[thirdparty/openssl.git] / crypto / evp / evp_key.c

/* 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.]
 */

#include <stdio.h>
#include "cryptlib.h"
#include <openssl/x509.h>
#include <openssl/objects.h>
#include <openssl/evp.h>

/* should be init to zeros. */
static char prompt_string[80];

void EVP_set_pw_prompt(char *prompt)
	{
	if (prompt == NULL)
		prompt_string[0]='\0';
	else
		strncpy(prompt_string,prompt,79);
	}

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 */
int EVP_read_pw_string(char *buf, int len, const char *prompt, int verify)
	{
#ifndef OPENSSL_NO_DES
	if ((prompt == NULL) && (prompt_string[0] != '\0'))
		prompt=prompt_string;
	return(des_read_pw_string(buf,len,prompt,verify));
#else
	return -1;
#endif
	}

int EVP_BytesToKey(const EVP_CIPHER *type, const EVP_MD *md, unsigned char *salt,
	     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;

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

	for (;;)
		{
		EVP_DigestInit(&c,md);
		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(&c,&(md_buf[0]),&mds);

		for (i=1; i<(unsigned int)count; i++)
			{
			EVP_DigestInit(&c,md);
			EVP_DigestUpdate(&c,&(md_buf[0]),mds);
			EVP_DigestFinal(&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;
		}
	memset(&c,0,sizeof(c));
	memset(&(md_buf[0]),0,EVP_MAX_MD_SIZE);
	return(type->key_len);
	}
Commit	Line	Data
d02b48c6	1	/* crypto/evp/evp_key.c */
58964a49	2	/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
d02b48c6 RE	3	* All rights reserved.
	4	*
	5	* This package is an SSL implementation written
	6	* by Eric Young (eay@cryptsoft.com).
	7	* The implementation was written so as to conform with Netscapes SSL.
	8	*
	9	* This library is free for commercial and non-commercial use as long as
	10	* the following conditions are aheared to. The following conditions
	11	* apply to all code found in this distribution, be it the RC4, RSA,
	12	* lhash, DES, etc., code; not just the SSL code. The SSL documentation
	13	* included with this distribution is covered by the same copyright terms
	14	* except that the holder is Tim Hudson (tjh@cryptsoft.com).
	15	*
	16	* Copyright remains Eric Young's, and as such any Copyright notices in
	17	* the code are not to be removed.
	18	* If this package is used in a product, Eric Young should be given attribution
	19	* as the author of the parts of the library used.
	20	* This can be in the form of a textual message at program startup or
	21	* in documentation (online or textual) provided with the package.
	22	*
	23	* Redistribution and use in source and binary forms, with or without
	24	* modification, are permitted provided that the following conditions
	25	* are met:
	26	* 1. Redistributions of source code must retain the copyright
	27	* notice, this list of conditions and the following disclaimer.
	28	* 2. Redistributions in binary form must reproduce the above copyright
	29	* notice, this list of conditions and the following disclaimer in the
	30	* documentation and/or other materials provided with the distribution.
	31	* 3. All advertising materials mentioning features or use of this software
	32	* must display the following acknowledgement:
	33	* "This product includes cryptographic software written by
	34	* Eric Young (eay@cryptsoft.com)"
	35	* The word 'cryptographic' can be left out if the rouines from the library
	36	* being used are not cryptographic related :-).
	37	* 4. If you include any Windows specific code (or a derivative thereof) from
	38	* the apps directory (application code) you must include an acknowledgement:
