1 /* Originally written by Bodo Moeller for the OpenSSL project.
2 * ====================================================================
3 * Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in
14 * the documentation and/or other materials provided with the
17 * 3. All advertising materials mentioning features or use of this
18 * software must display the following acknowledgment:
19 * "This product includes software developed by the OpenSSL Project
20 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
22 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
23 * endorse or promote products derived from this software without
24 * prior written permission. For written permission, please contact
25 * openssl-core@openssl.org.
27 * 5. Products derived from this software may not be called "OpenSSL"
28 * nor may "OpenSSL" appear in their names without prior written
29 * permission of the OpenSSL Project.
31 * 6. Redistributions of any form whatsoever must retain the following
33 * "This product includes software developed by the OpenSSL Project
34 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
36 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
37 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
38 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
39 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
40 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
41 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
42 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
43 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
44 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
45 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
46 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
47 * OF THE POSSIBILITY OF SUCH DAMAGE.
48 * ====================================================================
50 * This product includes cryptographic software written by Eric Young
51 * (eay@cryptsoft.com). This product includes software written by Tim
52 * Hudson (tjh@cryptsoft.com).
55 /* ====================================================================
56 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
58 * Portions of the attached software ("Contribution") are developed by
59 * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
61 * The Contribution is licensed pursuant to the OpenSSL open source
62 * license provided above.
64 * The elliptic curve binary polynomial software is originally written by
65 * Sheueling Chang Shantz and Douglas Stebila of Sun Microsystems
68 #ifndef OPENSSL_HEADER_EC_H
69 #define OPENSSL_HEADER_EC_H
71 #include <openssl/base.h>
73 #if defined(__cplusplus)
78 typedef struct ec_group_st EC_GROUP;
79 typedef struct ec_point_st EC_POINT;
81 /** Enum for the point conversion form as defined in X9.62 (ECDSA)
82 * for the encoding of a elliptic curve point (x,y) */
84 /** the point is encoded as z||x, where the octet z specifies
85 * which solution of the quadratic equation y is */
86 POINT_CONVERSION_COMPRESSED = 2,
87 /** the point is encoded as z||x||y, where z is the octet 0x02 */
88 POINT_CONVERSION_UNCOMPRESSED = 4,
89 /** the point is encoded as z||x||y, where the octet z specifies
90 * which solution of the quadratic equation y is */
91 POINT_CONVERSION_HYBRID = 6
92 } point_conversion_form_t;
95 /* Elliptic curve groups. */
97 /* EC_GROUP_new_by_curve_name returns a fresh EC_GROUP object for the elliptic
98 * curve specified by |nid|, or NULL on error.
100 * The supported NIDs are:
102 * NID_X9_62_prime256v1,
105 OPENSSL_EXPORT EC_GROUP *EC_GROUP_new_by_curve_name(int nid);
107 /* EC_GROUP_free frees |group| and the data that it points to. */
108 OPENSSL_EXPORT void EC_GROUP_free(EC_GROUP *group);
110 /* EC_GROUP_copy sets |*dest| equal to |*src|. It returns one on success and
112 OPENSSL_EXPORT int EC_GROUP_copy(EC_GROUP *dest, const EC_GROUP *src);
114 /* EC_GROUP_dup returns a fresh |EC_GROUP| which is equal to |a| or NULL on
116 OPENSSL_EXPORT EC_GROUP *EC_GROUP_dup(const EC_GROUP *a);
118 /* EC_GROUP_cmp returns one if |a| and |b| are the same group and zero
120 OPENSSL_EXPORT int EC_GROUP_cmp(const EC_GROUP *a, const EC_GROUP *b);
122 /* EC_GROUP_get0_generator returns a pointer to the internal |EC_POINT| object
123 * in |group| that specifies the generator for the group. */
124 OPENSSL_EXPORT const EC_POINT *EC_GROUP_get0_generator(const EC_GROUP *group);
126 /* EC_GROUP_get_order sets |*order| to the order of |group| using |ctx|, if
127 * it's not NULL. It returns one on success and zero otherwise. */
128 OPENSSL_EXPORT int EC_GROUP_get_order(const EC_GROUP *group, BIGNUM *order,
131 /* EC_GROUP_get_cofactor sets |*cofactor| to the cofactor of |group| using
132 * |ctx|, if it's not NULL. It returns one on success and zero otherwise. */
133 OPENSSL_EXPORT int EC_GROUP_get_cofactor(const EC_GROUP *group,
134 BIGNUM *cofactor, BN_CTX *ctx);
136 /* EC_GROUP_get_curve_GFp gets various parameters about a group. It sets
137 * |*out_p| to the order of the coordinate field and |*out_a| and |*out_b| to
138 * the parameters of the curve when expressed as y² = x³ + ax + b. Any of the
139 * output parameters can be NULL. It returns one on success and zero on
141 OPENSSL_EXPORT int EC_GROUP_get_curve_GFp(const EC_GROUP *group, BIGNUM *out_p,
142 BIGNUM *out_a, BIGNUM *out_b,
145 /* EC_GROUP_get_curve_name returns a NID that identifies |group|. */
146 OPENSSL_EXPORT int EC_GROUP_get_curve_name(const EC_GROUP *group);
148 /* EC_GROUP_get_degree returns the number of bits needed to represent an
149 * element of the field underlying |group|. */
150 OPENSSL_EXPORT int EC_GROUP_get_degree(const EC_GROUP *group);
152 /* EC_GROUP_set_point_conversion_form sets the form that serialised points will
153 * take as one of the |POINT_CONVERSION_*| values. */
154 OPENSSL_EXPORT void EC_GROUP_set_point_conversion_form(
155 EC_GROUP *group, point_conversion_form_t form);
157 /* EC_GROUP_precompute_mult precomputes multiplies of the generator in order to
158 * speed up operations that involve calculating generator multiples. It returns
159 * one on sucess and zero otherwise. If |ctx| is not NULL, it may be used. */
160 OPENSSL_EXPORT int EC_GROUP_precompute_mult(EC_GROUP *group, BN_CTX *ctx);
162 /* EC_GROUP_have_precompute_mult returns one if |group| contains precomputed
163 * generator multiples. */
164 OPENSSL_EXPORT int EC_GROUP_have_precompute_mult(const EC_GROUP *group);
167 /* Points on elliptic curves. */
169 /* EC_POINT_new returns a fresh |EC_POINT| object in the given group, or NULL
171 OPENSSL_EXPORT EC_POINT *EC_POINT_new(const EC_GROUP *group);
173 /* EC_POINT_free frees |point| and the data that it points to. */
174 OPENSSL_EXPORT void EC_POINT_free(EC_POINT *point);
176 /* EC_POINT_clear_free clears the data that |point| points to, frees it and
177 * then frees |point| itself. */
178 OPENSSL_EXPORT void EC_POINT_clear_free(EC_POINT *point);
180 /* EC_POINT_copy sets |*dest| equal to |*src|. It returns one on success and
182 OPENSSL_EXPORT int EC_POINT_copy(EC_POINT *dest, const EC_POINT *src);
184 /* EC_POINT_dup returns a fresh |EC_POINT| that contains the same values as
185 * |src|, or NULL on error. */
186 OPENSSL_EXPORT EC_POINT *EC_POINT_dup(const EC_POINT *src,
187 const EC_GROUP *group);
189 /* EC_POINT_set_to_infinity sets |point| to be the "point at infinity" for the
191 OPENSSL_EXPORT int EC_POINT_set_to_infinity(const EC_GROUP *group,
194 /* EC_POINT_is_at_infinity returns one iff |point| is the point at infinity and
196 OPENSSL_EXPORT int EC_POINT_is_at_infinity(const EC_GROUP *group,
197 const EC_POINT *point);
199 /* EC_POINT_is_on_curve returns one if |point| is an element of |group| and
200 * zero otheriwse. If |ctx| is non-NULL, it may be used. */
201 OPENSSL_EXPORT int EC_POINT_is_on_curve(const EC_GROUP *group,
