley <agl@google.com>
The function does not take ownership of |e| and this makes that clear.
Change-Id: I53bb5fa94bec5d16d1c904b59391d36df7abbde6
Reviewed-on: https://boringssl-review.googlesource.com/c/33164
Commit-Queue: Adam Langley <agl@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
Reviewed-by: David Benjamin <davidben@google.com>
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With the allocations and BN_CTX gone, ECDH and point2oct are much, much
shorter.
Bug: 242
Change-Id: I3421822e94100f7eb2f5f2373df7fb3b3311365e
Reviewed-on: https://boringssl-review.googlesource.com/c/33071
Commit-Queue: David Benjamin <davidben@google.com>
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(Otherwise the individual-file build breaks.)
Change-Id: Id3defd08cd2b49af1d8eb6890bd8454332c1aa1e
Reviewed-on: https://boringssl-review.googlesource.com/c/33124
Commit-Queue: Adam Langley <agl@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
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These are used for field elements too.
Change-Id: I74e3dbcafdce34ad507f64a0718e0420b56b51ae
Reviewed-on: https://boringssl-review.googlesource.com/c/33070
Commit-Queue: David Benjamin <davidben@google.com>
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Now the only allocations in ECDSA are the ECDSA_SIG input and output.
Change-Id: If1fcde6dc2ee2c53f5adc16a7f692e22e9c238de
Reviewed-on: https://boringssl-review.googlesource.com/c/33069
Commit-Queue: David Benjamin <davidben@google.com>
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For simplicity, punt order > field or width mismatches. Analogous
optimizations are possible, but the generic path works fine and no
commonly-used curve looks hits those cases.
Before:
Did 5888 ECDSA P-384 verify operations in 3094535us (1902.7 ops/sec)
After [+6.7%]:
Did 6107 ECDSA P-384 verify operations in 3007515us (2030.6 ops/sec)
Also we can fill in p - order generically and avoid extra copies of some
constants.
Change-Id: I38e1b6d51b28ed4f8cb74697b00a4f0fbc5efc3c
Reviewed-on: https://boringssl-review.googlesource.com/c/33068
Commit-Queue: David Benjamin <davidben@google.com>
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The Clang used in the Android SDK, at least, defines both __ARM_NEON__
and __ARM_NEON for ARMv7, but only the latter for AArch64.
This change switches each use of __ARM_NEON__ to accept either.
Change-Id: I3b5d5badc9ff0210888fd456e9329dc53a2b9b09
Reviewed-on: https://boringssl-review.googlesource.com/c/33104
Commit-Queue: Adam Langley <alangley@gmail.com>
Commit-Queue: David Benjamin <davidben@google.com>
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This removes the failure cases for cmp_x_coordinate, this clearing our
earlier dilemma.
Change-Id: I057f705e49b0fb5c3fc9616ee8962a3024097b24
Reviewed-on: https://boringssl-review.googlesource.com/c/33065
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
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This is in preparation for removing the BIGNUM from cmp_x_coordinate.
Change-Id: Id8394248e3019a4897c238289f039f436a13679d
Reviewed-on: https://boringssl-review.googlesource.com/c/33064
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
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I forgot to refresh the public key in those tests, so they weren't
actually testing what they were supposed to. With this fix, injecting
too larger of a P_MINUS_ORDER into p256-x86_64.c now breaks tests.
Change-Id: I5d10a85c84b09629448beef67c86de607525fc71
Reviewed-on: https://boringssl-review.googlesource.com/c/33044
Reviewed-by: Adam Langley <agl@google.com>
Reportedly some combination of C++ modules and old clang gets upset.
That seems an inadvisable combination, but including headers under
extern "C" is rude, so fix it.
Change-Id: I12f873e1be41697b67f2b1145387a3c6fc769c28
Reviewed-on: https://boringssl-review.googlesource.com/c/33024
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
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Having to lazily create it is a little wordy, and we append to it in
three places now. V2ClientHello makes this slightly finicky, but I think
this is still clearer.
Change-Id: If931db0b56efd7f0728c0b7d119886864dd7933a
Reviewed-on: https://boringssl-review.googlesource.com/c/32824
Commit-Queue: Steven Valdez <svaldez@google.com>
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Reviewed-by: Steven Valdez <svaldez@google.com>
This function is not EC_METHOD-specific, nor is there any reason it
would be (we do not support GF2m).
Change-Id: I4896cd16a107ad6a99be445a0dc0896293e8c8f9
Reviewed-on: https://boringssl-review.googlesource.com/c/32884
Commit-Queue: David Benjamin <davidben@google.com>
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This is done in preparation of generalizing the optimization to all our
EC_METHODs.
