Hannes Tschofenig
Example program to test AES-GCM functionality. Used for a workshop
SSL/library/cipher.c@0:796d0f61a05b, 2018-09-27 (annotated)
- Committer:
- HannesTschofenig
- Date:
- Thu Sep 27 06:34:22 2018 +0000
- Revision:
- 0:796d0f61a05b
Example AES-GCM test program
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| HannesTschofenig | 0:796d0f61a05b | 1 | /** |
| HannesTschofenig | 0:796d0f61a05b | 2 | * \file cipher.c |
| HannesTschofenig | 0:796d0f61a05b | 3 | * |
| HannesTschofenig | 0:796d0f61a05b | 4 | * \brief Generic cipher wrapper for PolarSSL |
| HannesTschofenig | 0:796d0f61a05b | 5 | * |
| HannesTschofenig | 0:796d0f61a05b | 6 | * \author Adriaan de Jong <dejong@fox-it.com> |
| HannesTschofenig | 0:796d0f61a05b | 7 | * |
| HannesTschofenig | 0:796d0f61a05b | 8 | * Copyright (C) 2006-2014, Brainspark B.V. |
| HannesTschofenig | 0:796d0f61a05b | 9 | * |
| HannesTschofenig | 0:796d0f61a05b | 10 | * This file is part of PolarSSL (http://www.polarssl.org) |
| HannesTschofenig | 0:796d0f61a05b | 11 | * Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org> |
| HannesTschofenig | 0:796d0f61a05b | 12 | * |
| HannesTschofenig | 0:796d0f61a05b | 13 | * All rights reserved. |
| HannesTschofenig | 0:796d0f61a05b | 14 | * |
| HannesTschofenig | 0:796d0f61a05b | 15 | * This program is free software; you can redistribute it and/or modify |
| HannesTschofenig | 0:796d0f61a05b | 16 | * it under the terms of the GNU General Public License as published by |
| HannesTschofenig | 0:796d0f61a05b | 17 | * the Free Software Foundation; either version 2 of the License, or |
| HannesTschofenig | 0:796d0f61a05b | 18 | * (at your option) any later version. |
| HannesTschofenig | 0:796d0f61a05b | 19 | * |
| HannesTschofenig | 0:796d0f61a05b | 20 | * This program is distributed in the hope that it will be useful, |
| HannesTschofenig | 0:796d0f61a05b | 21 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| HannesTschofenig | 0:796d0f61a05b | 22 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| HannesTschofenig | 0:796d0f61a05b | 23 | * GNU General Public License for more details. |
| HannesTschofenig | 0:796d0f61a05b | 24 | * |
| HannesTschofenig | 0:796d0f61a05b | 25 | * You should have received a copy of the GNU General Public License along |
| HannesTschofenig | 0:796d0f61a05b | 26 | * with this program; if not, write to the Free Software Foundation, Inc., |
| HannesTschofenig | 0:796d0f61a05b | 27 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| HannesTschofenig | 0:796d0f61a05b | 28 | */ |
| HannesTschofenig | 0:796d0f61a05b | 29 | |
| HannesTschofenig | 0:796d0f61a05b | 30 | #if !defined(POLARSSL_CONFIG_FILE) |
| HannesTschofenig | 0:796d0f61a05b | 31 | #include "polarssl/config.h" |
| HannesTschofenig | 0:796d0f61a05b | 32 | #else |
| HannesTschofenig | 0:796d0f61a05b | 33 | #include POLARSSL_CONFIG_FILE |
| HannesTschofenig | 0:796d0f61a05b | 34 | #endif |
| HannesTschofenig | 0:796d0f61a05b | 35 | |
| HannesTschofenig | 0:796d0f61a05b | 36 | #if defined(POLARSSL_CIPHER_C) |
| HannesTschofenig | 0:796d0f61a05b | 37 | |
| HannesTschofenig | 0:796d0f61a05b | 38 | #include "polarssl/cipher.h" |
| HannesTschofenig | 0:796d0f61a05b | 39 | #include "polarssl/cipher_wrap.h" |
| HannesTschofenig | 0:796d0f61a05b | 40 | |
| HannesTschofenig | 0:796d0f61a05b | 41 | #if defined(POLARSSL_GCM_C) |
| HannesTschofenig | 0:796d0f61a05b | 42 | #include "polarssl/gcm.h" |
| HannesTschofenig | 0:796d0f61a05b | 43 | #endif |
| HannesTschofenig | 0:796d0f61a05b | 44 | |
| HannesTschofenig | 0:796d0f61a05b | 45 | #include <stdlib.h> |
| HannesTschofenig | 0:796d0f61a05b | 46 | |
| HannesTschofenig | 0:796d0f61a05b | 47 | #if defined(POLARSSL_ARC4_C) || defined(POLARSSL_CIPHER_NULL_CIPHER) |
| HannesTschofenig | 0:796d0f61a05b | 48 | #define POLARSSL_CIPHER_MODE_STREAM |
| HannesTschofenig | 0:796d0f61a05b | 49 | #endif |
| HannesTschofenig | 0:796d0f61a05b | 50 | |
| HannesTschofenig | 0:796d0f61a05b | 51 | #if defined(_MSC_VER) && !defined strcasecmp && !defined(EFIX64) && \ |
| HannesTschofenig | 0:796d0f61a05b | 52 | !defined(EFI32) |
| HannesTschofenig | 0:796d0f61a05b | 53 | #define strcasecmp _stricmp |
| HannesTschofenig | 0:796d0f61a05b | 54 | #endif |
| HannesTschofenig | 0:796d0f61a05b | 55 | |
| HannesTschofenig | 0:796d0f61a05b | 56 | static int supported_init = 0; |
| HannesTschofenig | 0:796d0f61a05b | 57 | |
| HannesTschofenig | 0:796d0f61a05b | 58 | const int *cipher_list( void ) |
| HannesTschofenig | 0:796d0f61a05b | 59 | { |
| HannesTschofenig | 0:796d0f61a05b | 60 | const cipher_definition_t *def; |
| HannesTschofenig | 0:796d0f61a05b | 61 | int *type; |
| HannesTschofenig | 0:796d0f61a05b | 62 | |
| HannesTschofenig | 0:796d0f61a05b | 63 | if( ! supported_init ) |
| HannesTschofenig | 0:796d0f61a05b | 64 | { |
| HannesTschofenig | 0:796d0f61a05b | 65 | def = cipher_definitions; |
| HannesTschofenig | 0:796d0f61a05b | 66 | type = supported_ciphers; |
| HannesTschofenig | 0:796d0f61a05b | 67 | |
| HannesTschofenig | 0:796d0f61a05b | 68 | while( def->type != 0 ) |
| HannesTschofenig | 0:796d0f61a05b | 69 | *type++ = (*def++).type; |
| HannesTschofenig | 0:796d0f61a05b | 70 | |
| HannesTschofenig | 0:796d0f61a05b | 71 | *type = 0; |
| HannesTschofenig | 0:796d0f61a05b | 72 | |
| HannesTschofenig | 0:796d0f61a05b | 73 | supported_init = 1; |
| HannesTschofenig | 0:796d0f61a05b | 74 | } |
| HannesTschofenig | 0:796d0f61a05b | 75 | |
| HannesTschofenig | 0:796d0f61a05b | 76 | return supported_ciphers; |
| HannesTschofenig | 0:796d0f61a05b | 77 | } |
| HannesTschofenig | 0:796d0f61a05b | 78 | |
| HannesTschofenig | 0:796d0f61a05b | 79 | const cipher_info_t *cipher_info_from_type( const cipher_type_t cipher_type ) |
| HannesTschofenig | 0:796d0f61a05b | 80 | { |
| HannesTschofenig | 0:796d0f61a05b | 81 | const cipher_definition_t *def; |
| HannesTschofenig | 0:796d0f61a05b | 82 | |
| HannesTschofenig | 0:796d0f61a05b | 83 | for( def = cipher_definitions; def->info != NULL; def++ ) |
| HannesTschofenig | 0:796d0f61a05b | 84 | if( def->type == cipher_type ) |
| HannesTschofenig | 0:796d0f61a05b | 85 | return( def->info ); |
| HannesTschofenig | 0:796d0f61a05b | 86 | |
| HannesTschofenig | 0:796d0f61a05b | 87 | return NULL; |
| HannesTschofenig | 0:796d0f61a05b | 88 | } |
| HannesTschofenig | 0:796d0f61a05b | 89 | |
| HannesTschofenig | 0:796d0f61a05b | 90 | const cipher_info_t *cipher_info_from_string( const char *cipher_name ) |
| HannesTschofenig | 0:796d0f61a05b | 91 | { |
| HannesTschofenig | 0:796d0f61a05b | 92 | const cipher_definition_t *def; |
| HannesTschofenig | 0:796d0f61a05b | 93 | |
| HannesTschofenig | 0:796d0f61a05b | 94 | if( NULL == cipher_name ) |
| HannesTschofenig | 0:796d0f61a05b | 95 | return NULL; |
| HannesTschofenig | 0:796d0f61a05b | 96 | |
