1 | /*
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2 | * HMAC_DRBG implementation (NIST SP 800-90)
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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 | * The NIST SP 800-90A DRBGs are described in the following publication.
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24 | * http://csrc.nist.gov/publications/nistpubs/800-90A/SP800-90A.pdf
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25 | * References below are based on rev. 1 (January 2012).
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26 | */
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27 |
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28 | #if !defined(MBEDTLS_CONFIG_FILE)
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29 | #include "mbedtls/config.h"
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30 | #else
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31 | #include MBEDTLS_CONFIG_FILE
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32 | #endif
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33 |
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34 | #if defined(MBEDTLS_HMAC_DRBG_C)
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35 |
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36 | #include "mbedtls/hmac_drbg.h"
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37 | #include "mbedtls/platform_util.h"
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38 |
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39 | #include <string.h>
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40 |
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41 | #if defined(MBEDTLS_FS_IO)
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42 | #include <stdio.h>
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43 | #endif
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44 |
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45 | #if defined(MBEDTLS_SELF_TEST)
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46 | #if defined(MBEDTLS_PLATFORM_C)
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47 | #include "mbedtls/platform.h"
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48 | #else
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49 | #include <stdio.h>
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50 | #define mbedtls_printf printf
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51 | #endif /* MBEDTLS_SELF_TEST */
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52 | #endif /* MBEDTLS_PLATFORM_C */
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53 |
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54 | /*
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55 | * HMAC_DRBG context initialization
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56 | */
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57 | void mbedtls_hmac_drbg_init( mbedtls_hmac_drbg_context *ctx )
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58 | {
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59 | memset( ctx, 0, sizeof( mbedtls_hmac_drbg_context ) );
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60 |
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61 | #if defined(MBEDTLS_THREADING_C)
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62 | mbedtls_mutex_init( &ctx->mutex );
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63 | #endif
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64 | }
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65 |
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66 | /*
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67 | * HMAC_DRBG update, using optional additional data (10.1.2.2)
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68 | */
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69 | int mbedtls_hmac_drbg_update_ret( mbedtls_hmac_drbg_context *ctx,
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70 | const unsigned char *additional,
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71 | size_t add_len )
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72 | {
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73 | size_t md_len = mbedtls_md_get_size( ctx->md_ctx.md_info );
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74 | unsigned char rounds = ( additional != NULL && add_len != 0 ) ? 2 : 1;
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75 | unsigned char sep[1];
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76 | unsigned char K[MBEDTLS_MD_MAX_SIZE];
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77 | int ret;
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78 |
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79 | for( sep[0] = 0; sep[0] < rounds; sep[0]++ )
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80 | {
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81 | /* Step 1 or 4 */
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82 | if( ( ret = mbedtls_md_hmac_reset( &ctx->md_ctx ) ) != 0 )
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83 | goto exit;
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84 | if( ( ret = mbedtls_md_hmac_update( &ctx->md_ctx,
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85 | ctx->V, md_len ) ) != 0 )
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86 | goto exit;
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87 | if( ( ret = mbedtls_md_hmac_update( &ctx->md_ctx,
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88 | sep, 1 ) ) != 0 )
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89 | goto exit;
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90 | if( rounds == 2 )
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91 | {
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92 | if( ( ret = mbedtls_md_hmac_update( &ctx->md_ctx,
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93 | additional, add_len ) ) != 0 )
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94 | goto exit;
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95 | }
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96 | if( ( ret = mbedtls_md_hmac_finish( &ctx->md_ctx, K ) ) != 0 )
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97 | goto exit;
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98 |
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99 | /* Step 2 or 5 */
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100 | if( ( ret = mbedtls_md_hmac_starts( &ctx->md_ctx, K, md_len ) ) != 0 )
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101 | goto exit;
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102 | if( ( ret = mbedtls_md_hmac_update( &ctx->md_ctx,
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103 | ctx->V, md_len ) ) != 0 )
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104 | goto exit;
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105 | if( ( ret = mbedtls_md_hmac_finish( &ctx->md_ctx, ctx->V ) ) != 0 )
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106 | goto exit;
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107 | }
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108 |
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109 | exit:
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110 | mbedtls_platform_zeroize( K, sizeof( K ) );
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111 | return( ret );
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112 | }
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113 |
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114 | #if !defined(MBEDTLS_DEPRECATED_REMOVED)
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115 | void mbedtls_hmac_drbg_update( mbedtls_hmac_drbg_context *ctx,
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116 | const unsigned char *additional,
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117 | size_t add_len )
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118 | {
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119 | (void) mbedtls_hmac_drbg_update_ret( ctx, additional, add_len );
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120 | }
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121 | #endif /* MBEDTLS_DEPRECATED_REMOVED */
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122 |
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123 | /*
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124 | * Simplified HMAC_DRBG initialisation (for use with deterministic ECDSA)
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125 | */
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126 | int mbedtls_hmac_drbg_seed_buf( mbedtls_hmac_drbg_context *ctx,
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127 | const mbedtls_md_info_t * md_info,
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128 | const unsigned char *data, size_t data_len )
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129 | {
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130 | int ret;
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131 |
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132 | if( ( ret = mbedtls_md_setup( &ctx->md_ctx, md_info, 1 ) ) != 0 )
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133 | return( ret );
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134 |
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135 | /*
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136 | * Set initial working state.
