evp_key.c revision 55714 
1/* crypto/evp/evp_key.c */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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"
61#include <openssl/x509.h>
62#include <openssl/objects.h>
63#include <openssl/evp.h>
64
65/* should be init to zeros. */
66static char prompt_string[80];
67
68void EVP_set_pw_prompt(char *prompt)
69	{
70	if (prompt == NULL)
71		prompt_string[0]='\0';
72	else
73		strncpy(prompt_string,prompt,79);
74	}
75
76char *EVP_get_pw_prompt(void)
77	{
78	if (prompt_string[0] == '\0')
79		return(NULL);
80	else
81		return(prompt_string);
82	}
83
84#ifdef NO_DES
85int des_read_pw_string(char *buf,int len,const char *prompt,int verify);
86#endif
87
88int EVP_read_pw_string(char *buf, int len, const char *prompt, int verify)
89	{
90	if ((prompt == NULL) && (prompt_string[0] != '\0'))
91		prompt=prompt_string;
92	return(des_read_pw_string(buf,len,prompt,verify));
93	}
94
95int EVP_BytesToKey(const EVP_CIPHER *type, EVP_MD *md, unsigned char *salt,
96	     unsigned char *data, int datal, int count, unsigned char *key,
97	     unsigned char *iv)
98	{
99	EVP_MD_CTX c;
100	unsigned char md_buf[EVP_MAX_MD_SIZE];
101	int niv,nkey,addmd=0;
102	unsigned int mds=0,i;
103
104	nkey=type->key_len;
105	niv=type->iv_len;
106
107	if (data == NULL) return(nkey);
108
109	for (;;)
110		{
111		EVP_DigestInit(&c,md);
112		if (addmd++)
113			EVP_DigestUpdate(&c,&(md_buf[0]),mds);
114		EVP_DigestUpdate(&c,data,datal);
115		if (salt != NULL)
116			EVP_DigestUpdate(&c,salt,8);
117		EVP_DigestFinal(&c,&(md_buf[0]),&mds);
118
119		for (i=1; i<(unsigned int)count; i++)
120			{
121			EVP_DigestInit(&c,md);
122			EVP_DigestUpdate(&c,&(md_buf[0]),mds);
123			EVP_DigestFinal(&c,&(md_buf[0]),&mds);
124			}
125		i=0;
126		if (nkey)
127			{
128			for (;;)
129				{
130				if (nkey == 0) break;
131				if (i == mds) break;
132				if (key != NULL)
133					*(key++)=md_buf[i];
134				nkey--;
135				i++;
136				}
137			}
138		if (niv && (i != mds))
139			{
140			for (;;)
141				{
142				if (niv == 0) break;
143				if (i == mds) break;
144				if (iv != NULL)
145					*(iv++)=md_buf[i];
146				niv--;
147				i++;
148				}
149			}
150		if ((nkey == 0) && (niv == 0)) break;
151		}
152	memset(&c,0,sizeof(c));
153	memset(&(md_buf[0]),0,EVP_MAX_MD_SIZE);
154	return(type->key_len);
155	}
156
157