summaryrefslogtreecommitdiff
path: root/src/lib/libcrypto/doc/EC_POINT_new.pod
diff options
context:
space:
mode:
authorschwarze <>2016-11-02 11:57:56 +0000
committerschwarze <>2016-11-02 11:57:56 +0000
commit90c573eba184fe31184d14ce10367f810fa1d417 (patch)
tree62d26e7f75bb451eba292aad57737306b2f28280 /src/lib/libcrypto/doc/EC_POINT_new.pod
parentdb06cab2812484b360f2873ade2dd8277ad08a42 (diff)
downloadopenbsd-90c573eba184fe31184d14ce10367f810fa1d417.tar.gz
openbsd-90c573eba184fe31184d14ce10367f810fa1d417.tar.bz2
openbsd-90c573eba184fe31184d14ce10367f810fa1d417.zip
convert DSA and EC manuals from pod to mdoc
Diffstat (limited to 'src/lib/libcrypto/doc/EC_POINT_new.pod')
-rw-r--r--src/lib/libcrypto/doc/EC_POINT_new.pod123
1 files changed, 0 insertions, 123 deletions
diff --git a/src/lib/libcrypto/doc/EC_POINT_new.pod b/src/lib/libcrypto/doc/EC_POINT_new.pod
deleted file mode 100644
index b41ca0ed0c..0000000000
--- a/src/lib/libcrypto/doc/EC_POINT_new.pod
+++ /dev/null
@@ -1,123 +0,0 @@
1=pod
2
3=head1 NAME
4
5EC_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_set_Jprojective_coordinates, EC_POINT_get_Jprojective_coordinates_GFp, 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_hex2point - Functions for creating, destroying and manipulating B<EC_POINT> objects.
6
7=head1 SYNOPSIS
8
9 #include <openssl/ec.h>
10 #include <openssl/bn.h>
11
12 EC_POINT *EC_POINT_new(const EC_GROUP *group);
13 void EC_POINT_free(EC_POINT *point);
14 void EC_POINT_clear_free(EC_POINT *point);
15 int EC_POINT_copy(EC_POINT *dst, const EC_POINT *src);
16 EC_POINT *EC_POINT_dup(const EC_POINT *src, const EC_GROUP *group);
17 const EC_METHOD *EC_POINT_method_of(const EC_POINT *point);
18 int EC_POINT_set_to_infinity(const EC_GROUP *group, EC_POINT *point);
19 int EC_POINT_set_Jprojective_coordinates_GFp(const EC_GROUP *group, EC_POINT *p,
20 const BIGNUM *x, const BIGNUM *y, const BIGNUM *z, BN_CTX *ctx);
21 int EC_POINT_get_Jprojective_coordinates_GFp(const EC_GROUP *group,
22 const EC_POINT *p, BIGNUM *x, BIGNUM *y, BIGNUM *z, BN_CTX *ctx);
23 int EC_POINT_set_affine_coordinates_GFp(const EC_GROUP *group, EC_POINT *p,
24 const BIGNUM *x, const BIGNUM *y, BN_CTX *ctx);
25 int EC_POINT_get_affine_coordinates_GFp(const EC_GROUP *group,
26 const EC_POINT *p, BIGNUM *x, BIGNUM *y, BN_CTX *ctx);
27 int EC_POINT_set_compressed_coordinates_GFp(const EC_GROUP *group, EC_POINT *p,
28 const BIGNUM *x, int y_bit, BN_CTX *ctx);
29 int EC_POINT_set_affine_coordinates_GF2m(const EC_GROUP *group, EC_POINT *p,
30 const BIGNUM *x, const BIGNUM *y, BN_CTX *ctx);
31 int EC_POINT_get_affine_coordinates_GF2m(const EC_GROUP *group,
32 const EC_POINT *p, BIGNUM *x, BIGNUM *y, BN_CTX *ctx);
33 int EC_POINT_set_compressed_coordinates_GF2m(const EC_GROUP *group, EC_POINT *p,
34 const BIGNUM *x, int y_bit, BN_CTX *ctx);
35 size_t EC_POINT_point2oct(const EC_GROUP *group, const EC_POINT *p,
36 point_conversion_form_t form,
37 unsigned char *buf, size_t len, BN_CTX *ctx);
38 int EC_POINT_oct2point(const EC_GROUP *group, EC_POINT *p,
39 const unsigned char *buf, size_t len, BN_CTX *ctx);
40 BIGNUM *EC_POINT_point2bn(const EC_GROUP *, const EC_POINT *,
41 point_conversion_form_t form, BIGNUM *, BN_CTX *);
42 EC_POINT *EC_POINT_bn2point(const EC_GROUP *, const BIGNUM *,
43 EC_POINT *, BN_CTX *);
44 char *EC_POINT_point2hex(const EC_GROUP *, const EC_POINT *,
45 point_conversion_form_t form, BN_CTX *);
46 EC_POINT *EC_POINT_hex2point(const EC_GROUP *, const char *,
47 EC_POINT *, BN_CTX *);
48
49
50=head1 DESCRIPTION
51
52An EC_POINT represents a point on a curve. A new point is constructed by calling the function EC_POINT_new and providing the B<group>
53object that the point relates to.
