Line data Source code
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 : #include <openssl/ui.h>
65 :
66 : /* should be init to zeros. */
67 : static char prompt_string[80];
68 :
69 0 : void EVP_set_pw_prompt(const char *prompt)
70 : {
71 0 : if (prompt == NULL)
72 0 : prompt_string[0] = '\0';
73 : else {
74 : strncpy(prompt_string, prompt, 79);
75 0 : prompt_string[79] = '\0';
76 : }
77 0 : }
78 :
79 0 : char *EVP_get_pw_prompt(void)
80 : {
81 0 : if (prompt_string[0] == '\0')
82 : return (NULL);
83 : else
84 0 : return (prompt_string);
85 : }
86 :
87 : /*
88 : * For historical reasons, the standard function for reading passwords is in
89 : * the DES library -- if someone ever wants to disable DES, this function
90 : * will fail
91 : */
92 0 : int EVP_read_pw_string(char *buf, int len, const char *prompt, int verify)
93 : {
94 0 : return EVP_read_pw_string_min(buf, 0, len, prompt, verify);
95 : }
96 :
97 0 : int EVP_read_pw_string_min(char *buf, int min, int len, const char *prompt,
98 : int verify)
99 : {
100 : int ret;
101 : char buff[BUFSIZ];
102 : UI *ui;
103 :
104 0 : if ((prompt == NULL) && (prompt_string[0] != '\0'))
105 : prompt = prompt_string;
106 0 : ui = UI_new();
107 0 : UI_add_input_string(ui, prompt, 0, buf, min,
108 : (len >= BUFSIZ) ? BUFSIZ - 1 : len);
109 0 : if (verify)
110 0 : UI_add_verify_string(ui, prompt, 0,
111 : buff, min, (len >= BUFSIZ) ? BUFSIZ - 1 : len,
112 : buf);
113 0 : ret = UI_process(ui);
114 0 : UI_free(ui);
115 0 : OPENSSL_cleanse(buff, BUFSIZ);
116 0 : return ret;
117 : }
118 :
119 0 : int EVP_BytesToKey(const EVP_CIPHER *type, const EVP_MD *md,
120 : const unsigned char *salt, const unsigned char *data,
121 : int datal, int count, unsigned char *key,
122 : unsigned char *iv)
123 : {
124 : EVP_MD_CTX c;
125 : unsigned char md_buf[EVP_MAX_MD_SIZE];
126 : int niv, nkey, addmd = 0;
127 0 : unsigned int mds = 0, i;
128 : int rv = 0;
129 0 : nkey = type->key_len;
130 0 : niv = type->iv_len;
131 0 : OPENSSL_assert(nkey <= EVP_MAX_KEY_LENGTH);
132 0 : OPENSSL_assert(niv <= EVP_MAX_IV_LENGTH);
133 :
134 0 : if (data == NULL)
135 : return (nkey);
136 :
137 0 : EVP_MD_CTX_init(&c);
138 : for (;;) {
139 0 : if (!EVP_DigestInit_ex(&c, md, NULL))
140 : return 0;
141 0 : if (addmd++)
142 0 : if (!EVP_DigestUpdate(&c, &(md_buf[0]), mds))
143 : goto err;
144 0 : if (!EVP_DigestUpdate(&c, data, datal))
145 : goto err;
146 0 : if (salt != NULL)
147 0 : if (!EVP_DigestUpdate(&c, salt, PKCS5_SALT_LEN))
148 : goto err;
149 0 : if (!EVP_DigestFinal_ex(&c, &(md_buf[0]), &mds))
150 : goto err;
151 :
152 0 : for (i = 1; i < (unsigned int)count; i++) {
153 0 : if (!EVP_DigestInit_ex(&c, md, NULL))
154 : goto err;
155 0 : if (!EVP_DigestUpdate(&c, &(md_buf[0]), mds))
156 : goto err;
157 0 : if (!EVP_DigestFinal_ex(&c, &(md_buf[0]), &mds))
158 : goto err;
159 : }
160 : i = 0;
161 0 : if (nkey) {
162 : for (;;) {
163 0 : if (nkey == 0)
164 : break;
165 0 : if (i == mds)
166 : break;
167 0 : if (key != NULL)
168 0 : *(key++) = md_buf[i];
169 0 : nkey--;
170 0 : i++;
171 0 : }
172 : }
173 0 : if (niv && (i != mds)) {
174 : for (;;) {
175 0 : if (niv == 0)
176 : break;
177 0 : if (i == mds)
178 : break;
179 0 : if (iv != NULL)
180 0 : *(iv++) = md_buf[i];
181 0 : niv--;
182 0 : i++;
183 0 : }
184 : }
185 0 : if ((nkey == 0) && (niv == 0))
186 : break;
187 : }
188 0 : rv = type->key_len;
189 : err:
190 0 : EVP_MD_CTX_cleanup(&c);
191 0 : OPENSSL_cleanse(&(md_buf[0]), EVP_MAX_MD_SIZE);
192 0 : return rv;
193 : }
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