1 | /*
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2 | * Public Key abstraction layer
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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 | #if !defined(MBEDTLS_CONFIG_FILE)
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23 | #include "mbedtls/config.h"
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24 | #else
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25 | #include MBEDTLS_CONFIG_FILE
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26 | #endif
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27 |
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28 | #if defined(MBEDTLS_PK_C)
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29 | #include "mbedtls/pk.h"
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30 | #include "mbedtls/pk_internal.h"
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31 |
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32 | #include "mbedtls/platform_util.h"
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33 |
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34 | #if defined(MBEDTLS_RSA_C)
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35 | #include "mbedtls/rsa.h"
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36 | #endif
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37 | #if defined(MBEDTLS_ECP_C)
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38 | #include "mbedtls/ecp.h"
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39 | #endif
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40 | #if defined(MBEDTLS_ECDSA_C)
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41 | #include "mbedtls/ecdsa.h"
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42 | #endif
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43 |
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44 | #include <limits.h>
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45 | #include <stdint.h>
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46 |
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47 | /* Parameter validation macros based on platform_util.h */
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48 | #define PK_VALIDATE_RET( cond ) \
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49 | MBEDTLS_INTERNAL_VALIDATE_RET( cond, MBEDTLS_ERR_PK_BAD_INPUT_DATA )
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50 | #define PK_VALIDATE( cond ) \
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51 | MBEDTLS_INTERNAL_VALIDATE( cond )
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52 |
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53 | /*
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54 | * Initialise a mbedtls_pk_context
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55 | */
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56 | void mbedtls_pk_init( mbedtls_pk_context *ctx )
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57 | {
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58 | PK_VALIDATE( ctx != NULL );
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59 |
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60 | ctx->pk_info = NULL;
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61 | ctx->pk_ctx = NULL;
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62 | }
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63 |
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64 | /*
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65 | * Free (the components of) a mbedtls_pk_context
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66 | */
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67 | void mbedtls_pk_free( mbedtls_pk_context *ctx )
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68 | {
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69 | if( ctx == NULL )
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70 | return;
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71 |
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72 | if ( ctx->pk_info != NULL )
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73 | ctx->pk_info->ctx_free_func( ctx->pk_ctx );
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74 |
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75 | mbedtls_platform_zeroize( ctx, sizeof( mbedtls_pk_context ) );
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76 | }
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77 |
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78 | #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
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79 | /*
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80 | * Initialize a restart context
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81 | */
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82 | void mbedtls_pk_restart_init( mbedtls_pk_restart_ctx *ctx )
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83 | {
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84 | PK_VALIDATE( ctx != NULL );
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85 | ctx->pk_info = NULL;
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86 | ctx->rs_ctx = NULL;
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87 | }
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88 |
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89 | /*
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90 | * Free the components of a restart context
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91 | */
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92 | void mbedtls_pk_restart_free( mbedtls_pk_restart_ctx *ctx )
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93 | {
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94 | if( ctx == NULL || ctx->pk_info == NULL ||
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95 | ctx->pk_info->rs_free_func == NULL )
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96 | {
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97 | return;
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98 | }
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99 |
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100 | ctx->pk_info->rs_free_func( ctx->rs_ctx );
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101 |
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102 | ctx->pk_info = NULL;
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103 | ctx->rs_ctx = NULL;
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104 | }
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105 | #endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
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106 |
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107 | /*
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108 | * Get pk_info structure from type
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109 | */
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110 | const mbedtls_pk_info_t * mbedtls_pk_info_from_type( mbedtls_pk_type_t pk_type )
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111 | {
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112 | switch( pk_type ) {
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113 | #if defined(MBEDTLS_RSA_C)
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114 | case MBEDTLS_PK_RSA:
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115 | return( &mbedtls_rsa_info );
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116 | #endif
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117 | #if defined(MBEDTLS_ECP_C)
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118 | case MBEDTLS_PK_ECKEY:
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119 | return( &mbedtls_eckey_info );
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120 | case MBEDTLS_PK_ECKEY_DH:
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121 | return( &mbedtls_eckeydh_info );
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122 | #endif
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123 | #if defined(MBEDTLS_ECDSA_C)