54
55EC_POINT_free frees the memory associated with the EC_POINT.
56
57EC_POINT_clear_free destroys any sensitive data held within the EC_POINT and then frees its memory.
58
59EC_POINT_copy copies the point B<src> into B<dst>. Both B<src> and B<dst> must use the same EC_METHOD.
60
61EC_POINT_dup creates a new EC_POINT object and copies the content from B<src> to the newly created
62EC_POINT object.
63
64EC_POINT_method_of obtains the EC_METHOD associated with B<point>.
65
66A 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.
67
68The affine co-ordinates for a point describe a point in terms of its x and y position. The functions
69EC_POINT_set_affine_coordinates_GFp and EC_POINT_set_affine_coordinates_GF2m set the B<x> and B<y> co-ordinates for the point
70B<p> defined over the curve given in B<group>.
71
72As well as the affine co-ordinates, a point can alternatively be described in terms of its Jacobian
73projective co-ordinates (for Fp curves only). Jacobian projective co-ordinates are expressed as three values x, y and z. Working in
74this co-ordinate system provides more efficient point multiplication operations.
75A mapping exists between Jacobian projective co-ordinates and affine co-ordinates. A Jacobian projective co-ordinate (x, y, z) can be written as an affine co-ordinate as (x/(z^2), y/(z^3)). Conversion to Jacobian projective to affine co-ordinates is simple. The co-ordinate (x, y) is
76mapped to (x, y, 1). To set or get the projective co-ordinates use EC_POINT_set_Jprojective_coordinates_GFp and
77EC_POINT_get_Jprojective_coordinates_GFp respectively.
78
79Points 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
80on 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
81and EC_POINT_set_compressed_coordinates_GF2m functions where B<x> is the x co-ordinate and B<y_bit> is a value 0 or 1 to identify which of
82the two possible values for y should be used.
83
84In addition EC_POINTs can be converted to and from various external representations. Supported representations are octet strings, BIGNUMs and hexadecimal. The format of the external representation is described by the point_conversion_form. See L<EC_GROUP_copy(3)|EC_GROUP_copy(3)> for
85a description of point_conversion_form. Octet strings are stored in a buffer along with an associated buffer length. A point held in a BIGNUM is calculated by converting the point to an octet string and then converting that octet string into a BIGNUM integer. Points in hexadecimal format are stored in a NULL terminated character string where each character is one of the printable values 0-9 or A-F (or a-f).
86
87The functions EC_POINT_point2oct, EC_POINT_oct2point, EC_POINT_point2bn, EC_POINT_bn2point, EC_POINT_point2hex and EC_POINT_hex2point convert
88from and to EC_POINTs for the formats: octet string, BIGNUM and hexadecimal respectively.
89
90The function EC_POINT_point2oct must be supplied with a buffer long enough to store the octet string. The return value provides the number of
91octets stored. Calling the function with a NULL buffer will not perform the conversion but will still return the required buffer length.
92
93The function EC_POINT_point2hex will allocate sufficient memory to store the hexadecimal string. It is the caller's responsibility to free
94this memory with a subsequent call to free().
95
96=head1 RETURN VALUES
97
98EC_POINT_new and EC_POINT_dup return the newly allocated EC_POINT or NULL on error.
99
100The following functions return 1 on success or 0 on error: EC_POINT_copy, EC_POINT_set_to_infinity, EC_POINT_set_Jprojective_coordinates_GFp,
101EC_POINT_get_Jprojective_coordinates_GFp, EC_POINT_set_affine_coordinates_GFp, EC_POINT_get_affine_coordinates_GFp,
102EC_POINT_set_compressed_coordinates_GFp, EC_POINT_set_affine_coordinates_GF2m, EC_POINT_get_affine_coordinates_GF2m,
103EC_POINT_set_compressed_coordinates_GF2m and EC_POINT_oct2point.
104
105EC_POINT_method_of returns the EC_METHOD associated with the supplied EC_POINT.
106
107EC_POINT_point2oct returns the length of the required buffer, or 0 on error.
108
109EC_POINT_point2bn returns the pointer to the BIGNUM supplied, or NULL on error.
110
111EC_POINT_bn2point returns the pointer to the EC_POINT supplied, or NULL on error.
112
113EC_POINT_point2hex returns a pointer to the hex string, or NULL on error.
114
115EC_POINT_hex2point returns the pointer to the EC_POINT supplied, or NULL on error.
116
117=head1 SEE ALSO
118
119L<crypto(3)|crypto(3)>, L<ec(3)|ec(3)>, L<EC_GROUP_new(3)|EC_GROUP_new(3)>, L<EC_GROUP_copy(3)|EC_GROUP_copy(3)>,
120L<EC_POINT_add(3)|EC_POINT_add(3)>, L<EC_KEY_new(3)|EC_KEY_new(3)>,
121L<EC_GFp_simple_method(3)|EC_GFp_simple_method(3)>, L<d2i_ECPKParameters(3)|d2i_ECPKParameters(3)>
122
123=cut