1 | /*
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2 | * Elliptic curve J-PAKE
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3 | *
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4 | * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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5 | * SPDX-License-Identifier: Apache-2.0
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6 | *
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7 | * Licensed under the Apache License, Version 2.0 (the "License"); you may
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8 | * not use this file except in compliance with the License.
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9 | * You may obtain a copy of the License at
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10 | *
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11 | * http://www.apache.org/licenses/LICENSE-2.0
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12 | *
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13 | * Unless required by applicable law or agreed to in writing, software
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14 | * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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15 | * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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16 | * See the License for the specific language governing permissions and
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17 | * limitations under the License.
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18 | *
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19 | * This file is part of mbed TLS (https://tls.mbed.org)
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20 | */
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21 |
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22 | /*
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23 | * References in the code are to the Thread v1.0 Specification,
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24 | * available to members of the Thread Group http://threadgroup.org/
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25 | */
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26 |
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27 | #if !defined(MBEDTLS_CONFIG_FILE)
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28 | #include "mbedtls/config.h"
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29 | #else
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30 | #include MBEDTLS_CONFIG_FILE
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31 | #endif
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32 |
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33 | #if defined(MBEDTLS_ECJPAKE_C)
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34 |
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35 | #include "mbedtls/ecjpake.h"
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36 | #include "mbedtls/platform_util.h"
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37 |
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38 | #include <string.h>
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39 |
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40 | #if !defined(MBEDTLS_ECJPAKE_ALT)
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41 |
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42 | /* Parameter validation macros based on platform_util.h */
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43 | #define ECJPAKE_VALIDATE_RET( cond ) \
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44 | MBEDTLS_INTERNAL_VALIDATE_RET( cond, MBEDTLS_ERR_ECP_BAD_INPUT_DATA )
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45 | #define ECJPAKE_VALIDATE( cond ) \
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46 | MBEDTLS_INTERNAL_VALIDATE( cond )
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47 |
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48 | /*
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49 | * Convert a mbedtls_ecjpake_role to identifier string
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50 | */
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51 | static const char * const ecjpake_id[] = {
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52 | "client",
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53 | "server"
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54 | };
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55 |
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56 | #define ID_MINE ( ecjpake_id[ ctx->role ] )
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57 | #define ID_PEER ( ecjpake_id[ 1 - ctx->role ] )
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58 |
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59 | /*
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60 | * Initialize context
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61 | */
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62 | void mbedtls_ecjpake_init( mbedtls_ecjpake_context *ctx )
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63 | {
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64 | ECJPAKE_VALIDATE( ctx != NULL );
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65 |
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66 | ctx->md_info = NULL;
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67 | mbedtls_ecp_group_init( &ctx->grp );
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68 | ctx->point_format = MBEDTLS_ECP_PF_UNCOMPRESSED;
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69 |
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70 | mbedtls_ecp_point_init( &ctx->Xm1 );
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71 | mbedtls_ecp_point_init( &ctx->Xm2 );
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72 | mbedtls_ecp_point_init( &ctx->Xp1 );
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73 | mbedtls_ecp_point_init( &ctx->Xp2 );
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74 | mbedtls_ecp_point_init( &ctx->Xp );
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75 |
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76 | mbedtls_mpi_init( &ctx->xm1 );
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77 | mbedtls_mpi_init( &ctx->xm2 );
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78 | mbedtls_mpi_init( &ctx->s );
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79 | }
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80 |
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81 | /*
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82 | * Free context
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83 | */
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84 | void mbedtls_ecjpake_free( mbedtls_ecjpake_context *ctx )
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85 | {
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86 | if( ctx == NULL )
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87 | return;
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88 |
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89 | ctx->md_info = NULL;
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90 | mbedtls_ecp_group_free( &ctx->grp );
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91 |
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92 | mbedtls_ecp_point_free( &ctx->Xm1 );
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93 | mbedtls_ecp_point_free( &ctx->Xm2 );
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94 | mbedtls_ecp_point_free( &ctx->Xp1 );
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95 | mbedtls_ecp_point_free( &ctx->Xp2 );
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96 | mbedtls_ecp_point_free( &ctx->Xp );
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97 |
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98 | mbedtls_mpi_free( &ctx->xm1 );
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99 | mbedtls_mpi_free( &ctx->xm2 );
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100 | mbedtls_mpi_free( &ctx->s );
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101 | }