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124 | case MBEDTLS_PK_ECDSA:
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125 | return( &mbedtls_ecdsa_info );
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126 | #endif
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127 | /* MBEDTLS_PK_RSA_ALT omitted on purpose */
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128 | default:
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129 | return( NULL );
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130 | }
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131 | }
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132 |
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133 | /*
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134 | * Initialise context
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135 | */
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136 | int mbedtls_pk_setup( mbedtls_pk_context *ctx, const mbedtls_pk_info_t *info )
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137 | {
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138 | PK_VALIDATE_RET( ctx != NULL );
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139 | if( info == NULL || ctx->pk_info != NULL )
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140 | return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
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141 |
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142 | if( ( ctx->pk_ctx = info->ctx_alloc_func() ) == NULL )
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143 | return( MBEDTLS_ERR_PK_ALLOC_FAILED );
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144 |
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145 | ctx->pk_info = info;
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146 |
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147 | return( 0 );
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148 | }
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149 |
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150 | #if defined(MBEDTLS_PK_RSA_ALT_SUPPORT)
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151 | /*
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152 | * Initialize an RSA-alt context
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153 | */
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154 | int mbedtls_pk_setup_rsa_alt( mbedtls_pk_context *ctx, void * key,
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155 | mbedtls_pk_rsa_alt_decrypt_func decrypt_func,
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156 | mbedtls_pk_rsa_alt_sign_func sign_func,
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157 | mbedtls_pk_rsa_alt_key_len_func key_len_func )
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158 | {
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159 | mbedtls_rsa_alt_context *rsa_alt;
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160 | const mbedtls_pk_info_t *info = &mbedtls_rsa_alt_info;
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161 |
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162 | PK_VALIDATE_RET( ctx != NULL );
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163 | if( ctx->pk_info != NULL )
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164 | return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
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165 |
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166 | if( ( ctx->pk_ctx = info->ctx_alloc_func() ) == NULL )
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167 | return( MBEDTLS_ERR_PK_ALLOC_FAILED );
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168 |
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169 | ctx->pk_info = info;
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170 |
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171 | rsa_alt = (mbedtls_rsa_alt_context *) ctx->pk_ctx;
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172 |
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173 | rsa_alt->key = key;
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174 | rsa_alt->decrypt_func = decrypt_func;
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175 | rsa_alt->sign_func = sign_func;
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176 | rsa_alt->key_len_func = key_len_func;
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177 |
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178 | return( 0 );
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179 | }
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180 | #endif /* MBEDTLS_PK_RSA_ALT_SUPPORT */
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181 |
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182 | /*
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183 | * Tell if a PK can do the operations of the given type
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184 | */
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185 | int mbedtls_pk_can_do( const mbedtls_pk_context *ctx, mbedtls_pk_type_t type )
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186 | {
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187 | /* A context with null pk_info is not set up yet and can't do anything.
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188 | * For backward compatibility, also accept NULL instead of a context
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189 | * pointer. */
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190 | if( ctx == NULL || ctx->pk_info == NULL )
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191 | return( 0 );
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192 |
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193 | return( ctx->pk_info->can_do( type ) );
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194 | }
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195 |
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196 | /*
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197 | * Helper for mbedtls_pk_sign and mbedtls_pk_verify
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198 | */
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199 | static inline int pk_hashlen_helper( mbedtls_md_type_t md_alg, size_t *hash_len )
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200 | {
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201 | const mbedtls_md_info_t *md_info;
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202 |
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203 | if( *hash_len != 0 )
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204 | return( 0 );
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205 |
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206 | if( ( md_info = mbedtls_md_info_from_type( md_alg ) ) == NULL )
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207 | return( -1 );
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208 |
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209 | *hash_len = mbedtls_md_get_size( md_info );
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210 | return( 0 );
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211 | }
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212 |
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213 | #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
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214 | /*
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215 | * Helper to set up a restart context if needed
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216 | */
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217 | static int pk_restart_setup( mbedtls_pk_restart_ctx *ctx,
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218 | const mbedtls_pk_info_t *info )
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219 | {
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220 | /* Don't do anything if already set up or invalid */
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221 | if( ctx == NULL || ctx->pk_info != NULL )
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222 | return( 0 );