| HannesTschofenig | 0:796d0f61a05b | 97 | for( def = cipher_definitions; def->info != NULL; def++ ) |
| HannesTschofenig | 0:796d0f61a05b | 98 | if( ! strcasecmp( def->info->name, cipher_name ) ) |
| HannesTschofenig | 0:796d0f61a05b | 99 | return( def->info ); |
| HannesTschofenig | 0:796d0f61a05b | 100 | |
| HannesTschofenig | 0:796d0f61a05b | 101 | return NULL; |
| HannesTschofenig | 0:796d0f61a05b | 102 | } |
| HannesTschofenig | 0:796d0f61a05b | 103 | |
| HannesTschofenig | 0:796d0f61a05b | 104 | const cipher_info_t *cipher_info_from_values( const cipher_id_t cipher_id, |
| HannesTschofenig | 0:796d0f61a05b | 105 | int key_length, |
| HannesTschofenig | 0:796d0f61a05b | 106 | const cipher_mode_t mode ) |
| HannesTschofenig | 0:796d0f61a05b | 107 | { |
| HannesTschofenig | 0:796d0f61a05b | 108 | const cipher_definition_t *def; |
| HannesTschofenig | 0:796d0f61a05b | 109 | |
| HannesTschofenig | 0:796d0f61a05b | 110 | for( def = cipher_definitions; def->info != NULL; def++ ) |
| HannesTschofenig | 0:796d0f61a05b | 111 | if( def->info->base->cipher == cipher_id && |
| HannesTschofenig | 0:796d0f61a05b | 112 | def->info->key_length == (unsigned) key_length && |
| HannesTschofenig | 0:796d0f61a05b | 113 | def->info->mode == mode ) |
| HannesTschofenig | 0:796d0f61a05b | 114 | return( def->info ); |
| HannesTschofenig | 0:796d0f61a05b | 115 | |
| HannesTschofenig | 0:796d0f61a05b | 116 | return NULL; |
| HannesTschofenig | 0:796d0f61a05b | 117 | } |
| HannesTschofenig | 0:796d0f61a05b | 118 | |
| HannesTschofenig | 0:796d0f61a05b | 119 | int cipher_init_ctx( cipher_context_t *ctx, const cipher_info_t *cipher_info ) |
| HannesTschofenig | 0:796d0f61a05b | 120 | { |
| HannesTschofenig | 0:796d0f61a05b | 121 | if( NULL == cipher_info || NULL == ctx ) |
| HannesTschofenig | 0:796d0f61a05b | 122 | return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA; |
| HannesTschofenig | 0:796d0f61a05b | 123 | |
| HannesTschofenig | 0:796d0f61a05b | 124 | memset( ctx, 0, sizeof( cipher_context_t ) ); |
| HannesTschofenig | 0:796d0f61a05b | 125 | |
| HannesTschofenig | 0:796d0f61a05b | 126 | if( NULL == ( ctx->cipher_ctx = cipher_info->base->ctx_alloc_func() ) ) |
| HannesTschofenig | 0:796d0f61a05b | 127 | return POLARSSL_ERR_CIPHER_ALLOC_FAILED; |
| HannesTschofenig | 0:796d0f61a05b | 128 | |
| HannesTschofenig | 0:796d0f61a05b | 129 | ctx->cipher_info = cipher_info; |
| HannesTschofenig | 0:796d0f61a05b | 130 | |
| HannesTschofenig | 0:796d0f61a05b | 131 | #if defined(POLARSSL_CIPHER_MODE_WITH_PADDING) |
| HannesTschofenig | 0:796d0f61a05b | 132 | /* |
| HannesTschofenig | 0:796d0f61a05b | 133 | * Ignore possible errors caused by a cipher mode that doesn't use padding |
| HannesTschofenig | 0:796d0f61a05b | 134 | */ |
| HannesTschofenig | 0:796d0f61a05b | 135 | #if defined(POLARSSL_CIPHER_PADDING_PKCS7) |
| HannesTschofenig | 0:796d0f61a05b | 136 | (void) cipher_set_padding_mode( ctx, POLARSSL_PADDING_PKCS7 ); |
| HannesTschofenig | 0:796d0f61a05b | 137 | #else |
| HannesTschofenig | 0:796d0f61a05b | 138 | (void) cipher_set_padding_mode( ctx, POLARSSL_PADDING_NONE ); |
| HannesTschofenig | 0:796d0f61a05b | 139 | #endif |
| HannesTschofenig | 0:796d0f61a05b | 140 | #endif /* POLARSSL_CIPHER_MODE_WITH_PADDING */ |
| HannesTschofenig | 0:796d0f61a05b | 141 | |
| HannesTschofenig | 0:796d0f61a05b | 142 | return 0; |
| HannesTschofenig | 0:796d0f61a05b | 143 | } |
| HannesTschofenig | 0:796d0f61a05b | 144 | |
| HannesTschofenig | 0:796d0f61a05b | 145 | int cipher_free_ctx( cipher_context_t *ctx ) |
| HannesTschofenig | 0:796d0f61a05b | 146 | { |
| HannesTschofenig | 0:796d0f61a05b | 147 | if( ctx == NULL || ctx->cipher_info == NULL ) |
| HannesTschofenig | 0:796d0f61a05b | 148 | return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA; |
| HannesTschofenig | 0:796d0f61a05b | 149 | |
| HannesTschofenig | 0:796d0f61a05b | 150 | ctx->cipher_info->base->ctx_free_func( ctx->cipher_ctx ); |
| HannesTschofenig | 0:796d0f61a05b | 151 | |
| HannesTschofenig | 0:796d0f61a05b | 152 | return 0; |
| HannesTschofenig | 0:796d0f61a05b | 153 | } |
| HannesTschofenig | 0:796d0f61a05b | 154 | |
| HannesTschofenig | 0:796d0f61a05b | 155 | int cipher_setkey( cipher_context_t *ctx, const unsigned char *key, |
| HannesTschofenig | 0:796d0f61a05b | 156 | int key_length, const operation_t operation ) |
| HannesTschofenig | 0:796d0f61a05b | 157 | { |
| HannesTschofenig | 0:796d0f61a05b | 158 | if( NULL == ctx || NULL == ctx->cipher_info ) |
| HannesTschofenig | 0:796d0f61a05b | 159 | return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA; |
| HannesTschofenig | 0:796d0f61a05b | 160 | |
| HannesTschofenig | 0:796d0f61a05b | 161 | if( (int) ctx->cipher_info->key_length != key_length ) |
| HannesTschofenig | 0:796d0f61a05b | 162 | return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA; |
| HannesTschofenig | 0:796d0f61a05b | 163 | |
| HannesTschofenig | 0:796d0f61a05b | 164 | ctx->key_length = key_length; |
| HannesTschofenig | 0:796d0f61a05b | 165 | ctx->operation = operation; |
| HannesTschofenig | 0:796d0f61a05b | 166 | |
| HannesTschofenig | 0:796d0f61a05b | 167 | /* |
| HannesTschofenig | 0:796d0f61a05b | 168 | * For CFB and CTR mode always use the encryption key schedule |
| HannesTschofenig | 0:796d0f61a05b | 169 | */ |
| HannesTschofenig | 0:796d0f61a05b | 170 | if( POLARSSL_ENCRYPT == operation || |
| HannesTschofenig | 0:796d0f61a05b | 171 | POLARSSL_MODE_CFB == ctx->cipher_info->mode || |
| HannesTschofenig | 0:796d0f61a05b | 172 | POLARSSL_MODE_CTR == ctx->cipher_info->mode ) |
| HannesTschofenig | 0:796d0f61a05b | 173 | { |
| HannesTschofenig | 0:796d0f61a05b | 174 | return ctx->cipher_info->base->setkey_enc_func( ctx->cipher_ctx, key, |
| HannesTschofenig | 0:796d0f61a05b | 175 | ctx->key_length ); |
| HannesTschofenig | 0:796d0f61a05b | 176 | } |
| HannesTschofenig | 0:796d0f61a05b | 177 | |
| HannesTschofenig | 0:796d0f61a05b | 178 | if( POLARSSL_DECRYPT == operation ) |
| HannesTschofenig | 0:796d0f61a05b | 179 | return ctx->cipher_info->base->setkey_dec_func( ctx->cipher_ctx, key, |
| HannesTschofenig | 0:796d0f61a05b | 180 | ctx->key_length ); |
| HannesTschofenig | 0:796d0f61a05b | 181 | |
| HannesTschofenig | 0:796d0f61a05b | 182 | return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA; |
| HannesTschofenig | 0:796d0f61a05b | 183 | } |
| HannesTschofenig | 0:796d0f61a05b | 184 | |
| HannesTschofenig | 0:796d0f61a05b | 185 | int cipher_set_iv( cipher_context_t *ctx, |
| HannesTschofenig | 0:796d0f61a05b | 186 | const unsigned char *iv, size_t iv_len ) |
| HannesTschofenig | 0:796d0f61a05b | 187 | { |
| HannesTschofenig | 0:796d0f61a05b | 188 | size_t actual_iv_size; |
| HannesTschofenig | 0:796d0f61a05b | 189 | |
| HannesTschofenig | 0:796d0f61a05b | 190 | if( NULL == ctx || NULL == ctx->cipher_info || NULL == iv ) |
| HannesTschofenig | 0:796d0f61a05b | 191 | return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA; |
