mirror/openssl
2
0
Fork 0
mirror of https://github.com/openssl/openssl.git synced 2025-03-31 20:10:45 +08:00
Code Issues Packages Projects Releases Wiki Activity

Add documentation for the new non-curve type specific EC functions

Browse Source 
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/6815)
This commit is contained in:
Matt Caswell 2018-07-30 16:06:12 +01:00
parent 8e3cced75f
commit de34e45a64
2 changed files with 77 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
doc/man3/EC_GROUP_new.pod
View File

@ -2,12 +2,22 @@
=head1 NAME
EC_GROUP_get_ecparameters, EC_GROUP_get_ecpkparameters,
EC_GROUP_new, EC_GROUP_new_from_ecparameters,
EC_GROUP_get_ecparameters,
EC_GROUP_get_ecpkparameters,
EC_GROUP_new,
EC_GROUP_new_from_ecparameters,
EC_GROUP_new_from_ecpkparameters,
EC_GROUP_free, EC_GROUP_clear_free, EC_GROUP_new_curve_GFp,
EC_GROUP_new_curve_GF2m, EC_GROUP_new_by_curve_name, EC_GROUP_set_curve_GFp,
EC_GROUP_get_curve_GFp, EC_GROUP_set_curve_GF2m, EC_GROUP_get_curve_GF2m,
EC_GROUP_free,
EC_GROUP_clear_free,
EC_GROUP_new_curve_GFp,
EC_GROUP_new_curve_GF2m,
EC_GROUP_new_by_curve_name,
EC_GROUP_set_curve,
EC_GROUP_get_curve,
EC_GROUP_set_curve_GFp,
EC_GROUP_get_curve_GFp,
EC_GROUP_set_curve_GF2m,
EC_GROUP_get_curve_GF2m,
EC_get_builtin_curves - Functions for creating and destroying EC_GROUP
objects
@ -27,6 +37,10 @@ objects
const BIGNUM *b, BN_CTX *ctx);
EC_GROUP *EC_GROUP_new_by_curve_name(int nid);
int EC_GROUP_set_curve(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a,
const BIGNUM *b, BN_CTX *ctx);
int EC_GROUP_get_curve(const EC_GROUP *group, BIGNUM *p, BIGNUM *a, BIGNUM *b,
BN_CTX *ctx);
int EC_GROUP_set_curve_GFp(EC_GROUP *group, const BIGNUM *p,
const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx);
int EC_GROUP_get_curve_GFp(const EC_GROUP *group, BIGNUM *p,
@ -58,22 +72,24 @@ Operations in a binary field are performed relative to an B<irreducible polynomi
use a trinomial or a pentanomial for this parameter.
A new curve can be constructed by calling EC_GROUP_new, using the implementation provided by B<meth> (see
L<EC_GFp_simple_method(3)>). It is then necessary to call either EC_GROUP_set_curve_GFp or
EC_GROUP_set_curve_GF2m as appropriate to create a curve defined over Fp or over F2^m respectively.
L<EC_GFp_simple_method(3)>). It is then necessary to call EC_GROUP_set_curve() to set the curve parameters.
EC_GROUP_new_from_ecparameters() will create a group from the
specified B<params> and
EC_GROUP_new_from_ecpkparameters() will create a group from the specific PK B<params>.
EC_GROUP_set_curve_GFp sets the curve parameters B<p>, B<a> and B<b> for a curve over Fp stored in B<group>.
EC_group_get_curve_GFp obtains the previously set curve parameters.
EC_GROUP_set_curve() sets the curve parameters B<p>, B<a> and B<b>. For a curve over Fp B<b>
is the prime for the field. For a curve over F2^m B<p> represents the irreducible polynomial - each bit
represents a term in the polynomial. Therefore there will either be three or five bits set dependent on whether
the polynomial is a trinomial or a pentanomial.
EC_GROUP_set_curve_GF2m sets the equivalent curve parameters for a curve over F2^m. In this case B<p> represents
the irreducible polynomial - each bit represents a term in the polynomial. Therefore there will either be three
or five bits set dependent on whether the polynomial is a trinomial or a pentanomial.
EC_group_get_curve_GF2m obtains the previously set curve parameters.
EC_group_get_curve() obtains the previously set curve parameters.
The functions EC_GROUP_new_curve_GFp and EC_GROUP_new_curve_GF2m are shortcuts for calling EC_GROUP_new and the
appropriate EC_group_set_curve function. An appropriate default implementation method will be used.
EC_GROUP_set_curve_GFp() and EC_GROUP_set_curve_GF2m are synonyms for EC_GROUP_set_curve().
EC_GROUP_get_curve_GFp() and EC_GROUP_get_curve_GF2m are synonyms for EC_GROUP_get_curve().
The functions EC_GROUP_new_curve_GFp and EC_GROUP_new_curve_GF2m are shortcuts for calling EC_GROUP_new and then the
EC_GROUP_set_curve function. An appropriate default implementation method will be used.
Whilst the library can be used to create any curve using the functions described above, there are also a number of
predefined curves that are available. In order to obtain a list of all of the predefined curves, call the function