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223 |
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224 | /* Should never happen when we're called */
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225 | if( info->rs_alloc_func == NULL || info->rs_free_func == NULL )
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226 | return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
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227 |
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228 | if( ( ctx->rs_ctx = info->rs_alloc_func() ) == NULL )
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229 | return( MBEDTLS_ERR_PK_ALLOC_FAILED );
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230 |
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231 | ctx->pk_info = info;
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232 |
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233 | return( 0 );
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234 | }
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235 | #endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
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236 |
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237 | /*
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238 | * Verify a signature (restartable)
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239 | */
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240 | int mbedtls_pk_verify_restartable( mbedtls_pk_context *ctx,
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241 | mbedtls_md_type_t md_alg,
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242 | const unsigned char *hash, size_t hash_len,
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243 | const unsigned char *sig, size_t sig_len,
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244 | mbedtls_pk_restart_ctx *rs_ctx )
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245 | {
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246 | PK_VALIDATE_RET( ctx != NULL );
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247 | PK_VALIDATE_RET( ( md_alg == MBEDTLS_MD_NONE && hash_len == 0 ) ||
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248 | hash != NULL );
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249 | PK_VALIDATE_RET( sig != NULL );
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250 |
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251 | if( ctx->pk_info == NULL ||
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252 | pk_hashlen_helper( md_alg, &hash_len ) != 0 )
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253 | return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
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254 |
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255 | #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
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256 | /* optimization: use non-restartable version if restart disabled */
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257 | if( rs_ctx != NULL &&
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258 | mbedtls_ecp_restart_is_enabled() &&
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259 | ctx->pk_info->verify_rs_func != NULL )
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260 | {
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261 | int ret;
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262 |
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263 | if( ( ret = pk_restart_setup( rs_ctx, ctx->pk_info ) ) != 0 )
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264 | return( ret );
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265 |
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266 | ret = ctx->pk_info->verify_rs_func( ctx->pk_ctx,
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267 | md_alg, hash, hash_len, sig, sig_len, rs_ctx->rs_ctx );
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268 |
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269 | if( ret != MBEDTLS_ERR_ECP_IN_PROGRESS )
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270 | mbedtls_pk_restart_free( rs_ctx );
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271 |
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272 | return( ret );
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273 | }
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274 | #else /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
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275 | (void) rs_ctx;
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276 | #endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
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277 |
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278 | if( ctx->pk_info->verify_func == NULL )
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279 | return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
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280 |
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281 | return( ctx->pk_info->verify_func( ctx->pk_ctx, md_alg, hash, hash_len,
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282 | sig, sig_len ) );
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283 | }
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284 |
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285 | /*
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286 | * Verify a signature
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287 | */
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288 | int mbedtls_pk_verify( mbedtls_pk_context *ctx, mbedtls_md_type_t md_alg,
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289 | const unsigned char *hash, size_t hash_len,
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290 | const unsigned char *sig, size_t sig_len )
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291 | {
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292 | return( mbedtls_pk_verify_restartable( ctx, md_alg, hash, hash_len,
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293 | sig, sig_len, NULL ) );
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294 | }
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295 |
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296 | /*
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297 | * Verify a signature with options
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298 | */
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299 | int mbedtls_pk_verify_ext( mbedtls_pk_type_t type, const void *options,
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300 | mbedtls_pk_context *ctx, mbedtls_md_type_t md_alg,
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301 | const unsigned char *hash, size_t hash_len,
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302 | const unsigned char *sig, size_t sig_len )
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303 | {
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304 | PK_VALIDATE_RET( ctx != NULL );
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305 | PK_VALIDATE_RET( ( md_alg == MBEDTLS_MD_NONE && hash_len == 0 ) ||
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306 | hash != NULL );
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307 | PK_VALIDATE_RET( sig != NULL );
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308 |
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309 | if( ctx->pk_info == NULL )
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310 | return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
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311 |
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312 | if( ! mbedtls_pk_can_do( ctx, type ) )
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313 | return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
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314 |
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315 | if( type == MBEDTLS_PK_RSASSA_PSS )
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316 | {