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102 |
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103 | /*
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104 | * Setup context
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105 | */
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106 | int mbedtls_ecjpake_setup( mbedtls_ecjpake_context *ctx,
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107 | mbedtls_ecjpake_role role,
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108 | mbedtls_md_type_t hash,
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109 | mbedtls_ecp_group_id curve,
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110 | const unsigned char *secret,
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111 | size_t len )
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112 | {
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113 | int ret;
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114 |
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115 | ECJPAKE_VALIDATE_RET( ctx != NULL );
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116 | ECJPAKE_VALIDATE_RET( role == MBEDTLS_ECJPAKE_CLIENT ||
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117 | role == MBEDTLS_ECJPAKE_SERVER );
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118 | ECJPAKE_VALIDATE_RET( secret != NULL || len == 0 );
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119 |
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120 | ctx->role = role;
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121 |
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122 | if( ( ctx->md_info = mbedtls_md_info_from_type( hash ) ) == NULL )
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123 | return( MBEDTLS_ERR_MD_FEATURE_UNAVAILABLE );
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124 |
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125 | MBEDTLS_MPI_CHK( mbedtls_ecp_group_load( &ctx->grp, curve ) );
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126 |
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127 | MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &ctx->s, secret, len ) );
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128 |
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129 | cleanup:
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130 | if( ret != 0 )
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131 | mbedtls_ecjpake_free( ctx );
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132 |
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133 | return( ret );
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134 | }
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135 |
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136 | /*
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137 | * Check if context is ready for use
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138 | */
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139 | int mbedtls_ecjpake_check( const mbedtls_ecjpake_context *ctx )
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140 | {
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141 | ECJPAKE_VALIDATE_RET( ctx != NULL );
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142 |
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143 | if( ctx->md_info == NULL ||
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144 | ctx->grp.id == MBEDTLS_ECP_DP_NONE ||
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145 | ctx->s.p == NULL )
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146 | {
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147 | return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
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148 | }
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149 |
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150 | return( 0 );
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151 | }
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152 |
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153 | /*
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154 | * Write a point plus its length to a buffer
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155 | */
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156 | static int ecjpake_write_len_point( unsigned char **p,
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157 | const unsigned char *end,
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158 | const mbedtls_ecp_group *grp,
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159 | const int pf,
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160 | const mbedtls_ecp_point *P )
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161 | {
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162 | int ret;
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163 | size_t len;
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164 |
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165 | /* Need at least 4 for length plus 1 for point */
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166 | if( end < *p || end - *p < 5 )
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167 | return( MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL );
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168 |
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169 | ret = mbedtls_ecp_point_write_binary( grp, P, pf,
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170 | &len, *p + 4, end - ( *p + 4 ) );
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171 | if( ret != 0 )
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172 | return( ret );
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173 |
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174 | (*p)[0] = (unsigned char)( ( len >> 24 ) & 0xFF );
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175 | (*p)[1] = (unsigned char)( ( len >> 16 ) & 0xFF );
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176 | (*p)[2] = (unsigned char)( ( len >> 8 ) & 0xFF );
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177 | (*p)[3] = (unsigned char)( ( len ) & 0xFF );
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178 |
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179 | *p += 4 + len;
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180 |
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181 | return( 0 );
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182 | }
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183 |
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184 | /*
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185 | * Size of the temporary buffer for ecjpake_hash:
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186 | * 3 EC points plus their length, plus ID and its length (4 + 6 bytes)
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187 | */
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188 | #define ECJPAKE_HASH_BUF_LEN ( 3 * ( 4 + MBEDTLS_ECP_MAX_PT_LEN ) + 4 + 6 )
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189 |
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190 | /*
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191 | * Compute hash for ZKP (7.4.2.2.2.1)
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192 | */
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193 | static int ecjpake_hash( const mbedtls_md_info_t *md_info,
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194 | const mbedtls_ecp_group *grp,
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195 | const int pf,
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196 | const mbedtls_ecp_point *G,
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197 | const mbedtls_ecp_point *V,
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198 | const mbedtls_ecp_point *X,
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199 | const char *id,
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200 | mbedtls_mpi *h )
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201 | {
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202 | int ret;
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203 | unsigned char buf[ECJPAKE_HASH_BUF_LEN];
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204 | unsigned char *p = buf;
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205 | const unsigned char *end = buf + sizeof( buf );
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206 | const size_t id_len = strlen( id );
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207 | unsigned char hash[MBEDTLS_MD_MAX_SIZE];
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208 |
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209 | /* Write things to temporary buffer */
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210 | MBEDTLS_MPI_CHK( ecjpake_write_len_point( &p, end, grp, pf, G ) );
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211 | MBEDTLS_MPI_CHK( ecjpake_write_len_point( &p, end, grp, pf, V ) );
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212 | MBEDTLS_MPI_CHK( ecjpake_write_len_point( &p, end, grp, pf, X ) );
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213 |
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214 | if( end - p < 4 )
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215 | return( MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL );
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216 |
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217 | *p++ = (unsigned char)( ( id_len >> 24 ) & 0xFF );
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218 | *p++ = (unsigned char)( ( id_len >> 16 ) & 0xFF );
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219 | *p++ = (unsigned char)( ( id_len >> 8 ) & 0xFF );
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220 | *p++ = (unsigned char)( ( id_len ) & 0xFF );
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221 |
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222 | if( end < p || (size_t)( end - p ) < id_len )
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223 | return( MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL );
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224 |
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225 | memcpy( p, id, id_len );
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226 | p += id_len;
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227 |
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228 | /* Compute hash */
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229 | mbedtls_md( md_info, buf, p - buf, hash );
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230 |
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231 | /* Turn it into an integer mod n */
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232 | MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( h, hash,
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233 | mbedtls_md_get_size( md_info ) ) );
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234 | MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( h, h, &grp->N ) );
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235 |
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236 | cleanup:
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237 | return( ret );
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238 | }
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239 |
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240 | /*
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241 | * Parse a ECShnorrZKP (7.4.2.2.2) and verify it (7.4.2.3.3)
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242 | */
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243 | static int ecjpake_zkp_read( const mbedtls_md_info_t *md_info,
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244 | const mbedtls_ecp_group *grp,
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245 | const int pf,
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246 | const mbedtls_ecp_point *G,
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247 | const mbedtls_ecp_point *X,
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248 | const char *id,
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249 | const unsigned char **p,
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250 | const unsigned char *end )
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251 | {
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252 | int ret;
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253 | mbedtls_ecp_point V, VV;
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254 | mbedtls_mpi r, h;
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255 | size_t r_len;
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256 |
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257 | mbedtls_ecp_point_init( &V );
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258 | mbedtls_ecp_point_init( &VV );
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259 | mbedtls_mpi_init( &r );
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260 | mbedtls_mpi_init( &h );
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261 |
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262 | /*
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263 | * struct {
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264 | * ECPoint V;
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265 | * opaque r<1..2^8-1>;
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266 | * } ECSchnorrZKP;
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267 | */
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268 | if( end < *p )
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269 | return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
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270 |
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271 | MBEDTLS_MPI_CHK( mbedtls_ecp_tls_read_point( grp, &V, p, end - *p ) );
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272 |
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273 | if( end < *p || (size_t)( end - *p ) < 1 )
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274 | {
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275 | ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
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276 | goto cleanup;
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277 | }
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278 |
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279 | r_len = *(*p)++;
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280 |
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281 | if( end < *p || (size_t)( end - *p ) < r_len )
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282 | {
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283 | ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
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284 | goto cleanup;
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285 | }
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286 |
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287 | MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &r, *p, r_len ) );
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288 | *p += r_len;
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289 |
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290 | /*
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291 | * Verification
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292 | */
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293 | MBEDTLS_MPI_CHK( ecjpake_hash( md_info, grp, pf, G, &V, X, id, &h ) );
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294 | MBEDTLS_MPI_CHK( mbedtls_ecp_muladd( (mbedtls_ecp_group *) grp,
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295 | &VV, &h, X, &r, G ) );
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296 |
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297 | if( mbedtls_ecp_point_cmp( &VV, &V ) != 0 )
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298 | {
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299 | ret = MBEDTLS_ERR_ECP_VERIFY_FAILED;
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300 | goto cleanup;
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301 | }
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302 |
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303 | cleanup:
