sl@0: /* crypto/hmac/hmac.c */
sl@0: /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
sl@0:  * All rights reserved.
sl@0:  *
sl@0:  * This package is an SSL implementation written
sl@0:  * by Eric Young (eay@cryptsoft.com).
sl@0:  * The implementation was written so as to conform with Netscapes SSL.
sl@0:  * 
sl@0:  * This library is free for commercial and non-commercial use as long as
sl@0:  * the following conditions are aheared to.  The following conditions
sl@0:  * apply to all code found in this distribution, be it the RC4, RSA,
sl@0:  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
sl@0:  * included with this distribution is covered by the same copyright terms
sl@0:  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
sl@0:  * 
sl@0:  * Copyright remains Eric Young's, and as such any Copyright notices in
sl@0:  * the code are not to be removed.
sl@0:  * If this package is used in a product, Eric Young should be given attribution
sl@0:  * as the author of the parts of the library used.
sl@0:  * This can be in the form of a textual message at program startup or
sl@0:  * in documentation (online or textual) provided with the package.
sl@0:  * 
sl@0:  * Redistribution and use in source and binary forms, with or without
sl@0:  * modification, are permitted provided that the following conditions
sl@0:  * are met:
sl@0:  * 1. Redistributions of source code must retain the copyright
sl@0:  *    notice, this list of conditions and the following disclaimer.
sl@0:  * 2. Redistributions in binary form must reproduce the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer in the
sl@0:  *    documentation and/or other materials provided with the distribution.
sl@0:  * 3. All advertising materials mentioning features or use of this software
sl@0:  *    must display the following acknowledgement:
sl@0:  *    "This product includes cryptographic software written by
sl@0:  *     Eric Young (eay@cryptsoft.com)"
sl@0:  *    The word 'cryptographic' can be left out if the rouines from the library
sl@0:  *    being used are not cryptographic related :-).
sl@0:  * 4. If you include any Windows specific code (or a derivative thereof) from 
sl@0:  *    the apps directory (application code) you must include an acknowledgement:
sl@0:  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
sl@0:  * 
sl@0:  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
sl@0:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
sl@0:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
sl@0:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
sl@0:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
sl@0:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
sl@0:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
sl@0:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
sl@0:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
sl@0:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
sl@0:  * SUCH DAMAGE.
sl@0:  * 
sl@0:  * The licence and distribution terms for any publically available version or
sl@0:  * derivative of this code cannot be changed.  i.e. this code cannot simply be
sl@0:  * copied and put under another distribution licence
sl@0:  * [including the GNU Public Licence.]
sl@0:  */
sl@0:  /*
sl@0:  © Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.
sl@0:  */
sl@0: 
sl@0: #include <stdio.h>
sl@0: #include <stdlib.h>
sl@0: #include <string.h>
sl@0: #include "cryptlib.h"
sl@0: #include <openssl/hmac.h>
sl@0: #ifdef SYMBIAN
sl@0: #include <errno.h>
sl@0: #endif
sl@0: #if (defined(SYMBIAN) && (defined(__WINSCW__) || defined(__WINS__)))
sl@0: #include "libcrypto_wsd_macros.h"
sl@0: #include "libcrypto_wsd.h"
sl@0: #endif
sl@0: 
sl@0: 
sl@0: EXPORT_C void HMAC_Init_ex(HMAC_CTX *ctx, const void *key, int len,
sl@0: 		  const EVP_MD *md, ENGINE *impl)
sl@0: 	{
sl@0: 	int i,j,reset=0;
sl@0: 	unsigned char pad[HMAC_MAX_MD_CBLOCK];
