diff --git a/include/polarssl/md.h b/include/polarssl/md.h
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+++ b/include/polarssl/md.h
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+/**
+ * \file md.h
+ * 
+ * \brief Generic message digest wrapper
+ *
+ * \author Adriaan de Jong <dejong@fox-it.com>
+ *
+ *  Copyright (C) 2006-2010, 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
+
+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 */