| commit | 1044553d6d43632d0272e60b21166bb41e49bfa2 | [log] [tgz] |
|---|---|---|
| author | David Benjamin <davidben@google.com> | Sun Mar 04 02:51:04 2018 -0500 |
| committer | Adam Langley <alangley@gmail.com> | Fri Mar 30 19:53:36 2018 +0000 |
| tree | c34eddf4904def253787dc36e70825d95d9cd0f1 | |
| parent | 23af438ccd9304b94922cf299d0614ee40a47d9c [diff] |
Add new GCD and related primitives. RSA key generation requires computing a GCD (p-1 and q-1 are relatively prime with e) and an LCM (the Carmichael totient). I haven't made BN_gcd itself constant-time here to save having to implement bn_lshift_secret_shift, since the two necessary operations can be served by bn_rshift_secret_shift, already added for Rabin-Miller. However, the guts of BN_gcd are replaced. Otherwise, the new functions are only connected to tests for now, they'll be used in subsequent CLs. To support LCM, there is also now a constant-time division function. This does not replace BN_div because bn_div_consttime is some 40x slower than BN_div. That penalty is fine for RSA keygen because that operation is not bottlenecked on division, so we prefer simplicity over performance. Median of 29 RSA keygens: 0m0.212s -> 0m0.225s (Accuracy beyond 0.1s is questionable.) Bug: 238 Change-Id: Idbfbfa6e7f5a3b8782ce227fa130417b3702cf97 Reviewed-on: https://boringssl-review.googlesource.com/26369 Reviewed-by: Adam Langley <alangley@gmail.com>
BoringSSL is a fork of OpenSSL that is designed to meet Google's needs.
Although BoringSSL is an open source project, it is not intended for general use, as OpenSSL is. We don't recommend that third parties depend upon it. Doing so is likely to be frustrating because there are no guarantees of API or ABI stability.
Programs ship their own copies of BoringSSL when they use it and we update everything as needed when deciding to make API changes. This allows us to mostly avoid compromises in the name of compatibility. It works for us, but it may not work for you.
BoringSSL arose because Google used OpenSSL for many years in various ways and, over time, built up a large number of patches that were maintained while tracking upstream OpenSSL. As Google's product portfolio became more complex, more copies of OpenSSL sprung up and the effort involved in maintaining all these patches in multiple places was growing steadily.
Currently BoringSSL is the SSL library in Chrome/Chromium, Android (but it's not part of the NDK) and a number of other apps/programs.
There are other files in this directory which might be helpful: