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 Apache License 2.0 (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         ec_GFp_simple_ladder_pre,
  70         ec_GFp_simple_ladder_step,
  71         ec_GFp_simple_ladder_post
  72     };
  73
  74     return &ret;
  75 }
  76
  77 int ec_GFp_nist_group_copy(EC_GROUP *dest, const EC_GROUP *src)
  78 {
  79     dest->field_mod_func = src->field_mod_func;
  80
  81     return ec_GFp_simple_group_copy(dest, src);
  82 }
  83
  84 int ec_GFp_nist_group_set_curve(EC_GROUP *group, const BIGNUM *p,
  85                                 const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
  86 {
  87     int ret = 0;
  88     BN_CTX *new_ctx = NULL;
  89
  90     if (ctx == NULL)
  91         if ((ctx = new_ctx = BN_CTX_new()) == NULL)
  92             return 0;
  93
  94     BN_CTX_start(ctx);
  95
  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;
 106     else {
 107         ECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE, EC_R_NOT_A_NIST_PRIME);
 108         goto err;
 109     }
 110
 111     ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx);
 112
 113  err:
 114     BN_CTX_end(ctx);
 115     BN_CTX_free(new_ctx);
 116     return ret;
 117 }
 118
 119 int ec_GFp_nist_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
 120                           const BIGNUM *b, BN_CTX *ctx)
 121 {
 122     int ret = 0;
 123     BN_CTX *ctx_new = NULL;
 124
 125     if (!group || !r || !a || !b) {
 126         ECerr(EC_F_EC_GFP_NIST_FIELD_MUL, ERR_R_PASSED_NULL_PARAMETER);
 127         goto err;
 128     }
 129     if (!ctx)
 130         if ((ctx_new = ctx = BN_CTX_new()) == NULL)
 131             goto err;
 132
 133     if (!BN_mul(r, a, b, ctx))
 134         goto err;
 135     if (!group->field_mod_func(r, r, group->field, ctx))
 136         goto err;
 137
 138     ret = 1;
 139  err:
 140     BN_CTX_free(ctx_new);
 141     return ret;
 142 }
 143
 144 int ec_GFp_nist_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
 145                           BN_CTX *ctx)
 146 {
 147     int ret = 0;
 148     BN_CTX *ctx_new = NULL;
 149
 150     if (!group || !r || !a) {
 151         ECerr(EC_F_EC_GFP_NIST_FIELD_SQR, EC_R_PASSED_NULL_PARAMETER);
 152         goto err;
 153     }
 154     if (!ctx)
 155         if ((ctx_new = ctx = BN_CTX_new()) == NULL)
 156             goto err;
 157
 158     if (!BN_sqr(r, a, ctx))
 159         goto err;
 160     if (!group->field_mod_func(r, r, group->field, ctx))
 161         goto err;
 162
 163     ret = 1;
 164  err:
 165     BN_CTX_free(ctx_new);
 166     return ret;
 167 }