1 /* $OpenBSD: p12_key.c,v 1.31 2022/07/30 11:27:06 tb Exp $ */
2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3 * project 1999.
4 */
5 /* ====================================================================
6 * Copyright (c) 1999 The OpenSSL Project. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
18 * distribution.
19 *
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24 *
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * licensing@OpenSSL.org.
29 *
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
33 *
34 * 6. Redistributions of any form whatsoever must retain the following
35 * acknowledgment:
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 *
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
52 *
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com). This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
56 *
57 */
58
59 #include <stdio.h>
60 #include <string.h>
61
62 #include <openssl/bn.h>
63 #include <openssl/err.h>
64 #include <openssl/pkcs12.h>
65
66 #include "evp_locl.h"
67
68 /* PKCS12 compatible key/IV generation */
69 #ifndef min
70 #define min(a,b) ((a) < (b) ? (a) : (b))
71 #endif
72
73 int
PKCS12_key_gen_asc(const char * pass,int passlen,unsigned char * salt,int saltlen,int id,int iter,int n,unsigned char * out,const EVP_MD * md_type)74 PKCS12_key_gen_asc(const char *pass, int passlen, unsigned char *salt,
75 int saltlen, int id, int iter, int n, unsigned char *out,
76 const EVP_MD *md_type)
77 {
78 int ret;
79 unsigned char *unipass;
80 int uniplen;
81
82 if (!pass) {
83 unipass = NULL;
84 uniplen = 0;
85 } else if (!OPENSSL_asc2uni(pass, passlen, &unipass, &uniplen)) {
86 PKCS12error(ERR_R_MALLOC_FAILURE);
87 return 0;
88 }
89 ret = PKCS12_key_gen_uni(unipass, uniplen, salt, saltlen,
90 id, iter, n, out, md_type);
91 if (ret <= 0)
92 return 0;
93 freezero(unipass, uniplen);
94 return ret;
95 }
96
97 int
PKCS12_key_gen_uni(unsigned char * pass,int passlen,unsigned char * salt,int saltlen,int id,int iter,int n,unsigned char * out,const EVP_MD * md_type)98 PKCS12_key_gen_uni(unsigned char *pass, int passlen, unsigned char *salt,
99 int saltlen, int id, int iter, int n, unsigned char *out,
100 const EVP_MD *md_type)
101 {
102 EVP_MD_CTX *ctx = NULL;
103 unsigned char *B = NULL, *D = NULL, *I = NULL, *Ai = NULL;
104 unsigned char *p;
105 int Slen, Plen, Ilen;
106 int i, j, u, v;
107 int ret = 0;
108
109 if ((ctx = EVP_MD_CTX_new()) == NULL)
110 goto err;
111
112 if ((v = EVP_MD_block_size(md_type)) <= 0)
113 goto err;
114 if ((u = EVP_MD_size(md_type)) <= 0)
115 goto err;
116
117 if ((D = malloc(v)) == NULL)
118 goto err;
119 if ((Ai = malloc(u)) == NULL)
120 goto err;
121 if ((B = malloc(v + 1)) == NULL)
122 goto err;
123
124 Slen = v * ((saltlen + v - 1) / v);
125
126 Plen = 0;
127 if (passlen)
128 Plen = v * ((passlen + v - 1) / v);
129
130 Ilen = Slen + Plen;
131
132 if ((I = malloc(Ilen)) == NULL)
133 goto err;
134
135 for (i = 0; i < v; i++)
136 D[i] = id;
137
138 p = I;
139 for (i = 0; i < Slen; i++)
140 *p++ = salt[i % saltlen];
141 for (i = 0; i < Plen; i++)
142 *p++ = pass[i % passlen];
143
144 for (;;) {
145 if (!EVP_DigestInit_ex(ctx, md_type, NULL))
146 goto err;
147 if (!EVP_DigestUpdate(ctx, D, v))
148 goto err;
149 if (!EVP_DigestUpdate(ctx, I, Ilen))
150 goto err;
151 if (!EVP_DigestFinal_ex(ctx, Ai, NULL))
152 goto err;
153 for (j = 1; j < iter; j++) {
154 if (!EVP_DigestInit_ex(ctx, md_type, NULL))
155 goto err;
156 if (!EVP_DigestUpdate(ctx, Ai, u))
157 goto err;
158 if (!EVP_DigestFinal_ex(ctx, Ai, NULL))
159 goto err;
160 }
161 memcpy(out, Ai, min(n, u));
162 if (u >= n) {
163 ret = 1;
164 goto end;
165 }
166 n -= u;
167 out += u;
168 for (j = 0; j < v; j++)
169 B[j] = Ai[j % u];
170
171 for (j = 0; j < Ilen; j += v) {
172 uint16_t c = 1;
173 int k;
174
175 /* Work out I[j] = I[j] + B + 1. */
176 for (k = v - 1; k >= 0; k--) {
177 c += I[j + k] + B[k];
178 I[j + k] = (unsigned char)c;
179 c >>= 8;
180 }
181 }
182 }
183
184 err:
185 PKCS12error(ERR_R_MALLOC_FAILURE);
186
187 end:
188 free(Ai);
189 free(B);
190 free(D);
191 free(I);
192 EVP_MD_CTX_free(ctx);
193
194 return ret;
195 }
196