If the caller asked for the base to be treated as secret, we should
provide that. Allowing unbounded inputs is not compatible with being
constant-time.
Additionally, this aligns with the guidance here:
https://github.com/HACS-workshop/spectre-mitigations/blob/master/crypto_guidelines.md#1-do-not-conditionally-choose-between-constant-and-non-constant-time
Update-Note: BN_mod_exp_mont_consttime and BN_mod_exp_mont now require
inputs be fully reduced. I believe current callers tolerate this.
Additionally, due to a quirk of how certain operations were ordered,
using (publicly) zero exponent tolerated a NULL BN_CTX while other
exponents required non-NULL BN_CTX. Non-NULL BN_CTX is now required
uniformly. This is unlikely to cause problems. Any call site where the
exponent is always zero should just be replaced with BN_value_one().
Change-Id: I7c941953ea05f36dc2754facb9f4cf83a6789c61
Reviewed-on: https://boringssl-review.googlesource.com/27665
Commit-Queue: David Benjamin <davidben@google.com>
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Reviewed-by: Steven Valdez <svaldez@google.com>
As the point may be the output of some private key operation, whether Z
accidentally hit one is secret.
Bug: 239
Change-Id: I7db34cd3b5dd5ca4b96980e8993a9b4eda49eb88
Reviewed-on: https://boringssl-review.googlesource.com/27664
Reviewed-by: Adam Langley <alangley@gmail.com>
We have little-endian BIGNUM functions now.
Change-Id: Iffc46a14e75c6bba2e170b824b1a08c69d2e9d18
Reviewed-on: https://boringssl-review.googlesource.com/27594
Reviewed-by: Adam Langley <alangley@gmail.com>
This is adapted from upstream's
eb7916960bf50f436593abe3d5f2e0592d291017.
This gives a 22% win for ECDSA signing. (Upstream cites 30-40%, but they
are unnecessarily using BN_mod_exp_mont_consttime in their generic path.
The exponent is public. I expect part of their 30-40% is just offsetting
this.)
Did 506000 ECDSA P-256 signing operations in 25044595us (20204.0 ops/sec)
Did 170506 ECDSA P-256 verify operations in 25033567us (6811.1 ops/sec)
Did 618000 ECDSA P-256 signing operations in 25031294us (24689.1 ops/sec)
Did 182240 ECDSA P-256 verify operations in 25006918us (7287.6 ops/sec)
Most of the performance win appears to be from the assembly operations
and not the addition chain. I have a CL to graft the addition chain onto
the C implementation, but it did not show measurable improvement in
ECDSA verify. ECDSA sign gets 2-4% faster, but we're more concerned
about ECDSA verify in the OPENSSL_SMALL builds.
Change-Id: Ide166f98b146c025f7f80ed7906336c16818540a
Reviewed-on: https://boringssl-review.googlesource.com/27593
Reviewed-by: Adam Langley <alangley@gmail.com>
This introduces a hook for the OpenSSL assembly.
Change-Id: I35e0588f0ed5bed375b12f738d16c9f46ceedeea
Reviewed-on: https://boringssl-review.googlesource.com/27592
Reviewed-by: Adam Langley <alangley@gmail.com>
Largely random data, but make it easy to add things in the future.
Change-Id: I30bee790bd9671b4d0327c2244fe5cd1a8954f90
Reviewed-on: https://boringssl-review.googlesource.com/27591
Reviewed-by: Adam Langley <alangley@gmail.com>
This imports the assembly portion of
eb7916960bf50f436593abe3d5f2e0592d291017 from upstream. Note the
OPENSSL_ia32cap_P bits were tweaked to be delocate-compatible. Those
should be reviewed against the original file.
Change-Id: I19eef722225bb7928275e3d93890f80aa2f8734d
Reviewed-on: https://boringssl-review.googlesource.com/27589
Reviewed-by: Adam Langley <alangley@gmail.com>
We were still using the allocating scalar inversion for ECDSA verify
because previously it seemed to be faster. It appears to have flipped
now, though probably was always just a wash.
While I'm here, save a multiplication by swapping the inversion and
Montgomery reduction.
Did 200000 ECDSA P-256 signing operations in 10025749us (19948.6 ops/sec)
Did 66234 ECDSA P-256 verify operations in 10061123us (6583.2 ops/sec)
Did 202000 ECDSA P-256 signing operations in 10020846us (20158.0 ops/sec)
Did 68052 ECDSA P-256 verify operations in 10020592us (6791.2 ops/sec)
The actual motivation is to get rid of the unchecked EC_SCALAR function
and align sign/verify in preparation for the assembly scalar ops.
Change-Id: I1bd3a5719a67966dc8edaa43535a3864b69f76d0
Reviewed-on: https://boringssl-review.googlesource.com/27588
Reviewed-by: Adam Langley <alangley@gmail.com>
No sense in adding impossible error cases we need to handle.
