/**
 * \file md.h
 *
 * \brief This file contains the generic message-digest wrapper.
 *
 * \author Adriaan de Jong <dejong@fox-it.com>
 */
/*
 *  Copyright The Mbed TLS Contributors
 *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
 *
 *  This file is provided under the Apache License 2.0, or the
 *  GNU General Public License v2.0 or later.
 *
 *  **********
 *  Apache License 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.
 *
 *  **********
 *
 *  **********
 *  GNU General Public License v2.0 or later:
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *  You should have received a copy of the GNU General Public License along
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 */

#ifndef MBEDTLS_MD_H
#define MBEDTLS_MD_H

#include <stddef.h>

#if !defined( MBEDTLS_CONFIG_FILE )
    #include "config.h"
#else
    #include MBEDTLS_CONFIG_FILE
#endif

#define MBEDTLS_ERR_MD_FEATURE_UNAVAILABLE    -0x5080              /**< The selected feature is not available. */
#define MBEDTLS_ERR_MD_BAD_INPUT_DATA         -0x5100              /**< Bad input parameters to function. */
#define MBEDTLS_ERR_MD_ALLOC_FAILED           -0x5180              /**< Failed to allocate memory. */
#define MBEDTLS_ERR_MD_FILE_IO_ERROR          -0x5200              /**< Opening or reading of file failed. */

/* MBEDTLS_ERR_MD_HW_ACCEL_FAILED is deprecated and should not be used. */
#define MBEDTLS_ERR_MD_HW_ACCEL_FAILED        -0x5280              /**< MD hardware accelerator failed. */

#ifdef __cplusplus
    extern "C" {
#endif

/**
 * \brief     Supported message digests.
 *
 * \warning   MD2, MD4, MD5 and SHA-1 are considered weak message digests and
 *            their use constitutes a security risk. We recommend considering
 *            stronger message digests instead.
 *
 */
typedef enum
{
    MBEDTLS_MD_NONE = 0,  /**< None. */
    MBEDTLS_MD_MD2,       /**< The MD2 message digest. */
    MBEDTLS_MD_MD4,       /**< The MD4 message digest. */
    MBEDTLS_MD_MD5,       /**< The MD5 message digest. */
    MBEDTLS_MD_SHA1,      /**< The SHA-1 message digest. */
    MBEDTLS_MD_SHA224,    /**< The SHA-224 message digest. */
    MBEDTLS_MD_SHA256,    /**< The SHA-256 message digest. */
    MBEDTLS_MD_SHA384,    /**< The SHA-384 message digest. */
    MBEDTLS_MD_SHA512,    /**< The SHA-512 message digest. */
    MBEDTLS_MD_RIPEMD160, /**< The RIPEMD-160 message digest. */
} mbedtls_md_type_t;

#if defined( MBEDTLS_SHA512_C )
    #define MBEDTLS_MD_MAX_SIZE    64   /* longest known is SHA512 */
#else
    #define MBEDTLS_MD_MAX_SIZE    32   /* longest known is SHA256 or less */
#endif

/**
 * Opaque struct defined in md_internal.h.
 */
typedef struct mbedtls_md_info_t mbedtls_md_info_t;

/**
 * The generic message-digest context.
 */
typedef struct mbedtls_md_context_t
{
    /** Information about the associated message digest. */
    const mbedtls_md_info_t * md_info;

    /** The digest-specific context. */
    void * md_ctx;

    /** The HMAC part of the context. */
    void * hmac_ctx;
} mbedtls_md_context_t;

/**
 * \brief           This function returns the list of digests supported by the
 *                  generic digest module.
 *
 * \note            The list starts with the strongest available hashes.
 *
 * \return          A statically allocated array of digests. Each element
 *                  in the returned list is an integer belonging to the
 *                  message-digest enumeration #mbedtls_md_type_t.
 *                  The last entry is 0.
 */
const int *mbedtls_md_list( void );

/**
 * \brief           This function returns the message-digest information
 *                  associated with the given digest name.
 *
 * \param md_name   The name of the digest to search for.
 *
 * \return          The message-digest information associated with \p md_name.
 * \return          NULL if the associated message-digest information is not found.
 */
const mbedtls_md_info_t *mbedtls_md_info_from_string( const char * md_name );