| HannesTschofenig | 0:796d0f61a05b | 192 | |
| HannesTschofenig | 0:796d0f61a05b | 193 | /* avoid buffer overflow in ctx->iv */ |
| HannesTschofenig | 0:796d0f61a05b | 194 | if( iv_len > POLARSSL_MAX_IV_LENGTH ) |
| HannesTschofenig | 0:796d0f61a05b | 195 | return POLARSSL_ERR_CIPHER_FEATURE_UNAVAILABLE; |
| HannesTschofenig | 0:796d0f61a05b | 196 | |
| HannesTschofenig | 0:796d0f61a05b | 197 | if( ctx->cipher_info->accepts_variable_iv_size ) |
| HannesTschofenig | 0:796d0f61a05b | 198 | actual_iv_size = iv_len; |
| HannesTschofenig | 0:796d0f61a05b | 199 | else |
| HannesTschofenig | 0:796d0f61a05b | 200 | { |
| HannesTschofenig | 0:796d0f61a05b | 201 | actual_iv_size = ctx->cipher_info->iv_size; |
| HannesTschofenig | 0:796d0f61a05b | 202 | |
| HannesTschofenig | 0:796d0f61a05b | 203 | /* avoid reading past the end of input buffer */ |
| HannesTschofenig | 0:796d0f61a05b | 204 | if( actual_iv_size > iv_len ) |
| HannesTschofenig | 0:796d0f61a05b | 205 | return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA; |
| HannesTschofenig | 0:796d0f61a05b | 206 | } |
| HannesTschofenig | 0:796d0f61a05b | 207 | |
| HannesTschofenig | 0:796d0f61a05b | 208 | memcpy( ctx->iv, iv, actual_iv_size ); |
| HannesTschofenig | 0:796d0f61a05b | 209 | ctx->iv_size = actual_iv_size; |
| HannesTschofenig | 0:796d0f61a05b | 210 | |
| HannesTschofenig | 0:796d0f61a05b | 211 | return 0; |
| HannesTschofenig | 0:796d0f61a05b | 212 | } |
| HannesTschofenig | 0:796d0f61a05b | 213 | |
| HannesTschofenig | 0:796d0f61a05b | 214 | int cipher_reset( cipher_context_t *ctx ) |
| HannesTschofenig | 0:796d0f61a05b | 215 | { |
| HannesTschofenig | 0:796d0f61a05b | 216 | if( NULL == ctx || NULL == ctx->cipher_info ) |
| HannesTschofenig | 0:796d0f61a05b | 217 | return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA; |
| HannesTschofenig | 0:796d0f61a05b | 218 | |
| HannesTschofenig | 0:796d0f61a05b | 219 | ctx->unprocessed_len = 0; |
| HannesTschofenig | 0:796d0f61a05b | 220 | |
| HannesTschofenig | 0:796d0f61a05b | 221 | return 0; |
| HannesTschofenig | 0:796d0f61a05b | 222 | } |
| HannesTschofenig | 0:796d0f61a05b | 223 | |
| HannesTschofenig | 0:796d0f61a05b | 224 | #if defined(POLARSSL_CIPHER_MODE_AEAD) |
| HannesTschofenig | 0:796d0f61a05b | 225 | int cipher_update_ad( cipher_context_t *ctx, |
| HannesTschofenig | 0:796d0f61a05b | 226 | const unsigned char *ad, size_t ad_len ) |
| HannesTschofenig | 0:796d0f61a05b | 227 | { |
| HannesTschofenig | 0:796d0f61a05b | 228 | if( NULL == ctx || NULL == ctx->cipher_info ) |
| HannesTschofenig | 0:796d0f61a05b | 229 | return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA; |
| HannesTschofenig | 0:796d0f61a05b | 230 | |
| HannesTschofenig | 0:796d0f61a05b | 231 | #if defined(POLARSSL_GCM_C) |
| HannesTschofenig | 0:796d0f61a05b | 232 | if( POLARSSL_MODE_GCM == ctx->cipher_info->mode ) |
| HannesTschofenig | 0:796d0f61a05b | 233 | { |
| HannesTschofenig | 0:796d0f61a05b | 234 | return gcm_starts( (gcm_context *) ctx->cipher_ctx, ctx->operation, |
| HannesTschofenig | 0:796d0f61a05b | 235 | ctx->iv, ctx->iv_size, ad, ad_len ); |
| HannesTschofenig | 0:796d0f61a05b | 236 | } |
| HannesTschofenig | 0:796d0f61a05b | 237 | #endif |
| HannesTschofenig | 0:796d0f61a05b | 238 | |
| HannesTschofenig | 0:796d0f61a05b | 239 | return 0; |
| HannesTschofenig | 0:796d0f61a05b | 240 | } |
| HannesTschofenig | 0:796d0f61a05b | 241 | #endif /* POLARSSL_CIPHER_MODE_AEAD */ |
| HannesTschofenig | 0:796d0f61a05b | 242 | |
| HannesTschofenig | 0:796d0f61a05b | 243 | int cipher_update( cipher_context_t *ctx, const unsigned char *input, |
| HannesTschofenig | 0:796d0f61a05b | 244 | size_t ilen, unsigned char *output, size_t *olen ) |
| HannesTschofenig | 0:796d0f61a05b | 245 | { |
| HannesTschofenig | 0:796d0f61a05b | 246 | int ret; |
| HannesTschofenig | 0:796d0f61a05b | 247 | |
| HannesTschofenig | 0:796d0f61a05b | 248 | if( NULL == ctx || NULL == ctx->cipher_info || NULL == olen ) |
| HannesTschofenig | 0:796d0f61a05b | 249 | { |
| HannesTschofenig | 0:796d0f61a05b | 250 | return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA; |
| HannesTschofenig | 0:796d0f61a05b | 251 | } |
| HannesTschofenig | 0:796d0f61a05b | 252 | |
| HannesTschofenig | 0:796d0f61a05b | 253 | *olen = 0; |
| HannesTschofenig | 0:796d0f61a05b | 254 | |
| HannesTschofenig | 0:796d0f61a05b | 255 | if( ctx->cipher_info->mode == POLARSSL_MODE_ECB ) |
| HannesTschofenig | 0:796d0f61a05b | 256 | { |
| HannesTschofenig | 0:796d0f61a05b | 257 | if( ilen != cipher_get_block_size( ctx ) ) |
| HannesTschofenig | 0:796d0f61a05b | 258 | return POLARSSL_ERR_CIPHER_FULL_BLOCK_EXPECTED; |
| HannesTschofenig | 0:796d0f61a05b | 259 | |
| HannesTschofenig | 0:796d0f61a05b | 260 | *olen = ilen; |
| HannesTschofenig | 0:796d0f61a05b | 261 | |
| HannesTschofenig | 0:796d0f61a05b | 262 | if( 0 != ( ret = ctx->cipher_info->base->ecb_func( ctx->cipher_ctx, |
| HannesTschofenig | 0:796d0f61a05b | 263 | ctx->operation, input, output ) ) ) |
| HannesTschofenig | 0:796d0f61a05b | 264 | { |
| HannesTschofenig | 0:796d0f61a05b | 265 | return ret; |
| HannesTschofenig | 0:796d0f61a05b | 266 | } |
| HannesTschofenig | 0:796d0f61a05b | 267 | |
| HannesTschofenig | 0:796d0f61a05b | 268 | return 0; |
| HannesTschofenig | 0:796d0f61a05b | 269 | } |
| HannesTschofenig | 0:796d0f61a05b | 270 | |
| HannesTschofenig | 0:796d0f61a05b | 271 | #if defined(POLARSSL_GCM_C) |
| HannesTschofenig | 0:796d0f61a05b | 272 | if( ctx->cipher_info->mode == POLARSSL_MODE_GCM ) |
| HannesTschofenig | 0:796d0f61a05b | 273 | { |
| HannesTschofenig | 0:796d0f61a05b | 274 | *olen = ilen; |
| HannesTschofenig | 0:796d0f61a05b | 275 | return gcm_update( (gcm_context *) ctx->cipher_ctx, ilen, input, |
| HannesTschofenig | 0:796d0f61a05b | 276 | output ); |
| HannesTschofenig | 0:796d0f61a05b | 277 | } |
| HannesTschofenig | 0:796d0f61a05b | 278 | #endif |
| HannesTschofenig | 0:796d0f61a05b | 279 | |
| HannesTschofenig | 0:796d0f61a05b | 280 | if( input == output && |
| HannesTschofenig | 0:796d0f61a05b | 281 | ( ctx->unprocessed_len != 0 || ilen % cipher_get_block_size( ctx ) ) ) |
| HannesTschofenig | 0:796d0f61a05b | 282 | { |
| HannesTschofenig | 0:796d0f61a05b | 283 | return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA; |
| HannesTschofenig | 0:796d0f61a05b | 284 | } |
| HannesTschofenig | 0:796d0f61a05b | 285 | |
| HannesTschofenig | 0:796d0f61a05b | 286 | #if defined(POLARSSL_CIPHER_MODE_CBC) |
| HannesTschofenig | 0:796d0f61a05b | 287 | if( ctx->cipher_info->mode == POLARSSL_MODE_CBC ) |
| HannesTschofenig | 0:796d0f61a05b | 288 | { |
| HannesTschofenig | 0:796d0f61a05b | 289 | size_t copy_len = 0; |
| HannesTschofenig | 0:796d0f61a05b | 290 | |
| HannesTschofenig | 0:796d0f61a05b | 291 | /* |
