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1 | .\" $OpenBSD: EC_GFp_simple_method.3,v 1.12 2023/04/27 08:47:04 tb Exp $ | ||
2 | .\" OpenSSL b97fdb57 Nov 11 09:33:09 2016 +0100 | ||
3 | .\" | ||
4 | .\" This file was written by Matt Caswell <matt@openssl.org>. | ||
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51 | .Dd $Mdocdate: April 27 2023 $ | ||
52 | .Dt EC_GFP_SIMPLE_METHOD 3 | ||
53 | .Os | ||
54 | .Sh NAME | ||
55 | .Nm EC_GFp_simple_method , | ||
56 | .Nm EC_GFp_mont_method , | ||
57 | .Nm EC_METHOD_get_field_type | ||
58 | .Nd obtain EC_METHOD objects | ||
59 | .Sh SYNOPSIS | ||
60 | .In openssl/ec.h | ||
61 | .Ft const EC_METHOD * | ||
62 | .Fn EC_GFp_simple_method void | ||
63 | .Ft const EC_METHOD * | ||
64 | .Fn EC_GFp_mont_method void | ||
65 | .Ft int | ||
66 | .Fo EC_METHOD_get_field_type | ||
67 | .Fa "const EC_METHOD *meth" | ||
68 | .Fc | ||
69 | .Sh DESCRIPTION | ||
70 | The elliptic curve library provides a number of different | ||
71 | implementations through a single common interface. | ||
72 | Each implementation is optimised for different scenarios. | ||
73 | An implementation is represented by an | ||
74 | .Vt EC_METHOD | ||
75 | structure. | ||
76 | .Pp | ||
77 | When constructing a curve using | ||
78 | .Xr EC_GROUP_new 3 , | ||
79 | an implementation method must be provided. | ||
80 | The functions described here all return a const pointer to an | ||
81 | .Sy EC_METHOD | ||
82 | structure that can be passed to | ||
83 | .Xr EC_GROUP_new 3 . | ||
84 | It is important that the correct implementation type for the form | ||
85 | of curve selected is used. | ||
86 | .Pp | ||
87 | For Fp curves the lowest common denominator implementation is the | ||
88 | .Fn EC_GFp_simple_method | ||
89 | implementation. | ||
90 | All other implementations are based on this one. | ||
91 | .Fn EC_GFp_mont_method | ||
92 | adds the use of Montgomery multiplication (see | ||
93 | .Xr BN_mod_mul_montgomery 3 ) . | ||
94 | .Pp | ||
95 | .Fn EC_METHOD_get_field_type | ||
96 | identifies what type of field the | ||
97 | .Vt EC_METHOD | ||
98 | structure supports. | ||
99 | If the field type is Fp, then the value | ||
100 | .Dv NID_X9_62_prime_field | ||
101 | is returned. | ||
102 | If the field type is F2^m, then the value | ||
103 | .Dv NID_X9_62_characteristic_two_field | ||
104 | is returned. | ||
105 | These values are defined in the | ||
106 | .In openssl/objects.h | ||
107 | header file. | ||
108 | .Sh RETURN VALUES | ||
109 | All | ||
110 | .Fn EC_GFp* | ||
111 | functions always return a const pointer to an | ||
112 | .Vt EC_METHOD | ||
113 | structure. | ||
114 | .Pp | ||
115 | .Fn EC_METHOD_get_field_type | ||
116 | returns an integer that identifies the type of field the | ||
117 | .Vt EC_METHOD | ||
118 | structure supports. | ||
119 | .Sh SEE ALSO | ||
120 | .Xr BN_mod_mul_montgomery 3 , | ||
121 | .Xr d2i_ECPKParameters 3 , | ||
122 | .Xr EC_GROUP_copy 3 , | ||
123 | .Xr EC_GROUP_new 3 , | ||
124 | .Xr EC_KEY_new 3 , | ||
125 | .Xr EC_POINT_add 3 , | ||
126 | .Xr EC_POINT_new 3 | ||
127 | .Sh HISTORY | ||
128 | .Fn EC_GFp_simple_method | ||
129 | and | ||
130 | .Fn EC_GFp_mont_method | ||
131 | first appeared in OpenSSL 0.9.7 and have been available since | ||
132 | .Ox 3.2 . | ||
133 | .Pp | ||
134 | .Fn EC_METHOD_get_field_type | ||
135 | first appeared in OpenSSL 0.9.8 and has been available since | ||
136 | .Ox 4.5 . | ||