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137 | * Use the V memory location, which is currently all 0, to initialize the
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138 | * MD context with an all-zero key. Then set V to its initial value.
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139 | */
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140 | if( ( ret = mbedtls_md_hmac_starts( &ctx->md_ctx, ctx->V,
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141 | mbedtls_md_get_size( md_info ) ) ) != 0 )
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142 | return( ret );
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143 | memset( ctx->V, 0x01, mbedtls_md_get_size( md_info ) );
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144 |
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145 | if( ( ret = mbedtls_hmac_drbg_update_ret( ctx, data, data_len ) ) != 0 )
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146 | return( ret );
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147 |
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148 | return( 0 );
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149 | }
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150 |
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151 | /*
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152 | * HMAC_DRBG reseeding: 10.1.2.4 (arabic) + 9.2 (Roman)
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153 | */
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154 | int mbedtls_hmac_drbg_reseed( mbedtls_hmac_drbg_context *ctx,
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155 | const unsigned char *additional, size_t len )
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156 | {
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157 | unsigned char seed[MBEDTLS_HMAC_DRBG_MAX_SEED_INPUT];
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158 | size_t seedlen;
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159 | int ret;
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160 |
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161 | /* III. Check input length */
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162 | if( len > MBEDTLS_HMAC_DRBG_MAX_INPUT ||
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163 | ctx->entropy_len + len > MBEDTLS_HMAC_DRBG_MAX_SEED_INPUT )
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164 | {
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165 | return( MBEDTLS_ERR_HMAC_DRBG_INPUT_TOO_BIG );
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166 | }
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167 |
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168 | memset( seed, 0, MBEDTLS_HMAC_DRBG_MAX_SEED_INPUT );
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169 |
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170 | /* IV. Gather entropy_len bytes of entropy for the seed */
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171 | if( ( ret = ctx->f_entropy( ctx->p_entropy,
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172 | seed, ctx->entropy_len ) ) != 0 )
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173 | return( MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED );
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174 |
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175 | seedlen = ctx->entropy_len;
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176 |
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177 | /* 1. Concatenate entropy and additional data if any */
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178 | if( additional != NULL && len != 0 )
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179 | {
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180 | memcpy( seed + seedlen, additional, len );
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181 | seedlen += len;
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182 | }
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183 |
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184 | /* 2. Update state */
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185 | if( ( ret = mbedtls_hmac_drbg_update_ret( ctx, seed, seedlen ) ) != 0 )
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186 | goto exit;
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187 |
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188 | /* 3. Reset reseed_counter */
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189 | ctx->reseed_counter = 1;
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190 |
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191 | exit:
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192 | /* 4. Done */
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193 | mbedtls_platform_zeroize( seed, seedlen );
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194 | return( ret );
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195 | }
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196 |
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197 | /*
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198 | * HMAC_DRBG initialisation (10.1.2.3 + 9.1)
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199 | */
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200 | int mbedtls_hmac_drbg_seed( mbedtls_hmac_drbg_context *ctx,
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201 | const mbedtls_md_info_t * md_info,
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202 | int (*f_entropy)(void *, unsigned char *, size_t),
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203 | void *p_entropy,
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204 | const unsigned char *custom,
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205 | size_t len )
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206 | {
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207 | int ret;
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208 | size_t entropy_len, md_size;
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209 |
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210 | if( ( ret = mbedtls_md_setup( &ctx->md_ctx, md_info, 1 ) ) != 0 )
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211 | return( ret );
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212 |
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213 | md_size = mbedtls_md_get_size( md_info );
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214 |
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215 | /*
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216 | * Set initial working state.