| HannesTschofenig | 0:796d0f61a05b | 292 | * If there is not enough data for a full block, cache it. |
| HannesTschofenig | 0:796d0f61a05b | 293 | */ |
| HannesTschofenig | 0:796d0f61a05b | 294 | if( ( ctx->operation == POLARSSL_DECRYPT && |
| HannesTschofenig | 0:796d0f61a05b | 295 | ilen + ctx->unprocessed_len <= cipher_get_block_size( ctx ) ) || |
| HannesTschofenig | 0:796d0f61a05b | 296 | ( ctx->operation == POLARSSL_ENCRYPT && |
| HannesTschofenig | 0:796d0f61a05b | 297 | ilen + ctx->unprocessed_len < cipher_get_block_size( ctx ) ) ) |
| HannesTschofenig | 0:796d0f61a05b | 298 | { |
| HannesTschofenig | 0:796d0f61a05b | 299 | memcpy( &( ctx->unprocessed_data[ctx->unprocessed_len] ), input, |
| HannesTschofenig | 0:796d0f61a05b | 300 | ilen ); |
| HannesTschofenig | 0:796d0f61a05b | 301 | |
| HannesTschofenig | 0:796d0f61a05b | 302 | ctx->unprocessed_len += ilen; |
| HannesTschofenig | 0:796d0f61a05b | 303 | return 0; |
| HannesTschofenig | 0:796d0f61a05b | 304 | } |
| HannesTschofenig | 0:796d0f61a05b | 305 | |
| HannesTschofenig | 0:796d0f61a05b | 306 | /* |
| HannesTschofenig | 0:796d0f61a05b | 307 | * Process cached data first |
| HannesTschofenig | 0:796d0f61a05b | 308 | */ |
| HannesTschofenig | 0:796d0f61a05b | 309 | if( ctx->unprocessed_len != 0 ) |
| HannesTschofenig | 0:796d0f61a05b | 310 | { |
| HannesTschofenig | 0:796d0f61a05b | 311 | copy_len = cipher_get_block_size( ctx ) - ctx->unprocessed_len; |
| HannesTschofenig | 0:796d0f61a05b | 312 | |
| HannesTschofenig | 0:796d0f61a05b | 313 | memcpy( &( ctx->unprocessed_data[ctx->unprocessed_len] ), input, |
| HannesTschofenig | 0:796d0f61a05b | 314 | copy_len ); |
| HannesTschofenig | 0:796d0f61a05b | 315 | |
| HannesTschofenig | 0:796d0f61a05b | 316 | if( 0 != ( ret = ctx->cipher_info->base->cbc_func( ctx->cipher_ctx, |
| HannesTschofenig | 0:796d0f61a05b | 317 | ctx->operation, cipher_get_block_size( ctx ), ctx->iv, |
| HannesTschofenig | 0:796d0f61a05b | 318 | ctx->unprocessed_data, output ) ) ) |
| HannesTschofenig | 0:796d0f61a05b | 319 | { |
| HannesTschofenig | 0:796d0f61a05b | 320 | return ret; |
| HannesTschofenig | 0:796d0f61a05b | 321 | } |
| HannesTschofenig | 0:796d0f61a05b | 322 | |
| HannesTschofenig | 0:796d0f61a05b | 323 | *olen += cipher_get_block_size( ctx ); |
| HannesTschofenig | 0:796d0f61a05b | 324 | output += cipher_get_block_size( ctx ); |
| HannesTschofenig | 0:796d0f61a05b | 325 | ctx->unprocessed_len = 0; |
| HannesTschofenig | 0:796d0f61a05b | 326 | |
| HannesTschofenig | 0:796d0f61a05b | 327 | input += copy_len; |
| HannesTschofenig | 0:796d0f61a05b | 328 | ilen -= copy_len; |
| HannesTschofenig | 0:796d0f61a05b | 329 | } |
| HannesTschofenig | 0:796d0f61a05b | 330 | |
| HannesTschofenig | 0:796d0f61a05b | 331 | /* |
| HannesTschofenig | 0:796d0f61a05b | 332 | * Cache final, incomplete block |
| HannesTschofenig | 0:796d0f61a05b | 333 | */ |
| HannesTschofenig | 0:796d0f61a05b | 334 | if( 0 != ilen ) |
| HannesTschofenig | 0:796d0f61a05b | 335 | { |
| HannesTschofenig | 0:796d0f61a05b | 336 | copy_len = ilen % cipher_get_block_size( ctx ); |
| HannesTschofenig | 0:796d0f61a05b | 337 | if( copy_len == 0 && ctx->operation == POLARSSL_DECRYPT ) |
| HannesTschofenig | 0:796d0f61a05b | 338 | copy_len = cipher_get_block_size(ctx); |
| HannesTschofenig | 0:796d0f61a05b | 339 | |
| HannesTschofenig | 0:796d0f61a05b | 340 | memcpy( ctx->unprocessed_data, &( input[ilen - copy_len] ), |
| HannesTschofenig | 0:796d0f61a05b | 341 | copy_len ); |
| HannesTschofenig | 0:796d0f61a05b | 342 | |
| HannesTschofenig | 0:796d0f61a05b | 343 | ctx->unprocessed_len += copy_len; |
| HannesTschofenig | 0:796d0f61a05b | 344 | ilen -= copy_len; |
| HannesTschofenig | 0:796d0f61a05b | 345 | } |
| HannesTschofenig | 0:796d0f61a05b | 346 | |
| HannesTschofenig | 0:796d0f61a05b | 347 | /* |
| HannesTschofenig | 0:796d0f61a05b | 348 | * Process remaining full blocks |
| HannesTschofenig | 0:796d0f61a05b | 349 | */ |
| HannesTschofenig | 0:796d0f61a05b | 350 | if( ilen ) |
| HannesTschofenig | 0:796d0f61a05b | 351 | { |
| HannesTschofenig | 0:796d0f61a05b | 352 | if( 0 != ( ret = ctx->cipher_info->base->cbc_func( ctx->cipher_ctx, |
| HannesTschofenig | 0:796d0f61a05b | 353 | ctx->operation, ilen, ctx->iv, input, output ) ) ) |
| HannesTschofenig | 0:796d0f61a05b | 354 | { |
| HannesTschofenig | 0:796d0f61a05b | 355 | return ret; |
| HannesTschofenig | 0:796d0f61a05b | 356 | } |
| HannesTschofenig | 0:796d0f61a05b | 357 | |
| HannesTschofenig | 0:796d0f61a05b | 358 | *olen += ilen; |
| HannesTschofenig | 0:796d0f61a05b | 359 | } |
| HannesTschofenig | 0:796d0f61a05b | 360 | |
| HannesTschofenig | 0:796d0f61a05b | 361 | return 0; |
| HannesTschofenig | 0:796d0f61a05b | 362 | } |
| HannesTschofenig | 0:796d0f61a05b | 363 | #endif /* POLARSSL_CIPHER_MODE_CBC */ |
| HannesTschofenig | 0:796d0f61a05b | 364 | |
| HannesTschofenig | 0:796d0f61a05b | 365 | #if defined(POLARSSL_CIPHER_MODE_CFB) |
| HannesTschofenig | 0:796d0f61a05b | 366 | if( ctx->cipher_info->mode == POLARSSL_MODE_CFB ) |
| HannesTschofenig | 0:796d0f61a05b | 367 | { |
| HannesTschofenig | 0:796d0f61a05b | 368 | if( 0 != ( ret = ctx->cipher_info->base->cfb_func( ctx->cipher_ctx, |
| HannesTschofenig | 0:796d0f61a05b | 369 | ctx->operation, ilen, &ctx->unprocessed_len, ctx->iv, |
| HannesTschofenig | 0:796d0f61a05b | 370 | input, output ) ) ) |
| HannesTschofenig | 0:796d0f61a05b | 371 | { |
| HannesTschofenig | 0:796d0f61a05b | 372 | return ret; |
| HannesTschofenig | 0:796d0f61a05b | 373 | } |
| HannesTschofenig | 0:796d0f61a05b | 374 | |
| HannesTschofenig | 0:796d0f61a05b | 375 | *olen = ilen; |
| HannesTschofenig | 0:796d0f61a05b | 376 | |
| HannesTschofenig | 0:796d0f61a05b | 377 | return 0; |
| HannesTschofenig | 0:796d0f61a05b | 378 | } |
| HannesTschofenig | 0:796d0f61a05b | 379 | #endif /* POLARSSL_CIPHER_MODE_CFB */ |
| HannesTschofenig | 0:796d0f61a05b | 380 | |
| HannesTschofenig | 0:796d0f61a05b | 381 | #if defined(POLARSSL_CIPHER_MODE_CTR) |
| HannesTschofenig | 0:796d0f61a05b | 382 | if( ctx->cipher_info->mode == POLARSSL_MODE_CTR ) |
| HannesTschofenig | 0:796d0f61a05b | 383 | { |
| HannesTschofenig | 0:796d0f61a05b | 384 | if( 0 != ( ret = ctx->cipher_info->base->ctr_func( ctx->cipher_ctx, |
| HannesTschofenig | 0:796d0f61a05b | 385 | ilen, &ctx->unprocessed_len, ctx->iv, |
| HannesTschofenig | 0:796d0f61a05b | 386 | ctx->unprocessed_data, input, output ) ) ) |
| HannesTschofenig | 0:796d0f61a05b | 387 | { |
| HannesTschofenig | 0:796d0f61a05b | 388 | return ret; |
| HannesTschofenig | 0:796d0f61a05b | 389 | } |
| HannesTschofenig | 0:796d0f61a05b | 390 | |
| HannesTschofenig | 0:796d0f61a05b | 391 | *olen = ilen; |
| HannesTschofenig | 0:796d0f61a05b | 392 | |
| HannesTschofenig | 0:796d0f61a05b | 393 | return 0; |
| HannesTschofenig | 0:796d0f61a05b | 394 | } |
| HannesTschofenig | 0:796d0f61a05b | 395 | #endif /* POLARSSL_CIPHER_MODE_CTR */ |
