1 /* crypto/ec/ecp_mont.c */
2 /* ====================================================================
3 * Copyright (c) 1998-2001 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).
56 #include <openssl/err.h>
61 const EC_METHOD *EC_GFp_mont_method(void)
63 static const EC_METHOD ret = {
64 NID_X9_62_prime_field,
65 ec_GFp_mont_group_init,
66 ec_GFp_mont_group_finish,
67 ec_GFp_mont_group_clear_finish,
68 ec_GFp_mont_group_copy,
69 ec_GFp_mont_group_set_curve_GFp,
70 ec_GFp_simple_group_get_curve_GFp,
71 ec_GFp_simple_group_check_discriminant,
72 ec_GFp_simple_point_init,
73 ec_GFp_simple_point_finish,
74 ec_GFp_simple_point_clear_finish,
75 ec_GFp_simple_point_copy,
76 ec_GFp_simple_point_set_to_infinity,
77 ec_GFp_simple_set_Jprojective_coordinates_GFp,
78 ec_GFp_simple_get_Jprojective_coordinates_GFp,
79 ec_GFp_simple_point_set_affine_coordinates_GFp,
80 ec_GFp_simple_point_get_affine_coordinates_GFp,
81 ec_GFp_simple_set_compressed_coordinates_GFp,
82 ec_GFp_simple_point2oct,
83 ec_GFp_simple_oct2point,
87 ec_GFp_simple_is_at_infinity,
88 ec_GFp_simple_is_on_curve,
90 ec_GFp_simple_make_affine,
91 ec_GFp_simple_points_make_affine,
92 ec_GFp_mont_field_mul,
93 ec_GFp_mont_field_sqr,
94 ec_GFp_mont_field_encode,
95 ec_GFp_mont_field_decode,
96 ec_GFp_mont_field_set_to_one };
102 int ec_GFp_mont_group_init(EC_GROUP *group)
106 ok = ec_GFp_simple_group_init(group);
107 group->field_data1 = NULL;
108 group->field_data2 = NULL;
113 int ec_GFp_mont_group_set_curve_GFp(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
115 BN_CTX *new_ctx = NULL;
116 BN_MONT_CTX *mont = NULL;
120 if (group->field_data1 != NULL)
122 BN_MONT_CTX_free(group->field_data1);
123 group->field_data1 = NULL;
125 if (group->field_data2 != NULL)
127 BN_free(group->field_data2);
128 group->field_data2 = NULL;
133 ctx = new_ctx = BN_CTX_new();
138 mont = BN_MONT_CTX_new();
139 if (mont == NULL) goto err;
140 if (!BN_MONT_CTX_set(mont, p, ctx))
142 ECerr(EC_F_GFP_MONT_GROUP_SET_CURVE_GFP, ERR_R_BN_LIB);
146 if (one == NULL) goto err;
147 if (!BN_to_montgomery(one, BN_value_one(), mont, ctx)) goto err;
149 group->field_data1 = mont;
151 group->field_data2 = one;
154 ret = ec_GFp_simple_group_set_curve_GFp(group, p, a, b, ctx);
158 BN_MONT_CTX_free(group->field_data1);
159 group->field_data1 = NULL;
160 BN_free(group->field_data2);
161 group->field_data2 = NULL;
166 BN_CTX_free(new_ctx);
168 BN_MONT_CTX_free(mont);
173 void ec_GFp_mont_group_finish(EC_GROUP *group)
175 if (group->field_data1 != NULL)
177 BN_MONT_CTX_free(group->field_data1);
178 group->field_data1 = NULL;
180 if (group->field_data2 != NULL)
182 BN_free(group->field_data2);
183 group->field_data2 = NULL;
185 ec_GFp_simple_group_finish(group);
189 void ec_GFp_mont_group_clear_finish(EC_GROUP *group)
191 if (group->field_data1 != NULL)
193 BN_MONT_CTX_free(group->field_data1);
194 group->field_data1 = NULL;
196 if (group->field_data2 != NULL)
198 BN_clear_free(group->field_data2);
199 group->field_data2 = NULL;
201 ec_GFp_simple_group_clear_finish(group);
205 int ec_GFp_mont_group_copy(EC_GROUP *dest, const EC_GROUP *src)
207 if (dest->field_data1 != NULL)
209 BN_MONT_CTX_free(dest->field_data1);
210 dest->field_data1 = NULL;
212 if (dest->field_data2 != NULL)
214 BN_clear_free(dest->field_data2);
215 dest->field_data2 = NULL;
218 if (!ec_GFp_simple_group_copy(dest, src)) return 0;
220 if (src->field_data1 != NULL)
222 dest->field_data1 = BN_MONT_CTX_new();
223 if (dest->field_data1 == NULL) return 0;
224 if (!BN_MONT_CTX_copy(dest->field_data1, src->field_data1)) goto err;
226 if (src->field_data2 != NULL)
228 dest->field_data2 = BN_dup(src->field_data2);
229 if (dest->field_data2 == NULL) goto err;
235 if (dest->field_data1 != NULL)
237 BN_MONT_CTX_free(dest->field_data1);
238 dest->field_data1 = NULL;
244 int ec_GFp_mont_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
246 if (group->field_data1 == NULL)
248 ECerr(EC_F_EC_GFP_MONT_FIELD_MUL, EC_R_NOT_INITIALIZED);
252 return BN_mod_mul_montgomery(r, a, b, group->field_data1, ctx);
256 int ec_GFp_mont_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
258 if (group->field_data1 == NULL)
260 ECerr(EC_F_EC_GFP_MONT_FIELD_SQR, EC_R_NOT_INITIALIZED);
264 return BN_mod_mul_montgomery(r, a, a, group->field_data1, ctx);
268 int ec_GFp_mont_field_encode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
270 if (group->field_data1 == NULL)
272 ECerr(EC_F_EC_GFP_MONT_FIELD_ENCODE, EC_R_NOT_INITIALIZED);
276 return BN_to_montgomery(r, a, (BN_MONT_CTX *)group->field_data1, ctx);
280 int ec_GFp_mont_field_decode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
282 if (group->field_data1 == NULL)
284 ECerr(EC_F_EC_GFP_MONT_FIELD_DECODE, EC_R_NOT_INITIALIZED);
288 return BN_from_montgomery(r, a, group->field_data1, ctx);
292 int ec_GFp_mont_field_set_to_one(const EC_GROUP *group, BIGNUM *r, BN_CTX *ctx)
294 if (group->field_data2 == NULL)
296 ECerr(EC_F_EC_GFP_MONT_FIELD_DECODE, EC_R_NOT_INITIALIZED);
300 if (!BN_copy(r, group->field_data2)) return 0;