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Diffstat (limited to 'lib/mbedtls-2.27.0/include/mbedtls/blowfish.h')
| -rw-r--r-- | lib/mbedtls-2.27.0/include/mbedtls/blowfish.h | 285 |
1 files changed, 285 insertions, 0 deletions
diff --git a/lib/mbedtls-2.27.0/include/mbedtls/blowfish.h b/lib/mbedtls-2.27.0/include/mbedtls/blowfish.h new file mode 100644 index 0000000..c2a6ff9 --- /dev/null +++ b/lib/mbedtls-2.27.0/include/mbedtls/blowfish.h @@ -0,0 +1,285 @@ +/** + * \file blowfish.h + * + * \brief Blowfish block cipher + */ +/* + * Copyright The Mbed TLS Contributors + * SPDX-License-Identifier: Apache-2.0 + * + * Licensed under the Apache License, Version 2.0 (the "License"); you may + * not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT + * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +#ifndef MBEDTLS_BLOWFISH_H +#define MBEDTLS_BLOWFISH_H + +#if !defined(MBEDTLS_CONFIG_FILE) +#include "mbedtls/config.h" +#else +#include MBEDTLS_CONFIG_FILE +#endif + +#include <stddef.h> +#include <stdint.h> + +#include "mbedtls/platform_util.h" + +#define MBEDTLS_BLOWFISH_ENCRYPT 1 +#define MBEDTLS_BLOWFISH_DECRYPT 0 +#define MBEDTLS_BLOWFISH_MAX_KEY_BITS 448 +#define MBEDTLS_BLOWFISH_MIN_KEY_BITS 32 +#define MBEDTLS_BLOWFISH_ROUNDS 16 /**< Rounds to use. When increasing this value, make sure to extend the initialisation vectors */ +#define MBEDTLS_BLOWFISH_BLOCKSIZE 8 /* Blowfish uses 64 bit blocks */ + +#if !defined(MBEDTLS_DEPRECATED_REMOVED) +#define MBEDTLS_ERR_BLOWFISH_INVALID_KEY_LENGTH MBEDTLS_DEPRECATED_NUMERIC_CONSTANT( -0x0016 ) +#endif /* !MBEDTLS_DEPRECATED_REMOVED */ +#define MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA -0x0016 /**< Bad input data. */ + +#define MBEDTLS_ERR_BLOWFISH_INVALID_INPUT_LENGTH -0x0018 /**< Invalid data input length. */ + +/* MBEDTLS_ERR_BLOWFISH_HW_ACCEL_FAILED is deprecated and should not be used. + */ +#define MBEDTLS_ERR_BLOWFISH_HW_ACCEL_FAILED -0x0017 /**< Blowfish hardware accelerator failed. */ + +#ifdef __cplusplus +extern "C" { +#endif + +#if !defined(MBEDTLS_BLOWFISH_ALT) +// Regular implementation +// + +/** + * \brief Blowfish context structure + */ +typedef struct mbedtls_blowfish_context +{ + uint32_t P[MBEDTLS_BLOWFISH_ROUNDS + 2]; /*!< Blowfish round keys */ + uint32_t S[4][256]; /*!< key dependent S-boxes */ +} +mbedtls_blowfish_context; + +#else /* MBEDTLS_BLOWFISH_ALT */ +#include "blowfish_alt.h" +#endif /* MBEDTLS_BLOWFISH_ALT */ + +/** + * \brief Initialize a Blowfish context. + * + * \param ctx The Blowfish context to be initialized. + * This must not be \c NULL. + */ +void mbedtls_blowfish_init( mbedtls_blowfish_context *ctx ); + +/** + * \brief Clear a Blowfish context. + * + * \param ctx The Blowfish context to be cleared. + * This may be \c NULL, in which case this function + * returns immediately. If it is not \c NULL, it must + * point to an initialized Blowfish context. + */ +void mbedtls_blowfish_free( mbedtls_blowfish_context *ctx ); + +/** + * \brief Perform a Blowfish key schedule operation. + * + * \param ctx The Blowfish context to perform the key schedule on. + * \param key The encryption key. This must be a readable buffer of + * length \p keybits Bits. + * \param keybits The length of \p key in Bits. This must be between + * \c 32 and \c 448 and a multiple of \c 8. + * + * \return \c 0 if successful. + * \return A negative error code on failure. + */ +int mbedtls_blowfish_setkey( mbedtls_blowfish_context *ctx, const unsigned char *key, + unsigned int keybits ); + +/** + * \brief Perform a Blowfish-ECB block encryption/decryption operation. + * + * \param ctx The Blowfish context to use. This must be initialized + * and bound to a key. + * \param mode The mode of operation. Possible values are + * #MBEDTLS_BLOWFISH_ENCRYPT for encryption, or + * #MBEDTLS_BLOWFISH_DECRYPT for decryption. + * \param input The input block. This must be a readable buffer + * of size \c 8 Bytes. + * \param output The output block. This must be a writable buffer + * of size \c 8 Bytes. + * + * \return \c 0 if successful. + * \return A negative error code on failure. + */ +int mbedtls_blowfish_crypt_ecb( mbedtls_blowfish_context *ctx, + int mode, + const unsigned char input[MBEDTLS_BLOWFISH_BLOCKSIZE], + unsigned char output[MBEDTLS_BLOWFISH_BLOCKSIZE] ); + +#if defined(MBEDTLS_CIPHER_MODE_CBC) +/** + * \brief Perform a Blowfish-CBC buffer encryption/decryption operation. + * + * \note Upon exit, the content of the IV is updated so that you can + * call the function same function again on the following + * block(s) of data and get the same result as if it was + * encrypted in one call. This allows a "streaming" usage. + * If on the other hand you need to retain the contents of the + * IV, you should either save it manually or use the cipher + * module instead. + * + * \param ctx The Blowfish context to use. This must be initialized + * and bound to a key. + * \param mode The mode of operation. Possible values are + * #MBEDTLS_BLOWFISH_ENCRYPT for encryption, or + * #MBEDTLS_BLOWFISH_DECRYPT for decryption. + * \param length The length of the input data in Bytes. This must be + * multiple of \c 8. + * \param iv The initialization vector. This must be a read/write buffer + * of length \c 8 Bytes. It is updated by this function. + * \param input The input data. This must be a readable buffer of length + * \p length Bytes. + * \param output The output data. This must be a writable buffer of length + * \p length Bytes. + * + * \return \c 0 if successful. + * \return A negative error code on failure. + */ +int mbedtls_blowfish_crypt_cbc( mbedtls_blowfish_context *ctx, + int mode, + size_t length, + unsigned char iv[MBEDTLS_BLOWFISH_BLOCKSIZE], + const unsigned char *input, + unsigned char *output ); +#endif /* MBEDTLS_CIPHER_MODE_CBC */ + +#if defined(MBEDTLS_CIPHER_MODE_CFB) +/** + * \brief Perform a Blowfish CFB buffer encryption/decryption operation. + * + * \note Upon exit, the content of the IV is updated so that you can + * call the function same function again on the following + * block(s) of data and get the same result as if it was + * encrypted in one call. This allows a "streaming" usage. + * If on the other hand you need to retain the contents of the + * IV, you should either save it manually or use the cipher + * module instead. + * + * \param ctx The Blowfish context to use. This must be initialized + * and bound to a key. + * \param mode The mode of operation. Possible values are + * #MBEDTLS_BLOWFISH_ENCRYPT for encryption, or + * #MBEDTLS_BLOWFISH_DECRYPT for decryption. + * \param length The length of the input data in Bytes. + * \param iv_off The offset in the initialiation vector. + * The value pointed to must be smaller than \c 8 Bytes. + * It is updated by this function to support the aforementioned + * streaming usage. + * \param iv The initialization vector. This must be a read/write buffer + * of size \c 8 Bytes. It is updated after use. + * \param input The input data. This must be a readable buffer of length + * \p length Bytes. + * \param output The output data. This must be a writable buffer of length + * \p length Bytes. + * + * \return \c 0 if successful. + * \return A negative error code on failure. + */ +int mbedtls_blowfish_crypt_cfb64( mbedtls_blowfish_context *ctx, + int mode, + size_t length, + size_t *iv_off, + unsigned char iv[MBEDTLS_BLOWFISH_BLOCKSIZE], + const unsigned char *input, + unsigned char *output ); +#endif /*MBEDTLS_CIPHER_MODE_CFB */ + +#if defined(MBEDTLS_CIPHER_MODE_CTR) +/** + * \brief Perform a Blowfish-CTR buffer encryption/decryption operation. + * + * \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**64 + * 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 4 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 4 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**32 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. + * + * Note that for both stategies, sizes are measured in blocks and + * that a Blowfish block is 8 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 Blowfish context to use. This must be initialized + * and bound to a key. + * \param length The length of the input data in Bytes. + * \param nc_off The offset in the current stream_block (for resuming + * within current cipher stream). The offset pointer + * should be \c 0 at the start of a stream and must be + * smaller than \c 8. It is updated by this function. + * \param nonce_counter The 64-bit nonce and counter. This must point to a + * read/write buffer of length \c 8 Bytes. + * \param stream_block The saved stream-block for resuming. This must point to + * a read/write buffer of length \c 8 Bytes. + * \param input The input data. This must be a readable buffer of + * length \p length Bytes. + * \param output The output data. This must be a writable buffer of + * length \p length Bytes. + * + * \return \c 0 if successful. + * \return A negative error code on failure. + */ +int mbedtls_blowfish_crypt_ctr( mbedtls_blowfish_context *ctx, + size_t length, + size_t *nc_off, + unsigned char nonce_counter[MBEDTLS_BLOWFISH_BLOCKSIZE], + unsigned char stream_block[MBEDTLS_BLOWFISH_BLOCKSIZE], + const unsigned char *input, + unsigned char *output ); +#endif /* MBEDTLS_CIPHER_MODE_CTR */ + +#ifdef __cplusplus +} +#endif + +#endif /* blowfish.h */ |