| /** |
| * \file aes.h |
| * |
| * \brief This file contains AES definitions and functions. |
| * |
| * 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 |
| * <em>FIPS Publication 197: Advanced Encryption Standard</em> and |
| * <em>ISO/IEC 18033-2:2006: Information technology -- Security |
| * techniques -- Encryption algorithms -- Part 2: Asymmetric |
| * ciphers</em>. |
| * |
| * The AES-XTS block mode is standardized by NIST SP 800-38E |
| * <https://nvlpubs.nist.gov/nistpubs/legacy/sp/nistspecialpublication800-38e.pdf> |
| * and described in detail by IEEE P1619 |
| * <https://ieeexplore.ieee.org/servlet/opac?punumber=4375278>. |
| */ |
| |
| /* |
| * Copyright The Mbed TLS Contributors |
| * 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. |
| */ |
| |
| #ifndef MBEDTLS_AES_H |
| #define MBEDTLS_AES_H |
| #include "mbedtls/private_access.h" |
| |
| #include "mbedtls/build_info.h" |
| |
| #include <stddef.h> |
| #include <stdint.h> |
| |
| /* 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 0x0021-0x0025 */ |
| #define MBEDTLS_ERR_AES_BAD_INPUT_DATA -0x0021 /**< Invalid input data. */ |
| |
| #if ( defined(__ARMCC_VERSION) || defined(_MSC_VER) ) && \ |
| !defined(inline) && !defined(__cplusplus) |
| #define inline __inline |
| #endif |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| #if !defined(MBEDTLS_AES_ALT) |
| // Regular implementation |
| // |
| |
| /** |
| * \brief The AES context-type definition. |
| */ |
| typedef struct mbedtls_aes_context |
| { |
| int MBEDTLS_PRIVATE(nr); /*!< The number of rounds. */ |
| uint32_t *MBEDTLS_PRIVATE(rk); /*!< AES round keys. */ |
| uint32_t MBEDTLS_PRIVATE(buf)[68]; /*!< Unaligned data buffer. This buffer can |
| hold 32 extra Bytes, which can be used for |
| one of the following purposes: |
| <ul><li>Alignment if VIA padlock is |
| used.</li> |
| <li>Simplifying key expansion in the 256-bit |
| case by generating an extra round key. |
| </li></ul> */ |
| } |
| mbedtls_aes_context; |
| |
| #if defined(MBEDTLS_CIPHER_MODE_XTS) |
| /** |
| * \brief The AES XTS context-type definition. |
| */ |
| typedef struct mbedtls_aes_xts_context |
| { |
| mbedtls_aes_context MBEDTLS_PRIVATE(crypt); /*!< The AES context to use for AES block |
| encryption or decryption. */ |
| mbedtls_aes_context MBEDTLS_PRIVATE(tweak); /*!< The AES context used for tweak |
| computation. */ |
| } mbedtls_aes_xts_context; |
| #endif /* MBEDTLS_CIPHER_MODE_XTS */ |
| |
| #else /* MBEDTLS_AES_ALT */ |
| #include "aes_alt.h" |
| #endif /* MBEDTLS_AES_ALT */ |
| |
| /** |
| * \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. This must not be \c NULL. |
| */ |
| 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. |
| * If this is \c NULL, this function does nothing. |
| * Otherwise, the context must have been at least initialized. |
| */ |
| void mbedtls_aes_free( mbedtls_aes_context *ctx ); |
| |
| #if defined(MBEDTLS_CIPHER_MODE_XTS) |
| /** |
| * \brief This function initializes the specified AES XTS context. |
| * |
| * It must be the first API called before using |
| * the context. |
| * |
| * \param ctx The AES XTS context to initialize. This must not be \c NULL. |
| */ |
| void mbedtls_aes_xts_init( mbedtls_aes_xts_context *ctx ); |
| |
| /** |
| * \brief This function releases and clears the specified AES XTS context. |
| * |
| * \param ctx The AES XTS context to clear. |
| * If this is \c NULL, this function does nothing. |
| * Otherwise, the context must have been at least initialized. |
| */ |
| void mbedtls_aes_xts_free( mbedtls_aes_xts_context *ctx ); |
| #endif /* MBEDTLS_CIPHER_MODE_XTS */ |
| |
| /** |
| * \brief This function sets the encryption key. |
| * |
| * \param ctx The AES context to which the key should be bound. |
| * It must be initialized. |
| * \param key The encryption key. |
| * This must be a readable buffer of size \p keybits bits. |
| * \param keybits The size of data passed in bits. Valid options are: |
| * <ul><li>128 bits</li> |
| * <li>192 bits</li> |
| * <li>256 bits</li></ul> |
| * |
| * \return \c 0 on success. |