/**
 * \brief           This function returns the message-digest information
 *                  associated with the given digest type.
 *
 * \param md_type   The type of digest to search for.
 *
 * \return          The message-digest information associated with \p md_type.
 * \return          NULL if the associated message-digest information is not found.
 */
const mbedtls_md_info_t *mbedtls_md_info_from_type( mbedtls_md_type_t md_type );

/**
 * \brief           This function initializes a message-digest context without
 *                  binding it to a particular message-digest algorithm.
 *
 *                  This function should always be called first. It prepares the
 *                  context for mbedtls_md_setup() for binding it to a
 *                  message-digest algorithm.
 */
void mbedtls_md_init( mbedtls_md_context_t * ctx );

/**
 * \brief           This function clears the internal structure of \p ctx and
 *                  frees any embedded internal structure, but does not free
 *                  \p ctx itself.
 *
 *                  If you have called mbedtls_md_setup() on \p ctx, you must
 *                  call mbedtls_md_free() when you are no longer using the
 *                  context.
 *                  Calling this function if you have previously
 *                  called mbedtls_md_init() and nothing else is optional.
 *                  You must not call this function if you have not called
 *                  mbedtls_md_init().
 */
void mbedtls_md_free( mbedtls_md_context_t * ctx );

#if !defined( MBEDTLS_DEPRECATED_REMOVED )
    #if defined( MBEDTLS_DEPRECATED_WARNING )
        #define MBEDTLS_DEPRECATED    __attribute__( ( deprecated ) )
    #else
        #define MBEDTLS_DEPRECATED
    #endif

/**
 * \brief           This function selects the message digest algorithm to use,
 *                  and allocates internal structures.
 *
 *                  It should be called after mbedtls_md_init() or mbedtls_md_free().
 *                  Makes it necessary to call mbedtls_md_free() later.
 *
 * \deprecated      Superseded by mbedtls_md_setup() in 2.0.0
 *
 * \param ctx       The context to set up.
 * \param md_info   The information structure of the message-digest algorithm
 *                  to use.
 *
 * \return          \c 0 on success.
 * \return          #MBEDTLS_ERR_MD_BAD_INPUT_DATA on parameter-verification
 *                  failure.
 * \return          #MBEDTLS_ERR_MD_ALLOC_FAILED on memory-allocation failure.
 */
    int mbedtls_md_init_ctx( mbedtls_md_context_t * ctx,
                             const mbedtls_md_info_t * md_info ) MBEDTLS_DEPRECATED;
    #undef MBEDTLS_DEPRECATED
#endif /* MBEDTLS_DEPRECATED_REMOVED */

/**
 * \brief           This function selects the message digest algorithm to use,
 *                  and allocates internal structures.
 *
 *                  It should be called after mbedtls_md_init() or
 *                  mbedtls_md_free(). Makes it necessary to call
 *                  mbedtls_md_free() later.
 *
 * \param ctx       The context to set up.
 * \param md_info   The information structure of the message-digest algorithm
 *                  to use.
 * \param hmac      Defines if HMAC is used. 0: HMAC is not used (saves some memory),
 *                  or non-zero: HMAC is used with this context.
 *
 * \return          \c 0 on success.
 * \return          #MBEDTLS_ERR_MD_BAD_INPUT_DATA on parameter-verification
 *                  failure.
 * \return          #MBEDTLS_ERR_MD_ALLOC_FAILED on memory-allocation failure.
 */
int mbedtls_md_setup( mbedtls_md_context_t * ctx,
                      const mbedtls_md_info_t * md_info,
                      int hmac );

/**
 * \brief           This function clones the state of an message-digest
 *                  context.
 *
 * \note            You must call mbedtls_md_setup() on \c dst before calling
 *                  this function.
 *
 * \note            The two contexts must have the same type,
 *                  for example, both are SHA-256.
 *
 * \warning         This function clones the message-digest state, not the
 *                  HMAC state.
 *
 * \param dst       The destination context.
 * \param src       The context to be cloned.
 *
 * \return          \c 0 on success.
 * \return          #MBEDTLS_ERR_MD_BAD_INPUT_DATA on parameter-verification failure.
 */
int mbedtls_md_clone( mbedtls_md_context_t * dst,
                      const mbedtls_md_context_t * src );

/**
 * \brief           This function extracts the message-digest size from the
 *                  message-digest information structure.
 *
 * \param md_info   The information structure of the message-digest algorithm
 *                  to use.
 *
 * \return          The size of the message-digest output in Bytes.
 */
unsigned char mbedtls_md_get_size( const mbedtls_md_info_t * md_info );

