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# ========================
Signed-off-by: Bence Szépkúti <bence.szepkuti@arm.com>
370 lines
16 KiB
C
370 lines
16 KiB
C
/**
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* \file aria.h
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*
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* \brief ARIA block cipher
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*
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* The ARIA algorithm is a symmetric block cipher that can encrypt and
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* decrypt information. It is defined by the Korean Agency for
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* Technology and Standards (KATS) in <em>KS X 1213:2004</em> (in
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* Korean, but see http://210.104.33.10/ARIA/index-e.html in English)
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* and also described by the IETF in <em>RFC 5794</em>.
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*/
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/*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef MBEDTLS_ARIA_H
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#define MBEDTLS_ARIA_H
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "mbedtls/config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#include <stddef.h>
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#include <stdint.h>
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#include "mbedtls/platform_util.h"
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#define MBEDTLS_ARIA_ENCRYPT 1 /**< ARIA encryption. */
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#define MBEDTLS_ARIA_DECRYPT 0 /**< ARIA decryption. */
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#define MBEDTLS_ARIA_BLOCKSIZE 16 /**< ARIA block size in bytes. */
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#define MBEDTLS_ARIA_MAX_ROUNDS 16 /**< Maxiumum number of rounds in ARIA. */
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#define MBEDTLS_ARIA_MAX_KEYSIZE 32 /**< Maximum size of an ARIA key in bytes. */
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#if !defined(MBEDTLS_DEPRECATED_REMOVED)
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#define MBEDTLS_ERR_ARIA_INVALID_KEY_LENGTH MBEDTLS_DEPRECATED_NUMERIC_CONSTANT( -0x005C )
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#endif /* !MBEDTLS_DEPRECATED_REMOVED */
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#define MBEDTLS_ERR_ARIA_BAD_INPUT_DATA -0x005C /**< Bad input data. */
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#define MBEDTLS_ERR_ARIA_INVALID_INPUT_LENGTH -0x005E /**< Invalid data input length. */
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/* MBEDTLS_ERR_ARIA_FEATURE_UNAVAILABLE is deprecated and should not be used.
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*/
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#define MBEDTLS_ERR_ARIA_FEATURE_UNAVAILABLE -0x005A /**< Feature not available. For example, an unsupported ARIA key size. */
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/* MBEDTLS_ERR_ARIA_HW_ACCEL_FAILED is deprecated and should not be used. */
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#define MBEDTLS_ERR_ARIA_HW_ACCEL_FAILED -0x0058 /**< ARIA hardware accelerator failed. */
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#if !defined(MBEDTLS_ARIA_ALT)
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// Regular implementation
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//
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* \brief The ARIA context-type definition.
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*/
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typedef struct mbedtls_aria_context
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{
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unsigned char nr; /*!< The number of rounds (12, 14 or 16) */
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/*! The ARIA round keys. */
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uint32_t rk[MBEDTLS_ARIA_MAX_ROUNDS + 1][MBEDTLS_ARIA_BLOCKSIZE / 4];
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}
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mbedtls_aria_context;
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#else /* MBEDTLS_ARIA_ALT */
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#include "aria_alt.h"
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#endif /* MBEDTLS_ARIA_ALT */
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/**
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* \brief This function initializes the specified ARIA context.
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*
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* It must be the first API called before using
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* the context.
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*
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* \param ctx The ARIA context to initialize. This must not be \c NULL.
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*/
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void mbedtls_aria_init( mbedtls_aria_context *ctx );
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/**
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* \brief This function releases and clears the specified ARIA context.
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*
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* \param ctx The ARIA context to clear. This may be \c NULL, in which
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* case this function returns immediately. If it is not \c NULL,
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* it must point to an initialized ARIA context.
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*/
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void mbedtls_aria_free( mbedtls_aria_context *ctx );
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/**
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* \brief This function sets the encryption key.
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*
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* \param ctx The ARIA context to which the key should be bound.
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* This must be initialized.
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* \param key The encryption key. This must be a readable buffer
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* of size \p keybits Bits.
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* \param keybits The size of \p key in Bits. Valid options are:
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* <ul><li>128 bits</li>
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* <li>192 bits</li>
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* <li>256 bits</li></ul>
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*
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* \return \c 0 on success.
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* \return A negative error code on failure.
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*/
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int mbedtls_aria_setkey_enc( mbedtls_aria_context *ctx,
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const unsigned char *key,
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unsigned int keybits );
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/**
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* \brief This function sets the decryption key.
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*
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* \param ctx The ARIA context to which the key should be bound.
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* This must be initialized.
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* \param key The decryption key. This must be a readable buffer
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* of size \p keybits Bits.
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* \param keybits The size of data passed. Valid options are:
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* <ul><li>128 bits</li>
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* <li>192 bits</li>
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* <li>256 bits</li></ul>
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*
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* \return \c 0 on success.
