crypto/ec/ec_oct.c

   1 /*
   2  * Copyright 2011-2016 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 <string.h>
  12
  13 #include <openssl/err.h>
  14 #include <openssl/opensslv.h>
  15
  16 #include "ec_lcl.h"
  17
  18 int EC_POINT_set_compressed_coordinates_GFp(const EC_GROUP *group,
  19                                             EC_POINT *point, const BIGNUM *x,
  20                                             int y_bit, BN_CTX *ctx)
  21 {
  22     if (group->meth->point_set_compressed_coordinates == 0
  23         && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) {
  24         ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GFP,
  25               ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
  26         return 0;
  27     }
  28     if (group->meth != point->meth) {
  29         ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GFP,
  30               EC_R_INCOMPATIBLE_OBJECTS);
  31         return 0;
  32     }
  33     if (group->meth->flags & EC_FLAGS_DEFAULT_OCT) {
  34         if (group->meth->field_type == NID_X9_62_prime_field)
  35             return ec_GFp_simple_set_compressed_coordinates(group, point, x,
  36                                                             y_bit, ctx);
  37         else
  38 #ifdef OPENSSL_NO_EC2M
  39         {
  40             ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GFP,
  41                   EC_R_GF2M_NOT_SUPPORTED);
  42             return 0;
  43         }
  44 #else
  45             return ec_GF2m_simple_set_compressed_coordinates(group, point, x,
  46                                                              y_bit, ctx);
  47 #endif
  48     }
  49     return group->meth->point_set_compressed_coordinates(group, point, x,
  50                                                          y_bit, ctx);
  51 }
  52
  53 #ifndef OPENSSL_NO_EC2M
  54 int EC_POINT_set_compressed_coordinates_GF2m(const EC_GROUP *group,
  55                                              EC_POINT *point, const BIGNUM *x,
  56                                              int y_bit, BN_CTX *ctx)
  57 {
  58     if (group->meth->point_set_compressed_coordinates == 0
  59         && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) {
  60         ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GF2M,
  61               ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
  62         return 0;
  63     }
  64     if (group->meth != point->meth) {
  65         ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GF2M,
  66               EC_R_INCOMPATIBLE_OBJECTS);
  67         return 0;
  68     }
  69     if (group->meth->flags & EC_FLAGS_DEFAULT_OCT) {
  70         if (group->meth->field_type == NID_X9_62_prime_field)
  71             return ec_GFp_simple_set_compressed_coordinates(group, point, x,
  72                                                             y_bit, ctx);
  73         else
  74             return ec_GF2m_simple_set_compressed_coordinates(group, point, x,
  75                                                              y_bit, ctx);
  76     }
  77     return group->meth->point_set_compressed_coordinates(group, point, x,
  78                                                          y_bit, ctx);
  79 }
  80 #endif
  81
  82 size_t EC_POINT_point2oct(const EC_GROUP *group, const EC_POINT *point,
  83                           point_conversion_form_t form, unsigned char *buf,
  84                           size_t len, BN_CTX *ctx)
  85 {
  86     if (group->meth->point2oct == 0
  87         && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) {
  88         ECerr(EC_F_EC_POINT_POINT2OCT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
  89         return 0;
  90     }
  91     if (group->meth != point->meth) {
  92         ECerr(EC_F_EC_POINT_POINT2OCT, EC_R_INCOMPATIBLE_OBJECTS);
  93         return 0;
  94     }
  95     if (group->meth->flags & EC_FLAGS_DEFAULT_OCT) {
  96         if (group->meth->field_type == NID_X9_62_prime_field)
  97             return ec_GFp_simple_point2oct(group, point, form, buf, len, ctx);
  98         else
  99 #ifdef OPENSSL_NO_EC2M
 100         {
 101             ECerr(EC_F_EC_POINT_POINT2OCT, EC_R_GF2M_NOT_SUPPORTED);
 102             return 0;
 103         }
 104 #else
 105             return ec_GF2m_simple_point2oct(group, point,
 106                                             form, buf, len, ctx);
 107 #endif
 108     }
 109
 110     return group->meth->point2oct(group, point, form, buf, len, ctx);
 111 }
 112
 113 int EC_POINT_oct2point(const EC_GROUP *group, EC_POINT *point,
 114                        const unsigned char *buf, size_t len, BN_CTX *ctx)
 115 {
 116     if (group->meth->oct2point == 0
 117         && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) {
 118         ECerr(EC_F_EC_POINT_OCT2POINT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 119         return 0;
 120     }
 121     if (group->meth != point->meth) {
 122         ECerr(EC_F_EC_POINT_OCT2POINT, EC_R_INCOMPATIBLE_OBJECTS);
 123         return 0;
 124     }
 125     if (group->meth->flags & EC_FLAGS_DEFAULT_OCT) {
 126         if (group->meth->field_type == NID_X9_62_prime_field)
 127             return ec_GFp_simple_oct2point(group, point, buf, len, ctx);
 128         else
 129 #ifdef OPENSSL_NO_EC2M
 130         {
 131             ECerr(EC_F_EC_POINT_OCT2POINT, EC_R_GF2M_NOT_SUPPORTED);
 132             return 0;
 133         }
 134 #else
 135             return ec_GF2m_simple_oct2point(group, point, buf, len, ctx);
 136 #endif
 137     }
 138     return group->meth->oct2point(group, point, buf, len, ctx);
 139 }
 140
 141 size_t EC_POINT_point2buf(const EC_GROUP *group, const EC_POINT *point,
 142                           point_conversion_form_t form,
 143                           unsigned char **pbuf, BN_CTX *ctx)
 144 {
 145     size_t len;
 146     unsigned char *buf;
 147
 148     len = EC_POINT_point2oct(group, point, form, NULL, 0, NULL);
 149     if (len == 0)
 150         return 0;
 151     if ((buf = OPENSSL_malloc(len)) == NULL) {
 152         ECerr(EC_F_EC_POINT_POINT2BUF, ERR_R_MALLOC_FAILURE);
 153         return 0;
 154     }
 155     len = EC_POINT_point2oct(group, point, form, buf, len, ctx);
 156     if (len == 0) {
 157         OPENSSL_free(buf);
 158         return 0;
 159     }
 160     *pbuf = buf;
 161     return len;
 162 }