Greg Steiert / pegasus_dev

Dependents:   blinky_max32630fthr

features/mbedtls/src/ecjpake.c@3:1198227e6421, 2016-12-16 (annotated)

Committer:
switches
Date:
Fri Dec 16 16:27:57 2016 +0000
Revision:
3:1198227e6421
Parent:
0:5c4d7b2438d3 
Changed ADC scale for MAX32625 platforms to 1.2V full scale to match MAX32630 platforms

Who changed what in which revision?

UserRevisionLine numberNew contents of line
switches 0:5c4d7b2438d3 1 /*
switches 0:5c4d7b2438d3 2 * Elliptic curve J-PAKE
switches 0:5c4d7b2438d3 3 *
switches 0:5c4d7b2438d3 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
switches 0:5c4d7b2438d3 5 * SPDX-License-Identifier: Apache-2.0
switches 0:5c4d7b2438d3 6 *
switches 0:5c4d7b2438d3 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
switches 0:5c4d7b2438d3 8 * not use this file except in compliance with the License.
switches 0:5c4d7b2438d3 9 * You may obtain a copy of the License at
switches 0:5c4d7b2438d3 10 *
switches 0:5c4d7b2438d3 11 * http://www.apache.org/licenses/LICENSE-2.0
switches 0:5c4d7b2438d3 12 *
switches 0:5c4d7b2438d3 13 * Unless required by applicable law or agreed to in writing, software
switches 0:5c4d7b2438d3 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
switches 0:5c4d7b2438d3 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
switches 0:5c4d7b2438d3 16 * See the License for the specific language governing permissions and
switches 0:5c4d7b2438d3 17 * limitations under the License.
switches 0:5c4d7b2438d3 18 *
switches 0:5c4d7b2438d3 19 * This file is part of mbed TLS (https://tls.mbed.org)
switches 0:5c4d7b2438d3 20 */
switches 0:5c4d7b2438d3 21
switches 0:5c4d7b2438d3 22 /*
switches 0:5c4d7b2438d3 23 * References in the code are to the Thread v1.0 Specification,
switches 0:5c4d7b2438d3 24 * available to members of the Thread Group http://threadgroup.org/
switches 0:5c4d7b2438d3 25 */
switches 0:5c4d7b2438d3 26
switches 0:5c4d7b2438d3 27 #if !defined(MBEDTLS_CONFIG_FILE)
switches 0:5c4d7b2438d3 28 #include "mbedtls/config.h"
switches 0:5c4d7b2438d3 29 #else
switches 0:5c4d7b2438d3 30 #include MBEDTLS_CONFIG_FILE
switches 0:5c4d7b2438d3 31 #endif
switches 0:5c4d7b2438d3 32
switches 0:5c4d7b2438d3 33 #if defined(MBEDTLS_ECJPAKE_C)
switches 0:5c4d7b2438d3 34
switches 0:5c4d7b2438d3 35 #include "mbedtls/ecjpake.h"
switches 0:5c4d7b2438d3 36
switches 0:5c4d7b2438d3 37 #include <string.h>
switches 0:5c4d7b2438d3 38
switches 0:5c4d7b2438d3 39 /*
switches 0:5c4d7b2438d3 40 * Convert a mbedtls_ecjpake_role to identifier string
switches 0:5c4d7b2438d3 41 */
switches 0:5c4d7b2438d3 42 static const char * const ecjpake_id[] = {
switches 0:5c4d7b2438d3 43 "client",
switches 0:5c4d7b2438d3 44 "server"
switches 0:5c4d7b2438d3 45 };
switches 0:5c4d7b2438d3 46
switches 0:5c4d7b2438d3 47 #define ID_MINE ( ecjpake_id[ ctx->role ] )
switches 0:5c4d7b2438d3 48 #define ID_PEER ( ecjpake_id[ 1 - ctx->role ] )
switches 0:5c4d7b2438d3 49
switches 0:5c4d7b2438d3 50 /*
switches 0:5c4d7b2438d3 51 * Initialize context
switches 0:5c4d7b2438d3 52 */
switches 0:5c4d7b2438d3 53 void mbedtls_ecjpake_init( mbedtls_ecjpake_context *ctx )
switches 0:5c4d7b2438d3 54 {
switches 0:5c4d7b2438d3 55 if( ctx == NULL )
switches 0:5c4d7b2438d3 56 return;
switches 0:5c4d7b2438d3 57
switches 0:5c4d7b2438d3 58 ctx->md_info = NULL;
switches 0:5c4d7b2438d3 59 mbedtls_ecp_group_init( &ctx->grp );
switches 0:5c4d7b2438d3 60 ctx->point_format = MBEDTLS_ECP_PF_UNCOMPRESSED;
switches 0:5c4d7b2438d3 61
switches 0:5c4d7b2438d3 62 mbedtls_ecp_point_init( &ctx->Xm1 );
switches 0:5c4d7b2438d3 63 mbedtls_ecp_point_init( &ctx->Xm2 );
switches 0:5c4d7b2438d3 64 mbedtls_ecp_point_init( &ctx->Xp1 );
switches 0:5c4d7b2438d3 65 mbedtls_ecp_point_init( &ctx->Xp2 );
switches 0:5c4d7b2438d3 66 mbedtls_ecp_point_init( &ctx->Xp );
switches 0:5c4d7b2438d3 67
switches 0:5c4d7b2438d3 68 mbedtls_mpi_init( &ctx->xm1 );
switches 0:5c4d7b2438d3 69 mbedtls_mpi_init( &ctx->xm2 );
switches 0:5c4d7b2438d3 70 mbedtls_mpi_init( &ctx->s );
switches 0:5c4d7b2438d3 71 }
switches 0:5c4d7b2438d3 72
switches 0:5c4d7b2438d3 73 /*
switches 0:5c4d7b2438d3 74 * Free context
switches 0:5c4d7b2438d3 75 */
switches 0:5c4d7b2438d3 76 void mbedtls_ecjpake_free( mbedtls_ecjpake_context *ctx )
switches 0:5c4d7b2438d3 77 {
switches 0:5c4d7b2438d3 78 if( ctx == NULL )
switches 0:5c4d7b2438d3 79 return;
switches 0:5c4d7b2438d3 80
switches 0:5c4d7b2438d3 81 ctx->md_info = NULL;
switches 0:5c4d7b2438d3 82 mbedtls_ecp_group_free( &ctx->grp );
switches 0:5c4d7b2438d3 83
switches 0:5c4d7b2438d3 84 mbedtls_ecp_point_free( &ctx->Xm1 );
switches 0:5c4d7b2438d3 85 mbedtls_ecp_point_free( &ctx->Xm2 );
switches 0:5c4d7b2438d3 86 mbedtls_ecp_point_free( &ctx->Xp1 );
switches 0:5c4d7b2438d3 87 mbedtls_ecp_point_free( &ctx->Xp2 );
switches 0:5c4d7b2438d3 88 mbedtls_ecp_point_free( &ctx->Xp );
switches 0:5c4d7b2438d3 89
switches 0:5c4d7b2438d3 90 mbedtls_mpi_free( &ctx->xm1 );
switches 0:5c4d7b2438d3 91 mbedtls_mpi_free( &ctx->xm2 );
switches 0:5c4d7b2438d3 92 mbedtls_mpi_free( &ctx->s );
switches 0:5c4d7b2438d3 93 }
switches 0:5c4d7b2438d3 94
switches 0:5c4d7b2438d3 95 /*
switches 0:5c4d7b2438d3 96 * Setup context
switches 0:5c4d7b2438d3 97 */
switches 0:5c4d7b2438d3 98 int mbedtls_ecjpake_setup( mbedtls_ecjpake_context *ctx,
switches 0:5c4d7b2438d3 99 mbedtls_ecjpake_role role,
switches 0:5c4d7b2438d3 100 mbedtls_md_type_t hash,
switches 0:5c4d7b2438d3 101 mbedtls_ecp_group_id curve,
switches 0:5c4d7b2438d3 102 const unsigned char *secret,
switches 0:5c4d7b2438d3 103 size_t len )
switches 0:5c4d7b2438d3 104 {
switches 0:5c4d7b2438d3 105 int ret;
switches 0:5c4d7b2438d3 106
switches 0:5c4d7b2438d3 107 ctx->role = role;
switches 0:5c4d7b2438d3 108
switches 0:5c4d7b2438d3 109 if( ( ctx->md_info = mbedtls_md_info_from_type( hash ) ) == NULL )
switches 0:5c4d7b2438d3 110 return( MBEDTLS_ERR_MD_FEATURE_UNAVAILABLE );
switches 0:5c4d7b2438d3 111
switches 0:5c4d7b2438d3 112 MBEDTLS_MPI_CHK( mbedtls_ecp_group_load( &ctx->grp, curve ) );
switches 0:5c4d7b2438d3 113
switches 0:5c4d7b2438d3 114 MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &ctx->s, secret, len ) );
switches 0:5c4d7b2438d3 115
switches 0:5c4d7b2438d3 116 cleanup:
switches 0:5c4d7b2438d3 117 if( ret != 0 )
switches 0:5c4d7b2438d3 118 mbedtls_ecjpake_free( ctx );
switches 0:5c4d7b2438d3 119
switches 0:5c4d7b2438d3 120 return( ret );
switches 0:5c4d7b2438d3 121 }
switches 0:5c4d7b2438d3 122
switches 0:5c4d7b2438d3 123 /*
switches 0:5c4d7b2438d3 124 * Check if context is ready for use
switches 0:5c4d7b2438d3 125 */
switches 0:5c4d7b2438d3 126 int mbedtls_ecjpake_check( const mbedtls_ecjpake_context *ctx )
switches 0:5c4d7b2438d3 127 {
switches 0:5c4d7b2438d3 128 if( ctx->md_info == NULL ||
switches 0:5c4d7b2438d3 129 ctx->grp.id == MBEDTLS_ECP_DP_NONE ||
switches 0:5c4d7b2438d3 130 ctx->s.p == NULL )
switches 0:5c4d7b2438d3 131 {
switches 0:5c4d7b2438d3 132 return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
switches 0:5c4d7b2438d3 133 }
switches 0:5c4d7b2438d3 134
switches 0:5c4d7b2438d3 135 return( 0 );
switches 0:5c4d7b2438d3 136 }
switches 0:5c4d7b2438d3 137
switches 0:5c4d7b2438d3 138 /*
switches 0:5c4d7b2438d3 139 * Write a point plus its length to a buffer
switches 0:5c4d7b2438d3 140 */
switches 0:5c4d7b2438d3 141 static int ecjpake_write_len_point( unsigned char **p,
switches 0:5c4d7b2438d3 142 const unsigned char *end,
switches 0:5c4d7b2438d3 143 const mbedtls_ecp_group *grp,
switches 0:5c4d7b2438d3 144 const int pf,
switches 0:5c4d7b2438d3 145 const mbedtls_ecp_point *P )
switches 0:5c4d7b2438d3 146 {
switches 0:5c4d7b2438d3 147 int ret;
switches 0:5c4d7b2438d3 148 size_t len;
switches 0:5c4d7b2438d3 149
switches 0:5c4d7b2438d3 150 /* Need at least 4 for length plus 1 for point */
