xref: /dragonfly/crypto/libressl/crypto/evp/evp_key.c (revision f5b1c8a1)
1 /* $OpenBSD: evp_key.c,v 1.22 2015/02/10 09:55:39 miod 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 /* should be init to zeros. */
69 static char prompt_string[80];
70 
71 void
72 EVP_set_pw_prompt(const char *prompt)
73 {
74 	if (prompt == NULL)
75 		prompt_string[0] = '\0';
76 	else {
77 		strlcpy(prompt_string, prompt, sizeof(prompt_string));
78 	}
79 }
80 
81 char *
82 EVP_get_pw_prompt(void)
83 {
84 	if (prompt_string[0] == '\0')
85 		return (NULL);
86 	else
87 		return (prompt_string);
88 }
89 
90 int
91 EVP_read_pw_string(char *buf, int len, const char *prompt, int verify)
92 {
93 	return EVP_read_pw_string_min(buf, 0, len, prompt, verify);
94 }
95 
96 int
97 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 	if ((prompt == NULL) && (prompt_string[0] != '\0'))
105 		prompt = prompt_string;
106 	ui = UI_new();
107 	if (ui == NULL)
108 		return -1;
109 	if (UI_add_input_string(ui, prompt, 0, buf, min,
110 	    (len >= BUFSIZ) ? BUFSIZ - 1 : len) < 0)
111 		return -1;
112 	if (verify) {
113 		if (UI_add_verify_string(ui, prompt, 0, buff, min,
114 		    (len >= BUFSIZ) ? BUFSIZ - 1 : len, buf) < 0)
115 			return -1;
116 	}
117 	ret = UI_process(ui);
118 	UI_free(ui);
119 	explicit_bzero(buff, BUFSIZ);
120 	return ret;
121 }
122 
123 int
124 EVP_BytesToKey(const EVP_CIPHER *type, const EVP_MD *md,
125     const unsigned char *salt, const unsigned char *data, int datal,
126     int count, unsigned char *key, unsigned char *iv)
127 {
128 	EVP_MD_CTX c;
129 	unsigned char md_buf[EVP_MAX_MD_SIZE];
130 	int niv, nkey, addmd = 0;
131 	unsigned int mds = 0, i;
132 	int rv = 0;
133 
134 	nkey = type->key_len;
135 	niv = type->iv_len;
136 
137 	if ((size_t)nkey > EVP_MAX_KEY_LENGTH) {
138 		EVPerr(EVP_F_EVP_BYTESTOKEY, EVP_R_BAD_KEY_LENGTH);
139 		return 0;
140 	}
141 	if ((size_t)niv > EVP_MAX_IV_LENGTH) {
142 		EVPerr(EVP_F_EVP_BYTESTOKEY, EVP_R_IV_TOO_LARGE);
143 		return 0;
144 	}
145 
146 	if (data == NULL)
147 		return (nkey);
148 
149 	EVP_MD_CTX_init(&c);
150 	for (;;) {
151 		if (!EVP_DigestInit_ex(&c, md, NULL))
152 			goto err;
153 		if (addmd++)
154 			if (!EVP_DigestUpdate(&c, &(md_buf[0]), mds))
155 				goto err;
156 		if (!EVP_DigestUpdate(&c, data, datal))
157 			goto err;
158 		if (salt != NULL)
159 			if (!EVP_DigestUpdate(&c, salt, PKCS5_SALT_LEN))
160 				goto err;
161 		if (!EVP_DigestFinal_ex(&c, &(md_buf[0]), &mds))
162 			goto err;
163 
164 		for (i = 1; i < (unsigned int)count; i++) {
165 			if (!EVP_DigestInit_ex(&c, md, NULL))
166 				goto err;
167 			if (!EVP_DigestUpdate(&c, &(md_buf[0]), mds))
168 				goto err;
169 			if (!EVP_DigestFinal_ex(&c, &(md_buf[0]), &mds))
170 				goto err;
171 		}
172 		i = 0;
173 		if (nkey) {
174 			for (;;) {
175 				if (nkey == 0)
176 					break;
177 				if (i == mds)
178 					break;
179 				if (key != NULL)
180 					*(key++) = md_buf[i];
181 				nkey--;
182 				i++;
183 			}
184 		}
185 		if (niv && (i != mds)) {
186 			for (;;) {
187 				if (niv == 0)
188 					break;
189 				if (i == mds)
190 					break;
191 				if (iv != NULL)
192 					*(iv++) = md_buf[i];
193 				niv--;
194 				i++;
195 			}
196 		}
197 		if ((nkey == 0) && (niv == 0))
198 			break;
199 	}
200 	rv = type->key_len;
201 
202 err:
203 	EVP_MD_CTX_cleanup(&c);
204 	explicit_bzero(md_buf, sizeof md_buf);
205 	return rv;
206 }
207