Manuel Pégourié-Gonnard | 2aea141 | 2013-01-26 16:33:44 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Elliptic curve DSA |
| 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 | 2aea141 | 2013-01-26 16:33:44 +0100 | [diff] [blame] | 18 | */ |
| 19 | |
| 20 | /* |
| 21 | * References: |
| 22 | * |
| 23 | * SEC1 http://www.secg.org/index.php?action=secg,docs_secg |
| 24 | */ |
| 25 | |
Gilles Peskine | db09ef6 | 2020-06-03 01:43:33 +0200 | [diff] [blame] | 26 | #include "common.h" |
Manuel Pégourié-Gonnard | 2aea141 | 2013-01-26 16:33:44 +0100 | [diff] [blame] | 27 | |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 28 | #if defined(MBEDTLS_ECDSA_C) |
Manuel Pégourié-Gonnard | 2aea141 | 2013-01-26 16:33:44 +0100 | [diff] [blame] | 29 | |
Manuel Pégourié-Gonnard | 7f80997 | 2015-03-09 17:05:11 +0000 | [diff] [blame] | 30 | #include "mbedtls/ecdsa.h" |
| 31 | #include "mbedtls/asn1write.h" |
Manuel Pégourié-Gonnard | 2aea141 | 2013-01-26 16:33:44 +0100 | [diff] [blame] | 32 | |
Rich Evans | 00ab470 | 2015-02-06 13:43:58 +0000 | [diff] [blame] | 33 | #include <string.h> |
| 34 | |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 35 | #if defined(MBEDTLS_ECDSA_DETERMINISTIC) |
Manuel Pégourié-Gonnard | 7f80997 | 2015-03-09 17:05:11 +0000 | [diff] [blame] | 36 | #include "mbedtls/hmac_drbg.h" |
Manuel Pégourié-Gonnard | 7845fc0 | 2014-01-27 14:24:03 +0100 | [diff] [blame] | 37 | #endif |
Manuel Pégourié-Gonnard | 461d416 | 2014-01-06 10:16:28 +0100 | [diff] [blame] | 38 | |
Manuel Pégourié-Gonnard | a0c5bcc | 2017-04-21 11:33:57 +0200 | [diff] [blame] | 39 | #if defined(MBEDTLS_PLATFORM_C) |
| 40 | #include "mbedtls/platform.h" |
| 41 | #else |
| 42 | #include <stdlib.h> |
| 43 | #define mbedtls_calloc calloc |
| 44 | #define mbedtls_free free |
| 45 | #endif |
| 46 | |
Hanno Becker | 319ae11 | 2018-12-14 16:43:29 +0000 | [diff] [blame] | 47 | #include "mbedtls/platform_util.h" |
Janos Follath | 24eed8d | 2019-11-22 13:21:35 +0000 | [diff] [blame] | 48 | #include "mbedtls/error.h" |
Hanno Becker | 319ae11 | 2018-12-14 16:43:29 +0000 | [diff] [blame] | 49 | |
| 50 | /* Parameter validation macros based on platform_util.h */ |
| 51 | #define ECDSA_VALIDATE_RET( cond ) \ |
| 52 | MBEDTLS_INTERNAL_VALIDATE_RET( cond, MBEDTLS_ERR_ECP_BAD_INPUT_DATA ) |
| 53 | #define ECDSA_VALIDATE( cond ) \ |
| 54 | MBEDTLS_INTERNAL_VALIDATE( cond ) |
| 55 | |
Manuel Pégourié-Gonnard | a0c5bcc | 2017-04-21 11:33:57 +0200 | [diff] [blame] | 56 | #if defined(MBEDTLS_ECP_RESTARTABLE) |
Manuel Pégourié-Gonnard | 5314f23 | 2017-04-21 12:36:59 +0200 | [diff] [blame] | 57 | |
Manuel Pégourié-Gonnard | a0c5bcc | 2017-04-21 11:33:57 +0200 | [diff] [blame] | 58 | /* |
Manuel Pégourié-Gonnard | a4dd783 | 2017-09-07 11:11:39 +0200 | [diff] [blame] | 59 | * Sub-context for ecdsa_verify() |
Manuel Pégourié-Gonnard | a0c5bcc | 2017-04-21 11:33:57 +0200 | [diff] [blame] | 60 | */ |
| 61 | struct mbedtls_ecdsa_restart_ver |
| 62 | { |
Manuel Pégourié-Gonnard | 5314f23 | 2017-04-21 12:36:59 +0200 | [diff] [blame] | 63 | mbedtls_mpi u1, u2; /* intermediate values */ |
| 64 | enum { /* what to do next? */ |
| 65 | ecdsa_ver_init = 0, /* getting started */ |
| 66 | ecdsa_ver_muladd, /* muladd step */ |
| 67 | } state; |
Manuel Pégourié-Gonnard | a0c5bcc | 2017-04-21 11:33:57 +0200 | [diff] [blame] | 68 | }; |
| 69 | |
| 70 | /* |
| 71 | * Init verify restart sub-context |
| 72 | */ |
| 73 | static void ecdsa_restart_ver_init( mbedtls_ecdsa_restart_ver_ctx *ctx ) |
| 74 | { |
Manuel Pégourié-Gonnard | 5bd38b1 | 2017-08-23 16:55:59 +0200 | [diff] [blame] | 75 | mbedtls_mpi_init( &ctx->u1 ); |
| 76 | mbedtls_mpi_init( &ctx->u2 ); |
| 77 | ctx->state = ecdsa_ver_init; |
Manuel Pégourié-Gonnard | a0c5bcc | 2017-04-21 11:33:57 +0200 | [diff] [blame] | 78 | } |
| 79 | |
| 80 | /* |
| 81 | * Free the components of a verify restart sub-context |
| 82 | */ |
| 83 | static void ecdsa_restart_ver_free( mbedtls_ecdsa_restart_ver_ctx *ctx ) |
| 84 | { |
| 85 | if( ctx == NULL ) |
| 86 | return; |
| 87 | |
Manuel Pégourié-Gonnard | 5314f23 | 2017-04-21 12:36:59 +0200 | [diff] [blame] | 88 | mbedtls_mpi_free( &ctx->u1 ); |
| 89 | mbedtls_mpi_free( &ctx->u2 ); |
| 90 | |
Manuel Pégourié-Gonnard | 5bd38b1 | 2017-08-23 16:55:59 +0200 | [diff] [blame] | 91 | ecdsa_restart_ver_init( ctx ); |
Manuel Pégourié-Gonnard | a0c5bcc | 2017-04-21 11:33:57 +0200 | [diff] [blame] | 92 | } |
| 93 | |
Manuel Pégourié-Gonnard | b90883d | 2017-04-25 11:33:10 +0200 | [diff] [blame] | 94 | /* |
Manuel Pégourié-Gonnard | a4dd783 | 2017-09-07 11:11:39 +0200 | [diff] [blame] | 95 | * Sub-context for ecdsa_sign() |
Manuel Pégourié-Gonnard | b90883d | 2017-04-25 11:33:10 +0200 | [diff] [blame] | 96 | */ |
| 97 | struct mbedtls_ecdsa_restart_sig |
| 98 | { |
Manuel Pégourié-Gonnard | af081f5 | 2017-04-25 13:44:19 +0200 | [diff] [blame] | 99 | int sign_tries; |
| 100 | int key_tries; |
| 101 | mbedtls_mpi k; /* per-signature random */ |
| 102 | mbedtls_mpi r; /* r value */ |
Manuel Pégourié-Gonnard | b90883d | 2017-04-25 11:33:10 +0200 | [diff] [blame] | 103 | enum { /* what to do next? */ |
| 104 | ecdsa_sig_init = 0, /* getting started */ |
Manuel Pégourié-Gonnard | af081f5 | 2017-04-25 13:44:19 +0200 | [diff] [blame] | 105 | ecdsa_sig_mul, /* doing ecp_mul() */ |
| 106 | ecdsa_sig_modn, /* mod N computations */ |
Manuel Pégourié-Gonnard | b90883d | 2017-04-25 11:33:10 +0200 | [diff] [blame] | 107 | } state; |
| 108 | }; |
| 109 | |
| 110 | /* |
| 111 | * Init verify sign sub-context |
| 112 | */ |
| 113 | static void ecdsa_restart_sig_init( mbedtls_ecdsa_restart_sig_ctx *ctx ) |
| 114 | { |
Manuel Pégourié-Gonnard | 5bd38b1 | 2017-08-23 16:55:59 +0200 | [diff] [blame] | 115 | ctx->sign_tries = 0; |
| 116 | ctx->key_tries = 0; |
Manuel Pégourié-Gonnard | af081f5 | 2017-04-25 13:44:19 +0200 | [diff] [blame] | 117 | mbedtls_mpi_init( &ctx->k ); |
| 118 | mbedtls_mpi_init( &ctx->r ); |
Manuel Pégourié-Gonnard | 5bd38b1 | 2017-08-23 16:55:59 +0200 | [diff] [blame] | 119 | ctx->state = ecdsa_sig_init; |
Manuel Pégourié-Gonnard | b90883d | 2017-04-25 11:33:10 +0200 | [diff] [blame] | 120 | } |
| 121 | |
| 122 | /* |
| 123 | * Free the components of a sign restart sub-context |
| 124 | */ |
| 125 | static void ecdsa_restart_sig_free( mbedtls_ecdsa_restart_sig_ctx *ctx ) |
| 126 | { |
| 127 | if( ctx == NULL ) |
| 128 | return; |
| 129 | |
Manuel Pégourié-Gonnard | af081f5 | 2017-04-25 13:44:19 +0200 | [diff] [blame] | 130 | mbedtls_mpi_free( &ctx->k ); |
| 131 | mbedtls_mpi_free( &ctx->r ); |
Manuel Pégourié-Gonnard | b90883d | 2017-04-25 11:33:10 +0200 | [diff] [blame] | 132 | } |
| 133 | |
| 134 | #if defined(MBEDTLS_ECDSA_DETERMINISTIC) |
| 135 | /* |
Manuel Pégourié-Gonnard | a4dd783 | 2017-09-07 11:11:39 +0200 | [diff] [blame] | 136 | * Sub-context for ecdsa_sign_det() |
Manuel Pégourié-Gonnard | b90883d | 2017-04-25 11:33:10 +0200 | [diff] [blame] | 137 | */ |
| 138 | struct mbedtls_ecdsa_restart_det |
| 139 | { |
Manuel Pégourié-Gonnard | af081f5 | 2017-04-25 13:44:19 +0200 | [diff] [blame] | 140 | mbedtls_hmac_drbg_context rng_ctx; /* DRBG state */ |
Manuel Pégourié-Gonnard | b90883d | 2017-04-25 11:33:10 +0200 | [diff] [blame] | 141 | enum { /* what to do next? */ |
Manuel Pégourié-Gonnard | af081f5 | 2017-04-25 13:44:19 +0200 | [diff] [blame] | 142 | ecdsa_det_init = 0, /* getting started */ |
| 143 | ecdsa_det_sign, /* make signature */ |
Manuel Pégourié-Gonnard | b90883d | 2017-04-25 11:33:10 +0200 | [diff] [blame] | 144 | } state; |
| 145 | }; |
| 146 | |
| 147 | /* |
| 148 | * Init verify sign_det sub-context |
| 149 | */ |
| 150 | static void ecdsa_restart_det_init( mbedtls_ecdsa_restart_det_ctx *ctx ) |
| 151 | { |
Manuel Pégourié-Gonnard | af081f5 | 2017-04-25 13:44:19 +0200 | [diff] [blame] | 152 | mbedtls_hmac_drbg_init( &ctx->rng_ctx ); |
