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| 5496 | leency | 1 | /** |
| 2 | * \file aes.h |
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| 3 | * |
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| 4 | * \brief AES block cipher |
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| 5 | * |
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| 6 | * Copyright (C) 2006-2010, Brainspark B.V. |
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| 7 | * |
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| 8 | * This file is part of PolarSSL (http://www.polarssl.org) |
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| 9 | * Lead Maintainer: Paul Bakker |
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| 10 | * |
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| 11 | * All rights reserved. |
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| 12 | * |
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| 13 | * This program is free software; you can redistribute it and/or modify |
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| 14 | * it under the terms of the GNU General Public License as published by |
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| 15 | * the Free Software Foundation; either version 2 of the License, or |
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| 16 | * (at your option) any later version. |
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| 17 | * |
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| 18 | * This program is distributed in the hope that it will be useful, |
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| 19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 21 | * GNU General Public License for more details. |
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| 22 | * |
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| 23 | * You should have received a copy of the GNU General Public License along |
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| 24 | * with this program; if not, write to the Free Software Foundation, Inc., |
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| 25 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
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| 26 | */ |
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| 27 | #ifndef POLARSSL_AES_H |
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| 28 | #define POLARSSL_AES_H |
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| 29 | |||
| 30 | #include |
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| 31 | |||
| 32 | #ifdef _MSC_VER |
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| 33 | #include |
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| 34 | typedef UINT32 uint32_t; |
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| 35 | #else |
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| 36 | #include |
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| 37 | #endif |
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| 38 | |||
| 39 | #define AES_ENCRYPT 1 |
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| 40 | #define AES_DECRYPT 0 |
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| 41 | |||
| 42 | #define POLARSSL_ERR_AES_INVALID_KEY_LENGTH -0x0020 /**< Invalid key length. */ |
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| 43 | #define POLARSSL_ERR_AES_INVALID_INPUT_LENGTH -0x0022 /**< Invalid data input length. */ |
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| 44 | |||
| 45 | /** |
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| 46 | * \brief AES context structure |
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| 47 | */ |
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| 48 | typedef struct |
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| 49 | { |
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| 50 | int nr; /*!< number of rounds */ |
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| 51 | uint32_t *rk; /*!< AES round keys */ |
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| 52 | uint32_t buf[68]; /*!< unaligned data */ |
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| 53 | } |
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| 54 | aes_context; |
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| 55 | |||
| 56 | #ifdef __cplusplus |
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| 57 | extern "C" { |
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| 58 | #endif |
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| 59 | |||
| 60 | /** |
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| 61 | * \brief AES key schedule (encryption) |
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| 62 | * |
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| 63 | * \param ctx AES context to be initialized |
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| 64 | * \param key encryption key |
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| 65 | * \param keysize must be 128, 192 or 256 |
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| 66 | * |
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| 67 | * \return 0 if successful, or POLARSSL_ERR_AES_INVALID_KEY_LENGTH |
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| 68 | */ |
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| 69 | int aes_setkey_enc( aes_context *ctx, const unsigned char *key, unsigned int keysize ); |
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| 70 | |||
| 71 | /** |
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| 72 | * \brief AES key schedule (decryption) |
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| 73 | * |
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| 74 | * \param ctx AES context to be initialized |
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| 75 | * \param key decryption key |
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| 76 | * \param keysize must be 128, 192 or 256 |
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| 77 | * |
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| 78 | * \return 0 if successful, or POLARSSL_ERR_AES_INVALID_KEY_LENGTH |
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| 79 | */ |
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| 80 | int aes_setkey_dec( aes_context *ctx, const unsigned char *key, unsigned int keysize ); |
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| 81 | |||
| 82 | /** |
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| 83 | * \brief AES-ECB block encryption/decryption |
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| 84 | * |
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| 85 | * \param ctx AES context |
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| 86 | * \param mode AES_ENCRYPT or AES_DECRYPT |
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| 87 | * \param input 16-byte input block |
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| 88 | * \param output 16-byte output block |
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| 89 | * |
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| 90 | * \return 0 if successful |
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| 91 | */ |
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| 92 | int aes_crypt_ecb( aes_context *ctx, |
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| 93 | int mode, |
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| 94 | const unsigned char input[16], |
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| 95 | unsigned char output[16] ); |
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| 96 | |||
