crypto/ec/ec_oct.c

   1 /*
   2  * Copyright 2011-2018 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 /*
  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 <string.h>
  18
  19 #include <openssl/err.h>
  20 #include <openssl/opensslv.h>
  21
  22 #include "ec_local.h"
  23
  24 int EC_POINT_set_compressed_coordinates(const EC_GROUP *group, EC_POINT *point,
  25                                         const BIGNUM *x, int y_bit, BN_CTX *ctx)
  26 {
  27     if (group->meth->point_set_compressed_coordinates == NULL
  28         && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) {
  29         ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES,
  30               ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
  31         return 0;
  32     }
  33     if (!ec_point_is_compat(point, group)) {
  34         ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES,
  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,
  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_DEPRECATED_3_0
  59 int EC_POINT_set_compressed_coordinates_GFp(const EC_GROUP *group,
  60                                             EC_POINT *point, const BIGNUM *x,
  61                                             int y_bit, BN_CTX *ctx)
  62 {
  63     return EC_POINT_set_compressed_coordinates(group, point, x, y_bit, ctx);
  64 }
  65
  66 # ifndef OPENSSL_NO_EC2M
  67 int EC_POINT_set_compressed_coordinates_GF2m(const EC_GROUP *group,
  68                                              EC_POINT *point, const BIGNUM *x,
  69                                              int y_bit, BN_CTX *ctx)
  70 {
  71     return EC_POINT_set_compressed_coordinates(group, point, x, y_bit, ctx);
  72 }
  73 # endif
  74 #endif
  75
  76 size_t EC_POINT_point2oct(const EC_GROUP *group, const EC_POINT *point,
  77                           point_conversion_form_t form, unsigned char *buf,
  78                           size_t len, BN_CTX *ctx)
  79 {
  80     if (group->meth->point2oct == 0
  81         && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) {
  82         ECerr(EC_F_EC_POINT_POINT2OCT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
  83         return 0;
  84     }
  85     if (!ec_point_is_compat(point, group)) {
  86         ECerr(EC_F_EC_POINT_POINT2OCT, EC_R_INCOMPATIBLE_OBJECTS);
  87         return 0;
  88     }
  89     if (group->meth->flags & EC_FLAGS_DEFAULT_OCT) {
  90         if (group->meth->field_type == NID_X9_62_prime_field)
  91             return ec_GFp_simple_point2oct(group, point, form, buf, len, ctx);
  92         else
  93 #ifdef OPENSSL_NO_EC2M
  94         {
  95             ECerr(EC_F_EC_POINT_POINT2OCT, EC_R_GF2M_NOT_SUPPORTED);
  96             return 0;
  97         }
  98 #else
  99             return ec_GF2m_simple_point2oct(group, point,
 100                                             form, buf, len, ctx);
 101 #endif
 102     }
 103
 104     return group->meth->point2oct(group, point, form, buf, len, ctx);
 105 }
 106
 107 int EC_POINT_oct2point(const EC_GROUP *group, EC_POINT *point,
 108                        const unsigned char *buf, size_t len, BN_CTX *ctx)
 109 {
 110     if (group->meth->oct2point == 0
 111         && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) {
 112         ECerr(EC_F_EC_POINT_OCT2POINT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 113         return 0;
 114     }
 115     if (!ec_point_is_compat(point, group)) {
 116         ECerr(EC_F_EC_POINT_OCT2POINT, EC_R_INCOMPATIBLE_OBJECTS);
 117         return 0;
 118     }
 119     if (group->meth->flags & EC_FLAGS_DEFAULT_OCT) {
 120         if (group->meth->field_type == NID_X9_62_prime_field)
 121             return ec_GFp_simple_oct2point(group, point, buf, len, ctx);
 122         else
 123 #ifdef OPENSSL_NO_EC2M
 124         {
 125             ECerr(EC_F_EC_POINT_OCT2POINT, EC_R_GF2M_NOT_SUPPORTED);
 126             return 0;
 127         }
 128 #else
 129             return ec_GF2m_simple_oct2point(group, point, buf, len, ctx);
 130 #endif
 131     }
 132     return group->meth->oct2point(group, point, buf, len, ctx);
 133 }
 134
 135 size_t EC_POINT_point2buf(const EC_GROUP *group, const EC_POINT *point,
 136                           point_conversion_form_t form,
 137                           unsigned char **pbuf, BN_CTX *ctx)
 138 {
 139     size_t len;
 140     unsigned char *buf;
 141
 142     len = EC_POINT_point2oct(group, point, form, NULL, 0, NULL);
 143     if (len == 0)
 144         return 0;
 145     if ((buf = OPENSSL_malloc(len)) == NULL) {
 146         ECerr(EC_F_EC_POINT_POINT2BUF, ERR_R_MALLOC_FAILURE);
 147         return 0;
 148     }
 149     len = EC_POINT_point2oct(group, point, form, buf, len, ctx);
 150     if (len == 0) {
 151         OPENSSL_free(buf);
 152         return 0;
 153     }
 154     *pbuf = buf;
 155     return len;
 156 }