Manuel Pégourié-Gonnard | 5bd38b1 | 2017-08-23 16:55:59 +0200 | [diff] [blame] | 153 | ctx->state = ecdsa_det_init; |
Manuel Pégourié-Gonnard | b90883d | 2017-04-25 11:33:10 +0200 | [diff] [blame] | 154 | } |
| 155 | |
| 156 | /* |
| 157 | * Free the components of a sign_det restart sub-context |
| 158 | */ |
| 159 | static void ecdsa_restart_det_free( mbedtls_ecdsa_restart_det_ctx *ctx ) |
| 160 | { |
| 161 | if( ctx == NULL ) |
| 162 | return; |
| 163 | |
Manuel Pégourié-Gonnard | af081f5 | 2017-04-25 13:44:19 +0200 | [diff] [blame] | 164 | mbedtls_hmac_drbg_free( &ctx->rng_ctx ); |
| 165 | |
Manuel Pégourié-Gonnard | 5bd38b1 | 2017-08-23 16:55:59 +0200 | [diff] [blame] | 166 | ecdsa_restart_det_init( ctx ); |
Manuel Pégourié-Gonnard | b90883d | 2017-04-25 11:33:10 +0200 | [diff] [blame] | 167 | } |
| 168 | #endif /* MBEDTLS_ECDSA_DETERMINISTIC */ |
| 169 | |
Hanno Becker | 59c92ed | 2019-07-19 12:42:21 +0100 | [diff] [blame] | 170 | #define ECDSA_RS_ECP ( rs_ctx == NULL ? NULL : &rs_ctx->ecp ) |
Manuel Pégourié-Gonnard | a0c5bcc | 2017-04-21 11:33:57 +0200 | [diff] [blame] | 171 | |
Manuel Pégourié-Gonnard | 5314f23 | 2017-04-21 12:36:59 +0200 | [diff] [blame] | 172 | /* Utility macro for checking and updating ops budget */ |
| 173 | #define ECDSA_BUDGET( ops ) \ |
Hanno Becker | 59c92ed | 2019-07-19 12:42:21 +0100 | [diff] [blame] | 174 | MBEDTLS_MPI_CHK( mbedtls_ecp_check_budget( grp, ECDSA_RS_ECP, ops ) ); |
Manuel Pégourié-Gonnard | 5314f23 | 2017-04-21 12:36:59 +0200 | [diff] [blame] | 175 | |
Manuel Pégourié-Gonnard | b948f7d | 2017-08-23 17:58:40 +0200 | [diff] [blame] | 176 | /* Call this when entering a function that needs its own sub-context */ |
Manuel Pégourié-Gonnard | b90883d | 2017-04-25 11:33:10 +0200 | [diff] [blame] | 177 | #define ECDSA_RS_ENTER( SUB ) do { \ |
| 178 | /* reset ops count for this call if top-level */ \ |
| 179 | if( rs_ctx != NULL && rs_ctx->ecp.depth++ == 0 ) \ |
| 180 | rs_ctx->ecp.ops_done = 0; \ |
| 181 | \ |
| 182 | /* set up our own sub-context if needed */ \ |
Manuel Pégourié-Gonnard | b843b15 | 2018-10-16 10:41:31 +0200 | [diff] [blame] | 183 | if( mbedtls_ecp_restart_is_enabled() && \ |
Manuel Pégourié-Gonnard | b90883d | 2017-04-25 11:33:10 +0200 | [diff] [blame] | 184 | rs_ctx != NULL && rs_ctx->SUB == NULL ) \ |
| 185 | { \ |
| 186 | rs_ctx->SUB = mbedtls_calloc( 1, sizeof( *rs_ctx->SUB ) ); \ |
| 187 | if( rs_ctx->SUB == NULL ) \ |
| 188 | return( MBEDTLS_ERR_ECP_ALLOC_FAILED ); \ |
| 189 | \ |
| 190 | ecdsa_restart_## SUB ##_init( rs_ctx->SUB ); \ |
| 191 | } \ |
| 192 | } while( 0 ) |
| 193 | |
Manuel Pégourié-Gonnard | b948f7d | 2017-08-23 17:58:40 +0200 | [diff] [blame] | 194 | /* Call this when leaving a function that needs its own sub-context */ |
Manuel Pégourié-Gonnard | b90883d | 2017-04-25 11:33:10 +0200 | [diff] [blame] | 195 | #define ECDSA_RS_LEAVE( SUB ) do { \ |
| 196 | /* clear our sub-context when not in progress (done or error) */ \ |
Manuel Pégourié-Gonnard | b948f7d | 2017-08-23 17:58:40 +0200 | [diff] [blame] | 197 | if( rs_ctx != NULL && rs_ctx->SUB != NULL && \ |
| 198 | ret != MBEDTLS_ERR_ECP_IN_PROGRESS ) \ |
Manuel Pégourié-Gonnard | 31f0ef7 | 2017-05-17 10:05:58 +0200 | [diff] [blame] | 199 | { \ |
Manuel Pégourié-Gonnard | b90883d | 2017-04-25 11:33:10 +0200 | [diff] [blame] | 200 | ecdsa_restart_## SUB ##_free( rs_ctx->SUB ); \ |
| 201 | mbedtls_free( rs_ctx->SUB ); \ |
| 202 | rs_ctx->SUB = NULL; \ |
| 203 | } \ |
| 204 | \ |
| 205 | if( rs_ctx != NULL ) \ |
| 206 | rs_ctx->ecp.depth--; \ |
| 207 | } while( 0 ) |
| 208 | |
Manuel Pégourié-Gonnard | a0c5bcc | 2017-04-21 11:33:57 +0200 | [diff] [blame] | 209 | #else /* MBEDTLS_ECP_RESTARTABLE */ |
| 210 | |
| 211 | #define ECDSA_RS_ECP NULL |
| 212 | |
Manuel Pégourié-Gonnard | 5314f23 | 2017-04-21 12:36:59 +0200 | [diff] [blame] | 213 | #define ECDSA_BUDGET( ops ) /* no-op; for compatibility */ |
| 214 | |
Manuel Pégourié-Gonnard | b90883d | 2017-04-25 11:33:10 +0200 | [diff] [blame] | 215 | #define ECDSA_RS_ENTER( SUB ) (void) rs_ctx |
| 216 | #define ECDSA_RS_LEAVE( SUB ) (void) rs_ctx |
| 217 | |
Manuel Pégourié-Gonnard | a0c5bcc | 2017-04-21 11:33:57 +0200 | [diff] [blame] | 218 | #endif /* MBEDTLS_ECP_RESTARTABLE */ |
| 219 | |
Manuel Pégourié-Gonnard | b309ab2 | 2013-01-26 17:24:59 +0100 | [diff] [blame] | 220 | /* |
Manuel Pégourié-Gonnard | 3aeb5a7 | 2013-01-26 18:05:50 +0100 | [diff] [blame] | 221 | * Derive a suitable integer for group grp from a buffer of length len |
| 222 | * SEC1 4.1.3 step 5 aka SEC1 4.1.4 step 3 |
| 223 | */ |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 224 | static int derive_mpi( const mbedtls_ecp_group *grp, mbedtls_mpi *x, |
Manuel Pégourié-Gonnard | 3aeb5a7 | 2013-01-26 18:05:50 +0100 | [diff] [blame] | 225 | const unsigned char *buf, size_t blen ) |
| 226 | { |
Janos Follath | 24eed8d | 2019-11-22 13:21:35 +0000 | [diff] [blame] | 227 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Paul Bakker | 66d5d07 | 2014-06-17 16:39:18 +0200 | [diff] [blame] | 228 | size_t n_size = ( grp->nbits + 7 ) / 8; |
Manuel Pégourié-Gonnard | 5304812 | 2014-01-03 12:55:15 +0100 | [diff] [blame] | 229 | size_t use_size = blen > n_size ? n_size : blen; |
| 230 | |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 231 | MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( x, buf, use_size ) ); |
Manuel Pégourié-Gonnard | 5304812 | 2014-01-03 12:55:15 +0100 | [diff] [blame] | 232 | if( use_size * 8 > grp->nbits ) |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 233 | MBEDTLS_MPI_CHK( mbedtls_mpi_shift_r( x, use_size * 8 - grp->nbits ) ); |
Manuel Pégourié-Gonnard | 5304812 | 2014-01-03 12:55:15 +0100 | [diff] [blame] | 234 | |
Manuel Pégourié-Gonnard | 461d416 | 2014-01-06 10:16:28 +0100 | [diff] [blame] | 235 | /* While at it, reduce modulo N */ |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 236 | if( mbedtls_mpi_cmp_mpi( x, &grp->N ) >= 0 ) |
| 237 | MBEDTLS_MPI_CHK( mbedtls_mpi_sub_mpi( x, x, &grp->N ) ); |
Manuel Pégourié-Gonnard | 461d416 | 2014-01-06 10:16:28 +0100 | [diff] [blame] | 238 | |
Manuel Pégourié-Gonnard | 5304812 | 2014-01-03 12:55:15 +0100 | [diff] [blame] | 239 | cleanup: |
| 240 | return( ret ); |
Manuel Pégourié-Gonnard | 3aeb5a7 | 2013-01-26 18:05:50 +0100 | [diff] [blame] | 241 | } |
| 242 | |
Ron Eldor | 936d284 | 2018-11-01 13:05:52 +0200 | [diff] [blame] | 243 | #if !defined(MBEDTLS_ECDSA_SIGN_ALT) |
Manuel Pégourié-Gonnard | 3aeb5a7 | 2013-01-26 18:05:50 +0100 | [diff] [blame] | 244 | /* |
Manuel Pégourié-Gonnard | b309ab2 | 2013-01-26 17:24:59 +0100 | [diff] [blame] | 245 | * Compute ECDSA signature of a hashed message (SEC1 4.1.3) |
| 246 | * Obviously, compared to SEC1 4.1.3, we skip step 4 (hash message) |
| 247 | */ |
Manuel Pégourié-Gonnard | addb10e | 2017-04-21 12:54:46 +0200 | [diff] [blame] | 248 | static int ecdsa_sign_restartable( mbedtls_ecp_group *grp, |
| 249 | mbedtls_mpi *r, mbedtls_mpi *s, |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 250 | const mbedtls_mpi *d, const unsigned char *buf, size_t blen, |
Manuel Pégourié-Gonnard | addb10e | 2017-04-21 12:54:46 +0200 | [diff] [blame] | 251 | int (*f_rng)(void *, unsigned char *, size_t), void *p_rng, |
Janos Follath | dca667a | 2019-01-04 14:32:30 +0000 | [diff] [blame] | 252 | int (*f_rng_blind)(void *, unsigned char *, size_t), |
| 253 | void *p_rng_blind, |
Manuel Pégourié-Gonnard | addb10e | 2017-04-21 12:54:46 +0200 | [diff] [blame] | 254 | mbedtls_ecdsa_restart_ctx *rs_ctx ) |
Manuel Pégourié-Gonnard | b309ab2 | 2013-01-26 17:24:59 +0100 | [diff] [blame] | 255 | { |
Manuel Pégourié-Gonnard | 50b63ba | 2017-04-25 12:57:22 +0200 | [diff] [blame] | 256 | int ret, key_tries, sign_tries; |
Manuel Pégourié-Gonnard | af081f5 | 2017-04-25 13:44:19 +0200 | [diff] [blame] | 257 | int *p_sign_tries = &sign_tries, *p_key_tries = &key_tries; |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 258 | mbedtls_ecp_point R; |
