/* crypto/evp/bio_md.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 <errno.h>

#include "cryptlib.h"

#include <openssl/buffer.h>

#include <openssl/evp.h>

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

#include "libcrypto_wsd_macros.h"

#include "libcrypto_wsd.h"

#endif

/* BIO_put and BIO_get both add to the digest,

 * BIO_gets returns the digest */

static int md_write(BIO *h, char const *buf, int num);

static int md_read(BIO *h, char *buf, int size);

/*static int md_puts(BIO *h, const char *str); */

static int md_gets(BIO *h, char *str, int size);

static long md_ctrl(BIO *h, int cmd, long arg1, void *arg2);

static int md_new(BIO *h);

static int md_free(BIO *data);

static long md_callback_ctrl(BIO *h,int cmd,bio_info_cb *fp);

#ifndef EMULATOR

static BIO_METHOD methods_md=

	{

	BIO_TYPE_MD,"message digest",

	md_write,

	md_read,

	NULL, /* md_puts, */

	md_gets,

	md_ctrl,

	md_new,

	md_free,

	md_callback_ctrl,

	};

#else

GET_STATIC_VAR_FROM_TLS(methods_md,bio_md,BIO_METHOD)

#define methods_md (*GET_WSD_VAR_NAME(methods_md,bio_md, s)())

const BIO_METHOD temp_s_methods_md=

	{

	BIO_TYPE_MD,"message digest",

	md_write,

	md_read,

	NULL, /* md_puts, */

	md_gets,

	md_ctrl,

	md_new,

	md_free,

	md_callback_ctrl,

	};

#endif

EXPORT_C BIO_METHOD *BIO_f_md(void)

	{

	return(&methods_md);

	}

static int md_new(BIO *bi)

	{

	EVP_MD_CTX *ctx;

	ctx=EVP_MD_CTX_create();

	if (ctx == NULL) return(0);

	bi->init=0;

	bi->ptr=(char *)ctx;

	bi->flags=0;

	return(1);

	}

static int md_free(BIO *a)

	{

	if (a == NULL) return(0);

	EVP_MD_CTX_destroy(a->ptr);

	a->ptr=NULL;

	a->init=0;

	a->flags=0;

	return(1);

	}

static int md_read(BIO *b, char *out, int outl)

	{

	int ret=0;

	EVP_MD_CTX *ctx;

	if (out == NULL) return(0);

	ctx=b->ptr;

	if ((ctx == NULL) || (b->next_bio == NULL)) return(0);

	ret=BIO_read(b->next_bio,out,outl);

	if (b->init)

		{

		if (ret > 0)

			{

			EVP_DigestUpdate(ctx,(unsigned char *)out,

				(unsigned int)ret);

			}

		}

	BIO_clear_retry_flags(b);

	BIO_copy_next_retry(b);

	return(ret);

	}

static int md_write(BIO *b, const char *in, int inl)

	{

	int ret=0;

	EVP_MD_CTX *ctx;

	if ((in == NULL) || (inl <= 0)) return(0);

	ctx=b->ptr;

	if ((ctx != NULL) && (b->next_bio != NULL))

		ret=BIO_write(b->next_bio,in,inl);

	if (b->init)

		{

		if (ret > 0)

			{

			EVP_DigestUpdate(ctx,(const unsigned char *)in,

				(unsigned int)ret);

			}

		}

	BIO_clear_retry_flags(b);

	BIO_copy_next_retry(b);

	return(ret);

	}

static long md_ctrl(BIO *b, int cmd, long num, void *ptr)

	{

	EVP_MD_CTX *ctx,*dctx,**pctx;

	const EVP_MD **ppmd;

	EVP_MD *md;

	long ret=1;

	BIO *dbio;

	ctx=b->ptr;

	switch (cmd)

		{

	case BIO_CTRL_RESET:

		if (b->init)

			ret = EVP_DigestInit_ex(ctx,ctx->digest, NULL);

		else

			ret=0;

		if (ret > 0)

			ret=BIO_ctrl(b->next_bio,cmd,num,ptr);

		break;

	case BIO_C_GET_MD:

		if (b->init)

			{

			ppmd=ptr;

			*ppmd=ctx->digest;

			}

		else

			ret=0;

		break;

	case BIO_C_GET_MD_CTX:

		if (b->init)

			{

			pctx=ptr;

			*pctx=ctx;

			}

		else

			ret=0;

		break;

	case BIO_C_SET_MD_CTX:

		if (b->init)

			b->ptr=ptr;

		else

			ret=0;

		break;

	case BIO_C_DO_STATE_MACHINE:

		BIO_clear_retry_flags(b);

		ret=BIO_ctrl(b->next_bio,cmd,num,ptr);

		BIO_copy_next_retry(b);

		break;

	case BIO_C_SET_MD:

		md=ptr;

		ret = EVP_DigestInit_ex(ctx,md, NULL);

		if (ret > 0)

			b->init=1;

		break;

	case BIO_CTRL_DUP:

		dbio=ptr;

		dctx=dbio->ptr;

		EVP_MD_CTX_copy_ex(dctx,ctx);

		b->init=1;

		break;

	default:

		ret=BIO_ctrl(b->next_bio,cmd,num,ptr);

		break;

		}

	return(ret);

	}

static long md_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)

	{

	long ret=1;

	if (b->next_bio == NULL) return(0);

	switch (cmd)

		{

	default:

		ret=BIO_callback_ctrl(b->next_bio,cmd,fp);

		break;

		}

	return(ret);

	}

static int md_gets(BIO *bp, char *buf, int size)

	{

	EVP_MD_CTX *ctx;

	unsigned int ret;

	ctx=bp->ptr;

	if (size < ctx->digest->md_size)

		return(0);

	EVP_DigestFinal_ex(ctx,(unsigned char *)buf,&ret);

	return((int)ret);

	}

/*

static int md_puts(bp,str)

BIO *bp;

char *str;

	{

	return(-1);

	}

*/