/** * \file md.h * * \brief Generic message digest wrapper * * \author Adriaan de Jong * * Copyright (C) 2006-2010, Brainspark B.V. * * This file is part of PolarSSL (http://www.polarssl.org) * Lead Maintainer: Paul Bakker * * 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 typedef enum { POLARSSL_MD_MD2=0, POLARSSL_MD_MD4, POLARSSL_MD_MD5, POLARSSL_MD_SHA1, POLARSSL_MD_SHA224, POLARSSL_MD_SHA256, POLARSSL_MD_SHA384, POLARSSL_MD_SHA512, } md_type_t; /** * 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, int ilen ); /** Digest finalisation function */ void (*finish_func)( void *ctx, unsigned char *output ); /** Generic digest function */ void (*digest_func)( const unsigned char *input, int 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, int keylen ); /** HMAC update function */ void (*hmac_update_func)( void *ctx, const unsigned char *input, int 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, int keylen, const unsigned char *input, int 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 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 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 Generic message digest context setup. * * \param md_info message digest info * \param ctx generic message digest context. 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() later. * * \returns 0 on success, 1 if parameter verification fails. */ int md_starts( const md_info_t *md_info, 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, 1 if parameter verification fails. */ int md_update( md_context_t *ctx, const unsigned char *input, int ilen ); /** * \brief Generic message digest final digest * * \param ctx Generic message digest context * \param output Generic message digest checksum result * * \returns 0 on success, 1 if parameter verification fails. */ int md_finish( md_context_t *ctx, unsigned char *output ); /** * \brief Free the message-specific context of ctx. Freeing ctx itself * remains the responsibility of the caller. * * \param ctx Free the -specific context * \param output Generic message digest checksum result * * \returns 0 on success, 1 if parameter verification fails. */ int md_free_ctx( md_context_t *ctx ); /** * \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, 1 if parameter verification fails. */ int md( const md_info_t *md_info, const unsigned char *input, int 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, 1 if fopen failed, * 2 if fread failed, 3 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 md_info message digest info * \param ctx HMAC context to be initialized * \param key HMAC secret key * \param keylen length of the HMAC key * * \returns 0 on success, 1 if parameter verification fails. */ int md_hmac_starts( const md_info_t *md_info, md_context_t *ctx, const unsigned char *key, int 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, 1 if parameter verification fails. */ int md_hmac_update( md_context_t *ctx, const unsigned char *input, int ilen ); /** * \brief Generic HMAC final digest * * \param ctx HMAC context * \param output Generic HMAC checksum result * * \returns 0 on success, 1 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, 1 if ctx is NULL. */ 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, 1 if parameter verification fails. */ int md_hmac( const md_info_t *md_info, const unsigned char *key, int keylen, const unsigned char *input, int ilen, unsigned char *output ); #ifdef __cplusplus } #endif #endif /* POLARSSL_MD_H */