| HannesTschofenig | 0:796d0f61a05b | 396 | |
| HannesTschofenig | 0:796d0f61a05b | 397 | #if defined(POLARSSL_CIPHER_MODE_STREAM) |
| HannesTschofenig | 0:796d0f61a05b | 398 | if( ctx->cipher_info->mode == POLARSSL_MODE_STREAM ) |
| HannesTschofenig | 0:796d0f61a05b | 399 | { |
| HannesTschofenig | 0:796d0f61a05b | 400 | if( 0 != ( ret = ctx->cipher_info->base->stream_func( ctx->cipher_ctx, |
| HannesTschofenig | 0:796d0f61a05b | 401 | ilen, input, output ) ) ) |
| HannesTschofenig | 0:796d0f61a05b | 402 | { |
| HannesTschofenig | 0:796d0f61a05b | 403 | return ret; |
| HannesTschofenig | 0:796d0f61a05b | 404 | } |
| HannesTschofenig | 0:796d0f61a05b | 405 | |
| HannesTschofenig | 0:796d0f61a05b | 406 | *olen = ilen; |
| HannesTschofenig | 0:796d0f61a05b | 407 | |
| HannesTschofenig | 0:796d0f61a05b | 408 | return 0; |
| HannesTschofenig | 0:796d0f61a05b | 409 | } |
| HannesTschofenig | 0:796d0f61a05b | 410 | #endif /* POLARSSL_CIPHER_MODE_STREAM */ |
| HannesTschofenig | 0:796d0f61a05b | 411 | |
| HannesTschofenig | 0:796d0f61a05b | 412 | return POLARSSL_ERR_CIPHER_FEATURE_UNAVAILABLE; |
| HannesTschofenig | 0:796d0f61a05b | 413 | } |
| HannesTschofenig | 0:796d0f61a05b | 414 | |
| HannesTschofenig | 0:796d0f61a05b | 415 | #if defined(POLARSSL_CIPHER_MODE_WITH_PADDING) |
| HannesTschofenig | 0:796d0f61a05b | 416 | #if defined(POLARSSL_CIPHER_PADDING_PKCS7) |
| HannesTschofenig | 0:796d0f61a05b | 417 | /* |
| HannesTschofenig | 0:796d0f61a05b | 418 | * PKCS7 (and PKCS5) padding: fill with ll bytes, with ll = padding_len |
| HannesTschofenig | 0:796d0f61a05b | 419 | */ |
| HannesTschofenig | 0:796d0f61a05b | 420 | static void add_pkcs_padding( unsigned char *output, size_t output_len, |
| HannesTschofenig | 0:796d0f61a05b | 421 | size_t data_len ) |
| HannesTschofenig | 0:796d0f61a05b | 422 | { |
| HannesTschofenig | 0:796d0f61a05b | 423 | size_t padding_len = output_len - data_len; |
| HannesTschofenig | 0:796d0f61a05b | 424 | unsigned char i; |
| HannesTschofenig | 0:796d0f61a05b | 425 | |
| HannesTschofenig | 0:796d0f61a05b | 426 | for( i = 0; i < padding_len; i++ ) |
| HannesTschofenig | 0:796d0f61a05b | 427 | output[data_len + i] = (unsigned char) padding_len; |
| HannesTschofenig | 0:796d0f61a05b | 428 | } |
| HannesTschofenig | 0:796d0f61a05b | 429 | |
| HannesTschofenig | 0:796d0f61a05b | 430 | static int get_pkcs_padding( unsigned char *input, size_t input_len, |
| HannesTschofenig | 0:796d0f61a05b | 431 | size_t *data_len ) |
| HannesTschofenig | 0:796d0f61a05b | 432 | { |
| HannesTschofenig | 0:796d0f61a05b | 433 | size_t i, pad_idx; |
| HannesTschofenig | 0:796d0f61a05b | 434 | unsigned char padding_len, bad = 0; |
| HannesTschofenig | 0:796d0f61a05b | 435 | |
| HannesTschofenig | 0:796d0f61a05b | 436 | if( NULL == input || NULL == data_len ) |
| HannesTschofenig | 0:796d0f61a05b | 437 | return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA; |
| HannesTschofenig | 0:796d0f61a05b | 438 | |
| HannesTschofenig | 0:796d0f61a05b | 439 | padding_len = input[input_len - 1]; |
| HannesTschofenig | 0:796d0f61a05b | 440 | *data_len = input_len - padding_len; |
| HannesTschofenig | 0:796d0f61a05b | 441 | |
| HannesTschofenig | 0:796d0f61a05b | 442 | /* Avoid logical || since it results in a branch */ |
| HannesTschofenig | 0:796d0f61a05b | 443 | bad |= padding_len > input_len; |
| HannesTschofenig | 0:796d0f61a05b | 444 | bad |= padding_len == 0; |
| HannesTschofenig | 0:796d0f61a05b | 445 | |
| HannesTschofenig | 0:796d0f61a05b | 446 | /* The number of bytes checked must be independent of padding_len, |
| HannesTschofenig | 0:796d0f61a05b | 447 | * so pick input_len, which is usually 8 or 16 (one block) */ |
| HannesTschofenig | 0:796d0f61a05b | 448 | pad_idx = input_len - padding_len; |
| HannesTschofenig | 0:796d0f61a05b | 449 | for( i = 0; i < input_len; i++ ) |
| HannesTschofenig | 0:796d0f61a05b | 450 | bad |= ( input[i] ^ padding_len ) * ( i >= pad_idx ); |
| HannesTschofenig | 0:796d0f61a05b | 451 | |
| HannesTschofenig | 0:796d0f61a05b | 452 | return POLARSSL_ERR_CIPHER_INVALID_PADDING * (bad != 0); |
| HannesTschofenig | 0:796d0f61a05b | 453 | } |
| HannesTschofenig | 0:796d0f61a05b | 454 | #endif /* POLARSSL_CIPHER_PADDING_PKCS7 */ |
| HannesTschofenig | 0:796d0f61a05b | 455 | |
| HannesTschofenig | 0:796d0f61a05b | 456 | #if defined(POLARSSL_CIPHER_PADDING_ONE_AND_ZEROS) |
| HannesTschofenig | 0:796d0f61a05b | 457 | /* |
| HannesTschofenig | 0:796d0f61a05b | 458 | * One and zeros padding: fill with 80 00 ... 00 |
| HannesTschofenig | 0:796d0f61a05b | 459 | */ |
| HannesTschofenig | 0:796d0f61a05b | 460 | static void add_one_and_zeros_padding( unsigned char *output, |
| HannesTschofenig | 0:796d0f61a05b | 461 | size_t output_len, size_t data_len ) |
| HannesTschofenig | 0:796d0f61a05b | 462 | { |
| HannesTschofenig | 0:796d0f61a05b | 463 | size_t padding_len = output_len - data_len; |
| HannesTschofenig | 0:796d0f61a05b | 464 | unsigned char i = 0; |
| HannesTschofenig | 0:796d0f61a05b | 465 | |
| HannesTschofenig | 0:796d0f61a05b | 466 | output[data_len] = 0x80; |
| HannesTschofenig | 0:796d0f61a05b | 467 | for( i = 1; i < padding_len; i++ ) |
| HannesTschofenig | 0:796d0f61a05b | 468 | output[data_len + i] = 0x00; |
| HannesTschofenig | 0:796d0f61a05b | 469 | } |
| HannesTschofenig | 0:796d0f61a05b | 470 | |
| HannesTschofenig | 0:796d0f61a05b | 471 | static int get_one_and_zeros_padding( unsigned char *input, size_t input_len, |
| HannesTschofenig | 0:796d0f61a05b | 472 | size_t *data_len ) |
| HannesTschofenig | 0:796d0f61a05b | 473 | { |
| HannesTschofenig | 0:796d0f61a05b | 474 | size_t i; |
| HannesTschofenig | 0:796d0f61a05b | 475 | unsigned char done = 0, prev_done, bad; |
| HannesTschofenig | 0:796d0f61a05b | 476 | |
| HannesTschofenig | 0:796d0f61a05b | 477 | if( NULL == input || NULL == data_len ) |
| HannesTschofenig | 0:796d0f61a05b | 478 | return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA; |
| HannesTschofenig | 0:796d0f61a05b | 479 | |
| HannesTschofenig | 0:796d0f61a05b | 480 | bad = 0xFF; |
| HannesTschofenig | 0:796d0f61a05b | 481 | *data_len = 0; |
| HannesTschofenig | 0:796d0f61a05b | 482 | for( i = input_len; i > 0; i-- ) |
| HannesTschofenig | 0:796d0f61a05b | 483 | { |
| HannesTschofenig | 0:796d0f61a05b | 484 | prev_done = done; |
| HannesTschofenig | 0:796d0f61a05b | 485 | done |= ( input[i-1] != 0 ); |
| HannesTschofenig | 0:796d0f61a05b | 486 | *data_len |= ( i - 1 ) * ( done != prev_done ); |
| HannesTschofenig | 0:796d0f61a05b | 487 | bad &= ( input[i-1] ^ 0x80 ) | ( done == prev_done ); |
| HannesTschofenig | 0:796d0f61a05b | 488 | } |
| HannesTschofenig | 0:796d0f61a05b | 489 | |
| HannesTschofenig | 0:796d0f61a05b | 490 | return POLARSSL_ERR_CIPHER_INVALID_PADDING * (bad != 0); |
| HannesTschofenig | 0:796d0f61a05b | 491 | |
