Manuel Pégourié-Gonnard | 0bad5c2 | 2013-01-26 15:30:46 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Elliptic curve Diffie-Hellman |
| 3 | * |
Bence Szépkúti | 1e14827 | 2020-08-07 13:07:28 +0200 | [diff] [blame] | 4 | * Copyright The Mbed TLS Contributors |
Manuel Pégourié-Gonnard | 37ff140 | 2015-09-04 14:21:07 +0200 | [diff] [blame] | 5 | * SPDX-License-Identifier: Apache-2.0 |
| 6 | * |
| 7 | * Licensed under the Apache License, Version 2.0 (the "License"); you may |
| 8 | * not use this file except in compliance with the License. |
| 9 | * You may obtain a copy of the License at |
| 10 | * |
| 11 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 12 | * |
| 13 | * Unless required by applicable law or agreed to in writing, software |
| 14 | * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| 15 | * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 16 | * See the License for the specific language governing permissions and |
| 17 | * limitations under the License. |
Manuel Pégourié-Gonnard | 0bad5c2 | 2013-01-26 15:30:46 +0100 | [diff] [blame] | 18 | */ |
| 19 | |
| 20 | /* |
| 21 | * References: |
| 22 | * |
| 23 | * SEC1 http://www.secg.org/index.php?action=secg,docs_secg |
Manuel Pégourié-Gonnard | 63533e4 | 2013-02-10 14:21:04 +0100 | [diff] [blame] | 24 | * RFC 4492 |
Manuel Pégourié-Gonnard | 0bad5c2 | 2013-01-26 15:30:46 +0100 | [diff] [blame] | 25 | */ |
| 26 | |
Gilles Peskine | db09ef6 | 2020-06-03 01:43:33 +0200 | [diff] [blame] | 27 | #include "common.h" |
Manuel Pégourié-Gonnard | 0bad5c2 | 2013-01-26 15:30:46 +0100 | [diff] [blame] | 28 | |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 29 | #if defined(MBEDTLS_ECDH_C) |
Manuel Pégourié-Gonnard | 0bad5c2 | 2013-01-26 15:30:46 +0100 | [diff] [blame] | 30 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 31 | # include "mbedtls/ecdh.h" |
| 32 | # include "mbedtls/platform_util.h" |
| 33 | # include "mbedtls/error.h" |
Manuel Pégourié-Gonnard | 0bad5c2 | 2013-01-26 15:30:46 +0100 | [diff] [blame] | 34 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 35 | # include <string.h> |
Rich Evans | 00ab470 | 2015-02-06 13:43:58 +0000 | [diff] [blame] | 36 | |
Hanno Becker | 91796d7 | 2018-12-17 18:10:51 +0000 | [diff] [blame] | 37 | /* Parameter validation macros based on platform_util.h */ |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 38 | # define ECDH_VALIDATE_RET(cond) \ |
| 39 | MBEDTLS_INTERNAL_VALIDATE_RET(cond, MBEDTLS_ERR_ECP_BAD_INPUT_DATA) |
| 40 | # define ECDH_VALIDATE(cond) MBEDTLS_INTERNAL_VALIDATE(cond) |
Hanno Becker | 91796d7 | 2018-12-17 18:10:51 +0000 | [diff] [blame] | 41 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 42 | # if defined(MBEDTLS_ECDH_LEGACY_CONTEXT) |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 43 | typedef mbedtls_ecdh_context mbedtls_ecdh_context_mbed; |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 44 | # endif |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 45 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 46 | static mbedtls_ecp_group_id mbedtls_ecdh_grp_id(const mbedtls_ecdh_context *ctx) |
Gilles Peskine | 3081629 | 2019-02-22 12:31:25 +0100 | [diff] [blame] | 47 | { |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 48 | # if defined(MBEDTLS_ECDH_LEGACY_CONTEXT) |
| 49 | return ctx->grp.id; |
| 50 | # else |
| 51 | return ctx->grp_id; |
| 52 | # endif |
Gilles Peskine | 3081629 | 2019-02-22 12:31:25 +0100 | [diff] [blame] | 53 | } |
| 54 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 55 | int mbedtls_ecdh_can_do(mbedtls_ecp_group_id gid) |
Gilles Peskine | 20b3ef3 | 2019-02-11 18:41:27 +0100 | [diff] [blame] | 56 | { |
| 57 | /* At this time, all groups support ECDH. */ |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 58 | (void)gid; |
| 59 | return 1; |
Gilles Peskine | 20b3ef3 | 2019-02-11 18:41:27 +0100 | [diff] [blame] | 60 | } |
| 61 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 62 | # if !defined(MBEDTLS_ECDH_GEN_PUBLIC_ALT) |
Manuel Pégourié-Gonnard | 6545ca7 | 2013-01-26 16:05:22 +0100 | [diff] [blame] | 63 | /* |
Manuel Pégourié-Gonnard | 66ba48a | 2017-04-27 11:38:26 +0200 | [diff] [blame] | 64 | * Generate public key (restartable version) |
Manuel Pégourié-Gonnard | c0edc96 | 2018-10-16 10:38:19 +0200 | [diff] [blame] | 65 | * |
| 66 | * Note: this internal function relies on its caller preserving the value of |
Manuel Pégourié-Gonnard | ca29fdf | 2018-10-22 09:56:53 +0200 | [diff] [blame] | 67 | * the output parameter 'd' across continuation calls. This would not be |
Manuel Pégourié-Gonnard | c0edc96 | 2018-10-16 10:38:19 +0200 | [diff] [blame] | 68 | * acceptable for a public function but is OK here as we control call sites. |
Manuel Pégourié-Gonnard | 66ba48a | 2017-04-27 11:38:26 +0200 | [diff] [blame] | 69 | */ |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 70 | static int |
| 71 | ecdh_gen_public_restartable(mbedtls_ecp_group *grp, |
| 72 | mbedtls_mpi *d, |
| 73 | mbedtls_ecp_point *Q, |
| 74 | int (*f_rng)(void *, unsigned char *, size_t), |
| 75 | void *p_rng, |
| 76 | mbedtls_ecp_restart_ctx *rs_ctx) |
Manuel Pégourié-Gonnard | 66ba48a | 2017-04-27 11:38:26 +0200 | [diff] [blame] | 77 | { |
Janos Follath | 24eed8d | 2019-11-22 13:21:35 +0000 | [diff] [blame] | 78 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Manuel Pégourié-Gonnard | 66ba48a | 2017-04-27 11:38:26 +0200 | [diff] [blame] | 79 | |
| 80 | /* If multiplication is in progress, we already generated a privkey */ |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 81 | # if defined(MBEDTLS_ECP_RESTARTABLE) |
| 82 | if (rs_ctx == NULL || rs_ctx->rsm == NULL) |
| 83 | # endif |
| 84 | MBEDTLS_MPI_CHK(mbedtls_ecp_gen_privkey(grp, d, f_rng, p_rng)); |
Manuel Pégourié-Gonnard | 66ba48a | 2017-04-27 11:38:26 +0200 | [diff] [blame] | 85 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 86 | MBEDTLS_MPI_CHK( |