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304 | mbedtls_ecp_point_free( &V );
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305 | mbedtls_ecp_point_free( &VV );
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306 | mbedtls_mpi_free( &r );
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307 | mbedtls_mpi_free( &h );
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308 |
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309 | return( ret );
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310 | }
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311 |
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312 | /*
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313 | * Generate ZKP (7.4.2.3.2) and write it as ECSchnorrZKP (7.4.2.2.2)
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314 | */
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315 | static int ecjpake_zkp_write( const mbedtls_md_info_t *md_info,
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316 | const mbedtls_ecp_group *grp,
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317 | const int pf,
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318 | const mbedtls_ecp_point *G,
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319 | const mbedtls_mpi *x,
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320 | const mbedtls_ecp_point *X,
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321 | const char *id,
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322 | unsigned char **p,
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323 | const unsigned char *end,
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324 | int (*f_rng)(void *, unsigned char *, size_t),
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325 | void *p_rng )
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326 | {
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327 | int ret;
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328 | mbedtls_ecp_point V;
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329 | mbedtls_mpi v;
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330 | mbedtls_mpi h; /* later recycled to hold r */
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331 | size_t len;
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332 |
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333 | if( end < *p )
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334 | return( MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL );
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335 |
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336 | mbedtls_ecp_point_init( &V );
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337 | mbedtls_mpi_init( &v );
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338 | mbedtls_mpi_init( &h );
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339 |
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340 | /* Compute signature */
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341 | MBEDTLS_MPI_CHK( mbedtls_ecp_gen_keypair_base( (mbedtls_ecp_group *) grp,
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342 | G, &v, &V, f_rng, p_rng ) );
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343 | MBEDTLS_MPI_CHK( ecjpake_hash( md_info, grp, pf, G, &V, X, id, &h ) );
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344 | MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &h, &h, x ) ); /* x*h */
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345 | MBEDTLS_MPI_CHK( mbedtls_mpi_sub_mpi( &h, &v, &h ) ); /* v - x*h */
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346 | MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &h, &h, &grp->N ) ); /* r */
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347 |
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348 | /* Write it out */
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349 | MBEDTLS_MPI_CHK( mbedtls_ecp_tls_write_point( grp, &V,
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350 | pf, &len, *p, end - *p ) );
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351 | *p += len;
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352 |
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353 | len = mbedtls_mpi_size( &h ); /* actually r */
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354 | if( end < *p || (size_t)( end - *p ) < 1 + len || len > 255 )
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355 | {
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356 | ret = MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL;
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357 | goto cleanup;
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358 | }
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359 |
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360 | *(*p)++ = (unsigned char)( len & 0xFF );
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361 | MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( &h, *p, len ) ); /* r */
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362 | *p += len;
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363 |
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364 | cleanup:
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365 | mbedtls_ecp_point_free( &V );
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366 | mbedtls_mpi_free( &v );
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367 | mbedtls_mpi_free( &h );
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368 |
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369 | return( ret );
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370 | }
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371 |
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372 | /*
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373 | * Parse a ECJPAKEKeyKP (7.4.2.2.1) and check proof
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374 | * Output: verified public key X
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375 | */
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376 | static int ecjpake_kkp_read( const mbedtls_md_info_t *md_info,
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377 | const mbedtls_ecp_group *grp,
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378 | const int pf,
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379 | const mbedtls_ecp_point *G,
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380 | mbedtls_ecp_point *X,
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381 | const char *id,
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382 | const unsigned char **p,
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383 | const unsigned char *end )
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384 | {
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385 | int ret;
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386 |
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387 | if( end < *p )
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388 | return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
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389 |
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390 | /*
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391 | * struct {
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392 | * ECPoint X;
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393 | * ECSchnorrZKP zkp;
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394 | * } ECJPAKEKeyKP;
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395 | */
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396 | MBEDTLS_MPI_CHK( mbedtls_ecp_tls_read_point( grp, X, p, end - *p ) );
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397 | if( mbedtls_ecp_is_zero( X ) )
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398 | {
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399 | ret = MBEDTLS_ERR_ECP_INVALID_KEY;
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400 | goto cleanup;
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401 | }
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402 |
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403 | MBEDTLS_MPI_CHK( ecjpake_zkp_read( md_info, grp, pf, G, X, id, p, end ) );
