[331] | 1 | /*
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| 2 | * Copyright 2011-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | /* ====================================================================
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| 11 | * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
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| 12 | * Binary polynomial ECC support in OpenSSL originally developed by
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| 13 | * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
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| 14 | */
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| 15 |
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| 16 | #include <string.h>
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| 17 |
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| 18 | #include <openssl/err.h>
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| 19 | #include <openssl/opensslv.h>
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| 20 |
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| 21 | #include "ec_lcl.h"
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| 22 |
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| 23 | int EC_POINT_set_compressed_coordinates_GFp(const EC_GROUP *group,
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| 24 | EC_POINT *point, const BIGNUM *x,
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| 25 | int y_bit, BN_CTX *ctx)
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| 26 | {
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| 27 | if (group->meth->point_set_compressed_coordinates == 0
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| 28 | && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) {
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| 29 | ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GFP,
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| 30 | ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
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| 31 | return 0;
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| 32 | }
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| 33 | if (group->meth != point->meth) {
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| 34 | ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GFP,
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| 35 | EC_R_INCOMPATIBLE_OBJECTS);
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| 36 | return 0;
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| 37 | }
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| 38 | if (group->meth->flags & EC_FLAGS_DEFAULT_OCT) {
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| 39 | if (group->meth->field_type == NID_X9_62_prime_field)
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| 40 | return ec_GFp_simple_set_compressed_coordinates(group, point, x,
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| 41 | y_bit, ctx);
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| 42 | else
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| 43 | #ifdef OPENSSL_NO_EC2M
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| 44 | {
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| 45 | ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GFP,
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| 46 | EC_R_GF2M_NOT_SUPPORTED);
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| 47 | return 0;
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| 48 | }
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| 49 | #else
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| 50 | return ec_GF2m_simple_set_compressed_coordinates(group, point, x,
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| 51 | y_bit, ctx);
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| 52 | #endif
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| 53 | }
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| 54 | return group->meth->point_set_compressed_coordinates(group, point, x,
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| 55 | y_bit, ctx);
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| 56 | }
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| 57 |
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| 58 | #ifndef OPENSSL_NO_EC2M
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| 59 | int EC_POINT_set_compressed_coordinates_GF2m(const EC_GROUP *group,
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| 60 | EC_POINT *point, const BIGNUM *x,
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| 61 | int y_bit, BN_CTX *ctx)
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| 62 | {
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| 63 | if (group->meth->point_set_compressed_coordinates == 0
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| 64 | && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) {
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| 65 | ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GF2M,
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| 66 | ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
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| 67 | return 0;
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| 68 | }
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| 69 | if (group->meth != point->meth) {
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| 70 | ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GF2M,
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| 71 | EC_R_INCOMPATIBLE_OBJECTS);
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| 72 | return 0;
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| 73 | }
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| 74 | if (group->meth->flags & EC_FLAGS_DEFAULT_OCT) {
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| 75 | if (group->meth->field_type == NID_X9_62_prime_field)
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| 76 | return ec_GFp_simple_set_compressed_coordinates(group, point, x,
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| 77 | y_bit, ctx);
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| 78 | else
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| 79 | return ec_GF2m_simple_set_compressed_coordinates(group, point, x,
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| 80 | y_bit, ctx);
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| 81 | }
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| 82 | return group->meth->point_set_compressed_coordinates(group, point, x,
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| 83 | y_bit, ctx);
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| 84 | }
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| 85 | #endif
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| 86 |
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| 87 | size_t EC_POINT_point2oct(const EC_GROUP *group, const EC_POINT *point,
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| 88 | point_conversion_form_t form, unsigned char *buf,
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| 89 | size_t len, BN_CTX *ctx)
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| 90 | {
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| 91 | if (group->meth->point2oct == 0
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| 92 | && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) {
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| 93 | ECerr(EC_F_EC_POINT_POINT2OCT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
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| 94 | return 0;
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| 95 | }
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| 96 | if (group->meth != point->meth) {
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| 97 | ECerr(EC_F_EC_POINT_POINT2OCT, EC_R_INCOMPATIBLE_OBJECTS);
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| 98 | return 0;
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| 99 | }
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| 100 | if (group->meth->flags & EC_FLAGS_DEFAULT_OCT) {
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| 101 | if (group->meth->field_type == NID_X9_62_prime_field)
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| 102 | return ec_GFp_simple_point2oct(group, point, form, buf, len, ctx);
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| 103 | else
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| 104 | #ifdef OPENSSL_NO_EC2M
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| 105 | {
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| 106 | ECerr(EC_F_EC_POINT_POINT2OCT, EC_R_GF2M_NOT_SUPPORTED);
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| 107 | return 0;
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| 108 | }
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| 109 | #else
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| 110 | return ec_GF2m_simple_point2oct(group, point,
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| 111 | form, buf, len, ctx);
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| 112 | #endif
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| 113 | }
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| 114 |
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| 115 | return group->meth->point2oct(group, point, form, buf, len, ctx);
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| 116 | }
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| 117 |
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| 118 | int EC_POINT_oct2point(const EC_GROUP *group, EC_POINT *point,
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| 119 | const unsigned char *buf, size_t len, BN_CTX *ctx)
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| 120 | {
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| 121 | if (group->meth->oct2point == 0
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| 122 | && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) {
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| 123 | ECerr(EC_F_EC_POINT_OCT2POINT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
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| 124 | return 0;
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| 125 | }
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| 126 | if (group->meth != point->meth) {
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| 127 | ECerr(EC_F_EC_POINT_OCT2POINT, EC_R_INCOMPATIBLE_OBJECTS);
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| 128 | return 0;
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| 129 | }
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| 130 | if (group->meth->flags & EC_FLAGS_DEFAULT_OCT) {
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| 131 | if (group->meth->field_type == NID_X9_62_prime_field)
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| 132 | return ec_GFp_simple_oct2point(group, point, buf, len, ctx);
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| 133 | else
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| 134 | #ifdef OPENSSL_NO_EC2M
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| 135 | {
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| 136 | ECerr(EC_F_EC_POINT_OCT2POINT, EC_R_GF2M_NOT_SUPPORTED);
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| 137 | return 0;
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| 138 | }
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| 139 | #else
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| 140 | return ec_GF2m_simple_oct2point(group, point, buf, len, ctx);
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| 141 | #endif
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| 142 | }
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| 143 | return group->meth->oct2point(group, point, buf, len, ctx);
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| 144 | }
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| 145 |
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| 146 | size_t EC_POINT_point2buf(const EC_GROUP *group, const EC_POINT *point,
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| 147 | point_conversion_form_t form,
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| 148 | unsigned char **pbuf, BN_CTX *ctx)
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| 149 | {
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| 150 | size_t len;
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| 151 | unsigned char *buf;
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| 152 | len = EC_POINT_point2oct(group, point, form, NULL, 0, NULL);
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| 153 | if (len == 0)
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| 154 | return 0;
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| 155 | buf = OPENSSL_malloc(len);
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| 156 | if (buf == NULL)
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| 157 | return 0;
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| 158 | len = EC_POINT_point2oct(group, point, form, buf, len, ctx);
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| 159 | if (len == 0) {
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| 160 | OPENSSL_free(buf);
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| 161 | return 0;
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| 162 | }
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| 163 | *pbuf = buf;
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| 164 | return len;
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| 165 | }
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