| 259 | mbedtls_mpi k, e, t; |
Manuel Pégourié-Gonnard | af081f5 | 2017-04-25 13:44:19 +0200 | [diff] [blame] | 260 | mbedtls_mpi *pk = &k, *pr = r; |
Manuel Pégourié-Gonnard | b309ab2 | 2013-01-26 17:24:59 +0100 | [diff] [blame] | 261 | |
Manuel Pégourié-Gonnard | 97871ef | 2013-12-04 20:52:04 +0100 | [diff] [blame] | 262 | /* Fail cleanly on curves such as Curve25519 that can't be used for ECDSA */ |
Christoph M. Wintersteiger | c25df68 | 2019-04-16 12:54:56 +0100 | [diff] [blame] | 263 | if( ! mbedtls_ecdsa_can_do( grp->id ) || grp->N.p == NULL ) |
Christoph M. Wintersteiger | fba94e9 | 2018-12-06 17:18:24 +0000 | [diff] [blame] | 264 | return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA ); |
Manuel Pégourié-Gonnard | 97871ef | 2013-12-04 20:52:04 +0100 | [diff] [blame] | 265 | |
Darryl Green | c64a48b | 2017-11-17 17:09:17 +0000 | [diff] [blame] | 266 | /* Make sure d is in range 1..n-1 */ |
| 267 | if( mbedtls_mpi_cmp_int( d, 1 ) < 0 || mbedtls_mpi_cmp_mpi( d, &grp->N ) >= 0 ) |
| 268 | return( MBEDTLS_ERR_ECP_INVALID_KEY ); |
| 269 | |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 270 | mbedtls_ecp_point_init( &R ); |
| 271 | mbedtls_mpi_init( &k ); mbedtls_mpi_init( &e ); mbedtls_mpi_init( &t ); |
Manuel Pégourié-Gonnard | b309ab2 | 2013-01-26 17:24:59 +0100 | [diff] [blame] | 272 | |
Manuel Pégourié-Gonnard | b90883d | 2017-04-25 11:33:10 +0200 | [diff] [blame] | 273 | ECDSA_RS_ENTER( sig ); |
| 274 | |
| 275 | #if defined(MBEDTLS_ECP_RESTARTABLE) |
| 276 | if( rs_ctx != NULL && rs_ctx->sig != NULL ) |
| 277 | { |
| 278 | /* redirect to our context */ |
Manuel Pégourié-Gonnard | af081f5 | 2017-04-25 13:44:19 +0200 | [diff] [blame] | 279 | p_sign_tries = &rs_ctx->sig->sign_tries; |
| 280 | p_key_tries = &rs_ctx->sig->key_tries; |
| 281 | pk = &rs_ctx->sig->k; |
| 282 | pr = &rs_ctx->sig->r; |
| 283 | |
Manuel Pégourié-Gonnard | b90883d | 2017-04-25 11:33:10 +0200 | [diff] [blame] | 284 | /* jump to current step */ |
Manuel Pégourié-Gonnard | af081f5 | 2017-04-25 13:44:19 +0200 | [diff] [blame] | 285 | if( rs_ctx->sig->state == ecdsa_sig_mul ) |
| 286 | goto mul; |
| 287 | if( rs_ctx->sig->state == ecdsa_sig_modn ) |
| 288 | goto modn; |
Manuel Pégourié-Gonnard | b90883d | 2017-04-25 11:33:10 +0200 | [diff] [blame] | 289 | } |
| 290 | #endif /* MBEDTLS_ECP_RESTARTABLE */ |
| 291 | |
Manuel Pégourié-Gonnard | af081f5 | 2017-04-25 13:44:19 +0200 | [diff] [blame] | 292 | *p_sign_tries = 0; |
Manuel Pégourié-Gonnard | b309ab2 | 2013-01-26 17:24:59 +0100 | [diff] [blame] | 293 | do |
| 294 | { |
Manuel Pégourié-Gonnard | ee4ba54 | 2020-01-24 12:11:56 +0100 | [diff] [blame] | 295 | if( (*p_sign_tries)++ > 10 ) |
Manuel Pégourié-Gonnard | 6754396 | 2017-04-21 13:19:43 +0200 | [diff] [blame] | 296 | { |
| 297 | ret = MBEDTLS_ERR_ECP_RANDOM_FAILED; |
| 298 | goto cleanup; |
| 299 | } |
| 300 | |
Manuel Pégourié-Gonnard | b309ab2 | 2013-01-26 17:24:59 +0100 | [diff] [blame] | 301 | /* |
| 302 | * Steps 1-3: generate a suitable ephemeral keypair |
Manuel Pégourié-Gonnard | 178d9ba | 2013-10-29 10:45:28 +0100 | [diff] [blame] | 303 | * and set r = xR mod n |
Manuel Pégourié-Gonnard | b309ab2 | 2013-01-26 17:24:59 +0100 | [diff] [blame] | 304 | */ |
Manuel Pégourié-Gonnard | af081f5 | 2017-04-25 13:44:19 +0200 | [diff] [blame] | 305 | *p_key_tries = 0; |
Manuel Pégourié-Gonnard | b309ab2 | 2013-01-26 17:24:59 +0100 | [diff] [blame] | 306 | do |
| 307 | { |
Manuel Pégourié-Gonnard | ee4ba54 | 2020-01-24 12:11:56 +0100 | [diff] [blame] | 308 | if( (*p_key_tries)++ > 10 ) |
Paul Bakker | cca998a | 2013-07-26 14:20:53 +0200 | [diff] [blame] | 309 | { |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 310 | ret = MBEDTLS_ERR_ECP_RANDOM_FAILED; |
Paul Bakker | cca998a | 2013-07-26 14:20:53 +0200 | [diff] [blame] | 311 | goto cleanup; |
| 312 | } |
Manuel Pégourié-Gonnard | 6754396 | 2017-04-21 13:19:43 +0200 | [diff] [blame] | 313 | |
Manuel Pégourié-Gonnard | af081f5 | 2017-04-25 13:44:19 +0200 | [diff] [blame] | 314 | MBEDTLS_MPI_CHK( mbedtls_ecp_gen_privkey( grp, pk, f_rng, p_rng ) ); |
Manuel Pégourié-Gonnard | 50b63ba | 2017-04-25 12:57:22 +0200 | [diff] [blame] | 315 | |
Manuel Pégourié-Gonnard | af081f5 | 2017-04-25 13:44:19 +0200 | [diff] [blame] | 316 | #if defined(MBEDTLS_ECP_RESTARTABLE) |
| 317 | if( rs_ctx != NULL && rs_ctx->sig != NULL ) |
Manuel Pégourié-Gonnard | 6348181 | 2017-08-24 11:16:01 +0200 | [diff] [blame] | 318 | rs_ctx->sig->state = ecdsa_sig_mul; |
Manuel Pégourié-Gonnard | af081f5 | 2017-04-25 13:44:19 +0200 | [diff] [blame] | 319 | |
| 320 | mul: |
| 321 | #endif |
| 322 | MBEDTLS_MPI_CHK( mbedtls_ecp_mul_restartable( grp, &R, pk, &grp->G, |
Janos Follath | dca667a | 2019-01-04 14:32:30 +0000 | [diff] [blame] | 323 | f_rng_blind, |
| 324 | p_rng_blind, |
| 325 | ECDSA_RS_ECP ) ); |
Manuel Pégourié-Gonnard | af081f5 | 2017-04-25 13:44:19 +0200 | [diff] [blame] | 326 | MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( pr, &R.X, &grp->N ) ); |
Manuel Pégourié-Gonnard | b309ab2 | 2013-01-26 17:24:59 +0100 | [diff] [blame] | 327 | } |
Manuel Pégourié-Gonnard | af081f5 | 2017-04-25 13:44:19 +0200 | [diff] [blame] | 328 | while( mbedtls_mpi_cmp_int( pr, 0 ) == 0 ); |
| 329 | |
Manuel Pégourié-Gonnard | af081f5 | 2017-04-25 13:44:19 +0200 | [diff] [blame] | 330 | #if defined(MBEDTLS_ECP_RESTARTABLE) |
| 331 | if( rs_ctx != NULL && rs_ctx->sig != NULL ) |
Manuel Pégourié-Gonnard | 6348181 | 2017-08-24 11:16:01 +0200 | [diff] [blame] | 332 | rs_ctx->sig->state = ecdsa_sig_modn; |
Manuel Pégourié-Gonnard | af081f5 | 2017-04-25 13:44:19 +0200 | [diff] [blame] | 333 | |
| 334 | modn: |
| 335 | #endif |
| 336 | /* |
| 337 | * Accounting for everything up to the end of the loop |
| 338 | * (step 6, but checking now avoids saving e and t) |
| 339 | */ |
| 340 | ECDSA_BUDGET( MBEDTLS_ECP_OPS_INV + 4 ); |
Manuel Pégourié-Gonnard | b309ab2 | 2013-01-26 17:24:59 +0100 | [diff] [blame] | 341 | |
| 342 | /* |
| 343 | * Step 5: derive MPI from hashed message |
| 344 | */ |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 345 | MBEDTLS_MPI_CHK( derive_mpi( grp, &e, buf, blen ) ); |
Manuel Pégourié-Gonnard | b309ab2 | 2013-01-26 17:24:59 +0100 | [diff] [blame] | 346 | |
| 347 | /* |
Manuel Pégourié-Gonnard | dd75c31 | 2014-03-31 11:55:42 +0200 | [diff] [blame] | 348 | * Generate a random value to blind inv_mod in next step, |
| 349 | * avoiding a potential timing leak. |
| 350 | */ |
Janos Follath | dca667a | 2019-01-04 14:32:30 +0000 | [diff] [blame] | 351 | MBEDTLS_MPI_CHK( mbedtls_ecp_gen_privkey( grp, &t, f_rng_blind, |
| 352 | p_rng_blind ) ); |
Manuel Pégourié-Gonnard | dd75c31 | 2014-03-31 11:55:42 +0200 | [diff] [blame] | 353 | |
| 354 | /* |
| 355 | * Step 6: compute s = (e + r * d) / k = t (e + rd) / (kt) mod n |
Manuel Pégourié-Gonnard | b309ab2 | 2013-01-26 17:24:59 +0100 | [diff] [blame] | 356 | */ |
Manuel Pégourié-Gonnard | af081f5 | 2017-04-25 13:44:19 +0200 | [diff] [blame] | 357 | MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( s, pr, d ) ); |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 358 | MBEDTLS_MPI_CHK( mbedtls_mpi_add_mpi( &e, &e, s ) ); |
| 359 | MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &e, &e, &t ) ); |
Manuel Pégourié-Gonnard | af081f5 | 2017-04-25 13:44:19 +0200 | [diff] [blame] | 360 | MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( pk, pk, &t ) ); |
Janos Follath | 247c4d3 | 2019-10-17 10:18:51 +0100 | [diff] [blame] | 361 | MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( pk, pk, &grp->N ) ); |
Manuel Pégourié-Gonnard | af081f5 | 2017-04-25 13:44:19 +0200 | [diff] [blame] | 362 | MBEDTLS_MPI_CHK( mbedtls_mpi_inv_mod( s, pk, &grp->N ) ); |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 363 | MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( s, s, &e ) ); |