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404 |
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405 | cleanup:
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406 | return( ret );
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407 | }
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408 |
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409 | /*
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410 | * Generate an ECJPAKEKeyKP
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411 | * Output: the serialized structure, plus private/public key pair
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412 | */
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413 | static int ecjpake_kkp_write( const mbedtls_md_info_t *md_info,
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414 | const mbedtls_ecp_group *grp,
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415 | const int pf,
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416 | const mbedtls_ecp_point *G,
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417 | mbedtls_mpi *x,
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418 | mbedtls_ecp_point *X,
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419 | const char *id,
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420 | unsigned char **p,
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421 | const unsigned char *end,
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422 | int (*f_rng)(void *, unsigned char *, size_t),
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423 | void *p_rng )
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424 | {
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425 | int ret;
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426 | size_t len;
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427 |
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428 | if( end < *p )
|
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429 | return( MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL );
|
---|
430 |
|
---|
431 | /* Generate key (7.4.2.3.1) and write it out */
|
---|
432 | MBEDTLS_MPI_CHK( mbedtls_ecp_gen_keypair_base( (mbedtls_ecp_group *) grp, G, x, X,
|
---|
433 | f_rng, p_rng ) );
|
---|
434 | MBEDTLS_MPI_CHK( mbedtls_ecp_tls_write_point( grp, X,
|
---|
435 | pf, &len, *p, end - *p ) );
|
---|
436 | *p += len;
|
---|
437 |
|
---|
438 | /* Generate and write proof */
|
---|
439 | MBEDTLS_MPI_CHK( ecjpake_zkp_write( md_info, grp, pf, G, x, X, id,
|
---|
440 | p, end, f_rng, p_rng ) );
|
---|
441 |
|
---|
442 | cleanup:
|
---|
443 | return( ret );
|
---|
444 | }
|
---|
445 |
|
---|
446 | /*
|
---|
447 | * Read a ECJPAKEKeyKPPairList (7.4.2.3) and check proofs
|
---|
448 | * Ouputs: verified peer public keys Xa, Xb
|
---|
449 | */
|
---|
450 | static int ecjpake_kkpp_read( const mbedtls_md_info_t *md_info,
|
---|
451 | const mbedtls_ecp_group *grp,
|
---|
452 | const int pf,
|
---|
453 | const mbedtls_ecp_point *G,
|
---|
454 | mbedtls_ecp_point *Xa,
|
---|
455 | mbedtls_ecp_point *Xb,
|
---|
456 | const char *id,
|
---|
457 | const unsigned char *buf,
|
---|
458 | size_t len )
|
---|
459 | {
|
---|
460 | int ret;
|
---|
461 | const unsigned char *p = buf;
|
---|
462 | const unsigned char *end = buf + len;
|
---|
463 |
|
---|
464 | /*
|
---|
465 | * struct {
|
---|
466 | * ECJPAKEKeyKP ecjpake_key_kp_pair_list[2];
|
---|
467 | * } ECJPAKEKeyKPPairList;
|
---|
468 | */
|
---|
469 | MBEDTLS_MPI_CHK( ecjpake_kkp_read( md_info, grp, pf, G, Xa, id, &p, end ) );
|
---|
470 | MBEDTLS_MPI_CHK( ecjpake_kkp_read( md_info, grp, pf, G, Xb, id, &p, end ) );
|
---|
471 |
|
---|
472 | if( p != end )
|
---|
473 | ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
|
---|
474 |
|
---|
475 | cleanup:
|
---|
476 | return( ret );
|
---|
477 | }
|
---|
478 |
|
---|
479 | /*
|
---|
480 | * Generate a ECJPAKEKeyKPPairList
|
---|
481 | * Outputs: the serialized structure, plus two private/public key pairs
|
---|
482 | */
|
---|
483 | static int ecjpake_kkpp_write( const mbedtls_md_info_t *md_info,
|
---|
484 | const mbedtls_ecp_group *grp,
|
---|
485 | const int pf,
|
---|
486 | const mbedtls_ecp_point *G,
|
---|
487 | mbedtls_mpi *xm1,
|
---|
488 | mbedtls_ecp_point *Xa,
|
---|
489 | mbedtls_mpi *xm2,
|
---|
490 | mbedtls_ecp_point *Xb,
|
---|
491 | const char *id,
|
---|
492 | unsigned char *buf,
|
---|
493 | size_t len,
|
---|
494 | size_t *olen,
|
---|
495 | int (*f_rng)(void *, unsigned char *, size_t),
|
---|
496 | void *p_rng )
|
---|
497 | {
|
---|
498 | int ret;
|
---|
499 | unsigned char *p = buf;
|
---|
500 | const unsigned char *end = buf + len;
|
---|
501 |
|
---|
502 | MBEDTLS_MPI_CHK( ecjpake_kkp_write( md_info, grp, pf, G, xm1, Xa, id,
|
---|
503 | &p, end, f_rng, p_rng ) );
|
---|
504 | MBEDTLS_MPI_CHK( ecjpake_kkp_write( md_info, grp, pf, G, xm2, Xb, id,
|
---|
505 | &p, end, f_rng, p_rng ) );
|
---|
506 |
|
---|
507 | *olen = p - buf;
|
---|
508 |
|
---|
509 | cleanup:
|
---|
510 | return( ret );
|
---|
511 | }
|
---|
512 |
|
---|
513 | /*
|
---|
514 | * Read and process the first round message
|
---|
515 | */
|
---|
516 | int mbedtls_ecjpake_read_round_one( mbedtls_ecjpake_context *ctx,
|
---|
517 | const unsigned char *buf,
|
---|
518 | size_t len )
|
---|
519 | {
|
---|
520 | ECJPAKE_VALIDATE_RET( ctx != NULL );
|
---|
521 | ECJPAKE_VALIDATE_RET( buf != NULL );
|
---|
522 |
|
---|
523 | return( ecjpake_kkpp_read( ctx->md_info, &ctx->grp, ctx->point_format,
|
---|
524 | &ctx->grp.G,
|
---|
525 | &ctx->Xp1, &ctx->Xp2, ID_PEER,
|
---|
526 | buf, len ) );
|
---|
527 | }
|
---|
528 |
|
---|
529 | /*
|
---|
530 | * Generate and write the first round message
|
---|
531 | */
|
---|
532 | int mbedtls_ecjpake_write_round_one( mbedtls_ecjpake_context *ctx,
|
---|
533 | unsigned char *buf, size_t len, size_t *olen,
|
---|
534 | int (*f_rng)(void *, unsigned char *, size_t),
|
---|
535 | void *p_rng )
|
---|
536 | {
|
---|
537 | ECJPAKE_VALIDATE_RET( ctx != NULL );
|
---|
538 | ECJPAKE_VALIDATE_RET( buf != NULL );
|
---|
539 | ECJPAKE_VALIDATE_RET( olen != NULL );
|
---|
540 | ECJPAKE_VALIDATE_RET( f_rng != NULL );
|
---|
541 |
|
---|
542 | return( ecjpake_kkpp_write( ctx->md_info, &ctx->grp, ctx->point_format,
|
---|
543 | &ctx->grp.G,
|
---|
544 | &ctx->xm1, &ctx->Xm1, &ctx->xm2, &ctx->Xm2,
|
---|
545 | ID_MINE, buf, len, olen, f_rng, p_rng ) );
|
---|
546 | }
|
---|
547 |
|
---|
548 | /*
|
---|
549 | * Compute the sum of three points R = A + B + C
|
---|
550 | */
|
---|
551 | static int ecjpake_ecp_add3( mbedtls_ecp_group *grp, mbedtls_ecp_point *R,
|
---|
552 | const mbedtls_ecp_point *A,
|
---|
553 | const mbedtls_ecp_point *B,
|
---|
554 | const mbedtls_ecp_point *C )
|
---|
555 | {
|
---|
556 | int ret;
|
---|
557 | mbedtls_mpi one;
|
---|
558 |
|
---|
559 | mbedtls_mpi_init( &one );
|
---|
560 |
|
---|
561 | MBEDTLS_MPI_CHK( mbedtls_mpi_lset( &one, 1 ) );
|
---|
562 | MBEDTLS_MPI_CHK( mbedtls_ecp_muladd( grp, R, &one, A, &one, B ) );
|
---|
563 | MBEDTLS_MPI_CHK( mbedtls_ecp_muladd( grp, R, &one, R, &one, C ) );
|
---|
564 |
|
---|
565 | cleanup:
|
---|
566 | mbedtls_mpi_free( &one );
|
---|
567 |
|
---|
568 | return( ret );
|
---|
569 | }
|
---|
570 |
|
---|
571 | /*
|
---|
572 | * Read and process second round message (C: 7.4.2.5, S: 7.4.2.6)
|
---|
573 | */
|
---|
574 | int mbedtls_ecjpake_read_round_two( mbedtls_ecjpake_context *ctx,
|
---|
575 | const unsigned char *buf,
|
---|
576 | size_t len )
|
---|
577 | {
|
---|
578 | int ret;
|
---|
579 | const unsigned char *p = buf;
|
---|
580 | const unsigned char *end = buf + len;
|
---|
581 | mbedtls_ecp_group grp;
|
---|
582 | mbedtls_ecp_point G; /* C: GB, S: GA */
|
---|
583 |
|
---|
584 | ECJPAKE_VALIDATE_RET( ctx != NULL );
|
---|
585 | ECJPAKE_VALIDATE_RET( buf != NULL );
|
---|
586 |
|
---|
587 | mbedtls_ecp_group_init( &grp );
|
---|
588 | mbedtls_ecp_point_init( &G );
|
---|
589 |
|
---|
590 | /*
|
---|
591 | * Server: GA = X3 + X4 + X1 (7.4.2.6.1)
|
---|
592 | * Client: GB = X1 + X2 + X3 (7.4.2.5.1)
|
---|
593 | * Unified: G = Xm1 + Xm2 + Xp1
|
---|
594 | * We need that before parsing in order to check Xp as we read it
|
---|
595 | */
|
---|
596 | MBEDTLS_MPI_CHK( ecjpake_ecp_add3( &ctx->grp, &G,