61
doc/man3/EC_POINT_new.pod
View File

@ -2,16 +2,30 @@
=head1 NAME
EC_POINT_set_Jprojective_coordinates_GFp, EC_POINT_point2buf,
EC_POINT_new, EC_POINT_free, EC_POINT_clear_free,
EC_POINT_copy, EC_POINT_dup, EC_POINT_method_of,
EC_POINT_set_Jprojective_coordinates_GFp,
EC_POINT_point2buf,
EC_POINT_new,
EC_POINT_free,
EC_POINT_clear_free,
EC_POINT_copy,
EC_POINT_dup,
EC_POINT_method_of,
EC_POINT_set_to_infinity,
EC_POINT_get_Jprojective_coordinates_GFp,
EC_POINT_set_affine_coordinates,
EC_POINT_get_affine_coordinates,
EC_POINT_set_compressed_coordinates,
EC_POINT_set_affine_coordinates_GFp,
EC_POINT_get_affine_coordinates_GFp, EC_POINT_set_compressed_coordinates_GFp,
EC_POINT_set_affine_coordinates_GF2m, EC_POINT_get_affine_coordinates_GF2m,
EC_POINT_set_compressed_coordinates_GF2m, EC_POINT_point2oct,
EC_POINT_oct2point, EC_POINT_point2bn, EC_POINT_bn2point, EC_POINT_point2hex,
EC_POINT_get_affine_coordinates_GFp,
EC_POINT_set_compressed_coordinates_GFp,
EC_POINT_set_affine_coordinates_GF2m,
EC_POINT_get_affine_coordinates_GF2m,
EC_POINT_set_compressed_coordinates_GF2m,
EC_POINT_point2oct,
EC_POINT_oct2point,
EC_POINT_point2bn,
EC_POINT_bn2point,
EC_POINT_point2hex,
EC_POINT_hex2point
- Functions for creating, destroying and manipulating EC_POINT objects
@ -34,6 +48,14 @@ EC_POINT_hex2point
const EC_POINT *p,
BIGNUM *x, BIGNUM *y, BIGNUM *z,
BN_CTX *ctx);
int EC_POINT_set_affine_coordinates(const EC_GROUP *group, EC_POINT *p,
const BIGNUM *x, const BIGNUM *y,
BN_CTX *ctx);
int EC_POINT_get_affine_coordinates(const EC_GROUP *group, const EC_POINT *p,
BIGNUM *x, BIGNUM *y, BN_CTX *ctx);
int EC_POINT_set_compressed_coordinates(const EC_GROUP *group, EC_POINT *p,
const BIGNUM *x, int y_bit,
BN_CTX *ctx);
int EC_POINT_set_affine_coordinates_GFp(const EC_GROUP *group, EC_POINT *p,
const BIGNUM *x, const BIGNUM *y,
BN_CTX *ctx);
@ -97,12 +119,18 @@ A valid point on a curve is the special point at infinity. A point is set to
be at infinity by calling EC_POINT_set_to_infinity().
The affine co-ordinates for a point describe a point in terms of its x and y
position. The functions EC_POINT_set_affine_coordinates_GFp() and
EC_POINT_set_affine_coordinates_GF2m() set the B<x> and B<y> co-ordinates for
the point B<p> defined over the curve given in B<group>. The functions
EC_POINT_get_affine_coordinates_GFp() and
EC_POINT_get_affine_coordinates_GF2m() set B<x> and B<y>, either of which may
be NULL, to the corresponding coordinates of B<p>.
position. The function EC_POINT_set_affine_coordinates() sets the B<x> and B<y>
co-ordinates for the point B<p> defined over the curve given in B<group>. The
function EC_POINT_get_affine_coordinates() sets B<x> and B<y>, either of which
may be NULL, to the corresponding coordinates of B<p>.
The functions EC_POINT_set_affine_coordinates_GFp() and
EC_POINT_set_affine_coordinates_GF2m() are synonyms for
EC_POINT_set_affine_coordinates().
The functions EC_POINT_get_affine_coordinates_GFp() and
EC_POINT_get_affine_coordinates_GF2m() are synonyms for
EC_POINT_get_affine_coordinates().
As well as the affine co-ordinates, a point can alternatively be described in
terms of its Jacobian projective co-ordinates (for Fp curves only). Jacobian
@ -119,11 +147,14 @@ EC_POINT_get_Jprojective_coordinates_GFp() respectively.
Points can also be described in terms of their compressed co-ordinates. For a
point (x, y), for any given value for x such that the point is on the curve
there will only ever be two possible values for y. Therefore a point can be set
using the EC_POINT_set_compressed_coordinates_GFp() and
EC_POINT_set_compressed_coordinates_GF2m() functions where B<x> is the x
using the EC_POINT_set_compressed_coordinates() function where B<x> is the x
co-ordinate and B<y_bit> is a value 0 or 1 to identify which of the two
possible values for y should be used.
The functions EC_POINT_set_compressed_coordinates_GFp() and
EC_POINT_set_compressed_coordinates_GF2m() are synonyms for
EC_POINT_set_compressed_coordinates().
In addition B<EC_POINT> can be converted to and from various external
representations. The octet form is the binary encoding of the B<ECPoint>
structure (as defined in RFC5480 and used in certificates and TLS records):