| 364 | MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( s, s, &grp->N ) ); |
Manuel Pégourié-Gonnard | b309ab2 | 2013-01-26 17:24:59 +0100 | [diff] [blame] | 365 | } |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 366 | while( mbedtls_mpi_cmp_int( s, 0 ) == 0 ); |
Manuel Pégourié-Gonnard | b309ab2 | 2013-01-26 17:24:59 +0100 | [diff] [blame] | 367 | |
Manuel Pégourié-Gonnard | af081f5 | 2017-04-25 13:44:19 +0200 | [diff] [blame] | 368 | #if defined(MBEDTLS_ECP_RESTARTABLE) |
Manuel Pégourié-Gonnard | 28d1628 | 2017-08-23 17:33:27 +0200 | [diff] [blame] | 369 | if( rs_ctx != NULL && rs_ctx->sig != NULL ) |
| 370 | mbedtls_mpi_copy( r, pr ); |
Manuel Pégourié-Gonnard | af081f5 | 2017-04-25 13:44:19 +0200 | [diff] [blame] | 371 | #endif |
| 372 | |
Manuel Pégourié-Gonnard | b309ab2 | 2013-01-26 17:24:59 +0100 | [diff] [blame] | 373 | cleanup: |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 374 | mbedtls_ecp_point_free( &R ); |
| 375 | mbedtls_mpi_free( &k ); mbedtls_mpi_free( &e ); mbedtls_mpi_free( &t ); |
Manuel Pégourié-Gonnard | b309ab2 | 2013-01-26 17:24:59 +0100 | [diff] [blame] | 376 | |
Manuel Pégourié-Gonnard | b90883d | 2017-04-25 11:33:10 +0200 | [diff] [blame] | 377 | ECDSA_RS_LEAVE( sig ); |
| 378 | |
Manuel Pégourié-Gonnard | b309ab2 | 2013-01-26 17:24:59 +0100 | [diff] [blame] | 379 | return( ret ); |
| 380 | } |
Manuel Pégourié-Gonnard | 2aea141 | 2013-01-26 16:33:44 +0100 | [diff] [blame] | 381 | |
Christoph M. Wintersteiger | 0082f9d | 2019-01-07 13:47:30 +0000 | [diff] [blame] | 382 | int mbedtls_ecdsa_can_do( mbedtls_ecp_group_id gid ) |
| 383 | { |
| 384 | switch( gid ) |
| 385 | { |
| 386 | #ifdef MBEDTLS_ECP_DP_CURVE25519_ENABLED |
Christoph M. Wintersteiger | 3ff60bc | 2019-02-15 12:59:59 +0000 | [diff] [blame] | 387 | case MBEDTLS_ECP_DP_CURVE25519: return 0; |
Christoph M. Wintersteiger | 0082f9d | 2019-01-07 13:47:30 +0000 | [diff] [blame] | 388 | #endif |
| 389 | #ifdef MBEDTLS_ECP_DP_CURVE448_ENABLED |
Christoph M. Wintersteiger | 3ff60bc | 2019-02-15 12:59:59 +0000 | [diff] [blame] | 390 | case MBEDTLS_ECP_DP_CURVE448: return 0; |
Christoph M. Wintersteiger | 0082f9d | 2019-01-07 13:47:30 +0000 | [diff] [blame] | 391 | #endif |
| 392 | default: return 1; |
| 393 | } |
| 394 | } |
| 395 | |
Manuel Pégourié-Gonnard | addb10e | 2017-04-21 12:54:46 +0200 | [diff] [blame] | 396 | /* |
| 397 | * Compute ECDSA signature of a hashed message |
| 398 | */ |
| 399 | int mbedtls_ecdsa_sign( mbedtls_ecp_group *grp, mbedtls_mpi *r, mbedtls_mpi *s, |
| 400 | const mbedtls_mpi *d, const unsigned char *buf, size_t blen, |
| 401 | int (*f_rng)(void *, unsigned char *, size_t), void *p_rng ) |
| 402 | { |
Hanno Becker | 319ae11 | 2018-12-14 16:43:29 +0000 | [diff] [blame] | 403 | ECDSA_VALIDATE_RET( grp != NULL ); |
| 404 | ECDSA_VALIDATE_RET( r != NULL ); |
| 405 | ECDSA_VALIDATE_RET( s != NULL ); |
| 406 | ECDSA_VALIDATE_RET( d != NULL ); |
| 407 | ECDSA_VALIDATE_RET( f_rng != NULL ); |
| 408 | ECDSA_VALIDATE_RET( buf != NULL || blen == 0 ); |
| 409 | |
Janos Follath | dca667a | 2019-01-04 14:32:30 +0000 | [diff] [blame] | 410 | /* Use the same RNG for both blinding and ephemeral key generation */ |
Manuel Pégourié-Gonnard | addb10e | 2017-04-21 12:54:46 +0200 | [diff] [blame] | 411 | return( ecdsa_sign_restartable( grp, r, s, d, buf, blen, |
Janos Follath | dca667a | 2019-01-04 14:32:30 +0000 | [diff] [blame] | 412 | f_rng, p_rng, f_rng, p_rng, NULL ) ); |
Manuel Pégourié-Gonnard | addb10e | 2017-04-21 12:54:46 +0200 | [diff] [blame] | 413 | } |
Ron Eldor | 936d284 | 2018-11-01 13:05:52 +0200 | [diff] [blame] | 414 | #endif /* !MBEDTLS_ECDSA_SIGN_ALT */ |
Manuel Pégourié-Gonnard | addb10e | 2017-04-21 12:54:46 +0200 | [diff] [blame] | 415 | |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 416 | #if defined(MBEDTLS_ECDSA_DETERMINISTIC) |
Manuel Pégourié-Gonnard | 4daaef7 | 2014-01-06 14:25:56 +0100 | [diff] [blame] | 417 | /* |
| 418 | * Deterministic signature wrapper |
TRodziewicz | 18efb73 | 2021-04-29 23:12:19 +0200 | [diff] [blame^] | 419 | * |
| 420 | * \note The f_rng_blind parameter must not be \c NULL. |
| 421 | * |
Manuel Pégourié-Gonnard | 4daaef7 | 2014-01-06 14:25:56 +0100 | [diff] [blame] | 422 | */ |
Manuel Pégourié-Gonnard | addb10e | 2017-04-21 12:54:46 +0200 | [diff] [blame] | 423 | static int ecdsa_sign_det_restartable( mbedtls_ecp_group *grp, |
| 424 | mbedtls_mpi *r, mbedtls_mpi *s, |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 425 | const mbedtls_mpi *d, const unsigned char *buf, size_t blen, |
Manuel Pégourié-Gonnard | addb10e | 2017-04-21 12:54:46 +0200 | [diff] [blame] | 426 | mbedtls_md_type_t md_alg, |
Janos Follath | dca667a | 2019-01-04 14:32:30 +0000 | [diff] [blame] | 427 | int (*f_rng_blind)(void *, unsigned char *, size_t), |
| 428 | void *p_rng_blind, |
Manuel Pégourié-Gonnard | addb10e | 2017-04-21 12:54:46 +0200 | [diff] [blame] | 429 | mbedtls_ecdsa_restart_ctx *rs_ctx ) |
Manuel Pégourié-Gonnard | 4daaef7 | 2014-01-06 14:25:56 +0100 | [diff] [blame] | 430 | { |
Janos Follath | 24eed8d | 2019-11-22 13:21:35 +0000 | [diff] [blame] | 431 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 432 | mbedtls_hmac_drbg_context rng_ctx; |
Manuel Pégourié-Gonnard | af081f5 | 2017-04-25 13:44:19 +0200 | [diff] [blame] | 433 | mbedtls_hmac_drbg_context *p_rng = &rng_ctx; |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 434 | unsigned char data[2 * MBEDTLS_ECP_MAX_BYTES]; |
Manuel Pégourié-Gonnard | 4daaef7 | 2014-01-06 14:25:56 +0100 | [diff] [blame] | 435 | size_t grp_len = ( grp->nbits + 7 ) / 8; |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 436 | const mbedtls_md_info_t *md_info; |
| 437 | mbedtls_mpi h; |
Manuel Pégourié-Gonnard | 4daaef7 | 2014-01-06 14:25:56 +0100 | [diff] [blame] | 438 | |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 439 | if( ( md_info = mbedtls_md_info_from_type( md_alg ) ) == NULL ) |
| 440 | return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA ); |
Manuel Pégourié-Gonnard | 4daaef7 | 2014-01-06 14:25:56 +0100 | [diff] [blame] | 441 | |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 442 | mbedtls_mpi_init( &h ); |
Manuel Pégourié-Gonnard | f9e9481 | 2015-04-28 22:07:14 +0200 | [diff] [blame] | 443 | mbedtls_hmac_drbg_init( &rng_ctx ); |
Manuel Pégourié-Gonnard | 4daaef7 | 2014-01-06 14:25:56 +0100 | [diff] [blame] | 444 | |
Manuel Pégourié-Gonnard | b90883d | 2017-04-25 11:33:10 +0200 | [diff] [blame] | 445 | ECDSA_RS_ENTER( det ); |
| 446 | |
| 447 | #if defined(MBEDTLS_ECP_RESTARTABLE) |
| 448 | if( rs_ctx != NULL && rs_ctx->det != NULL ) |
| 449 | { |
| 450 | /* redirect to our context */ |
Manuel Pégourié-Gonnard | af081f5 | 2017-04-25 13:44:19 +0200 | [diff] [blame] | 451 | p_rng = &rs_ctx->det->rng_ctx; |
Manuel Pégourié-Gonnard | b90883d | 2017-04-25 11:33:10 +0200 | [diff] [blame] | 452 | |
| 453 | /* jump to current step */ |
Manuel Pégourié-Gonnard | af081f5 | 2017-04-25 13:44:19 +0200 | [diff] [blame] | 454 | if( rs_ctx->det->state == ecdsa_det_sign ) |
| 455 | goto sign; |
Manuel Pégourié-Gonnard | b90883d | 2017-04-25 11:33:10 +0200 | [diff] [blame] | 456 | } |
| 457 | #endif /* MBEDTLS_ECP_RESTARTABLE */ |
| 458 | |
Manuel Pégourié-Gonnard | f42bca6 | 2014-01-06 15:05:01 +0100 | [diff] [blame] | 459 | /* Use private key and message hash (reduced) to initialize HMAC_DRBG */ |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 460 | MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( d, data, grp_len ) ); |
| 461 | MBEDTLS_MPI_CHK( derive_mpi( grp, &h, buf, blen ) ); |
| 462 | MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( &h, data + grp_len, grp_len ) ); |
Manuel Pégourié-Gonnard | af081f5 | 2017-04-25 13:44:19 +0200 | [diff] [blame] | 463 | mbedtls_hmac_drbg_seed_buf( p_rng, md_info, data, 2 * grp_len ); |
Manuel Pégourié-Gonnard | 4daaef7 | 2014-01-06 14:25:56 +0100 | [diff] [blame] | 464 | |
