/* crypto/evp/evp_key.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 "cryptlib.h"

#include <openssl/x509.h>

#include <openssl/objects.h>

#include <openssl/evp.h>

#include <openssl/ui.h>

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

#include "libcrypto_wsd_macros.h"

#include "libcrypto_wsd.h"

#endif

#ifndef EMULATOR

/* should be init to zeros. */

static char prompt_string[80];

#else

GET_STATIC_ARRAY_FROM_TLS(prompt_string,evp_key,char)

#define prompt_string (GET_WSD_VAR_NAME(prompt_string,evp_key, s)())

#endif

EXPORT_C void EVP_set_pw_prompt(const char *prompt)

	{

	if (prompt == NULL)

		prompt_string[0]='\0';

	else

		{

		strncpy(prompt_string,prompt,79);

		prompt_string[79]='\0';

		}

	}

EXPORT_C char *EVP_get_pw_prompt(void)

	{

	if (prompt_string[0] == '\0')

		return(NULL);

	else

		return(prompt_string);

	}

/* For historical reasons, the standard function for reading passwords is

 * in the DES library -- if someone ever wants to disable DES,

 * this function will fail */

EXPORT_C int EVP_read_pw_string(char *buf, int len, const char *prompt, int verify)

	{

	int ret;

	char buff[BUFSIZ];

	UI *ui;

	if ((prompt == NULL) && (prompt_string[0] != '\0'))

		prompt=prompt_string;

	ui = UI_new();

	UI_add_input_string(ui,prompt,0,buf,0,(len>=BUFSIZ)?BUFSIZ-1:len);

	if (verify)

		UI_add_verify_string(ui,prompt,0,

			buff,0,(len>=BUFSIZ)?BUFSIZ-1:len,buf);

	ret = UI_process(ui);

	UI_free(ui);

	OPENSSL_cleanse(buff,BUFSIZ);

	return ret;

	}

EXPORT_C int EVP_BytesToKey(const EVP_CIPHER *type, const EVP_MD *md, 

	     const unsigned char *salt, const unsigned char *data, int datal,

	     int count, unsigned char *key, unsigned char *iv)

	{

	EVP_MD_CTX c;

	unsigned char md_buf[EVP_MAX_MD_SIZE];

	int niv,nkey,addmd=0;

	unsigned int mds=0,i;

	nkey=type->key_len;

	niv=type->iv_len;

	OPENSSL_assert(nkey <= EVP_MAX_KEY_LENGTH);

	OPENSSL_assert(niv <= EVP_MAX_IV_LENGTH);

	if (data == NULL) return(nkey);

	EVP_MD_CTX_init(&c);

	for (;;)

		{

		if (!EVP_DigestInit_ex(&c,md, NULL))

		return 0;

  	if (addmd++)

			EVP_DigestUpdate(&c,&(md_buf[0]),mds);

		EVP_DigestUpdate(&c,data,datal);

		if (salt != NULL)

			EVP_DigestUpdate(&c,salt,PKCS5_SALT_LEN);

		EVP_DigestFinal_ex(&c,&(md_buf[0]),&mds);

		for (i=1; i<(unsigned int)count; i++)

			{

			EVP_DigestInit_ex(&c,md, NULL);

			EVP_DigestUpdate(&c,&(md_buf[0]),mds);

			EVP_DigestFinal_ex(&c,&(md_buf[0]),&mds);

			}

		i=0;

		if (nkey)

			{

			for (;;)

				{

				if (nkey == 0) break;

				if (i == mds) break;

				if (key != NULL)

					*(key++)=md_buf[i];

				nkey--;

				i++;

				}

			}

		if (niv && (i != mds))

			{

			for (;;)

				{

				if (niv == 0) break;

				if (i == mds) break;

				if (iv != NULL)

					*(iv++)=md_buf[i];

				niv--;

				i++;

				}

			}

		if ((nkey == 0) && (niv == 0)) break;

		}

	EVP_MD_CTX_cleanup(&c);

	OPENSSL_cleanse(&(md_buf[0]),EVP_MAX_MD_SIZE);

	return(type->key_len);

	}