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+/**
+ * \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
+ * FIPS Publication 197: Advanced Encryption Standard and
+ * ISO/IEC 18033-2:2006: Information technology -- Security
+ * techniques -- Encryption algorithms -- Part 2: Asymmetric
+ * ciphers.
+ *
+ * The AES-XTS block mode is standardized by NIST SP 800-38E
+ *
+ * and described in detail by IEEE P1619
+ * .
+ */
+
+/* Copyright (C) 2006-2018, Arm Limited (or its affiliates), All Rights Reserved.
+ * SPDX-License-Identifier: GPL-2.0
+ *
+ * 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.
+ *
+ * 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 0x0021-0x0025 */
+#define MBEDTLS_ERR_AES_BAD_INPUT_DATA -0x0021 /**< Invalid input data. */
+#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
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if !defined(MBEDTLS_AES_ALT)
+// Regular implementation
+//
+
+/**
+ * \brief The AES context-type definition.
+ */
+typedef struct mbedtls_aes_context
+{
+ 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:
+ - Alignment if VIA padlock is
+ used.
+ - Simplifying key expansion in the 256-bit
+ case by generating an extra round key.
+
*/
+}
+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 crypt; /*!< The AES context to use for AES block
+ encryption or decryption. */
+ mbedtls_aes_context 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.
+ */
+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 );
+
+#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.
+ */
+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.
+ */
+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.
+ * \param key The encryption key.
+ * \param keybits The size of data passed in bits. Valid options are:
+ * - 128 bits
+ * - 192 bits
+ * - 256 bits
+ *
+ * \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.
+ * \param key The decryption key.
+ * \param keybits The size of data passed. Valid options are:
+ * - 128 bits
+ * - 192 bits
+ * - 256 bits
+ *
+ * \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.
+ * \param key The encryption key. This is comprised of the XTS key1
+ * concatenated with the XTS key2.
+ * \param keybits The size of \p key passed in bits. Valid options are:
+ * - 256 bits (each of key1 and key2 is a 128-bit key)
+ * - 512 bits (each of key1 and key2 is a 256-bit key)
+ *
+ * \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.
+ * \param key The decryption key. This is comprised of the XTS key1
+ * concatenated with the XTS key2.
+ * \param keybits The size of \p key passed in bits. Valid options are:
+ * - 256 bits (each of key1 and key2 is a 128-bit key)
+ * - 512 bits (each of key1 and key2 is a 256-bit key)
+ *
+ * \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.
+ * \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.
+ * \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.
+ * \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.
+ * \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_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.
+ * \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_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.
+ * \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 */
+
+/**
+ * \brief Checkup routine.
+ *
+ * \return \c 0 on success.
+ * \return \c 1 on failure.
+ */
+int mbedtls_aes_self_test( int verbose );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* aes.h */