switches 0:5c4d7b2438d3 151 if( end < *p || end - *p < 5 )
switches 0:5c4d7b2438d3 152 return( MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL );
switches 0:5c4d7b2438d3 153
switches 0:5c4d7b2438d3 154 ret = mbedtls_ecp_point_write_binary( grp, P, pf,
switches 0:5c4d7b2438d3 155 &len, *p + 4, end - ( *p + 4 ) );
switches 0:5c4d7b2438d3 156 if( ret != 0 )
switches 0:5c4d7b2438d3 157 return( ret );
switches 0:5c4d7b2438d3 158
switches 0:5c4d7b2438d3 159 (*p)[0] = (unsigned char)( ( len >> 24 ) & 0xFF );
switches 0:5c4d7b2438d3 160 (*p)[1] = (unsigned char)( ( len >> 16 ) & 0xFF );
switches 0:5c4d7b2438d3 161 (*p)[2] = (unsigned char)( ( len >> 8 ) & 0xFF );
switches 0:5c4d7b2438d3 162 (*p)[3] = (unsigned char)( ( len ) & 0xFF );
switches 0:5c4d7b2438d3 163
switches 0:5c4d7b2438d3 164 *p += 4 + len;
switches 0:5c4d7b2438d3 165
switches 0:5c4d7b2438d3 166 return( 0 );
switches 0:5c4d7b2438d3 167 }
switches 0:5c4d7b2438d3 168
switches 0:5c4d7b2438d3 169 /*
switches 0:5c4d7b2438d3 170 * Size of the temporary buffer for ecjpake_hash:
switches 0:5c4d7b2438d3 171 * 3 EC points plus their length, plus ID and its length (4 + 6 bytes)
switches 0:5c4d7b2438d3 172 */
switches 0:5c4d7b2438d3 173 #define ECJPAKE_HASH_BUF_LEN ( 3 * ( 4 + MBEDTLS_ECP_MAX_PT_LEN ) + 4 + 6 )
switches 0:5c4d7b2438d3 174
switches 0:5c4d7b2438d3 175 /*
switches 0:5c4d7b2438d3 176 * Compute hash for ZKP (7.4.2.2.2.1)
switches 0:5c4d7b2438d3 177 */
switches 0:5c4d7b2438d3 178 static int ecjpake_hash( const mbedtls_md_info_t *md_info,
switches 0:5c4d7b2438d3 179 const mbedtls_ecp_group *grp,
switches 0:5c4d7b2438d3 180 const int pf,
switches 0:5c4d7b2438d3 181 const mbedtls_ecp_point *G,
switches 0:5c4d7b2438d3 182 const mbedtls_ecp_point *V,
switches 0:5c4d7b2438d3 183 const mbedtls_ecp_point *X,
switches 0:5c4d7b2438d3 184 const char *id,
switches 0:5c4d7b2438d3 185 mbedtls_mpi *h )
switches 0:5c4d7b2438d3 186 {
switches 0:5c4d7b2438d3 187 int ret;
switches 0:5c4d7b2438d3 188 unsigned char buf[ECJPAKE_HASH_BUF_LEN];
switches 0:5c4d7b2438d3 189 unsigned char *p = buf;
switches 0:5c4d7b2438d3 190 const unsigned char *end = buf + sizeof( buf );
switches 0:5c4d7b2438d3 191 const size_t id_len = strlen( id );
switches 0:5c4d7b2438d3 192 unsigned char hash[MBEDTLS_MD_MAX_SIZE];
switches 0:5c4d7b2438d3 193
switches 0:5c4d7b2438d3 194 /* Write things to temporary buffer */
switches 0:5c4d7b2438d3 195 MBEDTLS_MPI_CHK( ecjpake_write_len_point( &p, end, grp, pf, G ) );
switches 0:5c4d7b2438d3 196 MBEDTLS_MPI_CHK( ecjpake_write_len_point( &p, end, grp, pf, V ) );
switches 0:5c4d7b2438d3 197 MBEDTLS_MPI_CHK( ecjpake_write_len_point( &p, end, grp, pf, X ) );
switches 0:5c4d7b2438d3 198
switches 0:5c4d7b2438d3 199 if( end - p < 4 )
switches 0:5c4d7b2438d3 200 return( MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL );
switches 0:5c4d7b2438d3 201
switches 0:5c4d7b2438d3 202 *p++ = (unsigned char)( ( id_len >> 24 ) & 0xFF );
switches 0:5c4d7b2438d3 203 *p++ = (unsigned char)( ( id_len >> 16 ) & 0xFF );
switches 0:5c4d7b2438d3 204 *p++ = (unsigned char)( ( id_len >> 8 ) & 0xFF );
switches 0:5c4d7b2438d3 205 *p++ = (unsigned char)( ( id_len ) & 0xFF );
switches 0:5c4d7b2438d3 206
switches 0:5c4d7b2438d3 207 if( end < p || (size_t)( end - p ) < id_len )
switches 0:5c4d7b2438d3 208 return( MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL );
switches 0:5c4d7b2438d3 209
switches 0:5c4d7b2438d3 210 memcpy( p, id, id_len );
switches 0:5c4d7b2438d3 211 p += id_len;
switches 0:5c4d7b2438d3 212
switches 0:5c4d7b2438d3 213 /* Compute hash */
switches 0:5c4d7b2438d3 214 mbedtls_md( md_info, buf, p - buf, hash );
switches 0:5c4d7b2438d3 215
switches 0:5c4d7b2438d3 216 /* Turn it into an integer mod n */
switches 0:5c4d7b2438d3 217 MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( h, hash,
switches 0:5c4d7b2438d3 218 mbedtls_md_get_size( md_info ) ) );
switches 0:5c4d7b2438d3 219 MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( h, h, &grp->N ) );
switches 0:5c4d7b2438d3 220
switches 0:5c4d7b2438d3 221 cleanup:
switches 0:5c4d7b2438d3 222 return( ret );
switches 0:5c4d7b2438d3 223 }
switches 0:5c4d7b2438d3 224
switches 0:5c4d7b2438d3 225 /*
switches 0:5c4d7b2438d3 226 * Parse a ECShnorrZKP (7.4.2.2.2) and verify it (7.4.2.3.3)
switches 0:5c4d7b2438d3 227 */
switches 0:5c4d7b2438d3 228 static int ecjpake_zkp_read( const mbedtls_md_info_t *md_info,
switches 0:5c4d7b2438d3 229 const mbedtls_ecp_group *grp,
switches 0:5c4d7b2438d3 230 const int pf,
switches 0:5c4d7b2438d3 231 const mbedtls_ecp_point *G,
switches 0:5c4d7b2438d3 232 const mbedtls_ecp_point *X,
switches 0:5c4d7b2438d3 233 const char *id,
switches 0:5c4d7b2438d3 234 const unsigned char **p,
switches 0:5c4d7b2438d3 235 const unsigned char *end )
switches 0:5c4d7b2438d3 236 {
switches 0:5c4d7b2438d3 237 int ret;
switches 0:5c4d7b2438d3 238 mbedtls_ecp_point V, VV;
switches 0:5c4d7b2438d3 239 mbedtls_mpi r, h;
switches 0:5c4d7b2438d3 240 size_t r_len;
switches 0:5c4d7b2438d3 241
switches 0:5c4d7b2438d3 242 mbedtls_ecp_point_init( &V );
switches 0:5c4d7b2438d3 243 mbedtls_ecp_point_init( &VV );
switches 0:5c4d7b2438d3 244 mbedtls_mpi_init( &r );
switches 0:5c4d7b2438d3 245 mbedtls_mpi_init( &h );
switches 0:5c4d7b2438d3 246
switches 0:5c4d7b2438d3 247 /*
switches 0:5c4d7b2438d3 248 * struct {
switches 0:5c4d7b2438d3 249 * ECPoint V;
switches 0:5c4d7b2438d3 250 * opaque r<1..2^8-1>;
switches 0:5c4d7b2438d3 251 * } ECSchnorrZKP;
switches 0:5c4d7b2438d3 252 */
switches 0:5c4d7b2438d3 253 if( end < *p )
switches 0:5c4d7b2438d3 254 return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
switches 0:5c4d7b2438d3 255
switches 0:5c4d7b2438d3 256 MBEDTLS_MPI_CHK( mbedtls_ecp_tls_read_point( grp, &V, p, end - *p ) );
switches 0:5c4d7b2438d3 257
switches 0:5c4d7b2438d3 258 if( end < *p || (size_t)( end - *p ) < 1 )
switches 0:5c4d7b2438d3 259 {
switches 0:5c4d7b2438d3 260 ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
switches 0:5c4d7b2438d3 261 goto cleanup;
switches 0:5c4d7b2438d3 262 }
switches 0:5c4d7b2438d3 263
switches 0:5c4d7b2438d3 264 r_len = *(*p)++;
switches 0:5c4d7b2438d3 265
switches 0:5c4d7b2438d3 266 if( end < *p || (size_t)( end - *p ) < r_len )
switches 0:5c4d7b2438d3 267 {
switches 0:5c4d7b2438d3 268 ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
switches 0:5c4d7b2438d3 269 goto cleanup;
switches 0:5c4d7b2438d3 270 }
switches 0:5c4d7b2438d3 271
switches 0:5c4d7b2438d3 272 MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &r, *p, r_len ) );
switches 0:5c4d7b2438d3 273 *p += r_len;
switches 0:5c4d7b2438d3 274
switches 0:5c4d7b2438d3 275 /*
switches 0:5c4d7b2438d3 276 * Verification
switches 0:5c4d7b2438d3 277 */
switches 0:5c4d7b2438d3 278 MBEDTLS_MPI_CHK( ecjpake_hash( md_info, grp, pf, G, &V, X, id, &h ) );
switches 0:5c4d7b2438d3 279 MBEDTLS_MPI_CHK( mbedtls_ecp_muladd( (mbedtls_ecp_group *) grp,
switches 0:5c4d7b2438d3 280 &VV, &h, X, &r, G ) );
switches 0:5c4d7b2438d3 281
switches 0:5c4d7b2438d3 282 if( mbedtls_ecp_point_cmp( &VV, &V ) != 0 )
switches 0:5c4d7b2438d3 283 {
switches 0:5c4d7b2438d3 284 ret = MBEDTLS_ERR_ECP_VERIFY_FAILED;
switches 0:5c4d7b2438d3 285 goto cleanup;
switches 0:5c4d7b2438d3 286 }
switches 0:5c4d7b2438d3 287
switches 0:5c4d7b2438d3 288 cleanup:
switches 0:5c4d7b2438d3 289 mbedtls_ecp_point_free( &V );
switches 0:5c4d7b2438d3 290 mbedtls_ecp_point_free( &VV );
switches 0:5c4d7b2438d3 291 mbedtls_mpi_free( &r );
switches 0:5c4d7b2438d3 292 mbedtls_mpi_free( &h );
switches 0:5c4d7b2438d3 293
switches 0:5c4d7b2438d3 294 return( ret );
switches 0:5c4d7b2438d3 295 }
switches 0:5c4d7b2438d3 296
switches 0:5c4d7b2438d3 297 /*
switches 0:5c4d7b2438d3 298 * Generate ZKP (7.4.2.3.2) and write it as ECSchnorrZKP (7.4.2.2.2)
