/* crypto/hmac/hmac.c */

/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)

 * All rights reserved.

 *

 * This package is an SSL implementation written

 * by Eric Young (eay@cryptsoft.com).

 * The implementation was written so as to conform with Netscapes SSL.

 * 

 * This library is free for commercial and non-commercial use as long as

 * the following conditions are aheared to.  The following conditions

 * apply to all code found in this distribution, be it the RC4, RSA,

 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation

 * included with this distribution is covered by the same copyright terms

 * except that the holder is Tim Hudson (tjh@cryptsoft.com).

 * 

 * Copyright remains Eric Young's, and as such any Copyright notices in

 * the code are not to be removed.

 * If this package is used in a product, Eric Young should be given attribution

 * as the author of the parts of the library used.

 * This can be in the form of a textual message at program startup or

 * in documentation (online or textual) provided with the package.

 * 

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. All advertising materials mentioning features or use of this software

 *    must display the following acknowledgement:

 *    "This product includes cryptographic software written by

 *     Eric Young (eay@cryptsoft.com)"

 *    The word 'cryptographic' can be left out if the rouines from the library

 *    being used are not cryptographic related :-).

 * 4. If you include any Windows specific code (or a derivative thereof) from 

 *    the apps directory (application code) you must include an acknowledgement:

 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"

 * 

 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 * 

 * The licence and distribution terms for any publically available version or

 * derivative of this code cannot be changed.  i.e. this code cannot simply be

 * copied and put under another distribution licence

 * [including the GNU Public Licence.]

 */

 /*

 © Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.

 */

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include "cryptlib.h"

#include <openssl/hmac.h>

#ifdef SYMBIAN

#include <errno.h>

#endif

#if (defined(SYMBIAN) && (defined(__WINSCW__) || defined(__WINS__)))

#include "libcrypto_wsd_macros.h"

#include "libcrypto_wsd.h"

#endif

EXPORT_C void HMAC_Init_ex(HMAC_CTX *ctx, const void *key, int len,

		  const EVP_MD *md, ENGINE *impl)

	{

	int i,j,reset=0;

	unsigned char pad[HMAC_MAX_MD_CBLOCK];

	if (md != NULL)

		{

		reset=1;

		ctx->md=md;

		}

	else

		md=ctx->md;

	if (key != NULL)

		{

		reset=1;

		j=EVP_MD_block_size(md);

		OPENSSL_assert(j <= (int)sizeof(ctx->key));

		if (j < len)

			{

			EVP_DigestInit_ex(&ctx->md_ctx,md, impl);

			EVP_DigestUpdate(&ctx->md_ctx,key,len);

			EVP_DigestFinal_ex(&(ctx->md_ctx),ctx->key,

				&ctx->key_length);

			}

		else

			{

			OPENSSL_assert(len>=0 && len<=(int)sizeof(ctx->key));

			memcpy(ctx->key,key,len);

			ctx->key_length=len;

			}

		if(ctx->key_length != HMAC_MAX_MD_CBLOCK)

			memset(&ctx->key[ctx->key_length], 0,

				HMAC_MAX_MD_CBLOCK - ctx->key_length);

		}

	if (reset)	

		{

		for (i=0; i<HMAC_MAX_MD_CBLOCK; i++)

			pad[i]=0x36^ctx->key[i];

		EVP_DigestInit_ex(&ctx->i_ctx,md, impl);

		EVP_DigestUpdate(&ctx->i_ctx,pad,EVP_MD_block_size(md));

		for (i=0; i<HMAC_MAX_MD_CBLOCK; i++)

			pad[i]=0x5c^ctx->key[i];

		EVP_DigestInit_ex(&ctx->o_ctx,md, impl);

		EVP_DigestUpdate(&ctx->o_ctx,pad,EVP_MD_block_size(md));

		}

	EVP_MD_CTX_copy_ex(&ctx->md_ctx,&ctx->i_ctx);

	}

EXPORT_C void HMAC_Init(HMAC_CTX *ctx, const void *key, int len,

	       const EVP_MD *md)

	{

	if(key && md)

	    HMAC_CTX_init(ctx);

	HMAC_Init_ex(ctx,key,len,md, NULL);

	}

EXPORT_C void HMAC_Update(HMAC_CTX *ctx, const unsigned char *data, size_t len)

	{

	EVP_DigestUpdate(&ctx->md_ctx,data,len);

	}

EXPORT_C void HMAC_Final(HMAC_CTX *ctx, unsigned char *md, unsigned int *len)

	{

	int j;

	unsigned int i;

	unsigned char buf[EVP_MAX_MD_SIZE];

	j=EVP_MD_block_size(ctx->md);

	EVP_DigestFinal_ex(&ctx->md_ctx,buf,&i);

	EVP_MD_CTX_copy_ex(&ctx->md_ctx,&ctx->o_ctx);

	EVP_DigestUpdate(&ctx->md_ctx,buf,i);

	EVP_DigestFinal_ex(&ctx->md_ctx,md,len);

	}

EXPORT_C void HMAC_CTX_init(HMAC_CTX *ctx)

	{

	EVP_MD_CTX_init(&ctx->i_ctx);

	EVP_MD_CTX_init(&ctx->o_ctx);

	EVP_MD_CTX_init(&ctx->md_ctx);

	}

EXPORT_C void HMAC_CTX_cleanup(HMAC_CTX *ctx)

	{

	EVP_MD_CTX_cleanup(&ctx->i_ctx);

	EVP_MD_CTX_cleanup(&ctx->o_ctx);

	EVP_MD_CTX_cleanup(&ctx->md_ctx);

	memset(ctx,0,sizeof *ctx);

	}

#ifdef EMULATOR

GET_STATIC_ARRAY_FROM_TLS(m,hmac,unsigned char)

#define m (GET_WSD_VAR_NAME(m,hmac, s)())	

#endif

EXPORT_C unsigned char *HMAC(const EVP_MD *evp_md, const void *key, int key_len,

		    const unsigned char *d, size_t n, unsigned char *md,

		    unsigned int *md_len)

	{

	HMAC_CTX c;

#ifdef SYMBIAN	

	int save_errno=0;

#endif	

#ifndef EMULATOR	

	static unsigned char m[EVP_MAX_MD_SIZE];

#endif	

#ifdef SYMBIAN	

  save_errno=errno; //save errno..

  errno = 0; //clear it for now

#endif  

	if (md == NULL) md=m;

	HMAC_CTX_init(&c);

	HMAC_Init(&c,key,key_len,evp_md);

#ifdef SYMBIAN	

  if(errno==ENOMEM)

  {

  	return md;

  }

#endif  

	HMAC_Update(&c,d,n);

#ifdef SYMBIAN	

  if(errno==ENOMEM)

  {

    return md;

  }

#endif  

	HMAC_Final(&c,md,md_len);

	HMAC_CTX_cleanup(&c);

#ifdef SYMBIAN

   if(errno==0)   

   errno = save_errno; //reset back errno to what it was prreviously only if it has not changed now

#endif

	return(md);

	}