Fix a grammar nit in CRYPTO_get_ex_new_index.pod

[openssl.git] / doc / man3 / EC_POINT_add.pod

diff --git a/doc/man3/EC_POINT_add.pod b/doc/man3/EC_POINT_add.pod
index 3c047e1ab0090ac6a21aa35f2e3a181b1f139a18..9b71d71f55cf5a88f40dcee236f6395e04db0451 100644 (file)
--- a/doc/man3/EC_POINT_add.pod
+++ b/doc/man3/EC_POINT_add.pod
@@ -43,10 +43,12 @@ The functions EC_POINT_make_affine and EC_POINTs_make_affine force the internal
 co-ordinate system. In the case of EC_POINTs_make_affine the value B<num> provides the number of points in the array B<points> to be
 forced.
 
-EC_POINT_mul calculates the value generator * B<n> + B<q> * B<m> and stores the result in B<r>. The value B<n> may be NULL in which case the result is just B<q> * B<m>.
+EC_POINT_mul is a convenient interface to EC_POINTs_mul: it calculates the value generator * B<n> + B<q> * B<m> and stores the result in B<r>.
+The value B<n> may be NULL in which case the result is just B<q> * B<m> (variable point multiplication). Alternatively, both B<q> and B<m> may be NULL, and B<n> non-NULL, in which case the result is just generator * B<n> (fixed point multiplication).
+When performing a single fixed or variable point multiplication, the underlying implementation uses a constant time algorithm, when the input scalar (either B<n> or B<m>) is in the range [0, ec_group_order).
 
-EC_POINTs_mul calculates the value generator * B<n> + B<q[0]> * B<m[0]> + ... + B<q[num-1]> * B<m[num-1]>. As for EC_POINT_mul the value
-B<n> may be NULL.
+EC_POINTs_mul calculates the value generator * B<n> + B<q[0]> * B<m[0]> + ... + B<q[num-1]> * B<m[num-1]>. As for EC_POINT_mul the value B<n> may be NULL or B<num> may be zero.
+When performing a fixed point multiplication (B<n> is non-NULL and B<num> is 0) or a variable point multiplication (B<n> is NULL and B<num> is 1), the underlying implementation uses a constant time algorithm, when the input scalar (either B<n> or B<m[0]>) is in the range [0, ec_group_order).
 
 The function EC_GROUP_precompute_mult stores multiples of the generator for faster point multiplication, whilst
 EC_GROUP_have_precompute_mult tests whether precomputation has already been done. See L<EC_GROUP_copy(3)> for information
@@ -74,9 +76,9 @@ L<EC_GFp_simple_method(3)>, L<d2i_ECPKParameters(3)>
 
 =head1 COPYRIGHT
 
-Copyright 2013-2017 The OpenSSL Project Authors. All Rights Reserved.
+Copyright 2013-2018 The OpenSSL Project Authors. All Rights Reserved.
 
-Licensed under the OpenSSL license (the "License").  You may not use
+Licensed under the Apache License 2.0 (the "License").  You may not use
 this file except in compliance with the License.  You can obtain a copy
 in the file LICENSE in the source distribution or at
 L<https://www.openssl.org/source/license.html>.