switches 0:5c4d7b2438d3 299 */
switches 0:5c4d7b2438d3 300 static int ecjpake_zkp_write( const mbedtls_md_info_t *md_info,
switches 0:5c4d7b2438d3 301 const mbedtls_ecp_group *grp,
switches 0:5c4d7b2438d3 302 const int pf,
switches 0:5c4d7b2438d3 303 const mbedtls_ecp_point *G,
switches 0:5c4d7b2438d3 304 const mbedtls_mpi *x,
switches 0:5c4d7b2438d3 305 const mbedtls_ecp_point *X,
switches 0:5c4d7b2438d3 306 const char *id,
switches 0:5c4d7b2438d3 307 unsigned char **p,
switches 0:5c4d7b2438d3 308 const unsigned char *end,
switches 0:5c4d7b2438d3 309 int (*f_rng)(void *, unsigned char *, size_t),
switches 0:5c4d7b2438d3 310 void *p_rng )
switches 0:5c4d7b2438d3 311 {
switches 0:5c4d7b2438d3 312 int ret;
switches 0:5c4d7b2438d3 313 mbedtls_ecp_point V;
switches 0:5c4d7b2438d3 314 mbedtls_mpi v;
switches 0:5c4d7b2438d3 315 mbedtls_mpi h; /* later recycled to hold r */
switches 0:5c4d7b2438d3 316 size_t len;
switches 0:5c4d7b2438d3 317
switches 0:5c4d7b2438d3 318 if( end < *p )
switches 0:5c4d7b2438d3 319 return( MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL );
switches 0:5c4d7b2438d3 320
switches 0:5c4d7b2438d3 321 mbedtls_ecp_point_init( &V );
switches 0:5c4d7b2438d3 322 mbedtls_mpi_init( &v );
switches 0:5c4d7b2438d3 323 mbedtls_mpi_init( &h );
switches 0:5c4d7b2438d3 324
switches 0:5c4d7b2438d3 325 /* Compute signature */
switches 0:5c4d7b2438d3 326 MBEDTLS_MPI_CHK( mbedtls_ecp_gen_keypair_base( (mbedtls_ecp_group *) grp,
switches 0:5c4d7b2438d3 327 G, &v, &V, f_rng, p_rng ) );
switches 0:5c4d7b2438d3 328 MBEDTLS_MPI_CHK( ecjpake_hash( md_info, grp, pf, G, &V, X, id, &h ) );
switches 0:5c4d7b2438d3 329 MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &h, &h, x ) ); /* x*h */
switches 0:5c4d7b2438d3 330 MBEDTLS_MPI_CHK( mbedtls_mpi_sub_mpi( &h, &v, &h ) ); /* v - x*h */
switches 0:5c4d7b2438d3 331 MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &h, &h, &grp->N ) ); /* r */
switches 0:5c4d7b2438d3 332
switches 0:5c4d7b2438d3 333 /* Write it out */
switches 0:5c4d7b2438d3 334 MBEDTLS_MPI_CHK( mbedtls_ecp_tls_write_point( grp, &V,
switches 0:5c4d7b2438d3 335 pf, &len, *p, end - *p ) );
switches 0:5c4d7b2438d3 336 *p += len;
switches 0:5c4d7b2438d3 337
switches 0:5c4d7b2438d3 338 len = mbedtls_mpi_size( &h ); /* actually r */
switches 0:5c4d7b2438d3 339 if( end < *p || (size_t)( end - *p ) < 1 + len || len > 255 )
switches 0:5c4d7b2438d3 340 {
switches 0:5c4d7b2438d3 341 ret = MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL;
switches 0:5c4d7b2438d3 342 goto cleanup;
switches 0:5c4d7b2438d3 343 }
switches 0:5c4d7b2438d3 344
switches 0:5c4d7b2438d3 345 *(*p)++ = (unsigned char)( len & 0xFF );
switches 0:5c4d7b2438d3 346 MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( &h, *p, len ) ); /* r */
switches 0:5c4d7b2438d3 347 *p += len;
switches 0:5c4d7b2438d3 348
switches 0:5c4d7b2438d3 349 cleanup:
switches 0:5c4d7b2438d3 350 mbedtls_ecp_point_free( &V );
switches 0:5c4d7b2438d3 351 mbedtls_mpi_free( &v );
switches 0:5c4d7b2438d3 352 mbedtls_mpi_free( &h );
switches 0:5c4d7b2438d3 353
switches 0:5c4d7b2438d3 354 return( ret );
switches 0:5c4d7b2438d3 355 }
switches 0:5c4d7b2438d3 356
switches 0:5c4d7b2438d3 357 /*
switches 0:5c4d7b2438d3 358 * Parse a ECJPAKEKeyKP (7.4.2.2.1) and check proof
switches 0:5c4d7b2438d3 359 * Output: verified public key X
switches 0:5c4d7b2438d3 360 */
switches 0:5c4d7b2438d3 361 static int ecjpake_kkp_read( const mbedtls_md_info_t *md_info,
switches 0:5c4d7b2438d3 362 const mbedtls_ecp_group *grp,
switches 0:5c4d7b2438d3 363 const int pf,
switches 0:5c4d7b2438d3 364 const mbedtls_ecp_point *G,
switches 0:5c4d7b2438d3 365 mbedtls_ecp_point *X,
switches 0:5c4d7b2438d3 366 const char *id,
switches 0:5c4d7b2438d3 367 const unsigned char **p,
switches 0:5c4d7b2438d3 368 const unsigned char *end )
switches 0:5c4d7b2438d3 369 {
switches 0:5c4d7b2438d3 370 int ret;
switches 0:5c4d7b2438d3 371
switches 0:5c4d7b2438d3 372 if( end < *p )
switches 0:5c4d7b2438d3 373 return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
switches 0:5c4d7b2438d3 374
switches 0:5c4d7b2438d3 375 /*
switches 0:5c4d7b2438d3 376 * struct {
switches 0:5c4d7b2438d3 377 * ECPoint X;
switches 0:5c4d7b2438d3 378 * ECSchnorrZKP zkp;
switches 0:5c4d7b2438d3 379 * } ECJPAKEKeyKP;
switches 0:5c4d7b2438d3 380 */
switches 0:5c4d7b2438d3 381 MBEDTLS_MPI_CHK( mbedtls_ecp_tls_read_point( grp, X, p, end - *p ) );
switches 0:5c4d7b2438d3 382 if( mbedtls_ecp_is_zero( X ) )
switches 0:5c4d7b2438d3 383 {
switches 0:5c4d7b2438d3 384 ret = MBEDTLS_ERR_ECP_INVALID_KEY;
switches 0:5c4d7b2438d3 385 goto cleanup;
switches 0:5c4d7b2438d3 386 }
switches 0:5c4d7b2438d3 387
switches 0:5c4d7b2438d3 388 MBEDTLS_MPI_CHK( ecjpake_zkp_read( md_info, grp, pf, G, X, id, p, end ) );
switches 0:5c4d7b2438d3 389
switches 0:5c4d7b2438d3 390 cleanup:
switches 0:5c4d7b2438d3 391 return( ret );
switches 0:5c4d7b2438d3 392 }
switches 0:5c4d7b2438d3 393
switches 0:5c4d7b2438d3 394 /*
switches 0:5c4d7b2438d3 395 * Generate an ECJPAKEKeyKP
switches 0:5c4d7b2438d3 396 * Output: the serialized structure, plus private/public key pair
switches 0:5c4d7b2438d3 397 */
switches 0:5c4d7b2438d3 398 static int ecjpake_kkp_write( const mbedtls_md_info_t *md_info,
switches 0:5c4d7b2438d3 399 const mbedtls_ecp_group *grp,
switches 0:5c4d7b2438d3 400 const int pf,
switches 0:5c4d7b2438d3 401 const mbedtls_ecp_point *G,
switches 0:5c4d7b2438d3 402 mbedtls_mpi *x,
switches 0:5c4d7b2438d3 403 mbedtls_ecp_point *X,
switches 0:5c4d7b2438d3 404 const char *id,
switches 0:5c4d7b2438d3 405 unsigned char **p,
switches 0:5c4d7b2438d3 406 const unsigned char *end,
switches 0:5c4d7b2438d3 407 int (*f_rng)(void *, unsigned char *, size_t),
switches 0:5c4d7b2438d3 408 void *p_rng )
switches 0:5c4d7b2438d3 409 {
switches 0:5c4d7b2438d3 410 int ret;
switches 0:5c4d7b2438d3 411 size_t len;
switches 0:5c4d7b2438d3 412
switches 0:5c4d7b2438d3 413 if( end < *p )
switches 0:5c4d7b2438d3 414 return( MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL );
switches 0:5c4d7b2438d3 415
switches 0:5c4d7b2438d3 416 /* Generate key (7.4.2.3.1) and write it out */
switches 0:5c4d7b2438d3 417 MBEDTLS_MPI_CHK( mbedtls_ecp_gen_keypair_base( (mbedtls_ecp_group *) grp, G, x, X,
switches 0:5c4d7b2438d3 418 f_rng, p_rng ) );
switches 0:5c4d7b2438d3 419 MBEDTLS_MPI_CHK( mbedtls_ecp_tls_write_point( grp, X,
switches 0:5c4d7b2438d3 420 pf, &len, *p, end - *p ) );
switches 0:5c4d7b2438d3 421 *p += len;
switches 0:5c4d7b2438d3 422
switches 0:5c4d7b2438d3 423 /* Generate and write proof */
switches 0:5c4d7b2438d3 424 MBEDTLS_MPI_CHK( ecjpake_zkp_write( md_info, grp, pf, G, x, X, id,
switches 0:5c4d7b2438d3 425 p, end, f_rng, p_rng ) );
switches 0:5c4d7b2438d3 426
switches 0:5c4d7b2438d3 427 cleanup:
switches 0:5c4d7b2438d3 428 return( ret );
switches 0:5c4d7b2438d3 429 }
switches 0:5c4d7b2438d3 430
switches 0:5c4d7b2438d3 431 /*
switches 0:5c4d7b2438d3 432 * Read a ECJPAKEKeyKPPairList (7.4.2.3) and check proofs
switches 0:5c4d7b2438d3 433 * Ouputs: verified peer public keys Xa, Xb
switches 0:5c4d7b2438d3 434 */
switches 0:5c4d7b2438d3 435 static int ecjpake_kkpp_read( const mbedtls_md_info_t *md_info,
switches 0:5c4d7b2438d3 436 const mbedtls_ecp_group *grp,
switches 0:5c4d7b2438d3 437 const int pf,
switches 0:5c4d7b2438d3 438 const mbedtls_ecp_point *G,
switches 0:5c4d7b2438d3 439 mbedtls_ecp_point *Xa,
switches 0:5c4d7b2438d3 440 mbedtls_ecp_point *Xb,
switches 0:5c4d7b2438d3 441 const char *id,
switches 0:5c4d7b2438d3 442 const unsigned char *buf,
switches 0:5c4d7b2438d3 443 size_t len )
switches 0:5c4d7b2438d3 444 {
switches 0:5c4d7b2438d3 445 int ret;
switches 0:5c4d7b2438d3 446 const unsigned char *p = buf;
switches 0:5c4d7b2438d3 447 const unsigned char *end = buf + len;
