/* 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);

 	}