	39	* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
	40	*
	41	* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
	42	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	43	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	44	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
	45	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	46	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	47	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	48	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	49	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	50	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	51	* SUCH DAMAGE.
	52	*
	53	* The licence and distribution terms for any publically available version or
	54	* derivative of this code cannot be changed. i.e. this code cannot simply be
	55	* copied and put under another distribution licence
	56	* [including the GNU Public Licence.]
	57	*/
	58
	59	#include <stdio.h>
	60	#include "cryptlib.h"
ec577822 BM	61	#include <openssl/x509.h>
	62	#include <openssl/objects.h>
	63	#include <openssl/evp.h>
d02b48c6 RE	64
	65	/* should be init to zeros. */
	66	static char prompt_string[80];
	67
6b691a5c	68	void EVP_set_pw_prompt(char *prompt)
d02b48c6 RE	69	{
	70	if (prompt == NULL)
	71	prompt_string[0]='\0';
	72	else
	73	strncpy(prompt_string,prompt,79);
	74	}
	75
6b691a5c	76	char *EVP_get_pw_prompt(void)
d02b48c6 RE	77	{
	78	if (prompt_string[0] == '\0')
	79	return(NULL);
	80	else
	81	return(prompt_string);
	82	}
	83
63da21c0 BM	84	/* For historical reasons, the standard function for reading passwords is
	85	* in the DES library -- if someone ever wants to disable DES,
	86	* this function will fail */
6b691a5c	87	int EVP_read_pw_string(char buf, int len, const char prompt, int verify)
d02b48c6	88	{
cf1b7d96	89	#ifndef OPENSSL_NO_DES
d02b48c6 RE	90	if ((prompt == NULL) && (prompt_string[0] != '\0'))
	91	prompt=prompt_string;
	92	return(des_read_pw_string(buf,len,prompt,verify));
63da21c0 BM	93	#else
	94	return -1;
	95	#endif
d02b48c6 RE	96	}
d02b48c6 RE	97
13588350	98	int EVP_BytesToKey(const EVP_CIPHER type, const EVP_MD md, unsigned char *salt,
6b691a5c UM	99	unsigned char data, int datal, int count, unsigned char key,
6b691a5c UM	100	unsigned char *iv)
d02b48c6 RE	101	{
	102	EVP_MD_CTX c;
	103	unsigned char md_buf[EVP_MAX_MD_SIZE];
	104	int niv,nkey,addmd=0;
	105	unsigned int mds=0,i;
	106
	107	nkey=type->key_len;
	108	niv=type->iv_len;
	109
	110	if (data == NULL) return(nkey);
	111
	112	for (;;)
	113	{
	114	EVP_DigestInit(&c,md);
	115	if (addmd++)
	116	EVP_DigestUpdate(&c,&(md_buf[0]),mds);
	117	EVP_DigestUpdate(&c,data,datal);
	118	if (salt != NULL)
f03aa651	119	EVP_DigestUpdate(&c,salt,PKCS5_SALT_LEN);
d02b48c6 RE	120	EVP_DigestFinal(&c,&(md_buf[0]),&mds);
	121
	122	for (i=1; i<(unsigned int)count; i++)
	123	{
	124	EVP_DigestInit(&c,md);
	125	EVP_DigestUpdate(&c,&(md_buf[0]),mds);
	126	EVP_DigestFinal(&c,&(md_buf[0]),&mds);
	127	}
	128	i=0;
	129	if (nkey)
	130	{
	131	for (;;)
	132	{
	133	if (nkey == 0) break;
	134	if (i == mds) break;
	135	if (key != NULL)
	136	*(key++)=md_buf[i];
	137	nkey--;
	138	i++;
	139	}
	140	}
	141	if (niv && (i != mds))
	142	{
	143	for (;;)
	144	{
	145	if (niv == 0) break;
	146	if (i == mds) break;
	147	if (iv != NULL)
	148	*(iv++)=md_buf[i];
	149	niv--;
	150	i++;
	151	}
	152	}
	153	if ((nkey == 0) && (niv == 0)) break;
	154	}
	155	memset(&c,0,sizeof(c));
	156	memset(&(md_buf[0]),0,EVP_MAX_MD_SIZE);
58964a49	157	return(type->key_len);
d02b48c6 RE	158	}
d02b48c6 RE	159