switches 0:5c4d7b2438d3 448
switches 0:5c4d7b2438d3 449 /*
switches 0:5c4d7b2438d3 450 * struct {
switches 0:5c4d7b2438d3 451 * ECJPAKEKeyKP ecjpake_key_kp_pair_list[2];
switches 0:5c4d7b2438d3 452 * } ECJPAKEKeyKPPairList;
switches 0:5c4d7b2438d3 453 */
switches 0:5c4d7b2438d3 454 MBEDTLS_MPI_CHK( ecjpake_kkp_read( md_info, grp, pf, G, Xa, id, &p, end ) );
switches 0:5c4d7b2438d3 455 MBEDTLS_MPI_CHK( ecjpake_kkp_read( md_info, grp, pf, G, Xb, id, &p, end ) );
switches 0:5c4d7b2438d3 456
switches 0:5c4d7b2438d3 457 if( p != end )
switches 0:5c4d7b2438d3 458 ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
switches 0:5c4d7b2438d3 459
switches 0:5c4d7b2438d3 460 cleanup:
switches 0:5c4d7b2438d3 461 return( ret );
switches 0:5c4d7b2438d3 462 }
switches 0:5c4d7b2438d3 463
switches 0:5c4d7b2438d3 464 /*
switches 0:5c4d7b2438d3 465 * Generate a ECJPAKEKeyKPPairList
switches 0:5c4d7b2438d3 466 * Outputs: the serialized structure, plus two private/public key pairs
switches 0:5c4d7b2438d3 467 */
switches 0:5c4d7b2438d3 468 static int ecjpake_kkpp_write( const mbedtls_md_info_t *md_info,
switches 0:5c4d7b2438d3 469 const mbedtls_ecp_group *grp,
switches 0:5c4d7b2438d3 470 const int pf,
switches 0:5c4d7b2438d3 471 const mbedtls_ecp_point *G,
switches 0:5c4d7b2438d3 472 mbedtls_mpi *xm1,
switches 0:5c4d7b2438d3 473 mbedtls_ecp_point *Xa,
switches 0:5c4d7b2438d3 474 mbedtls_mpi *xm2,
switches 0:5c4d7b2438d3 475 mbedtls_ecp_point *Xb,
switches 0:5c4d7b2438d3 476 const char *id,
switches 0:5c4d7b2438d3 477 unsigned char *buf,
switches 0:5c4d7b2438d3 478 size_t len,
switches 0:5c4d7b2438d3 479 size_t *olen,
switches 0:5c4d7b2438d3 480 int (*f_rng)(void *, unsigned char *, size_t),
switches 0:5c4d7b2438d3 481 void *p_rng )
switches 0:5c4d7b2438d3 482 {
switches 0:5c4d7b2438d3 483 int ret;
switches 0:5c4d7b2438d3 484 unsigned char *p = buf;
switches 0:5c4d7b2438d3 485 const unsigned char *end = buf + len;
switches 0:5c4d7b2438d3 486
switches 0:5c4d7b2438d3 487 MBEDTLS_MPI_CHK( ecjpake_kkp_write( md_info, grp, pf, G, xm1, Xa, id,
switches 0:5c4d7b2438d3 488 &p, end, f_rng, p_rng ) );
switches 0:5c4d7b2438d3 489 MBEDTLS_MPI_CHK( ecjpake_kkp_write( md_info, grp, pf, G, xm2, Xb, id,
switches 0:5c4d7b2438d3 490 &p, end, f_rng, p_rng ) );
switches 0:5c4d7b2438d3 491
switches 0:5c4d7b2438d3 492 *olen = p - buf;
switches 0:5c4d7b2438d3 493
switches 0:5c4d7b2438d3 494 cleanup:
switches 0:5c4d7b2438d3 495 return( ret );
switches 0:5c4d7b2438d3 496 }
switches 0:5c4d7b2438d3 497
switches 0:5c4d7b2438d3 498 /*
switches 0:5c4d7b2438d3 499 * Read and process the first round message
switches 0:5c4d7b2438d3 500 */
switches 0:5c4d7b2438d3 501 int mbedtls_ecjpake_read_round_one( mbedtls_ecjpake_context *ctx,
switches 0:5c4d7b2438d3 502 const unsigned char *buf,
switches 0:5c4d7b2438d3 503 size_t len )
switches 0:5c4d7b2438d3 504 {
switches 0:5c4d7b2438d3 505 return( ecjpake_kkpp_read( ctx->md_info, &ctx->grp, ctx->point_format,
switches 0:5c4d7b2438d3 506 &ctx->grp.G,
switches 0:5c4d7b2438d3 507 &ctx->Xp1, &ctx->Xp2, ID_PEER,
switches 0:5c4d7b2438d3 508 buf, len ) );
switches 0:5c4d7b2438d3 509 }
switches 0:5c4d7b2438d3 510
switches 0:5c4d7b2438d3 511 /*
switches 0:5c4d7b2438d3 512 * Generate and write the first round message
switches 0:5c4d7b2438d3 513 */
switches 0:5c4d7b2438d3 514 int mbedtls_ecjpake_write_round_one( mbedtls_ecjpake_context *ctx,
switches 0:5c4d7b2438d3 515 unsigned char *buf, size_t len, size_t *olen,
switches 0:5c4d7b2438d3 516 int (*f_rng)(void *, unsigned char *, size_t),
switches 0:5c4d7b2438d3 517 void *p_rng )
switches 0:5c4d7b2438d3 518 {
switches 0:5c4d7b2438d3 519 return( ecjpake_kkpp_write( ctx->md_info, &ctx->grp, ctx->point_format,
switches 0:5c4d7b2438d3 520 &ctx->grp.G,
switches 0:5c4d7b2438d3 521 &ctx->xm1, &ctx->Xm1, &ctx->xm2, &ctx->Xm2,
switches 0:5c4d7b2438d3 522 ID_MINE, buf, len, olen, f_rng, p_rng ) );
switches 0:5c4d7b2438d3 523 }
switches 0:5c4d7b2438d3 524
switches 0:5c4d7b2438d3 525 /*
switches 0:5c4d7b2438d3 526 * Compute the sum of three points R = A + B + C
switches 0:5c4d7b2438d3 527 */
switches 0:5c4d7b2438d3 528 static int ecjpake_ecp_add3( mbedtls_ecp_group *grp, mbedtls_ecp_point *R,
switches 0:5c4d7b2438d3 529 const mbedtls_ecp_point *A,
switches 0:5c4d7b2438d3 530 const mbedtls_ecp_point *B,
switches 0:5c4d7b2438d3 531 const mbedtls_ecp_point *C )
switches 0:5c4d7b2438d3 532 {
switches 0:5c4d7b2438d3 533 int ret;
switches 0:5c4d7b2438d3 534 mbedtls_mpi one;
switches 0:5c4d7b2438d3 535
switches 0:5c4d7b2438d3 536 mbedtls_mpi_init( &one );
switches 0:5c4d7b2438d3 537
switches 0:5c4d7b2438d3 538 MBEDTLS_MPI_CHK( mbedtls_mpi_lset( &one, 1 ) );
switches 0:5c4d7b2438d3 539 MBEDTLS_MPI_CHK( mbedtls_ecp_muladd( grp, R, &one, A, &one, B ) );
switches 0:5c4d7b2438d3 540 MBEDTLS_MPI_CHK( mbedtls_ecp_muladd( grp, R, &one, R, &one, C ) );
switches 0:5c4d7b2438d3 541
switches 0:5c4d7b2438d3 542 cleanup:
switches 0:5c4d7b2438d3 543 mbedtls_mpi_free( &one );
switches 0:5c4d7b2438d3 544
switches 0:5c4d7b2438d3 545 return( ret );
switches 0:5c4d7b2438d3 546 }
switches 0:5c4d7b2438d3 547
switches 0:5c4d7b2438d3 548 /*
switches 0:5c4d7b2438d3 549 * Read and process second round message (C: 7.4.2.5, S: 7.4.2.6)
switches 0:5c4d7b2438d3 550 */
switches 0:5c4d7b2438d3 551 int mbedtls_ecjpake_read_round_two( mbedtls_ecjpake_context *ctx,
switches 0:5c4d7b2438d3 552 const unsigned char *buf,
switches 0:5c4d7b2438d3 553 size_t len )
switches 0:5c4d7b2438d3 554 {
switches 0:5c4d7b2438d3 555 int ret;
switches 0:5c4d7b2438d3 556 const unsigned char *p = buf;
switches 0:5c4d7b2438d3 557 const unsigned char *end = buf + len;
switches 0:5c4d7b2438d3 558 mbedtls_ecp_group grp;
switches 0:5c4d7b2438d3 559 mbedtls_ecp_point G; /* C: GB, S: GA */
switches 0:5c4d7b2438d3 560
switches 0:5c4d7b2438d3 561 mbedtls_ecp_group_init( &grp );
switches 0:5c4d7b2438d3 562 mbedtls_ecp_point_init( &G );
switches 0:5c4d7b2438d3 563
switches 0:5c4d7b2438d3 564 /*
switches 0:5c4d7b2438d3 565 * Server: GA = X3 + X4 + X1 (7.4.2.6.1)
switches 0:5c4d7b2438d3 566 * Client: GB = X1 + X2 + X3 (7.4.2.5.1)
switches 0:5c4d7b2438d3 567 * Unified: G = Xm1 + Xm2 + Xp1
switches 0:5c4d7b2438d3 568 * We need that before parsing in order to check Xp as we read it
switches 0:5c4d7b2438d3 569 */
switches 0:5c4d7b2438d3 570 MBEDTLS_MPI_CHK( ecjpake_ecp_add3( &ctx->grp, &G,
switches 0:5c4d7b2438d3 571 &ctx->Xm1, &ctx->Xm2, &ctx->Xp1 ) );
switches 0:5c4d7b2438d3 572
switches 0:5c4d7b2438d3 573 /*
switches 0:5c4d7b2438d3 574 * struct {
switches 0:5c4d7b2438d3 575 * ECParameters curve_params; // only client reading server msg
switches 0:5c4d7b2438d3 576 * ECJPAKEKeyKP ecjpake_key_kp;
switches 0:5c4d7b2438d3 577 * } Client/ServerECJPAKEParams;
switches 0:5c4d7b2438d3 578 */
switches 0:5c4d7b2438d3 579 if( ctx->role == MBEDTLS_ECJPAKE_CLIENT )
switches 0:5c4d7b2438d3 580 {
switches 0:5c4d7b2438d3 581 MBEDTLS_MPI_CHK( mbedtls_ecp_tls_read_group( &grp, &p, len ) );
switches 0:5c4d7b2438d3 582 if( grp.id != ctx->grp.id )
switches 0:5c4d7b2438d3 583 {
switches 0:5c4d7b2438d3 584 ret = MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE;
switches 0:5c4d7b2438d3 585 goto cleanup;
switches 0:5c4d7b2438d3 586 }
switches 0:5c4d7b2438d3 587 }
switches 0:5c4d7b2438d3 588
switches 0:5c4d7b2438d3 589 MBEDTLS_MPI_CHK( ecjpake_kkp_read( ctx->md_info, &ctx->grp,
switches 0:5c4d7b2438d3 590 ctx->point_format,
switches 0:5c4d7b2438d3 591 &G, &ctx->Xp, ID_PEER, &p, end ) );
switches 0:5c4d7b2438d3 592
switches 0:5c4d7b2438d3 593 if( p != end )
switches 0:5c4d7b2438d3 594 {
switches 0:5c4d7b2438d3 595 ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
switches 0:5c4d7b2438d3 596 goto cleanup;
switches 0:5c4d7b2438d3 597 }
switches 0:5c4d7b2438d3 598