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317 | #if defined(MBEDTLS_RSA_C) && defined(MBEDTLS_PKCS1_V21)
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318 | int ret;
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319 | const mbedtls_pk_rsassa_pss_options *pss_opts;
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320 |
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321 | #if SIZE_MAX > UINT_MAX
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322 | if( md_alg == MBEDTLS_MD_NONE && UINT_MAX < hash_len )
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323 | return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
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324 | #endif /* SIZE_MAX > UINT_MAX */
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325 |
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326 | if( options == NULL )
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327 | return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
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328 |
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329 | pss_opts = (const mbedtls_pk_rsassa_pss_options *) options;
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330 |
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331 | if( sig_len < mbedtls_pk_get_len( ctx ) )
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332 | return( MBEDTLS_ERR_RSA_VERIFY_FAILED );
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333 |
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334 | ret = mbedtls_rsa_rsassa_pss_verify_ext( mbedtls_pk_rsa( *ctx ),
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335 | NULL, NULL, MBEDTLS_RSA_PUBLIC,
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336 | md_alg, (unsigned int) hash_len, hash,
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337 | pss_opts->mgf1_hash_id,
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338 | pss_opts->expected_salt_len,
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339 | sig );
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340 | if( ret != 0 )
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341 | return( ret );
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342 |
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343 | if( sig_len > mbedtls_pk_get_len( ctx ) )
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344 | return( MBEDTLS_ERR_PK_SIG_LEN_MISMATCH );
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345 |
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346 | return( 0 );
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347 | #else
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348 | return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
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349 | #endif /* MBEDTLS_RSA_C && MBEDTLS_PKCS1_V21 */
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350 | }
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351 |
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352 | /* General case: no options */
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353 | if( options != NULL )
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354 | return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
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355 |
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356 | return( mbedtls_pk_verify( ctx, md_alg, hash, hash_len, sig, sig_len ) );
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357 | }
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358 |
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359 | /*
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360 | * Make a signature (restartable)
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361 | */
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362 | int mbedtls_pk_sign_restartable( mbedtls_pk_context *ctx,
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363 | mbedtls_md_type_t md_alg,
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364 | const unsigned char *hash, size_t hash_len,
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365 | unsigned char *sig, size_t *sig_len,
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366 | int (*f_rng)(void *, unsigned char *, size_t), void *p_rng,
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367 | mbedtls_pk_restart_ctx *rs_ctx )
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368 | {
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369 | PK_VALIDATE_RET( ctx != NULL );
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370 | PK_VALIDATE_RET( ( md_alg == MBEDTLS_MD_NONE && hash_len == 0 ) ||
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371 | hash != NULL );
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372 | PK_VALIDATE_RET( sig != NULL );
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373 |
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374 | if( ctx->pk_info == NULL ||
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375 | pk_hashlen_helper( md_alg, &hash_len ) != 0 )
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376 | return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
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377 |
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378 | #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
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379 | /* optimization: use non-restartable version if restart disabled */
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380 | if( rs_ctx != NULL &&
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381 | mbedtls_ecp_restart_is_enabled() &&
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382 | ctx->pk_info->sign_rs_func != NULL )
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383 | {
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384 | int ret;
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385 |
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386 | if( ( ret = pk_restart_setup( rs_ctx, ctx->pk_info ) ) != 0 )
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387 | return( ret );
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388 |
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389 | ret = ctx->pk_info->sign_rs_func( ctx->pk_ctx, md_alg,
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390 | hash, hash_len, sig, sig_len, f_rng, p_rng, rs_ctx->rs_ctx );
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391 |
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392 | if( ret != MBEDTLS_ERR_ECP_IN_PROGRESS )
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393 | mbedtls_pk_restart_free( rs_ctx );
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394 |
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395 | return( ret );
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396 | }
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397 | #else /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
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398 | (void) rs_ctx;
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399 | #endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
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400 |
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401 | if( ctx->pk_info->sign_func == NULL )
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402 | return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
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403 |
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404 | return( ctx->pk_info->sign_func( ctx->pk_ctx, md_alg, hash, hash_len,
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405 | sig, sig_len, f_rng, p_rng ) );
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406 | }
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407 |
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408 | /*
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409 | * Make a signature
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410 | */
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411 | int mbedtls_pk_sign( mbedtls_pk_context *ctx, mbedtls_md_type_t md_alg,