| * \return #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. |
| * It must be initialized. |
| * \param key The decryption key. |
| * This must be a readable buffer of size \p keybits bits. |
| * \param keybits The size of data passed. Valid options are: |
| * <ul><li>128 bits</li> |
| * <li>192 bits</li> |
| * <li>256 bits</li></ul> |
| * |
| * \return \c 0 on success. |
| * \return #MBEDTLS_ERR_AES_INVALID_KEY_LENGTH on failure. |
| */ |
| int mbedtls_aes_setkey_dec( mbedtls_aes_context *ctx, const unsigned char *key, |
| unsigned int keybits ); |
| |
| #if defined(MBEDTLS_CIPHER_MODE_XTS) |
| /** |
| * \brief This function prepares an XTS context for encryption and |
| * sets the encryption key. |
| * |
| * \param ctx The AES XTS context to which the key should be bound. |
| * It must be initialized. |
| * \param key The encryption key. This is comprised of the XTS key1 |
| * concatenated with the XTS key2. |
| * This must be a readable buffer of size \p keybits bits. |
| * \param keybits The size of \p key passed in bits. Valid options are: |
| * <ul><li>256 bits (each of key1 and key2 is a 128-bit key)</li> |
| * <li>512 bits (each of key1 and key2 is a 256-bit key)</li></ul> |
| * |
| * \return \c 0 on success. |
| * \return #MBEDTLS_ERR_AES_INVALID_KEY_LENGTH on failure. |
| */ |
| int mbedtls_aes_xts_setkey_enc( mbedtls_aes_xts_context *ctx, |
| const unsigned char *key, |
| unsigned int keybits ); |
| |
| /** |
| * \brief This function prepares an XTS context for decryption and |
| * sets the decryption key. |
| * |
| * \param ctx The AES XTS context to which the key should be bound. |
| * It must be initialized. |
| * \param key The decryption key. This is comprised of the XTS key1 |
| * concatenated with the XTS key2. |
| * This must be a readable buffer of size \p keybits bits. |
| * \param keybits The size of \p key passed in bits. Valid options are: |
| * <ul><li>256 bits (each of key1 and key2 is a 128-bit key)</li> |
| * <li>512 bits (each of key1 and key2 is a 256-bit key)</li></ul> |
| * |
| * \return \c 0 on success. |
| * \return #MBEDTLS_ERR_AES_INVALID_KEY_LENGTH on failure. |
| */ |
| int mbedtls_aes_xts_setkey_dec( mbedtls_aes_xts_context *ctx, |
| const unsigned char *key, |
| unsigned int keybits ); |
| #endif /* MBEDTLS_CIPHER_MODE_XTS */ |
| |
| /** |
| * \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. |
| * It must be initialized and bound to a key. |
| * \param mode The AES operation: #MBEDTLS_AES_ENCRYPT or |
| * #MBEDTLS_AES_DECRYPT. |
| * \param input The buffer holding the input data. |
| * It must be readable and at least \c 16 Bytes long. |
| * \param output The buffer where the output data will be written. |
| * It must be writeable and at least \c 16 Bytes long. |
| |
| * \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 full blocks, that is, the input size |
| * must be a multiple of the AES block size of \c 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. |
| * It must be initialized and bound to a key. |
| * \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 (\c 16 Bytes). |
| * \param iv Initialization vector (updated after use). |
| * It must be a readable and writeable buffer of \c 16 Bytes. |
| * \param input The buffer holding the input data. |
| * It must be readable and of size \p length Bytes. |
| * \param output The buffer holding the output data. |
| * It must be writeable and of size \p length Bytes. |
| * |
| * \return \c 0 on success. |
| * \return #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_XTS) |
| /** |
| * \brief This function performs an AES-XTS encryption or decryption |
| * operation for an entire XTS data unit. |
| * |
| * AES-XTS encrypts or decrypts blocks based on their location as |
| * defined by a data unit number. The data unit number must be |
| * provided by \p data_unit. |
| * |
| * NIST SP 800-38E limits the maximum size of a data unit to 2^20 |
| * AES blocks. If the data unit is larger than this, this function |
| * returns #MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH. |
