/* 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);

 	}