If y is zero, there is no point with odd y, so the odd bit may not be
set, hence EC_R_INVALID_COMPRESSION_BIT. This code instead computed the
Kronecker symbol of x and changed the error code to
EC_R_INVALID_COMPRESSED_POINT if not a square.
As the comment says, this was (intended to be) unreachable. But it
seems x was a typo for tmp1. It dates to before upstream's
6fb60a84dd1ec81953917e0444dab50186617432, when BN_mod_sqrt gave
garbage if its input was not square. Now it emits BN_R_NOT_A_SQUARE.
Upstream's 48fe4d6233ac2d60745742a27f820dd88bc6689d then mapped
BN_R_NOT_A_SQUARE to EC_R_INVALID_COMPRESSED_POINT.
Change-Id: Id9e02fa1c154b61cc0c3a768c9cfe6bd9674c378
Reviewed-on: https://boringssl-review.googlesource.com/12463
Reviewed-by: Adam Langley <agl@google.com>
Don't try to fix a bad |x| coordinate by reducing it. Instead, just
fail. This also makes the code clearer; in particular, it was confusing
why |x_| was used for some calculations when it seems like |x| was just
as good or better.
Change-Id: I9a6911f0d2bd72852a26b46f3828eb5ba3ef924f
Reviewed-on: https://boringssl-review.googlesource.com/7440
Reviewed-by: David Benjamin <davidben@google.com>
This slightly simplifies the SSL_ECDH code and will be useful later on
in reimplementing the key parsing logic.
Change-Id: Ie41ea5fd3a9a734b3879b715fbf57bd991e23799
Reviewed-on: https://boringssl-review.googlesource.com/6858
Reviewed-by: Adam Langley <agl@google.com>
|EC_POINT_point2oct| would encode ∞, which is surprising, and
|EC_POINT_oct2point| would decode ∞, which is insane. This change
removes both behaviours.
Thanks to Brian Smith for pointing it out.
Change-Id: Ia89f257dc429a69b9ea7b7b15f75454ccc9c3bdd
Reviewed-on: https://boringssl-review.googlesource.com/6488
Reviewed-by: Adam Langley <agl@google.com>
In the case of a compressed point, the decompression ensures that the
point is on the curve. In the uncompressed case,
|EC_POINT_set_affine_coordinates_GFp| checks that the point is on the
curve as of 38feb990a1.
Change-Id: Icd69809ae396838b4aef4fa89b3b354560afed55
Reviewed-on: https://boringssl-review.googlesource.com/6487
Reviewed-by: Brian Smith <brian@briansmith.org>
Reviewed-by: Adam Langley <agl@google.com>
None of these methods vary per group. Factoring these out of
|EC_METHOD| should help some toolchains to do a better job optimizing
the code for size.
Change-Id: Ibd22a52992b4d549f12a8d22bddfdb3051aaa891
Reviewed-on: https://boringssl-review.googlesource.com/6172
Reviewed-by: Adam Langley <alangley@gmail.com>
The documentation for |BN_CTX_get| states: "Once |BN_CTX_get| has
returned NULL, all future calls will also return NULL until
|BN_CTX_end| is called." Some code takes advantage of that guarantee
by only checking the return value of the last call to |BN_CTX_get| in a
series of calls. That is correct and the most efficient way of doing
it. However, that pattern is inconsistent with most of the other uses
of |BN_CTX_get|. Also, static analysis tools like Coverity cannot
understand that pattern. This commit removes the instances of that
pattern that Coverity complained about when scanning *ring*.
Change-Id: Ie36d0223ea1caee460c7979547cf5bfd5fb16f93
Reviewed-on: https://boringssl-review.googlesource.com/5611
Reviewed-by: Adam Langley <agl@google.com>
According to rfc5480 and rfc4492 the hybrid format is not allowed
neither in certificates or the tls protocol.
Change-Id: I1d3fb5bef765bc7b58d29bdd60e15247fac4dc7a
Reviewed-on: https://boringssl-review.googlesource.com/2510
Reviewed-by: Adam Langley <agl@google.com>
Saves doing it ad-hoc all the time.
Change-Id: Ic1a1180f56eec37c19799649bb8f18237bd617f8
Reviewed-on: https://boringssl-review.googlesource.com/2241
Reviewed-by: Adam Langley <agl@google.com>
Initial fork from f2d678e6e89b6508147086610e985d4e8416e867 (1.0.2 beta).
(This change contains substantial changes from the original and
effectively starts a new history.)
