ecp_nist.c revision 296465 
1/* crypto/ec/ecp_nist.c */
2/*
3 * Written by Nils Larsch for the OpenSSL project.
4 */
5/* ====================================================================
6 * Copyright (c) 1998-2003 The OpenSSL Project.  All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in
17 *    the documentation and/or other materials provided with the
18 *    distribution.
19 *
20 * 3. All advertising materials mentioning features or use of this
21 *    software must display the following acknowledgment:
22 *    "This product includes software developed by the OpenSSL Project
23 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
24 *
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 *    endorse or promote products derived from this software without
27 *    prior written permission. For written permission, please contact
28 *    openssl-core@openssl.org.
29 *
30 * 5. Products derived from this software may not be called "OpenSSL"
31 *    nor may "OpenSSL" appear in their names without prior written
32 *    permission of the OpenSSL Project.
33 *
34 * 6. Redistributions of any form whatsoever must retain the following
35 *    acknowledgment:
36 *    "This product includes software developed by the OpenSSL Project
37 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
38 *
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
52 *
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com).  This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
56 *
57 */
58/* ====================================================================
59 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
60 * Portions of this software developed by SUN MICROSYSTEMS, INC.,
61 * and contributed to the OpenSSL project.
62 */
63
64#include <limits.h>
65
66#include <openssl/err.h>
67#include <openssl/obj_mac.h>
68#include "ec_lcl.h"
69
70const EC_METHOD *EC_GFp_nist_method(void)
71{
72    static const EC_METHOD ret = {
73        NID_X9_62_prime_field,
74        ec_GFp_simple_group_init,
75        ec_GFp_simple_group_finish,
76        ec_GFp_simple_group_clear_finish,
77        ec_GFp_nist_group_copy,
78        ec_GFp_nist_group_set_curve,
79        ec_GFp_simple_group_get_curve,
80        ec_GFp_simple_group_get_degree,
81        ec_GFp_simple_group_check_discriminant,
82        ec_GFp_simple_point_init,
83        ec_GFp_simple_point_finish,
84        ec_GFp_simple_point_clear_finish,
85        ec_GFp_simple_point_copy,
86        ec_GFp_simple_point_set_to_infinity,
87        ec_GFp_simple_set_Jprojective_coordinates_GFp,
88        ec_GFp_simple_get_Jprojective_coordinates_GFp,
89        ec_GFp_simple_point_set_affine_coordinates,
90        ec_GFp_simple_point_get_affine_coordinates,
91        ec_GFp_simple_set_compressed_coordinates,
92        ec_GFp_simple_point2oct,
93        ec_GFp_simple_oct2point,
94        ec_GFp_simple_add,
95        ec_GFp_simple_dbl,
96        ec_GFp_simple_invert,
97        ec_GFp_simple_is_at_infinity,
98        ec_GFp_simple_is_on_curve,
99        ec_GFp_simple_cmp,
100        ec_GFp_simple_make_affine,
101        ec_GFp_simple_points_make_affine,
102        0 /* mul */ ,
103        0 /* precompute_mult */ ,
104        0 /* have_precompute_mult */ ,
105        ec_GFp_nist_field_mul,
106        ec_GFp_nist_field_sqr,
107        0 /* field_div */ ,
108        0 /* field_encode */ ,
109        0 /* field_decode */ ,
110        0                       /* field_set_to_one */
111    };
112
113    return &ret;
114}
115
116#if BN_BITS2 == 64
117# define NO_32_BIT_TYPE
118#endif
119
120int ec_GFp_nist_group_copy(EC_GROUP *dest, const EC_GROUP *src)
121{
122    dest->field_mod_func = src->field_mod_func;
123
124    return ec_GFp_simple_group_copy(dest, src);
125}
126
127int ec_GFp_nist_group_set_curve(EC_GROUP *group, const BIGNUM *p,
128                                const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
129{
130    int ret = 0;
131    BN_CTX *new_ctx = NULL;
132    BIGNUM *tmp_bn;
133
134    if (ctx == NULL)
135        if ((ctx = new_ctx = BN_CTX_new()) == NULL)
136            return 0;
137
138    BN_CTX_start(ctx);
139    if ((tmp_bn = BN_CTX_get(ctx)) == NULL)
140        goto err;
141
142    if (BN_ucmp(BN_get0_nist_prime_192(), p) == 0)
143        group->field_mod_func = BN_nist_mod_192;
144    else if (BN_ucmp(BN_get0_nist_prime_224(), p) == 0) {
145#ifndef NO_32_BIT_TYPE
146        group->field_mod_func = BN_nist_mod_224;
147#else
148        ECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE,
149              EC_R_NOT_A_SUPPORTED_NIST_PRIME);
150        goto err;
151#endif
152    } else if (BN_ucmp(BN_get0_nist_prime_256(), p) == 0) {
153#ifndef NO_32_BIT_TYPE
154        group->field_mod_func = BN_nist_mod_256;
155#else
156        ECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE,
157              EC_R_NOT_A_SUPPORTED_NIST_PRIME);
158        goto err;
159#endif
160    } else if (BN_ucmp(BN_get0_nist_prime_384(), p) == 0) {
161#ifndef NO_32_BIT_TYPE
162        group->field_mod_func = BN_nist_mod_384;
163#else
164        ECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE,
165              EC_R_NOT_A_SUPPORTED_NIST_PRIME);
166        goto err;
167#endif
168    } else if (BN_ucmp(BN_get0_nist_prime_521(), p) == 0)
169        /* this one works in the NO_32_BIT_TYPE case */
170        group->field_mod_func = BN_nist_mod_521;
171    else {
172        ECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE, EC_R_NOT_A_NIST_PRIME);
173        goto err;
174    }
175
176    ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx);
177
178 err:
179    BN_CTX_end(ctx);
180    if (new_ctx != NULL)
181        BN_CTX_free(new_ctx);
182    return ret;
183}
184
185int ec_GFp_nist_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
186                          const BIGNUM *b, BN_CTX *ctx)
187{
188    int ret = 0;
189    BN_CTX *ctx_new = NULL;
190
191    if (!group || !r || !a || !b) {
192        ECerr(EC_F_EC_GFP_NIST_FIELD_MUL, ERR_R_PASSED_NULL_PARAMETER);
193        goto err;
194    }
195    if (!ctx)
196        if ((ctx_new = ctx = BN_CTX_new()) == NULL)
197            goto err;
198
199    if (!BN_mul(r, a, b, ctx))
200        goto err;
201    if (!group->field_mod_func(r, r, &group->field, ctx))
202        goto err;
203
204    ret = 1;
205 err:
206    if (ctx_new)
207        BN_CTX_free(ctx_new);
208    return ret;
209}
210
211int ec_GFp_nist_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
212                          BN_CTX *ctx)
213{
214    int ret = 0;
215    BN_CTX *ctx_new = NULL;
216
217    if (!group || !r || !a) {
218        ECerr(EC_F_EC_GFP_NIST_FIELD_SQR, EC_R_PASSED_NULL_PARAMETER);
219        goto err;
220    }
221    if (!ctx)
222        if ((ctx_new = ctx = BN_CTX_new()) == NULL)
223            goto err;
224
225    if (!BN_sqr(r, a, ctx))
226        goto err;
227    if (!group->field_mod_func(r, r, &group->field, ctx))
228        goto err;
229
230    ret = 1;
231 err:
232    if (ctx_new)
233        BN_CTX_free(ctx_new);
234    return ret;
235}
236