Additionally, tighten them a bit and require strong bounds. (I wasn't
sure what we'd need at first and made them unnecessarily general.)
Change-Id: I21a0afde90a55be2e9a0b8d7288f595252844f5f
Reviewed-on: https://boringssl-review.googlesource.com/27586
Reviewed-by: Adam Langley <alangley@gmail.com>
This is so the *_small functions can assume somewhat more uniform
widths, to simplify their error-handling.
Change-Id: I0420cb237084b253e918c64b0c170a5dfd99ab40
Reviewed-on: https://boringssl-review.googlesource.com/27584
Reviewed-by: Adam Langley <alangley@gmail.com>
After e325c3f471, this typo bites and
causes SSL_CTX_get_extra_chain_certs to return an empty stack.
Change-Id: I6aa7093d1ca4f3ba0f520a644b14de5b3a3ccaa6
Reviewed-on: https://boringssl-review.googlesource.com/27604
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The FIPS 186-4 algorithm we use includes a limit which hits a 2^-20
failure probability, assuming my math is right. We've observed roughly
2^-23. This is a little large at scale. (See b/77854769.)
To avoid modifying the FIPS algorithm, retry the whole thing four times
to bring the failure rate down to 2^-80. Along the way, now that I have
the derivation on hand, adjust
https://boringssl-review.googlesource.com/22584 to target the same
failure probability.
Along the way, fix an issue with RSA_generate_key where, if callers
don't check for failure, there may be half a key in there.
Change-Id: I0e1da98413ebd4ffa65fb74c67a58a0e0cd570ff
Reviewed-on: https://boringssl-review.googlesource.com/27288
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https://boringssl-review.googlesource.com/10520 and then later
https://boringssl-review.googlesource.com/25285 made BN_MONT_CTX_set
constant-time, which is necessary for RSA's mont_p and mont_q. However,
due to a typo in the benchmark, they did not correctly measure.
Split BN_MONT_CTX creation into a constant-time and variable-time one.
The constant-time one uses our current algorithm and the latter restores
the original BN_mod codepath.
Should we wish to avoid BN_mod, I have an alternate version lying
around:
First, BN_set_bit + bn_mod_lshift1_consttime as now to count up to 2*R.
Next, observe that 2*R = BN_to_montgomery(2) and R*R =
BN_to_montgomery(R) = BN_to_montgomery(2^r_bits) Also observe that
BN_mod_mul_montgomery only needs n0, not RR. Split the core of
BN_mod_exp_mont into its own function so the caller handles conversion.
Raise 2*R to the r_bits power to get 2^r_bits*R = R*R.
The advantage of that algorithm is that it is still constant-time, so we
only need one BN_MONT_CTX_new. Additionally, it avoids BN_mod which is
otherwise (almost, but the remaining links should be easy to cut) out of
the critical path for correctness. One less operation to worry about.
The disadvantage is that it is gives a 25% (RSA-2048) or 32% (RSA-4096)
slower RSA verification speed. I went with the BN_mod one for the time
being.
Before:
Did 9204 RSA 2048 signing operations in 10052053us (915.6 ops/sec)
Did 326000 RSA 2048 verify (same key) operations in 10028823us (32506.3 ops/sec)
Did 50830 RSA 2048 verify (fresh key) operations in 10033794us (5065.9 ops/sec)
Did 1269 RSA 4096 signing operations in 10019204us (126.7 ops/sec)
Did 88435 RSA 4096 verify (same key) operations in 10031129us (8816.1 ops/sec)
Did 14552 RSA 4096 verify (fresh key) operations in 10053411us (1447.5 ops/sec)
After:
Did 9150 RSA 2048 signing operations in 10022831us (912.9 ops/sec)
Did 322000 RSA 2048 verify (same key) operations in 10028604us (32108.2 ops/sec)
Did 289000 RSA 2048 verify (fresh key) operations in 10017205us (28850.4 ops/sec)
Did 1270 RSA 4096 signing operations in 10072950us (126.1 ops/sec)
Did 87480 RSA 4096 verify (same key) operations in 10036328us (8716.3 ops/sec)
Did 80730 RSA 4096 verify (fresh key) operations in 10073614us (8014.0 ops/sec)
Change-Id: Ie8916d1634ccf8513ceda458fa302f09f3e93c07
Reviewed-on: https://boringssl-review.googlesource.com/27287
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The first non-zero window (which we can condition on for public
exponents) always multiplies by one. This means we can cut out one
Montgomery multiplication. It also means we never actually need to
initialize r to one, saving another Montgomery multiplication for P-521.
This, in turn, means we don't need the bn_one_to_montgomery optimization
for the public-exponent exponentations, so we can delete
bn_one_to_montgomery_small. (The function does currently promise to
handle p = 0, but this is not actually reachable, so it can just do a
reduction on RR.)