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217 | * Use the V memory location, which is currently all 0, to initialize the
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218 | * MD context with an all-zero key. Then set V to its initial value.
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219 | */
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220 | if( ( ret = mbedtls_md_hmac_starts( &ctx->md_ctx, ctx->V, md_size ) ) != 0 )
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221 | return( ret );
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222 | memset( ctx->V, 0x01, md_size );
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223 |
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224 | ctx->f_entropy = f_entropy;
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225 | ctx->p_entropy = p_entropy;
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226 |
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227 | ctx->reseed_interval = MBEDTLS_HMAC_DRBG_RESEED_INTERVAL;
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228 |
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229 | /*
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230 | * See SP800-57 5.6.1 (p. 65-66) for the security strength provided by
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231 | * each hash function, then according to SP800-90A rev1 10.1 table 2,
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232 | * min_entropy_len (in bits) is security_strength.
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233 | *
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234 | * (This also matches the sizes used in the NIST test vectors.)
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235 | */
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236 | entropy_len = md_size <= 20 ? 16 : /* 160-bits hash -> 128 bits */
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237 | md_size <= 28 ? 24 : /* 224-bits hash -> 192 bits */
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238 | 32; /* better (256+) -> 256 bits */
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239 |
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240 | /*
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241 | * For initialisation, use more entropy to emulate a nonce
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242 | * (Again, matches test vectors.)
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243 | */
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244 | ctx->entropy_len = entropy_len * 3 / 2;
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245 |
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246 | if( ( ret = mbedtls_hmac_drbg_reseed( ctx, custom, len ) ) != 0 )
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247 | return( ret );
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248 |
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249 | ctx->entropy_len = entropy_len;
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250 |
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251 | return( 0 );
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252 | }
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253 |
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254 | /*
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255 | * Set prediction resistance
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256 | */
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257 | void mbedtls_hmac_drbg_set_prediction_resistance( mbedtls_hmac_drbg_context *ctx,
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258 | int resistance )
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259 | {
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260 | ctx->prediction_resistance = resistance;
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261 | }
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262 |
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263 | /*
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264 | * Set entropy length grabbed for reseeds
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265 | */
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266 | void mbedtls_hmac_drbg_set_entropy_len( mbedtls_hmac_drbg_context *ctx, size_t len )
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267 | {
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268 | ctx->entropy_len = len;
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269 | }
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270 |
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271 | /*
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272 | * Set reseed interval
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273 | */
