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Diffstat (limited to 'include/mbedtls/aes.h')
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diff --git a/include/mbedtls/aes.h b/include/mbedtls/aes.h deleted file mode 100644 index 77ecffd..0000000 --- a/include/mbedtls/aes.h +++ /dev/null @@ -1,627 +0,0 @@ -/** - * \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); - -/** - * \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); - -#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]); - -/** - * \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]); - -#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 */ |