For RSA, where we're not doing many multiplications to begin with,
saving one is noticeable.
Before:
Did 92000 RSA 2048 verify (same key) operations in 3002557us (30640.6 ops/sec)
Did 25165 RSA 4096 verify (same key) operations in 3045046us (8264.2 ops/sec)
After:
Did 100000 RSA 2048 verify (same key) operations in 3002483us (33305.8 ops/sec)
Did 26603 RSA 4096 verify (same key) operations in 3010942us (8835.4 ops/sec)
(Not looking at the fresh key number yet as that still needs to be
fixed.)
Change-Id: I81a025a68d9b0f8eb0f9c6c04ec4eedf0995a345
Reviewed-on: https://boringssl-review.googlesource.com/27286
Reviewed-by: Adam Langley <agl@google.com>
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Change-Id: If3d93648cf6561c02c208895526ae1f1cbfa2b51
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Otherwise Clang has to assign a file entry to the label which conflicts with
later, explicit, file entries.
Change-Id: Ifc782821517aa7b48ba3ef304d4468f2bc850ac2
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This schism came up in passing again, and I realized we never added a
TLS-level test for this. Fix that.
Change-Id: I10f910bb5a975d6b3b73d99e7412ade35654fddb
Reviewed-on: https://boringssl-review.googlesource.com/27224
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It's defined to return one in Montgomery form, not a normal one.
(Not that this matters. This function is only used to Fermat's Little
Theorem. Probably it should have been less general, though we'd need to
make new test vectors first.)
Change-Id: Ia8d7588e6a413b25f01280af9aacef0192283771
Reviewed-on: https://boringssl-review.googlesource.com/27285
Reviewed-by: Adam Langley <agl@google.com>
BN_mod_exp_mont is intended to protect the base, but not the exponent.
Accordingly, it shouldn't treat a base of zero as special.
Change-Id: Ib053e8ce65ab1741973a9f9bfeff8c353567439c
Reviewed-on: https://boringssl-review.googlesource.com/27284
Reviewed-by: Adam Langley <agl@google.com>
Our technique to perform the reduction only works for balanced key
sizes. For unbalanced keys, we fall back to variable-time logic.
Instead, fall back earlier to the non-CRT codepath, which is still
secure, just slower. This also aligns with the advice here:
https://github.com/HACS-workshop/spectre-mitigations/blob/master/crypto_guidelines.md#1-do-not-conditionally-choose-between-constant-and-non-constant-time
Update-Note: This is a performance hit (some keys will run 3x slower),
but only for keys with different-sized primes. I believe the Windows
crypto APIs will not accept such keys at all. There are two scenarios to
be concerned with for RSA performance:
1. Performance of reasonably-generated keys. Keys that BoringSSL or
anyone else reasonable generates will all be balanced, so this change
does not affect them.
2. Worst-case performance for DoS purposes. This CL does not change the
worst-case performance for RSA at a given bit size. In fact, it improves
it slightly. A sufficiently unbalanced RSA key is as slow as not doing
CRT at all.
In both cases, this change does not affect performance. The affected
keys are pathologically-generated ones that were not quite pathological
enough.
Bug: 235
Change-Id: Ie298dabb549ab9108fa9374aa86ebffe8b6c6c88
Reviewed-on: https://boringssl-review.googlesource.com/27504
Reviewed-by: Adam Langley <agl@google.com>
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data_plus_mac_size is secret. Values derived from it cannot quite be
safely divided by md_block_size because SHA-384 ciphers prevent that
field from being constant. We know the value is a power of two, so do
the strength reduction by hand.
Change-Id: Id62ab9e646f4e21d507a7059cfe84d49bbb986e6
Reviewed-on: https://boringssl-review.googlesource.com/27505
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This too is connection-level state to be reset on SSL_clear.
Change-Id: I071c9431c28a7d0ff3eb20c679784d4aa4c236a5
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Chrome uses the platform certificate verifier and thus cannot reliably
expect PSS signatures to work in all configurations. Add an API for the
consumer to inform BoringSSL of this ability. We will then adjust our
advertisements accordingly.
Note that, because TLS 1.2 does not have the signature_algorithms_cert
extension, turning off TLS 1.3 and using this API will stop advertising
RSA-PSS. I believe this is the correct behavior given the semantics of
that code point.
The tests check the various combinations here, as well as checking that
the peer never sends signature_algorithms_cert identical to
signature_algorithms.
Bug: 229
Change-Id: I8c33a93efdc9252097e3899425b49548fc42a93a
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It's hard to diagnose "20".
Change-Id: I57e8d0fb6e4937ddeca45b3645463ca0dc872ea6
Reviewed-on: https://boringssl-review.googlesource.com/27487
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This reflects the change to add the key type into the constant. The old
constants are left around for now as legacy aliases and will be removed
later.