switches 0:5c4d7b2438d3 599 cleanup:
switches 0:5c4d7b2438d3 600 mbedtls_ecp_group_free( &grp );
switches 0:5c4d7b2438d3 601 mbedtls_ecp_point_free( &G );
switches 0:5c4d7b2438d3 602
switches 0:5c4d7b2438d3 603 return( ret );
switches 0:5c4d7b2438d3 604 }
switches 0:5c4d7b2438d3 605
switches 0:5c4d7b2438d3 606 /*
switches 0:5c4d7b2438d3 607 * Compute R = +/- X * S mod N, taking care not to leak S
switches 0:5c4d7b2438d3 608 */
switches 0:5c4d7b2438d3 609 static int ecjpake_mul_secret( mbedtls_mpi *R, int sign,
switches 0:5c4d7b2438d3 610 const mbedtls_mpi *X,
switches 0:5c4d7b2438d3 611 const mbedtls_mpi *S,
switches 0:5c4d7b2438d3 612 const mbedtls_mpi *N,
switches 0:5c4d7b2438d3 613 int (*f_rng)(void *, unsigned char *, size_t),
switches 0:5c4d7b2438d3 614 void *p_rng )
switches 0:5c4d7b2438d3 615 {
switches 0:5c4d7b2438d3 616 int ret;
switches 0:5c4d7b2438d3 617 mbedtls_mpi b; /* Blinding value, then s + N * blinding */
switches 0:5c4d7b2438d3 618
switches 0:5c4d7b2438d3 619 mbedtls_mpi_init( &b );
switches 0:5c4d7b2438d3 620
switches 0:5c4d7b2438d3 621 /* b = s + rnd-128-bit * N */
switches 0:5c4d7b2438d3 622 MBEDTLS_MPI_CHK( mbedtls_mpi_fill_random( &b, 16, f_rng, p_rng ) );
switches 0:5c4d7b2438d3 623 MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &b, &b, N ) );
switches 0:5c4d7b2438d3 624 MBEDTLS_MPI_CHK( mbedtls_mpi_add_mpi( &b, &b, S ) );
switches 0:5c4d7b2438d3 625
switches 0:5c4d7b2438d3 626 /* R = sign * X * b mod N */
switches 0:5c4d7b2438d3 627 MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( R, X, &b ) );
switches 0:5c4d7b2438d3 628 R->s *= sign;
switches 0:5c4d7b2438d3 629 MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( R, R, N ) );
switches 0:5c4d7b2438d3 630
switches 0:5c4d7b2438d3 631 cleanup:
switches 0:5c4d7b2438d3 632 mbedtls_mpi_free( &b );
switches 0:5c4d7b2438d3 633
switches 0:5c4d7b2438d3 634 return( ret );
switches 0:5c4d7b2438d3 635 }
switches 0:5c4d7b2438d3 636
switches 0:5c4d7b2438d3 637 /*
switches 0:5c4d7b2438d3 638 * Generate and write the second round message (S: 7.4.2.5, C: 7.4.2.6)
switches 0:5c4d7b2438d3 639 */
switches 0:5c4d7b2438d3 640 int mbedtls_ecjpake_write_round_two( mbedtls_ecjpake_context *ctx,
switches 0:5c4d7b2438d3 641 unsigned char *buf, size_t len, size_t *olen,
switches 0:5c4d7b2438d3 642 int (*f_rng)(void *, unsigned char *, size_t),
switches 0:5c4d7b2438d3 643 void *p_rng )
switches 0:5c4d7b2438d3 644 {
switches 0:5c4d7b2438d3 645 int ret;
switches 0:5c4d7b2438d3 646 mbedtls_ecp_point G; /* C: GA, S: GB */
switches 0:5c4d7b2438d3 647 mbedtls_ecp_point Xm; /* C: Xc, S: Xs */
switches 0:5c4d7b2438d3 648 mbedtls_mpi xm; /* C: xc, S: xs */
switches 0:5c4d7b2438d3 649 unsigned char *p = buf;
switches 0:5c4d7b2438d3 650 const unsigned char *end = buf + len;
switches 0:5c4d7b2438d3 651 size_t ec_len;
switches 0:5c4d7b2438d3 652
switches 0:5c4d7b2438d3 653 mbedtls_ecp_point_init( &G );
switches 0:5c4d7b2438d3 654 mbedtls_ecp_point_init( &Xm );
switches 0:5c4d7b2438d3 655 mbedtls_mpi_init( &xm );
switches 0:5c4d7b2438d3 656
switches 0:5c4d7b2438d3 657 /*
switches 0:5c4d7b2438d3 658 * First generate private/public key pair (S: 7.4.2.5.1, C: 7.4.2.6.1)
switches 0:5c4d7b2438d3 659 *
switches 0:5c4d7b2438d3 660 * Client: GA = X1 + X3 + X4 | xs = x2 * s | Xc = xc * GA
switches 0:5c4d7b2438d3 661 * Server: GB = X3 + X1 + X2 | xs = x4 * s | Xs = xs * GB
switches 0:5c4d7b2438d3 662 * Unified: G = Xm1 + Xp1 + Xp2 | xm = xm2 * s | Xm = xm * G
switches 0:5c4d7b2438d3 663 */
switches 0:5c4d7b2438d3 664 MBEDTLS_MPI_CHK( ecjpake_ecp_add3( &ctx->grp, &G,
switches 0:5c4d7b2438d3 665 &ctx->Xp1, &ctx->Xp2, &ctx->Xm1 ) );
switches 0:5c4d7b2438d3 666 MBEDTLS_MPI_CHK( ecjpake_mul_secret( &xm, 1, &ctx->xm2, &ctx->s,
switches 0:5c4d7b2438d3 667 &ctx->grp.N, f_rng, p_rng ) );
switches 0:5c4d7b2438d3 668 MBEDTLS_MPI_CHK( mbedtls_ecp_mul( &ctx->grp, &Xm, &xm, &G, f_rng, p_rng ) );
switches 0:5c4d7b2438d3 669
switches 0:5c4d7b2438d3 670 /*
switches 0:5c4d7b2438d3 671 * Now write things out
switches 0:5c4d7b2438d3 672 *
switches 0:5c4d7b2438d3 673 * struct {
switches 0:5c4d7b2438d3 674 * ECParameters curve_params; // only server writing its message
switches 0:5c4d7b2438d3 675 * ECJPAKEKeyKP ecjpake_key_kp;
switches 0:5c4d7b2438d3 676 * } Client/ServerECJPAKEParams;
switches 0:5c4d7b2438d3 677 */
switches 0:5c4d7b2438d3 678 if( ctx->role == MBEDTLS_ECJPAKE_SERVER )
switches 0:5c4d7b2438d3 679 {
switches 0:5c4d7b2438d3 680 if( end < p )
switches 0:5c4d7b2438d3 681 {
switches 0:5c4d7b2438d3 682 ret = MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL;
switches 0:5c4d7b2438d3 683 goto cleanup;
switches 0:5c4d7b2438d3 684 }
switches 0:5c4d7b2438d3 685 MBEDTLS_MPI_CHK( mbedtls_ecp_tls_write_group( &ctx->grp, &ec_len,
switches 0:5c4d7b2438d3 686 p, end - p ) );
switches 0:5c4d7b2438d3 687 p += ec_len;
switches 0:5c4d7b2438d3 688 }
switches 0:5c4d7b2438d3 689
switches 0:5c4d7b2438d3 690 if( end < p )
switches 0:5c4d7b2438d3 691 {
switches 0:5c4d7b2438d3 692 ret = MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL;
switches 0:5c4d7b2438d3 693 goto cleanup;
switches 0:5c4d7b2438d3 694 }
switches 0:5c4d7b2438d3 695 MBEDTLS_MPI_CHK( mbedtls_ecp_tls_write_point( &ctx->grp, &Xm,
switches 0:5c4d7b2438d3 696 ctx->point_format, &ec_len, p, end - p ) );
switches 0:5c4d7b2438d3 697 p += ec_len;
switches 0:5c4d7b2438d3 698
switches 0:5c4d7b2438d3 699 MBEDTLS_MPI_CHK( ecjpake_zkp_write( ctx->md_info, &ctx->grp,
switches 0:5c4d7b2438d3 700 ctx->point_format,
switches 0:5c4d7b2438d3 701 &G, &xm, &Xm, ID_MINE,
switches 0:5c4d7b2438d3 702 &p, end, f_rng, p_rng ) );
switches 0:5c4d7b2438d3 703
switches 0:5c4d7b2438d3 704 *olen = p - buf;
switches 0:5c4d7b2438d3 705
switches 0:5c4d7b2438d3 706 cleanup:
switches 0:5c4d7b2438d3 707 mbedtls_ecp_point_free( &G );
switches 0:5c4d7b2438d3 708 mbedtls_ecp_point_free( &Xm );
switches 0:5c4d7b2438d3 709 mbedtls_mpi_free( &xm );
switches 0:5c4d7b2438d3 710
switches 0:5c4d7b2438d3 711 return( ret );
switches 0:5c4d7b2438d3 712 }
switches 0:5c4d7b2438d3 713
switches 0:5c4d7b2438d3 714 /*
switches 0:5c4d7b2438d3 715 * Derive PMS (7.4.2.7 / 7.4.2.8)
switches 0:5c4d7b2438d3 716 */
switches 0:5c4d7b2438d3 717 int mbedtls_ecjpake_derive_secret( mbedtls_ecjpake_context *ctx,
switches 0:5c4d7b2438d3 718 unsigned char *buf, size_t len, size_t *olen,
switches 0:5c4d7b2438d3 719 int (*f_rng)(void *, unsigned char *, size_t),
switches 0:5c4d7b2438d3 720 void *p_rng )
switches 0:5c4d7b2438d3 721 {
switches 0:5c4d7b2438d3 722 int ret;
switches 0:5c4d7b2438d3 723 mbedtls_ecp_point K;
switches 0:5c4d7b2438d3 724 mbedtls_mpi m_xm2_s, one;
switches 0:5c4d7b2438d3 725 unsigned char kx[MBEDTLS_ECP_MAX_BYTES];
switches 0:5c4d7b2438d3 726 size_t x_bytes;
switches 0:5c4d7b2438d3 727
switches 0:5c4d7b2438d3 728 *olen = mbedtls_md_get_size( ctx->md_info );
switches 0:5c4d7b2438d3 729 if( len < *olen )
switches 0:5c4d7b2438d3 730 return( MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL );
switches 0:5c4d7b2438d3 731
switches 0:5c4d7b2438d3 732 mbedtls_ecp_point_init( &K );
switches 0:5c4d7b2438d3 733 mbedtls_mpi_init( &m_xm2_s );
switches 0:5c4d7b2438d3 734 mbedtls_mpi_init( &one );
switches 0:5c4d7b2438d3 735
switches 0:5c4d7b2438d3 736 MBEDTLS_MPI_CHK( mbedtls_mpi_lset( &one, 1 ) );
switches 0:5c4d7b2438d3 737
switches 0:5c4d7b2438d3 738 /*
switches 0:5c4d7b2438d3 739 * Client: K = ( Xs - X4 * x2 * s ) * x2
switches 0:5c4d7b2438d3 740 * Server: K = ( Xc - X2 * x4 * s ) * x4
switches 0:5c4d7b2438d3 741 * Unified: K = ( Xp - Xp2 * xm2 * s ) * xm2
switches 0:5c4d7b2438d3 742 */
switches 0:5c4d7b2438d3 743 MBEDTLS_MPI_CHK( ecjpake_mul_secret( &m_xm2_s, -1, &ctx->xm2, &ctx->s,
switches 0:5c4d7b2438d3 744 &ctx->grp.N, f_rng, p_rng ) );