| HannesTschofenig | 0:796d0f61a05b | 492 | } |
| HannesTschofenig | 0:796d0f61a05b | 493 | #endif /* POLARSSL_CIPHER_PADDING_ONE_AND_ZEROS */ |
| HannesTschofenig | 0:796d0f61a05b | 494 | |
| HannesTschofenig | 0:796d0f61a05b | 495 | #if defined(POLARSSL_CIPHER_PADDING_ZEROS_AND_LEN) |
| HannesTschofenig | 0:796d0f61a05b | 496 | /* |
| HannesTschofenig | 0:796d0f61a05b | 497 | * Zeros and len padding: fill with 00 ... 00 ll, where ll is padding length |
| HannesTschofenig | 0:796d0f61a05b | 498 | */ |
| HannesTschofenig | 0:796d0f61a05b | 499 | static void add_zeros_and_len_padding( unsigned char *output, |
| HannesTschofenig | 0:796d0f61a05b | 500 | size_t output_len, size_t data_len ) |
| HannesTschofenig | 0:796d0f61a05b | 501 | { |
| HannesTschofenig | 0:796d0f61a05b | 502 | size_t padding_len = output_len - data_len; |
| HannesTschofenig | 0:796d0f61a05b | 503 | unsigned char i = 0; |
| HannesTschofenig | 0:796d0f61a05b | 504 | |
| HannesTschofenig | 0:796d0f61a05b | 505 | for( i = 1; i < padding_len; i++ ) |
| HannesTschofenig | 0:796d0f61a05b | 506 | output[data_len + i - 1] = 0x00; |
| HannesTschofenig | 0:796d0f61a05b | 507 | output[output_len - 1] = (unsigned char) padding_len; |
| HannesTschofenig | 0:796d0f61a05b | 508 | } |
| HannesTschofenig | 0:796d0f61a05b | 509 | |
| HannesTschofenig | 0:796d0f61a05b | 510 | static int get_zeros_and_len_padding( unsigned char *input, size_t input_len, |
| HannesTschofenig | 0:796d0f61a05b | 511 | size_t *data_len ) |
| HannesTschofenig | 0:796d0f61a05b | 512 | { |
| HannesTschofenig | 0:796d0f61a05b | 513 | size_t i, pad_idx; |
| HannesTschofenig | 0:796d0f61a05b | 514 | unsigned char padding_len, bad = 0; |
| HannesTschofenig | 0:796d0f61a05b | 515 | |
| HannesTschofenig | 0:796d0f61a05b | 516 | if( NULL == input || NULL == data_len ) |
| HannesTschofenig | 0:796d0f61a05b | 517 | return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA; |
| HannesTschofenig | 0:796d0f61a05b | 518 | |
| HannesTschofenig | 0:796d0f61a05b | 519 | padding_len = input[input_len - 1]; |
| HannesTschofenig | 0:796d0f61a05b | 520 | *data_len = input_len - padding_len; |
| HannesTschofenig | 0:796d0f61a05b | 521 | |
| HannesTschofenig | 0:796d0f61a05b | 522 | /* Avoid logical || since it results in a branch */ |
| HannesTschofenig | 0:796d0f61a05b | 523 | bad |= padding_len > input_len; |
| HannesTschofenig | 0:796d0f61a05b | 524 | bad |= padding_len == 0; |
| HannesTschofenig | 0:796d0f61a05b | 525 | |
| HannesTschofenig | 0:796d0f61a05b | 526 | /* The number of bytes checked must be independent of padding_len */ |
| HannesTschofenig | 0:796d0f61a05b | 527 | pad_idx = input_len - padding_len; |
| HannesTschofenig | 0:796d0f61a05b | 528 | for( i = 0; i < input_len - 1; i++ ) |
| HannesTschofenig | 0:796d0f61a05b | 529 | bad |= input[i] * ( i >= pad_idx ); |
| HannesTschofenig | 0:796d0f61a05b | 530 | |
| HannesTschofenig | 0:796d0f61a05b | 531 | return POLARSSL_ERR_CIPHER_INVALID_PADDING * (bad != 0); |
| HannesTschofenig | 0:796d0f61a05b | 532 | } |
| HannesTschofenig | 0:796d0f61a05b | 533 | #endif /* POLARSSL_CIPHER_PADDING_ZEROS_AND_LEN */ |
| HannesTschofenig | 0:796d0f61a05b | 534 | |
| HannesTschofenig | 0:796d0f61a05b | 535 | #if defined(POLARSSL_CIPHER_PADDING_ZEROS) |
| HannesTschofenig | 0:796d0f61a05b | 536 | /* |
| HannesTschofenig | 0:796d0f61a05b | 537 | * Zero padding: fill with 00 ... 00 |
| HannesTschofenig | 0:796d0f61a05b | 538 | */ |
| HannesTschofenig | 0:796d0f61a05b | 539 | static void add_zeros_padding( unsigned char *output, |
| HannesTschofenig | 0:796d0f61a05b | 540 | size_t output_len, size_t data_len ) |
| HannesTschofenig | 0:796d0f61a05b | 541 | { |
| HannesTschofenig | 0:796d0f61a05b | 542 | size_t i; |
| HannesTschofenig | 0:796d0f61a05b | 543 | |
| HannesTschofenig | 0:796d0f61a05b | 544 | for( i = data_len; i < output_len; i++ ) |
| HannesTschofenig | 0:796d0f61a05b | 545 | output[i] = 0x00; |
| HannesTschofenig | 0:796d0f61a05b | 546 | } |
| HannesTschofenig | 0:796d0f61a05b | 547 | |
| HannesTschofenig | 0:796d0f61a05b | 548 | static int get_zeros_padding( unsigned char *input, size_t input_len, |
| HannesTschofenig | 0:796d0f61a05b | 549 | size_t *data_len ) |
| HannesTschofenig | 0:796d0f61a05b | 550 | { |
| HannesTschofenig | 0:796d0f61a05b | 551 | size_t i; |
| HannesTschofenig | 0:796d0f61a05b | 552 | unsigned char done = 0, prev_done; |
| HannesTschofenig | 0:796d0f61a05b | 553 | |
| HannesTschofenig | 0:796d0f61a05b | 554 | if( NULL == input || NULL == data_len ) |
| HannesTschofenig | 0:796d0f61a05b | 555 | return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA; |
| HannesTschofenig | 0:796d0f61a05b | 556 | |
| HannesTschofenig | 0:796d0f61a05b | 557 | *data_len = 0; |
| HannesTschofenig | 0:796d0f61a05b | 558 | for( i = input_len; i > 0; i-- ) |
| HannesTschofenig | 0:796d0f61a05b | 559 | { |
| HannesTschofenig | 0:796d0f61a05b | 560 | prev_done = done; |
| HannesTschofenig | 0:796d0f61a05b | 561 | done |= ( input[i-1] != 0 ); |
| HannesTschofenig | 0:796d0f61a05b | 562 | *data_len |= i * ( done != prev_done ); |
| HannesTschofenig | 0:796d0f61a05b | 563 | } |
| HannesTschofenig | 0:796d0f61a05b | 564 | |
| HannesTschofenig | 0:796d0f61a05b | 565 | return 0; |
| HannesTschofenig | 0:796d0f61a05b | 566 | } |
| HannesTschofenig | 0:796d0f61a05b | 567 | #endif /* POLARSSL_CIPHER_PADDING_ZEROS */ |
| HannesTschofenig | 0:796d0f61a05b | 568 | |
| HannesTschofenig | 0:796d0f61a05b | 569 | /* |
| HannesTschofenig | 0:796d0f61a05b | 570 | * No padding: don't pad :) |
| HannesTschofenig | 0:796d0f61a05b | 571 | * |
| HannesTschofenig | 0:796d0f61a05b | 572 | * There is no add_padding function (check for NULL in cipher_finish) |
| HannesTschofenig | 0:796d0f61a05b | 573 | * but a trivial get_padding function |
| HannesTschofenig | 0:796d0f61a05b | 574 | */ |
| HannesTschofenig | 0:796d0f61a05b | 575 | static int get_no_padding( unsigned char *input, size_t input_len, |
| HannesTschofenig | 0:796d0f61a05b | 576 | size_t *data_len ) |
| HannesTschofenig | 0:796d0f61a05b | 577 | { |
| HannesTschofenig | 0:796d0f61a05b | 578 | if( NULL == input || NULL == data_len ) |
| HannesTschofenig | 0:796d0f61a05b | 579 | return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA; |
| HannesTschofenig | 0:796d0f61a05b | 580 | |
| HannesTschofenig | 0:796d0f61a05b | 581 | *data_len = input_len; |
| HannesTschofenig | 0:796d0f61a05b | 582 | |
| HannesTschofenig | 0:796d0f61a05b | 583 | return 0; |
| HannesTschofenig | 0:796d0f61a05b | 584 | } |
| HannesTschofenig | 0:796d0f61a05b | 585 | #endif /* POLARSSL_CIPHER_MODE_WITH_PADDING */ |
| HannesTschofenig | 0:796d0f61a05b | 586 | |
| HannesTschofenig | 0:796d0f61a05b | 587 | int cipher_finish( cipher_context_t *ctx, |
| HannesTschofenig | 0:796d0f61a05b | 588 | unsigned char *output, size_t *olen ) |
| HannesTschofenig | 0:796d0f61a05b | 589 | { |
