[398] | 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 );
|
---|
| 412 | mbedtls_platform_zeroize( buf, sizeof( buf ) );
|
---|
| 413 |
|
---|
| 414 | return( ret );
|
---|
| 415 | }
|
---|
| 416 |
|
---|
| 417 | int mbedtls_hmac_drbg_update_seed_file( mbedtls_hmac_drbg_context *ctx, const char *path )
|
---|
| 418 | {
|
---|
| 419 | int ret = 0;
|
---|
| 420 | FILE *f = NULL;
|
---|
| 421 | size_t n;
|
---|
| 422 | unsigned char buf[ MBEDTLS_HMAC_DRBG_MAX_INPUT ];
|
---|
| 423 | unsigned char c;
|
---|
| 424 |
|
---|
| 425 | if( ( f = fopen( path, "rb" ) ) == NULL )
|
---|
| 426 | return( MBEDTLS_ERR_HMAC_DRBG_FILE_IO_ERROR );
|
---|
| 427 |
|
---|
| 428 | n = fread( buf, 1, sizeof( buf ), f );
|
---|
| 429 | if( fread( &c, 1, 1, f ) != 0 )
|
---|
| 430 | {
|
---|
| 431 | ret = MBEDTLS_ERR_HMAC_DRBG_INPUT_TOO_BIG;
|
---|
| 432 | goto exit;
|
---|
| 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 */
|
---|