2 * Copyright 2001-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
10 /* ====================================================================
11 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
12 * Portions of this software developed by SUN MICROSYSTEMS, INC.,
13 * and contributed to the OpenSSL project.
18 #include <openssl/err.h>
19 #include <openssl/obj_mac.h>
22 const EC_METHOD
*EC_GFp_nist_method(void)
24 static const EC_METHOD ret
= {
26 NID_X9_62_prime_field
,
27 ec_GFp_simple_group_init
,
28 ec_GFp_simple_group_finish
,
29 ec_GFp_simple_group_clear_finish
,
30 ec_GFp_nist_group_copy
,
31 ec_GFp_nist_group_set_curve
,
32 ec_GFp_simple_group_get_curve
,
33 ec_GFp_simple_group_get_degree
,
34 ec_group_simple_order_bits
,
35 ec_GFp_simple_group_check_discriminant
,
36 ec_GFp_simple_point_init
,
37 ec_GFp_simple_point_finish
,
38 ec_GFp_simple_point_clear_finish
,
39 ec_GFp_simple_point_copy
,
40 ec_GFp_simple_point_set_to_infinity
,
41 ec_GFp_simple_set_Jprojective_coordinates_GFp
,
42 ec_GFp_simple_get_Jprojective_coordinates_GFp
,
43 ec_GFp_simple_point_set_affine_coordinates
,
44 ec_GFp_simple_point_get_affine_coordinates
,
49 ec_GFp_simple_is_at_infinity
,
50 ec_GFp_simple_is_on_curve
,
52 ec_GFp_simple_make_affine
,
53 ec_GFp_simple_points_make_affine
,
55 0 /* precompute_mult */ ,
56 0 /* have_precompute_mult */ ,
57 ec_GFp_nist_field_mul
,
58 ec_GFp_nist_field_sqr
,
60 0 /* field_encode */ ,
61 0 /* field_decode */ ,
62 0, /* field_set_to_one */
63 ec_key_simple_priv2oct
,
64 ec_key_simple_oct2priv
,
66 ec_key_simple_generate_key
,
67 ec_key_simple_check_key
,
68 ec_key_simple_generate_public_key
,
71 ecdh_simple_compute_key
77 int ec_GFp_nist_group_copy(EC_GROUP
*dest
, const EC_GROUP
*src
)
79 dest
->field_mod_func
= src
->field_mod_func
;
81 return ec_GFp_simple_group_copy(dest
, src
);
84 int ec_GFp_nist_group_set_curve(EC_GROUP
*group
, const BIGNUM
*p
,
85 const BIGNUM
*a
, const BIGNUM
*b
, BN_CTX
*ctx
)
88 BN_CTX
*new_ctx
= NULL
;
91 if ((ctx
= new_ctx
= BN_CTX_new()) == NULL
)
96 if (BN_ucmp(BN_get0_nist_prime_192(), p
) == 0)
97 group
->field_mod_func
= BN_nist_mod_192
;
98 else if (BN_ucmp(BN_get0_nist_prime_224(), p
) == 0)
99 group
->field_mod_func
= BN_nist_mod_224
;
100 else if (BN_ucmp(BN_get0_nist_prime_256(), p
) == 0)
101 group
->field_mod_func
= BN_nist_mod_256
;
102 else if (BN_ucmp(BN_get0_nist_prime_384(), p
) == 0)
103 group
->field_mod_func
= BN_nist_mod_384
;
104 else if (BN_ucmp(BN_get0_nist_prime_521(), p
) == 0)
105 group
->field_mod_func
= BN_nist_mod_521
;
107 ECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE
, EC_R_NOT_A_NIST_PRIME
);
111 ret
= ec_GFp_simple_group_set_curve(group
, p
, a
, b
, ctx
);
115 BN_CTX_free(new_ctx
);
119 int ec_GFp_nist_field_mul(const EC_GROUP
*group
, BIGNUM
*r
, const BIGNUM
*a
,
120 const BIGNUM
*b
, BN_CTX
*ctx
)
123 BN_CTX
*ctx_new
= NULL
;
125 if (!group
|| !r
|| !a
|| !b
) {
126 ECerr(EC_F_EC_GFP_NIST_FIELD_MUL
, ERR_R_PASSED_NULL_PARAMETER
);
130 if ((ctx_new
= ctx
= BN_CTX_new()) == NULL
)
133 if (!BN_mul(r
, a
, b
, ctx
))
135 if (!group
->field_mod_func(r
, r
, group
->field
, ctx
))
140 BN_CTX_free(ctx_new
);
144 int ec_GFp_nist_field_sqr(const EC_GROUP
*group
, BIGNUM
*r
, const BIGNUM
*a
,
148 BN_CTX
*ctx_new
= NULL
;
150 if (!group
|| !r
|| !a
) {
151 ECerr(EC_F_EC_GFP_NIST_FIELD_SQR
, EC_R_PASSED_NULL_PARAMETER
);
155 if ((ctx_new
= ctx
= BN_CTX_new()) == NULL
)
158 if (!BN_sqr(r
, a
, ctx
))
160 if (!group
->field_mod_func(r
, r
, group
->field
, ctx
))
165 BN_CTX_free(ctx_new
);