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274 | void mbedtls_hmac_drbg_set_reseed_interval( mbedtls_hmac_drbg_context *ctx, int interval )
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275 | {
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276 | ctx->reseed_interval = interval;
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277 | }
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278 |
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279 | /*
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280 | * HMAC_DRBG random function with optional additional data:
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281 | * 10.1.2.5 (arabic) + 9.3 (Roman)
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282 | */
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283 | int mbedtls_hmac_drbg_random_with_add( void *p_rng,
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284 | unsigned char *output, size_t out_len,
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285 | const unsigned char *additional, size_t add_len )
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286 | {
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287 | int ret;
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288 | mbedtls_hmac_drbg_context *ctx = (mbedtls_hmac_drbg_context *) p_rng;
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289 | size_t md_len = mbedtls_md_get_size( ctx->md_ctx.md_info );
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290 | size_t left = out_len;
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291 | unsigned char *out = output;
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292 |
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293 | /* II. Check request length */
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294 | if( out_len > MBEDTLS_HMAC_DRBG_MAX_REQUEST )
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295 | return( MBEDTLS_ERR_HMAC_DRBG_REQUEST_TOO_BIG );
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296 |
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297 | /* III. Check input length */
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298 | if( add_len > MBEDTLS_HMAC_DRBG_MAX_INPUT )
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299 | return( MBEDTLS_ERR_HMAC_DRBG_INPUT_TOO_BIG );
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300 |
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301 | /* 1. (aka VII and IX) Check reseed counter and PR */
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302 | if( ctx->f_entropy != NULL && /* For no-reseeding instances */
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303 | ( ctx->prediction_resistance == MBEDTLS_HMAC_DRBG_PR_ON ||
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304 | ctx->reseed_counter > ctx->reseed_interval ) )
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305 | {
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306 | if( ( ret = mbedtls_hmac_drbg_reseed( ctx, additional, add_len ) ) != 0 )
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307 | return( ret );
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308 |
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309 | add_len = 0; /* VII.4 */
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310 | }
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311 |
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312 | /* 2. Use additional data if any */
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313 | if( additional != NULL && add_len != 0 )
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314 | {
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315 | if( ( ret = mbedtls_hmac_drbg_update_ret( ctx,
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316 | additional, add_len ) ) != 0 )
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317 | goto exit;
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318 | }
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319 |
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320 | /* 3, 4, 5. Generate bytes */
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321 | while( left != 0 )
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322 | {
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323 | size_t use_len = left > md_len ? md_len : left;
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324 |
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325 | if( ( ret = mbedtls_md_hmac_reset( &ctx->md_ctx ) ) != 0 )
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326 | goto exit;
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327 | if( ( ret = mbedtls_md_hmac_update( &ctx->md_ctx,
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328 | ctx->V, md_len ) ) != 0 )
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329 | goto exit;
