EIC code displayed by LXR master/​include/​mbedtls/​aes.h	Source navigation Diff markup Identifier search General search
	Version: master test Revert   Change

File indexing completed on 2025-08-27 09:37:29

 /**
  * \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 OR GPL-2.0-or-later
  */
 
 #ifndef MBEDTLS_AES_H
 #define MBEDTLS_AES_H
 #include "mbedtls/private_access.h"
 
 #include "mbedtls/build_info.h"
 #include "mbedtls/platform_util.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 */
 /** Invalid key length. */
 #define MBEDTLS_ERR_AES_INVALID_KEY_LENGTH                -0x0020
 /** Invalid data input length. */
 #define MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH              -0x0022
 
 /* Error codes in range 0x0021-0x0025 */
 /** Invalid input data. */
 #define MBEDTLS_ERR_AES_BAD_INPUT_DATA                    -0x0021
 
 #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. */
     size_t MBEDTLS_PRIVATE(rk_offset);           /*!< The offset in array elements to AES
                                                     round keys in the buffer. */
 #if defined(MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH) && !defined(MBEDTLS_PADLOCK_C)
     uint32_t MBEDTLS_PRIVATE(buf)[44];           /*!< Aligned data buffer to hold
                                                     10 round keys for 128-bit case. */
 #else
     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> */
 #endif /* MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH && !MBEDTLS_PADLOCK_C */
 }
 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.
  */
 MBEDTLS_CHECK_RETURN_TYPICAL
 int mbedtls_aes_setkey_enc(mbedtls_aes_context *ctx, const unsigned char *key,
                            unsigned int keybits);
 
 #if !defined(MBEDTLS_BLOCK_CIPHER_NO_DECRYPT)
 /**
  * \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.
  */
 MBEDTLS_CHECK_RETURN_TYPICAL
 int mbedtls_aes_setkey_dec(mbedtls_aes_context *ctx, const unsigned char *key,
                            unsigned int keybits);
 #endif /* !MBEDTLS_BLOCK_CIPHER_NO_DECRYPT */
 
 #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.
  */
 MBEDTLS_CHECK_RETURN_TYPICAL
 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.
  */
 MBEDTLS_CHECK_RETURN_TYPICAL
 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.
  */
 MBEDTLS_CHECK_RETURN_TYPICAL
 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.
  */
 MBEDTLS_CHECK_RETURN_TYPICAL
 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).
  */
 MBEDTLS_CHECK_RETURN_TYPICAL
 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.
  */
 MBEDTLS_CHECK_RETURN_TYPICAL
 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.
  */
 MBEDTLS_CHECK_RETURN_TYPICAL
 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.
  */
 MBEDTLS_CHECK_RETURN_TYPICAL
 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.
  *
  *             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 strategies, 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.
  */
 MBEDTLS_CHECK_RETURN_TYPICAL
 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.
  */
 MBEDTLS_CHECK_RETURN_TYPICAL
 int mbedtls_internal_aes_encrypt(mbedtls_aes_context *ctx,
                                  const unsigned char input[16],
                                  unsigned char output[16]);
 
 #if !defined(MBEDTLS_BLOCK_CIPHER_NO_DECRYPT)
 /**
  * \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.
  */
 MBEDTLS_CHECK_RETURN_TYPICAL
 int mbedtls_internal_aes_decrypt(mbedtls_aes_context *ctx,
                                  const unsigned char input[16],
                                  unsigned char output[16]);
 #endif /* !MBEDTLS_BLOCK_CIPHER_NO_DECRYPT */
 
 #if defined(MBEDTLS_SELF_TEST)
 /**
  * \brief          Checkup routine.
  *
  * \return         \c 0 on success.
  * \return         \c 1 on failure.
  */
 MBEDTLS_CHECK_RETURN_CRITICAL
 int mbedtls_aes_self_test(int verbose);
 
 #endif /* MBEDTLS_SELF_TEST */
 
 #ifdef __cplusplus
 }
 #endif
 
 #endif /* aes.h */

This page was automatically generated by the 2.3.7 LXR engine. The LXR team