| 87 | mbedtls_ecp_mul_restartable(grp, Q, d, &grp->G, f_rng, p_rng, rs_ctx)); |
Manuel Pégourié-Gonnard | 66ba48a | 2017-04-27 11:38:26 +0200 | [diff] [blame] | 88 | |
| 89 | cleanup: |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 90 | return ret; |
Manuel Pégourié-Gonnard | 66ba48a | 2017-04-27 11:38:26 +0200 | [diff] [blame] | 91 | } |
| 92 | |
| 93 | /* |
| 94 | * Generate public key |
Manuel Pégourié-Gonnard | 6545ca7 | 2013-01-26 16:05:22 +0100 | [diff] [blame] | 95 | */ |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 96 | int mbedtls_ecdh_gen_public(mbedtls_ecp_group *grp, |
| 97 | mbedtls_mpi *d, |
| 98 | mbedtls_ecp_point *Q, |
| 99 | int (*f_rng)(void *, unsigned char *, size_t), |
| 100 | void *p_rng) |
Manuel Pégourié-Gonnard | 6545ca7 | 2013-01-26 16:05:22 +0100 | [diff] [blame] | 101 | { |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 102 | ECDH_VALIDATE_RET(grp != NULL); |
| 103 | ECDH_VALIDATE_RET(d != NULL); |
| 104 | ECDH_VALIDATE_RET(Q != NULL); |
| 105 | ECDH_VALIDATE_RET(f_rng != NULL); |
| 106 | return ecdh_gen_public_restartable(grp, d, Q, f_rng, p_rng, NULL); |
Manuel Pégourié-Gonnard | 6545ca7 | 2013-01-26 16:05:22 +0100 | [diff] [blame] | 107 | } |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 108 | # endif /* !MBEDTLS_ECDH_GEN_PUBLIC_ALT */ |
Manuel Pégourié-Gonnard | 6545ca7 | 2013-01-26 16:05:22 +0100 | [diff] [blame] | 109 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 110 | # if !defined(MBEDTLS_ECDH_COMPUTE_SHARED_ALT) |
Manuel Pégourié-Gonnard | 6545ca7 | 2013-01-26 16:05:22 +0100 | [diff] [blame] | 111 | /* |
| 112 | * Compute shared secret (SEC1 3.3.1) |
| 113 | */ |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 114 | static int |
| 115 | ecdh_compute_shared_restartable(mbedtls_ecp_group *grp, |
| 116 | mbedtls_mpi *z, |
| 117 | const mbedtls_ecp_point *Q, |
| 118 | const mbedtls_mpi *d, |
| 119 | int (*f_rng)(void *, unsigned char *, size_t), |
| 120 | void *p_rng, |
| 121 | mbedtls_ecp_restart_ctx *rs_ctx) |
Manuel Pégourié-Gonnard | 6545ca7 | 2013-01-26 16:05:22 +0100 | [diff] [blame] | 122 | { |
Janos Follath | 24eed8d | 2019-11-22 13:21:35 +0000 | [diff] [blame] | 123 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 124 | mbedtls_ecp_point P; |
Manuel Pégourié-Gonnard | 6545ca7 | 2013-01-26 16:05:22 +0100 | [diff] [blame] | 125 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 126 | mbedtls_ecp_point_init(&P); |
Manuel Pégourié-Gonnard | 6545ca7 | 2013-01-26 16:05:22 +0100 | [diff] [blame] | 127 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 128 | MBEDTLS_MPI_CHK( |
| 129 | mbedtls_ecp_mul_restartable(grp, &P, d, Q, f_rng, p_rng, rs_ctx)); |
Manuel Pégourié-Gonnard | 6545ca7 | 2013-01-26 16:05:22 +0100 | [diff] [blame] | 130 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 131 | if (mbedtls_ecp_is_zero(&P)) { |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 132 | ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA; |
Paul Bakker | b548d77 | 2013-07-26 14:21:34 +0200 | [diff] [blame] | 133 | goto cleanup; |
| 134 | } |
Manuel Pégourié-Gonnard | 6545ca7 | 2013-01-26 16:05:22 +0100 | [diff] [blame] | 135 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 136 | MBEDTLS_MPI_CHK(mbedtls_mpi_copy(z, &P.X)); |
Manuel Pégourié-Gonnard | 6545ca7 | 2013-01-26 16:05:22 +0100 | [diff] [blame] | 137 | |
| 138 | cleanup: |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 139 | mbedtls_ecp_point_free(&P); |
Manuel Pégourié-Gonnard | 6545ca7 | 2013-01-26 16:05:22 +0100 | [diff] [blame] | 140 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 141 | return ret; |
Manuel Pégourié-Gonnard | 6545ca7 | 2013-01-26 16:05:22 +0100 | [diff] [blame] | 142 | } |
| 143 | |
Manuel Pégourié-Gonnard | 63533e4 | 2013-02-10 14:21:04 +0100 | [diff] [blame] | 144 | /* |
Manuel Pégourié-Gonnard | 66ba48a | 2017-04-27 11:38:26 +0200 | [diff] [blame] | 145 | * Compute shared secret (SEC1 3.3.1) |
| 146 | */ |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 147 | int mbedtls_ecdh_compute_shared(mbedtls_ecp_group *grp, |
| 148 | mbedtls_mpi *z, |
| 149 | const mbedtls_ecp_point *Q, |
| 150 | const mbedtls_mpi *d, |
| 151 | int (*f_rng)(void *, unsigned char *, size_t), |
| 152 | void *p_rng) |
Manuel Pégourié-Gonnard | 66ba48a | 2017-04-27 11:38:26 +0200 | [diff] [blame] | 153 | { |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 154 | ECDH_VALIDATE_RET(grp != NULL); |
| 155 | ECDH_VALIDATE_RET(Q != NULL); |
| 156 | ECDH_VALIDATE_RET(d != NULL); |
| 157 | ECDH_VALIDATE_RET(z != NULL); |
| 158 | return (ecdh_compute_shared_restartable(grp, z, Q, d, f_rng, p_rng, NULL)); |
Manuel Pégourié-Gonnard | 66ba48a | 2017-04-27 11:38:26 +0200 | [diff] [blame] | 159 | } |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 160 | # endif /* !MBEDTLS_ECDH_COMPUTE_SHARED_ALT */ |
Manuel Pégourié-Gonnard | 66ba48a | 2017-04-27 11:38:26 +0200 | [diff] [blame] | 161 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 162 | static void ecdh_init_internal(mbedtls_ecdh_context_mbed *ctx) |
Manuel Pégourié-Gonnard | 63533e4 | 2013-02-10 14:21:04 +0100 | [diff] [blame] | 163 | { |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 164 | mbedtls_ecp_group_init(&ctx->grp); |
| 165 | mbedtls_mpi_init(&ctx->d); |
| 166 | mbedtls_ecp_point_init(&ctx->Q); |
| 167 | mbedtls_ecp_point_init(&ctx->Qp); |
| 168 | mbedtls_mpi_init(&ctx->z); |
Manuel Pégourié-Gonnard | 66ba48a | 2017-04-27 11:38:26 +0200 | [diff] [blame] | 169 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 170 | # if defined(MBEDTLS_ECP_RESTARTABLE) |
| 171 | mbedtls_ecp_restart_init(&ctx->rs); |
| 172 | # endif |
Manuel Pégourié-Gonnard | 63533e4 | 2013-02-10 14:21:04 +0100 | [diff] [blame] | 173 | } |
| 174 | |