Manuel Pégourié-Gonnard | af081f5 | 2017-04-25 13:44:19 +0200 | [diff] [blame] | 465 | #if defined(MBEDTLS_ECP_RESTARTABLE) |
| 466 | if( rs_ctx != NULL && rs_ctx->det != NULL ) |
Manuel Pégourié-Gonnard | 6348181 | 2017-08-24 11:16:01 +0200 | [diff] [blame] | 467 | rs_ctx->det->state = ecdsa_det_sign; |
Manuel Pégourié-Gonnard | af081f5 | 2017-04-25 13:44:19 +0200 | [diff] [blame] | 468 | |
| 469 | sign: |
| 470 | #endif |
Ron Eldor | 8493f80 | 2018-11-01 11:32:15 +0200 | [diff] [blame] | 471 | #if defined(MBEDTLS_ECDSA_SIGN_ALT) |
| 472 | ret = mbedtls_ecdsa_sign( grp, r, s, d, buf, blen, |
| 473 | mbedtls_hmac_drbg_random, p_rng ); |
| 474 | #else |
TRodziewicz | 18efb73 | 2021-04-29 23:12:19 +0200 | [diff] [blame^] | 475 | ret = ecdsa_sign_restartable( grp, r, s, d, buf, blen, |
| 476 | mbedtls_hmac_drbg_random, p_rng, |
| 477 | f_rng_blind, p_rng_blind, rs_ctx ); |
Ron Eldor | 936d284 | 2018-11-01 13:05:52 +0200 | [diff] [blame] | 478 | #endif /* MBEDTLS_ECDSA_SIGN_ALT */ |
Manuel Pégourié-Gonnard | 4daaef7 | 2014-01-06 14:25:56 +0100 | [diff] [blame] | 479 | |
| 480 | cleanup: |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 481 | mbedtls_hmac_drbg_free( &rng_ctx ); |
| 482 | mbedtls_mpi_free( &h ); |
Manuel Pégourié-Gonnard | 4daaef7 | 2014-01-06 14:25:56 +0100 | [diff] [blame] | 483 | |
Manuel Pégourié-Gonnard | b90883d | 2017-04-25 11:33:10 +0200 | [diff] [blame] | 484 | ECDSA_RS_LEAVE( det ); |
| 485 | |
Manuel Pégourié-Gonnard | 4daaef7 | 2014-01-06 14:25:56 +0100 | [diff] [blame] | 486 | return( ret ); |
| 487 | } |
Manuel Pégourié-Gonnard | addb10e | 2017-04-21 12:54:46 +0200 | [diff] [blame] | 488 | |
| 489 | /* |
TRodziewicz | 18efb73 | 2021-04-29 23:12:19 +0200 | [diff] [blame^] | 490 | * Deterministic signature wrapper |
Manuel Pégourié-Gonnard | addb10e | 2017-04-21 12:54:46 +0200 | [diff] [blame] | 491 | */ |
Janos Follath | dca667a | 2019-01-04 14:32:30 +0000 | [diff] [blame] | 492 | int mbedtls_ecdsa_sign_det_ext( mbedtls_ecp_group *grp, mbedtls_mpi *r, |
| 493 | mbedtls_mpi *s, const mbedtls_mpi *d, |
| 494 | const unsigned char *buf, size_t blen, |
| 495 | mbedtls_md_type_t md_alg, |
| 496 | int (*f_rng_blind)(void *, unsigned char *, |
| 497 | size_t), |
| 498 | void *p_rng_blind ) |
| 499 | { |
| 500 | ECDSA_VALIDATE_RET( grp != NULL ); |
| 501 | ECDSA_VALIDATE_RET( r != NULL ); |
| 502 | ECDSA_VALIDATE_RET( s != NULL ); |
| 503 | ECDSA_VALIDATE_RET( d != NULL ); |
| 504 | ECDSA_VALIDATE_RET( buf != NULL || blen == 0 ); |
| 505 | ECDSA_VALIDATE_RET( f_rng_blind != NULL ); |
| 506 | |
| 507 | return( ecdsa_sign_det_restartable( grp, r, s, d, buf, blen, md_alg, |
| 508 | f_rng_blind, p_rng_blind, NULL ) ); |
Manuel Pégourié-Gonnard | addb10e | 2017-04-21 12:54:46 +0200 | [diff] [blame] | 509 | } |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 510 | #endif /* MBEDTLS_ECDSA_DETERMINISTIC */ |
Paul Bakker | 9f3c7d7 | 2014-01-23 16:11:14 +0100 | [diff] [blame] | 511 | |
Ron Eldor | 936d284 | 2018-11-01 13:05:52 +0200 | [diff] [blame] | 512 | #if !defined(MBEDTLS_ECDSA_VERIFY_ALT) |
Manuel Pégourié-Gonnard | 3aeb5a7 | 2013-01-26 18:05:50 +0100 | [diff] [blame] | 513 | /* |
| 514 | * Verify ECDSA signature of hashed message (SEC1 4.1.4) |
| 515 | * Obviously, compared to SEC1 4.1.3, we skip step 2 (hash message) |
| 516 | */ |
Manuel Pégourié-Gonnard | 32aa437 | 2017-04-21 10:29:13 +0200 | [diff] [blame] | 517 | static int ecdsa_verify_restartable( mbedtls_ecp_group *grp, |
| 518 | const unsigned char *buf, size_t blen, |
| 519 | const mbedtls_ecp_point *Q, |
| 520 | const mbedtls_mpi *r, const mbedtls_mpi *s, |
| 521 | mbedtls_ecdsa_restart_ctx *rs_ctx ) |
Manuel Pégourié-Gonnard | 3aeb5a7 | 2013-01-26 18:05:50 +0100 | [diff] [blame] | 522 | { |
Janos Follath | 24eed8d | 2019-11-22 13:21:35 +0000 | [diff] [blame] | 523 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 524 | mbedtls_mpi e, s_inv, u1, u2; |
Manuel Pégourié-Gonnard | 56cc88a | 2015-05-11 18:40:45 +0200 | [diff] [blame] | 525 | mbedtls_ecp_point R; |
Manuel Pégourié-Gonnard | 5314f23 | 2017-04-21 12:36:59 +0200 | [diff] [blame] | 526 | mbedtls_mpi *pu1 = &u1, *pu2 = &u2; |
Manuel Pégourié-Gonnard | 3aeb5a7 | 2013-01-26 18:05:50 +0100 | [diff] [blame] | 527 | |
Manuel Pégourié-Gonnard | 56cc88a | 2015-05-11 18:40:45 +0200 | [diff] [blame] | 528 | mbedtls_ecp_point_init( &R ); |
Manuel Pégourié-Gonnard | 411079f | 2017-04-20 15:41:08 +0200 | [diff] [blame] | 529 | mbedtls_mpi_init( &e ); mbedtls_mpi_init( &s_inv ); |
| 530 | mbedtls_mpi_init( &u1 ); mbedtls_mpi_init( &u2 ); |
Manuel Pégourié-Gonnard | 3aeb5a7 | 2013-01-26 18:05:50 +0100 | [diff] [blame] | 531 | |
Manuel Pégourié-Gonnard | 97871ef | 2013-12-04 20:52:04 +0100 | [diff] [blame] | 532 | /* Fail cleanly on curves such as Curve25519 that can't be used for ECDSA */ |
Christoph M. Wintersteiger | c25df68 | 2019-04-16 12:54:56 +0100 | [diff] [blame] | 533 | if( ! mbedtls_ecdsa_can_do( grp->id ) || grp->N.p == NULL ) |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 534 | return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA ); |
Manuel Pégourié-Gonnard | 97871ef | 2013-12-04 20:52:04 +0100 | [diff] [blame] | 535 | |
Manuel Pégourié-Gonnard | b90883d | 2017-04-25 11:33:10 +0200 | [diff] [blame] | 536 | ECDSA_RS_ENTER( ver ); |
| 537 | |
Manuel Pégourié-Gonnard | a0c5bcc | 2017-04-21 11:33:57 +0200 | [diff] [blame] | 538 | #if defined(MBEDTLS_ECP_RESTARTABLE) |
Manuel Pégourié-Gonnard | 5314f23 | 2017-04-21 12:36:59 +0200 | [diff] [blame] | 539 | if( rs_ctx != NULL && rs_ctx->ver != NULL ) |
| 540 | { |
| 541 | /* redirect to our context */ |
| 542 | pu1 = &rs_ctx->ver->u1; |
| 543 | pu2 = &rs_ctx->ver->u2; |
| 544 | |
| 545 | /* jump to current step */ |
| 546 | if( rs_ctx->ver->state == ecdsa_ver_muladd ) |
| 547 | goto muladd; |
| 548 | } |
Manuel Pégourié-Gonnard | a0c5bcc | 2017-04-21 11:33:57 +0200 | [diff] [blame] | 549 | #endif /* MBEDTLS_ECP_RESTARTABLE */ |
| 550 | |
Manuel Pégourié-Gonnard | 3aeb5a7 | 2013-01-26 18:05:50 +0100 | [diff] [blame] | 551 | /* |
| 552 | * Step 1: make sure r and s are in range 1..n-1 |
| 553 | */ |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 554 | if( mbedtls_mpi_cmp_int( r, 1 ) < 0 || mbedtls_mpi_cmp_mpi( r, &grp->N ) >= 0 || |
| 555 | mbedtls_mpi_cmp_int( s, 1 ) < 0 || mbedtls_mpi_cmp_mpi( s, &grp->N ) >= 0 ) |
Manuel Pégourié-Gonnard | 3aeb5a7 | 2013-01-26 18:05:50 +0100 | [diff] [blame] | 556 | { |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 557 | ret = MBEDTLS_ERR_ECP_VERIFY_FAILED; |
Paul Bakker | cca998a | 2013-07-26 14:20:53 +0200 | [diff] [blame] | 558 | goto cleanup; |
Manuel Pégourié-Gonnard | 3aeb5a7 | 2013-01-26 18:05:50 +0100 | [diff] [blame] | 559 | } |
| 560 | |
| 561 | /* |
Manuel Pégourié-Gonnard | 3aeb5a7 | 2013-01-26 18:05:50 +0100 | [diff] [blame] | 562 | * Step 3: derive MPI from hashed message |
| 563 | */ |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 564 | MBEDTLS_MPI_CHK( derive_mpi( grp, &e, buf, blen ) ); |
Manuel Pégourié-Gonnard | 3aeb5a7 | 2013-01-26 18:05:50 +0100 | [diff] [blame] | 565 | |
| 566 | /* |
| 567 | * Step 4: u1 = e / s mod n, u2 = r / s mod n |
| 568 | */ |
Manuel Pégourié-Gonnard | bfa1972 | 2017-08-23 17:39:18 +0200 | [diff] [blame] | 569 | ECDSA_BUDGET( MBEDTLS_ECP_OPS_CHK + MBEDTLS_ECP_OPS_INV + 2 ); |
| 570 | |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 571 | MBEDTLS_MPI_CHK( mbedtls_mpi_inv_mod( &s_inv, s, &grp->N ) ); |
Manuel Pégourié-Gonnard | 3aeb5a7 | 2013-01-26 18:05:50 +0100 | [diff] [blame] | 572 | |
Manuel Pégourié-Gonnard | 5314f23 | 2017-04-21 12:36:59 +0200 | [diff] [blame] | 573 | MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( pu1, &e, &s_inv ) ); |
| 574 | MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( pu1, pu1, &grp->N ) ); |
