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304 lines
13 KiB
C
304 lines
13 KiB
C
/**
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* \file camellia.h
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*
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* \brief Camellia block cipher
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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 OR GPL-2.0-or-later
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*/
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#ifndef MBEDTLS_CAMELLIA_H
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#define MBEDTLS_CAMELLIA_H
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#include "mbedtls/private_access.h"
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#include "mbedtls/build_info.h"
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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_CAMELLIA_ENCRYPT 1
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#define MBEDTLS_CAMELLIA_DECRYPT 0
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/** Bad input data. */
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#define MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA -0x0024
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/** Invalid data input length. */
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#define MBEDTLS_ERR_CAMELLIA_INVALID_INPUT_LENGTH -0x0026
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if !defined(MBEDTLS_CAMELLIA_ALT)
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// Regular implementation
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//
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/**
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* \brief CAMELLIA context structure
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*/
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typedef struct mbedtls_camellia_context {
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int MBEDTLS_PRIVATE(nr); /*!< number of rounds */
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uint32_t MBEDTLS_PRIVATE(rk)[68]; /*!< CAMELLIA round keys */
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}
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mbedtls_camellia_context;
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#else /* MBEDTLS_CAMELLIA_ALT */
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#include "camellia_alt.h"
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#endif /* MBEDTLS_CAMELLIA_ALT */
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/**
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* \brief Initialize a CAMELLIA context.
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*
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* \param ctx The CAMELLIA context to be initialized.
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* This must not be \c NULL.
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*/
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void mbedtls_camellia_init(mbedtls_camellia_context *ctx);
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/**
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* \brief Clear a CAMELLIA context.
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*
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* \param ctx The CAMELLIA context to be cleared. This may be \c NULL,
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* in which case this function returns immediately. If it is not
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* \c NULL, it must be initialized.
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*/
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void mbedtls_camellia_free(mbedtls_camellia_context *ctx);
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/**
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* \brief Perform a CAMELLIA key schedule operation for encryption.
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*
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* \param ctx The CAMELLIA context to use. This must be initialized.
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* \param key The encryption key to use. This must be a readable buffer
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* of size \p keybits Bits.
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* \param keybits The length of \p key in Bits. This must be either \c 128,
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* \c 192 or \c 256.
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*
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* \return \c 0 if successful.
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* \return A negative error code on failure.
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*/
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int mbedtls_camellia_setkey_enc(mbedtls_camellia_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 Perform a CAMELLIA key schedule operation for decryption.
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*
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* \param ctx The CAMELLIA context to use. 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 length of \p key in Bits. This must be either \c 128,
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* \c 192 or \c 256.
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*
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* \return \c 0 if successful.
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* \return A negative error code on failure.
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*/
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int mbedtls_camellia_setkey_dec(mbedtls_camellia_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 Perform a CAMELLIA-ECB block encryption/decryption operation.
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*
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* \param ctx The CAMELLIA context to use. This must be initialized
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* and bound to a key.
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* \param mode The mode of operation. This must be either
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* #MBEDTLS_CAMELLIA_ENCRYPT or #MBEDTLS_CAMELLIA_DECRYPT.
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* \param input The input block. This must be a readable buffer
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* of size \c 16 Bytes.
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* \param output The output block. This must be a writable buffer
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* of size \c 16 Bytes.
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*
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* \return \c 0 if successful.
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* \return A negative error code on failure.
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*/
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int mbedtls_camellia_crypt_ecb(mbedtls_camellia_context *ctx,
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int mode,
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const unsigned char input[16],
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unsigned char output[16]);
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#if defined(MBEDTLS_CIPHER_MODE_CBC)
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/**
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* \brief Perform a CAMELLIA-CBC buffer encryption/decryption operation.
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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 function same function again on the following
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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 on the other hand you need to retain the contents of the
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* IV, you should either save it manually or use the cipher
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* module instead.
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*
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* \param ctx The CAMELLIA context to use. This must be initialized
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* and bound to a key.
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* \param mode The mode of operation. This must be either
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* #MBEDTLS_CAMELLIA_ENCRYPT or #MBEDTLS_CAMELLIA_DECRYPT.
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* \param length The length in Bytes of the input data \p input.
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* This must be a multiple of \c 16 Bytes.
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* \param iv The initialization vector. This must be a read/write buffer
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* of length \c 16 Bytes. It is updated to allow streaming
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* use as explained above.
