/** * \file aes.h * * \brief The Advanced Encryption Standard (AES) specifies a FIPS-approved * cryptographic algorithm that can be used to protect electronic * data. * * The AES algorithm is a symmetric block cipher that can * encrypt and decrypt information. For more information, see * FIPS Publication 197: Advanced Encryption Standard and * ISO/IEC 18033-2:2006: Information technology -- Security * techniques -- Encryption algorithms -- Part 2: Asymmetric * ciphers. */ /* Copyright (C) 2006-2018, Arm Limited (or its affiliates), All Rights Reserved. * SPDX-License-Identifier: Apache-2.0 * * Licensed under the Apache License, Version 2.0 (the "License"); you may * not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * * This file is part of Mbed TLS (https://tls.mbed.org) */ #ifndef MBEDTLS_AES_H #define MBEDTLS_AES_H #if !defined(MBEDTLS_CONFIG_FILE) #include "config.h" #else #include MBEDTLS_CONFIG_FILE #endif #include #include /* padlock.c and aesni.c rely on these values! */ #define MBEDTLS_AES_ENCRYPT 1 /**< AES encryption. */ #define MBEDTLS_AES_DECRYPT 0 /**< AES decryption. */ /* Error codes in range 0x0020-0x0022 */ #define MBEDTLS_ERR_AES_INVALID_KEY_LENGTH -0x0020 /**< Invalid key length. */ #define MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH -0x0022 /**< Invalid data input length. */ /* Error codes in range 0x0023-0x0025 */ #define MBEDTLS_ERR_AES_FEATURE_UNAVAILABLE -0x0023 /**< Feature not available. For example, an unsupported AES key size. */ #define MBEDTLS_ERR_AES_HW_ACCEL_FAILED -0x0025 /**< AES hardware accelerator failed. */ #if ( defined(__ARMCC_VERSION) || defined(_MSC_VER) ) && \ !defined(inline) && !defined(__cplusplus) #define inline __inline #endif #if !defined(MBEDTLS_AES_ALT) // Regular implementation // #ifdef __cplusplus extern "C" { #endif /** * \brief The AES context-type definition. */ typedef struct { int nr; /*!< The number of rounds. */ uint32_t *rk; /*!< AES round keys. */ uint32_t buf[68]; /*!< Unaligned data buffer. This buffer can hold 32 extra Bytes, which can be used for one of the following purposes: */ } mbedtls_aes_context; /** * \brief This function initializes the specified AES context. * * It must be the first API called before using * the context. * * \param ctx The AES context to initialize. */ void mbedtls_aes_init( mbedtls_aes_context *ctx ); /** * \brief This function releases and clears the specified AES context. * * \param ctx The AES context to clear. */ void mbedtls_aes_free( mbedtls_aes_context *ctx ); /** * \brief This function sets the encryption key. * * \param ctx The AES context to which the key should be bound. * \param key The encryption key. * \param keybits The size of data passed in bits. Valid options are: * * * \return \c 0 on success or #MBEDTLS_ERR_AES_INVALID_KEY_LENGTH * on failure. */ int mbedtls_aes_setkey_enc( mbedtls_aes_context *ctx, const unsigned char *key, unsigned int keybits ); /** * \brief This function sets the decryption key. * * \param ctx The AES context to which the key should be bound. * \param key The decryption key. * \param keybits The size of data passed. Valid options are: * * * \return \c 0 on success, or #MBEDTLS_ERR_AES_INVALID_KEY_LENGTH on failure. */ int mbedtls_aes_setkey_dec( mbedtls_aes_context *ctx, const unsigned char *key, unsigned int keybits ); /** * \brief This function performs an AES single-block encryption or * decryption operation. * * It performs the operation defined in the \p mode parameter * (encrypt or decrypt), on the input data buffer defined in * the \p input parameter. * * mbedtls_aes_init(), and either mbedtls_aes_setkey_enc() or * mbedtls_aes_setkey_dec() must be called before the first * call to this API with the same context. * * \param ctx The AES context to use for encryption or decryption. * \param mode The AES operation: #MBEDTLS_AES_ENCRYPT or * #MBEDTLS_AES_DECRYPT. * \param input The 16-Byte buffer holding the input data. * \param output The 16-Byte buffer holding the output data. * \return \c 0 on success. */ int mbedtls_aes_crypt_ecb( mbedtls_aes_context *ctx, int mode, const unsigned char input[16], unsigned char output[16] ); #if defined(MBEDTLS_CIPHER_MODE_CBC) /** * \brief This function performs an AES-CBC encryption or decryption operation * on full blocks. * * It performs the operation defined in the \p mode * parameter (encrypt/decrypt), on the input data buffer defined in * the \p input parameter. * * It can be called as many times as needed, until all the input * data is processed. mbedtls_aes_init(), and either * mbedtls_aes_setkey_enc() or mbedtls_aes_setkey_dec() must be called * before the first call to this API with the same context. * * \note This function operates on aligned blocks, that is, the input size * must be a multiple of the AES block size of 16 Bytes. * * \note Upon exit, the content of the IV is updated so that you can * call the same function again on the next * block(s) of data and get the same result as if it was * encrypted in one call. This allows a "streaming" usage. * If you need to retain the contents of the IV, you should * either save it manually or use the cipher module instead. * * * \param ctx The AES context to use for encryption or decryption. * \param mode The AES operation: #MBEDTLS_AES_ENCRYPT or * #MBEDTLS_AES_DECRYPT. * \param length The length of the input data in Bytes. This must be a * multiple of the block size (16 Bytes). * \param iv Initialization vector (updated after use). * \param input The buffer holding the input data. * \param output The buffer holding the output data. * * \return \c 0 on success, or #MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH * on failure. */ int mbedtls_aes_crypt_cbc( mbedtls_aes_context *ctx, int mode, size_t length, unsigned char iv[16], const unsigned char *input, unsigned char *output ); #endif /* MBEDTLS_CIPHER_MODE_CBC */ #if defined(MBEDTLS_CIPHER_MODE_CFB) /** * \brief This function performs an AES-CFB128 encryption or decryption * operation. * * It performs the operation defined in the \p mode * parameter (encrypt or decrypt), on the input data buffer * defined in the \p input parameter. * * For CFB, you must set up the context with mbedtls_aes_setkey_enc(), * regardless of whether you are performing an encryption or decryption * operation, that is, regardless of the \p mode parameter. This is * because CFB mode uses the same key schedule for encryption and * decryption. * * \note Upon exit, the content of the IV is updated so that you can * call the same function again on the next * block(s) of data and get the same result as if it was * encrypted in one call. This allows a "streaming" usage. * If you need to retain the contents of the * IV, you must either save it manually or use the cipher * module instead. * * * \param ctx The AES context to use for encryption or decryption. * \param mode The AES operation: #MBEDTLS_AES_ENCRYPT or * #MBEDTLS_AES_DECRYPT. * \param length The length of the input data. * \param iv_off The offset in IV (updated after use). * \param iv The initialization vector (updated after use). * \param input The buffer holding the input data. * \param output The buffer holding the output data. * * \return \c 0 on success. */ int mbedtls_aes_crypt_cfb128( mbedtls_aes_context *ctx, int mode, size_t length, size_t *iv_off, unsigned char iv[16], const unsigned char *input, unsigned char *output ); /** * \brief This function performs an AES-CFB8 encryption or decryption * operation. * * It performs the operation defined in the \p mode * parameter (encrypt/decrypt), on the input data buffer defined * in the \p input parameter. * * Due to the nature of CFB, you must use the same key schedule for * both encryption and decryption operations. Therefore, you must * use the context initialized with mbedtls_aes_setkey_enc() for * both #MBEDTLS_AES_ENCRYPT and #MBEDTLS_AES_DECRYPT. * * \note Upon exit, the content of the IV is updated so that you can * call the same function again on the next * block(s) of data and get the same result as if it was * encrypted in one call. This allows a "streaming" usage. * If you need to retain the contents of the * IV, you