Manuel Pégourié-Gonnard | 3aeb5a7 | 2013-01-26 18:05:50 +0100 | [diff] [blame] | 575 | |
Manuel Pégourié-Gonnard | 5314f23 | 2017-04-21 12:36:59 +0200 | [diff] [blame] | 576 | MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( pu2, r, &s_inv ) ); |
| 577 | MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( pu2, pu2, &grp->N ) ); |
Manuel Pégourié-Gonnard | 3aeb5a7 | 2013-01-26 18:05:50 +0100 | [diff] [blame] | 578 | |
Manuel Pégourié-Gonnard | 5314f23 | 2017-04-21 12:36:59 +0200 | [diff] [blame] | 579 | #if defined(MBEDTLS_ECP_RESTARTABLE) |
| 580 | if( rs_ctx != NULL && rs_ctx->ver != NULL ) |
Manuel Pégourié-Gonnard | 6348181 | 2017-08-24 11:16:01 +0200 | [diff] [blame] | 581 | rs_ctx->ver->state = ecdsa_ver_muladd; |
Manuel Pégourié-Gonnard | 5314f23 | 2017-04-21 12:36:59 +0200 | [diff] [blame] | 582 | |
| 583 | muladd: |
| 584 | #endif |
Manuel Pégourié-Gonnard | 3aeb5a7 | 2013-01-26 18:05:50 +0100 | [diff] [blame] | 585 | /* |
| 586 | * Step 5: R = u1 G + u2 Q |
| 587 | */ |
Manuel Pégourié-Gonnard | a0c5bcc | 2017-04-21 11:33:57 +0200 | [diff] [blame] | 588 | MBEDTLS_MPI_CHK( mbedtls_ecp_muladd_restartable( grp, |
Manuel Pégourié-Gonnard | 5314f23 | 2017-04-21 12:36:59 +0200 | [diff] [blame] | 589 | &R, pu1, &grp->G, pu2, Q, ECDSA_RS_ECP ) ); |
Manuel Pégourié-Gonnard | 3aeb5a7 | 2013-01-26 18:05:50 +0100 | [diff] [blame] | 590 | |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 591 | if( mbedtls_ecp_is_zero( &R ) ) |
Paul Bakker | cca998a | 2013-07-26 14:20:53 +0200 | [diff] [blame] | 592 | { |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 593 | ret = MBEDTLS_ERR_ECP_VERIFY_FAILED; |
Paul Bakker | cca998a | 2013-07-26 14:20:53 +0200 | [diff] [blame] | 594 | goto cleanup; |
| 595 | } |
Manuel Pégourié-Gonnard | 3aeb5a7 | 2013-01-26 18:05:50 +0100 | [diff] [blame] | 596 | |
| 597 | /* |
Manuel Pégourié-Gonnard | 178d9ba | 2013-10-29 10:45:28 +0100 | [diff] [blame] | 598 | * Step 6: convert xR to an integer (no-op) |
| 599 | * Step 7: reduce xR mod n (gives v) |
| 600 | */ |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 601 | MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &R.X, &R.X, &grp->N ) ); |
Manuel Pégourié-Gonnard | 178d9ba | 2013-10-29 10:45:28 +0100 | [diff] [blame] | 602 | |
| 603 | /* |
| 604 | * Step 8: check if v (that is, R.X) is equal to r |
Manuel Pégourié-Gonnard | 3aeb5a7 | 2013-01-26 18:05:50 +0100 | [diff] [blame] | 605 | */ |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 606 | if( mbedtls_mpi_cmp_mpi( &R.X, r ) != 0 ) |
Paul Bakker | cca998a | 2013-07-26 14:20:53 +0200 | [diff] [blame] | 607 | { |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 608 | ret = MBEDTLS_ERR_ECP_VERIFY_FAILED; |
Paul Bakker | cca998a | 2013-07-26 14:20:53 +0200 | [diff] [blame] | 609 | goto cleanup; |
| 610 | } |
Manuel Pégourié-Gonnard | 3aeb5a7 | 2013-01-26 18:05:50 +0100 | [diff] [blame] | 611 | |
| 612 | cleanup: |
Manuel Pégourié-Gonnard | 56cc88a | 2015-05-11 18:40:45 +0200 | [diff] [blame] | 613 | mbedtls_ecp_point_free( &R ); |
Manuel Pégourié-Gonnard | 411079f | 2017-04-20 15:41:08 +0200 | [diff] [blame] | 614 | mbedtls_mpi_free( &e ); mbedtls_mpi_free( &s_inv ); |
| 615 | mbedtls_mpi_free( &u1 ); mbedtls_mpi_free( &u2 ); |
Manuel Pégourié-Gonnard | 3aeb5a7 | 2013-01-26 18:05:50 +0100 | [diff] [blame] | 616 | |
Manuel Pégourié-Gonnard | b90883d | 2017-04-25 11:33:10 +0200 | [diff] [blame] | 617 | ECDSA_RS_LEAVE( ver ); |
Manuel Pégourié-Gonnard | a0c5bcc | 2017-04-21 11:33:57 +0200 | [diff] [blame] | 618 | |
Manuel Pégourié-Gonnard | 3aeb5a7 | 2013-01-26 18:05:50 +0100 | [diff] [blame] | 619 | return( ret ); |
| 620 | } |
| 621 | |
Manuel Pégourié-Gonnard | 7c8934e | 2013-06-27 12:54:02 +0200 | [diff] [blame] | 622 | /* |
Manuel Pégourié-Gonnard | 32aa437 | 2017-04-21 10:29:13 +0200 | [diff] [blame] | 623 | * Verify ECDSA signature of hashed message |
| 624 | */ |
| 625 | int mbedtls_ecdsa_verify( mbedtls_ecp_group *grp, |
Hanno Becker | 319ae11 | 2018-12-14 16:43:29 +0000 | [diff] [blame] | 626 | const unsigned char *buf, size_t blen, |
| 627 | const mbedtls_ecp_point *Q, |
| 628 | const mbedtls_mpi *r, |
| 629 | const mbedtls_mpi *s) |
Manuel Pégourié-Gonnard | 32aa437 | 2017-04-21 10:29:13 +0200 | [diff] [blame] | 630 | { |
Hanno Becker | 319ae11 | 2018-12-14 16:43:29 +0000 | [diff] [blame] | 631 | ECDSA_VALIDATE_RET( grp != NULL ); |
| 632 | ECDSA_VALIDATE_RET( Q != NULL ); |
| 633 | ECDSA_VALIDATE_RET( r != NULL ); |
| 634 | ECDSA_VALIDATE_RET( s != NULL ); |
| 635 | ECDSA_VALIDATE_RET( buf != NULL || blen == 0 ); |
| 636 | |
Manuel Pégourié-Gonnard | 32aa437 | 2017-04-21 10:29:13 +0200 | [diff] [blame] | 637 | return( ecdsa_verify_restartable( grp, buf, blen, Q, r, s, NULL ) ); |
| 638 | } |
Ron Eldor | 936d284 | 2018-11-01 13:05:52 +0200 | [diff] [blame] | 639 | #endif /* !MBEDTLS_ECDSA_VERIFY_ALT */ |
Manuel Pégourié-Gonnard | 32aa437 | 2017-04-21 10:29:13 +0200 | [diff] [blame] | 640 | |
| 641 | /* |
Manuel Pégourié-Gonnard | 937340b | 2014-01-06 10:27:16 +0100 | [diff] [blame] | 642 | * Convert a signature (given by context) to ASN.1 |
Manuel Pégourié-Gonnard | b694b48 | 2013-08-08 13:30:57 +0200 | [diff] [blame] | 643 | */ |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 644 | static int ecdsa_signature_to_asn1( const mbedtls_mpi *r, const mbedtls_mpi *s, |
Manuel Pégourié-Gonnard | 937340b | 2014-01-06 10:27:16 +0100 | [diff] [blame] | 645 | unsigned char *sig, size_t *slen ) |
Manuel Pégourié-Gonnard | b694b48 | 2013-08-08 13:30:57 +0200 | [diff] [blame] | 646 | { |
Janos Follath | 24eed8d | 2019-11-22 13:21:35 +0000 | [diff] [blame] | 647 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 648 | unsigned char buf[MBEDTLS_ECDSA_MAX_LEN]; |
Manuel Pégourié-Gonnard | 4cf0686 | 2013-09-16 12:07:45 +0200 | [diff] [blame] | 649 | unsigned char *p = buf + sizeof( buf ); |
Manuel Pégourié-Gonnard | b694b48 | 2013-08-08 13:30:57 +0200 | [diff] [blame] | 650 | size_t len = 0; |
| 651 | |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 652 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &p, buf, s ) ); |
| 653 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &p, buf, r ) ); |
Manuel Pégourié-Gonnard | b694b48 | 2013-08-08 13:30:57 +0200 | [diff] [blame] | 654 | |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 655 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &p, buf, len ) ); |
| 656 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &p, buf, |
| 657 | MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ); |
Manuel Pégourié-Gonnard | b694b48 | 2013-08-08 13:30:57 +0200 | [diff] [blame] | 658 | |
| 659 | memcpy( sig, p, len ); |
| 660 | *slen = len; |
| 661 | |
| 662 | return( 0 ); |
| 663 | } |
| 664 | |
| 665 | /* |
Manuel Pégourié-Gonnard | 937340b | 2014-01-06 10:27:16 +0100 | [diff] [blame] | 666 | * Compute and write signature |
| 667 | */ |
Manuel Pégourié-Gonnard | addb10e | 2017-04-21 12:54:46 +0200 | [diff] [blame] | 668 | int mbedtls_ecdsa_write_signature_restartable( mbedtls_ecdsa_context *ctx, |
| 669 | mbedtls_md_type_t md_alg, |
Manuel Pégourié-Gonnard | 937340b | 2014-01-06 10:27:16 +0100 | [diff] [blame] | 670 | const unsigned char *hash, size_t hlen, |
| 671 | unsigned char *sig, size_t *slen, |
| 672 | int (*f_rng)(void *, unsigned char *, size_t), |
Manuel Pégourié-Gonnard | addb10e | 2017-04-21 12:54:46 +0200 | [diff] [blame] | 673 | void *p_rng, |
| 674 | mbedtls_ecdsa_restart_ctx *rs_ctx ) |
Manuel Pégourié-Gonnard | 937340b | 2014-01-06 10:27:16 +0100 | [diff] [blame] | 675 | { |
Janos Follath | 24eed8d | 2019-11-22 13:21:35 +0000 | [diff] [blame] | 676 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 677 | mbedtls_mpi r, s; |
TRodziewicz | 18efb73 | 2021-04-29 23:12:19 +0200 | [diff] [blame^] | 678 | ECDSA_VALIDATE_RET( ctx != NULL ); |
| 679 | ECDSA_VALIDATE_RET( hash != NULL ); |
| 680 | ECDSA_VALIDATE_RET( sig != NULL ); |