/**
 * \brief           This function extracts the message-digest type from the
 *                  message-digest information structure.
 *
 * \param md_info   The information structure of the message-digest algorithm
 *                  to use.
 *
 * \return          The type of the message digest.
 */
mbedtls_md_type_t mbedtls_md_get_type( const mbedtls_md_info_t * md_info );

/**
 * \brief           This function extracts the message-digest name from the
 *                  message-digest information structure.
 *
 * \param md_info   The information structure of the message-digest algorithm
 *                  to use.
 *
 * \return          The name of the message digest.
 */
const char *mbedtls_md_get_name( const mbedtls_md_info_t * md_info );

/**
 * \brief           This function starts a message-digest computation.
 *
 *                  You must call this function after setting up the context
 *                  with mbedtls_md_setup(), and before passing data with
 *                  mbedtls_md_update().
 *
 * \param ctx       The generic message-digest context.
 *
 * \return          \c 0 on success.
 * \return          #MBEDTLS_ERR_MD_BAD_INPUT_DATA on parameter-verification
 *                  failure.
 */
int mbedtls_md_starts( mbedtls_md_context_t * ctx );

/**
 * \brief           This function feeds an input buffer into an ongoing
 *                  message-digest computation.
 *
 *                  You must call mbedtls_md_starts() before calling this
 *                  function. You may call this function multiple times.
 *                  Afterwards, call mbedtls_md_finish().
 *
 * \param ctx       The generic message-digest context.
 * \param input     The buffer holding the input data.
 * \param ilen      The length of the input data.
 *
 * \return          \c 0 on success.
 * \return          #MBEDTLS_ERR_MD_BAD_INPUT_DATA on parameter-verification
 *                  failure.
 */
int mbedtls_md_update( mbedtls_md_context_t * ctx,
                       const unsigned char * input,
                       size_t ilen );

/**
 * \brief           This function finishes the digest operation,
 *                  and writes the result to the output buffer.
 *
 *                  Call this function after a call to mbedtls_md_starts(),
 *                  followed by any number of calls to mbedtls_md_update().
 *                  Afterwards, you may either clear the context with
 *                  mbedtls_md_free(), or call mbedtls_md_starts() to reuse
 *                  the context for another digest operation with the same
 *                  algorithm.
 *
 * \param ctx       The generic message-digest context.
 * \param output    The buffer for the generic message-digest checksum result.
 *
 * \return          \c 0 on success.
 * \return          #MBEDTLS_ERR_MD_BAD_INPUT_DATA on parameter-verification
 *                  failure.
 */
int mbedtls_md_finish( mbedtls_md_context_t * ctx,
                       unsigned char * output );

/**
 * \brief          This function calculates the message-digest of a buffer,
 *                 with respect to a configurable message-digest algorithm
 *                 in a single call.
 *
 *                 The result is calculated as
 *                 Output = message_digest(input buffer).
 *
 * \param md_info  The information structure of the message-digest algorithm
 *                 to use.
 * \param input    The buffer holding the data.
 * \param ilen     The length of the input data.
 * \param output   The generic message-digest checksum result.
 *
 * \return         \c 0 on success.
 * \return         #MBEDTLS_ERR_MD_BAD_INPUT_DATA on parameter-verification
 *                 failure.
 */
int mbedtls_md( const mbedtls_md_info_t * md_info,
                const unsigned char * input,
                size_t ilen,
                unsigned char * output );

#if defined( MBEDTLS_FS_IO )

/**
 * \brief          This function calculates the message-digest checksum
 *                 result of the contents of the provided file.
 *
 *                 The result is calculated as
 *                 Output = message_digest(file contents).
 *
 * \param md_info  The information structure of the message-digest algorithm
 *                 to use.
 * \param path     The input file name.
 * \param output   The generic message-digest checksum result.
 *
 * \return         \c 0 on success.
 * \return         #MBEDTLS_ERR_MD_FILE_IO_ERROR on an I/O error accessing
 *                 the file pointed by \p path.
 * \return         #MBEDTLS_ERR_MD_BAD_INPUT_DATA if \p md_info was NULL.
 */
    int mbedtls_md_file( const mbedtls_md_info_t * md_info,
                         const char * path,
                         unsigned char * output );
#endif /* MBEDTLS_FS_IO */