Manuel Pégourié-Gonnard | 63533e4 | 2013-02-10 14:21:04 +0100 | [diff] [blame] | 175 | /* |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 176 | * Initialize context |
Janos Follath | f61e486 | 2018-10-30 11:53:25 +0000 | [diff] [blame] | 177 | */ |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 178 | void mbedtls_ecdh_init(mbedtls_ecdh_context *ctx) |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 179 | { |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 180 | ECDH_VALIDATE(ctx != NULL); |
Hanno Becker | 91796d7 | 2018-12-17 18:10:51 +0000 | [diff] [blame] | 181 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 182 | # if defined(MBEDTLS_ECDH_LEGACY_CONTEXT) |
| 183 | ecdh_init_internal(ctx); |
| 184 | mbedtls_ecp_point_init(&ctx->Vi); |
| 185 | mbedtls_ecp_point_init(&ctx->Vf); |
| 186 | mbedtls_mpi_init(&ctx->_d); |
| 187 | # else |
| 188 | memset(ctx, 0, sizeof(mbedtls_ecdh_context)); |
Christoph M. Wintersteiger | d8c45d5 | 2019-02-20 17:16:53 +0000 | [diff] [blame] | 189 | |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 190 | ctx->var = MBEDTLS_ECDH_VARIANT_NONE; |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 191 | # endif |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 192 | ctx->point_format = MBEDTLS_ECP_PF_UNCOMPRESSED; |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 193 | # if defined(MBEDTLS_ECP_RESTARTABLE) |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 194 | ctx->restart_enabled = 0; |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 195 | # endif |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 196 | } |
| 197 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 198 | static int ecdh_setup_internal(mbedtls_ecdh_context_mbed *ctx, |
| 199 | mbedtls_ecp_group_id grp_id) |
Janos Follath | f61e486 | 2018-10-30 11:53:25 +0000 | [diff] [blame] | 200 | { |
Janos Follath | 24eed8d | 2019-11-22 13:21:35 +0000 | [diff] [blame] | 201 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Janos Follath | f61e486 | 2018-10-30 11:53:25 +0000 | [diff] [blame] | 202 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 203 | ret = mbedtls_ecp_group_load(&ctx->grp, grp_id); |
| 204 | if (ret != 0) { |
| 205 | return MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE; |
Janos Follath | f61e486 | 2018-10-30 11:53:25 +0000 | [diff] [blame] | 206 | } |
| 207 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 208 | return 0; |
Janos Follath | f61e486 | 2018-10-30 11:53:25 +0000 | [diff] [blame] | 209 | } |
| 210 | |
| 211 | /* |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 212 | * Setup context |
Manuel Pégourié-Gonnard | 63533e4 | 2013-02-10 14:21:04 +0100 | [diff] [blame] | 213 | */ |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 214 | int mbedtls_ecdh_setup(mbedtls_ecdh_context *ctx, mbedtls_ecp_group_id grp_id) |
Manuel Pégourié-Gonnard | 63533e4 | 2013-02-10 14:21:04 +0100 | [diff] [blame] | 215 | { |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 216 | ECDH_VALIDATE_RET(ctx != NULL); |
Manuel Pégourié-Gonnard | 63533e4 | 2013-02-10 14:21:04 +0100 | [diff] [blame] | 217 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 218 | # if defined(MBEDTLS_ECDH_LEGACY_CONTEXT) |
| 219 | return ecdh_setup_internal(ctx, grp_id); |
| 220 | # else |
| 221 | switch (grp_id) { |
| 222 | # if defined(MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED) |
Christoph M. Wintersteiger | 3ff60bc | 2019-02-15 12:59:59 +0000 | [diff] [blame] | 223 | case MBEDTLS_ECP_DP_CURVE25519: |
| 224 | ctx->point_format = MBEDTLS_ECP_PF_COMPRESSED; |
| 225 | ctx->var = MBEDTLS_ECDH_VARIANT_EVEREST; |
| 226 | ctx->grp_id = grp_id; |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 227 | return mbedtls_everest_setup(&ctx->ctx.everest_ecdh, grp_id); |
| 228 | # endif |
Christoph M. Wintersteiger | 3ff60bc | 2019-02-15 12:59:59 +0000 | [diff] [blame] | 229 | default: |
| 230 | ctx->point_format = MBEDTLS_ECP_PF_UNCOMPRESSED; |
| 231 | ctx->var = MBEDTLS_ECDH_VARIANT_MBEDTLS_2_0; |
| 232 | ctx->grp_id = grp_id; |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 233 | ecdh_init_internal(&ctx->ctx.mbed_ecdh); |
| 234 | return ecdh_setup_internal(&ctx->ctx.mbed_ecdh, grp_id); |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 235 | } |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 236 | # endif |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 237 | } |
| 238 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 239 | static void ecdh_free_internal(mbedtls_ecdh_context_mbed *ctx) |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 240 | { |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 241 | mbedtls_ecp_group_free(&ctx->grp); |
| 242 | mbedtls_mpi_free(&ctx->d); |
| 243 | mbedtls_ecp_point_free(&ctx->Q); |
| 244 | mbedtls_ecp_point_free(&ctx->Qp); |
| 245 | mbedtls_mpi_free(&ctx->z); |
Manuel Pégourié-Gonnard | 66ba48a | 2017-04-27 11:38:26 +0200 | [diff] [blame] | 246 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 247 | # if defined(MBEDTLS_ECP_RESTARTABLE) |
| 248 | mbedtls_ecp_restart_free(&ctx->rs); |
| 249 | # endif |
Manuel Pégourié-Gonnard | 63533e4 | 2013-02-10 14:21:04 +0100 | [diff] [blame] | 250 | } |
| 251 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 252 | # if defined(MBEDTLS_ECP_RESTARTABLE) |
Manuel Pégourié-Gonnard | 23e4162 | 2017-05-18 12:35:37 +0200 | [diff] [blame] | 253 | /* |
| 254 | * Enable restartable operations for context |
| 255 | */ |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 256 | void mbedtls_ecdh_enable_restart(mbedtls_ecdh_context *ctx) |
Manuel Pégourié-Gonnard | 23e4162 | 2017-05-18 12:35:37 +0200 | [diff] [blame] | 257 | { |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 258 | ECDH_VALIDATE(ctx != NULL); |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 259 | |
Manuel Pégourié-Gonnard | 23e4162 | 2017-05-18 12:35:37 +0200 | [diff] [blame] | 260 | ctx->restart_enabled = 1; |
