crypto/ec/ec_oct.c

   1 /*
   2  * Copyright 2011-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   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
   8  */
   9
  10 /* ====================================================================
  11  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
  12  * Binary polynomial ECC support in OpenSSL originally developed by
  13  * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
  14  */
  15
  16 #include <string.h>
  17
  18 #include <openssl/err.h>
  19 #include <openssl/opensslv.h>
  20
  21 #include "ec_lcl.h"
  22
  23 int EC_POINT_set_compressed_coordinates_GFp(const EC_GROUP *group,
  24                                             EC_POINT *point, const BIGNUM *x,
  25                                             int y_bit, BN_CTX *ctx)
  26 {
  27     if (group->meth->point_set_compressed_coordinates == 0
  28         && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) {
  29         ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GFP,
  30               ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
  31         return 0;
  32     }
  33     if (group->meth != point->meth) {
  34         ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GFP,
  35               EC_R_INCOMPATIBLE_OBJECTS);
  36         return 0;
  37     }
  38     if (group->meth->flags & EC_FLAGS_DEFAULT_OCT) {
  39         if (group->meth->field_type == NID_X9_62_prime_field)
  40             return ec_GFp_simple_set_compressed_coordinates(group, point, x,
  41                                                             y_bit, ctx);
  42         else
  43 #ifdef OPENSSL_NO_EC2M
  44         {
  45             ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GFP,
  46                   EC_R_GF2M_NOT_SUPPORTED);
  47             return 0;
  48         }
  49 #else
  50             return ec_GF2m_simple_set_compressed_coordinates(group, point, x,
  51                                                              y_bit, ctx);
  52 #endif
  53     }
  54     return group->meth->point_set_compressed_coordinates(group, point, x,
  55                                                          y_bit, ctx);
  56 }
  57
  58 #ifndef OPENSSL_NO_EC2M
  59 int EC_POINT_set_compressed_coordinates_GF2m(const EC_GROUP *group,
  60                                              EC_POINT *point, const BIGNUM *x,
  61                                              int y_bit, BN_CTX *ctx)
  62 {
  63     if (group->meth->point_set_compressed_coordinates == 0
  64         && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) {
  65         ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GF2M,
  66               ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
  67         return 0;
  68     }
  69     if (group->meth != point->meth) {
  70         ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GF2M,
  71               EC_R_INCOMPATIBLE_OBJECTS);
  72         return 0;
  73     }
  74     if (group->meth->flags & EC_FLAGS_DEFAULT_OCT) {
  75         if (group->meth->field_type == NID_X9_62_prime_field)
  76             return ec_GFp_simple_set_compressed_coordinates(group, point, x,
  77                                                             y_bit, ctx);
  78         else
  79             return ec_GF2m_simple_set_compressed_coordinates(group, point, x,
  80                                                              y_bit, ctx);
  81     }
  82     return group->meth->point_set_compressed_coordinates(group, point, x,
  83                                                          y_bit, ctx);
  84 }
  85 #endif
  86
  87 size_t EC_POINT_point2oct(const EC_GROUP *group, const EC_POINT *point,
  88                           point_conversion_form_t form, unsigned char *buf,
  89                           size_t len, BN_CTX *ctx)
  90 {
  91     if (group->meth->point2oct == 0
  92         && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) {
  93         ECerr(EC_F_EC_POINT_POINT2OCT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
  94         return 0;
  95     }
  96     if (group->meth != point->meth) {
  97         ECerr(EC_F_EC_POINT_POINT2OCT, EC_R_INCOMPATIBLE_OBJECTS);
  98         return 0;
  99     }
 100     if (group->meth->flags & EC_FLAGS_DEFAULT_OCT) {
 101         if (group->meth->field_type == NID_X9_62_prime_field)
 102             return ec_GFp_simple_point2oct(group, point, form, buf, len, ctx);
 103         else
 104 #ifdef OPENSSL_NO_EC2M
 105         {
 106             ECerr(EC_F_EC_POINT_POINT2OCT, EC_R_GF2M_NOT_SUPPORTED);
 107             return 0;
 108         }
 109 #else
 110             return ec_GF2m_simple_point2oct(group, point,
 111                                             form, buf, len, ctx);
 112 #endif
 113     }
 114
 115     return group->meth->point2oct(group, point, form, buf, len, ctx);
 116 }
 117
 118 int EC_POINT_oct2point(const EC_GROUP *group, EC_POINT *point,
 119                        const unsigned char *buf, size_t len, BN_CTX *ctx)
 120 {
 121     if (group->meth->oct2point == 0
 122         && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) {
 123         ECerr(EC_F_EC_POINT_OCT2POINT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 124         return 0;
 125     }
 126     if (group->meth != point->meth) {
 127         ECerr(EC_F_EC_POINT_OCT2POINT, EC_R_INCOMPATIBLE_OBJECTS);
 128         return 0;
 129     }
 130     if (group->meth->flags & EC_FLAGS_DEFAULT_OCT) {
 131         if (group->meth->field_type == NID_X9_62_prime_field)
 132             return ec_GFp_simple_oct2point(group, point, buf, len, ctx);
 133         else
 134 #ifdef OPENSSL_NO_EC2M
 135         {
 136             ECerr(EC_F_EC_POINT_OCT2POINT, EC_R_GF2M_NOT_SUPPORTED);
 137             return 0;
 138         }
 139 #else
 140             return ec_GF2m_simple_oct2point(group, point, buf, len, ctx);
 141 #endif
 142     }
 143     return group->meth->oct2point(group, point, buf, len, ctx);
 144 }
 145
 146 size_t EC_POINT_point2buf(const EC_GROUP *group, const EC_POINT *point,
 147                           point_conversion_form_t form,
 148                           unsigned char **pbuf, BN_CTX *ctx)
 149 {
 150     size_t len;
 151     unsigned char *buf;
 152     len = EC_POINT_point2oct(group, point, form, NULL, 0, NULL);
 153     if (len == 0)
 154         return 0;
 155     buf = OPENSSL_malloc(len);
 156     if (buf == NULL)
 157         return 0;
 158     len = EC_POINT_point2oct(group, point, form, buf, len, ctx);
 159     if (len == 0) {
 160         OPENSSL_free(buf);
 161         return 0;
 162     }
 163     *pbuf = buf;
 164     return len;
 165 }