crypto/ec/ecp_nist.c

   1 /*
   2  * Copyright 2001-2020 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 /*
  12  * ECDSA low level APIs are deprecated for public use, but still ok for
  13  * internal use.
  14  */
  15 #include "internal/deprecated.h"
  16
  17 #include <limits.h>
  18
  19 #include <openssl/err.h>
  20 #include <openssl/obj_mac.h>
  21 #include "ec_local.h"
  22
  23 const EC_METHOD *EC_GFp_nist_method(void)
  24 {
  25     static const EC_METHOD ret = {
  26         EC_FLAGS_DEFAULT_OCT,
  27         NID_X9_62_prime_field,
  28         ec_GFp_simple_group_init,
  29         ec_GFp_simple_group_finish,
  30         ec_GFp_simple_group_clear_finish,
  31         ec_GFp_nist_group_copy,
  32         ec_GFp_nist_group_set_curve,
  33         ec_GFp_simple_group_get_curve,
  34         ec_GFp_simple_group_get_degree,
  35         ec_group_simple_order_bits,
  36         ec_GFp_simple_group_check_discriminant,
  37         ec_GFp_simple_point_init,
  38         ec_GFp_simple_point_finish,
  39         ec_GFp_simple_point_clear_finish,
  40         ec_GFp_simple_point_copy,
  41         ec_GFp_simple_point_set_to_infinity,
  42         ec_GFp_simple_point_set_affine_coordinates,
  43         ec_GFp_simple_point_get_affine_coordinates,
  44         0, 0, 0,
  45         ec_GFp_simple_add,
  46         ec_GFp_simple_dbl,
  47         ec_GFp_simple_invert,
  48         ec_GFp_simple_is_at_infinity,
  49         ec_GFp_simple_is_on_curve,
  50         ec_GFp_simple_cmp,
  51         ec_GFp_simple_make_affine,
  52         ec_GFp_simple_points_make_affine,
  53         0 /* mul */ ,
  54         0 /* precompute_mult */ ,
  55         0 /* have_precompute_mult */ ,
  56         ec_GFp_nist_field_mul,
  57         ec_GFp_nist_field_sqr,
  58         0 /* field_div */ ,
  59         ec_GFp_simple_field_inv,
  60         0 /* field_encode */ ,
  61         0 /* field_decode */ ,
  62         0,                      /* field_set_to_one */
  63         ec_key_simple_priv2oct,
  64         ec_key_simple_oct2priv,
  65         0, /* set private */
  66         ec_key_simple_generate_key,
  67         ec_key_simple_check_key,
  68         ec_key_simple_generate_public_key,
  69         0, /* keycopy */
  70         0, /* keyfinish */
  71         ecdh_simple_compute_key,
  72         ecdsa_simple_sign_setup,
  73         ecdsa_simple_sign_sig,
  74         ecdsa_simple_verify_sig,
  75         0, /* field_inverse_mod_ord */
  76         ec_GFp_simple_blind_coordinates,
  77         ec_GFp_simple_ladder_pre,
  78         ec_GFp_simple_ladder_step,
  79         ec_GFp_simple_ladder_post
  80     };
  81
  82     return &ret;
  83 }
  84
  85 int ec_GFp_nist_group_copy(EC_GROUP *dest, const EC_GROUP *src)
  86 {
  87     dest->field_mod_func = src->field_mod_func;
  88
  89     return ec_GFp_simple_group_copy(dest, src);
  90 }
  91
  92 int ec_GFp_nist_group_set_curve(EC_GROUP *group, const BIGNUM *p,
  93                                 const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
  94 {
  95     int ret = 0;
  96     BN_CTX *new_ctx = NULL;
  97
  98     if (ctx == NULL)
  99         if ((ctx = new_ctx = BN_CTX_new_ex(group->libctx)) == NULL)
 100             return 0;
 101
 102     BN_CTX_start(ctx);
 103
 104     if (BN_ucmp(BN_get0_nist_prime_192(), p) == 0)
 105         group->field_mod_func = BN_nist_mod_192;
 106     else if (BN_ucmp(BN_get0_nist_prime_224(), p) == 0)
 107         group->field_mod_func = BN_nist_mod_224;
 108     else if (BN_ucmp(BN_get0_nist_prime_256(), p) == 0)
 109         group->field_mod_func = BN_nist_mod_256;
 110     else if (BN_ucmp(BN_get0_nist_prime_384(), p) == 0)
 111         group->field_mod_func = BN_nist_mod_384;
 112     else if (BN_ucmp(BN_get0_nist_prime_521(), p) == 0)
 113         group->field_mod_func = BN_nist_mod_521;
 114     else {
 115         ERR_raise(ERR_LIB_EC, EC_R_NOT_A_NIST_PRIME);
 116         goto err;
 117     }
 118
 119     ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx);
 120
 121  err:
 122     BN_CTX_end(ctx);
 123     BN_CTX_free(new_ctx);
 124     return ret;
 125 }
 126
 127 int ec_GFp_nist_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
 128                           const BIGNUM *b, BN_CTX *ctx)
 129 {
 130     int ret = 0;
 131     BN_CTX *ctx_new = NULL;
 132
 133     if (!group || !r || !a || !b) {
 134         ERR_raise(ERR_LIB_EC, ERR_R_PASSED_NULL_PARAMETER);
 135         goto err;
 136     }
 137     if (!ctx)
 138         if ((ctx_new = ctx = BN_CTX_new_ex(group->libctx)) == NULL)
 139             goto err;
 140
 141     if (!BN_mul(r, a, b, ctx))
 142         goto err;
 143     if (!group->field_mod_func(r, r, group->field, ctx))
 144         goto err;
 145
 146     ret = 1;
 147  err:
 148     BN_CTX_free(ctx_new);
 149     return ret;
 150 }
 151
 152 int ec_GFp_nist_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
 153                           BN_CTX *ctx)
 154 {
 155     int ret = 0;
 156     BN_CTX *ctx_new = NULL;
 157
 158     if (!group || !r || !a) {
 159         ERR_raise(ERR_LIB_EC, EC_R_PASSED_NULL_PARAMETER);
 160         goto err;
 161     }
 162     if (!ctx)
 163         if ((ctx_new = ctx = BN_CTX_new_ex(group->libctx)) == NULL)
 164             goto err;
 165
 166     if (!BN_sqr(r, a, ctx))
 167         goto err;
 168     if (!group->field_mod_func(r, r, group->field, ctx))
 169         goto err;
 170
 171     ret = 1;
 172  err:
 173     BN_CTX_free(ctx_new);
 174     return ret;
 175 }