1 /* crypto/ec/ecp_nist.c */
3 * Written by Nils Larsch for the OpenSSL project.
5 /* ====================================================================
6 * Copyright (c) 1998-2003 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
34 * 6. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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 * ====================================================================
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).
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.
66 #include <openssl/err.h>
67 #include <openssl/obj_mac.h>
70 const EC_METHOD
*EC_GFp_nist_method(void)
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
,
97 ec_GFp_simple_is_at_infinity
,
98 ec_GFp_simple_is_on_curve
,
100 ec_GFp_simple_make_affine
,
101 ec_GFp_simple_points_make_affine
,
103 0 /* precompute_mult */,
104 0 /* have_precompute_mult */,
105 ec_GFp_nist_field_mul
,
106 ec_GFp_nist_field_sqr
,
108 0 /* field_encode */,
109 0 /* field_decode */,
110 0 /* field_set_to_one */ };
115 #if BN_BITS2 == 64 && UINT_MAX != 4294967295UL && ULONG_MAX != 4294967295UL
116 #define NO_32_BIT_TYPE
119 int ec_GFp_nist_group_copy(EC_GROUP
*dest
, const EC_GROUP
*src
)
121 dest
->field_mod_func
= src
->field_mod_func
;
123 return ec_GFp_simple_group_copy(dest
, src
);
126 int ec_GFp_nist_group_set_curve(EC_GROUP
*group
, const BIGNUM
*p
,
127 const BIGNUM
*a
, const BIGNUM
*b
, BN_CTX
*ctx
)
130 BN_CTX
*new_ctx
= NULL
;
134 if ((ctx
= new_ctx
= BN_CTX_new()) == NULL
) return 0;
137 if ((tmp_bn
= BN_CTX_get(ctx
)) == NULL
) goto err
;
139 if (BN_ucmp(BN_get0_nist_prime_192(), p
) == 0)
140 group
->field_mod_func
= BN_nist_mod_192
;
141 else if (BN_ucmp(BN_get0_nist_prime_224(), p
) == 0)
143 #if !defined(NO_32_BIT_TYPE) || defined(OPENSSL_NO_ASM)
144 group
->field_mod_func
= BN_nist_mod_224
;
146 ECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE
, EC_R_NOT_A_SUPPORTED_NIST_PRIME
);
150 else if (BN_ucmp(BN_get0_nist_prime_256(), p
) == 0)
152 #if !defined(NO_32_BIT_TYPE) || defined(OPENSSL_NO_ASM)
153 group
->field_mod_func
= BN_nist_mod_256
;
155 ECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE
, EC_R_NOT_A_SUPPORTED_NIST_PRIME
);
159 else if (BN_ucmp(BN_get0_nist_prime_384(), p
) == 0)
161 #if !defined(NO_32_BIT_TYPE) || defined(OPENSSL_NO_ASM)
162 group
->field_mod_func
= BN_nist_mod_384
;
164 ECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE
, EC_R_NOT_A_SUPPORTED_NIST_PRIME
);
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
;
173 ECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE
, EC_R_NOT_A_NIST_PRIME
);
177 ret
= ec_GFp_simple_group_set_curve(group
, p
, a
, b
, ctx
);
182 BN_CTX_free(new_ctx
);
187 int ec_GFp_nist_field_mul(const EC_GROUP
*group
, BIGNUM
*r
, const BIGNUM
*a
,
188 const BIGNUM
*b
, BN_CTX
*ctx
)
191 BN_CTX
*ctx_new
=NULL
;
193 if (!group
|| !r
|| !a
|| !b
)
195 ECerr(EC_F_EC_GFP_NIST_FIELD_MUL
, ERR_R_PASSED_NULL_PARAMETER
);
199 if ((ctx_new
= ctx
= BN_CTX_new()) == NULL
) goto err
;
201 if (!BN_mul(r
, a
, b
, ctx
)) goto err
;
202 if (!group
->field_mod_func(r
, r
, &group
->field
, ctx
))
208 BN_CTX_free(ctx_new
);
213 int ec_GFp_nist_field_sqr(const EC_GROUP
*group
, BIGNUM
*r
, const BIGNUM
*a
,
217 BN_CTX
*ctx_new
=NULL
;
219 if (!group
|| !r
|| !a
)
221 ECerr(EC_F_EC_GFP_NIST_FIELD_SQR
, EC_R_PASSED_NULL_PARAMETER
);
225 if ((ctx_new
= ctx
= BN_CTX_new()) == NULL
) goto err
;
227 if (!BN_sqr(r
, a
, ctx
)) goto err
;
228 if (!group
->field_mod_func(r
, r
, &group
->field
, ctx
))
234 BN_CTX_free(ctx_new
);