switches 0:5c4d7b2438d3 745 MBEDTLS_MPI_CHK( mbedtls_ecp_muladd( &ctx->grp, &K,
switches 0:5c4d7b2438d3 746 &one, &ctx->Xp,
switches 0:5c4d7b2438d3 747 &m_xm2_s, &ctx->Xp2 ) );
switches 0:5c4d7b2438d3 748 MBEDTLS_MPI_CHK( mbedtls_ecp_mul( &ctx->grp, &K, &ctx->xm2, &K,
switches 0:5c4d7b2438d3 749 f_rng, p_rng ) );
switches 0:5c4d7b2438d3 750
switches 0:5c4d7b2438d3 751 /* PMS = SHA-256( K.X ) */
switches 0:5c4d7b2438d3 752 x_bytes = ( ctx->grp.pbits + 7 ) / 8;
switches 0:5c4d7b2438d3 753 MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( &K.X, kx, x_bytes ) );
switches 0:5c4d7b2438d3 754 MBEDTLS_MPI_CHK( mbedtls_md( ctx->md_info, kx, x_bytes, buf ) );
switches 0:5c4d7b2438d3 755
switches 0:5c4d7b2438d3 756 cleanup:
switches 0:5c4d7b2438d3 757 mbedtls_ecp_point_free( &K );
switches 0:5c4d7b2438d3 758 mbedtls_mpi_free( &m_xm2_s );
switches 0:5c4d7b2438d3 759 mbedtls_mpi_free( &one );
switches 0:5c4d7b2438d3 760
switches 0:5c4d7b2438d3 761 return( ret );
switches 0:5c4d7b2438d3 762 }
switches 0:5c4d7b2438d3 763
switches 0:5c4d7b2438d3 764 #undef ID_MINE
switches 0:5c4d7b2438d3 765 #undef ID_PEER
switches 0:5c4d7b2438d3 766
switches 0:5c4d7b2438d3 767
switches 0:5c4d7b2438d3 768 #if defined(MBEDTLS_SELF_TEST)
switches 0:5c4d7b2438d3 769
switches 0:5c4d7b2438d3 770 #if defined(MBEDTLS_PLATFORM_C)
switches 0:5c4d7b2438d3 771 #include "mbedtls/platform.h"
switches 0:5c4d7b2438d3 772 #else
switches 0:5c4d7b2438d3 773 #include <stdio.h>
switches 0:5c4d7b2438d3 774 #define mbedtls_printf printf
switches 0:5c4d7b2438d3 775 #endif
switches 0:5c4d7b2438d3 776
switches 0:5c4d7b2438d3 777 #if !defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED) || \
switches 0:5c4d7b2438d3 778 !defined(MBEDTLS_SHA256_C)
switches 0:5c4d7b2438d3 779 int mbedtls_ecjpake_self_test( int verbose )
switches 0:5c4d7b2438d3 780 {
switches 0:5c4d7b2438d3 781 (void) verbose;
switches 0:5c4d7b2438d3 782 return( 0 );
switches 0:5c4d7b2438d3 783 }
switches 0:5c4d7b2438d3 784 #else
switches 0:5c4d7b2438d3 785
switches 0:5c4d7b2438d3 786 static const unsigned char ecjpake_test_password[] = {
switches 0:5c4d7b2438d3 787 0x74, 0x68, 0x72, 0x65, 0x61, 0x64, 0x6a, 0x70, 0x61, 0x6b, 0x65, 0x74,
switches 0:5c4d7b2438d3 788 0x65, 0x73, 0x74
switches 0:5c4d7b2438d3 789 };
switches 0:5c4d7b2438d3 790
switches 0:5c4d7b2438d3 791 static const unsigned char ecjpake_test_x1[] = {
switches 0:5c4d7b2438d3 792 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c,
switches 0:5c4d7b2438d3 793 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18,
switches 0:5c4d7b2438d3 794 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x21
switches 0:5c4d7b2438d3 795 };
switches 0:5c4d7b2438d3 796
switches 0:5c4d7b2438d3 797 static const unsigned char ecjpake_test_x2[] = {
switches 0:5c4d7b2438d3 798 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c,
switches 0:5c4d7b2438d3 799 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
switches 0:5c4d7b2438d3 800 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x81
switches 0:5c4d7b2438d3 801 };
switches 0:5c4d7b2438d3 802
switches 0:5c4d7b2438d3 803 static const unsigned char ecjpake_test_x3[] = {
switches 0:5c4d7b2438d3 804 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c,
switches 0:5c4d7b2438d3 805 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
switches 0:5c4d7b2438d3 806 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x81
switches 0:5c4d7b2438d3 807 };
switches 0:5c4d7b2438d3 808
switches 0:5c4d7b2438d3 809 static const unsigned char ecjpake_test_x4[] = {
switches 0:5c4d7b2438d3 810 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcc,
switches 0:5c4d7b2438d3 811 0xcd, 0xce, 0xcf, 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8,
switches 0:5c4d7b2438d3 812 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, 0xe1
switches 0:5c4d7b2438d3 813 };
switches 0:5c4d7b2438d3 814
switches 0:5c4d7b2438d3 815 static const unsigned char ecjpake_test_cli_one[] = {
switches 0:5c4d7b2438d3 816 0x41, 0x04, 0xac, 0xcf, 0x01, 0x06, 0xef, 0x85, 0x8f, 0xa2, 0xd9, 0x19,
switches 0:5c4d7b2438d3 817 0x33, 0x13, 0x46, 0x80, 0x5a, 0x78, 0xb5, 0x8b, 0xba, 0xd0, 0xb8, 0x44,
switches 0:5c4d7b2438d3 818 0xe5, 0xc7, 0x89, 0x28, 0x79, 0x14, 0x61, 0x87, 0xdd, 0x26, 0x66, 0xad,
switches 0:5c4d7b2438d3 819 0xa7, 0x81, 0xbb, 0x7f, 0x11, 0x13, 0x72, 0x25, 0x1a, 0x89, 0x10, 0x62,
switches 0:5c4d7b2438d3 820 0x1f, 0x63, 0x4d, 0xf1, 0x28, 0xac, 0x48, 0xe3, 0x81, 0xfd, 0x6e, 0xf9,
switches 0:5c4d7b2438d3 821 0x06, 0x07, 0x31, 0xf6, 0x94, 0xa4, 0x41, 0x04, 0x1d, 0xd0, 0xbd, 0x5d,
switches 0:5c4d7b2438d3 822 0x45, 0x66, 0xc9, 0xbe, 0xd9, 0xce, 0x7d, 0xe7, 0x01, 0xb5, 0xe8, 0x2e,
switches 0:5c4d7b2438d3 823 0x08, 0xe8, 0x4b, 0x73, 0x04, 0x66, 0x01, 0x8a, 0xb9, 0x03, 0xc7, 0x9e,
switches 0:5c4d7b2438d3 824 0xb9, 0x82, 0x17, 0x22, 0x36, 0xc0, 0xc1, 0x72, 0x8a, 0xe4, 0xbf, 0x73,
switches 0:5c4d7b2438d3 825 0x61, 0x0d, 0x34, 0xde, 0x44, 0x24, 0x6e, 0xf3, 0xd9, 0xc0, 0x5a, 0x22,
switches 0:5c4d7b2438d3 826 0x36, 0xfb, 0x66, 0xa6, 0x58, 0x3d, 0x74, 0x49, 0x30, 0x8b, 0xab, 0xce,
switches 0:5c4d7b2438d3 827 0x20, 0x72, 0xfe, 0x16, 0x66, 0x29, 0x92, 0xe9, 0x23, 0x5c, 0x25, 0x00,
switches 0:5c4d7b2438d3 828 0x2f, 0x11, 0xb1, 0x50, 0x87, 0xb8, 0x27, 0x38, 0xe0, 0x3c, 0x94, 0x5b,
switches 0:5c4d7b2438d3 829 0xf7, 0xa2, 0x99, 0x5d, 0xda, 0x1e, 0x98, 0x34, 0x58, 0x41, 0x04, 0x7e,
switches 0:5c4d7b2438d3 830 0xa6, 0xe3, 0xa4, 0x48, 0x70, 0x37, 0xa9, 0xe0, 0xdb, 0xd7, 0x92, 0x62,
switches 0:5c4d7b2438d3 831 0xb2, 0xcc, 0x27, 0x3e, 0x77, 0x99, 0x30, 0xfc, 0x18, 0x40, 0x9a, 0xc5,
switches 0:5c4d7b2438d3 832 0x36, 0x1c, 0x5f, 0xe6, 0x69, 0xd7, 0x02, 0xe1, 0x47, 0x79, 0x0a, 0xeb,
switches 0:5c4d7b2438d3 833 0x4c, 0xe7, 0xfd, 0x65, 0x75, 0xab, 0x0f, 0x6c, 0x7f, 0xd1, 0xc3, 0x35,
switches 0:5c4d7b2438d3 834 0x93, 0x9a, 0xa8, 0x63, 0xba, 0x37, 0xec, 0x91, 0xb7, 0xe3, 0x2b, 0xb0,
switches 0:5c4d7b2438d3 835 0x13, 0xbb, 0x2b, 0x41, 0x04, 0xa4, 0x95, 0x58, 0xd3, 0x2e, 0xd1, 0xeb,
switches 0:5c4d7b2438d3 836 0xfc, 0x18, 0x16, 0xaf, 0x4f, 0xf0, 0x9b, 0x55, 0xfc, 0xb4, 0xca, 0x47,
switches 0:5c4d7b2438d3 837 0xb2, 0xa0, 0x2d, 0x1e, 0x7c, 0xaf, 0x11, 0x79, 0xea, 0x3f, 0xe1, 0x39,
switches 0:5c4d7b2438d3 838 0x5b, 0x22, 0xb8, 0x61, 0x96, 0x40, 0x16, 0xfa, 0xba, 0xf7, 0x2c, 0x97,
switches 0:5c4d7b2438d3 839 0x56, 0x95, 0xd9, 0x3d, 0x4d, 0xf0, 0xe5, 0x19, 0x7f, 0xe9, 0xf0, 0x40,
switches 0:5c4d7b2438d3 840 0x63, 0x4e, 0xd5, 0x97, 0x64, 0x93, 0x77, 0x87, 0xbe, 0x20, 0xbc, 0x4d,
switches 0:5c4d7b2438d3 841 0xee, 0xbb, 0xf9, 0xb8, 0xd6, 0x0a, 0x33, 0x5f, 0x04, 0x6c, 0xa3, 0xaa,
switches 0:5c4d7b2438d3 842 0x94, 0x1e, 0x45, 0x86, 0x4c, 0x7c, 0xad, 0xef, 0x9c, 0xf7, 0x5b, 0x3d,
switches 0:5c4d7b2438d3 843 0x8b, 0x01, 0x0e, 0x44, 0x3e, 0xf0
switches 0:5c4d7b2438d3 844 };
switches 0:5c4d7b2438d3 845
switches 0:5c4d7b2438d3 846 static const unsigned char ecjpake_test_srv_one[] = {
switches 0:5c4d7b2438d3 847 0x41, 0x04, 0x7e, 0xa6, 0xe3, 0xa4, 0x48, 0x70, 0x37, 0xa9, 0xe0, 0xdb,
switches 0:5c4d7b2438d3 848 0xd7, 0x92, 0x62, 0xb2, 0xcc, 0x27, 0x3e, 0x77, 0x99, 0x30, 0xfc, 0x18,
switches 0:5c4d7b2438d3 849 0x40, 0x9a, 0xc5, 0x36, 0x1c, 0x5f, 0xe6, 0x69, 0xd7, 0x02, 0xe1, 0x47,
switches 0:5c4d7b2438d3 850 0x79, 0x0a, 0xeb, 0x4c, 0xe7, 0xfd, 0x65, 0x75, 0xab, 0x0f, 0x6c, 0x7f,
switches 0:5c4d7b2438d3 851 0xd1, 0xc3, 0x35, 0x93, 0x9a, 0xa8, 0x63, 0xba, 0x37, 0xec, 0x91, 0xb7,
switches 0:5c4d7b2438d3 852 0xe3, 0x2b, 0xb0, 0x13, 0xbb, 0x2b, 0x41, 0x04, 0x09, 0xf8, 0x5b, 0x3d,
switches 0:5c4d7b2438d3 853 0x20, 0xeb, 0xd7, 0x88, 0x5c, 0xe4, 0x64, 0xc0, 0x8d, 0x05, 0x6d, 0x64,
switches 0:5c4d7b2438d3 854 0x28, 0xfe, 0x4d, 0xd9, 0x28, 0x7a, 0xa3, 0x65, 0xf1, 0x31, 0xf4, 0x36,
switches 0:5c4d7b2438d3 855 0x0f, 0xf3, 0x86, 0xd8, 0x46, 0x89, 0x8b, 0xc4, 0xb4, 0x15, 0x83, 0xc2,
