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 /*
60 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
61 * Use is subject to license terms.
62 */
63
64 #pragma ident "%Z%%M% %I% %E% SMI"
65
66 #include <stdio.h>
67 #include "cryptlib.h"
68 #include <openssl/x509.h>
69 #include <openssl/objects.h>
70 #include <openssl/evp.h>
71 #include <openssl/ui.h>
72
73 /* should be init to zeros. */
74 static char prompt_string[80];
75
EVP_set_pw_prompt(const char * prompt)76 void EVP_set_pw_prompt(const char *prompt)
77 {
78 if (prompt == NULL)
79 prompt_string[0]='\0';
80 else
81 {
82 strncpy(prompt_string,prompt,79);
83 prompt_string[79]='\0';
84 }
85 }
86
EVP_get_pw_prompt(void)87 char *EVP_get_pw_prompt(void)
88 {
89 if (prompt_string[0] == '\0')
90 return(NULL);
91 else
92 return(prompt_string);
93 }
94
95 #ifndef _BOOT
96 /* For historical reasons, the standard function for reading passwords is
97 * in the DES library -- if someone ever wants to disable DES,
98 * this function will fail */
EVP_read_pw_string(char * buf,int len,const char * prompt,int verify)99 int EVP_read_pw_string(char *buf, int len, const char *prompt, int verify)
100 {
101 int ret;
102 char buff[BUFSIZ];
103 UI *ui;
104
105 if ((prompt == NULL) && (prompt_string[0] != '\0'))
106 prompt=prompt_string;
107 ui = UI_new();
108 UI_add_input_string(ui,prompt,0,buf,0,(len>=BUFSIZ)?BUFSIZ-1:len);
109 if (verify)
110 UI_add_verify_string(ui,prompt,0,
111 buff,0,(len>=BUFSIZ)?BUFSIZ-1:len,buf);
112 ret = UI_process(ui);
113 UI_free(ui);
114 OPENSSL_cleanse(buff,BUFSIZ);
115 return ret;
116 }
117 #endif /* !_BOOT */
118
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)119 int EVP_BytesToKey(const EVP_CIPHER *type, const EVP_MD *md,
120 const unsigned char *salt, const unsigned char *data, int datal,
121 int count, unsigned char *key, unsigned char *iv)
122 {
123 EVP_MD_CTX c;
124 unsigned char md_buf[EVP_MAX_MD_SIZE];
125 int niv,nkey,addmd=0;
126 unsigned int mds=0,i;
127
128 nkey=type->key_len;
129 niv=type->iv_len;
130 OPENSSL_assert(nkey <= EVP_MAX_KEY_LENGTH);
131 OPENSSL_assert(niv <= EVP_MAX_IV_LENGTH);
132
133 if (data == NULL) return(nkey);
134
135 EVP_MD_CTX_init(&c);
136 for (;;)
137 {
138 EVP_DigestInit_ex(&c,md, NULL);
139 if (addmd++)
140 EVP_DigestUpdate(&c,&(md_buf[0]),mds);
141 EVP_DigestUpdate(&c,data,datal);
142 if (salt != NULL)
143 EVP_DigestUpdate(&c,salt,PKCS5_SALT_LEN);
144 EVP_DigestFinal_ex(&c,&(md_buf[0]),&mds);
145
146 for (i=1; i<(unsigned int)count; i++)
147 {
148 EVP_DigestInit_ex(&c,md, NULL);
149 EVP_DigestUpdate(&c,&(md_buf[0]),mds);
150 EVP_DigestFinal_ex(&c,&(md_buf[0]),&mds);
151 }
152 i=0;
153 if (nkey)
154 {
155 for (;;)
156 {
157 if (nkey == 0) break;
158 if (i == mds) break;
159 if (key != NULL)
160 *(key++)=md_buf[i];
161 nkey--;
162 i++;
163 }
164 }
165 if (niv && (i != mds))
166 {
167 for (;;)
168 {
169 if (niv == 0) break;
170 if (i == mds) break;
171 if (iv != NULL)
172 *(iv++)=md_buf[i];
173 niv--;
174 i++;
175 }
176 }
177 if ((nkey == 0) && (niv == 0)) break;
178 }
179 EVP_MD_CTX_cleanup(&c);
180 OPENSSL_cleanse(&(md_buf[0]),EVP_MAX_MD_SIZE);
181 return(type->key_len);
182 }
183
184