202 const EC_POINT *point, BN_CTX *ctx);
204 /* EC_POINT_cmp returns zero if |a| is equal to |b|, greater than zero is
205 * non-equal and -1 on error. If |ctx| is not NULL, it may be used. */
206 OPENSSL_EXPORT int EC_POINT_cmp(const EC_GROUP *group, const EC_POINT *a,
207 const EC_POINT *b, BN_CTX *ctx);
209 /* EC_POINT_make_affine converts |point| to affine form, internally. It returns
210 * one on success and zero otherwise. If |ctx| is not NULL, it may be used. */
211 OPENSSL_EXPORT int EC_POINT_make_affine(const EC_GROUP *group, EC_POINT *point,
214 /* EC_POINTs_make_affine converts |num| points from |points| to affine form,
215 * internally. It returns one on success and zero otherwise. If |ctx| is not
216 * NULL, it may be used. */
217 OPENSSL_EXPORT int EC_POINTs_make_affine(const EC_GROUP *group, size_t num,
218 EC_POINT *points[], BN_CTX *ctx);
221 /* Point conversion. */
223 /* EC_POINT_get_affine_coordinates_GFp sets |x| and |y| to the affine value of
224 * |point| using |ctx|, if it's not NULL. It returns one on success and zero
226 OPENSSL_EXPORT int EC_POINT_get_affine_coordinates_GFp(const EC_GROUP *group,
227 const EC_POINT *point,
228 BIGNUM *x, BIGNUM *y,
231 /* EC_POINT_set_affine_coordinates sets the value of |p| to be (|x|, |y|). The
232 * |ctx| argument may be used if not NULL. */
233 OPENSSL_EXPORT int EC_POINT_set_affine_coordinates_GFp(const EC_GROUP *group,
239 /* EC_POINT_point2oct serialises |point| into the X9.62 form given by |form|
240 * into, at most, |len| bytes at |buf|. It returns the number of bytes written
241 * or zero on error if |buf| is non-NULL, else the number of bytes needed. The
242 * |ctx| argument may be used if not NULL. */
243 OPENSSL_EXPORT size_t EC_POINT_point2oct(const EC_GROUP *group,
244 const EC_POINT *point,
245 point_conversion_form_t form,
246 uint8_t *buf, size_t len, BN_CTX *ctx);
248 /* EC_POINT_oct2point sets |point| from |len| bytes of X9.62 format
249 * serialisation in |buf|. It returns one on success and zero otherwise. The
250 * |ctx| argument may be used if not NULL. */
251 OPENSSL_EXPORT int EC_POINT_oct2point(const EC_GROUP *group, EC_POINT *point,
252 const uint8_t *buf, size_t len,
255 /* EC_POINT_set_compressed_coordinates_GFp sets |point| to equal the point with
256 * the given |x| coordinate and the y coordinate specified by |y_bit| (see
257 * X9.62). It returns one on success and zero otherwise. */
258 OPENSSL_EXPORT int EC_POINT_set_compressed_coordinates_GFp(
259 const EC_GROUP *group, EC_POINT *point, const BIGNUM *x, int y_bit,
263 /* Group operations. */
265 /* EC_POINT_add sets |r| equal to |a| plus |b|. It returns one on success and
266 * zero otherwise. If |ctx| is not NULL, it may be used. */
267 OPENSSL_EXPORT int EC_POINT_add(const EC_GROUP *group, EC_POINT *r,
268 const EC_POINT *a, const EC_POINT *b,
271 /* EC_POINT_dbl sets |r| equal to |a| plus |a|. It returns one on success and
272 * zero otherwise. If |ctx| is not NULL, it may be used. */
273 OPENSSL_EXPORT int EC_POINT_dbl(const EC_GROUP *group, EC_POINT *r,
274 const EC_POINT *a, BN_CTX *ctx);
276 /* EC_POINT_dbl sets |a| equal to minus |a|. It returns one on success and zero
277 * otherwise. If |ctx| is not NULL, it may be used. */
278 OPENSSL_EXPORT int EC_POINT_invert(const EC_GROUP *group, EC_POINT *a,
281 /* EC_POINT_mul sets r = generator*n + q*m. It returns one on success and zero
282 * otherwise. If |ctx| is not NULL, it may be used. */
283 OPENSSL_EXPORT int EC_POINT_mul(const EC_GROUP *group, EC_POINT *r,
284 const BIGNUM *n, const EC_POINT *q,
285 const BIGNUM *m, BN_CTX *ctx);
287 /* EC_POINTs_mul sets r = generator*n + sum(p[i]*m[i]). It returns one on
288 * success and zero otherwise. If |ctx| is not NULL, it may be used. */
289 OPENSSL_EXPORT int EC_POINTs_mul(const EC_GROUP *group, EC_POINT *r,
290 const BIGNUM *n, size_t num,
291 const EC_POINT *p[], const BIGNUM *m[],