| HannesTschofenig | 0:796d0f61a05b | 590 | if( NULL == ctx || NULL == ctx->cipher_info || NULL == olen ) |
| HannesTschofenig | 0:796d0f61a05b | 591 | return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA; |
| HannesTschofenig | 0:796d0f61a05b | 592 | |
| HannesTschofenig | 0:796d0f61a05b | 593 | *olen = 0; |
| HannesTschofenig | 0:796d0f61a05b | 594 | |
| HannesTschofenig | 0:796d0f61a05b | 595 | if( POLARSSL_MODE_CFB == ctx->cipher_info->mode || |
| HannesTschofenig | 0:796d0f61a05b | 596 | POLARSSL_MODE_CTR == ctx->cipher_info->mode || |
| HannesTschofenig | 0:796d0f61a05b | 597 | POLARSSL_MODE_GCM == ctx->cipher_info->mode || |
| HannesTschofenig | 0:796d0f61a05b | 598 | POLARSSL_MODE_STREAM == ctx->cipher_info->mode ) |
| HannesTschofenig | 0:796d0f61a05b | 599 | { |
| HannesTschofenig | 0:796d0f61a05b | 600 | return 0; |
| HannesTschofenig | 0:796d0f61a05b | 601 | } |
| HannesTschofenig | 0:796d0f61a05b | 602 | |
| HannesTschofenig | 0:796d0f61a05b | 603 | if( POLARSSL_MODE_ECB == ctx->cipher_info->mode ) |
| HannesTschofenig | 0:796d0f61a05b | 604 | { |
| HannesTschofenig | 0:796d0f61a05b | 605 | if( ctx->unprocessed_len != 0 ) |
| HannesTschofenig | 0:796d0f61a05b | 606 | return POLARSSL_ERR_CIPHER_FULL_BLOCK_EXPECTED; |
| HannesTschofenig | 0:796d0f61a05b | 607 | |
| HannesTschofenig | 0:796d0f61a05b | 608 | return 0; |
| HannesTschofenig | 0:796d0f61a05b | 609 | } |
| HannesTschofenig | 0:796d0f61a05b | 610 | |
| HannesTschofenig | 0:796d0f61a05b | 611 | #if defined(POLARSSL_CIPHER_MODE_CBC) |
| HannesTschofenig | 0:796d0f61a05b | 612 | if( POLARSSL_MODE_CBC == ctx->cipher_info->mode ) |
| HannesTschofenig | 0:796d0f61a05b | 613 | { |
| HannesTschofenig | 0:796d0f61a05b | 614 | int ret = 0; |
| HannesTschofenig | 0:796d0f61a05b | 615 | |
| HannesTschofenig | 0:796d0f61a05b | 616 | if( POLARSSL_ENCRYPT == ctx->operation ) |
| HannesTschofenig | 0:796d0f61a05b | 617 | { |
| HannesTschofenig | 0:796d0f61a05b | 618 | /* check for 'no padding' mode */ |
| HannesTschofenig | 0:796d0f61a05b | 619 | if( NULL == ctx->add_padding ) |
| HannesTschofenig | 0:796d0f61a05b | 620 | { |
| HannesTschofenig | 0:796d0f61a05b | 621 | if( 0 != ctx->unprocessed_len ) |
| HannesTschofenig | 0:796d0f61a05b | 622 | return POLARSSL_ERR_CIPHER_FULL_BLOCK_EXPECTED; |
| HannesTschofenig | 0:796d0f61a05b | 623 | |
| HannesTschofenig | 0:796d0f61a05b | 624 | return 0; |
| HannesTschofenig | 0:796d0f61a05b | 625 | } |
| HannesTschofenig | 0:796d0f61a05b | 626 | |
| HannesTschofenig | 0:796d0f61a05b | 627 | ctx->add_padding( ctx->unprocessed_data, cipher_get_iv_size( ctx ), |
| HannesTschofenig | 0:796d0f61a05b | 628 | ctx->unprocessed_len ); |
| HannesTschofenig | 0:796d0f61a05b | 629 | } |
| HannesTschofenig | 0:796d0f61a05b | 630 | else if ( cipher_get_block_size( ctx ) != ctx->unprocessed_len ) |
| HannesTschofenig | 0:796d0f61a05b | 631 | { |
| HannesTschofenig | 0:796d0f61a05b | 632 | /* |
| HannesTschofenig | 0:796d0f61a05b | 633 | * For decrypt operations, expect a full block, |
| HannesTschofenig | 0:796d0f61a05b | 634 | * or an empty block if no padding |
| HannesTschofenig | 0:796d0f61a05b | 635 | */ |
| HannesTschofenig | 0:796d0f61a05b | 636 | if( NULL == ctx->add_padding && 0 == ctx->unprocessed_len ) |
| HannesTschofenig | 0:796d0f61a05b | 637 | return 0; |
| HannesTschofenig | 0:796d0f61a05b | 638 | |
| HannesTschofenig | 0:796d0f61a05b | 639 | return POLARSSL_ERR_CIPHER_FULL_BLOCK_EXPECTED; |
| HannesTschofenig | 0:796d0f61a05b | 640 | } |
| HannesTschofenig | 0:796d0f61a05b | 641 | |
| HannesTschofenig | 0:796d0f61a05b | 642 | /* cipher block */ |
| HannesTschofenig | 0:796d0f61a05b | 643 | if( 0 != ( ret = ctx->cipher_info->base->cbc_func( ctx->cipher_ctx, |
| HannesTschofenig | 0:796d0f61a05b | 644 | ctx->operation, cipher_get_block_size( ctx ), ctx->iv, |
| HannesTschofenig | 0:796d0f61a05b | 645 | ctx->unprocessed_data, output ) ) ) |
| HannesTschofenig | 0:796d0f61a05b | 646 | { |
| HannesTschofenig | 0:796d0f61a05b | 647 | return ret; |
| HannesTschofenig | 0:796d0f61a05b | 648 | } |
| HannesTschofenig | 0:796d0f61a05b | 649 | |
| HannesTschofenig | 0:796d0f61a05b | 650 | /* Set output size for decryption */ |
| HannesTschofenig | 0:796d0f61a05b | 651 | if( POLARSSL_DECRYPT == ctx->operation ) |
| HannesTschofenig | 0:796d0f61a05b | 652 | return ctx->get_padding( output, cipher_get_block_size( ctx ), |
| HannesTschofenig | 0:796d0f61a05b | 653 | olen ); |
| HannesTschofenig | 0:796d0f61a05b | 654 | |
| HannesTschofenig | 0:796d0f61a05b | 655 | /* Set output size for encryption */ |
| HannesTschofenig | 0:796d0f61a05b | 656 | *olen = cipher_get_block_size( ctx ); |
| HannesTschofenig | 0:796d0f61a05b | 657 | return 0; |
| HannesTschofenig | 0:796d0f61a05b | 658 | } |
| HannesTschofenig | 0:796d0f61a05b | 659 | #else |
| HannesTschofenig | 0:796d0f61a05b | 660 | ((void) output); |
| HannesTschofenig | 0:796d0f61a05b | 661 | #endif /* POLARSSL_CIPHER_MODE_CBC */ |
| HannesTschofenig | 0:796d0f61a05b | 662 | |
| HannesTschofenig | 0:796d0f61a05b | 663 | return POLARSSL_ERR_CIPHER_FEATURE_UNAVAILABLE; |
| HannesTschofenig | 0:796d0f61a05b | 664 | } |
| HannesTschofenig | 0:796d0f61a05b | 665 | |
| HannesTschofenig | 0:796d0f61a05b | 666 | #if defined(POLARSSL_CIPHER_MODE_WITH_PADDING) |
| HannesTschofenig | 0:796d0f61a05b | 667 | int cipher_set_padding_mode( cipher_context_t *ctx, cipher_padding_t mode ) |
| HannesTschofenig | 0:796d0f61a05b | 668 | { |
| HannesTschofenig | 0:796d0f61a05b | 669 | if( NULL == ctx || |
| HannesTschofenig | 0:796d0f61a05b | 670 | POLARSSL_MODE_CBC != ctx->cipher_info->mode ) |
| HannesTschofenig | 0:796d0f61a05b | 671 | { |
| HannesTschofenig | 0:796d0f61a05b | 672 | return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA; |
| HannesTschofenig | 0:796d0f61a05b | 673 | } |
| HannesTschofenig | 0:796d0f61a05b | 674 | |
| HannesTschofenig | 0:796d0f61a05b | 675 | switch( mode ) |
| HannesTschofenig | 0:796d0f61a05b | 676 | { |
| HannesTschofenig | 0:796d0f61a05b | 677 | #if defined(POLARSSL_CIPHER_PADDING_PKCS7) |
| HannesTschofenig | 0:796d0f61a05b | 678 | case POLARSSL_PADDING_PKCS7: |
| HannesTschofenig | 0:796d0f61a05b | 679 | ctx->add_padding = add_pkcs_padding; |
| HannesTschofenig | 0:796d0f61a05b | 680 | ctx->get_padding = get_pkcs_padding; |
| HannesTschofenig | 0:796d0f61a05b | 681 | break; |
| HannesTschofenig | 0:796d0f61a05b | 682 | #endif |
| HannesTschofenig | 0:796d0f61a05b | 683 | #if defined(POLARSSL_CIPHER_PADDING_ONE_AND_ZEROS) |
| HannesTschofenig | 0:796d0f61a05b | 684 | case POLARSSL_PADDING_ONE_AND_ZEROS: |
| HannesTschofenig | 0:796d0f61a05b | 685 | ctx->add_padding = add_one_and_zeros_padding; |
| HannesTschofenig | 0:796d0f61a05b | 686 | ctx->get_padding = get_one_and_zeros_padding; |
| HannesTschofenig | 0:796d0f61a05b | 687 | break; |
