1 /* $OpenBSD: evp_key.c,v 1.36 2024/04/09 13:52:41 beck 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_local.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 LCRYPTO_ALIAS(EVP_set_pw_prompt);
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
89 return prompt_string;
90 }
91 LCRYPTO_ALIAS(EVP_get_pw_prompt);
92
93 int
EVP_read_pw_string(char * buf,int len,const char * prompt,int verify)94 EVP_read_pw_string(char *buf, int len, const char *prompt, int verify)
95 {
96 return EVP_read_pw_string_min(buf, 0, len, prompt, verify);
97 }
98 LCRYPTO_ALIAS(EVP_read_pw_string);
99
100 int
EVP_read_pw_string_min(char * buf,int min,int len,const char * prompt,int verify)101 EVP_read_pw_string_min(char *buf, int min, int len, const char *prompt,
102 int verify)
103 {
104 UI *ui = NULL;
105 char buff[BUFSIZ];
106 int ret = -1;
107
108 if (len > BUFSIZ)
109 len = BUFSIZ;
110 /* Ensure that 0 <= min <= len - 1. In particular, 1 <= len. */
111 if (min < 0 || len - 1 < min)
112 goto err;
113
114 if (prompt == NULL && prompt_string[0] != '\0')
115 prompt = prompt_string;
116
117 if ((ui = UI_new()) == NULL)
118 goto err;
119 if (UI_add_input_string(ui, prompt, 0, buf, min, len - 1) < 0)
120 goto err;
121 if (verify) {
122 if (UI_add_verify_string(ui, prompt, 0, buff, min, len - 1,
123 buf) < 0)
124 goto err;
125 }
126
127 ret = UI_process(ui);
128
129 err:
130 UI_free(ui);
131 explicit_bzero(buff, BUFSIZ);
132
133 return ret;
134 }
135 LCRYPTO_ALIAS(EVP_read_pw_string_min);
136
137 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)138 EVP_BytesToKey(const EVP_CIPHER *type, const EVP_MD *md,
139 const unsigned char *salt, const unsigned char *data, int datal,
140 int count, unsigned char *key, unsigned char *iv)
141 {
142 EVP_MD_CTX *md_ctx;
143 unsigned char md_buf[EVP_MAX_MD_SIZE];
144 int niv, nkey, addmd = 0;
145 unsigned int mds = 0, i;
146 int rv = 0;
147
148 nkey = type->key_len;
149 niv = type->iv_len;
150
151 if ((size_t)nkey > EVP_MAX_KEY_LENGTH) {
152 EVPerror(EVP_R_BAD_KEY_LENGTH);
153 return 0;
154 }
155 if ((size_t)niv > EVP_MAX_IV_LENGTH) {
156 EVPerror(EVP_R_IV_TOO_LARGE);
157 return 0;
158 }
159
160 if (data == NULL)
161 return nkey;
162
163 if ((md_ctx = EVP_MD_CTX_new()) == NULL)
164 goto err;
165
166 for (;;) {
167 if (!EVP_DigestInit_ex(md_ctx, md, NULL))
168 goto err;
169 if (addmd++)
170 if (!EVP_DigestUpdate(md_ctx, &(md_buf[0]), mds))
171 goto err;
172 if (!EVP_DigestUpdate(md_ctx, data, datal))
173 goto err;
174 if (salt != NULL)
175 if (!EVP_DigestUpdate(md_ctx, salt, PKCS5_SALT_LEN))
176 goto err;
177 if (!EVP_DigestFinal_ex(md_ctx, &(md_buf[0]), &mds))
178 goto err;
179
180 for (i = 1; i < (unsigned int)count; i++) {
181 if (!EVP_DigestInit_ex(md_ctx, md, NULL))
182 goto err;
183 if (!EVP_DigestUpdate(md_ctx, &(md_buf[0]), mds))
184 goto err;
185 if (!EVP_DigestFinal_ex(md_ctx, &(md_buf[0]), &mds))
186 goto err;
187 }
188 i = 0;
189 if (nkey) {
190 for (;;) {
191 if (nkey == 0)
192 break;
193 if (i == mds)
194 break;
195 if (key != NULL)
196 *(key++) = md_buf[i];
197 nkey--;
198 i++;
199 }
200 }
201 if (niv && (i != mds)) {
202 for (;;) {
203 if (niv == 0)
204 break;
205 if (i == mds)
206 break;
207 if (iv != NULL)
208 *(iv++) = md_buf[i];
209 niv--;
210 i++;
211 }
212 }
213 if ((nkey == 0) && (niv == 0))
214 break;
215 }
216 rv = type->key_len;
217
218 err:
219 EVP_MD_CTX_free(md_ctx);
220 explicit_bzero(md_buf, sizeof md_buf);
221 return rv;
222 }
223 LCRYPTO_ALIAS(EVP_BytesToKey);
224