| 261 | } |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 262 | # endif |
Manuel Pégourié-Gonnard | 23e4162 | 2017-05-18 12:35:37 +0200 | [diff] [blame] | 263 | |
Manuel Pégourié-Gonnard | 1372476 | 2013-02-10 15:01:54 +0100 | [diff] [blame] | 264 | /* |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 265 | * Free context |
Manuel Pégourié-Gonnard | 1372476 | 2013-02-10 15:01:54 +0100 | [diff] [blame] | 266 | */ |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 267 | void mbedtls_ecdh_free(mbedtls_ecdh_context *ctx) |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 268 | { |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 269 | if (ctx == NULL) |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 270 | return; |
| 271 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 272 | # if defined(MBEDTLS_ECDH_LEGACY_CONTEXT) |
| 273 | mbedtls_ecp_point_free(&ctx->Vi); |
| 274 | mbedtls_ecp_point_free(&ctx->Vf); |
| 275 | mbedtls_mpi_free(&ctx->_d); |
| 276 | ecdh_free_internal(ctx); |
| 277 | # else |
| 278 | switch (ctx->var) { |
| 279 | # if defined(MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED) |
Christoph M. Wintersteiger | c9f737b | 2018-10-25 13:03:05 +0100 | [diff] [blame] | 280 | case MBEDTLS_ECDH_VARIANT_EVEREST: |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 281 | mbedtls_everest_free(&ctx->ctx.everest_ecdh); |
Christoph M. Wintersteiger | c9f737b | 2018-10-25 13:03:05 +0100 | [diff] [blame] | 282 | break; |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 283 | # endif |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 284 | case MBEDTLS_ECDH_VARIANT_MBEDTLS_2_0: |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 285 | ecdh_free_internal(&ctx->ctx.mbed_ecdh); |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 286 | break; |
| 287 | default: |
| 288 | break; |
| 289 | } |
| 290 | |
| 291 | ctx->point_format = MBEDTLS_ECP_PF_UNCOMPRESSED; |
| 292 | ctx->var = MBEDTLS_ECDH_VARIANT_NONE; |
| 293 | ctx->grp_id = MBEDTLS_ECP_DP_NONE; |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 294 | # endif |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 295 | } |
| 296 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 297 | static int |
| 298 | ecdh_make_params_internal(mbedtls_ecdh_context_mbed *ctx, |
| 299 | size_t *olen, |
| 300 | int point_format, |
| 301 | unsigned char *buf, |
| 302 | size_t blen, |
| 303 | int (*f_rng)(void *, unsigned char *, size_t), |
| 304 | void *p_rng, |
| 305 | int restart_enabled) |
Manuel Pégourié-Gonnard | 1372476 | 2013-02-10 15:01:54 +0100 | [diff] [blame] | 306 | { |
Janos Follath | 24eed8d | 2019-11-22 13:21:35 +0000 | [diff] [blame] | 307 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Manuel Pégourié-Gonnard | 1372476 | 2013-02-10 15:01:54 +0100 | [diff] [blame] | 308 | size_t grp_len, pt_len; |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 309 | # if defined(MBEDTLS_ECP_RESTARTABLE) |
Manuel Pégourié-Gonnard | 66ba48a | 2017-04-27 11:38:26 +0200 | [diff] [blame] | 310 | mbedtls_ecp_restart_ctx *rs_ctx = NULL; |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 311 | # endif |
Manuel Pégourié-Gonnard | 1372476 | 2013-02-10 15:01:54 +0100 | [diff] [blame] | 312 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 313 | if (ctx->grp.pbits == 0) |
| 314 | return MBEDTLS_ERR_ECP_BAD_INPUT_DATA; |
Manuel Pégourié-Gonnard | f35b739 | 2013-02-11 22:12:39 +0100 | [diff] [blame] | 315 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 316 | # if defined(MBEDTLS_ECP_RESTARTABLE) |
| 317 | if (restart_enabled) |
Manuel Pégourié-Gonnard | 23e4162 | 2017-05-18 12:35:37 +0200 | [diff] [blame] | 318 | rs_ctx = &ctx->rs; |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 319 | # else |
| 320 | (void)restart_enabled; |
| 321 | # endif |
Manuel Pégourié-Gonnard | 66ba48a | 2017-04-27 11:38:26 +0200 | [diff] [blame] | 322 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 323 | # if defined(MBEDTLS_ECP_RESTARTABLE) |
| 324 | if ((ret = ecdh_gen_public_restartable(&ctx->grp, &ctx->d, &ctx->Q, f_rng, |
| 325 | p_rng, rs_ctx)) != 0) |
| 326 | return ret; |
| 327 | # else |
| 328 | if ((ret = mbedtls_ecdh_gen_public(&ctx->grp, &ctx->d, &ctx->Q, f_rng, |
| 329 | p_rng)) != 0) |
| 330 | return ret; |
| 331 | # endif /* MBEDTLS_ECP_RESTARTABLE */ |
Ron Eldor | 8493f80 | 2018-11-01 11:32:15 +0200 | [diff] [blame] | 332 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 333 | if ((ret = mbedtls_ecp_tls_write_group(&ctx->grp, &grp_len, buf, blen)) != |
| 334 | 0) |
| 335 | return ret; |
Manuel Pégourié-Gonnard | 1372476 | 2013-02-10 15:01:54 +0100 | [diff] [blame] | 336 | |
| 337 | buf += grp_len; |
| 338 | blen -= grp_len; |
| 339 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 340 | if ((ret = mbedtls_ecp_tls_write_point(&ctx->grp, &ctx->Q, point_format, |
| 341 | &pt_len, buf, blen)) != 0) |
| 342 | return ret; |
Manuel Pégourié-Gonnard | 1372476 | 2013-02-10 15:01:54 +0100 | [diff] [blame] | 343 | |
| 344 | *olen = grp_len + pt_len; |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 345 | return 0; |
Manuel Pégourié-Gonnard | 1372476 | 2013-02-10 15:01:54 +0100 | [diff] [blame] | 346 | } |
| 347 | |
Manuel Pégourié-Gonnard | 854fbd7 | 2013-02-11 20:28:55 +0100 | [diff] [blame] | 348 | /* |
Christoph M. Wintersteiger | c9f737b | 2018-10-25 13:03:05 +0100 | [diff] [blame] | 349 | * Setup and write the ServerKeyExchange parameters (RFC 4492) |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 350 | * struct { |
| 351 | * ECParameters curve_params; |
| 352 | * ECPoint public; |
| 353 | * } ServerECDHParams; |
| 354 | */ |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 355 | int mbedtls_ecdh_make_params(mbedtls_ecdh_context *ctx, |
| 356 | size_t *olen, |
| 357 | unsigned char *buf, |
| 358 | size_t blen, |