Wycheproof happily does cover the case where x needed a reduction, but
they don't appear to check x being just above or below n, only x = p - 1
(adjusted downwards). Also we can tailor the test vectors a bit to the
x == r*z^2 (mod p) strategy to make sure we don't mess that up.
Additionally, the scenario is different for n > p. There is also the
nuisance of EC_FELEM vs EC_SCALAR having different widths. All our
built-in curves are well-behaved (same width, and consistently p < n),
but secp160r1 is reachable from custom curves and violates both
properties. Generate some tests to cover it as well.
Change-Id: Iefa5ebfe689a81870be21f04f5962ab161d38dab
Reviewed-on: https://boringssl-review.googlesource.com/c/32985
Commit-Queue: David Benjamin <davidben@google.com>
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Some of the ec files now reference ECDSA_R_BAD_SIGNATURE. Instead, lift the
error-pushing to ecdsa.c.
Change-Id: Ice3e7a22c5099756599df0ab0b215c0752ada4ee
Reviewed-on: https://boringssl-review.googlesource.com/c/32984
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: Adam Langley <agl@google.com>
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This reverts commit e907ed4c4b. CPUID
checks have been added so hopefully this time sticks.
Change-Id: I5e0e5b87427c1230132681f936b3c70bac8263b8
Reviewed-on: https://boringssl-review.googlesource.com/c/32924
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Update-Note: This effectively reverts https://boringssl-review.googlesource.com/4733,
which was an attempt at a well-defined story during renegotiation and pre-handshake.
This is a behavior change, though one that matches OpenSSL upstream. It is also more
consistent with other functions, such as SSL_get_curve_id. Renegotiation is now
opt-in, so this is less critical, and, if we change the behavior mid-renegotiation,
we should do it consistently to all getters.
Change-Id: Ica6b386fb7c5ac524395de6650642edd27cac36f
Reviewed-on: https://boringssl-review.googlesource.com/c/32904
Reviewed-by: David Benjamin <davidben@google.com>
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Now that the tuned add/dbl implementations are exposed, these can be
specific to EC_GFp_mont_method and call the felem_mul and felem_sqr
implementations directly.
felem_sqr and felem_mul are still used elsewhere in simple.c, however,
so we cannot get rid of them yet.
Change-Id: I5ea22a8815279931afc98a6fc578bc85e3f8bdcc
Reviewed-on: https://boringssl-review.googlesource.com/c/32849
Commit-Queue: David Benjamin <davidben@google.com>
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Change-Id: I7922b4b26dabb6875e800472ee8453ca4a9922e0
Reviewed-on: https://boringssl-review.googlesource.com/c/32845
Reviewed-by: David Benjamin <davidben@google.com>
Reviewed-by: Adam Langley <agl@google.com>
A split SSL handshake may involve 2 binaries, potentially built at
different versions: call them the "handoff/handback" binary and the
"handshake" binary. We would like to guarantee that the
handoff/handback binary does not make any promises that the handshake
binary cannot keep.
d2ed382 serialized |kCiphers|; this commit extends the same approach
to |kNamedGroups|.
Change-Id: Idb13e54e9b189236309f6054a36872c5a4d96985
Reviewed-on: https://boringssl-review.googlesource.com/c/32825
Reviewed-by: David Benjamin <davidben@google.com>
This reverts commit 3d450d2844. It fails
SDE, looks like a missing CPUID check before using vector instructions.
Change-Id: I6b7dd71d9e5b1f509d2e018bd8be38c973476b4e
Reviewed-on: https://boringssl-review.googlesource.com/c/32864
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: Adam Langley <agl@google.com>
Some consumer stumbled upon EC_POINT_{add,dbl} being faster with a
"custom" P-224 curve than the built-in one and made "custom" clones to
work around this. Before the EC_FELEM refactor, EC_GFp_nistp224_method
used BN_mod_mul for all reductions in fallback point arithmetic (we
primarily support the multiplication functions and keep the low-level
point arithmetic for legacy reasons) which took quite a performance hit.
EC_FELEM fixed this, but standalone felem_{mul,sqr} calls out of
nistp224 perform a lot of reductions, rather than batching them up as
that implementation is intended. So it is still slightly faster to use a
"custom" curve.
Custom curves are the last thing we want to encourage, so just route the
tuned implementations out of EC_METHOD to close this gap. Now the
built-in implementation is always solidly faster than (or identical to)
the custom clone. This also reduces the number of places where we mix
up tuned vs. generic implementation, which gets us closer to making
EC_POINT's representation EC_METHOD-specific.