295 /* Old code expects to get EC_KEY from ec.h. */
296 #if !defined(OPENSSL_HEADER_EC_KEY_H)
297 #include <openssl/ec_key.h>
301 #if defined(__cplusplus)
305 #define EC_F_ec_pre_comp_new 100
306 #define EC_F_ec_GFp_mont_field_decode 101
307 #define EC_F_ec_group_new_from_data 102
308 #define EC_F_ec_GFp_simple_point_get_affine_coordinates 103
309 #define EC_F_ec_GFp_simple_make_affine 104
310 #define EC_F_EC_KEY_new_method 105
311 #define EC_F_ec_GFp_mont_field_encode 106
312 #define EC_F_EC_GROUP_new_by_curve_name 107
313 #define EC_F_ec_group_new 108
314 #define EC_F_ec_asn1_group2pkparameters 109
315 #define EC_F_EC_POINT_set_compressed_coordinates_GFp 110
316 #define EC_F_ec_GFp_mont_field_sqr 111
317 #define EC_F_EC_POINT_make_affine 112
318 #define EC_F_i2d_ECParameters 113
319 #define EC_F_ec_wNAF_mul 114
320 #define EC_F_EC_GROUP_copy 115
321 #define EC_F_EC_POINT_cmp 116
322 #define EC_F_ec_GFp_mont_field_mul 117
323 #define EC_F_EC_POINT_dup 118
324 #define EC_F_EC_POINT_invert 119
325 #define EC_F_ec_GFp_simple_point_set_affine_coordinates 120
326 #define EC_F_ec_GFp_simple_points_make_affine 121
327 #define EC_F_i2o_ECPublicKey 122
328 #define EC_F_EC_KEY_check_key 123
329 #define EC_F_ec_wNAF_precompute_mult 124
330 #define EC_F_EC_POINT_oct2point 125
331 #define EC_F_EC_POINT_is_at_infinity 126
332 #define EC_F_EC_POINT_get_affine_coordinates_GFp 127
333 #define EC_F_ec_point_set_Jprojective_coordinates_GFp 128
334 #define EC_F_o2i_ECPublicKey 129
335 #define EC_F_ec_GFp_mont_field_set_to_one 130
336 #define EC_F_ec_group_new_curve_GFp 131
337 #define EC_F_EC_POINT_dbl 132
338 #define EC_F_ec_asn1_pkparameters2group 133
339 #define EC_F_i2d_ECPKParameters 134
340 #define EC_F_EC_KEY_copy 135
341 #define EC_F_EC_POINT_new 136
342 #define EC_F_EC_POINT_point2oct 137
343 #define EC_F_EC_POINT_copy 138
344 #define EC_F_EC_POINT_is_on_curve 139
345 #define EC_F_ec_GFp_simple_group_set_curve 140
346 #define EC_F_i2d_ECPrivateKey 141
347 #define EC_F_d2i_ECParameters 142
348 #define EC_F_ec_GFp_mont_group_set_curve 143
349 #define EC_F_EC_POINT_set_to_infinity 144
350 #define EC_F_EC_POINTs_make_affine 145
351 #define EC_F_compute_wNAF 146
352 #define EC_F_ec_GFp_simple_point2oct 147
353 #define EC_F_EC_GROUP_get_degree 148
354 #define EC_F_ec_GFp_simple_group_check_discriminant 149
355 #define EC_F_d2i_ECPKParameters 150
356 #define EC_F_d2i_ECPrivateKey 151
357 #define EC_F_ec_GFp_simple_oct2point 152
358 #define EC_F_EC_POINT_set_affine_coordinates_GFp 153
359 #define EC_F_EC_KEY_set_public_key_affine_coordinates 154
360 #define EC_F_EC_KEY_generate_key 155
361 #define EC_F_ec_GFp_simple_set_compressed_coordinates 156
362 #define EC_F_EC_POINT_add 157
363 #define EC_F_EC_GROUP_get_curve_GFp 158
364 #define EC_R_PKPARAMETERS2GROUP_FAILURE 100
365 #define EC_R_NON_NAMED_CURVE 101
366 #define EC_R_COORDINATES_OUT_OF_RANGE 102
367 #define EC_R_POINT_AT_INFINITY 103
368 #define EC_R_NOT_INITIALIZED 104
369 #define EC_R_MISSING_PRIVATE_KEY 105
370 #define EC_R_GROUP2PKPARAMETERS_FAILURE 106
371 #define EC_R_INVALID_ENCODING 107
372 #define EC_R_BUFFER_TOO_SMALL 108
373 #define EC_R_D2I_ECPKPARAMETERS_FAILURE 109
374 #define EC_R_INVALID_FORM 110
375 #define EC_R_INVALID_PRIVATE_KEY 111
376 #define EC_R_INVALID_COMPRESSED_POINT 112
377 #define EC_R_MISSING_PARAMETERS 113
378 #define EC_R_INVALID_FIELD 114
379 #define EC_R_INVALID_COMPRESSION_BIT 115
380 #define EC_R_GF2M_NOT_SUPPORTED 116
381 #define EC_R_POINT_IS_NOT_ON_CURVE 117
382 #define EC_R_UNKNOWN_ORDER 118
383 #define EC_R_UNKNOWN_GROUP 119
384 #define EC_R_WRONG_ORDER 120
385 #define EC_R_UNDEFINED_GENERATOR 121
386 #define EC_R_INCOMPATIBLE_OBJECTS 122
387 #define EC_R_I2D_ECPKPARAMETERS_FAILURE 123
388 #define EC_R_EC_GROUP_NEW_BY_NAME_FAILURE 124
389 #define EC_R_INVALID_GROUP_ORDER 125
390 #define EC_R_SLOT_FULL 126
392 #endif /* OPENSSL_HEADER_EC_H */