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* \return A negative error code on failure.
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*/
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int mbedtls_aria_setkey_dec( mbedtls_aria_context *ctx,
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const unsigned char *key,
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unsigned int keybits );
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/**
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* \brief This function performs an ARIA single-block encryption or
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* decryption operation.
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*
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* It performs encryption or decryption (depending on whether
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* the key was set for encryption on decryption) on the input
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* data buffer defined in the \p input parameter.
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*
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* mbedtls_aria_init(), and either mbedtls_aria_setkey_enc() or
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* mbedtls_aria_setkey_dec() must be called before the first
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* call to this API with the same context.
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*
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* \param ctx The ARIA context to use for encryption or decryption.
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* This must be initialized and bound to a key.
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* \param input The 16-Byte buffer holding the input data.
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* \param output The 16-Byte buffer holding the output data.
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* \return \c 0 on success.
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* \return A negative error code on failure.
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*/
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int mbedtls_aria_crypt_ecb( mbedtls_aria_context *ctx,
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const unsigned char input[MBEDTLS_ARIA_BLOCKSIZE],
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unsigned char output[MBEDTLS_ARIA_BLOCKSIZE] );
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#if defined(MBEDTLS_CIPHER_MODE_CBC)
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/**
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* \brief This function performs an ARIA-CBC encryption or decryption operation
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* on full blocks.
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*
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* It performs the operation defined in the \p mode
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* parameter (encrypt/decrypt), on the input data buffer defined in
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* the \p input parameter.
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*
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* It can be called as many times as needed, until all the input
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* data is processed. mbedtls_aria_init(), and either
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* mbedtls_aria_setkey_enc() or mbedtls_aria_setkey_dec() must be called
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* before the first call to this API with the same context.
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*
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* \note This function operates on aligned blocks, that is, the input size
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* must be a multiple of the ARIA block size of 16 Bytes.
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*
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* \note Upon exit, the content of the IV is updated so that you can
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* call the same function again on the next
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* block(s) of data and get the same result as if it was
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* encrypted in one call. This allows a "streaming" usage.
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* If you need to retain the contents of the IV, you should
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* either save it manually or use the cipher module instead.
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*
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*
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* \param ctx The ARIA context to use for encryption or decryption.
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* This must be initialized and bound to a key.
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* \param mode The mode of operation. This must be either
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* #MBEDTLS_ARIA_ENCRYPT for encryption, or
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* #MBEDTLS_ARIA_DECRYPT for decryption.
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* \param length The length of the input data in Bytes. This must be a
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* multiple of the block size (16 Bytes).
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* \param iv Initialization vector (updated after use).
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* This must be a readable buffer of size 16 Bytes.
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* \param input The buffer holding the input data. This must
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* be a readable buffer of length \p length Bytes.
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* \param output The buffer holding the output data. This must
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* be a writable buffer of length \p length Bytes.
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*
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* \return \c 0 on success.
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* \return A negative error code on failure.
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*/
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int mbedtls_aria_crypt_cbc( mbedtls_aria_context *ctx,
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int mode,
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size_t length,
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unsigned char iv[MBEDTLS_ARIA_BLOCKSIZE],
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const unsigned char *input,
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unsigned char *output );
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#endif /* MBEDTLS_CIPHER_MODE_CBC */
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#if defined(MBEDTLS_CIPHER_MODE_CFB)
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/**
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* \brief This function performs an ARIA-CFB128 encryption or decryption
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* operation.
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*
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* It performs the operation defined in the \p mode
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* parameter (encrypt or decrypt), on the input data buffer
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* defined in the \p input parameter.
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*
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* For CFB, you must set up the context with mbedtls_aria_setkey_enc(),
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* regardless of whether you are performing an encryption or decryption
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* operation, that is, regardless of the \p mode parameter. This is
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* because CFB mode uses the same key schedule for encryption and
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* decryption.
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*
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* \note Upon exit, the content of the IV is updated so that you can
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* call the same function again on the next
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* block(s) of data and get the same result as if it was
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* encrypted in one call. This allows a "streaming" usage.
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* If you need to retain the contents of the
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* IV, you must either save it manually or use the cipher
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* module instead.
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*
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*
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* \param ctx The ARIA context to use for encryption or decryption.
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* This must be initialized and bound to a key.
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* \param mode The mode of operation. This must be either
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* #MBEDTLS_ARIA_ENCRYPT for encryption, or
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* #MBEDTLS_ARIA_DECRYPT for decryption.
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* \param length The length of the input data \p input in Bytes.
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* \param iv_off The offset in IV (updated after use).
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* This must not be larger than 15.
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* \param iv The initialization vector (updated after use).
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* This must be a readable buffer of size 16 Bytes.
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* \param input The buffer holding the input data. This must
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* be a readable buffer of length \p length Bytes.
