mirror of
https://github.com/cuberite/polarssl.git
synced 2025-10-30 19:20:40 -04:00
c662b36af2
Also remove preprocessor logic for MBEDTLS_CONFIG_FILE, since build_info.h alreadyy handles it. This commit was generated using the following script: # ======================== #!/bin/sh git ls-files | grep -v '^include/mbedtls/build_info\.h$' | xargs sed -b -E -i ' /^#if !?defined\(MBEDTLS_CONFIG_FILE\)/i#include "mbedtls/build_info.h" //,/^#endif/d ' # ======================== Signed-off-by: Bence Szépkúti <bence.szepkuti@arm.com>
215 lines
8.1 KiB
C
215 lines
8.1 KiB
C
/**
|
|
* \file chacha20.h
|
|
*
|
|
* \brief This file contains ChaCha20 definitions and functions.
|
|
*
|
|
* ChaCha20 is a stream cipher that can encrypt and decrypt
|
|
* information. ChaCha was created by Daniel Bernstein as a variant of
|
|
* its Salsa cipher https://cr.yp.to/chacha/chacha-20080128.pdf
|
|
* ChaCha20 is the variant with 20 rounds, that was also standardized
|
|
* in RFC 7539.
|
|
*
|
|
* \author Daniel King <damaki.gh@gmail.com>
|
|
*/
|
|
|
|
/*
|
|
* 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_CHACHA20_H
|
|
#define MBEDTLS_CHACHA20_H
|
|
#include "mbedtls/private_access.h"
|
|
|
|
#include "mbedtls/build_info.h"
|
|
|
|
#include <stdint.h>
|
|
#include <stddef.h>
|
|
|
|
#define MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA -0x0051 /**< Invalid input parameter(s). */
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
#if !defined(MBEDTLS_CHACHA20_ALT)
|
|
|
|
typedef struct mbedtls_chacha20_context
|
|
{
|
|
uint32_t MBEDTLS_PRIVATE(state)[16]; /*! The state (before round operations). */
|
|
uint8_t MBEDTLS_PRIVATE(keystream8)[64]; /*! Leftover keystream bytes. */
|
|
size_t MBEDTLS_PRIVATE(keystream_bytes_used); /*! Number of keystream bytes already used. */
|
|
}
|
|
mbedtls_chacha20_context;
|
|
|
|
#else /* MBEDTLS_CHACHA20_ALT */
|
|
#include "chacha20_alt.h"
|
|
#endif /* MBEDTLS_CHACHA20_ALT */
|
|
|
|
/**
|
|
* \brief This function initializes the specified ChaCha20 context.
|
|
*
|
|
* It must be the first API called before using
|
|
* the context.
|
|
*
|
|
* It is usually followed by calls to
|
|
* \c mbedtls_chacha20_setkey() and
|
|
* \c mbedtls_chacha20_starts(), then one or more calls to
|
|
* to \c mbedtls_chacha20_update(), and finally to
|
|
* \c mbedtls_chacha20_free().
|
|
*
|
|
* \param ctx The ChaCha20 context to initialize.
|
|
* This must not be \c NULL.
|
|
*/
|
|
void mbedtls_chacha20_init( mbedtls_chacha20_context *ctx );
|
|
|
|
/**
|
|
* \brief This function releases and clears the specified
|
|
* ChaCha20 context.
|
|
*
|
|
* \param ctx The ChaCha20 context to clear. This may be \c NULL,
|
|
* in which case this function is a no-op. If it is not
|
|
* \c NULL, it must point to an initialized context.
|
|
*
|
|
*/
|
|
void mbedtls_chacha20_free( mbedtls_chacha20_context *ctx );
|
|
|
|
/**
|
|
* \brief This function sets the encryption/decryption key.
|
|
*
|
|
* \note After using this function, you must also call
|
|
* \c mbedtls_chacha20_starts() to set a nonce before you
|
|
* start encrypting/decrypting data with
|
|
* \c mbedtls_chacha_update().
|
|
*
|
|
* \param ctx The ChaCha20 context to which the key should be bound.
|
|
* It must be initialized.
|
|
* \param key The encryption/decryption key. This must be \c 32 Bytes
|
|
* in length.
|
|
*
|
|
* \return \c 0 on success.
|
|
* \return #MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA if ctx or key is NULL.
|
|
*/
|
|
int mbedtls_chacha20_setkey( mbedtls_chacha20_context *ctx,
|
|
const unsigned char key[32] );
|
|
|
|
/**
|
|
* \brief This function sets the nonce and initial counter value.