| 359 | int (*f_rng)(void *, unsigned char *, size_t), |
| 360 | void *p_rng) |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 361 | { |
| 362 | int restart_enabled = 0; |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 363 | ECDH_VALIDATE_RET(ctx != NULL); |
| 364 | ECDH_VALIDATE_RET(olen != NULL); |
| 365 | ECDH_VALIDATE_RET(buf != NULL); |
| 366 | ECDH_VALIDATE_RET(f_rng != NULL); |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 367 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 368 | # if defined(MBEDTLS_ECP_RESTARTABLE) |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 369 | restart_enabled = ctx->restart_enabled; |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 370 | # else |
| 371 | (void)restart_enabled; |
| 372 | # endif |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 373 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 374 | # if defined(MBEDTLS_ECDH_LEGACY_CONTEXT) |
| 375 | return (ecdh_make_params_internal(ctx, olen, ctx->point_format, buf, blen, |
| 376 | f_rng, p_rng, restart_enabled)); |
| 377 | # else |
| 378 | switch (ctx->var) { |
| 379 | # if defined(MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED) |
Christoph M. Wintersteiger | c9f737b | 2018-10-25 13:03:05 +0100 | [diff] [blame] | 380 | case MBEDTLS_ECDH_VARIANT_EVEREST: |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 381 | return (mbedtls_everest_make_params(&ctx->ctx.everest_ecdh, olen, |
| 382 | buf, blen, f_rng, p_rng)); |
| 383 | # endif |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 384 | case MBEDTLS_ECDH_VARIANT_MBEDTLS_2_0: |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 385 | return (ecdh_make_params_internal(&ctx->ctx.mbed_ecdh, olen, |
| 386 | ctx->point_format, buf, blen, |
| 387 | f_rng, p_rng, restart_enabled)); |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 388 | default: |
| 389 | return MBEDTLS_ERR_ECP_BAD_INPUT_DATA; |
| 390 | } |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 391 | # endif |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 392 | } |
| 393 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 394 | static int ecdh_read_params_internal(mbedtls_ecdh_context_mbed *ctx, |
| 395 | const unsigned char **buf, |
| 396 | const unsigned char *end) |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 397 | { |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 398 | return (mbedtls_ecp_tls_read_point(&ctx->grp, &ctx->Qp, buf, end - *buf)); |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 399 | } |
| 400 | |
| 401 | /* |
Manuel Pégourié-Gonnard | 854fbd7 | 2013-02-11 20:28:55 +0100 | [diff] [blame] | 402 | * Read the ServerKeyExhange parameters (RFC 4492) |
| 403 | * struct { |
| 404 | * ECParameters curve_params; |
| 405 | * ECPoint public; |
| 406 | * } ServerECDHParams; |
| 407 | */ |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 408 | int mbedtls_ecdh_read_params(mbedtls_ecdh_context *ctx, |
| 409 | const unsigned char **buf, |
| 410 | const unsigned char *end) |
Manuel Pégourié-Gonnard | 854fbd7 | 2013-02-11 20:28:55 +0100 | [diff] [blame] | 411 | { |
Janos Follath | 24eed8d | 2019-11-22 13:21:35 +0000 | [diff] [blame] | 412 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Janos Follath | f61e486 | 2018-10-30 11:53:25 +0000 | [diff] [blame] | 413 | mbedtls_ecp_group_id grp_id; |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 414 | ECDH_VALIDATE_RET(ctx != NULL); |
| 415 | ECDH_VALIDATE_RET(buf != NULL); |
| 416 | ECDH_VALIDATE_RET(*buf != NULL); |
| 417 | ECDH_VALIDATE_RET(end != NULL); |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 418 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 419 | if ((ret = mbedtls_ecp_tls_read_group_id(&grp_id, buf, end - *buf)) != 0) |
| 420 | return ret; |
Manuel Pégourié-Gonnard | 854fbd7 | 2013-02-11 20:28:55 +0100 | [diff] [blame] | 421 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 422 | if ((ret = mbedtls_ecdh_setup(ctx, grp_id)) != 0) |
| 423 | return ret; |
Janos Follath | f61e486 | 2018-10-30 11:53:25 +0000 | [diff] [blame] | 424 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 425 | # if defined(MBEDTLS_ECDH_LEGACY_CONTEXT) |
| 426 | return ecdh_read_params_internal(ctx, buf, end); |
| 427 | # else |
| 428 | switch (ctx->var) { |
| 429 | # if defined(MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED) |
Christoph M. Wintersteiger | c9f737b | 2018-10-25 13:03:05 +0100 | [diff] [blame] | 430 | case MBEDTLS_ECDH_VARIANT_EVEREST: |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 431 | return ( |
| 432 | mbedtls_everest_read_params(&ctx->ctx.everest_ecdh, buf, end)); |
| 433 | # endif |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 434 | case MBEDTLS_ECDH_VARIANT_MBEDTLS_2_0: |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 435 | return (ecdh_read_params_internal(&ctx->ctx.mbed_ecdh, buf, end)); |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 436 | default: |
| 437 | return MBEDTLS_ERR_ECP_BAD_INPUT_DATA; |
| 438 | } |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 439 | # endif |
Manuel Pégourié-Gonnard | 854fbd7 | 2013-02-11 20:28:55 +0100 | [diff] [blame] | 440 | } |
Manuel Pégourié-Gonnard | 0bad5c2 | 2013-01-26 15:30:46 +0100 | [diff] [blame] | 441 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 442 | static int ecdh_get_params_internal(mbedtls_ecdh_context_mbed *ctx, |
| 443 | const mbedtls_ecp_keypair *key, |
| 444 | mbedtls_ecdh_side side) |
Manuel Pégourié-Gonnard | cdff3cf | 2013-12-12 09:55:52 +0100 | [diff] [blame] | 445 | { |
Janos Follath | 24eed8d | 2019-11-22 13:21:35 +0000 | [diff] [blame] | 446 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Manuel Pégourié-Gonnard | cdff3cf | 2013-12-12 09:55:52 +0100 | [diff] [blame] | 447 | |
Manuel Pégourié-Gonnard | cdff3cf | 2013-12-12 09:55:52 +0100 | [diff] [blame] | 448 | /* If it's not our key, just import the public part as Qp */ |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 449 | if (side == MBEDTLS_ECDH_THEIRS) |
| 450 | return mbedtls_ecp_copy(&ctx->Qp, &key->Q); |
Manuel Pégourié-Gonnard | cdff3cf | 2013-12-12 09:55:52 +0100 | [diff] [blame] | 451 | |
| 452 | /* Our key: import public (as Q) and private parts */ |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 453 | if (side != MBEDTLS_ECDH_OURS) |
| 454 | return MBEDTLS_ERR_ECP_BAD_INPUT_DATA; |
Manuel Pégourié-Gonnard | cdff3cf | 2013-12-12 09:55:52 +0100 | [diff] [blame] | 455 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 456 | if ((ret = mbedtls_ecp_copy(&ctx->Q, &key->Q)) != 0 || |
| 457 | (ret = mbedtls_mpi_copy(&ctx->d, &key->d)) != 0) |
| 458 | return ret; |
Manuel Pégourié-Gonnard | cdff3cf | 2013-12-12 09:55:52 +0100 | [diff] [blame] | 459 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 460 | return 0; |
Manuel Pégourié-Gonnard | cdff3cf | 2013-12-12 09:55:52 +0100 | [diff] [blame] | 461 | } |
| 462 | |
| 463 | /* |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 464 | * Get parameters from a keypair |
Manuel Pégourié-Gonnard | 5cceb41 | 2013-02-11 21:51:45 +0100 | [diff] [blame] | 465 | */ |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 466 | int mbedtls_ecdh_get_params(mbedtls_ecdh_context *ctx, |
| 467 | const mbedtls_ecp_keypair *key, |
| 468 | mbedtls_ecdh_side side) |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 469 | { |
Janos Follath | 24eed8d | 2019-11-22 13:21:35 +0000 | [diff] [blame] | 470 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 471 | ECDH_VALIDATE_RET(ctx != NULL); |
| 472 | ECDH_VALIDATE_RET(key != NULL); |
| 473 | ECDH_VALIDATE_RET(side == MBEDTLS_ECDH_OURS || side == MBEDTLS_ECDH_THEIRS); |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 474 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 475 | if (mbedtls_ecdh_grp_id(ctx) == MBEDTLS_ECP_DP_NONE) { |
Gilles Peskine | 0b1b71d | 2018-11-07 22:10:59 +0100 | [diff] [blame] | 476 | /* This is the first call to get_params(). Set up the context |
| 477 | * for use with the group. */ |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 478 | if ((ret = mbedtls_ecdh_setup(ctx, key->grp.id)) != 0) |
| 479 | return ret; |
| 480 | } else { |
Gilles Peskine | 0b1b71d | 2018-11-07 22:10:59 +0100 | [diff] [blame] | 481 | /* This is not the first call to get_params(). Check that the |
| 482 | * current key's group is the same as the context's, which was set |
| 483 | * from the first key's group. */ |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 484 | if (mbedtls_ecdh_grp_id(ctx) != key->grp.id) |
| 485 | return MBEDTLS_ERR_ECP_BAD_INPUT_DATA; |
Gilles Peskine | 0b1b71d | 2018-11-07 22:10:59 +0100 | [diff] [blame] | 486 | } |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 487 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 488 | # if defined(MBEDTLS_ECDH_LEGACY_CONTEXT) |
| 489 | return ecdh_get_params_internal(ctx, key, side); |
| 490 | # else |
| 491 | switch (ctx->var) { |
| 492 | # if defined(MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED) |
Christoph M. Wintersteiger | c9f737b | 2018-10-25 13:03:05 +0100 | [diff] [blame] | 493 | case MBEDTLS_ECDH_VARIANT_EVEREST: |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 494 | { |
| 495 | mbedtls_everest_ecdh_side s = side == MBEDTLS_ECDH_OURS ? |
| 496 | MBEDTLS_EVEREST_ECDH_OURS : |
| 497 | MBEDTLS_EVEREST_ECDH_THEIRS; |
| 498 | return ( |
| 499 | mbedtls_everest_get_params(&ctx->ctx.everest_ecdh, key, s)); |
| 500 | } |
| 501 | # endif |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 502 | case MBEDTLS_ECDH_VARIANT_MBEDTLS_2_0: |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 503 | return (ecdh_get_params_internal(&ctx->ctx.mbed_ecdh, key, side)); |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 504 | default: |
| 505 | return MBEDTLS_ERR_ECP_BAD_INPUT_DATA; |
| 506 | } |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 507 | # endif |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 508 | } |
| 509 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 510 | static int |
| 511 | ecdh_make_public_internal(mbedtls_ecdh_context_mbed *ctx, |
| 512 | size_t *olen, |
| 513 | int point_format, |
| 514 | unsigned char *buf, |
| 515 | size_t blen, |
| 516 | int (*f_rng)(void *, unsigned char *, size_t), |
| 517 | void *p_rng, |
| 518 | int restart_enabled) |
Manuel Pégourié-Gonnard | 5cceb41 | 2013-02-11 21:51:45 +0100 | [diff] [blame] | 519 | { |
Janos Follath | 24eed8d | 2019-11-22 13:21:35 +0000 | [diff] [blame] | 520 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 521 | # if defined(MBEDTLS_ECP_RESTARTABLE) |
Manuel Pégourié-Gonnard | 66ba48a | 2017-04-27 11:38:26 +0200 | [diff] [blame] | 522 | mbedtls_ecp_restart_ctx *rs_ctx = NULL; |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 523 | # endif |
Manuel Pégourié-Gonnard | 5cceb41 | 2013-02-11 21:51:45 +0100 | [diff] [blame] | 524 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 525 | if (ctx->grp.pbits == 0) |
| 526 | return MBEDTLS_ERR_ECP_BAD_INPUT_DATA; |
Manuel Pégourié-Gonnard | f35b739 | 2013-02-11 22:12:39 +0100 | [diff] [blame] | 527 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 528 | # if defined(MBEDTLS_ECP_RESTARTABLE) |
| 529 | if (restart_enabled) |
Manuel Pégourié-Gonnard | 23e4162 | 2017-05-18 12:35:37 +0200 | [diff] [blame] | 530 | rs_ctx = &ctx->rs; |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 531 | # else |
| 532 | (void)restart_enabled; |
| 533 | # endif |
Manuel Pégourié-Gonnard | 66ba48a | 2017-04-27 11:38:26 +0200 | [diff] [blame] | 534 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 535 | # if defined(MBEDTLS_ECP_RESTARTABLE) |
| 536 | if ((ret = ecdh_gen_public_restartable(&ctx->grp, &ctx->d, &ctx->Q, f_rng, |
| 537 | p_rng, rs_ctx)) != 0) |
| 538 | return ret; |