| 681 | ECDSA_VALIDATE_RET( slen != NULL ); |
| 682 | ECDSA_VALIDATE_RET( f_rng != NULL ); |
Manuel Pégourié-Gonnard | 8fce937 | 2015-03-31 13:06:41 +0200 | [diff] [blame] | 683 | |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 684 | mbedtls_mpi_init( &r ); |
| 685 | mbedtls_mpi_init( &s ); |
Manuel Pégourié-Gonnard | 937340b | 2014-01-06 10:27:16 +0100 | [diff] [blame] | 686 | |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 687 | #if defined(MBEDTLS_ECDSA_DETERMINISTIC) |
Manuel Pégourié-Gonnard | addb10e | 2017-04-21 12:54:46 +0200 | [diff] [blame] | 688 | MBEDTLS_MPI_CHK( ecdsa_sign_det_restartable( &ctx->grp, &r, &s, &ctx->d, |
Janos Follath | dca667a | 2019-01-04 14:32:30 +0000 | [diff] [blame] | 689 | hash, hlen, md_alg, f_rng, |
| 690 | p_rng, rs_ctx ) ); |
Manuel Pégourié-Gonnard | dfdcac9 | 2015-03-31 11:41:42 +0200 | [diff] [blame] | 691 | #else |
| 692 | (void) md_alg; |
| 693 | |
Ron Eldor | 8493f80 | 2018-11-01 11:32:15 +0200 | [diff] [blame] | 694 | #if defined(MBEDTLS_ECDSA_SIGN_ALT) |
| 695 | MBEDTLS_MPI_CHK( mbedtls_ecdsa_sign( &ctx->grp, &r, &s, &ctx->d, |
| 696 | hash, hlen, f_rng, p_rng ) ); |
| 697 | #else |
Janos Follath | dca667a | 2019-01-04 14:32:30 +0000 | [diff] [blame] | 698 | /* Use the same RNG for both blinding and ephemeral key generation */ |
Manuel Pégourié-Gonnard | addb10e | 2017-04-21 12:54:46 +0200 | [diff] [blame] | 699 | MBEDTLS_MPI_CHK( ecdsa_sign_restartable( &ctx->grp, &r, &s, &ctx->d, |
Janos Follath | dca667a | 2019-01-04 14:32:30 +0000 | [diff] [blame] | 700 | hash, hlen, f_rng, p_rng, f_rng, |
| 701 | p_rng, rs_ctx ) ); |
Ron Eldor | 936d284 | 2018-11-01 13:05:52 +0200 | [diff] [blame] | 702 | #endif /* MBEDTLS_ECDSA_SIGN_ALT */ |
Ron Eldor | 5ed8c1e | 2018-11-05 14:04:26 +0200 | [diff] [blame] | 703 | #endif /* MBEDTLS_ECDSA_DETERMINISTIC */ |
Manuel Pégourié-Gonnard | 937340b | 2014-01-06 10:27:16 +0100 | [diff] [blame] | 704 | |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 705 | MBEDTLS_MPI_CHK( ecdsa_signature_to_asn1( &r, &s, sig, slen ) ); |
Manuel Pégourié-Gonnard | 8fce937 | 2015-03-31 13:06:41 +0200 | [diff] [blame] | 706 | |
| 707 | cleanup: |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 708 | mbedtls_mpi_free( &r ); |
| 709 | mbedtls_mpi_free( &s ); |
Manuel Pégourié-Gonnard | 8fce937 | 2015-03-31 13:06:41 +0200 | [diff] [blame] | 710 | |
| 711 | return( ret ); |
Manuel Pégourié-Gonnard | 937340b | 2014-01-06 10:27:16 +0100 | [diff] [blame] | 712 | } |
| 713 | |
Manuel Pégourié-Gonnard | addb10e | 2017-04-21 12:54:46 +0200 | [diff] [blame] | 714 | /* |
| 715 | * Compute and write signature |
| 716 | */ |
Hanno Becker | 319ae11 | 2018-12-14 16:43:29 +0000 | [diff] [blame] | 717 | int mbedtls_ecdsa_write_signature( mbedtls_ecdsa_context *ctx, |
| 718 | mbedtls_md_type_t md_alg, |
| 719 | const unsigned char *hash, size_t hlen, |
| 720 | unsigned char *sig, size_t *slen, |
| 721 | int (*f_rng)(void *, unsigned char *, size_t), |
| 722 | void *p_rng ) |
Manuel Pégourié-Gonnard | addb10e | 2017-04-21 12:54:46 +0200 | [diff] [blame] | 723 | { |
Hanno Becker | 319ae11 | 2018-12-14 16:43:29 +0000 | [diff] [blame] | 724 | ECDSA_VALIDATE_RET( ctx != NULL ); |
| 725 | ECDSA_VALIDATE_RET( hash != NULL ); |
| 726 | ECDSA_VALIDATE_RET( sig != NULL ); |
| 727 | ECDSA_VALIDATE_RET( slen != NULL ); |
Manuel Pégourié-Gonnard | addb10e | 2017-04-21 12:54:46 +0200 | [diff] [blame] | 728 | return( mbedtls_ecdsa_write_signature_restartable( |
| 729 | ctx, md_alg, hash, hlen, sig, slen, f_rng, p_rng, NULL ) ); |
| 730 | } |
| 731 | |
Manuel Pégourié-Gonnard | 937340b | 2014-01-06 10:27:16 +0100 | [diff] [blame] | 732 | /* |
Manuel Pégourié-Gonnard | b694b48 | 2013-08-08 13:30:57 +0200 | [diff] [blame] | 733 | * Read and check signature |
| 734 | */ |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 735 | int mbedtls_ecdsa_read_signature( mbedtls_ecdsa_context *ctx, |
Manuel Pégourié-Gonnard | b694b48 | 2013-08-08 13:30:57 +0200 | [diff] [blame] | 736 | const unsigned char *hash, size_t hlen, |
| 737 | const unsigned char *sig, size_t slen ) |
| 738 | { |
Hanno Becker | 319ae11 | 2018-12-14 16:43:29 +0000 | [diff] [blame] | 739 | ECDSA_VALIDATE_RET( ctx != NULL ); |
| 740 | ECDSA_VALIDATE_RET( hash != NULL ); |
| 741 | ECDSA_VALIDATE_RET( sig != NULL ); |
Manuel Pégourié-Gonnard | 32aa437 | 2017-04-21 10:29:13 +0200 | [diff] [blame] | 742 | return( mbedtls_ecdsa_read_signature_restartable( |
| 743 | ctx, hash, hlen, sig, slen, NULL ) ); |
| 744 | } |
| 745 | |
| 746 | /* |
| 747 | * Restartable read and check signature |
| 748 | */ |
| 749 | int mbedtls_ecdsa_read_signature_restartable( mbedtls_ecdsa_context *ctx, |
| 750 | const unsigned char *hash, size_t hlen, |
| 751 | const unsigned char *sig, size_t slen, |
| 752 | mbedtls_ecdsa_restart_ctx *rs_ctx ) |
| 753 | { |
Janos Follath | 24eed8d | 2019-11-22 13:21:35 +0000 | [diff] [blame] | 754 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Manuel Pégourié-Gonnard | b694b48 | 2013-08-08 13:30:57 +0200 | [diff] [blame] | 755 | unsigned char *p = (unsigned char *) sig; |
| 756 | const unsigned char *end = sig + slen; |
| 757 | size_t len; |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 758 | mbedtls_mpi r, s; |
Hanno Becker | 319ae11 | 2018-12-14 16:43:29 +0000 | [diff] [blame] | 759 | ECDSA_VALIDATE_RET( ctx != NULL ); |
| 760 | ECDSA_VALIDATE_RET( hash != NULL ); |
| 761 | ECDSA_VALIDATE_RET( sig != NULL ); |
Manuel Pégourié-Gonnard | 8fce937 | 2015-03-31 13:06:41 +0200 | [diff] [blame] | 762 | |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 763 | mbedtls_mpi_init( &r ); |
| 764 | mbedtls_mpi_init( &s ); |
Manuel Pégourié-Gonnard | b694b48 | 2013-08-08 13:30:57 +0200 | [diff] [blame] | 765 | |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 766 | if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, |
| 767 | MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) |
Manuel Pégourié-Gonnard | b694b48 | 2013-08-08 13:30:57 +0200 | [diff] [blame] | 768 | { |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 769 | ret += MBEDTLS_ERR_ECP_BAD_INPUT_DATA; |
Manuel Pégourié-Gonnard | 8fce937 | 2015-03-31 13:06:41 +0200 | [diff] [blame] | 770 | goto cleanup; |
Manuel Pégourié-Gonnard | b694b48 | 2013-08-08 13:30:57 +0200 | [diff] [blame] | 771 | } |
| 772 | |
| 773 | if( p + len != end ) |
Manuel Pégourié-Gonnard | 8fce937 | 2015-03-31 13:06:41 +0200 | [diff] [blame] | 774 | { |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 775 | ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA + |
| 776 | MBEDTLS_ERR_ASN1_LENGTH_MISMATCH; |
Manuel Pégourié-Gonnard | 8fce937 | 2015-03-31 13:06:41 +0200 | [diff] [blame] | 777 | goto cleanup; |
| 778 | } |
Manuel Pégourié-Gonnard | b694b48 | 2013-08-08 13:30:57 +0200 | [diff] [blame] | 779 | |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 780 | if( ( ret = mbedtls_asn1_get_mpi( &p, end, &r ) ) != 0 || |
| 781 | ( ret = mbedtls_asn1_get_mpi( &p, end, &s ) ) != 0 ) |
Manuel Pégourié-Gonnard | 8fce937 | 2015-03-31 13:06:41 +0200 | [diff] [blame] | 782 | { |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 783 | ret += MBEDTLS_ERR_ECP_BAD_INPUT_DATA; |
Manuel Pégourié-Gonnard | 8fce937 | 2015-03-31 13:06:41 +0200 | [diff] [blame] | 784 | goto cleanup; |
| 785 | } |
Ron Eldor | 8493f80 | 2018-11-01 11:32:15 +0200 | [diff] [blame] | 786 | #if defined(MBEDTLS_ECDSA_VERIFY_ALT) |
| 787 | if( ( ret = mbedtls_ecdsa_verify( &ctx->grp, hash, hlen, |
| 788 | &ctx->Q, &r, &s ) ) != 0 ) |
| 789 | goto cleanup; |
| 790 | #else |
Manuel Pégourié-Gonnard | 32aa437 | 2017-04-21 10:29:13 +0200 | [diff] [blame] | 791 | if( ( ret = ecdsa_verify_restartable( &ctx->grp, hash, hlen, |
| 792 | &ctx->Q, &r, &s, rs_ctx ) ) != 0 ) |
Manuel Pégourié-Gonnard | 8fce937 | 2015-03-31 13:06:41 +0200 | [diff] [blame] | 793 | goto cleanup; |