switches 0:5c4d7b2438d3 856 0xa5, 0x19, 0x7f, 0x65, 0xd7, 0x87, 0x42, 0x74, 0x6c, 0x12, 0xa5, 0xec,
switches 0:5c4d7b2438d3 857 0x0a, 0x4f, 0xfe, 0x2f, 0x27, 0x0a, 0x75, 0x0a, 0x1d, 0x8f, 0xb5, 0x16,
switches 0:5c4d7b2438d3 858 0x20, 0x93, 0x4d, 0x74, 0xeb, 0x43, 0xe5, 0x4d, 0xf4, 0x24, 0xfd, 0x96,
switches 0:5c4d7b2438d3 859 0x30, 0x6c, 0x01, 0x17, 0xbf, 0x13, 0x1a, 0xfa, 0xbf, 0x90, 0xa9, 0xd3,
switches 0:5c4d7b2438d3 860 0x3d, 0x11, 0x98, 0xd9, 0x05, 0x19, 0x37, 0x35, 0x14, 0x41, 0x04, 0x19,
switches 0:5c4d7b2438d3 861 0x0a, 0x07, 0x70, 0x0f, 0xfa, 0x4b, 0xe6, 0xae, 0x1d, 0x79, 0xee, 0x0f,
switches 0:5c4d7b2438d3 862 0x06, 0xae, 0xb5, 0x44, 0xcd, 0x5a, 0xdd, 0xaa, 0xbe, 0xdf, 0x70, 0xf8,
switches 0:5c4d7b2438d3 863 0x62, 0x33, 0x21, 0x33, 0x2c, 0x54, 0xf3, 0x55, 0xf0, 0xfb, 0xfe, 0xc7,
switches 0:5c4d7b2438d3 864 0x83, 0xed, 0x35, 0x9e, 0x5d, 0x0b, 0xf7, 0x37, 0x7a, 0x0f, 0xc4, 0xea,
switches 0:5c4d7b2438d3 865 0x7a, 0xce, 0x47, 0x3c, 0x9c, 0x11, 0x2b, 0x41, 0xcc, 0xd4, 0x1a, 0xc5,
switches 0:5c4d7b2438d3 866 0x6a, 0x56, 0x12, 0x41, 0x04, 0x36, 0x0a, 0x1c, 0xea, 0x33, 0xfc, 0xe6,
switches 0:5c4d7b2438d3 867 0x41, 0x15, 0x64, 0x58, 0xe0, 0xa4, 0xea, 0xc2, 0x19, 0xe9, 0x68, 0x31,
switches 0:5c4d7b2438d3 868 0xe6, 0xae, 0xbc, 0x88, 0xb3, 0xf3, 0x75, 0x2f, 0x93, 0xa0, 0x28, 0x1d,
switches 0:5c4d7b2438d3 869 0x1b, 0xf1, 0xfb, 0x10, 0x60, 0x51, 0xdb, 0x96, 0x94, 0xa8, 0xd6, 0xe8,
switches 0:5c4d7b2438d3 870 0x62, 0xa5, 0xef, 0x13, 0x24, 0xa3, 0xd9, 0xe2, 0x78, 0x94, 0xf1, 0xee,
switches 0:5c4d7b2438d3 871 0x4f, 0x7c, 0x59, 0x19, 0x99, 0x65, 0xa8, 0xdd, 0x4a, 0x20, 0x91, 0x84,
switches 0:5c4d7b2438d3 872 0x7d, 0x2d, 0x22, 0xdf, 0x3e, 0xe5, 0x5f, 0xaa, 0x2a, 0x3f, 0xb3, 0x3f,
switches 0:5c4d7b2438d3 873 0xd2, 0xd1, 0xe0, 0x55, 0xa0, 0x7a, 0x7c, 0x61, 0xec, 0xfb, 0x8d, 0x80,
switches 0:5c4d7b2438d3 874 0xec, 0x00, 0xc2, 0xc9, 0xeb, 0x12
switches 0:5c4d7b2438d3 875 };
switches 0:5c4d7b2438d3 876
switches 0:5c4d7b2438d3 877 static const unsigned char ecjpake_test_srv_two[] = {
switches 0:5c4d7b2438d3 878 0x03, 0x00, 0x17, 0x41, 0x04, 0x0f, 0xb2, 0x2b, 0x1d, 0x5d, 0x11, 0x23,
switches 0:5c4d7b2438d3 879 0xe0, 0xef, 0x9f, 0xeb, 0x9d, 0x8a, 0x2e, 0x59, 0x0a, 0x1f, 0x4d, 0x7c,
switches 0:5c4d7b2438d3 880 0xed, 0x2c, 0x2b, 0x06, 0x58, 0x6e, 0x8f, 0x2a, 0x16, 0xd4, 0xeb, 0x2f,
switches 0:5c4d7b2438d3 881 0xda, 0x43, 0x28, 0xa2, 0x0b, 0x07, 0xd8, 0xfd, 0x66, 0x76, 0x54, 0xca,
switches 0:5c4d7b2438d3 882 0x18, 0xc5, 0x4e, 0x32, 0xa3, 0x33, 0xa0, 0x84, 0x54, 0x51, 0xe9, 0x26,
switches 0:5c4d7b2438d3 883 0xee, 0x88, 0x04, 0xfd, 0x7a, 0xf0, 0xaa, 0xa7, 0xa6, 0x41, 0x04, 0x55,
switches 0:5c4d7b2438d3 884 0x16, 0xea, 0x3e, 0x54, 0xa0, 0xd5, 0xd8, 0xb2, 0xce, 0x78, 0x6b, 0x38,
switches 0:5c4d7b2438d3 885 0xd3, 0x83, 0x37, 0x00, 0x29, 0xa5, 0xdb, 0xe4, 0x45, 0x9c, 0x9d, 0xd6,
switches 0:5c4d7b2438d3 886 0x01, 0xb4, 0x08, 0xa2, 0x4a, 0xe6, 0x46, 0x5c, 0x8a, 0xc9, 0x05, 0xb9,
switches 0:5c4d7b2438d3 887 0xeb, 0x03, 0xb5, 0xd3, 0x69, 0x1c, 0x13, 0x9e, 0xf8, 0x3f, 0x1c, 0xd4,
switches 0:5c4d7b2438d3 888 0x20, 0x0f, 0x6c, 0x9c, 0xd4, 0xec, 0x39, 0x22, 0x18, 0xa5, 0x9e, 0xd2,
switches 0:5c4d7b2438d3 889 0x43, 0xd3, 0xc8, 0x20, 0xff, 0x72, 0x4a, 0x9a, 0x70, 0xb8, 0x8c, 0xb8,
switches 0:5c4d7b2438d3 890 0x6f, 0x20, 0xb4, 0x34, 0xc6, 0x86, 0x5a, 0xa1, 0xcd, 0x79, 0x06, 0xdd,
switches 0:5c4d7b2438d3 891 0x7c, 0x9b, 0xce, 0x35, 0x25, 0xf5, 0x08, 0x27, 0x6f, 0x26, 0x83, 0x6c
switches 0:5c4d7b2438d3 892 };
switches 0:5c4d7b2438d3 893
switches 0:5c4d7b2438d3 894 static const unsigned char ecjpake_test_cli_two[] = {
switches 0:5c4d7b2438d3 895 0x41, 0x04, 0x69, 0xd5, 0x4e, 0xe8, 0x5e, 0x90, 0xce, 0x3f, 0x12, 0x46,
switches 0:5c4d7b2438d3 896 0x74, 0x2d, 0xe5, 0x07, 0xe9, 0x39, 0xe8, 0x1d, 0x1d, 0xc1, 0xc5, 0xcb,
switches 0:5c4d7b2438d3 897 0x98, 0x8b, 0x58, 0xc3, 0x10, 0xc9, 0xfd, 0xd9, 0x52, 0x4d, 0x93, 0x72,
switches 0:5c4d7b2438d3 898 0x0b, 0x45, 0x54, 0x1c, 0x83, 0xee, 0x88, 0x41, 0x19, 0x1d, 0xa7, 0xce,
switches 0:5c4d7b2438d3 899 0xd8, 0x6e, 0x33, 0x12, 0xd4, 0x36, 0x23, 0xc1, 0xd6, 0x3e, 0x74, 0x98,
switches 0:5c4d7b2438d3 900 0x9a, 0xba, 0x4a, 0xff, 0xd1, 0xee, 0x41, 0x04, 0x07, 0x7e, 0x8c, 0x31,
switches 0:5c4d7b2438d3 901 0xe2, 0x0e, 0x6b, 0xed, 0xb7, 0x60, 0xc1, 0x35, 0x93, 0xe6, 0x9f, 0x15,
switches 0:5c4d7b2438d3 902 0xbe, 0x85, 0xc2, 0x7d, 0x68, 0xcd, 0x09, 0xcc, 0xb8, 0xc4, 0x18, 0x36,
switches 0:5c4d7b2438d3 903 0x08, 0x91, 0x7c, 0x5c, 0x3d, 0x40, 0x9f, 0xac, 0x39, 0xfe, 0xfe, 0xe8,
switches 0:5c4d7b2438d3 904 0x2f, 0x72, 0x92, 0xd3, 0x6f, 0x0d, 0x23, 0xe0, 0x55, 0x91, 0x3f, 0x45,
switches 0:5c4d7b2438d3 905 0xa5, 0x2b, 0x85, 0xdd, 0x8a, 0x20, 0x52, 0xe9, 0xe1, 0x29, 0xbb, 0x4d,
switches 0:5c4d7b2438d3 906 0x20, 0x0f, 0x01, 0x1f, 0x19, 0x48, 0x35, 0x35, 0xa6, 0xe8, 0x9a, 0x58,
switches 0:5c4d7b2438d3 907 0x0c, 0x9b, 0x00, 0x03, 0xba, 0xf2, 0x14, 0x62, 0xec, 0xe9, 0x1a, 0x82,
switches 0:5c4d7b2438d3 908 0xcc, 0x38, 0xdb, 0xdc, 0xae, 0x60, 0xd9, 0xc5, 0x4c
switches 0:5c4d7b2438d3 909 };
switches 0:5c4d7b2438d3 910
switches 0:5c4d7b2438d3 911 static const unsigned char ecjpake_test_pms[] = {
switches 0:5c4d7b2438d3 912 0xf3, 0xd4, 0x7f, 0x59, 0x98, 0x44, 0xdb, 0x92, 0xa5, 0x69, 0xbb, 0xe7,
switches 0:5c4d7b2438d3 913 0x98, 0x1e, 0x39, 0xd9, 0x31, 0xfd, 0x74, 0x3b, 0xf2, 0x2e, 0x98, 0xf9,
switches 0:5c4d7b2438d3 914 0xb4, 0x38, 0xf7, 0x19, 0xd3, 0xc4, 0xf3, 0x51
switches 0:5c4d7b2438d3 915 };
switches 0:5c4d7b2438d3 916
switches 0:5c4d7b2438d3 917 /* Load my private keys and generate the correponding public keys */
switches 0:5c4d7b2438d3 918 static int ecjpake_test_load( mbedtls_ecjpake_context *ctx,
switches 0:5c4d7b2438d3 919 const unsigned char *xm1, size_t len1,
switches 0:5c4d7b2438d3 920 const unsigned char *xm2, size_t len2 )
switches 0:5c4d7b2438d3 921 {
switches 0:5c4d7b2438d3 922 int ret;
switches 0:5c4d7b2438d3 923
switches 0:5c4d7b2438d3 924 MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &ctx->xm1, xm1, len1 ) );
switches 0:5c4d7b2438d3 925 MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &ctx->xm2, xm2, len2 ) );
switches 0:5c4d7b2438d3 926 MBEDTLS_MPI_CHK( mbedtls_ecp_mul( &ctx->grp, &ctx->Xm1, &ctx->xm1,
switches 0:5c4d7b2438d3 927 &ctx->grp.G, NULL, NULL ) );
switches 0:5c4d7b2438d3 928 MBEDTLS_MPI_CHK( mbedtls_ecp_mul( &ctx->grp, &ctx->Xm2, &ctx->xm2,
switches 0:5c4d7b2438d3 929 &ctx->grp.G, NULL, NULL ) );
switches 0:5c4d7b2438d3 930
switches 0:5c4d7b2438d3 931 cleanup:
switches 0:5c4d7b2438d3 932 return( ret );
switches 0:5c4d7b2438d3 933 }
switches 0:5c4d7b2438d3 934
switches 0:5c4d7b2438d3 935 /* For tests we don't need a secure RNG;
switches 0:5c4d7b2438d3 936 * use the LGC from Numerical Recipes for simplicity */
switches 0:5c4d7b2438d3 937 static int ecjpake_lgc( void *p, unsigned char *out, size_t len )
switches 0:5c4d7b2438d3 938 {
switches 0:5c4d7b2438d3 939 static uint32_t x = 42;
switches 0:5c4d7b2438d3 940 (void) p;
switches 0:5c4d7b2438d3 941
switches 0:5c4d7b2438d3 942 while( len > 0 )
switches 0:5c4d7b2438d3 943 {
switches 0:5c4d7b2438d3 944 size_t use_len = len > 4 ? 4 : len;
switches 0:5c4d7b2438d3 945 x = 1664525 * x + 1013904223;
switches 0:5c4d7b2438d3 946 memcpy( out, &x, use_len );
switches 0:5c4d7b2438d3 947 out += use_len;
switches 0:5c4d7b2438d3 948 len -= use_len;
switches 0:5c4d7b2438d3 949 }
switches 0:5c4d7b2438d3 950
switches 0:5c4d7b2438d3 951 return( 0 );
switches 0:5c4d7b2438d3 952 }
switches 0:5c4d7b2438d3 953
switches 0:5c4d7b2438d3 954 #define TEST_ASSERT( x ) \
switches 0:5c4d7b2438d3 955 do { \
switches 0:5c4d7b2438d3 956 if( x ) \
switches 0:5c4d7b2438d3 957 ret = 0; \
switches 0:5c4d7b2438d3 958 else \
switches 0:5c4d7b2438d3 959 { \
switches 0:5c4d7b2438d3 960 ret = 1; \
switches 0:5c4d7b2438d3 961 goto cleanup; \
switches 0:5c4d7b2438d3 962 } \
