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284 lines
12 KiB
C
284 lines
12 KiB
C
/**
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* \file blowfish.h
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*
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* \brief Blowfish 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
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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_BLOWFISH_H
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#define MBEDTLS_BLOWFISH_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_BLOWFISH_ENCRYPT 1
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#define MBEDTLS_BLOWFISH_DECRYPT 0
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#define MBEDTLS_BLOWFISH_MAX_KEY_BITS 448
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#define MBEDTLS_BLOWFISH_MIN_KEY_BITS 32
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#define MBEDTLS_BLOWFISH_ROUNDS 16 /**< Rounds to use. When increasing this value, make sure to extend the initialisation vectors */
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#define MBEDTLS_BLOWFISH_BLOCKSIZE 8 /* Blowfish uses 64 bit blocks */
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#if !defined(MBEDTLS_DEPRECATED_REMOVED)
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#define MBEDTLS_ERR_BLOWFISH_INVALID_KEY_LENGTH MBEDTLS_DEPRECATED_NUMERIC_CONSTANT( -0x0016 )
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#endif /* !MBEDTLS_DEPRECATED_REMOVED */
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#define MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA -0x0016 /**< Bad input data. */
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#define MBEDTLS_ERR_BLOWFISH_INVALID_INPUT_LENGTH -0x0018 /**< Invalid data input length. */
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/* MBEDTLS_ERR_BLOWFISH_HW_ACCEL_FAILED is deprecated and should not be used.
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*/
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#define MBEDTLS_ERR_BLOWFISH_HW_ACCEL_FAILED -0x0017 /**< Blowfish hardware accelerator failed. */
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if !defined(MBEDTLS_BLOWFISH_ALT)
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// Regular implementation
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//
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/**
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* \brief Blowfish context structure
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*/
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typedef struct mbedtls_blowfish_context {
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uint32_t P[MBEDTLS_BLOWFISH_ROUNDS + 2]; /*!< Blowfish round keys */
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uint32_t S[4][256]; /*!< key dependent S-boxes */
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}
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mbedtls_blowfish_context;
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#else /* MBEDTLS_BLOWFISH_ALT */
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#include "blowfish_alt.h"
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#endif /* MBEDTLS_BLOWFISH_ALT */
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/**
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* \brief Initialize a Blowfish context.
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*
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* \param ctx The Blowfish context to be initialized.
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* This must not be \c NULL.
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*/
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void mbedtls_blowfish_init(mbedtls_blowfish_context *ctx);
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/**
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* \brief Clear a Blowfish context.
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*
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* \param ctx The Blowfish context to be cleared.
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* This may be \c NULL, in which case this function
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* returns immediately. If it is not \c NULL, it must
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* point to an initialized Blowfish context.
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*/
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void mbedtls_blowfish_free(mbedtls_blowfish_context *ctx);
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/**
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* \brief Perform a Blowfish key schedule operation.
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*
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* \param ctx The Blowfish context to perform the key schedule on.
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* \param key The encryption key. This must be a readable buffer of
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* length \p keybits Bits.
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* \param keybits The length of \p key in Bits. This must be between
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* \c 32 and \c 448 and a multiple of \c 8.
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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_blowfish_setkey(mbedtls_blowfish_context *ctx, const unsigned char *key,
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unsigned int keybits);
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/**
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* \brief Perform a Blowfish-ECB block encryption/decryption operation.
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*
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* \param ctx The Blowfish 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. Possible values are
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* #MBEDTLS_BLOWFISH_ENCRYPT for encryption, or
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* #MBEDTLS_BLOWFISH_DECRYPT for decryption.
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* \param input The input block. This must be a readable buffer
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* of size \c 8 Bytes.
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* \param output The output block. This must be a writable buffer
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* of size \c 8 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_blowfish_crypt_ecb(mbedtls_blowfish_context *ctx,
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int mode,
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const unsigned char input[MBEDTLS_BLOWFISH_BLOCKSIZE],
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unsigned char output[MBEDTLS_BLOWFISH_BLOCKSIZE]);
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#if defined(MBEDTLS_CIPHER_MODE_CBC)
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/**
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* \brief Perform a Blowfish-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 Blowfish 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. Possible values are
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* #MBEDTLS_BLOWFISH_ENCRYPT for encryption, or
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* #MBEDTLS_BLOWFISH_DECRYPT for decryption.
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* \param length The length of the input data in Bytes. This must be
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* multiple of \c 8.
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* \param iv The initialization vector. This must be a read/write buffer
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* of length \c 8 Bytes. It is updated by this function.
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* \param input The input data. This must be a readable buffer of length
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* \p length Bytes.
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* \param output The output data. This must be a writable buffer of length
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* \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_blowfish_crypt_cbc(mbedtls_blowfish_context *ctx,
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int mode,
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size_t length,
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unsigned char iv[MBEDTLS_BLOWFISH_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 Perform a Blowfish CFB 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 Blowfish 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. Possible values are
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* #MBEDTLS_BLOWFISH_ENCRYPT for encryption, or
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* #MBEDTLS_BLOWFISH_DECRYPT for decryption.
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* \param length The length of the input data in Bytes.
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* \param iv_off The offset in the initialiation vector.
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* The value pointed to must be smaller than \c 8 Bytes.
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* It is updated by this function to support the aforementioned
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* streaming usage.
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* \param iv The initialization vector. This must be a read/write buffer
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* of size \c 8 Bytes. It is updated after use.
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* \param input The input data. This must be a readable buffer of length
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* \p length Bytes.
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* \param output The output data. This must be a writable buffer of length
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* \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_blowfish_crypt_cfb64(mbedtls_blowfish_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_BLOWFISH_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 Perform a Blowfish-CTR buffer encryption/decryption operation.
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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**64
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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 4 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 4 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**32 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.
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*
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* Note that for both stategies, sizes are measured in blocks and
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* that a Blowfish block is 8 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 Blowfish 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 in Bytes.
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* \param nc_off The offset in the current stream_block (for resuming
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* within current cipher stream). The offset pointer
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* should be \c 0 at the start of a stream and must be
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* smaller than \c 8. It is updated by this function.
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* \param nonce_counter The 64-bit nonce and counter. This must point to a
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* read/write buffer of length \c 8 Bytes.
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* \param stream_block The saved stream-block for resuming. This must point to
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* a read/write buffer of length \c 8 Bytes.
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* \param input The input data. This must be a readable buffer of
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* length \p length Bytes.
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* \param output The output data. This must be a writable buffer of
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* 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_blowfish_crypt_ctr(mbedtls_blowfish_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_BLOWFISH_BLOCKSIZE],
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unsigned char stream_block[MBEDTLS_BLOWFISH_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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#ifdef __cplusplus
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}
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#endif
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#endif /* blowfish.h */
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