| HannesTschofenig | 0:796d0f61a05b | 688 | #endif |
| HannesTschofenig | 0:796d0f61a05b | 689 | #if defined(POLARSSL_CIPHER_PADDING_ZEROS_AND_LEN) |
| HannesTschofenig | 0:796d0f61a05b | 690 | case POLARSSL_PADDING_ZEROS_AND_LEN: |
| HannesTschofenig | 0:796d0f61a05b | 691 | ctx->add_padding = add_zeros_and_len_padding; |
| HannesTschofenig | 0:796d0f61a05b | 692 | ctx->get_padding = get_zeros_and_len_padding; |
| HannesTschofenig | 0:796d0f61a05b | 693 | break; |
| HannesTschofenig | 0:796d0f61a05b | 694 | #endif |
| HannesTschofenig | 0:796d0f61a05b | 695 | #if defined(POLARSSL_CIPHER_PADDING_ZEROS) |
| HannesTschofenig | 0:796d0f61a05b | 696 | case POLARSSL_PADDING_ZEROS: |
| HannesTschofenig | 0:796d0f61a05b | 697 | ctx->add_padding = add_zeros_padding; |
| HannesTschofenig | 0:796d0f61a05b | 698 | ctx->get_padding = get_zeros_padding; |
| HannesTschofenig | 0:796d0f61a05b | 699 | break; |
| HannesTschofenig | 0:796d0f61a05b | 700 | #endif |
| HannesTschofenig | 0:796d0f61a05b | 701 | case POLARSSL_PADDING_NONE: |
| HannesTschofenig | 0:796d0f61a05b | 702 | ctx->add_padding = NULL; |
| HannesTschofenig | 0:796d0f61a05b | 703 | ctx->get_padding = get_no_padding; |
| HannesTschofenig | 0:796d0f61a05b | 704 | break; |
| HannesTschofenig | 0:796d0f61a05b | 705 | |
| HannesTschofenig | 0:796d0f61a05b | 706 | default: |
| HannesTschofenig | 0:796d0f61a05b | 707 | return POLARSSL_ERR_CIPHER_FEATURE_UNAVAILABLE; |
| HannesTschofenig | 0:796d0f61a05b | 708 | } |
| HannesTschofenig | 0:796d0f61a05b | 709 | |
| HannesTschofenig | 0:796d0f61a05b | 710 | return 0; |
| HannesTschofenig | 0:796d0f61a05b | 711 | } |
| HannesTschofenig | 0:796d0f61a05b | 712 | #endif /* POLARSSL_CIPHER_MODE_WITH_PADDING */ |
| HannesTschofenig | 0:796d0f61a05b | 713 | |
| HannesTschofenig | 0:796d0f61a05b | 714 | #if defined(POLARSSL_CIPHER_MODE_AEAD) |
| HannesTschofenig | 0:796d0f61a05b | 715 | int cipher_write_tag( cipher_context_t *ctx, |
| HannesTschofenig | 0:796d0f61a05b | 716 | unsigned char *tag, size_t tag_len ) |
| HannesTschofenig | 0:796d0f61a05b | 717 | { |
| HannesTschofenig | 0:796d0f61a05b | 718 | if( NULL == ctx || NULL == ctx->cipher_info || NULL == tag ) |
| HannesTschofenig | 0:796d0f61a05b | 719 | return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA; |
| HannesTschofenig | 0:796d0f61a05b | 720 | |
| HannesTschofenig | 0:796d0f61a05b | 721 | if( POLARSSL_ENCRYPT != ctx->operation ) |
| HannesTschofenig | 0:796d0f61a05b | 722 | return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA; |
| HannesTschofenig | 0:796d0f61a05b | 723 | |
| HannesTschofenig | 0:796d0f61a05b | 724 | #if defined(POLARSSL_GCM_C) |
| HannesTschofenig | 0:796d0f61a05b | 725 | if( POLARSSL_MODE_GCM == ctx->cipher_info->mode ) |
| HannesTschofenig | 0:796d0f61a05b | 726 | return gcm_finish( (gcm_context *) ctx->cipher_ctx, tag, tag_len ); |
| HannesTschofenig | 0:796d0f61a05b | 727 | #endif |
| HannesTschofenig | 0:796d0f61a05b | 728 | |
| HannesTschofenig | 0:796d0f61a05b | 729 | return 0; |
| HannesTschofenig | 0:796d0f61a05b | 730 | } |
| HannesTschofenig | 0:796d0f61a05b | 731 | |
| HannesTschofenig | 0:796d0f61a05b | 732 | int cipher_check_tag( cipher_context_t *ctx, |
| HannesTschofenig | 0:796d0f61a05b | 733 | const unsigned char *tag, size_t tag_len ) |
| HannesTschofenig | 0:796d0f61a05b | 734 | { |
| HannesTschofenig | 0:796d0f61a05b | 735 | int ret; |
| HannesTschofenig | 0:796d0f61a05b | 736 | |
| HannesTschofenig | 0:796d0f61a05b | 737 | if( NULL == ctx || NULL == ctx->cipher_info || |
| HannesTschofenig | 0:796d0f61a05b | 738 | POLARSSL_DECRYPT != ctx->operation ) |
| HannesTschofenig | 0:796d0f61a05b | 739 | { |
| HannesTschofenig | 0:796d0f61a05b | 740 | return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA; |
| HannesTschofenig | 0:796d0f61a05b | 741 | } |
| HannesTschofenig | 0:796d0f61a05b | 742 | |
| HannesTschofenig | 0:796d0f61a05b | 743 | #if defined(POLARSSL_GCM_C) |
| HannesTschofenig | 0:796d0f61a05b | 744 | if( POLARSSL_MODE_GCM == ctx->cipher_info->mode ) |
| HannesTschofenig | 0:796d0f61a05b | 745 | { |
| HannesTschofenig | 0:796d0f61a05b | 746 | unsigned char check_tag[16]; |
| HannesTschofenig | 0:796d0f61a05b | 747 | size_t i; |
| HannesTschofenig | 0:796d0f61a05b | 748 | int diff; |
| HannesTschofenig | 0:796d0f61a05b | 749 | |
| HannesTschofenig | 0:796d0f61a05b | 750 | if( tag_len > sizeof( check_tag ) ) |
| HannesTschofenig | 0:796d0f61a05b | 751 | return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA; |
| HannesTschofenig | 0:796d0f61a05b | 752 | |
| HannesTschofenig | 0:796d0f61a05b | 753 | if( 0 != ( ret = gcm_finish( (gcm_context *) ctx->cipher_ctx, |
| HannesTschofenig | 0:796d0f61a05b | 754 | check_tag, tag_len ) ) ) |
| HannesTschofenig | 0:796d0f61a05b | 755 | { |
| HannesTschofenig | 0:796d0f61a05b | 756 | return( ret ); |
| HannesTschofenig | 0:796d0f61a05b | 757 | } |
| HannesTschofenig | 0:796d0f61a05b | 758 | |
| HannesTschofenig | 0:796d0f61a05b | 759 | /* Check the tag in "constant-time" */ |
| HannesTschofenig | 0:796d0f61a05b | 760 | for( diff = 0, i = 0; i < tag_len; i++ ) |
| HannesTschofenig | 0:796d0f61a05b | 761 | diff |= tag[i] ^ check_tag[i]; |
| HannesTschofenig | 0:796d0f61a05b | 762 | |
| HannesTschofenig | 0:796d0f61a05b | 763 | if( diff != 0 ) |
| HannesTschofenig | 0:796d0f61a05b | 764 | return( POLARSSL_ERR_CIPHER_AUTH_FAILED ); |
| HannesTschofenig | 0:796d0f61a05b | 765 | |
| HannesTschofenig | 0:796d0f61a05b | 766 | return( 0 ); |
| HannesTschofenig | 0:796d0f61a05b | 767 | } |
| HannesTschofenig | 0:796d0f61a05b | 768 | #endif /* POLARSSL_GCM_C */ |
| HannesTschofenig | 0:796d0f61a05b | 769 | |
| HannesTschofenig | 0:796d0f61a05b | 770 | return( 0 ); |
| HannesTschofenig | 0:796d0f61a05b | 771 | } |
| HannesTschofenig | 0:796d0f61a05b | 772 | #endif /* POLARSSL_CIPHER_MODE_AEAD */ |
| HannesTschofenig | 0:796d0f61a05b | 773 | |
| HannesTschofenig | 0:796d0f61a05b | 774 | #if defined(POLARSSL_SELF_TEST) |
| HannesTschofenig | 0:796d0f61a05b | 775 | |
| HannesTschofenig | 0:796d0f61a05b | 776 | /* |
| HannesTschofenig | 0:796d0f61a05b | 777 | * Checkup routine |
| HannesTschofenig | 0:796d0f61a05b | 778 | */ |
| HannesTschofenig | 0:796d0f61a05b | 779 | int cipher_self_test( int verbose ) |
| HannesTschofenig | 0:796d0f61a05b | 780 | { |
| HannesTschofenig | 0:796d0f61a05b | 781 | ((void) verbose); |
| HannesTschofenig | 0:796d0f61a05b | 782 | |
| HannesTschofenig | 0:796d0f61a05b | 783 | return( 0 ); |
| HannesTschofenig | 0:796d0f61a05b | 784 | } |
| HannesTschofenig | 0:796d0f61a05b | 785 | |
| HannesTschofenig | 0:796d0f61a05b | 786 | #endif /* POLARSSL_SELF_TEST */ |
| HannesTschofenig | 0:796d0f61a05b | 787 | |
| HannesTschofenig | 0:796d0f61a05b | 788 | #endif /* POLARSSL_CIPHER_C */ |
| HannesTschofenig | 0:796d0f61a05b | 789 | |
| HannesTschofenig | 0:796d0f61a05b | 790 |