| 539 | # else |
| 540 | if ((ret = mbedtls_ecdh_gen_public(&ctx->grp, &ctx->d, &ctx->Q, f_rng, |
| 541 | p_rng)) != 0) |
| 542 | return ret; |
| 543 | # endif /* MBEDTLS_ECP_RESTARTABLE */ |
Manuel Pégourié-Gonnard | 5cceb41 | 2013-02-11 21:51:45 +0100 | [diff] [blame] | 544 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 545 | return mbedtls_ecp_tls_write_point(&ctx->grp, &ctx->Q, point_format, olen, |
| 546 | buf, blen); |
Manuel Pégourié-Gonnard | 5cceb41 | 2013-02-11 21:51:45 +0100 | [diff] [blame] | 547 | } |
| 548 | |
| 549 | /* |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 550 | * Setup and export the client public value |
Manuel Pégourié-Gonnard | 5cceb41 | 2013-02-11 21:51:45 +0100 | [diff] [blame] | 551 | */ |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 552 | int mbedtls_ecdh_make_public(mbedtls_ecdh_context *ctx, |
| 553 | size_t *olen, |
| 554 | unsigned char *buf, |
| 555 | size_t blen, |
| 556 | int (*f_rng)(void *, unsigned char *, size_t), |
| 557 | void *p_rng) |
Manuel Pégourié-Gonnard | 5cceb41 | 2013-02-11 21:51:45 +0100 | [diff] [blame] | 558 | { |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 559 | int restart_enabled = 0; |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 560 | ECDH_VALIDATE_RET(ctx != NULL); |
| 561 | ECDH_VALIDATE_RET(olen != NULL); |
| 562 | ECDH_VALIDATE_RET(buf != NULL); |
| 563 | ECDH_VALIDATE_RET(f_rng != NULL); |
Manuel Pégourié-Gonnard | f35b739 | 2013-02-11 22:12:39 +0100 | [diff] [blame] | 564 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 565 | # if defined(MBEDTLS_ECP_RESTARTABLE) |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 566 | restart_enabled = ctx->restart_enabled; |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 567 | # endif |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 568 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 569 | # if defined(MBEDTLS_ECDH_LEGACY_CONTEXT) |
| 570 | return (ecdh_make_public_internal(ctx, olen, ctx->point_format, buf, blen, |
| 571 | f_rng, p_rng, restart_enabled)); |
| 572 | # else |
| 573 | switch (ctx->var) { |
| 574 | # if defined(MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED) |
Christoph M. Wintersteiger | c9f737b | 2018-10-25 13:03:05 +0100 | [diff] [blame] | 575 | case MBEDTLS_ECDH_VARIANT_EVEREST: |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 576 | return (mbedtls_everest_make_public(&ctx->ctx.everest_ecdh, olen, |
| 577 | buf, blen, f_rng, p_rng)); |
| 578 | # endif |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 579 | case MBEDTLS_ECDH_VARIANT_MBEDTLS_2_0: |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 580 | return (ecdh_make_public_internal(&ctx->ctx.mbed_ecdh, olen, |
| 581 | ctx->point_format, buf, blen, |
| 582 | f_rng, p_rng, restart_enabled)); |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 583 | default: |
| 584 | return MBEDTLS_ERR_ECP_BAD_INPUT_DATA; |
| 585 | } |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 586 | # endif |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 587 | } |
| 588 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 589 | static int ecdh_read_public_internal(mbedtls_ecdh_context_mbed *ctx, |
| 590 | const unsigned char *buf, |
| 591 | size_t blen) |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 592 | { |
Janos Follath | 24eed8d | 2019-11-22 13:21:35 +0000 | [diff] [blame] | 593 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 594 | const unsigned char *p = buf; |
| 595 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 596 | if ((ret = mbedtls_ecp_tls_read_point(&ctx->grp, &ctx->Qp, &p, blen)) != 0) |
| 597 | return ret; |
Manuel Pégourié-Gonnard | 969ccc6 | 2014-03-26 19:53:25 +0100 | [diff] [blame] | 598 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 599 | if ((size_t)(p - buf) != blen) |
| 600 | return MBEDTLS_ERR_ECP_BAD_INPUT_DATA; |
Manuel Pégourié-Gonnard | 969ccc6 | 2014-03-26 19:53:25 +0100 | [diff] [blame] | 601 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 602 | return 0; |
Manuel Pégourié-Gonnard | 5cceb41 | 2013-02-11 21:51:45 +0100 | [diff] [blame] | 603 | } |
| 604 | |
Manuel Pégourié-Gonnard | 424fda5 | 2013-02-11 22:05:42 +0100 | [diff] [blame] | 605 | /* |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 606 | * Parse and import the client's public value |
Manuel Pégourié-Gonnard | 424fda5 | 2013-02-11 22:05:42 +0100 | [diff] [blame] | 607 | */ |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 608 | int mbedtls_ecdh_read_public(mbedtls_ecdh_context *ctx, |
| 609 | const unsigned char *buf, |
| 610 | size_t blen) |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 611 | { |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 612 | ECDH_VALIDATE_RET(ctx != NULL); |
| 613 | ECDH_VALIDATE_RET(buf != NULL); |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 614 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 615 | # if defined(MBEDTLS_ECDH_LEGACY_CONTEXT) |
| 616 | return ecdh_read_public_internal(ctx, buf, blen); |
| 617 | # else |
| 618 | switch (ctx->var) { |
| 619 | # if defined(MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED) |
Christoph M. Wintersteiger | c9f737b | 2018-10-25 13:03:05 +0100 | [diff] [blame] | 620 | case MBEDTLS_ECDH_VARIANT_EVEREST: |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 621 | return ( |
| 622 | mbedtls_everest_read_public(&ctx->ctx.everest_ecdh, buf, blen)); |
| 623 | # endif |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 624 | case MBEDTLS_ECDH_VARIANT_MBEDTLS_2_0: |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 625 | return (ecdh_read_public_internal(&ctx->ctx.mbed_ecdh, buf, blen)); |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 626 | default: |
| 627 | return MBEDTLS_ERR_ECP_BAD_INPUT_DATA; |