Ron Eldor | 936d284 | 2018-11-01 13:05:52 +0200 | [diff] [blame] | 794 | #endif /* MBEDTLS_ECDSA_VERIFY_ALT */ |
Manuel Pégourié-Gonnard | b694b48 | 2013-08-08 13:30:57 +0200 | [diff] [blame] | 795 | |
Gilles Peskine | 5114d3e | 2018-03-30 07:12:15 +0200 | [diff] [blame] | 796 | /* At this point we know that the buffer starts with a valid signature. |
| 797 | * Return 0 if the buffer just contains the signature, and a specific |
| 798 | * error code if the valid signature is followed by more data. */ |
Manuel Pégourié-Gonnard | 35e95dd | 2014-04-08 12:17:41 +0200 | [diff] [blame] | 799 | if( p != end ) |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 800 | ret = MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH; |
Manuel Pégourié-Gonnard | 35e95dd | 2014-04-08 12:17:41 +0200 | [diff] [blame] | 801 | |
Manuel Pégourié-Gonnard | 8fce937 | 2015-03-31 13:06:41 +0200 | [diff] [blame] | 802 | cleanup: |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 803 | mbedtls_mpi_free( &r ); |
| 804 | mbedtls_mpi_free( &s ); |
Manuel Pégourié-Gonnard | 8fce937 | 2015-03-31 13:06:41 +0200 | [diff] [blame] | 805 | |
| 806 | return( ret ); |
Manuel Pégourié-Gonnard | b694b48 | 2013-08-08 13:30:57 +0200 | [diff] [blame] | 807 | } |
| 808 | |
Ron Eldor | 314adb6 | 2017-10-10 18:28:25 +0300 | [diff] [blame] | 809 | #if !defined(MBEDTLS_ECDSA_GENKEY_ALT) |
Manuel Pégourié-Gonnard | b694b48 | 2013-08-08 13:30:57 +0200 | [diff] [blame] | 810 | /* |
Manuel Pégourié-Gonnard | 8eebd01 | 2013-08-09 16:21:34 +0200 | [diff] [blame] | 811 | * Generate key pair |
| 812 | */ |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 813 | int mbedtls_ecdsa_genkey( mbedtls_ecdsa_context *ctx, mbedtls_ecp_group_id gid, |
Manuel Pégourié-Gonnard | 8eebd01 | 2013-08-09 16:21:34 +0200 | [diff] [blame] | 814 | int (*f_rng)(void *, unsigned char *, size_t), void *p_rng ) |
| 815 | { |
Ron Eldor | adb5234 | 2018-12-17 10:06:12 +0200 | [diff] [blame] | 816 | int ret = 0; |
Hanno Becker | 319ae11 | 2018-12-14 16:43:29 +0000 | [diff] [blame] | 817 | ECDSA_VALIDATE_RET( ctx != NULL ); |
| 818 | ECDSA_VALIDATE_RET( f_rng != NULL ); |
| 819 | |
Ron Eldor | adb5234 | 2018-12-17 10:06:12 +0200 | [diff] [blame] | 820 | ret = mbedtls_ecp_group_load( &ctx->grp, gid ); |
| 821 | if( ret != 0 ) |
| 822 | return( ret ); |
| 823 | |
| 824 | return( mbedtls_ecp_gen_keypair( &ctx->grp, &ctx->d, |
| 825 | &ctx->Q, f_rng, p_rng ) ); |
Manuel Pégourié-Gonnard | 8eebd01 | 2013-08-09 16:21:34 +0200 | [diff] [blame] | 826 | } |
Ron Eldor | 936d284 | 2018-11-01 13:05:52 +0200 | [diff] [blame] | 827 | #endif /* !MBEDTLS_ECDSA_GENKEY_ALT */ |
Manuel Pégourié-Gonnard | 8eebd01 | 2013-08-09 16:21:34 +0200 | [diff] [blame] | 828 | |
Manuel Pégourié-Gonnard | f499993 | 2013-08-12 17:02:59 +0200 | [diff] [blame] | 829 | /* |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 830 | * Set context from an mbedtls_ecp_keypair |
Manuel Pégourié-Gonnard | f499993 | 2013-08-12 17:02:59 +0200 | [diff] [blame] | 831 | */ |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 832 | int mbedtls_ecdsa_from_keypair( mbedtls_ecdsa_context *ctx, const mbedtls_ecp_keypair *key ) |
Manuel Pégourié-Gonnard | f499993 | 2013-08-12 17:02:59 +0200 | [diff] [blame] | 833 | { |
Janos Follath | 24eed8d | 2019-11-22 13:21:35 +0000 | [diff] [blame] | 834 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Hanno Becker | 319ae11 | 2018-12-14 16:43:29 +0000 | [diff] [blame] | 835 | ECDSA_VALIDATE_RET( ctx != NULL ); |
| 836 | ECDSA_VALIDATE_RET( key != NULL ); |
Manuel Pégourié-Gonnard | f499993 | 2013-08-12 17:02:59 +0200 | [diff] [blame] | 837 | |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 838 | if( ( ret = mbedtls_ecp_group_copy( &ctx->grp, &key->grp ) ) != 0 || |
| 839 | ( ret = mbedtls_mpi_copy( &ctx->d, &key->d ) ) != 0 || |
| 840 | ( ret = mbedtls_ecp_copy( &ctx->Q, &key->Q ) ) != 0 ) |
Manuel Pégourié-Gonnard | 1001e32 | 2013-10-27 14:53:48 +0100 | [diff] [blame] | 841 | { |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 842 | mbedtls_ecdsa_free( ctx ); |
Manuel Pégourié-Gonnard | 1001e32 | 2013-10-27 14:53:48 +0100 | [diff] [blame] | 843 | } |
Manuel Pégourié-Gonnard | f499993 | 2013-08-12 17:02:59 +0200 | [diff] [blame] | 844 | |
| 845 | return( ret ); |
| 846 | } |
Manuel Pégourié-Gonnard | 8eebd01 | 2013-08-09 16:21:34 +0200 | [diff] [blame] | 847 | |
| 848 | /* |
Manuel Pégourié-Gonnard | 7c8934e | 2013-06-27 12:54:02 +0200 | [diff] [blame] | 849 | * Initialize context |
| 850 | */ |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 851 | void mbedtls_ecdsa_init( mbedtls_ecdsa_context *ctx ) |
Manuel Pégourié-Gonnard | 7c8934e | 2013-06-27 12:54:02 +0200 | [diff] [blame] | 852 | { |
Hanno Becker | 319ae11 | 2018-12-14 16:43:29 +0000 | [diff] [blame] | 853 | ECDSA_VALIDATE( ctx != NULL ); |
| 854 | |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 855 | mbedtls_ecp_keypair_init( ctx ); |
Manuel Pégourié-Gonnard | 7c8934e | 2013-06-27 12:54:02 +0200 | [diff] [blame] | 856 | } |
| 857 | |
| 858 | /* |
| 859 | * Free context |
| 860 | */ |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 861 | void mbedtls_ecdsa_free( mbedtls_ecdsa_context *ctx ) |
Manuel Pégourié-Gonnard | 7c8934e | 2013-06-27 12:54:02 +0200 | [diff] [blame] | 862 | { |
Hanno Becker | 319ae11 | 2018-12-14 16:43:29 +0000 | [diff] [blame] | 863 | if( ctx == NULL ) |
| 864 | return; |
| 865 | |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 866 | mbedtls_ecp_keypair_free( ctx ); |
Manuel Pégourié-Gonnard | 7c8934e | 2013-06-27 12:54:02 +0200 | [diff] [blame] | 867 | } |
Manuel Pégourié-Gonnard | 3aeb5a7 | 2013-01-26 18:05:50 +0100 | [diff] [blame] | 868 | |
Manuel Pégourié-Gonnard | 32aa437 | 2017-04-21 10:29:13 +0200 | [diff] [blame] | 869 | #if defined(MBEDTLS_ECP_RESTARTABLE) |
| 870 | /* |
| 871 | * Initialize a restart context |
| 872 | */ |
| 873 | void mbedtls_ecdsa_restart_init( mbedtls_ecdsa_restart_ctx *ctx ) |
| 874 | { |
Hanno Becker | 319ae11 | 2018-12-14 16:43:29 +0000 | [diff] [blame] | 875 | ECDSA_VALIDATE( ctx != NULL ); |
| 876 | |
Manuel Pégourié-Gonnard | 722e515 | 2017-04-21 11:04:47 +0200 | [diff] [blame] | 877 | mbedtls_ecp_restart_init( &ctx->ecp ); |
Manuel Pégourié-Gonnard | a0c5bcc | 2017-04-21 11:33:57 +0200 | [diff] [blame] | 878 | |
| 879 | ctx->ver = NULL; |
Manuel Pégourié-Gonnard | b90883d | 2017-04-25 11:33:10 +0200 | [diff] [blame] | 880 | ctx->sig = NULL; |
| 881 | #if defined(MBEDTLS_ECDSA_DETERMINISTIC) |
| 882 | ctx->det = NULL; |
| 883 | #endif |
Manuel Pégourié-Gonnard | 32aa437 | 2017-04-21 10:29:13 +0200 | [diff] [blame] | 884 | } |
| 885 | |
| 886 | /* |
| 887 | * Free the components of a restart context |
| 888 | */ |
| 889 | void mbedtls_ecdsa_restart_free( mbedtls_ecdsa_restart_ctx *ctx ) |
| 890 | { |
Hanno Becker | 319ae11 | 2018-12-14 16:43:29 +0000 | [diff] [blame] | 891 | if( ctx == NULL ) |
| 892 | return; |
| 893 | |
Manuel Pégourié-Gonnard | 722e515 | 2017-04-21 11:04:47 +0200 | [diff] [blame] | 894 | mbedtls_ecp_restart_free( &ctx->ecp ); |
Manuel Pégourié-Gonnard | a0c5bcc | 2017-04-21 11:33:57 +0200 | [diff] [blame] | 895 | |
| 896 | ecdsa_restart_ver_free( ctx->ver ); |
| 897 | mbedtls_free( ctx->ver ); |
| 898 | ctx->ver = NULL; |
Manuel Pégourié-Gonnard | b90883d | 2017-04-25 11:33:10 +0200 | [diff] [blame] | 899 | |
| 900 | ecdsa_restart_sig_free( ctx->sig ); |
| 901 | mbedtls_free( ctx->sig ); |
| 902 | ctx->sig = NULL; |
| 903 | |
| 904 | #if defined(MBEDTLS_ECDSA_DETERMINISTIC) |
| 905 | ecdsa_restart_det_free( ctx->det ); |
| 906 | mbedtls_free( ctx->det ); |
| 907 | ctx->det = NULL; |
| 908 | #endif |
Manuel Pégourié-Gonnard | 32aa437 | 2017-04-21 10:29:13 +0200 | [diff] [blame] | 909 | } |
| 910 | #endif /* MBEDTLS_ECP_RESTARTABLE */ |
| 911 | |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 912 | #endif /* MBEDTLS_ECDSA_C */ |