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330 | if( ( ret = mbedtls_md_hmac_finish( &ctx->md_ctx, ctx->V ) ) != 0 )
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331 | goto exit;
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332 |
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333 | memcpy( out, ctx->V, use_len );
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334 | out += use_len;
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335 | left -= use_len;
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336 | }
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337 |
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338 | /* 6. Update */
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339 | if( ( ret = mbedtls_hmac_drbg_update_ret( ctx,
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340 | additional, add_len ) ) != 0 )
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341 | goto exit;
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342 |
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343 | /* 7. Update reseed counter */
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344 | ctx->reseed_counter++;
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345 |
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346 | exit:
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347 | /* 8. Done */
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348 | return( ret );
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349 | }
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350 |
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351 | /*
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352 | * HMAC_DRBG random function
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353 | */
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354 | int mbedtls_hmac_drbg_random( void *p_rng, unsigned char *output, size_t out_len )
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355 | {
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356 | int ret;
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357 | mbedtls_hmac_drbg_context *ctx = (mbedtls_hmac_drbg_context *) p_rng;
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358 |
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359 | #if defined(MBEDTLS_THREADING_C)
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360 | if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
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361 | return( ret );
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362 | #endif
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363 |
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364 | ret = mbedtls_hmac_drbg_random_with_add( ctx, output, out_len, NULL, 0 );
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365 |
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366 | #if defined(MBEDTLS_THREADING_C)
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367 | if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
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368 | return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
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369 | #endif
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370 |
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371 | return( ret );
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372 | }
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373 |
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374 | /*
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375 | * Free an HMAC_DRBG context
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376 | */
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377 | void mbedtls_hmac_drbg_free( mbedtls_hmac_drbg_context *ctx )
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378 | {
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379 | if( ctx == NULL )
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380 | return;
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381 |
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382 | #if defined(MBEDTLS_THREADING_C)
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383 | mbedtls_mutex_free( &ctx->mutex );
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384 | #endif
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385 | mbedtls_md_free( &ctx->md_ctx );
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386 | mbedtls_platform_zeroize( ctx, sizeof( mbedtls_hmac_drbg_context ) );
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387 | }
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388 |
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389 | #if defined(MBEDTLS_FS_IO)
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390 | int mbedtls_hmac_drbg_write_seed_file( mbedtls_hmac_drbg_context *ctx, const char *path )
