ECDSA: remove nonce padding (delegated to EC_POINT_mul)

* EC_POINT_mul is now responsible for constant time point multiplication
  (for single fixed or variable point multiplication, when the scalar is
  in the range [0,group_order), so we need to strip the nonce padding
  from ECDSA.
* Entry added to CHANGES
* Updated EC_POINT_mul documentation
  - Integrate existing EC_POINT_mul and EC_POINTs_mul entries in the
    manpage to reflect the shift in constant-time expectations when
    performing a single fixed or variable point multiplication;
  - Add documentation to ec_method_st to reflect the updated "contract"
    between callers and implementations of ec_method_st.mul.

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Andy Polyakov <appro@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/6070)

1 files changed, 4 insertions, 0 deletions

diff --git a/CHANGES b/CHANGES
index a13183f9e8..08586c09d3 100644
--- a/CHANGES
+++ b/CHANGES
@@ -9,6 +9,10 @@
 
  Changes between 1.1.0h and 1.1.1 [xx XXX xxxx]
 
+  *) Remove ECDSA nonce padding: EC_POINT_mul is now responsible for
+     constant time fixed point multiplication.
+     [Billy Bob Brumley]
+
   *) Updated CONTRIBUTING
      [Rich Salz]