| * |
| * \param ctx The AES XTS context to use for AES XTS operations. |
| * It must be initialized and bound to a key. |
| * \param mode The AES operation: #MBEDTLS_AES_ENCRYPT or |
| * #MBEDTLS_AES_DECRYPT. |
| * \param length The length of a data unit in Bytes. This can be any |
| * length between 16 bytes and 2^24 bytes inclusive |
| * (between 1 and 2^20 block cipher blocks). |
| * \param data_unit The address of the data unit encoded as an array of 16 |
| * bytes in little-endian format. For disk encryption, this |
| * is typically the index of the block device sector that |
| * contains the data. |
| * \param input The buffer holding the input data (which is an entire |
| * data unit). This function reads \p length Bytes from \p |
| * input. |
| * \param output The buffer holding the output data (which is an entire |
| * data unit). This function writes \p length Bytes to \p |
| * output. |
| * |
| * \return \c 0 on success. |
| * \return #MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH if \p length is |
| * smaller than an AES block in size (16 Bytes) or if \p |
| * length is larger than 2^20 blocks (16 MiB). |
| */ |
| int mbedtls_aes_crypt_xts( mbedtls_aes_xts_context *ctx, |
| int mode, |
| size_t length, |
| const unsigned char data_unit[16], |
| const unsigned char *input, |
| unsigned char *output ); |
| #endif /* MBEDTLS_CIPHER_MODE_XTS */ |
| |
| #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. |
| * It must be initialized and bound to a key. |
| * \param mode The AES operation: #MBEDTLS_AES_ENCRYPT or |
| * #MBEDTLS_AES_DECRYPT. |
| * \param length The length of the input data in Bytes. |
| * \param iv_off The offset in IV (updated after use). |
| * It must point to a valid \c size_t. |
| * \param iv The initialization vector (updated after use). |
| * It must be a readable and writeable buffer of \c 16 Bytes. |
| * \param input The buffer holding the input data. |
| * It must be readable and of size \p length Bytes. |
| * \param output The buffer holding the output data. |
| * It must be writeable and of size \p length Bytes. |
| * |
| * \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. |
| * It must be initialized and bound to a key. |
| * \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). |
| * It must be a readable and writeable buffer of \c 16 Bytes. |
| * \param input The buffer holding the input data. |
| * It must be readable and of size \p length Bytes. |
| * \param output The buffer holding the output data. |
| * It must be writeable and of size \p length Bytes. |
| * |
| * \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_OFB) |
| /** |
| * \brief This function performs an AES-OFB (Output Feedback Mode) |
| * encryption or decryption operation. |
| * |
| * For OFB, you must set up the context with |
| * mbedtls_aes_setkey_enc(), regardless of whether you are |
| * performing an encryption or decryption operation. This is |
| * because OFB mode uses the same key schedule for encryption and |
| * decryption. |
| * |
| * The OFB operation is identical for encryption or decryption, |
| * therefore no operation mode needs to be specified. |
| * |
| * \note Upon exit, the content of iv, the Initialisation Vector, 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, by initialising |
| * iv_off to 0 before the first call, and preserving its value |
| * between calls. |
| * |
| * For non-streaming use, the iv should be initialised on each call |
| * to a unique value, and iv_off set to 0 on each call. |
| * |
| * If you need to retain the contents of the initialisation vector, |
| * you must either save it manually or use the cipher module |
| * instead. |
| * |
| * \warning For the OFB mode, the initialisation vector must be unique |
| * every encryption operation. Reuse of an initialisation vector |
| * will compromise security. |
| * |
| * \param ctx The AES context to use for encryption or decryption. |
| * It must be initialized and bound to a key. |
| * \param length The length of the input data. |
| * \param iv_off The offset in IV (updated after use). |
| * It must point to a valid \c size_t. |
| * \param iv The initialization vector (updated after use). |
| * It must be a readable and writeable buffer of \c 16 Bytes. |
| * \param input The buffer holding the input data. |
| * It must be readable and of size \p length Bytes. |
| * \param output The buffer holding the output data. |
| * It must be writeable and of size \p length Bytes. |
| * |
| * \return \c 0 on success. |
| */ |
| int mbedtls_aes_crypt_ofb( mbedtls_aes_context *ctx, |
| size_t length, |
| size_t *iv_off, |
| unsigned char iv[16], |
| const unsigned char *input, |
| unsigned char *output ); |
| |
| #endif /* MBEDTLS_CIPHER_MODE_OFB */ |
| |
| #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 never reuse a nonce value with the same key. Doing so |
| * would void the encryption for the two messages encrypted with |
| * the same nonce and key. |
| * |
| * There are two common strategies for managing nonces with CTR: |
| * |
| * 1. You can handle everything as a single message processed over |
| * successive calls to this function. In that case, you want to |
| * set \p nonce_counter and \p nc_off to 0 for the first call, and |
| * then preserve the values of \p nonce_counter, \p nc_off and \p |
| * stream_block across calls to this function as they will be |
| * updated by this function. |
| * |
| * With this strategy, you must not encrypt more than 2**128 |
| * blocks of data with the same key. |
| * |
| * 2. You can encrypt separate messages by dividing the \p |
| * nonce_counter buffer in two areas: the first one used for a |
| * per-message nonce, handled by yourself, and the second one |
| * updated by this function internally. |
| * |
| * For example, you might reserve the first 12 bytes for the |
| * per-message nonce, and the last 4 bytes for internal use. In that |
| * case, before calling this function on a new message you need to |
| * set the first 12 bytes of \p nonce_counter to your chosen nonce |
| * value, the last 4 to 0, and \p nc_off to 0 (which will cause \p |
| * stream_block to be ignored). That way, you can encrypt at most |
| * 2**96 messages of up to 2**32 blocks each with the same key. |
| * |
| * The per-message nonce (or information sufficient to reconstruct |
| * it) needs to be communicated with the ciphertext and must be unique. |
| * The recommended way to ensure uniqueness is to use a message |
| * counter. An alternative is to generate random nonces, but this |
| * limits the number of messages that can be securely encrypted: |
| * for example, with 96-bit random nonces, you should not encrypt |
| * more than 2**32 messages with the same key. |
| * |
| * Note that for both stategies, sizes are measured in blocks and |
| * that an AES block is 16 bytes. |
| * |
| * \warning Upon return, \p stream_block contains sensitive data. Its |
| * content must not be written to insecure storage and should be |
| * securely discarded as soon as it's no longer needed. |
| * |
| * \param ctx The AES context to use for encryption or decryption. |
| * It must be initialized and bound to a key. |
| * \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. |
| * It must point to a valid \c size_t. |
| * \param nonce_counter The 128-bit nonce and counter. |
| * It must be a readable-writeable buffer of \c 16 Bytes. |
| * \param stream_block The saved stream block for resuming. This is |
| * overwritten by the function. |
| * It must be a readable-writeable buffer of \c 16 Bytes. |
| * \param input The buffer holding the input data. |
| * It must be readable and of size \p length Bytes. |
| * \param output The buffer holding the output data. |
| * It must be writeable and of size \p length Bytes. |
| * |
| * \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_SELF_TEST) |
| /** |
| * \brief Checkup routine. |
| * |
| * \return \c 0 on success. |
| * \return \c 1 on failure. |
| */ |
| int mbedtls_aes_self_test( int verbose ); |
| |
| #endif /* MBEDTLS_SELF_TEST */ |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* aes.h */ |