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391 | {
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392 | int ret;
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393 | FILE *f;
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394 | unsigned char buf[ MBEDTLS_HMAC_DRBG_MAX_INPUT ];
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395 |
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396 | if( ( f = fopen( path, "wb" ) ) == NULL )
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397 | return( MBEDTLS_ERR_HMAC_DRBG_FILE_IO_ERROR );
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398 |
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399 | if( ( ret = mbedtls_hmac_drbg_random( ctx, buf, sizeof( buf ) ) ) != 0 )
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400 | goto exit;
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401 |
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402 | if( fwrite( buf, 1, sizeof( buf ), f ) != sizeof( buf ) )
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403 | {
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404 | ret = MBEDTLS_ERR_HMAC_DRBG_FILE_IO_ERROR;
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405 | goto exit;
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406 | }
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407 |
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408 | ret = 0;
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409 |
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410 | exit:
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411 | fclose( f );
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412 | mbedtls_platform_zeroize( buf, sizeof( buf ) );
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413 |
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414 | return( ret );
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415 | }
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416 |
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417 | int mbedtls_hmac_drbg_update_seed_file( mbedtls_hmac_drbg_context *ctx, const char *path )
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418 | {
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419 | int ret = 0;
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420 | FILE *f = NULL;
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421 | size_t n;
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422 | unsigned char buf[ MBEDTLS_HMAC_DRBG_MAX_INPUT ];
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423 | unsigned char c;
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424 |
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425 | if( ( f = fopen( path, "rb" ) ) == NULL )
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426 | return( MBEDTLS_ERR_HMAC_DRBG_FILE_IO_ERROR );
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427 |
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428 | n = fread( buf, 1, sizeof( buf ), f );
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429 | if( fread( &c, 1, 1, f ) != 0 )
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430 | {
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431 | ret = MBEDTLS_ERR_HMAC_DRBG_INPUT_TOO_BIG;
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432 | goto exit;
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433 | }
|
---|
434 | if( n == 0 || ferror( f ) )
|
---|
435 | {
|
---|
436 | ret = MBEDTLS_ERR_HMAC_DRBG_FILE_IO_ERROR;
|
---|
437 | goto exit;
|
---|
438 | }
|
---|
439 | fclose( f );
|
---|
440 | f = NULL;
|
---|
441 |
|
---|
442 | ret = mbedtls_hmac_drbg_update_ret( ctx, buf, n );
|
---|
443 |
|
---|
444 | exit:
|
---|
445 | mbedtls_platform_zeroize( buf, sizeof( buf ) );
|
---|
446 | if( f != NULL )
|
---|
447 | fclose( f );
|
---|
448 | if( ret != 0 )
|
---|
449 | return( ret );
|
---|
450 | return( mbedtls_hmac_drbg_write_seed_file( ctx, path ) );
|
---|
451 | }
|
---|
452 | #endif /* MBEDTLS_FS_IO */
|
---|
453 |
|
---|
454 |
|
---|
455 | #if defined(MBEDTLS_SELF_TEST)
|
---|
456 |
|
---|
457 | #if !defined(MBEDTLS_SHA1_C)
|
---|
458 | /* Dummy checkup routine */
|
---|
459 | int mbedtls_hmac_drbg_self_test( int verbose )
|
---|
460 | {
|
---|
461 | (void) verbose;
|
---|
462 | return( 0 );
|
---|
463 | }
|
---|
464 | #else
|
---|
465 |
|
---|
466 | #define OUTPUT_LEN 80
|
---|
467 |
|
---|
468 | /* From a NIST PR=true test vector */
|
---|
469 | static const unsigned char entropy_pr[] = {
|
---|
470 | 0xa0, 0xc9, 0xab, 0x58, 0xf1, 0xe2, 0xe5, 0xa4, 0xde, 0x3e, 0xbd, 0x4f,
|
---|
471 | 0xf7, 0x3e, 0x9c, 0x5b, 0x64, 0xef, 0xd8, 0xca, 0x02, 0x8c, 0xf8, 0x11,
|
---|
472 | 0x48, 0xa5, 0x84, 0xfe, 0x69, 0xab, 0x5a, 0xee, 0x42, 0xaa, 0x4d, 0x42,
