crypto/ec/ecp_nist.c

   1 /*
   2  * Copyright 2001-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
   4  *
   5  * Licensed under the OpenSSL license (the "License").  You may not use
   6  * this file except in compliance with the License.  You can obtain a copy
   7  * in the file LICENSE in the source distribution or at
   8  * https://www.openssl.org/source/license.html
   9  */
  10
  11 #include <limits.h>
  12
  13 #include <openssl/err.h>
  14 #include <openssl/obj_mac.h>
  15 #include "ec_lcl.h"
  16
  17 const EC_METHOD *EC_GFp_nist_method(void)
  18 {
  19     static const EC_METHOD ret = {
  20         EC_FLAGS_DEFAULT_OCT,
  21         NID_X9_62_prime_field,
  22         ec_GFp_simple_group_init,
  23         ec_GFp_simple_group_finish,
  24         ec_GFp_simple_group_clear_finish,
  25         ec_GFp_nist_group_copy,
  26         ec_GFp_nist_group_set_curve,
  27         ec_GFp_simple_group_get_curve,
  28         ec_GFp_simple_group_get_degree,
  29         ec_group_simple_order_bits,
  30         ec_GFp_simple_group_check_discriminant,
  31         ec_GFp_simple_point_init,
  32         ec_GFp_simple_point_finish,
  33         ec_GFp_simple_point_clear_finish,
  34         ec_GFp_simple_point_copy,
  35         ec_GFp_simple_point_set_to_infinity,
  36         ec_GFp_simple_set_Jprojective_coordinates_GFp,
  37         ec_GFp_simple_get_Jprojective_coordinates_GFp,
  38         ec_GFp_simple_point_set_affine_coordinates,
  39         ec_GFp_simple_point_get_affine_coordinates,
  40         0, 0, 0,
  41         ec_GFp_simple_add,
  42         ec_GFp_simple_dbl,
  43         ec_GFp_simple_invert,
  44         ec_GFp_simple_is_at_infinity,
  45         ec_GFp_simple_is_on_curve,
  46         ec_GFp_simple_cmp,
  47         ec_GFp_simple_make_affine,
  48         ec_GFp_simple_points_make_affine,
  49         0 /* mul */ ,
  50         0 /* precompute_mult */ ,
  51         0 /* have_precompute_mult */ ,
  52         ec_GFp_nist_field_mul,
  53         ec_GFp_nist_field_sqr,
  54         0 /* field_div */ ,
  55         0 /* field_encode */ ,
  56         0 /* field_decode */ ,
  57         0,                      /* field_set_to_one */
  58         ec_key_simple_priv2oct,
  59         ec_key_simple_oct2priv,
  60         0, /* set private */
  61         ec_key_simple_generate_key,
  62         ec_key_simple_check_key,
  63         ec_key_simple_generate_public_key,
  64         0, /* keycopy */
  65         0, /* keyfinish */
  66         ecdh_simple_compute_key,
  67         0, /* field_inverse_mod_ord */
  68         ec_GFp_simple_blind_coordinates
  69     };
  70
  71     return &ret;
  72 }
  73
  74 int ec_GFp_nist_group_copy(EC_GROUP *dest, const EC_GROUP *src)
  75 {
  76     dest->field_mod_func = src->field_mod_func;
  77
  78     return ec_GFp_simple_group_copy(dest, src);
  79 }
  80
  81 int ec_GFp_nist_group_set_curve(EC_GROUP *group, const BIGNUM *p,
  82                                 const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
  83 {
  84     int ret = 0;
  85     BN_CTX *new_ctx = NULL;
  86
  87     if (ctx == NULL)
  88         if ((ctx = new_ctx = BN_CTX_new()) == NULL)
  89             return 0;
  90
  91     BN_CTX_start(ctx);
  92
  93     if (BN_ucmp(BN_get0_nist_prime_192(), p) == 0)
  94         group->field_mod_func = BN_nist_mod_192;
  95     else if (BN_ucmp(BN_get0_nist_prime_224(), p) == 0)
  96         group->field_mod_func = BN_nist_mod_224;
  97     else if (BN_ucmp(BN_get0_nist_prime_256(), p) == 0)
  98         group->field_mod_func = BN_nist_mod_256;
  99     else if (BN_ucmp(BN_get0_nist_prime_384(), p) == 0)
 100         group->field_mod_func = BN_nist_mod_384;
 101     else if (BN_ucmp(BN_get0_nist_prime_521(), p) == 0)
 102         group->field_mod_func = BN_nist_mod_521;
 103     else {
 104         ECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE, EC_R_NOT_A_NIST_PRIME);
 105         goto err;
 106     }
 107
 108     ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx);
 109
 110  err:
 111     BN_CTX_end(ctx);
 112     BN_CTX_free(new_ctx);
 113     return ret;
 114 }
 115
 116 int ec_GFp_nist_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
 117                           const BIGNUM *b, BN_CTX *ctx)
 118 {
 119     int ret = 0;
 120     BN_CTX *ctx_new = NULL;
 121
 122     if (!group || !r || !a || !b) {
 123         ECerr(EC_F_EC_GFP_NIST_FIELD_MUL, ERR_R_PASSED_NULL_PARAMETER);
 124         goto err;
 125     }
 126     if (!ctx)
 127         if ((ctx_new = ctx = BN_CTX_new()) == NULL)
 128             goto err;
 129
 130     if (!BN_mul(r, a, b, ctx))
 131         goto err;
 132     if (!group->field_mod_func(r, r, group->field, ctx))
 133         goto err;
 134
 135     ret = 1;
 136  err:
 137     BN_CTX_free(ctx_new);
 138     return ret;
 139 }
 140
 141 int ec_GFp_nist_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
 142                           BN_CTX *ctx)
 143 {
 144     int ret = 0;
 145     BN_CTX *ctx_new = NULL;
 146
 147     if (!group || !r || !a) {
 148         ECerr(EC_F_EC_GFP_NIST_FIELD_SQR, EC_R_PASSED_NULL_PARAMETER);
 149         goto err;
 150     }
 151     if (!ctx)
 152         if ((ctx_new = ctx = BN_CTX_new()) == NULL)
 153             goto err;
 154
 155     if (!BN_sqr(r, a, ctx))
 156         goto err;
 157     if (!group->field_mod_func(r, r, group->field, ctx))
 158         goto err;
 159
 160     ret = 1;
 161  err:
 162     BN_CTX_free(ctx_new);
 163     return ret;
 164 }