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1 : : /* crypto/ec/ec_cvt.c */
2 : : /*
3 : : * Originally written by Bodo Moeller for the OpenSSL project.
4 : : */
5 : : /* ====================================================================
6 : : * Copyright (c) 1998-2002 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 : : *
61 : : * Portions of the attached software ("Contribution") are developed by
62 : : * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
63 : : *
64 : : * The Contribution is licensed pursuant to the OpenSSL open source
65 : : * license provided above.
66 : : *
67 : : * The elliptic curve binary polynomial software is originally written by
68 : : * Sheueling Chang Shantz and Douglas Stebila of Sun Microsystems Laboratories.
69 : : *
70 : : */
71 : :
72 : : #define OPENSSL_FIPSAPI
73 : :
74 : : #include <openssl/err.h>
75 : : #include "ec_lcl.h"
76 : :
77 : :
78 : 133 : EC_GROUP *EC_GROUP_new_curve_GFp(const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
79 : : {
80 : : const EC_METHOD *meth;
81 : : EC_GROUP *ret;
82 : :
83 : : #if defined(OPENSSL_BN_ASM_MONT)
84 : : /*
85 : : * This might appear controversial, but the fact is that generic
86 : : * prime method was observed to deliver better performance even
87 : : * for NIST primes on a range of platforms, e.g.: 60%-15%
88 : : * improvement on IA-64, ~25% on ARM, 30%-90% on P4, 20%-25%
89 : : * in 32-bit build and 35%--12% in 64-bit build on Core2...
90 : : * Coefficients are relative to optimized bn_nist.c for most
91 : : * intensive ECDSA verify and ECDH operations for 192- and 521-
92 : : * bit keys respectively. Choice of these boundary values is
93 : : * arguable, because the dependency of improvement coefficient
94 : : * from key length is not a "monotone" curve. For example while
95 : : * 571-bit result is 23% on ARM, 384-bit one is -1%. But it's
96 : : * generally faster, sometimes "respectfully" faster, sometimes
97 : : * "tolerably" slower... What effectively happens is that loop
98 : : * with bn_mul_add_words is put against bn_mul_mont, and the
99 : : * latter "wins" on short vectors. Correct solution should be
100 : : * implementing dedicated NxN multiplication subroutines for
101 : : * small N. But till it materializes, let's stick to generic
102 : : * prime method...
103 : : * <appro>
104 : : */
105 : 133 : meth = EC_GFp_mont_method();
106 : : #else
107 : : if (BN_nist_mod_func(p))
108 : : meth = EC_GFp_nist_method();
109 : : else
110 : : meth = EC_GFp_mont_method();
111 : : #endif
112 : :
113 : 133 : ret = EC_GROUP_new(meth);
114 [ + - ]: 133 : if (ret == NULL)
115 : : return NULL;
116 : :
117 [ - + ]: 133 : if (!EC_GROUP_set_curve_GFp(ret, p, a, b, ctx))
118 : : {
119 : 0 : EC_GROUP_clear_free(ret);
120 : 0 : return NULL;
121 : : }
122 : :
123 : : return ret;
124 : : }
125 : :
126 : : #ifndef OPENSSL_NO_EC2M
127 : 1474 : EC_GROUP *EC_GROUP_new_curve_GF2m(const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
128 : : {
129 : : const EC_METHOD *meth;
130 : : EC_GROUP *ret;
131 : :
132 : 1474 : meth = EC_GF2m_simple_method();
133 : :
134 : 1474 : ret = EC_GROUP_new(meth);
135 [ + - ]: 1474 : if (ret == NULL)
136 : : return NULL;
137 : :
138 [ - + ]: 1474 : if (!EC_GROUP_set_curve_GF2m(ret, p, a, b, ctx))
139 : : {
140 : 0 : EC_GROUP_clear_free(ret);
141 : 0 : return NULL;
142 : : }
143 : :
144 : : return ret;
145 : : }
146 : : #endif
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