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* \param input The buffer holding the input data. This must point to a
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* readable buffer of length \p length Bytes.
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* \param output The buffer holding the output data. This must point to a
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* writable buffer of length \p length Bytes.
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*
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* \return \c 0 if successful.
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* \return A negative error code on failure.
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*/
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int mbedtls_camellia_crypt_cbc(mbedtls_camellia_context *ctx,
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int mode,
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size_t length,
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unsigned char iv[16],
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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 Perform a CAMELLIA-CFB128 buffer encryption/decryption
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* operation.
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*
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* \note Due to the nature of CFB mode, you should use the same
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* key for both encryption and decryption. In particular, calls
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* to this function should be preceded by a key-schedule via
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* mbedtls_camellia_setkey_enc() regardless of whether \p mode
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* is #MBEDTLS_CAMELLIA_ENCRYPT or #MBEDTLS_CAMELLIA_DECRYPT.
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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 function same function again on the following
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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 on the other hand you need to retain the contents of the
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* IV, you should either save it manually or use the cipher
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* module instead.
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*
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* \param ctx The CAMELLIA context to use. This must be initialized
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* and bound to a key.
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* \param mode The mode of operation. This must be either
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* #MBEDTLS_CAMELLIA_ENCRYPT or #MBEDTLS_CAMELLIA_DECRYPT.
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* \param length The length of the input data \p input. Any value is allowed.
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* \param iv_off The current offset in the IV. This must be smaller
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* than \c 16 Bytes. It is updated after this call to allow
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* the aforementioned streaming usage.
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* \param iv The initialization vector. This must be a read/write buffer
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* of length \c 16 Bytes. It is updated after this call to
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* allow the aforementioned streaming usage.
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* \param input The buffer holding the input data. This must be a readable
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* buffer of size \p length Bytes.
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* \param output The buffer to hold the output data. This must be a writable
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* buffer of length \p length Bytes.
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*
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* \return \c 0 if successful.
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* \return A negative error code on failure.
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*/
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int mbedtls_camellia_crypt_cfb128(mbedtls_camellia_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[16],
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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 Perform a CAMELLIA-CTR buffer encryption/decryption operation.
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*
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* *note Due to the nature of CTR mode, you should use the same
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* key for both encryption and decryption. In particular, calls
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* to this function should be preceded by a key-schedule via
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* mbedtls_camellia_setkey_enc() regardless of whether the mode
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* is #MBEDTLS_CAMELLIA_ENCRYPT or #MBEDTLS_CAMELLIA_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 \c 12 Bytes for the
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* per-message nonce, and the last \c 4 Bytes for internal use.
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* In that case, before calling this function on a new message you
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* need to set the first \c 12 Bytes of \p nonce_counter to your
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* chosen nonce value, the last four to \c 0, and \p nc_off to \c 0
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* (which will cause \p stream_block to be ignored). That way, you
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* can encrypt at most \c 2**96 messages of up to \c 2**32 blocks
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* 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
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* unique. The recommended way to ensure uniqueness is to use a
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* message counter. An alternative is to generate random nonces,
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* but this limits the number of messages that can be securely
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* encrypted: for example, with 96-bit random nonces, you should
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* not encrypt more than 2**32 messages with the same key.
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*
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* Note that for both strategies, sizes are measured in blocks and
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* that a CAMELLIA block is \c 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 CAMELLIA context to use. This must be initialized
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* 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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* Any value is allowed.
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* \param nc_off The offset in the current \p stream_block (for resuming
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* within current cipher stream). The offset pointer to
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* should be \c 0 at the start of a stream. It is updated
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* at the end of this call.
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* \param nonce_counter The 128-bit nonce and counter. This must be a read/write
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* buffer of length \c 16 Bytes.
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* \param stream_block The saved stream-block for resuming. This must be a
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* read/write buffer of length \c 16 Bytes.
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* \param input The input data stream. This must be a readable buffer of
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* size \p length Bytes.
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* \param output The output data stream. This must be a writable buffer
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* of size \p length Bytes.
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*
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* \return \c 0 if successful.
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* \return A negative error code on failure.
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*/
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int mbedtls_camellia_crypt_ctr(mbedtls_camellia_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[16],
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unsigned char stream_block[16],
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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 0 if successful, or 1 if the test failed
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*/
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int mbedtls_camellia_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 /* camellia.h */
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