|
---|
597 | &ctx->Xm1, &ctx->Xm2, &ctx->Xp1 ) );
|
---|
598 |
|
---|
599 | /*
|
---|
600 | * struct {
|
---|
601 | * ECParameters curve_params; // only client reading server msg
|
---|
602 | * ECJPAKEKeyKP ecjpake_key_kp;
|
---|
603 | * } Client/ServerECJPAKEParams;
|
---|
604 | */
|
---|
605 | if( ctx->role == MBEDTLS_ECJPAKE_CLIENT )
|
---|
606 | {
|
---|
607 | MBEDTLS_MPI_CHK( mbedtls_ecp_tls_read_group( &grp, &p, len ) );
|
---|
608 | if( grp.id != ctx->grp.id )
|
---|
609 | {
|
---|
610 | ret = MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE;
|
---|
611 | goto cleanup;
|
---|
612 | }
|
---|
613 | }
|
---|
614 |
|
---|
615 | MBEDTLS_MPI_CHK( ecjpake_kkp_read( ctx->md_info, &ctx->grp,
|
---|
616 | ctx->point_format,
|
---|
617 | &G, &ctx->Xp, ID_PEER, &p, end ) );
|
---|
618 |
|
---|
619 | if( p != end )
|
---|
620 | {
|
---|
621 | ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
|
---|
622 | goto cleanup;
|
---|
623 | }
|
---|
624 |
|
---|
625 | cleanup:
|
---|
626 | mbedtls_ecp_group_free( &grp );
|
---|
627 | mbedtls_ecp_point_free( &G );
|
---|
628 |
|
---|
629 | return( ret );
|
---|
630 | }
|
---|
631 |
|
---|
632 | /*
|
---|
633 | * Compute R = +/- X * S mod N, taking care not to leak S
|
---|
634 | */
|
---|
635 | static int ecjpake_mul_secret( mbedtls_mpi *R, int sign,
|
---|
636 | const mbedtls_mpi *X,
|
---|
637 | const mbedtls_mpi *S,
|
---|
638 | const mbedtls_mpi *N,
|
---|
639 | int (*f_rng)(void *, unsigned char *, size_t),
|
---|
640 | void *p_rng )
|
---|
641 | {
|
---|
642 | int ret;
|
---|
643 | mbedtls_mpi b; /* Blinding value, then s + N * blinding */
|
---|
644 |
|
---|
645 | mbedtls_mpi_init( &b );
|
---|
646 |
|
---|
647 | /* b = s + rnd-128-bit * N */
|
---|
648 | MBEDTLS_MPI_CHK( mbedtls_mpi_fill_random( &b, 16, f_rng, p_rng ) );
|
---|
649 | MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &b, &b, N ) );
|
---|
650 | MBEDTLS_MPI_CHK( mbedtls_mpi_add_mpi( &b, &b, S ) );
|
---|
651 |
|
---|
652 | /* R = sign * X * b mod N */
|
---|
653 | MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( R, X, &b ) );
|
---|
654 | R->s *= sign;
|
---|
655 | MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( R, R, N ) );
|
---|
656 |
|
---|
657 | cleanup:
|
---|
658 | mbedtls_mpi_free( &b );
|
---|
659 |
|
---|
660 | return( ret );
|
---|
661 | }
|
---|
662 |
|
---|
663 | /*
|
---|
664 | * Generate and write the second round message (S: 7.4.2.5, C: 7.4.2.6)
|
---|
665 | */
|
---|
666 | int mbedtls_ecjpake_write_round_two( mbedtls_ecjpake_context *ctx,
|
---|
667 | unsigned char *buf, size_t len, size_t *olen,
|
---|
668 | int (*f_rng)(void *, unsigned char *, size_t),
|
---|
669 | void *p_rng )
|
---|
670 | {
|
---|
671 | int ret;
|
---|
672 | mbedtls_ecp_point G; /* C: GA, S: GB */
|
---|
673 | mbedtls_ecp_point Xm; /* C: Xc, S: Xs */
|
---|
674 | mbedtls_mpi xm; /* C: xc, S: xs */
|
---|
675 | unsigned char *p = buf;
|
---|
676 | const unsigned char *end = buf + len;
|
---|
677 | size_t ec_len;
|
---|
678 |
|
---|
679 | ECJPAKE_VALIDATE_RET( ctx != NULL );
|
---|
680 | ECJPAKE_VALIDATE_RET( buf != NULL );
|
---|
681 | ECJPAKE_VALIDATE_RET( olen != NULL );
|
---|
682 | ECJPAKE_VALIDATE_RET( f_rng != NULL );
|
---|
683 |
|
---|
684 | mbedtls_ecp_point_init( &G );
|
---|
685 | mbedtls_ecp_point_init( &Xm );
|
---|
686 | mbedtls_mpi_init( &xm );
|
---|
687 |
|
---|
688 | /*
|
---|
689 | * First generate private/public key pair (S: 7.4.2.5.1, C: 7.4.2.6.1)
|
---|
690 | *
|
---|
691 | * Client: GA = X1 + X3 + X4 | xs = x2 * s | Xc = xc * GA
|
---|
692 | * Server: GB = X3 + X1 + X2 | xs = x4 * s | Xs = xs * GB
|
---|
693 | * Unified: G = Xm1 + Xp1 + Xp2 | xm = xm2 * s | Xm = xm * G
|
---|
694 | */
|
---|
695 | MBEDTLS_MPI_CHK( ecjpake_ecp_add3( &ctx->grp, &G,
|
---|
696 | &ctx->Xp1, &ctx->Xp2, &ctx->Xm1 ) );
|
---|
697 | MBEDTLS_MPI_CHK( ecjpake_mul_secret( &xm, 1, &ctx->xm2, &ctx->s,
|
---|
698 | &ctx->grp.N, f_rng, p_rng ) );
|
---|
699 | MBEDTLS_MPI_CHK( mbedtls_ecp_mul( &ctx->grp, &Xm, &xm, &G, f_rng, p_rng ) );
|
---|
700 |
|
---|
701 | /*
|
---|
702 | * Now write things out
|
---|
703 | *
|
---|
704 | * struct {
|
---|
705 | * ECParameters curve_params; // only server writing its message
|
---|
706 | * ECJPAKEKeyKP ecjpake_key_kp;
|
---|
707 | * } Client/ServerECJPAKEParams;
|
---|
708 | */
|
---|
709 | if( ctx->role == MBEDTLS_ECJPAKE_SERVER )
|
---|
710 | {
|
---|
711 | if( end < p )
|
---|
712 | {
|
---|
713 | ret = MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL;
|
---|
714 | goto cleanup;
|
---|
715 | }
|
---|
716 | MBEDTLS_MPI_CHK( mbedtls_ecp_tls_write_group( &ctx->grp, &ec_len,
|
---|
717 | p, end - p ) );
|
---|
718 | p += ec_len;
|
---|
719 | }
|
---|
720 |
|
---|
721 | if( end < p )
|
---|
722 | {
|
---|
723 | ret = MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL;
|
---|
724 | goto cleanup;
|
---|
725 | }
|
---|
726 | MBEDTLS_MPI_CHK( mbedtls_ecp_tls_write_point( &ctx->grp, &Xm,
|
---|
727 | ctx->point_format, &ec_len, p, end - p ) );
|
---|
728 | p += ec_len;
|
---|
729 |
|
---|
730 | MBEDTLS_MPI_CHK( ecjpake_zkp_write( ctx->md_info, &ctx->grp,
|
---|
731 | ctx->point_format,
|
---|
732 | &G, &xm, &Xm, ID_MINE,
|
---|
733 | &p, end, f_rng, p_rng ) );
|
---|
734 |
|
---|
735 | *olen = p - buf;
|
---|
736 |
|
---|
737 | cleanup:
|
---|
738 | mbedtls_ecp_point_free( &G );
|
---|
739 | mbedtls_ecp_point_free( &Xm );
|
---|
740 | mbedtls_mpi_free( &xm );
|
---|
741 |
|
---|
742 | return( ret );
|
---|
743 | }
|
---|
744 |
|
---|
745 | /*
|
---|
746 | * Derive PMS (7.4.2.7 / 7.4.2.8)
|
---|
747 | */
|
---|
748 | int mbedtls_ecjpake_derive_secret( mbedtls_ecjpake_context *ctx,
|
---|
749 | unsigned char *buf, size_t len, size_t *olen,
|
---|
750 | int (*f_rng)(void *, unsigned char *, size_t),
|
---|
751 | void *p_rng )
|
---|
752 | {
|
---|
753 | int ret;
|
---|
754 | mbedtls_ecp_point K;
|
---|
755 | mbedtls_mpi m_xm2_s, one;
|
---|
756 | unsigned char kx[MBEDTLS_ECP_MAX_BYTES];
|
---|
757 | size_t x_bytes;
|
---|
758 |
|
---|
759 | ECJPAKE_VALIDATE_RET( ctx != NULL );
|
---|
760 | ECJPAKE_VALIDATE_RET( buf != NULL );
|
---|
761 | ECJPAKE_VALIDATE_RET( olen != NULL );
|
---|
762 | ECJPAKE_VALIDATE_RET( f_rng != NULL );
|
---|
763 |
|
---|
764 | *olen = mbedtls_md_get_size( ctx->md_info );
|
---|
765 | if( len < *olen )
|
---|
766 | return( MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL );
|
---|
767 |
|
---|
768 | mbedtls_ecp_point_init( &K );
|
---|
769 | mbedtls_mpi_init( &m_xm2_s );
|
---|
770 | mbedtls_mpi_init( &one );
|
---|
771 |
|
---|
772 | MBEDTLS_MPI_CHK( mbedtls_mpi_lset( &one, 1 ) );
|
---|
773 |
|
---|
774 | /*
|
---|
775 | * Client: K = ( Xs - X4 * x2 * s ) * x2
|
---|
776 | * Server: K = ( Xc - X2 * x4 * s ) * x4
|
---|
777 | * Unified: K = ( Xp - Xp2 * xm2 * s ) * xm2
|
---|
778 | */
|
---|
779 | MBEDTLS_MPI_CHK( ecjpake_mul_secret( &m_xm2_s, -1, &ctx->xm2, &ctx->s,
|
---|
780 | &ctx->grp.N, f_rng, p_rng ) );
|
---|
781 | MBEDTLS_MPI_CHK( mbedtls_ecp_muladd( &ctx->grp, &K,
|
---|
782 | &one, &ctx->Xp,
|
---|
783 | &m_xm2_s, &ctx->Xp2 ) );
|
---|
784 | MBEDTLS_MPI_CHK( mbedtls_ecp_mul( &ctx->grp, &K, &ctx->xm2, &K,
|
---|
785 | f_rng, p_rng ) );
|
---|
786 |
|
---|
787 | /* PMS = SHA-256( K.X ) */
|
---|
788 | x_bytes = ( ctx->grp.pbits + 7 ) / 8;
|
---|
789 | MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( &K.X, kx, x_bytes ) );
|
---|
790 | MBEDTLS_MPI_CHK( mbedtls_md( ctx->md_info, kx, x_bytes, buf ) );
|
---|
791 |
|
---|
792 | cleanup:
|
---|
793 | mbedtls_ecp_point_free( &K );
|
---|
794 | mbedtls_mpi_free( &m_xm2_s );
|
---|
795 | mbedtls_mpi_free( &one );
|
---|
796 |
|
---|
797 | return( ret );
|
---|
798 | }
|
---|
799 |
|
---|
800 | #undef ID_MINE
|
---|
801 | #undef ID_PEER
|
---|
802 |
|
---|
803 | #endif /* ! MBEDTLS_ECJPAKE_ALT */
|
---|
804 |
|
---|
805 | #if defined(MBEDTLS_SELF_TEST)
|
---|
806 |
|
---|
807 | #if defined(MBEDTLS_PLATFORM_C)
|
---|
808 | #include "mbedtls/platform.h"
|
---|
809 | #else
|
---|
810 | #include <stdio.h>
|
---|
811 | #define mbedtls_printf printf
|
---|
812 | #endif
|
---|
813 |
|
---|
814 | #if !defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED) || \
|
---|
815 | !defined(MBEDTLS_SHA256_C)
|
---|
816 | int mbedtls_ecjpake_self_test( int verbose )
|
---|
817 | {
|
---|
818 | (void) verbose;