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* \param output The buffer holding the output data. This must
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* be a writable buffer of length \p length Bytes.
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*
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* \return \c 0 on success.
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* \return A negative error code on failure.
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*/
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int mbedtls_aria_crypt_cfb128( mbedtls_aria_context *ctx,
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int mode,
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size_t length,
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size_t *iv_off,
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unsigned char iv[MBEDTLS_ARIA_BLOCKSIZE],
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const unsigned char *input,
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unsigned char *output );
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#endif /* MBEDTLS_CIPHER_MODE_CFB */
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#if defined(MBEDTLS_CIPHER_MODE_CTR)
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/**
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* \brief This function performs an ARIA-CTR encryption or decryption
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* operation.
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*
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* This function performs the operation defined in the \p mode
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* parameter (encrypt/decrypt), on the input data buffer
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* defined in the \p input parameter.
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*
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* Due to the nature of CTR, you must use the same key schedule
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* for both encryption and decryption operations. Therefore, you
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* must use the context initialized with mbedtls_aria_setkey_enc()
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* for both #MBEDTLS_ARIA_ENCRYPT and #MBEDTLS_ARIA_DECRYPT.
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*
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* \warning You must never reuse a nonce value with the same key. Doing so
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* would void the encryption for the two messages encrypted with
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* the same nonce and key.
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*
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* There are two common strategies for managing nonces with CTR:
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*
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* 1. You can handle everything as a single message processed over
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* successive calls to this function. In that case, you want to
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* set \p nonce_counter and \p nc_off to 0 for the first call, and
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* then preserve the values of \p nonce_counter, \p nc_off and \p
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* stream_block across calls to this function as they will be
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* updated by this function.
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*
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* With this strategy, you must not encrypt more than 2**128
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* blocks of data with the same key.
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*
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* 2. You can encrypt separate messages by dividing the \p
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* nonce_counter buffer in two areas: the first one used for a
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* per-message nonce, handled by yourself, and the second one
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* updated by this function internally.
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*
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* For example, you might reserve the first 12 bytes for the
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* per-message nonce, and the last 4 bytes for internal use. In that
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* case, before calling this function on a new message you need to
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* set the first 12 bytes of \p nonce_counter to your chosen nonce
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* value, the last 4 to 0, and \p nc_off to 0 (which will cause \p
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* stream_block to be ignored). That way, you can encrypt at most
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* 2**96 messages of up to 2**32 blocks each with the same key.
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*
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* The per-message nonce (or information sufficient to reconstruct
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* it) needs to be communicated with the ciphertext and must be unique.
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* The recommended way to ensure uniqueness is to use a message
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* counter. An alternative is to generate random nonces, but this
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* limits the number of messages that can be securely encrypted:
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* for example, with 96-bit random nonces, you should not encrypt
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* more than 2**32 messages with the same key.
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*
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* Note that for both stategies, sizes are measured in blocks and
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* that an ARIA block is 16 bytes.
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*
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* \warning Upon return, \p stream_block contains sensitive data. Its
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* content must not be written to insecure storage and should be
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* securely discarded as soon as it's no longer needed.
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*
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* \param ctx The ARIA context to use for encryption or decryption.
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* This must be initialized and bound to a key.
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* \param length The length of the input data \p input in Bytes.
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* \param nc_off The offset in Bytes in the current \p stream_block,
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* for resuming within the current cipher stream. The
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* offset pointer should be \c 0 at the start of a
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* stream. This must not be larger than \c 15 Bytes.
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* \param nonce_counter The 128-bit nonce and counter. This must point to
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* a read/write buffer of length \c 16 bytes.
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* \param stream_block The saved stream block for resuming. This must
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* point to a read/write buffer of length \c 16 bytes.
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* This is overwritten by the function.
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* \param input The buffer holding the input data. This must
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* be a readable buffer of length \p length Bytes.
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* \param output The buffer holding the output data. This must
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* be a writable buffer of length \p length Bytes.
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*
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* \return \c 0 on success.
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* \return A negative error code on failure.
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*/
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int mbedtls_aria_crypt_ctr( mbedtls_aria_context *ctx,
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size_t length,
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size_t *nc_off,
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unsigned char nonce_counter[MBEDTLS_ARIA_BLOCKSIZE],
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unsigned char stream_block[MBEDTLS_ARIA_BLOCKSIZE],
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const unsigned char *input,
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unsigned char *output );
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#endif /* MBEDTLS_CIPHER_MODE_CTR */
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#if defined(MBEDTLS_SELF_TEST)
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/**
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* \brief Checkup routine.
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*
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* \return \c 0 on success, or \c 1 on failure.
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*/
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int mbedtls_aria_self_test( int verbose );
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#endif /* MBEDTLS_SELF_TEST */
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#ifdef __cplusplus
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}
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#endif
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#endif /* aria.h */
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