switches 0:5c4d7b2438d3 963 } while( 0 )
switches 0:5c4d7b2438d3 964
switches 0:5c4d7b2438d3 965 /*
switches 0:5c4d7b2438d3 966 * Checkup routine
switches 0:5c4d7b2438d3 967 */
switches 0:5c4d7b2438d3 968 int mbedtls_ecjpake_self_test( int verbose )
switches 0:5c4d7b2438d3 969 {
switches 0:5c4d7b2438d3 970 int ret;
switches 0:5c4d7b2438d3 971 mbedtls_ecjpake_context cli;
switches 0:5c4d7b2438d3 972 mbedtls_ecjpake_context srv;
switches 0:5c4d7b2438d3 973 unsigned char buf[512], pms[32];
switches 0:5c4d7b2438d3 974 size_t len, pmslen;
switches 0:5c4d7b2438d3 975
switches 0:5c4d7b2438d3 976 mbedtls_ecjpake_init( &cli );
switches 0:5c4d7b2438d3 977 mbedtls_ecjpake_init( &srv );
switches 0:5c4d7b2438d3 978
switches 0:5c4d7b2438d3 979 if( verbose != 0 )
switches 0:5c4d7b2438d3 980 mbedtls_printf( " ECJPAKE test #0 (setup): " );
switches 0:5c4d7b2438d3 981
switches 0:5c4d7b2438d3 982 TEST_ASSERT( mbedtls_ecjpake_setup( &cli, MBEDTLS_ECJPAKE_CLIENT,
switches 0:5c4d7b2438d3 983 MBEDTLS_MD_SHA256, MBEDTLS_ECP_DP_SECP256R1,
switches 0:5c4d7b2438d3 984 ecjpake_test_password,
switches 0:5c4d7b2438d3 985 sizeof( ecjpake_test_password ) ) == 0 );
switches 0:5c4d7b2438d3 986
switches 0:5c4d7b2438d3 987 TEST_ASSERT( mbedtls_ecjpake_setup( &srv, MBEDTLS_ECJPAKE_SERVER,
switches 0:5c4d7b2438d3 988 MBEDTLS_MD_SHA256, MBEDTLS_ECP_DP_SECP256R1,
switches 0:5c4d7b2438d3 989 ecjpake_test_password,
switches 0:5c4d7b2438d3 990 sizeof( ecjpake_test_password ) ) == 0 );
switches 0:5c4d7b2438d3 991
switches 0:5c4d7b2438d3 992 if( verbose != 0 )
switches 0:5c4d7b2438d3 993 mbedtls_printf( "passed\n" );
switches 0:5c4d7b2438d3 994
switches 0:5c4d7b2438d3 995 if( verbose != 0 )
switches 0:5c4d7b2438d3 996 mbedtls_printf( " ECJPAKE test #1 (random handshake): " );
switches 0:5c4d7b2438d3 997
switches 0:5c4d7b2438d3 998 TEST_ASSERT( mbedtls_ecjpake_write_round_one( &cli,
switches 0:5c4d7b2438d3 999 buf, sizeof( buf ), &len, ecjpake_lgc, NULL ) == 0 );
switches 0:5c4d7b2438d3 1000
switches 0:5c4d7b2438d3 1001 TEST_ASSERT( mbedtls_ecjpake_read_round_one( &srv, buf, len ) == 0 );
switches 0:5c4d7b2438d3 1002
switches 0:5c4d7b2438d3 1003 TEST_ASSERT( mbedtls_ecjpake_write_round_one( &srv,
switches 0:5c4d7b2438d3 1004 buf, sizeof( buf ), &len, ecjpake_lgc, NULL ) == 0 );
switches 0:5c4d7b2438d3 1005
switches 0:5c4d7b2438d3 1006 TEST_ASSERT( mbedtls_ecjpake_read_round_one( &cli, buf, len ) == 0 );
switches 0:5c4d7b2438d3 1007
switches 0:5c4d7b2438d3 1008 TEST_ASSERT( mbedtls_ecjpake_write_round_two( &srv,
switches 0:5c4d7b2438d3 1009 buf, sizeof( buf ), &len, ecjpake_lgc, NULL ) == 0 );
switches 0:5c4d7b2438d3 1010
switches 0:5c4d7b2438d3 1011 TEST_ASSERT( mbedtls_ecjpake_read_round_two( &cli, buf, len ) == 0 );
switches 0:5c4d7b2438d3 1012
switches 0:5c4d7b2438d3 1013 TEST_ASSERT( mbedtls_ecjpake_derive_secret( &cli,
switches 0:5c4d7b2438d3 1014 pms, sizeof( pms ), &pmslen, ecjpake_lgc, NULL ) == 0 );
switches 0:5c4d7b2438d3 1015
switches 0:5c4d7b2438d3 1016 TEST_ASSERT( mbedtls_ecjpake_write_round_two( &cli,
switches 0:5c4d7b2438d3 1017 buf, sizeof( buf ), &len, ecjpake_lgc, NULL ) == 0 );
switches 0:5c4d7b2438d3 1018
switches 0:5c4d7b2438d3 1019 TEST_ASSERT( mbedtls_ecjpake_read_round_two( &srv, buf, len ) == 0 );
switches 0:5c4d7b2438d3 1020
switches 0:5c4d7b2438d3 1021 TEST_ASSERT( mbedtls_ecjpake_derive_secret( &srv,
switches 0:5c4d7b2438d3 1022 buf, sizeof( buf ), &len, ecjpake_lgc, NULL ) == 0 );
switches 0:5c4d7b2438d3 1023
switches 0:5c4d7b2438d3 1024 TEST_ASSERT( len == pmslen );
switches 0:5c4d7b2438d3 1025 TEST_ASSERT( memcmp( buf, pms, len ) == 0 );
switches 0:5c4d7b2438d3 1026
switches 0:5c4d7b2438d3 1027 if( verbose != 0 )
switches 0:5c4d7b2438d3 1028 mbedtls_printf( "passed\n" );
switches 0:5c4d7b2438d3 1029
switches 0:5c4d7b2438d3 1030 if( verbose != 0 )
switches 0:5c4d7b2438d3 1031 mbedtls_printf( " ECJPAKE test #2 (reference handshake): " );
switches 0:5c4d7b2438d3 1032
switches 0:5c4d7b2438d3 1033 /* Simulate generation of round one */
switches 0:5c4d7b2438d3 1034 MBEDTLS_MPI_CHK( ecjpake_test_load( &cli,
switches 0:5c4d7b2438d3 1035 ecjpake_test_x1, sizeof( ecjpake_test_x1 ),
switches 0:5c4d7b2438d3 1036 ecjpake_test_x2, sizeof( ecjpake_test_x2 ) ) );
switches 0:5c4d7b2438d3 1037
switches 0:5c4d7b2438d3 1038 MBEDTLS_MPI_CHK( ecjpake_test_load( &srv,
switches 0:5c4d7b2438d3 1039 ecjpake_test_x3, sizeof( ecjpake_test_x3 ),
switches 0:5c4d7b2438d3 1040 ecjpake_test_x4, sizeof( ecjpake_test_x4 ) ) );
switches 0:5c4d7b2438d3 1041
switches 0:5c4d7b2438d3 1042 /* Read round one */
switches 0:5c4d7b2438d3 1043 TEST_ASSERT( mbedtls_ecjpake_read_round_one( &srv,
switches 0:5c4d7b2438d3 1044 ecjpake_test_cli_one,
switches 0:5c4d7b2438d3 1045 sizeof( ecjpake_test_cli_one ) ) == 0 );
switches 0:5c4d7b2438d3 1046
switches 0:5c4d7b2438d3 1047 TEST_ASSERT( mbedtls_ecjpake_read_round_one( &cli,
switches 0:5c4d7b2438d3 1048 ecjpake_test_srv_one,
switches 0:5c4d7b2438d3 1049 sizeof( ecjpake_test_srv_one ) ) == 0 );
switches 0:5c4d7b2438d3 1050
switches 0:5c4d7b2438d3 1051 /* Skip generation of round two, read round two */
switches 0:5c4d7b2438d3 1052 TEST_ASSERT( mbedtls_ecjpake_read_round_two( &cli,
switches 0:5c4d7b2438d3 1053 ecjpake_test_srv_two,
switches 0:5c4d7b2438d3 1054 sizeof( ecjpake_test_srv_two ) ) == 0 );
switches 0:5c4d7b2438d3 1055
switches 0:5c4d7b2438d3 1056 TEST_ASSERT( mbedtls_ecjpake_read_round_two( &srv,
switches 0:5c4d7b2438d3 1057 ecjpake_test_cli_two,
switches 0:5c4d7b2438d3 1058 sizeof( ecjpake_test_cli_two ) ) == 0 );
switches 0:5c4d7b2438d3 1059
switches 0:5c4d7b2438d3 1060 /* Server derives PMS */
switches 0:5c4d7b2438d3 1061 TEST_ASSERT( mbedtls_ecjpake_derive_secret( &srv,
switches 0:5c4d7b2438d3 1062 buf, sizeof( buf ), &len, ecjpake_lgc, NULL ) == 0 );
switches 0:5c4d7b2438d3 1063
switches 0:5c4d7b2438d3 1064 TEST_ASSERT( len == sizeof( ecjpake_test_pms ) );
switches 0:5c4d7b2438d3 1065 TEST_ASSERT( memcmp( buf, ecjpake_test_pms, len ) == 0 );
switches 0:5c4d7b2438d3 1066
switches 0:5c4d7b2438d3 1067 memset( buf, 0, len ); /* Avoid interferences with next step */
switches 0:5c4d7b2438d3 1068
switches 0:5c4d7b2438d3 1069 /* Client derives PMS */
switches 0:5c4d7b2438d3 1070 TEST_ASSERT( mbedtls_ecjpake_derive_secret( &cli,
switches 0:5c4d7b2438d3 1071 buf, sizeof( buf ), &len, ecjpake_lgc, NULL ) == 0 );
switches 0:5c4d7b2438d3 1072
switches 0:5c4d7b2438d3 1073 TEST_ASSERT( len == sizeof( ecjpake_test_pms ) );
switches 0:5c4d7b2438d3 1074 TEST_ASSERT( memcmp( buf, ecjpake_test_pms, len ) == 0 );
switches 0:5c4d7b2438d3 1075
switches 0:5c4d7b2438d3 1076 if( verbose != 0 )
switches 0:5c4d7b2438d3 1077 mbedtls_printf( "passed\n" );
switches 0:5c4d7b2438d3 1078
switches 0:5c4d7b2438d3 1079 cleanup:
switches 0:5c4d7b2438d3 1080 mbedtls_ecjpake_free( &cli );
switches 0:5c4d7b2438d3 1081 mbedtls_ecjpake_free( &srv );
switches 0:5c4d7b2438d3 1082
switches 0:5c4d7b2438d3 1083 if( ret != 0 )
switches 0:5c4d7b2438d3 1084 {
switches 0:5c4d7b2438d3 1085 if( verbose != 0 )
switches 0:5c4d7b2438d3 1086 mbedtls_printf( "failed\n" );
switches 0:5c4d7b2438d3 1087
switches 0:5c4d7b2438d3 1088 ret = 1;
switches 0:5c4d7b2438d3 1089 }
switches 0:5c4d7b2438d3 1090
switches 0:5c4d7b2438d3 1091 if( verbose != 0 )
switches 0:5c4d7b2438d3 1092 mbedtls_printf( "\n" );
switches 0:5c4d7b2438d3 1093
switches 0:5c4d7b2438d3 1094 return( ret );
switches 0:5c4d7b2438d3 1095 }
switches 0:5c4d7b2438d3 1096
switches 0:5c4d7b2438d3 1097 #undef TEST_ASSERT
switches 0:5c4d7b2438d3 1098
switches 0:5c4d7b2438d3 1099 #endif /* MBEDTLS_ECP_DP_SECP256R1_ENABLED && MBEDTLS_SHA256_C */
switches 0:5c4d7b2438d3 1100
switches 0:5c4d7b2438d3 1101 #endif /* MBEDTLS_SELF_TEST */
switches 0:5c4d7b2438d3 1102
switches 0:5c4d7b2438d3 1103 #endif /* MBEDTLS_ECJPAKE_C */