/**
 * \brief           This function sets the HMAC key and prepares to
 *                  authenticate a new message.
 *
 *                  Call this function after mbedtls_md_setup(), to use
 *                  the MD context for an HMAC calculation, then call
 *                  mbedtls_md_hmac_update() to provide the input data, and
 *                  mbedtls_md_hmac_finish() to get the HMAC value.
 *
 * \param ctx       The message digest context containing an embedded HMAC
 *                  context.
 * \param key       The HMAC secret key.
 * \param keylen    The length of the HMAC key in Bytes.
 *
 * \return          \c 0 on success.
 * \return          #MBEDTLS_ERR_MD_BAD_INPUT_DATA on parameter-verification
 *                  failure.
 */
int mbedtls_md_hmac_starts( mbedtls_md_context_t * ctx,
                            const unsigned char * key,
                            size_t keylen );

/**
 * \brief           This function feeds an input buffer into an ongoing HMAC
 *                  computation.
 *
 *                  Call mbedtls_md_hmac_starts() or mbedtls_md_hmac_reset()
 *                  before calling this function.
 *                  You may call this function multiple times to pass the
 *                  input piecewise.
 *                  Afterwards, call mbedtls_md_hmac_finish().
 *
 * \param ctx       The message digest context containing an embedded HMAC
 *                  context.
 * \param input     The buffer holding the input data.
 * \param ilen      The length of the input data.
 *
 * \return          \c 0 on success.
 * \return          #MBEDTLS_ERR_MD_BAD_INPUT_DATA on parameter-verification
 *                  failure.
 */
int mbedtls_md_hmac_update( mbedtls_md_context_t * ctx,
                            const unsigned char * input,
                            size_t ilen );

/**
 * \brief           This function finishes the HMAC operation, and writes
 *                  the result to the output buffer.
 *
 *                  Call this function after mbedtls_md_hmac_starts() and
 *                  mbedtls_md_hmac_update() to get the HMAC value. Afterwards
 *                  you may either call mbedtls_md_free() to clear the context,
 *                  or call mbedtls_md_hmac_reset() to reuse the context with
 *                  the same HMAC key.
 *
 * \param ctx       The message digest context containing an embedded HMAC
 *                  context.
 * \param output    The generic HMAC checksum result.
 *
 * \return          \c 0 on success.
 * \return          #MBEDTLS_ERR_MD_BAD_INPUT_DATA on parameter-verification
 *                  failure.
 */
int mbedtls_md_hmac_finish( mbedtls_md_context_t * ctx,
                            unsigned char * output );

/**
 * \brief           This function prepares to authenticate a new message with
 *                  the same key as the previous HMAC operation.
 *
 *                  You may call this function after mbedtls_md_hmac_finish().
 *                  Afterwards call mbedtls_md_hmac_update() to pass the new
 *                  input.
 *
 * \param ctx       The message digest context containing an embedded HMAC
 *                  context.
 *
 * \return          \c 0 on success.
 * \return          #MBEDTLS_ERR_MD_BAD_INPUT_DATA on parameter-verification
 *                  failure.
 */
int mbedtls_md_hmac_reset( mbedtls_md_context_t * ctx );

/**
 * \brief          This function calculates the full generic HMAC
 *                 on the input buffer with the provided key.
 *
 *                 The function allocates the context, performs the
 *                 calculation, and frees the context.
 *
 *                 The HMAC result is calculated as
 *                 output = generic HMAC(hmac key, input buffer).
 *
 * \param md_info  The information structure of the message-digest algorithm
 *                 to use.
 * \param key      The HMAC secret key.
 * \param keylen   The length of the HMAC secret key in Bytes.
 * \param input    The buffer holding the input data.
 * \param ilen     The length of the input data.
 * \param output   The generic HMAC result.
 *
 * \return         \c 0 on success.
 * \return         #MBEDTLS_ERR_MD_BAD_INPUT_DATA on parameter-verification
 *                 failure.
 */
int mbedtls_md_hmac( const mbedtls_md_info_t * md_info,
                     const unsigned char * key,
                     size_t keylen,
                     const unsigned char * input,
                     size_t ilen,
                     unsigned char * output );

/* Internal use */
int mbedtls_md_process( mbedtls_md_context_t * ctx,
                        const unsigned char * data );

#ifdef __cplusplus
    }
#endif

#endif /* MBEDTLS_MD_H */