| 628 | } |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 629 | # endif |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 630 | } |
| 631 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 632 | static int |
| 633 | ecdh_calc_secret_internal(mbedtls_ecdh_context_mbed *ctx, |
| 634 | size_t *olen, |
| 635 | unsigned char *buf, |
| 636 | size_t blen, |
| 637 | int (*f_rng)(void *, unsigned char *, size_t), |
| 638 | void *p_rng, |
| 639 | int restart_enabled) |
Manuel Pégourié-Gonnard | 424fda5 | 2013-02-11 22:05:42 +0100 | [diff] [blame] | 640 | { |
Janos Follath | 24eed8d | 2019-11-22 13:21:35 +0000 | [diff] [blame] | 641 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 642 | # if defined(MBEDTLS_ECP_RESTARTABLE) |
Manuel Pégourié-Gonnard | 66ba48a | 2017-04-27 11:38:26 +0200 | [diff] [blame] | 643 | mbedtls_ecp_restart_ctx *rs_ctx = NULL; |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 644 | # endif |
Manuel Pégourié-Gonnard | 424fda5 | 2013-02-11 22:05:42 +0100 | [diff] [blame] | 645 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 646 | if (ctx == NULL || ctx->grp.pbits == 0) |
| 647 | return MBEDTLS_ERR_ECP_BAD_INPUT_DATA; |
Manuel Pégourié-Gonnard | f35b739 | 2013-02-11 22:12:39 +0100 | [diff] [blame] | 648 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 649 | # if defined(MBEDTLS_ECP_RESTARTABLE) |
| 650 | if (restart_enabled) |
Manuel Pégourié-Gonnard | 23e4162 | 2017-05-18 12:35:37 +0200 | [diff] [blame] | 651 | rs_ctx = &ctx->rs; |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 652 | # else |
| 653 | (void)restart_enabled; |
| 654 | # endif |
Manuel Pégourié-Gonnard | 66ba48a | 2017-04-27 11:38:26 +0200 | [diff] [blame] | 655 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 656 | # if defined(MBEDTLS_ECP_RESTARTABLE) |
| 657 | if ((ret = ecdh_compute_shared_restartable(&ctx->grp, &ctx->z, &ctx->Qp, |
| 658 | &ctx->d, f_rng, p_rng, |
| 659 | rs_ctx)) != 0) { |
| 660 | return ret; |
Manuel Pégourié-Gonnard | e09d2f8 | 2013-09-02 14:29:09 +0200 | [diff] [blame] | 661 | } |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 662 | # else |
| 663 | if ((ret = mbedtls_ecdh_compute_shared(&ctx->grp, &ctx->z, &ctx->Qp, |
| 664 | &ctx->d, f_rng, p_rng)) != 0) { |
| 665 | return ret; |
Ron Eldor | 2981d8f | 2018-11-05 18:07:10 +0200 | [diff] [blame] | 666 | } |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 667 | # endif /* MBEDTLS_ECP_RESTARTABLE */ |
Manuel Pégourié-Gonnard | 424fda5 | 2013-02-11 22:05:42 +0100 | [diff] [blame] | 668 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 669 | if (mbedtls_mpi_size(&ctx->z) > blen) |
| 670 | return MBEDTLS_ERR_ECP_BAD_INPUT_DATA; |
Paul Bakker | 41c83d3 | 2013-03-20 14:39:14 +0100 | [diff] [blame] | 671 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 672 | *olen = ctx->grp.pbits / 8 + ((ctx->grp.pbits % 8) != 0); |
Janos Follath | ab0f71a | 2019-02-20 10:48:49 +0000 | [diff] [blame] | 673 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 674 | if (mbedtls_ecp_get_type(&ctx->grp) == MBEDTLS_ECP_TYPE_MONTGOMERY) |
| 675 | return mbedtls_mpi_write_binary_le(&ctx->z, buf, *olen); |
Janos Follath | ab0f71a | 2019-02-20 10:48:49 +0000 | [diff] [blame] | 676 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 677 | return mbedtls_mpi_write_binary(&ctx->z, buf, *olen); |
Manuel Pégourié-Gonnard | 424fda5 | 2013-02-11 22:05:42 +0100 | [diff] [blame] | 678 | } |
| 679 | |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 680 | /* |
| 681 | * Derive and export the shared secret |
| 682 | */ |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 683 | int mbedtls_ecdh_calc_secret(mbedtls_ecdh_context *ctx, |
| 684 | size_t *olen, |
| 685 | unsigned char *buf, |
| 686 | size_t blen, |
| 687 | int (*f_rng)(void *, unsigned char *, size_t), |
| 688 | void *p_rng) |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 689 | { |
| 690 | int restart_enabled = 0; |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 691 | ECDH_VALIDATE_RET(ctx != NULL); |
| 692 | ECDH_VALIDATE_RET(olen != NULL); |
| 693 | ECDH_VALIDATE_RET(buf != NULL); |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 694 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 695 | # if defined(MBEDTLS_ECP_RESTARTABLE) |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 696 | restart_enabled = ctx->restart_enabled; |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 697 | # endif |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 698 | |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 699 | # if defined(MBEDTLS_ECDH_LEGACY_CONTEXT) |
| 700 | return (ecdh_calc_secret_internal(ctx, olen, buf, blen, f_rng, p_rng, |
| 701 | restart_enabled)); |
| 702 | # else |
| 703 | switch (ctx->var) { |
| 704 | # if defined(MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED) |
Christoph M. Wintersteiger | c9f737b | 2018-10-25 13:03:05 +0100 | [diff] [blame] | 705 | case MBEDTLS_ECDH_VARIANT_EVEREST: |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 706 | return (mbedtls_everest_calc_secret(&ctx->ctx.everest_ecdh, olen, |
| 707 | buf, blen, f_rng, p_rng)); |
| 708 | # endif |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 709 | case MBEDTLS_ECDH_VARIANT_MBEDTLS_2_0: |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 710 | return (ecdh_calc_secret_internal(&ctx->ctx.mbed_ecdh, olen, buf, |
| 711 | blen, f_rng, p_rng, |
| 712 | restart_enabled)); |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 713 | default: |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 714 | return MBEDTLS_ERR_ECP_BAD_INPUT_DATA; |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 715 | } |
Mateusz Starzyk | c0eabdc | 2021-08-03 14:09:02 +0200 | [diff] [blame^] | 716 | # endif |
Janos Follath | 5a3e1bf | 2018-08-13 15:54:22 +0100 | [diff] [blame] | 717 | } |
| 718 | |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 719 | #endif /* MBEDTLS_ECDH_C */ |