Change-Id: I67f1b50c01fbe0ebf4a2e9e89d3e7d5ed5f5a9d7
Reviewed-on: https://boringssl-review.googlesource.com/27486
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Update-Note: I believe everything relying on this overload has since
been updated.
Change-Id: I7facf59cde56098e5e3c79470293b67abb715f4c
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These are connection state, so they should be reset on SSL_clear.
Change-Id: I861fe52578836615d2719c9e1ff0911c798f336e
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Conscrypt need this function right now. They ought to be fixed up to not
need this but, in the meantime, this API is also provided by OpenSSL and
will clear one most consumer reaching into SSL_SESSION.
Bumping the API since Conscrypt often involves multi-sided stuff.
Change-Id: I665ca6b6a17ef479133c29c23fc639f278128c69
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In addition, make use of bssl::ScopedEVP_MD_CTX in |SpeedHashChunk|,
otherwise the ctx doesn't get destroyed on failure.
Change-Id: I5828080cb9f4eb7c77cc2ff185d9aa8135311385
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OpenSSL 1.1.0 renamed that. Also clang-format wanted to smush it all
onto one line.
Change-Id: Icdaa0eefc503c4aab1b309ccb34625f5e811c537
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Change-Id: Iceed87c194201d28c4a51b1c19a59fe2f20b6a5e
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In the handoff+handback case, bssl_shim.cc creates 3 |SSL| objects:
one to receive the ClientHello, one to receive the handoff, and a
third one to receive the handback.
Before 56986f9, only the first of these received any configuration.
Since that commit, all 3 of them receive the same configuration. That
means that the handback message no longer needs to serialize as many
things.
N.B. even before 56986f9, not all of the fields were necessary. For
example, there was no reason to serialize |conf_max_version| and
|conf_min_version| in the handback, so far as I can tell.
This commit is mechanical: it simply removes everything that doesn't
cause any tests to fail. In the long run, I'll need to carefully
check for two possibilities:
- Knobs that affect the handshake after the server's first message it
sent. These are troublesome because that portion of the handshake
may run on a different |SSL|, depending on whether the handback is
early or late.
- Getters that may be called post-handshake, and that callers may
reasonably expect to reflect the value that was used during
handshake.
(I'm not sure that either case exists!)
Change-Id: Ibf6e0be6609ad6e83ab50e69199e9b2d51e59a87
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(Found by fuzzing: a zero value causes an infinite loop.)
Change-Id: I984fd88d85fb87616b5e806795c10334f4379744
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This separates the source lists for the crypto and ssl targets from
their headers, so the header files can be listed in the 'public'
section of the targets. This allows tighter GN checking and expresses
the build structure more cleanly.
Change-Id: Ifb20c90977d7e858734654d9a03949be19a9c43a
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The last-minute TLS 1.3 change was done partly for consistency with DTLS
1.3, where authenticating the record header is less obviously pointless
than in TLS. There, reconstructing it would be messy. Instead, pass in
the record header and let SSLAEADContext decide whether or not to
assemble its own.
(While I'm here, reorder all the flags so the AD and nonce ones are
grouped together.)
Change-Id: I06e65d526b21a08019e5ca6f1b7c7e0e579e7760
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https://boringssl-review.googlesource.com/10522 didn't actually do what
it was supposed to do. In fact, it appears, not paying attention to it,
we've managed to make RSA verify slower than ECDSA verify. Oops.
Did 32000 RSA 2048 verify (same key) operations in 1016746us (31473.0 ops/sec)
Did 5525 RSA 2048 verify (fresh key) operations in 1067209us (5177.1 ops/sec)
Did 8957 ECDSA P-256 verify operations in 1078570us (8304.5 ops/sec)
The difference is in setting up the BN_MONT_CTX, either computing R^2 or n0.
I'm guessing R^2. The current algorithm needs to be constant-time, but we can
split out a variable-time one if necessary.
Change-Id: Ie064a0e464aaa803815b56a6734bc9e2becef1a7
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If we don't have OID data for an object then we should fail if we
are asked to encode the ASN.1 for that OID.
(Imported from upstream's f3f8e72f494b36d05e0d04fe418f92b692fbb261.)
Change-Id: I3c3d3a3b236bca374fde3c0d02504140f2992602
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This is helpful at smaller sizes because the benefits of an unlikely hit
by trival-division are smaller.
The full set of kPrimes eliminates about 94.3% of random numbers. The
first quarter eliminates about 93.2% of them. But the little extra power
of the full set seems to be borderline for RSA 3072 and clearly positive
for RSA 4096.
Did 316 RSA 2048 key-gen operations in 30035598us (10.5 ops/sec)
min: 19423us, median: 80448us, max: 394265us
Change-Id: Iee53f721329674ae7a08fabd85b4f645c24e119d
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