| 97 | /** |
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| 98 | * \brief AES-CBC buffer encryption/decryption |
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| 99 | * Length should be a multiple of the block |
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| 100 | * size (16 bytes) |
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| 101 | * |
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| 102 | * \param ctx AES context |
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| 103 | * \param mode AES_ENCRYPT or AES_DECRYPT |
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| 104 | * \param length length of the input data |
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| 105 | * \param iv initialization vector (updated after use) |
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| 106 | * \param input buffer holding the input data |
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| 107 | * \param output buffer holding the output data |
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| 108 | * |
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| 109 | * \return 0 if successful, or POLARSSL_ERR_AES_INVALID_INPUT_LENGTH |
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| 110 | */ |
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| 111 | int aes_crypt_cbc( aes_context *ctx, |
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| 112 | int mode, |
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| 113 | size_t length, |
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| 114 | unsigned char iv[16], |
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| 115 | const unsigned char *input, |
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| 116 | unsigned char *output ); |
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| 117 | |||
| 118 | /** |
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| 119 | * \brief AES-CFB128 buffer encryption/decryption. |
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| 120 | * |
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| 121 | * Note: Due to the nature of CFB you should use the same key schedule for |
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| 122 | * both encryption and decryption. So a context initialized with |
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| 123 | * aes_setkey_enc() for both AES_ENCRYPT and AES_DECRYPT. |
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| 124 | * |
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| 125 | * both |
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| 126 | * \param ctx AES context |
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| 127 | * \param mode AES_ENCRYPT or AES_DECRYPT |
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| 128 | * \param length length of the input data |
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| 129 | * \param iv_off offset in IV (updated after use) |
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| 130 | * \param iv initialization vector (updated after use) |
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| 131 | * \param input buffer holding the input data |
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| 132 | * \param output buffer holding the output data |
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| 133 | * |
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| 134 | * \return 0 if successful |
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| 135 | */ |
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| 136 | int aes_crypt_cfb128( aes_context *ctx, |
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| 137 | int mode, |
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| 138 | size_t length, |
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| 139 | size_t *iv_off, |
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| 140 | unsigned char iv[16], |
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| 141 | const unsigned char *input, |
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| 142 | unsigned char *output ); |
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| 143 | |||
| 144 | /** |
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| 145 | * \brief AES-CTR buffer encryption/decryption |
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| 146 | * |
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| 147 | * Warning: You have to keep the maximum use of your counter in mind! |
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| 148 | * |
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| 149 | * Note: Due to the nature of CTR you should use the same key schedule for |
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| 150 | * both encryption and decryption. So a context initialized with |
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| 151 | * aes_setkey_enc() for both AES_ENCRYPT and AES_DECRYPT. |
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| 152 | * |
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| 153 | * \param length The length of the data |
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| 154 | * \param nc_off The offset in the current stream_block (for resuming |
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| 155 | * within current cipher stream). The offset pointer to |
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| 156 | * should be 0 at the start of a stream. |
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| 157 | * \param nonce_counter The 128-bit nonce and counter. |
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| 158 | * \param stream_block The saved stream-block for resuming. Is overwritten |
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| 159 | * by the function. |
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| 160 | * \param input The input data stream |
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| 161 | * \param output The output data stream |
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| 162 | * |
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| 163 | * \return 0 if successful |
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| 164 | */ |
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| 165 | int aes_crypt_ctr( aes_context *ctx, |
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| 166 | size_t length, |
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| 167 | size_t *nc_off, |
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| 168 | unsigned char nonce_counter[16], |
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| 169 | unsigned char stream_block[16], |
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| 170 | const unsigned char *input, |
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| 171 | unsigned char *output ); |
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| 172 | /** |
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| 173 | * \brief Checkup routine |
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| 174 | * |
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| 175 | * \return 0 if successful, or 1 if the test failed |
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| 176 | */ |
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| 177 | int aes_self_test( int verbose ); |
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| 178 | |||
| 179 | #ifdef __cplusplus |
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| 180 | } |
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| 181 | #endif |
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| 182 | |||
| 183 | #endif /* aes.h */ |