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. */
71static char prompt_string[80];
72
73void
74EVP_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}
81LCRYPTO_ALIAS(EVP_set_pw_prompt);
82
83char *
84EVP_get_pw_prompt(void)
85{
86	if (prompt_string[0] == '\0')
87		return NULL;
88
89	return prompt_string;
90}
91LCRYPTO_ALIAS(EVP_get_pw_prompt);
92
93int
94EVP_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}
98LCRYPTO_ALIAS(EVP_read_pw_string);
99
100int
101EVP_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}
135LCRYPTO_ALIAS(EVP_read_pw_string_min);
136
137int
138EVP_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
218err:
219	EVP_MD_CTX_free(md_ctx);
220	explicit_bzero(md_buf, sizeof md_buf);
221	return rv;
222}
223LCRYPTO_ALIAS(EVP_BytesToKey);
224