Change-Id: I843e1101a6208eaabb56d29d342e886e523c78b4
Reviewed-on: https://boringssl-review.googlesource.com/c/32848
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This commit improves the performance of ECDSA signature verification
(over NIST P-256 curve) for x86 platforms. The speedup is by a factor of 1.15x.
It does so by:
1) Leveraging the fact that the verification does not need
to run in constant time. To this end, we implemented:
a) the function ecp_nistz256_points_mul_public in a similar way to
the current ecp_nistz256_points_mul function by removing its constant
time features.
b) the Binary Extended Euclidean Algorithm (BEEU) in x86 assembly to
replace the current modular inverse function used for the inversion.
2) The last step in the ECDSA_verify function compares the (x) affine
coordinate with the signature (r) value. Converting x from the Jacobian's
representation to the affine coordinate requires to perform one inversions
(x_affine = x * z^(-2)). We save this inversion and speed up the computations
by instead bringing r to x (r_jacobian = r*z^2) which is faster.
The measured results are:
Before (on a Kaby Lake desktop with gcc-5):
Did 26000 ECDSA P-224 signing operations in 1002372us (25938.5 ops/sec)
Did 11000 ECDSA P-224 verify operations in 1043821us (10538.2 ops/sec)
Did 55000 ECDSA P-256 signing operations in 1017560us (54050.9 ops/sec)
Did 17000 ECDSA P-256 verify operations in 1051280us (16170.8 ops/sec)
After (on a Kaby Lake desktop with gcc-5):
Did 27000 ECDSA P-224 signing operations in 1011287us (26698.7 ops/sec)
Did 11640 ECDSA P-224 verify operations in 1076698us (10810.8 ops/sec)
Did 55000 ECDSA P-256 signing operations in 1016880us (54087.0 ops/sec)
Did 20000 ECDSA P-256 verify operations in 1038736us (19254.2 ops/sec)
Before (on a Skylake server platform with gcc-5):
Did 25000 ECDSA P-224 signing operations in 1021651us (24470.2 ops/sec)
Did 10373 ECDSA P-224 verify operations in 1046563us (9911.5 ops/sec)
Did 50000 ECDSA P-256 signing operations in 1002774us (49861.7 ops/sec)
Did 15000 ECDSA P-256 verify operations in 1006471us (14903.6 ops/sec)
After (on a Skylake server platform with gcc-5):
Did 25000 ECDSA P-224 signing operations in 1020958us (24486.8 ops/sec)
Did 10373 ECDSA P-224 verify operations in 1046359us (9913.4 ops/sec)
Did 50000 ECDSA P-256 signing operations in 1003996us (49801.0 ops/sec)
Did 18000 ECDSA P-256 verify operations in 1021604us (17619.4 ops/sec)
Developers and authors:
***************************************************************************
Nir Drucker (1,2), Shay Gueron (1,2)
(1) Amazon Web Services Inc.
(2) University of Haifa, Israel
***************************************************************************
Change-Id: Idd42a7bc40626bce974ea000b61fdb5bad33851c
Reviewed-on: https://boringssl-review.googlesource.com/c/31304
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Reviewed-by: Adam Langley <agl@google.com>
Change-Id: I84cda22a1086bce0da4797afae7975b3f39625de
Reviewed-on: https://boringssl-review.googlesource.com/c/32844
Commit-Queue: David Benjamin <davidben@google.com>
Reviewed-by: David Benjamin <davidben@google.com>
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A split SSL handshake may involve 2 binaries, potentially built at
different versions: call them the "handoff/handback" binary and the
"handshake" binary. We would like to guarantee that the
handoff/handback binary does not make any promises that the handshake
binary cannot keep.
As a start, this commit serializes |kCiphers| to the handoff message.
When the handoff message is applied to an |SSL|, any configured
ciphers not listed in the handoff message will be removed, in order to
prevent them from being negotiated.
Subsequent commits will apply the same approach to other lists of features.
Change-Id: Idf6dbeadb750c076ab0509c09b9d3f22eb162b9c
Reviewed-on: https://boringssl-review.googlesource.com/c/29264
Reviewed-by: Matt Braithwaite <mab@google.com>
This is an extremely important and practical use case. The comment that
state->calls is bounded by the reseed interval isn't quite true. We only
check on entry to the function, which means that it may exceed it by one
call's worth. Switch it to a size_t (which doesn't actually increase
memory because the struct was already padded).
Change-Id: Ia7646fd5b4142789c1d613280223baa4cd1a4a9b
Reviewed-on: https://boringssl-review.googlesource.com/c/32804
Commit-Queue: David Benjamin <davidben@google.com>
Commit-Queue: Adam Langley <agl@google.com>
Reviewed-by: Adam Langley <agl@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
Avoid forcing the QUIC implementation to buffer this when we already have code
to do it. This also avoids QUIC implementations relying on this hook being
called for each individual message.
Change-Id: If2d70f045a25da1aa2b10fdae262cae331da06b1
Reviewed-on: https://boringssl-review.googlesource.com/c/32785
Commit-Queue: Steven Valdez <svaldez@google.com>
Reviewed-by: Steven Valdez <svaldez@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
0-RTT support and APIs to consume NewSessionTicket will be added in a
follow-up.
Change-Id: Ib2b2c6b618b3e33a74355fb53fdbd2ffafcc5c56
Reviewed-on: https://boringssl-review.googlesource.com/c/31744
Commit-Queue: Steven Valdez <svaldez@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
Reviewed-by: Steven Valdez <svaldez@google.com>
Reviewed-by: David Benjamin <davidben@google.com>
Uses have been either migrated to
OPENSSL_NO_THREADS_CORRUPT_MEMORY_AND_LEAK_SECRETS_IF_THREADED or removed.
Update-Note: Anything still relying on OPENSSL_NO_THREADS should be updated to
either use OPENSSL_NO_THREADS_CORRUPT_MEMORY_AND_LEAK_SECRETS_IF_THREADED if a
single-threaded-only platform, or fixed to depend on the platform threading
library.
Change-Id: I02ec63bc7ede892bd6463f1a23e2cec70887fab3
Reviewed-on: https://boringssl-review.googlesource.com/c/32744
Commit-Queue: Adam Langley <agl@google.com>
Reviewed-by: Adam Langley <agl@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
Ryan noticed that CBS_ASN1_{SEQUENCE,SET} used CBS_ASN1_CONSTRUCTED
before it was defined. The C preprocessor expands late, so this works,
but it is weird. Flip the order.
There was also some question about the constructed bit, which is
different from how ASN.1 formally specifies it. (ASN.1 believes the
constructed bit is a property of the element, not the tag. We fold it in
because it's entirely computable[*] from the type in DER, so it's easier
to fold it in.) Move existing text to the section header and expand on
it.
[*] DER forbids constructed strings so string types are always
primitive. ASN.1 forbids implicitly tagging CHOICE or ANY, so the
inherited constructed bit cannot vary by value.
Change-Id: Ieb91f9d6898d582dda19fec8b042051b67f217a8
Reviewed-on: https://boringssl-review.googlesource.com/c/32725
Reviewed-by: Ryan Sleevi <rsleevi@chromium.org>
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: Adam Langley <agl@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
tls_cbc.c is concerned with the variation in where the padding+mac may
end, counted in blocks. Hash blocks are larger than block cipher blocks,
and the hash itself appends some padding. Thus maximal padding off a
64-hash.Size() bytes may not fully stress things.
Just run all inputs modulo the hash block size, so we don't have to
think very hard about the "most difficult" input.
Change-Id: I8da1427dfff855931c14a9135c22afbff4f367c0
Reviewed-on: https://boringssl-review.googlesource.com/c/32724
Commit-Queue: Adam Langley <agl@google.com>
Reviewed-by: Adam Langley <agl@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
Although this macro is not public API and is unused in BoringSSL,
wpa_supplicant uses it to define its own stacks. Remove this once
wpa_supplicant has been fixed.
Change-Id: I1f85e06efe4057b6490bf93bf4dea773dcb491c5
Reviewed-on: https://boringssl-review.googlesource.com/c/32764
Reviewed-by: Robert Sloan <varomodt@google.com>
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: Adam Langley <agl@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
Symptom: When using larger hash functions and short messages,
these six blocks take too much time to be conditionally copied.
Observations:
- SHA-384 consumes more data per iteration, unlike SHA-256.
- The value of `kVarianceBlocks` must depend on the parameters
of the selected hash algorithm.
- Avoid magic constants.
Changes:
- A new formula for the kVarianceBlocks value.
- Stronger test vectors were created in change: 32724.
- The new formula passes these tests.
Discussion:
OpenSSL team: https://github.com/openssl/openssl/pull/7342
Quoting mattcaswell:
> The "real" data that needs to be hashed has to be padded for the
> hashing algorithm. For SHA1 the smallest amount of padding that
> can be added is the "0x80" byte plus 8 bytes containing the message
> length, i.e. 9 bytes. If the data length is within 9 bytes of the
> end of the hash block boundary then the padding will push it into
> an extra block to be hashed.
Change-Id: Id1ad2389927014316eed2b453aac6e4c2a585c5c
Reviewed-on: https://boringssl-review.googlesource.com/c/32624
Reviewed-by: Adam Langley <agl@google.com>
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: Adam Langley <agl@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