sl@0: 
sl@0: 	if (md != NULL)
sl@0: 		{
sl@0: 		reset=1;
sl@0: 		ctx->md=md;
sl@0: 		}
sl@0: 	else
sl@0: 		md=ctx->md;
sl@0: 
sl@0: 	if (key != NULL)
sl@0: 		{
sl@0: 		reset=1;
sl@0: 		j=EVP_MD_block_size(md);
sl@0: 		OPENSSL_assert(j <= (int)sizeof(ctx->key));
sl@0: 		if (j < len)
sl@0: 			{
sl@0: 			EVP_DigestInit_ex(&ctx->md_ctx,md, impl);
sl@0: 			EVP_DigestUpdate(&ctx->md_ctx,key,len);
sl@0: 			EVP_DigestFinal_ex(&(ctx->md_ctx),ctx->key,
sl@0: 				&ctx->key_length);
sl@0: 			}
sl@0: 		else
sl@0: 			{
sl@0: 			OPENSSL_assert(len>=0 && len<=(int)sizeof(ctx->key));
sl@0: 			memcpy(ctx->key,key,len);
sl@0: 			ctx->key_length=len;
sl@0: 			}
sl@0: 		if(ctx->key_length != HMAC_MAX_MD_CBLOCK)
sl@0: 			memset(&ctx->key[ctx->key_length], 0,
sl@0: 				HMAC_MAX_MD_CBLOCK - ctx->key_length);
sl@0: 		}
sl@0: 
sl@0: 	if (reset)	
sl@0: 		{
sl@0: 		for (i=0; i<HMAC_MAX_MD_CBLOCK; i++)
sl@0: 			pad[i]=0x36^ctx->key[i];
sl@0: 		EVP_DigestInit_ex(&ctx->i_ctx,md, impl);
sl@0: 		EVP_DigestUpdate(&ctx->i_ctx,pad,EVP_MD_block_size(md));
sl@0: 
sl@0: 		for (i=0; i<HMAC_MAX_MD_CBLOCK; i++)
sl@0: 			pad[i]=0x5c^ctx->key[i];
sl@0: 		EVP_DigestInit_ex(&ctx->o_ctx,md, impl);
sl@0: 		EVP_DigestUpdate(&ctx->o_ctx,pad,EVP_MD_block_size(md));
sl@0: 		}
sl@0: 	EVP_MD_CTX_copy_ex(&ctx->md_ctx,&ctx->i_ctx);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C void HMAC_Init(HMAC_CTX *ctx, const void *key, int len,
sl@0: 	       const EVP_MD *md)
sl@0: 	{
sl@0: 	if(key && md)
sl@0: 	    HMAC_CTX_init(ctx);
sl@0: 	HMAC_Init_ex(ctx,key,len,md, NULL);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C void HMAC_Update(HMAC_CTX *ctx, const unsigned char *data, size_t len)
sl@0: 	{
sl@0: 	EVP_DigestUpdate(&ctx->md_ctx,data,len);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C void HMAC_Final(HMAC_CTX *ctx, unsigned char *md, unsigned int *len)
sl@0: 	{
sl@0: 	int j;
sl@0: 	unsigned int i;
sl@0: 	unsigned char buf[EVP_MAX_MD_SIZE];
sl@0: 
sl@0: 	j=EVP_MD_block_size(ctx->md);
sl@0: 
sl@0: 	EVP_DigestFinal_ex(&ctx->md_ctx,buf,&i);
sl@0: 	EVP_MD_CTX_copy_ex(&ctx->md_ctx,&ctx->o_ctx);
sl@0: 	EVP_DigestUpdate(&ctx->md_ctx,buf,i);
sl@0: 	EVP_DigestFinal_ex(&ctx->md_ctx,md,len);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C void HMAC_CTX_init(HMAC_CTX *ctx)
sl@0: 	{
sl@0: 	EVP_MD_CTX_init(&ctx->i_ctx);
sl@0: 	EVP_MD_CTX_init(&ctx->o_ctx);
sl@0: 	EVP_MD_CTX_init(&ctx->md_ctx);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C void HMAC_CTX_cleanup(HMAC_CTX *ctx)
sl@0: 	{
sl@0: 	EVP_MD_CTX_cleanup(&ctx->i_ctx);
sl@0: 	EVP_MD_CTX_cleanup(&ctx->o_ctx);
sl@0: 	EVP_MD_CTX_cleanup(&ctx->md_ctx);
sl@0: 	memset(ctx,0,sizeof *ctx);
sl@0: 	}
sl@0: 
sl@0: #ifdef EMULATOR
sl@0: GET_STATIC_ARRAY_FROM_TLS(m,hmac,unsigned char)
sl@0: #define m (GET_WSD_VAR_NAME(m,hmac, s)())	
sl@0: #endif
sl@0: 
sl@0: EXPORT_C unsigned char *HMAC(const EVP_MD *evp_md, const void *key, int key_len,
sl@0: 		    const unsigned char *d, size_t n, unsigned char *md,
sl@0: 		    unsigned int *md_len)
sl@0: 	{
sl@0: 	HMAC_CTX c;
sl@0: #ifdef SYMBIAN	
sl@0: 	int save_errno=0;
sl@0: #endif	
sl@0: #ifndef EMULATOR	
sl@0: 	static unsigned char m[EVP_MAX_MD_SIZE];
sl@0: #endif	
sl@0: #ifdef SYMBIAN	
sl@0:   save_errno=errno; //save errno..
sl@0:   errno = 0; //clear it for now
sl@0: #endif  
sl@0: 	if (md == NULL) md=m;
sl@0: 	HMAC_CTX_init(&c);
sl@0: 	HMAC_Init(&c,key,key_len,evp_md);
sl@0: #ifdef SYMBIAN	
sl@0:   if(errno==ENOMEM)
sl@0:   {
sl@0:   	return md;
sl@0:   }
sl@0: #endif  
sl@0: 	HMAC_Update(&c,d,n);
sl@0: #ifdef SYMBIAN	
sl@0:   if(errno==ENOMEM)
sl@0:   {
sl@0:     return md;
sl@0:   }
sl@0: #endif  
sl@0: 	HMAC_Final(&c,md,md_len);
sl@0: 	HMAC_CTX_cleanup(&c);
sl@0: #ifdef SYMBIAN
sl@0:    if(errno==0)   
sl@0:    errno = save_errno; //reset back errno to what it was prreviously only if it has not changed now
sl@0: #endif
sl@0: 	return(md);
sl@0: 	}
sl@0: