| /** |
| * \file aes.h |
| * |
| * \brief AES block cipher |
| * |
| * Copyright (C) 2006-2013, Brainspark B.V. |
| * |
| * This file is part of PolarSSL (http://www.polarssl.org) |
| * Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org> |
| * |
| * All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License along |
| * with this program; if not, write to the Free Software Foundation, Inc., |
| * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| */ |
| #ifndef POLARSSL_AES_H |
| #define POLARSSL_AES_H |
| |
| #include "config.h" |
| |
| #include <string.h> |
| |
| #ifdef _MSC_VER |
| #include <basetsd.h> |
| typedef UINT32 uint32_t; |
| #else |
| #include <inttypes.h> |
| #endif |
| |
| #define AES_ENCRYPT 1 |
| #define AES_DECRYPT 0 |
| |
| #define POLARSSL_ERR_AES_INVALID_KEY_LENGTH -0x0020 /**< Invalid key length. */ |
| #define POLARSSL_ERR_AES_INVALID_INPUT_LENGTH -0x0022 /**< Invalid data input length. */ |
| |
| #if !defined(POLARSSL_AES_ALT) |
| // Regular implementation |
| // |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| /** |
| * \brief AES context structure |
| */ |
| typedef struct |
| { |
| int nr; /*!< number of rounds */ |
| uint32_t *rk; /*!< AES round keys */ |
| uint32_t buf[68]; /*!< unaligned data */ |
| } |
| aes_context; |
| |
| /** |
| * \brief AES key schedule (encryption) |
| * |
| * \param ctx AES context to be initialized |
| * \param key encryption key |
| * \param keysize must be 128, 192 or 256 |
| * |
| * \return 0 if successful, or POLARSSL_ERR_AES_INVALID_KEY_LENGTH |
| */ |
| int aes_setkey_enc( aes_context *ctx, const unsigned char *key, unsigned int keysize ); |
| |
| /** |
| * \brief AES key schedule (decryption) |
| * |
| * \param ctx AES context to be initialized |
| * \param key decryption key |
| * \param keysize must be 128, 192 or 256 |
| * |
| * \return 0 if successful, or POLARSSL_ERR_AES_INVALID_KEY_LENGTH |
| */ |
| int aes_setkey_dec( aes_context *ctx, const unsigned char *key, unsigned int keysize ); |
| |
| /** |
| * \brief AES-ECB block encryption/decryption |
| * |
| * \param ctx AES context |
| * \param mode AES_ENCRYPT or AES_DECRYPT |
| * \param input 16-byte input block |
| * \param output 16-byte output block |
| * |
| * \return 0 if successful |
| */ |
| int aes_crypt_ecb( aes_context *ctx, |
| int mode, |
| const unsigned char input[16], |
| unsigned char output[16] ); |
| |
| #if defined(POLARSSL_CIPHER_MODE_CBC) |
| /** |
| * \brief AES-CBC buffer encryption/decryption |
| * Length should be a multiple of the block |
| * size (16 bytes) |
| * |
| * \param ctx AES context |
| * \param mode AES_ENCRYPT or AES_DECRYPT |
| * \param length length of the input data |
| * \param iv initialization vector (updated after use) |
| * \param input buffer holding the input data |
| * \param output buffer holding the output data |
| * |
| * \return 0 if successful, or POLARSSL_ERR_AES_INVALID_INPUT_LENGTH |
| */ |
| int aes_crypt_cbc( aes_context *ctx, |
| int mode, |
| size_t length, |
| unsigned char iv[16], |
| const unsigned char *input, |
| unsigned char *output ); |
| #endif /* POLARSSL_CIPHER_MODE_CBC */ |
| |
| /** |
| * \brief AES-CFB128 buffer encryption/decryption. |
| * |
| * Note: Due to the nature of CFB you should use the same key schedule for |
| * both encryption and decryption. So a context initialized with |
| * aes_setkey_enc() for both AES_ENCRYPT and AES_DECRYPT. |
| * |
| * \param ctx AES context |
| * \param mode AES_ENCRYPT or AES_DECRYPT |
| * \param length length of the input data |
| * \param iv_off offset in IV (updated after use) |
| * \param iv initialization vector (updated after use) |
| * \param input buffer holding the input data |
| * \param output buffer holding the output data |
| * |
| * \return 0 if successful |
| */ |
| int aes_crypt_cfb128( aes_context *ctx, |
| int mode, |
| size_t length, |
| size_t *iv_off, |
| unsigned char iv[16], |
| const unsigned char *input, |
| unsigned char *output ); |
| |
| /** |
| * \brief AES-CTR buffer encryption/decryption |
| * |
| * Warning: You have to keep the maximum use of your counter in mind! |
| * |
| * Note: Due to the nature of CTR you should use the same key schedule for |
| * both encryption and decryption. So a context initialized with |
| * aes_setkey_enc() for both AES_ENCRYPT and AES_DECRYPT. |
| * |
| * \param ctx AES context |
| * \param length The length of the data |
| * \param nc_off The offset in the current stream_block (for resuming |
| * within current cipher stream). The offset pointer to |
| * should be 0 at the start of a stream. |
| * \param nonce_counter The 128-bit nonce and counter. |
| * \param stream_block The saved stream-block for resuming. Is overwritten |
| * by the function. |
| * \param input The input data stream |
| * \param output The output data stream |
| * |
| * \return 0 if successful |
| */ |
| int aes_crypt_ctr( aes_context *ctx, |
| size_t length, |
| size_t *nc_off, |
| unsigned char nonce_counter[16], |
| unsigned char stream_block[16], |
| const unsigned char *input, |
| unsigned char *output ); |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #else /* POLARSSL_AES_ALT */ |
| #include "aes_alt.h" |
| #endif /* POLARSSL_AES_ALT */ |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| /** |
| * \brief Checkup routine |
| * |
| * \return 0 if successful, or 1 if the test failed |
| */ |
| int aes_self_test( int verbose ); |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* aes.h */ |