crypto/ec/ec_oct.c

   1 /*
   2  * Copyright 2011-2020 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 <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         ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
  30         return 0;
  31     }
  32     if (!ec_point_is_compat(point, group)) {
  33         ERR_raise(ERR_LIB_EC, EC_R_INCOMPATIBLE_OBJECTS);
  34         return 0;
  35     }
  36     if (group->meth->flags & EC_FLAGS_DEFAULT_OCT) {
  37         if (group->meth->field_type == NID_X9_62_prime_field)
  38             return ec_GFp_simple_set_compressed_coordinates(group, point, x,
  39                                                             y_bit, ctx);
  40         else
  41 #ifdef OPENSSL_NO_EC2M
  42         {
  43             ERR_raise(ERR_LIB_EC, EC_R_GF2M_NOT_SUPPORTED);
  44             return 0;
  45         }
  46 #else
  47             return ec_GF2m_simple_set_compressed_coordinates(group, point, x,
  48                                                              y_bit, ctx);
  49 #endif
  50     }
  51     return group->meth->point_set_compressed_coordinates(group, point, x,
  52                                                          y_bit, ctx);
  53 }
  54
  55 #ifndef OPENSSL_NO_DEPRECATED_3_0
  56 int EC_POINT_set_compressed_coordinates_GFp(const EC_GROUP *group,
  57                                             EC_POINT *point, const BIGNUM *x,
  58                                             int y_bit, BN_CTX *ctx)
  59 {
  60     return EC_POINT_set_compressed_coordinates(group, point, x, y_bit, ctx);
  61 }
  62
  63 # ifndef OPENSSL_NO_EC2M
  64 int EC_POINT_set_compressed_coordinates_GF2m(const EC_GROUP *group,
  65                                              EC_POINT *point, const BIGNUM *x,
  66                                              int y_bit, BN_CTX *ctx)
  67 {
  68     return EC_POINT_set_compressed_coordinates(group, point, x, y_bit, ctx);
  69 }
  70 # endif
  71 #endif
  72
  73 size_t EC_POINT_point2oct(const EC_GROUP *group, const EC_POINT *point,
  74                           point_conversion_form_t form, unsigned char *buf,
  75                           size_t len, BN_CTX *ctx)
  76 {
  77     if (group->meth->point2oct == 0
  78         && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) {
  79         ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
  80         return 0;
  81     }
  82     if (!ec_point_is_compat(point, group)) {
  83         ERR_raise(ERR_LIB_EC, EC_R_INCOMPATIBLE_OBJECTS);
  84         return 0;
  85     }
  86     if (group->meth->flags & EC_FLAGS_DEFAULT_OCT) {
  87         if (group->meth->field_type == NID_X9_62_prime_field)
  88             return ec_GFp_simple_point2oct(group, point, form, buf, len, ctx);
  89         else
  90 #ifdef OPENSSL_NO_EC2M
  91         {
  92             ERR_raise(ERR_LIB_EC, EC_R_GF2M_NOT_SUPPORTED);
  93             return 0;
  94         }
  95 #else
  96             return ec_GF2m_simple_point2oct(group, point,
  97                                             form, buf, len, ctx);
  98 #endif
  99     }
 100
 101     return group->meth->point2oct(group, point, form, buf, len, ctx);
 102 }
 103
 104 int EC_POINT_oct2point(const EC_GROUP *group, EC_POINT *point,
 105                        const unsigned char *buf, size_t len, BN_CTX *ctx)
 106 {
 107     if (group->meth->oct2point == 0
 108         && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) {
 109         ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 110         return 0;
 111     }
 112     if (!ec_point_is_compat(point, group)) {
 113         ERR_raise(ERR_LIB_EC, EC_R_INCOMPATIBLE_OBJECTS);
 114         return 0;
 115     }
 116     if (group->meth->flags & EC_FLAGS_DEFAULT_OCT) {
 117         if (group->meth->field_type == NID_X9_62_prime_field)
 118             return ec_GFp_simple_oct2point(group, point, buf, len, ctx);
 119         else
 120 #ifdef OPENSSL_NO_EC2M
 121         {
 122             ERR_raise(ERR_LIB_EC, EC_R_GF2M_NOT_SUPPORTED);
 123             return 0;
 124         }
 125 #else
 126             return ec_GF2m_simple_oct2point(group, point, buf, len, ctx);
 127 #endif
 128     }
 129     return group->meth->oct2point(group, point, buf, len, ctx);
 130 }
 131
 132 size_t EC_POINT_point2buf(const EC_GROUP *group, const EC_POINT *point,
 133                           point_conversion_form_t form,
 134                           unsigned char **pbuf, BN_CTX *ctx)
 135 {
 136     size_t len;
 137     unsigned char *buf;
 138
 139     len = EC_POINT_point2oct(group, point, form, NULL, 0, NULL);
 140     if (len == 0)
 141         return 0;
 142     if ((buf = OPENSSL_malloc(len)) == NULL) {
 143         ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
 144         return 0;
 145     }
 146     len = EC_POINT_point2oct(group, point, form, buf, len, ctx);
 147     if (len == 0) {
 148         OPENSSL_free(buf);
 149         return 0;
 150     }
 151     *pbuf = buf;
 152     return len;
 153 }