/**
* \file md.h
*
* \brief Generic message digest wrapper
*
* \author Adriaan de Jong <dejong@fox-it.com>
*
* Copyright (C) 2006-2011, Brainspark B.V.
*
* This file is part of PolarSSL (http://www.polarssl.org)
* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
*
* All rights reserved.
*
* 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
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef POLARSSL_MD_H
#define POLARSSL_MD_H
#include <string.h>
#if defined(_MSC_VER) && !defined(inline)
#define inline _inline
#else
#if defined(__ARMCC_VERSION) && !defined(inline)
#define inline __inline
#endif /* __ARMCC_VERSION */
#endif /*_MSC_VER */
#define POLARSSL_ERR_MD_FEATURE_UNAVAILABLE -0x5080 /**< The selected feature is not available. */
#define POLARSSL_ERR_MD_BAD_INPUT_DATA -0x5100 /**< Bad input parameters to function. */
#define POLARSSL_ERR_MD_ALLOC_FAILED -0x5180 /**< Failed to allocate memory. */
#define POLARSSL_ERR_MD_FILE_IO_ERROR -0x5200 /**< Opening or reading of file failed. */
typedef enum {
POLARSSL_MD_NONE=0,
POLARSSL_MD_MD2,
POLARSSL_MD_MD4,
POLARSSL_MD_MD5,
POLARSSL_MD_SHA1,
POLARSSL_MD_SHA224,
POLARSSL_MD_SHA256,
POLARSSL_MD_SHA384,
POLARSSL_MD_SHA512,
} md_type_t;
#define POLARSSL_MD_MAX_SIZE 64 /* longest known is SHA512 */
/**
* Message digest information. Allows message digest functions to be called
* in a generic way.
*/
typedef struct {
/** Digest identifier */
md_type_t type;
/** Name of the message digest */
const char * name;
/** Output length of the digest function */
int size;
/** Digest initialisation function */
void (*starts_func)( void *ctx );
/** Digest update function */
void (*update_func)( void *ctx, const unsigned char *input, size_t ilen );
/** Digest finalisation function */
void (*finish_func)( void *ctx, unsigned char *output );
/** Generic digest function */
void (*digest_func)( const unsigned char *input, size_t ilen,
unsigned char *output );
/** Generic file digest function */
int (*file_func)( const char *path, unsigned char *output );
/** HMAC Initialisation function */
void (*hmac_starts_func)( void *ctx, const unsigned char *key, size_t keylen );
/** HMAC update function */
void (*hmac_update_func)( void *ctx, const unsigned char *input, size_t ilen );
/** HMAC finalisation function */
void (*hmac_finish_func)( void *ctx, unsigned char *output);
/** HMAC context reset function */
void (*hmac_reset_func)( void *ctx );
/** Generic HMAC function */
void (*hmac_func)( const unsigned char *key, size_t keylen,
const unsigned char *input, size_t ilen,
unsigned char *output );
/** Allocate a new context */
void * (*ctx_alloc_func)( void );
/** Free the given context */
void (*ctx_free_func)( void *ctx );
} md_info_t;
/**
* Generic message digest context.
*/
typedef struct {
/** Information about the associated message digest */
const md_info_t *md_info;
/** Digest-specific context */
void *md_ctx;
} md_context_t;
#define MD_CONTEXT_T_INIT { \
NULL, /* md_info */ \
NULL, /* md_ctx */ \
}
#ifdef __cplusplus
extern "C" {
#endif
/**
* \brief Returns the list of digests supported by the generic digest module.
*
* \return a statically allocated array of digests, the last entry
* is 0.
*/
const int *md_list( void );
/**
* \brief Returns the message digest information associated with the
* given digest name.
*
* \param md_name Name of the digest to search for.
*
* \return The message digest information associated with md_name or
* NULL if not found.
*/
const md_info_t *md_info_from_string( const char *md_name );
/**
* \brief Returns the message digest information associated with the
* given digest type.
*
* \param md_type type of digest to search for.
*
* \return The message digest information associated with md_type or
* NULL if not found.
*/
const md_info_t *md_info_from_type( md_type_t md_type );
/**
* \brief Initialises and fills the message digest context structure with
* the appropriate values.
*
* \param ctx context to initialise. May not be NULL. The
* digest-specific context (ctx->md_ctx) must be NULL. It will
* be allocated, and must be freed using md_free_ctx() later.
* \param md_info message digest to use.
*
* \returns \c 0 on success, \c POLARSSL_ERR_MD_BAD_INPUT_DATA on
* parameter failure, \c POLARSSL_ERR_MD_ALLOC_FAILED if
* allocation of the digest-specific context failed.
*/
int md_init_ctx( md_context_t *ctx, const md_info_t *md_info );
/**
* \brief Free the message-specific context of ctx. Freeing ctx itself
* remains the responsibility of the caller.