|
---|
819 | return( 0 );
|
---|
820 | }
|
---|
821 | #else
|
---|
822 |
|
---|
823 | static const unsigned char ecjpake_test_password[] = {
|
---|
824 | 0x74, 0x68, 0x72, 0x65, 0x61, 0x64, 0x6a, 0x70, 0x61, 0x6b, 0x65, 0x74,
|
---|
825 | 0x65, 0x73, 0x74
|
---|
826 | };
|
---|
827 |
|
---|
828 | static const unsigned char ecjpake_test_x1[] = {
|
---|
829 | 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c,
|
---|
830 | 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18,
|
---|
831 | 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x21
|
---|
832 | };
|
---|
833 |
|
---|
834 | static const unsigned char ecjpake_test_x2[] = {
|
---|
835 | 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c,
|
---|
836 | 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
|
---|
837 | 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x81
|
---|
838 | };
|
---|
839 |
|
---|
840 | static const unsigned char ecjpake_test_x3[] = {
|
---|
841 | 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c,
|
---|
842 | 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
|
---|
843 | 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x81
|
---|
844 | };
|
---|
845 |
|
---|
846 | static const unsigned char ecjpake_test_x4[] = {
|
---|
847 | 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcc,
|
---|
848 | 0xcd, 0xce, 0xcf, 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8,
|
---|
849 | 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, 0xe1
|
---|
850 | };
|
---|
851 |
|
---|
852 | static const unsigned char ecjpake_test_cli_one[] = {
|
---|
853 | 0x41, 0x04, 0xac, 0xcf, 0x01, 0x06, 0xef, 0x85, 0x8f, 0xa2, 0xd9, 0x19,
|
---|
854 | 0x33, 0x13, 0x46, 0x80, 0x5a, 0x78, 0xb5, 0x8b, 0xba, 0xd0, 0xb8, 0x44,
|
---|
855 | 0xe5, 0xc7, 0x89, 0x28, 0x79, 0x14, 0x61, 0x87, 0xdd, 0x26, 0x66, 0xad,
|
---|
856 | 0xa7, 0x81, 0xbb, 0x7f, 0x11, 0x13, 0x72, 0x25, 0x1a, 0x89, 0x10, 0x62,
|
---|
857 | 0x1f, 0x63, 0x4d, 0xf1, 0x28, 0xac, 0x48, 0xe3, 0x81, 0xfd, 0x6e, 0xf9,
|
---|
858 | 0x06, 0x07, 0x31, 0xf6, 0x94, 0xa4, 0x41, 0x04, 0x1d, 0xd0, 0xbd, 0x5d,
|
---|
859 | 0x45, 0x66, 0xc9, 0xbe, 0xd9, 0xce, 0x7d, 0xe7, 0x01, 0xb5, 0xe8, 0x2e,
|
---|
860 | 0x08, 0xe8, 0x4b, 0x73, 0x04, 0x66, 0x01, 0x8a, 0xb9, 0x03, 0xc7, 0x9e,
|
---|
861 | 0xb9, 0x82, 0x17, 0x22, 0x36, 0xc0, 0xc1, 0x72, 0x8a, 0xe4, 0xbf, 0x73,
|
---|
862 | 0x61, 0x0d, 0x34, 0xde, 0x44, 0x24, 0x6e, 0xf3, 0xd9, 0xc0, 0x5a, 0x22,
|
---|
863 | 0x36, 0xfb, 0x66, 0xa6, 0x58, 0x3d, 0x74, 0x49, 0x30, 0x8b, 0xab, 0xce,
|
---|
864 | 0x20, 0x72, 0xfe, 0x16, 0x66, 0x29, 0x92, 0xe9, 0x23, 0x5c, 0x25, 0x00,
|
---|
865 | 0x2f, 0x11, 0xb1, 0x50, 0x87, 0xb8, 0x27, 0x38, 0xe0, 0x3c, 0x94, 0x5b,
|
---|
866 | 0xf7, 0xa2, 0x99, 0x5d, 0xda, 0x1e, 0x98, 0x34, 0x58, 0x41, 0x04, 0x7e,
|
---|
867 | 0xa6, 0xe3, 0xa4, 0x48, 0x70, 0x37, 0xa9, 0xe0, 0xdb, 0xd7, 0x92, 0x62,
|
---|
868 | 0xb2, 0xcc, 0x27, 0x3e, 0x77, 0x99, 0x30, 0xfc, 0x18, 0x40, 0x9a, 0xc5,
|
---|
869 | 0x36, 0x1c, 0x5f, 0xe6, 0x69, 0xd7, 0x02, 0xe1, 0x47, 0x79, 0x0a, 0xeb,
|
---|
870 | 0x4c, 0xe7, 0xfd, 0x65, 0x75, 0xab, 0x0f, 0x6c, 0x7f, 0xd1, 0xc3, 0x35,
|
---|
871 | 0x93, 0x9a, 0xa8, 0x63, 0xba, 0x37, 0xec, 0x91, 0xb7, 0xe3, 0x2b, 0xb0,
|
---|
872 | 0x13, 0xbb, 0x2b, 0x41, 0x04, 0xa4, 0x95, 0x58, 0xd3, 0x2e, 0xd1, 0xeb,
|
---|
873 | 0xfc, 0x18, 0x16, 0xaf, 0x4f, 0xf0, 0x9b, 0x55, 0xfc, 0xb4, 0xca, 0x47,
|
---|
874 | 0xb2, 0xa0, 0x2d, 0x1e, 0x7c, 0xaf, 0x11, 0x79, 0xea, 0x3f, 0xe1, 0x39,
|
---|
875 | 0x5b, 0x22, 0xb8, 0x61, 0x96, 0x40, 0x16, 0xfa, 0xba, 0xf7, 0x2c, 0x97,
|
---|
876 | 0x56, 0x95, 0xd9, 0x3d, 0x4d, 0xf0, 0xe5, 0x19, 0x7f, 0xe9, 0xf0, 0x40,
|
---|
877 | 0x63, 0x4e, 0xd5, 0x97, 0x64, 0x93, 0x77, 0x87, 0xbe, 0x20, 0xbc, 0x4d,
|
---|
878 | 0xee, 0xbb, 0xf9, 0xb8, 0xd6, 0x0a, 0x33, 0x5f, 0x04, 0x6c, 0xa3, 0xaa,
|
---|
879 | 0x94, 0x1e, 0x45, 0x86, 0x4c, 0x7c, 0xad, 0xef, 0x9c, 0xf7, 0x5b, 0x3d,
|
---|
880 | 0x8b, 0x01, 0x0e, 0x44, 0x3e, 0xf0
|
---|
881 | };
|
---|
882 |
|
---|
883 | static const unsigned char ecjpake_test_srv_one[] = {
|
---|
884 | 0x41, 0x04, 0x7e, 0xa6, 0xe3, 0xa4, 0x48, 0x70, 0x37, 0xa9, 0xe0, 0xdb,
|
---|
885 | 0xd7, 0x92, 0x62, 0xb2, 0xcc, 0x27, 0x3e, 0x77, 0x99, 0x30, 0xfc, 0x18,
|
---|
886 | 0x40, 0x9a, 0xc5, 0x36, 0x1c, 0x5f, 0xe6, 0x69, 0xd7, 0x02, 0xe1, 0x47,
|
---|
887 | 0x79, 0x0a, 0xeb, 0x4c, 0xe7, 0xfd, 0x65, 0x75, 0xab, 0x0f, 0x6c, 0x7f,
|
---|
888 | 0xd1, 0xc3, 0x35, 0x93, 0x9a, 0xa8, 0x63, 0xba, 0x37, 0xec, 0x91, 0xb7,
|
---|
889 | 0xe3, 0x2b, 0xb0, 0x13, 0xbb, 0x2b, 0x41, 0x04, 0x09, 0xf8, 0x5b, 0x3d,
|
---|
890 | 0x20, 0xeb, 0xd7, 0x88, 0x5c, 0xe4, 0x64, 0xc0, 0x8d, 0x05, 0x6d, 0x64,
|
---|
891 | 0x28, 0xfe, 0x4d, 0xd9, 0x28, 0x7a, 0xa3, 0x65, 0xf1, 0x31, 0xf4, 0x36,
|
---|
892 | 0x0f, 0xf3, 0x86, 0xd8, 0x46, 0x89, 0x8b, 0xc4, 0xb4, 0x15, 0x83, 0xc2,
|
---|
893 | 0xa5, 0x19, 0x7f, 0x65, 0xd7, 0x87, 0x42, 0x74, 0x6c, 0x12, 0xa5, 0xec,
|
---|
894 | 0x0a, 0x4f, 0xfe, 0x2f, 0x27, 0x0a, 0x75, 0x0a, 0x1d, 0x8f, 0xb5, 0x16,
|
---|
895 | 0x20, 0x93, 0x4d, 0x74, 0xeb, 0x43, 0xe5, 0x4d, 0xf4, 0x24, 0xfd, 0x96,
|
---|
896 | 0x30, 0x6c, 0x01, 0x17, 0xbf, 0x13, 0x1a, 0xfa, 0xbf, 0x90, 0xa9, 0xd3,
|
---|
897 | 0x3d, 0x11, 0x98, 0xd9, 0x05, 0x19, 0x37, 0x35, 0x14, 0x41, 0x04, 0x19,
|
---|
898 | 0x0a, 0x07, 0x70, 0x0f, 0xfa, 0x4b, 0xe6, 0xae, 0x1d, 0x79, 0xee, 0x0f,
|
---|
899 | 0x06, 0xae, 0xb5, 0x44, 0xcd, 0x5a, 0xdd, 0xaa, 0xbe, 0xdf, 0x70, 0xf8,
|
---|
900 | 0x62, 0x33, 0x21, 0x33, 0x2c, 0x54, 0xf3, 0x55, 0xf0, 0xfb, 0xfe, 0xc7,
|
---|
901 | 0x83, 0xed, 0x35, 0x9e, 0x5d, 0x0b, 0xf7, 0x37, 0x7a, 0x0f, 0xc4, 0xea,
|
---|
902 | 0x7a, 0xce, 0x47, 0x3c, 0x9c, 0x11, 0x2b, 0x41, 0xcc, 0xd4, 0x1a, 0xc5,
|
---|
903 | 0x6a, 0x56, 0x12, 0x41, 0x04, 0x36, 0x0a, 0x1c, 0xea, 0x33, 0xfc, 0xe6,
|
---|
904 | 0x41, 0x15, 0x64, 0x58, 0xe0, 0xa4, 0xea, 0xc2, 0x19, 0xe9, 0x68, 0x31,
|
---|
905 | 0xe6, 0xae, 0xbc, 0x88, 0xb3, 0xf3, 0x75, 0x2f, 0x93, 0xa0, 0x28, 0x1d,
|
---|
906 | 0x1b, 0xf1, 0xfb, 0x10, 0x60, 0x51, 0xdb, 0x96, 0x94, 0xa8, 0xd6, 0xe8,
|
---|
907 | 0x62, 0xa5, 0xef, 0x13, 0x24, 0xa3, 0xd9, 0xe2, 0x78, 0x94, 0xf1, 0xee,
|
---|
908 | 0x4f, 0x7c, 0x59, 0x19, 0x99, 0x65, 0xa8, 0xdd, 0x4a, 0x20, 0x91, 0x84,
|
---|
909 | 0x7d, 0x2d, 0x22, 0xdf, 0x3e, 0xe5, 0x5f, 0xaa, 0x2a, 0x3f, 0xb3, 0x3f,
|
---|
910 | 0xd2, 0xd1, 0xe0, 0x55, 0xa0, 0x7a, 0x7c, 0x61, 0xec, 0xfb, 0x8d, 0x80,
|
---|
911 | 0xec, 0x00, 0xc2, 0xc9, 0xeb, 0x12
|
---|
912 | };
|
---|
913 |
|
---|
914 | static const unsigned char ecjpake_test_srv_two[] = {
|
---|
915 | 0x03, 0x00, 0x17, 0x41, 0x04, 0x0f, 0xb2, 0x2b, 0x1d, 0x5d, 0x11, 0x23,
|
---|
916 | 0xe0, 0xef, 0x9f, 0xeb, 0x9d, 0x8a, 0x2e, 0x59, 0x0a, 0x1f, 0x4d, 0x7c,
|
---|
917 | 0xed, 0x2c, 0x2b, 0x06, 0x58, 0x6e, 0x8f, 0x2a, 0x16, 0xd4, 0xeb, 0x2f,
|
---|
918 | 0xda, 0x43, 0x28, 0xa2, 0x0b, 0x07, 0xd8, 0xfd, 0x66, 0x76, 0x54, 0xca,
|
---|
919 | 0x18, 0xc5, 0x4e, 0x32, 0xa3, 0x33, 0xa0, 0x84, 0x54, 0x51, 0xe9, 0x26,
|
---|
920 | 0xee, 0x88, 0x04, 0xfd, 0x7a, 0xf0, 0xaa, 0xa7, 0xa6, 0x41, 0x04, 0x55,
|
---|
921 | 0x16, 0xea, 0x3e, 0x54, 0xa0, 0xd5, 0xd8, 0xb2, 0xce, 0x78, 0x6b, 0x38,
|
---|
922 | 0xd3, 0x83, 0x37, 0x00, 0x29, 0xa5, 0xdb, 0xe4, 0x45, 0x9c, 0x9d, 0xd6,
|
---|
923 | 0x01, 0xb4, 0x08, 0xa2, 0x4a, 0xe6, 0x46, 0x5c, 0x8a, 0xc9, 0x05, 0xb9,
|
---|
924 | 0xeb, 0x03, 0xb5, 0xd3, 0x69, 0x1c, 0x13, 0x9e, 0xf8, 0x3f, 0x1c, 0xd4,
|
---|
925 | 0x20, 0x0f, 0x6c, 0x9c, 0xd4, 0xec, 0x39, 0x22, 0x18, 0xa5, 0x9e, 0xd2,
|
---|
926 | 0x43, 0xd3, 0xc8, 0x20, 0xff, 0x72, 0x4a, 0x9a, 0x70, 0xb8, 0x8c, 0xb8,
|
---|
927 | 0x6f, 0x20, 0xb4, 0x34, 0xc6, 0x86, 0x5a, 0xa1, 0xcd, 0x79, 0x06, 0xdd,
|
---|
928 | 0x7c, 0x9b, 0xce, 0x35, 0x25, 0xf5, 0x08, 0x27, 0x6f, 0x26, 0x83, 0x6c
|
---|
929 | };
|
---|
930 |
|
---|
931 | static const unsigned char ecjpake_test_cli_two[] = {
|
---|
932 | 0x41, 0x04, 0x69, 0xd5, 0x4e, 0xe8, 0x5e, 0x90, 0xce, 0x3f, 0x12, 0x46,
|
---|
933 | 0x74, 0x2d, 0xe5, 0x07, 0xe9, 0x39, 0xe8, 0x1d, 0x1d, 0xc1, 0xc5, 0xcb,
|
---|
934 | 0x98, 0x8b, 0x58, 0xc3, 0x10, 0xc9, 0xfd, 0xd9, 0x52, 0x4d, 0x93, 0x72,
|
---|
935 | 0x0b, 0x45, 0x54, 0x1c, 0x83, 0xee, 0x88, 0x41, 0x19, 0x1d, 0xa7, 0xce,
|
---|
936 | 0xd8, 0x6e, 0x33, 0x12, 0xd4, 0x36, 0x23, 0xc1, 0xd6, 0x3e, 0x74, 0x98,
|
---|
937 | 0x9a, 0xba, 0x4a, 0xff, 0xd1, 0xee, 0x41, 0x04, 0x07, 0x7e, 0x8c, 0x31,
|
---|
938 | 0xe2, 0x0e, 0x6b, 0xed, 0xb7, 0x60, 0xc1, 0x35, 0x93, 0xe6, 0x9f, 0x15,
|
---|
939 | 0xbe, 0x85, 0xc2, 0x7d, 0x68, 0xcd, 0x09, 0xcc, 0xb8, 0xc4, 0x18, 0x36,
|
---|
940 | 0x08, 0x91, 0x7c, 0x5c, 0x3d, 0x40, 0x9f, 0xac, 0x39, 0xfe, 0xfe, 0xe8,
|
---|
941 | 0x2f, 0x72, 0x92, 0xd3, 0x6f, 0x0d, 0x23, 0xe0, 0x55, 0x91, 0x3f, 0x45,
|
---|
942 | 0xa5, 0x2b, 0x85, 0xdd, 0x8a, 0x20, 0x52, 0xe9, 0xe1, 0x29, 0xbb, 0x4d,
|
---|
943 | 0x20, 0x0f, 0x01, 0x1f, 0x19, 0x48, 0x35, 0x35, 0xa6, 0xe8, 0x9a, 0x58,
|
---|
944 | 0x0c, 0x9b, 0x00, 0x03, 0xba, 0xf2, 0x14, 0x62, 0xec, 0xe9, 0x1a, 0x82,
|
---|
945 | 0xcc, 0x38, 0xdb, 0xdc, 0xae, 0x60, 0xd9, 0xc5, 0x4c
|
---|
946 | };
|
---|
947 |
|
---|
948 | static const unsigned char ecjpake_test_pms[] = {
|
---|
949 | 0xf3, 0xd4, 0x7f, 0x59, 0x98, 0x44, 0xdb, 0x92, 0xa5, 0x69, 0xbb, 0xe7,
|
---|
950 | 0x98, 0x1e, 0x39, 0xd9, 0x31, 0xfd, 0x74, 0x3b, 0xf2, 0x2e, 0x98, 0xf9,
|
---|
951 | 0xb4, 0x38, 0xf7, 0x19, 0xd3, 0xc4, 0xf3, 0x51
|
---|
952 | };
|
---|
953 |
|
---|
954 | /* Load my private keys and generate the correponding public keys */
|
---|
955 | static int ecjpake_test_load( mbedtls_ecjpake_context *ctx,
|
---|
956 | const unsigned char *xm1, size_t len1,
|
---|
957 | const unsigned char *xm2, size_t len2 )
|
---|
958 | {
|
---|
959 | int ret;
|
---|
960 |
|
---|
961 | MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &ctx->xm1, xm1, len1 ) );
|
---|
962 | MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &ctx->xm2, xm2, len2 ) );
|
---|
963 | MBEDTLS_MPI_CHK( mbedtls_ecp_mul( &ctx->grp, &ctx->Xm1, &ctx->xm1,
|
---|
964 | &ctx->grp.G, NULL, NULL ) );
|
---|
965 | MBEDTLS_MPI_CHK( mbedtls_ecp_mul( &ctx->grp, &ctx->Xm2, &ctx->xm2,
|
---|
966 | &ctx->grp.G, NULL, NULL ) );
|
---|
967 |
|
---|
968 | cleanup:
|
---|
969 | return( ret );
|
---|
970 | }
|
---|
971 |
|
---|
972 | /* For tests we don't need a secure RNG;
|
---|
973 | * use the LGC from Numerical Recipes for simplicity */
|
---|
974 | static int ecjpake_lgc( void *p, unsigned char *out, size_t len )
|
---|
975 | {
|
---|
976 | static uint32_t x = 42;
|
---|
977 | (void) p;
|
---|
978 |
|
---|
979 | while( len > 0 )
|
---|
980 | {
|
---|
981 | size_t use_len = len > 4 ? 4 : len;
|
---|
982 | x = 1664525 * x + 1013904223;
|
---|
983 | memcpy( out, &x, use_len );
|
---|
984 | out += use_len;
|
---|
985 | len -= use_len;
|
---|
986 | }
|
---|
987 |
|
---|
988 | return( 0 );
|
---|
989 | }
|
---|
990 |
|
---|
991 | #define TEST_ASSERT( x ) \
|
---|
992 | do { \
|
---|
993 | if( x ) \
|
---|
994 | ret = 0; \
|
---|
995 | else \
|
---|
996 | { \
|
---|
997 | ret = 1; \
|
---|
998 | goto cleanup; \
|
---|
999 | } \
|
---|
1000 | } while( 0 )
|
---|
1001 |
|
---|
1002 | /*
|
---|
1003 | * Checkup routine
|
---|
1004 | */
|
---|
1005 | int mbedtls_ecjpake_self_test( int verbose )
|
---|
1006 | {
|
---|
1007 | int ret;
|
---|
1008 | mbedtls_ecjpake_context cli;
|
---|
1009 | mbedtls_ecjpake_context srv;
|
---|
1010 | unsigned char buf[512], pms[32];
|
---|
1011 | size_t len, pmslen;
|
---|
1012 |
|
---|
1013 | mbedtls_ecjpake_init( &cli );
|
---|
1014 | mbedtls_ecjpake_init( &srv );
|
---|
1015 |
|
---|
1016 | if( verbose != 0 )
|
---|
1017 | mbedtls_printf( " ECJPAKE test #0 (setup): " );
|
---|
1018 |
|
---|
1019 | TEST_ASSERT( mbedtls_ecjpake_setup( &cli, MBEDTLS_ECJPAKE_CLIENT,
|
---|
1020 | MBEDTLS_MD_SHA256, MBEDTLS_ECP_DP_SECP256R1,
|
---|
1021 | ecjpake_test_password,
|
---|
1022 | sizeof( ecjpake_test_password ) ) == 0 );
|
---|
1023 |
|
---|
1024 | TEST_ASSERT( mbedtls_ecjpake_setup( &srv, MBEDTLS_ECJPAKE_SERVER,
|
---|
1025 | MBEDTLS_MD_SHA256, MBEDTLS_ECP_DP_SECP256R1,
|
---|
1026 | ecjpake_test_password,
|
---|
1027 | sizeof( ecjpake_test_password ) ) == 0 );
|
---|
1028 |
|
---|
1029 | if( verbose != 0 )
|
---|
1030 | mbedtls_printf( "passed\n" );
|
---|
1031 |
|
---|
1032 | if( verbose != 0 )
|
---|
1033 | mbedtls_printf( " ECJPAKE test #1 (random handshake): " );
|
---|
1034 |
|
---|
1035 | TEST_ASSERT( mbedtls_ecjpake_write_round_one( &cli,
|
---|
1036 | buf, sizeof( buf ), &len, ecjpake_lgc, NULL ) == 0 );
|
---|
1037 |
|
---|
1038 | TEST_ASSERT( mbedtls_ecjpake_read_round_one( &srv, buf, len ) == 0 );
|
---|
1039 |
|
---|
1040 | TEST_ASSERT( mbedtls_ecjpake_write_round_one( &srv,
|
---|
1041 | buf, sizeof( buf ), &len, ecjpake_lgc, NULL ) == 0 );
|
---|
1042 |
|
---|
1043 | TEST_ASSERT( mbedtls_ecjpake_read_round_one( &cli, buf, len ) == 0 );
|
---|
1044 |
|
---|
1045 | TEST_ASSERT( mbedtls_ecjpake_write_round_two( &srv,
|
---|
1046 | buf, sizeof( buf ), &len, ecjpake_lgc, NULL ) == 0 );
|
---|
1047 |
|
---|
1048 | TEST_ASSERT( mbedtls_ecjpake_read_round_two( &cli, buf, len ) == 0 );
|
---|
1049 |
|
---|
1050 | TEST_ASSERT( mbedtls_ecjpake_derive_secret( &cli,
|
---|
1051 | pms, sizeof( pms ), &pmslen, ecjpake_lgc, NULL ) == 0 );
|
---|
1052 |
|
---|
1053 | TEST_ASSERT( mbedtls_ecjpake_write_round_two( &cli,
|
---|
1054 | buf, sizeof( buf ), &len, ecjpake_lgc, NULL ) == 0 );
|
---|
1055 |
|
---|
1056 | TEST_ASSERT( mbedtls_ecjpake_read_round_two( &srv, buf, len ) == 0 );
|
---|
1057 |
|
---|
1058 | TEST_ASSERT( mbedtls_ecjpake_derive_secret( &srv,
|
---|
1059 | buf, sizeof( buf ), &len, ecjpake_lgc, NULL ) == 0 );
|
---|
1060 |
|
---|
1061 | TEST_ASSERT( len == pmslen );
|
---|
1062 | TEST_ASSERT( memcmp( buf, pms, len ) == 0 );
|
---|
1063 |
|
---|
1064 | if( verbose != 0 )
|
---|
1065 | mbedtls_printf( "passed\n" );
|
---|
1066 |
|
---|
1067 | if( verbose != 0 )
|
---|
1068 | mbedtls_printf( " ECJPAKE test #2 (reference handshake): " );
|
---|
1069 |
|
---|
1070 | /* Simulate generation of round one */
|
---|
1071 | MBEDTLS_MPI_CHK( ecjpake_test_load( &cli,
|
---|
1072 | ecjpake_test_x1, sizeof( ecjpake_test_x1 ),
|
---|
1073 | ecjpake_test_x2, sizeof( ecjpake_test_x2 ) ) );
|
---|
1074 |
|
---|
1075 | MBEDTLS_MPI_CHK( ecjpake_test_load( &srv,
|
---|
1076 | ecjpake_test_x3, sizeof( ecjpake_test_x3 ),
|
---|
1077 | ecjpake_test_x4, sizeof( ecjpake_test_x4 ) ) );
|
---|
1078 |
|
---|
1079 | /* Read round one */
|
---|
1080 | TEST_ASSERT( mbedtls_ecjpake_read_round_one( &srv,
|
---|
1081 | ecjpake_test_cli_one,
|
---|
1082 | sizeof( ecjpake_test_cli_one ) ) == 0 );
|
---|
1083 |
|
---|
1084 | TEST_ASSERT( mbedtls_ecjpake_read_round_one( &cli,
|
---|
1085 | ecjpake_test_srv_one,
|
---|
1086 | sizeof( ecjpake_test_srv_one ) ) == 0 );
|
---|
1087 |
|
---|
1088 | /* Skip generation of round two, read round two */
|
---|
1089 | TEST_ASSERT( mbedtls_ecjpake_read_round_two( &cli,
|
---|
1090 | ecjpake_test_srv_two,
|
---|
1091 | sizeof( ecjpake_test_srv_two ) ) == 0 );
|
---|
1092 |
|
---|
1093 | TEST_ASSERT( mbedtls_ecjpake_read_round_two( &srv,
|
---|
1094 | ecjpake_test_cli_two,
|
---|
1095 | sizeof( ecjpake_test_cli_two ) ) == 0 );
|
---|
1096 |
|
---|
1097 | /* Server derives PMS */
|
---|
1098 | TEST_ASSERT( mbedtls_ecjpake_derive_secret( &srv,
|
---|
1099 | buf, sizeof( buf ), &len, ecjpake_lgc, NULL ) == 0 );
|
---|
1100 |
|
---|
1101 | TEST_ASSERT( len == sizeof( ecjpake_test_pms ) );
|
---|
1102 | TEST_ASSERT( memcmp( buf, ecjpake_test_pms, len ) == 0 );
|
---|
1103 |
|
---|
1104 | memset( buf, 0, len ); /* Avoid interferences with next step */
|
---|
1105 |
|
---|
1106 | /* Client derives PMS */
|
---|
1107 | TEST_ASSERT( mbedtls_ecjpake_derive_secret( &cli,
|
---|
1108 | buf, sizeof( buf ), &len, ecjpake_lgc, NULL ) == 0 );
|
---|
1109 |
|
---|
1110 | TEST_ASSERT( len == sizeof( ecjpake_test_pms ) );
|
---|
1111 | TEST_ASSERT( memcmp( buf, ecjpake_test_pms, len ) == 0 );
|
---|
1112 |
|
---|
1113 | if( verbose != 0 )
|
---|
1114 | mbedtls_printf( "passed\n" );
|
---|
1115 |
|
---|
1116 | cleanup:
|
---|
1117 | mbedtls_ecjpake_free( &cli );
|
---|
1118 | mbedtls_ecjpake_free( &srv );
|
---|
1119 |
|
---|
1120 | if( ret != 0 )
|
---|
1121 | {
|
---|
1122 | if( verbose != 0 )
|
---|
1123 | mbedtls_printf( "failed\n" );
|
---|
1124 |
|
---|
1125 | ret = 1;
|
---|
1126 | }
|
---|
1127 |
|
---|
1128 | if( verbose != 0 )
|
---|
1129 | mbedtls_printf( "\n" );
|
---|
1130 |
|
---|
1131 | return( ret );
|
---|
1132 | }
|
---|
1133 |
|
---|
1134 | #undef TEST_ASSERT
|
---|
1135 |
|
---|
1136 | #endif /* MBEDTLS_ECP_DP_SECP256R1_ENABLED && MBEDTLS_SHA256_C */
|
---|
1137 |
|
---|
1138 | #endif /* MBEDTLS_SELF_TEST */
|
---|
1139 |
|
---|
1140 | #endif /* MBEDTLS_ECJPAKE_C */
|
---|