|
|
*
|
|
* \note A ChaCha20 context can be re-used with the same key by
|
|
* calling this function to change the nonce.
|
|
*
|
|
* \warning You must never use the same nonce twice with the same key.
|
|
* This would void any confidentiality guarantees for the
|
|
* messages encrypted with the same nonce and key.
|
|
*
|
|
* \param ctx The ChaCha20 context to which the nonce should be bound.
|
|
* It must be initialized and bound to a key.
|
|
* \param nonce The nonce. This must be \c 12 Bytes in size.
|
|
* \param counter The initial counter value. This is usually \c 0.
|
|
*
|
|
* \return \c 0 on success.
|
|
* \return #MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA if ctx or nonce is
|
|
* NULL.
|
|
*/
|
|
int mbedtls_chacha20_starts( mbedtls_chacha20_context* ctx,
|
|
const unsigned char nonce[12],
|
|
uint32_t counter );
|
|
|
|
/**
|
|
* \brief This function encrypts or decrypts data.
|
|
*
|
|
* Since ChaCha20 is a stream cipher, the same operation is
|
|
* used for encrypting and decrypting data.
|
|
*
|
|
* \note The \p input and \p output pointers must either be equal or
|
|
* point to non-overlapping buffers.
|
|
*
|
|
* \note \c mbedtls_chacha20_setkey() and
|
|
* \c mbedtls_chacha20_starts() must be called at least once
|
|
* to setup the context before this function can be called.
|
|
*
|
|
* \note This function can be called multiple times in a row in
|
|
* order to encrypt of decrypt data piecewise with the same
|
|
* key and nonce.
|
|
*
|
|
* \param ctx The ChaCha20 context to use for encryption or decryption.
|
|
* It must be initialized and bound to a key and nonce.
|
|
* \param size The length of the input data in Bytes.
|
|
* \param input The buffer holding the input data.
|
|
* This pointer can be \c NULL if `size == 0`.
|
|
* \param output The buffer holding the output data.
|
|
* This must be able to hold \p size Bytes.
|
|
* This pointer can be \c NULL if `size == 0`.
|
|
*
|
|
* \return \c 0 on success.
|
|
* \return A negative error code on failure.
|
|
*/
|
|
int mbedtls_chacha20_update( mbedtls_chacha20_context *ctx,
|
|
size_t size,
|
|
const unsigned char *input,
|
|
unsigned char *output );
|
|
|
|
/**
|
|
* \brief This function encrypts or decrypts data with ChaCha20 and
|
|
* the given key and nonce.
|
|
*
|
|
* Since ChaCha20 is a stream cipher, the same operation is
|
|
* used for encrypting and decrypting data.
|
|
*
|
|
* \warning You must never use the same (key, nonce) pair more than
|
|
* once. This would void any confidentiality guarantees for
|
|
* the messages encrypted with the same nonce and key.
|
|
*
|
|
* \note The \p input and \p output pointers must either be equal or
|
|
* point to non-overlapping buffers.
|
|
*
|
|
* \param key The encryption/decryption key.
|
|
* This must be \c 32 Bytes in length.
|
|
* \param nonce The nonce. This must be \c 12 Bytes in size.
|
|
* \param counter The initial counter value. This is usually \c 0.
|
|
* \param size The length of the input data in Bytes.
|
|
* \param input The buffer holding the input data.
|
|
* This pointer can be \c NULL if `size == 0`.
|
|
* \param output The buffer holding the output data.
|
|
* This must be able to hold \p size Bytes.
|
|
* This pointer can be \c NULL if `size == 0`.
|
|
*
|
|
* \return \c 0 on success.
|
|
* \return A negative error code on failure.
|
|
*/
|
|
int mbedtls_chacha20_crypt( const unsigned char key[32],
|
|
const unsigned char nonce[12],
|
|
uint32_t counter,
|
|
size_t size,
|
|
const unsigned char* input,
|
|
unsigned char* output );
|
|
|
|
#if defined(MBEDTLS_SELF_TEST)
|
|
/**
|
|
* \brief The ChaCha20 checkup routine.
|
|
*
|
|
* \return \c 0 on success.
|
|
* \return \c 1 on failure.
|
|
*/
|
|
int mbedtls_chacha20_self_test( int verbose );
|
|
#endif /* MBEDTLS_SELF_TEST */
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* MBEDTLS_CHACHA20_H */
|