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216 lines
8.1 KiB
C
216 lines
8.1 KiB
C
/**
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* \file chacha20.h
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*
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* \brief This file contains ChaCha20 definitions and functions.
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*
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* ChaCha20 is a stream cipher that can encrypt and decrypt
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* information. ChaCha was created by Daniel Bernstein as a variant of
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* its Salsa cipher https://cr.yp.to/chacha/chacha-20080128.pdf
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* ChaCha20 is the variant with 20 rounds, that was also standardized
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* in RFC 7539.
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*
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* \author Daniel King <damaki.gh@gmail.com>
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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_CHACHA20_H
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#define MBEDTLS_CHACHA20_H
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#include "mbedtls/private_access.h"
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#include "mbedtls/build_info.h"
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#include <stdint.h>
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#include <stddef.h>
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/** Invalid input parameter(s). */
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#define MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA -0x0051
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if !defined(MBEDTLS_CHACHA20_ALT)
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typedef struct mbedtls_chacha20_context
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{
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uint32_t MBEDTLS_PRIVATE(state)[16]; /*! The state (before round operations). */
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uint8_t MBEDTLS_PRIVATE(keystream8)[64]; /*! Leftover keystream bytes. */
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size_t MBEDTLS_PRIVATE(keystream_bytes_used); /*! Number of keystream bytes already used. */
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}
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mbedtls_chacha20_context;
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#else /* MBEDTLS_CHACHA20_ALT */
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#include "chacha20_alt.h"
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#endif /* MBEDTLS_CHACHA20_ALT */
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/**
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* \brief This function initializes the specified ChaCha20 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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* It is usually followed by calls to
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* \c mbedtls_chacha20_setkey() and
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* \c mbedtls_chacha20_starts(), then one or more calls to
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* to \c mbedtls_chacha20_update(), and finally to
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* \c mbedtls_chacha20_free().
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*
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* \param ctx The ChaCha20 context to initialize.
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* This must not be \c NULL.
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*/
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void mbedtls_chacha20_init( mbedtls_chacha20_context *ctx );
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/**
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* \brief This function releases and clears the specified
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* ChaCha20 context.
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*
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* \param ctx The ChaCha20 context to clear. This may be \c NULL,
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* in which case this function is a no-op. If it is not
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* \c NULL, it must point to an initialized context.
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*
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*/
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void mbedtls_chacha20_free( mbedtls_chacha20_context *ctx );
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/**
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* \brief This function sets the encryption/decryption key.
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*
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* \note After using this function, you must also call
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* \c mbedtls_chacha20_starts() to set a nonce before you
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* start encrypting/decrypting data with
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* \c mbedtls_chacha_update().
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*
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* \param ctx The ChaCha20 context to which the key should be bound.
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* It must be initialized.
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* \param key The encryption/decryption key. This must be \c 32 Bytes
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* in length.
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*
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* \return \c 0 on success.
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* \return #MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA if ctx or key is NULL.
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*/
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int mbedtls_chacha20_setkey( mbedtls_chacha20_context *ctx,
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const unsigned char key[32] );
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/**
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* \brief This function sets the nonce and initial counter value.
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*
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* \note A ChaCha20 context can be re-used with the same key by
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* calling this function to change the nonce.
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*
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* \warning You must never use the same nonce twice with the same key.
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* This would void any confidentiality guarantees for the
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* messages encrypted with the same nonce and key.
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*
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* \param ctx The ChaCha20 context to which the nonce should be bound.
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* It must be initialized and bound to a key.
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* \param nonce The nonce. This must be \c 12 Bytes in size.
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* \param counter The initial counter value. This is usually \c 0.
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*
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* \return \c 0 on success.
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* \return #MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA if ctx or nonce is
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* NULL.
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*/
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int mbedtls_chacha20_starts( mbedtls_chacha20_context* ctx,
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const unsigned char nonce[12],
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uint32_t counter );
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/**
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* \brief This function encrypts or decrypts data.
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*
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* Since ChaCha20 is a stream cipher, the same operation is
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* used for encrypting and decrypting data.
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*
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* \note The \p input and \p output pointers must either be equal or
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* point to non-overlapping buffers.
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*
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* \note \c mbedtls_chacha20_setkey() and
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* \c mbedtls_chacha20_starts() must be called at least once
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* to setup the context before this function can be called.
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*
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* \note This function can be called multiple times in a row in
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* order to encrypt of decrypt data piecewise with the same
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* key and nonce.
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*
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* \param ctx The ChaCha20 context to use for encryption or decryption.
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* It must be initialized and bound to a key and nonce.
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* \param size The length of the input data in Bytes.
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* \param input The buffer holding the input data.
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* This pointer can be \c NULL if `size == 0`.
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* \param output The buffer holding the output data.
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* This must be able to hold \p size Bytes.
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* This pointer can be \c NULL if `size == 0`.
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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_chacha20_update( mbedtls_chacha20_context *ctx,
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size_t size,
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const unsigned char *input,
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unsigned char *output );
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/**
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* \brief This function encrypts or decrypts data with ChaCha20 and
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* the given key and nonce.
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*
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* Since ChaCha20 is a stream cipher, the same operation is
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* used for encrypting and decrypting data.
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*
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* \warning You must never use the same (key, nonce) pair more than
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* once. This would void any confidentiality guarantees for
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* the messages encrypted with the same nonce and key.
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*
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* \note The \p input and \p output pointers must either be equal or
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* point to non-overlapping buffers.
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*
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* \param key The encryption/decryption key.
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* This must be \c 32 Bytes in length.
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* \param nonce The nonce. This must be \c 12 Bytes in size.
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* \param counter The initial counter value. This is usually \c 0.
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* \param size The length of the input data in Bytes.
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* \param input The buffer holding the input data.
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* This pointer can be \c NULL if `size == 0`.
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* \param output The buffer holding the output data.
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* This must be able to hold \p size Bytes.
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* This pointer can be \c NULL if `size == 0`.
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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_chacha20_crypt( const unsigned char key[32],
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const unsigned char nonce[12],
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uint32_t counter,
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size_t size,
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const unsigned char* input,
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unsigned char* output );
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#if defined(MBEDTLS_SELF_TEST)
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/**
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* \brief The ChaCha20 checkup routine.
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*
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* \return \c 0 on success.
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* \return \c 1 on failure.
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*/
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int mbedtls_chacha20_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 /* MBEDTLS_CHACHA20_H */
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