*
* \param ctx Free the message-specific context
*
* \returns 0 on success, POLARSSL_ERR_MD_BAD_INPUT_DATA if parameter
* verification fails.
*/
int md_free_ctx( md_context_t *ctx );
/**
* \brief Returns the size of the message digest output.
*
* \param md_info message digest info
*
* \return size of the message digest output.
*/
static inline unsigned char md_get_size( const md_info_t *md_info )
{
return md_info->size;
}
/**
* \brief Returns the type of the message digest output.
*
* \param md_info message digest info
*
* \return type of the message digest output.
*/
static inline md_type_t md_get_type( const md_info_t *md_info )
{
return md_info->type;
}
/**
* \brief Returns the name of the message digest output.
*
* \param md_info message digest info
*
* \return name of the message digest output.
*/
static inline const char *md_get_name( const md_info_t *md_info )
{
return md_info->name;
}
/**
* \brief Set-up the given context for a new message digest
*
* \param ctx generic message digest context.
*
* \returns 0 on success, POLARSSL_ERR_MD_BAD_INPUT_DATA if parameter
* verification fails.
*/
int md_starts( md_context_t *ctx );
/**
* \brief Generic message digest process buffer
*
* \param ctx Generic message digest context
* \param input buffer holding the datal
* \param ilen length of the input data
*
* \returns 0 on success, POLARSSL_ERR_MD_BAD_INPUT_DATA if parameter
* verification fails.
*/
int md_update( md_context_t *ctx, const unsigned char *input, size_t ilen );
/**
* \brief Generic message digest final digest
*
* \param ctx Generic message digest context
* \param output Generic message digest checksum result
*
* \returns 0 on success, POLARSSL_ERR_MD_BAD_INPUT_DATA if parameter
* verification fails.
*/
int md_finish( md_context_t *ctx, unsigned char *output );
/**
* \brief Output = message_digest( input buffer )
*
* \param md_info message digest info
* \param input buffer holding the data
* \param ilen length of the input data
* \param output Generic message digest checksum result
*
* \returns 0 on success, POLARSSL_ERR_MD_BAD_INPUT_DATA if parameter
* verification fails.
*/
int md( const md_info_t *md_info, const unsigned char *input, size_t ilen,
unsigned char *output );
/**
* \brief Output = message_digest( file contents )
*
* \param md_info message digest info
* \param path input file name
* \param output generic message digest checksum result
*
* \return 0 if successful, POLARSSL_ERR_MD_FILE_OPEN_FAILED if fopen
* failed, POLARSSL_ERR_MD_FILE_READ_FAILED if fread failed,
* POLARSSL_ERR_MD_BAD_INPUT_DATA if md_info was NULL.
*/
int md_file( const md_info_t *md_info, const char *path, unsigned char *output );
/**
* \brief Generic HMAC context setup
*
* \param ctx HMAC context to be initialized
* \param key HMAC secret key
* \param keylen length of the HMAC key
*
* \returns 0 on success, POLARSSL_ERR_MD_BAD_INPUT_DATA if parameter
* verification fails.
*/
int md_hmac_starts( md_context_t *ctx, const unsigned char *key, size_t keylen );
/**
* \brief Generic HMAC process buffer
*
* \param ctx HMAC context
* \param input buffer holding the data
* \param ilen length of the input data
*
* \returns 0 on success, POLARSSL_ERR_MD_BAD_INPUT_DATA if parameter
* verification fails.
*/
int md_hmac_update( md_context_t *ctx, const unsigned char *input, size_t ilen );
/**
* \brief Generic HMAC final digest
*
* \param ctx HMAC context
* \param output Generic HMAC checksum result
*
* \returns 0 on success, POLARSSL_ERR_MD_BAD_INPUT_DATA if parameter
* verification fails.
*/
int md_hmac_finish( md_context_t *ctx, unsigned char *output);
/**
* \brief Generic HMAC context reset
*
* \param ctx HMAC context to be reset
*
* \returns 0 on success, POLARSSL_ERR_MD_BAD_INPUT_DATA if parameter
* verification fails.
*/
int md_hmac_reset( md_context_t *ctx );
/**
* \brief Output = Generic_HMAC( hmac key, input buffer )
*
* \param md_info message digest info
* \param key HMAC secret key
* \param keylen length of the HMAC key
* \param input buffer holding the data
* \param ilen length of the input data
* \param output Generic HMAC-result
*
* \returns 0 on success, POLARSSL_ERR_MD_BAD_INPUT_DATA if parameter
* verification fails.
*/
int md_hmac( const md_info_t *md_info, const unsigned char *key, size_t keylen,
const unsigned char *input, size_t ilen,
unsigned char *output );
#ifdef __cplusplus
}
#endif
#endif /* POLARSSL_MD_H */