should either save it manually or use the cipher * module instead. * * * \param ctx The AES context to use for encryption or decryption. * \param mode The AES operation: #MBEDTLS_AES_ENCRYPT or * #MBEDTLS_AES_DECRYPT * \param length The length of the input data. * \param iv The initialization vector (updated after use). * \param input The buffer holding the input data. * \param output The buffer holding the output data. * * \return \c 0 on success. */ int mbedtls_aes_crypt_cfb8( mbedtls_aes_context *ctx, int mode, size_t length, unsigned char iv[16], const unsigned char *input, unsigned char *output ); #endif /*MBEDTLS_CIPHER_MODE_CFB */ #if defined(MBEDTLS_CIPHER_MODE_CTR) /** * \brief This function performs an AES-CTR encryption or decryption * operation. * * This function performs the operation defined in the \p mode * parameter (encrypt/decrypt), on the input data buffer * defined in the \p input parameter. * * Due to the nature of CTR, you must use the same key schedule * for both encryption and decryption operations. Therefore, you * must use the context initialized with mbedtls_aes_setkey_enc() * for both #MBEDTLS_AES_ENCRYPT and #MBEDTLS_AES_DECRYPT. * * \warning You must keep the maximum use of your counter in mind. * * \param ctx The AES context to use for encryption or decryption. * \param length The length of the input data. * \param nc_off The offset in the current \p stream_block, for * resuming within the current cipher stream. The * offset pointer 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. This is * overwritten by the function. * \param input The buffer holding the input data. * \param output The buffer holding the output data. * * \return \c 0 on success. */ int mbedtls_aes_crypt_ctr( mbedtls_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 ); #endif /* MBEDTLS_CIPHER_MODE_CTR */ /** * \brief Internal AES block encryption function. This is only * exposed to allow overriding it using * \c MBEDTLS_AES_ENCRYPT_ALT. * * \param ctx The AES context to use for encryption. * \param input The plaintext block. * \param output The output (ciphertext) block. * * \return \c 0 on success. */ int mbedtls_internal_aes_encrypt( mbedtls_aes_context *ctx, const unsigned char input[16], unsigned char output[16] ); /** * \brief Internal AES block decryption function. This is only * exposed to allow overriding it using see * \c MBEDTLS_AES_DECRYPT_ALT. * * \param ctx The AES context to use for decryption. * \param input The ciphertext block. * \param output The output (plaintext) block. * * \return \c 0 on success. */ int mbedtls_internal_aes_decrypt( mbedtls_aes_context *ctx, const unsigned char input[16], unsigned char output[16] ); #if !defined(MBEDTLS_DEPRECATED_REMOVED) #if defined(MBEDTLS_DEPRECATED_WARNING) #define MBEDTLS_DEPRECATED __attribute__((deprecated)) #else #define MBEDTLS_DEPRECATED #endif /** * \brief Deprecated internal AES block encryption function * without return value. * * \deprecated Superseded by mbedtls_aes_encrypt_ext() in 2.5.0. * * \param ctx The AES context to use for encryption. * \param input Plaintext block. * \param output Output (ciphertext) block. */ MBEDTLS_DEPRECATED void mbedtls_aes_encrypt( mbedtls_aes_context *ctx, const unsigned char input[16], unsigned char output[16] ); /** * \brief Deprecated internal AES block decryption function * without return value. * * \deprecated Superseded by mbedtls_aes_decrypt_ext() in 2.5.0. * * \param ctx The AES context to use for decryption. * \param input Ciphertext block. * \param output Output (plaintext) block. */ MBEDTLS_DEPRECATED void mbedtls_aes_decrypt( mbedtls_aes_context *ctx, const unsigned char input[16], unsigned char output[16] ); #undef MBEDTLS_DEPRECATED #endif /* !MBEDTLS_DEPRECATED_REMOVED */ #ifdef __cplusplus } #endif #else /* MBEDTLS_AES_ALT */ #include "aes_alt.h" #endif /* MBEDTLS_AES_ALT */ #ifdef __cplusplus extern "C" { #endif /** * \brief Checkup routine. * * \return \c 0 on success, or \c 1 on failure. */ int mbedtls_aes_self_test( int verbose ); #ifdef __cplusplus } #endif #endif /* aes.h */