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412 | const unsigned char *hash, size_t hash_len,
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413 | unsigned char *sig, size_t *sig_len,
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414 | int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
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415 | {
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416 | return( mbedtls_pk_sign_restartable( ctx, md_alg, hash, hash_len,
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417 | sig, sig_len, f_rng, p_rng, NULL ) );
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418 | }
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419 |
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420 | /*
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421 | * Decrypt message
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422 | */
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423 | int mbedtls_pk_decrypt( mbedtls_pk_context *ctx,
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424 | const unsigned char *input, size_t ilen,
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425 | unsigned char *output, size_t *olen, size_t osize,
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426 | int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
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427 | {
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428 | PK_VALIDATE_RET( ctx != NULL );
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429 | PK_VALIDATE_RET( input != NULL || ilen == 0 );
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430 | PK_VALIDATE_RET( output != NULL || osize == 0 );
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431 | PK_VALIDATE_RET( olen != NULL );
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432 |
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433 | if( ctx->pk_info == NULL )
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434 | return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
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435 |
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436 | if( ctx->pk_info->decrypt_func == NULL )
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437 | return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
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438 |
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439 | return( ctx->pk_info->decrypt_func( ctx->pk_ctx, input, ilen,
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440 | output, olen, osize, f_rng, p_rng ) );
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441 | }
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442 |
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443 | /*
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444 | * Encrypt message
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445 | */
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446 | int mbedtls_pk_encrypt( mbedtls_pk_context *ctx,
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447 | const unsigned char *input, size_t ilen,
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448 | unsigned char *output, size_t *olen, size_t osize,
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449 | int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
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450 | {
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451 | PK_VALIDATE_RET( ctx != NULL );
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452 | PK_VALIDATE_RET( input != NULL || ilen == 0 );
|
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453 | PK_VALIDATE_RET( output != NULL || osize == 0 );
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454 | PK_VALIDATE_RET( olen != NULL );
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455 |
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456 | if( ctx->pk_info == NULL )
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457 | return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
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458 |
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459 | if( ctx->pk_info->encrypt_func == NULL )
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460 | return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
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461 |
|
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462 | return( ctx->pk_info->encrypt_func( ctx->pk_ctx, input, ilen,
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463 | output, olen, osize, f_rng, p_rng ) );
|
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464 | }
|
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465 |
|
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466 | /*
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467 | * Check public-private key pair
|
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468 | */
|
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469 | int mbedtls_pk_check_pair( const mbedtls_pk_context *pub, const mbedtls_pk_context *prv )
|
---|
470 | {
|
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471 | PK_VALIDATE_RET( pub != NULL );
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472 | PK_VALIDATE_RET( prv != NULL );
|
---|
473 |
|
---|
474 | if( pub->pk_info == NULL ||
|
---|
475 | prv->pk_info == NULL ||
|
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476 | prv->pk_info->check_pair_func == NULL )
|
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477 | {
|
---|
478 | return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
|
---|
479 | }
|
---|
480 |
|
---|
481 | if( prv->pk_info->type == MBEDTLS_PK_RSA_ALT )
|
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482 | {
|
---|
483 | if( pub->pk_info->type != MBEDTLS_PK_RSA )
|
---|
484 | return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
|
---|
485 | }
|
---|
486 | else
|
---|
487 | {
|
---|
488 | if( pub->pk_info != prv->pk_info )
|
---|
489 | return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
|
---|
490 | }
|
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491 |
|
---|
492 | return( prv->pk_info->check_pair_func( pub->pk_ctx, prv->pk_ctx ) );
|
---|
493 | }
|
---|
494 |
|
---|
495 | /*
|
---|
496 | * Get key size in bits
|
---|
497 | */
|
---|
498 | size_t mbedtls_pk_get_bitlen( const mbedtls_pk_context *ctx )
|
---|
499 | {
|
---|
500 | /* For backward compatibility, accept NULL or a context that
|
---|
501 | * isn't set up yet, and return a fake value that should be safe. */
|
---|
502 | if( ctx == NULL || ctx->pk_info == NULL )
|
---|
503 | return( 0 );
|
---|
504 |
|
---|
505 | return( ctx->pk_info->get_bitlen( ctx->pk_ctx ) );
|
---|
506 | }
|
---|
507 |
|
---|
508 | /*
|
---|
509 | * Export debug information
|
---|
510 | */
|
---|
511 | int mbedtls_pk_debug( const mbedtls_pk_context *ctx, mbedtls_pk_debug_item *items )
|
---|
512 | {
|
---|
513 | PK_VALIDATE_RET( ctx != NULL );
|
---|
514 | if( ctx->pk_info == NULL )
|
---|
515 | return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
|
---|
516 |
|
---|
517 | if( ctx->pk_info->debug_func == NULL )
|
---|
518 | return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
|
---|
519 |
|
---|
520 | ctx->pk_info->debug_func( ctx->pk_ctx, items );
|
---|
521 | return( 0 );
|
---|
522 | }
|
---|
523 |
|
---|
524 | /*
|
---|
525 | * Access the PK type name
|
---|
526 | */
|
---|
527 | const char *mbedtls_pk_get_name( const mbedtls_pk_context *ctx )
|
---|
528 | {
|
---|
529 | if( ctx == NULL || ctx->pk_info == NULL )
|
---|
530 | return( "invalid PK" );
|
---|
531 |
|
---|
532 | return( ctx->pk_info->name );
|
---|
533 | }
|
---|
534 |
|
---|
535 | /*
|
---|
536 | * Access the PK type
|
---|
537 | */
|
---|
538 | mbedtls_pk_type_t mbedtls_pk_get_type( const mbedtls_pk_context *ctx )
|
---|
539 | {
|
---|
540 | if( ctx == NULL || ctx->pk_info == NULL )
|
---|
541 | return( MBEDTLS_PK_NONE );
|
---|
542 |
|
---|
543 | return( ctx->pk_info->type );
|
---|
544 | }
|
---|
545 |
|
---|
546 | #endif /* MBEDTLS_PK_C */
|
---|