1 /* $OpenBSD: evp_key.c,v 1.27 2021/12/12 21:30:13 tb Exp $ */
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 <string.h>
61
62 #include <openssl/err.h>
63 #include <openssl/evp.h>
64 #include <openssl/objects.h>
65 #include <openssl/ui.h>
66 #include <openssl/x509.h>
67
68 #include "evp_locl.h"
69
70 /* should be init to zeros. */
71 static char prompt_string[80];
72
73 void
EVP_set_pw_prompt(const char * prompt)74 EVP_set_pw_prompt(const char *prompt)
75 {
76 if (prompt == NULL)
77 prompt_string[0] = '\0';
78 else {
79 strlcpy(prompt_string, prompt, sizeof(prompt_string));
80 }
81 }
82
83 char *
EVP_get_pw_prompt(void)84 EVP_get_pw_prompt(void)
85 {
86 if (prompt_string[0] == '\0')
87 return (NULL);
88 else
89 return (prompt_string);
90 }
91
92 int
EVP_read_pw_string(char * buf,int len,const char * prompt,int verify)93 EVP_read_pw_string(char *buf, int len, const char *prompt, int verify)
94 {
95 return EVP_read_pw_string_min(buf, 0, len, prompt, verify);
96 }
97
98 int
EVP_read_pw_string_min(char * buf,int min,int len,const char * prompt,int verify)99 EVP_read_pw_string_min(char *buf, int min, int len, const char *prompt,
100 int verify)
101 {
102 int ret;
103 char buff[BUFSIZ];
104 UI *ui;
105
106 if (len > BUFSIZ)
107 len = BUFSIZ;
108 /* Ensure that 0 <= min <= len - 1. In particular, 1 <= len. */
109 if (min < 0 || len - 1 < min)
110 return -1;
111 if ((prompt == NULL) && (prompt_string[0] != '\0'))
112 prompt = prompt_string;
113 ui = UI_new();
114 if (ui == NULL)
115 return -1;
116 if (UI_add_input_string(ui, prompt, 0, buf, min, len - 1) < 0)
117 return -1;
118 if (verify) {
119 if (UI_add_verify_string(ui, prompt, 0, buff, min, len - 1, buf)
120 < 0)
121 return -1;
122 }
123 ret = UI_process(ui);
124 UI_free(ui);
125 explicit_bzero(buff, BUFSIZ);
126 return ret;
127 }
128
129 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)130 EVP_BytesToKey(const EVP_CIPHER *type, const EVP_MD *md,
131 const unsigned char *salt, const unsigned char *data, int datal,
132 int count, unsigned char *key, unsigned char *iv)
133 {
134 EVP_MD_CTX c;
135 unsigned char md_buf[EVP_MAX_MD_SIZE];
136 int niv, nkey, addmd = 0;
137 unsigned int mds = 0, i;
138 int rv = 0;
139
140 nkey = type->key_len;
141 niv = type->iv_len;
142
143 if ((size_t)nkey > EVP_MAX_KEY_LENGTH) {
144 EVPerror(EVP_R_BAD_KEY_LENGTH);
145 return 0;
146 }
147 if ((size_t)niv > EVP_MAX_IV_LENGTH) {
148 EVPerror(EVP_R_IV_TOO_LARGE);
149 return 0;
150 }
151
152 if (data == NULL)
153 return (nkey);
154
155 EVP_MD_CTX_init(&c);
156 for (;;) {
157 if (!EVP_DigestInit_ex(&c, md, NULL))
158 goto err;
159 if (addmd++)
160 if (!EVP_DigestUpdate(&c, &(md_buf[0]), mds))
161 goto err;
162 if (!EVP_DigestUpdate(&c, data, datal))
163 goto err;
164 if (salt != NULL)
165 if (!EVP_DigestUpdate(&c, salt, PKCS5_SALT_LEN))
166 goto err;
167 if (!EVP_DigestFinal_ex(&c, &(md_buf[0]), &mds))
168 goto err;
169
170 for (i = 1; i < (unsigned int)count; i++) {
171 if (!EVP_DigestInit_ex(&c, md, NULL))
172 goto err;
173 if (!EVP_DigestUpdate(&c, &(md_buf[0]), mds))
174 goto err;
175 if (!EVP_DigestFinal_ex(&c, &(md_buf[0]), &mds))
176 goto err;
177 }
178 i = 0;
179 if (nkey) {
180 for (;;) {
181 if (nkey == 0)
182 break;
183 if (i == mds)
184 break;
185 if (key != NULL)
186 *(key++) = md_buf[i];
187 nkey--;
188 i++;
189 }
190 }
191 if (niv && (i != mds)) {
192 for (;;) {
193 if (niv == 0)
194 break;
195 if (i == mds)
196 break;
197 if (iv != NULL)
198 *(iv++) = md_buf[i];
199 niv--;
200 i++;
201 }
202 }
203 if ((nkey == 0) && (niv == 0))
204 break;
205 }
206 rv = type->key_len;
207
208 err:
209 EVP_MD_CTX_cleanup(&c);
210 explicit_bzero(md_buf, sizeof md_buf);
211 return rv;
212 }
213