|
---|
473 | 0x17, 0x60, 0x99, 0xd4, 0x5e, 0x13, 0x97, 0xdc, 0x40, 0x4d, 0x86, 0xa3,
|
---|
474 | 0x7b, 0xf5, 0x59, 0x54, 0x75, 0x69, 0x51, 0xe4 };
|
---|
475 | static const unsigned char result_pr[OUTPUT_LEN] = {
|
---|
476 | 0x9a, 0x00, 0xa2, 0xd0, 0x0e, 0xd5, 0x9b, 0xfe, 0x31, 0xec, 0xb1, 0x39,
|
---|
477 | 0x9b, 0x60, 0x81, 0x48, 0xd1, 0x96, 0x9d, 0x25, 0x0d, 0x3c, 0x1e, 0x94,
|
---|
478 | 0x10, 0x10, 0x98, 0x12, 0x93, 0x25, 0xca, 0xb8, 0xfc, 0xcc, 0x2d, 0x54,
|
---|
479 | 0x73, 0x19, 0x70, 0xc0, 0x10, 0x7a, 0xa4, 0x89, 0x25, 0x19, 0x95, 0x5e,
|
---|
480 | 0x4b, 0xc6, 0x00, 0x1d, 0x7f, 0x4e, 0x6a, 0x2b, 0xf8, 0xa3, 0x01, 0xab,
|
---|
481 | 0x46, 0x05, 0x5c, 0x09, 0xa6, 0x71, 0x88, 0xf1, 0xa7, 0x40, 0xee, 0xf3,
|
---|
482 | 0xe1, 0x5c, 0x02, 0x9b, 0x44, 0xaf, 0x03, 0x44 };
|
---|
483 |
|
---|
484 | /* From a NIST PR=false test vector */
|
---|
485 | static const unsigned char entropy_nopr[] = {
|
---|
486 | 0x79, 0x34, 0x9b, 0xbf, 0x7c, 0xdd, 0xa5, 0x79, 0x95, 0x57, 0x86, 0x66,
|
---|
487 | 0x21, 0xc9, 0x13, 0x83, 0x11, 0x46, 0x73, 0x3a, 0xbf, 0x8c, 0x35, 0xc8,
|
---|
488 | 0xc7, 0x21, 0x5b, 0x5b, 0x96, 0xc4, 0x8e, 0x9b, 0x33, 0x8c, 0x74, 0xe3,
|
---|
489 | 0xe9, 0x9d, 0xfe, 0xdf };
|
---|
490 | static const unsigned char result_nopr[OUTPUT_LEN] = {
|
---|
491 | 0xc6, 0xa1, 0x6a, 0xb8, 0xd4, 0x20, 0x70, 0x6f, 0x0f, 0x34, 0xab, 0x7f,
|
---|
492 | 0xec, 0x5a, 0xdc, 0xa9, 0xd8, 0xca, 0x3a, 0x13, 0x3e, 0x15, 0x9c, 0xa6,
|
---|
493 | 0xac, 0x43, 0xc6, 0xf8, 0xa2, 0xbe, 0x22, 0x83, 0x4a, 0x4c, 0x0a, 0x0a,
|
---|
494 | 0xff, 0xb1, 0x0d, 0x71, 0x94, 0xf1, 0xc1, 0xa5, 0xcf, 0x73, 0x22, 0xec,
|
---|
495 | 0x1a, 0xe0, 0x96, 0x4e, 0xd4, 0xbf, 0x12, 0x27, 0x46, 0xe0, 0x87, 0xfd,
|
---|
496 | 0xb5, 0xb3, 0xe9, 0x1b, 0x34, 0x93, 0xd5, 0xbb, 0x98, 0xfa, 0xed, 0x49,
|
---|
497 | 0xe8, 0x5f, 0x13, 0x0f, 0xc8, 0xa4, 0x59, 0xb7 };
|
---|
498 |
|
---|
499 | /* "Entropy" from buffer */
|
---|
500 | static size_t test_offset;
|
---|
501 | static int hmac_drbg_self_test_entropy( void *data,
|
---|
502 | unsigned char *buf, size_t len )
|
---|
503 | {
|
---|
504 | const unsigned char *p = data;
|
---|
505 | memcpy( buf, p + test_offset, len );
|
---|
506 | test_offset += len;
|
---|
507 | return( 0 );
|
---|
508 | }
|
---|
509 |
|
---|
510 | #define CHK( c ) if( (c) != 0 ) \
|
---|
511 | { \
|
---|
512 | if( verbose != 0 ) \
|
---|
513 | mbedtls_printf( "failed\n" ); \
|
---|
514 | return( 1 ); \
|
---|
515 | }
|
---|
516 |
|
---|
517 | /*
|
---|
518 | * Checkup routine for HMAC_DRBG with SHA-1
|
---|
519 | */
|
---|
520 | int mbedtls_hmac_drbg_self_test( int verbose )
|
---|
521 | {
|
---|
522 | mbedtls_hmac_drbg_context ctx;
|
---|
523 | unsigned char buf[OUTPUT_LEN];
|
---|
524 | const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type( MBEDTLS_MD_SHA1 );
|
---|
525 |
|
---|
526 | mbedtls_hmac_drbg_init( &ctx );
|
---|
527 |
|
---|
528 | /*
|
---|
529 | * PR = True
|
---|
530 | */
|
---|
531 | if( verbose != 0 )
|
---|
532 | mbedtls_printf( " HMAC_DRBG (PR = True) : " );
|
---|
533 |
|
---|
534 | test_offset = 0;
|
---|
535 | CHK( mbedtls_hmac_drbg_seed( &ctx, md_info,
|
---|
536 | hmac_drbg_self_test_entropy, (void *) entropy_pr,
|
---|
537 | NULL, 0 ) );
|
---|
538 | mbedtls_hmac_drbg_set_prediction_resistance( &ctx, MBEDTLS_HMAC_DRBG_PR_ON );
|
---|
539 | CHK( mbedtls_hmac_drbg_random( &ctx, buf, OUTPUT_LEN ) );
|
---|
540 | CHK( mbedtls_hmac_drbg_random( &ctx, buf, OUTPUT_LEN ) );
|
---|
541 | CHK( memcmp( buf, result_pr, OUTPUT_LEN ) );
|
---|
542 | mbedtls_hmac_drbg_free( &ctx );
|
---|
543 |
|
---|
544 | mbedtls_hmac_drbg_free( &ctx );
|
---|
545 |
|
---|
546 | if( verbose != 0 )
|
---|
547 | mbedtls_printf( "passed\n" );
|
---|
548 |
|
---|
549 | /*
|
---|
550 | * PR = False
|
---|
551 | */
|
---|
552 | if( verbose != 0 )
|
---|
553 | mbedtls_printf( " HMAC_DRBG (PR = False) : " );
|
---|
554 |
|
---|
555 | mbedtls_hmac_drbg_init( &ctx );
|
---|
556 |
|
---|
557 | test_offset = 0;
|
---|
558 | CHK( mbedtls_hmac_drbg_seed( &ctx, md_info,
|
---|
559 | hmac_drbg_self_test_entropy, (void *) entropy_nopr,
|
---|
560 | NULL, 0 ) );
|
---|
561 | CHK( mbedtls_hmac_drbg_reseed( &ctx, NULL, 0 ) );
|
---|
562 | CHK( mbedtls_hmac_drbg_random( &ctx, buf, OUTPUT_LEN ) );
|
---|
563 | CHK( mbedtls_hmac_drbg_random( &ctx, buf, OUTPUT_LEN ) );
|
---|
564 | CHK( memcmp( buf, result_nopr, OUTPUT_LEN ) );
|
---|
565 | mbedtls_hmac_drbg_free( &ctx );
|
---|
566 |
|
---|
567 | mbedtls_hmac_drbg_free( &ctx );
|
---|
568 |
|
---|
569 | if( verbose != 0 )
|
---|
570 | mbedtls_printf( "passed\n" );
|
---|
571 |
|
---|
572 | if( verbose != 0 )
|
---|
573 | mbedtls_printf( "\n" );
|
---|
574 |
|
---|
575 | return( 0 );
|
---|
576 | }
|
---|
577 | #endif /* MBEDTLS_SHA1_C */
|
---|
578 | #endif /* MBEDTLS_SELF_TEST */
|
---|
579 |
|
---|
580 | #endif /* MBEDTLS_HMAC_DRBG_C */
|
---|