1 /* $OpenBSD: p12_key.c,v 1.35 2024/03/02 10:15:16 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_local.h"
67 #include "pkcs12_local.h"
68
69 /* PKCS12 compatible key/IV generation */
70 #ifndef min
71 #define min(a,b) ((a) < (b) ? (a) : (b))
72 #endif
73
74 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)75 PKCS12_key_gen_asc(const char *pass, int passlen, unsigned char *salt,
76 int saltlen, int id, int iter, int n, unsigned char *out,
77 const EVP_MD *md_type)
78 {
79 int ret;
80 unsigned char *unipass;
81 int uniplen;
82
83 if (!pass) {
84 unipass = NULL;
85 uniplen = 0;
86 } else if (!OPENSSL_asc2uni(pass, passlen, &unipass, &uniplen)) {
87 PKCS12error(ERR_R_MALLOC_FAILURE);
88 return 0;
89 }
90 ret = PKCS12_key_gen_uni(unipass, uniplen, salt, saltlen,
91 id, iter, n, out, md_type);
92 if (ret <= 0)
93 return 0;
94 freezero(unipass, uniplen);
95 return ret;
96 }
97
98 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)99 PKCS12_key_gen_uni(unsigned char *pass, int passlen, unsigned char *salt,
100 int saltlen, int id, int iter, int n, unsigned char *out,
101 const EVP_MD *md_type)
102 {
103 EVP_MD_CTX *ctx = NULL;
104 unsigned char *B = NULL, *D = NULL, *I = NULL, *Ai = NULL;
105 unsigned char *p;
106 int Slen, Plen, Ilen;
107 int i, j, u, v;
108 int ret = 0;
109
110 if ((ctx = EVP_MD_CTX_new()) == NULL)
111 goto err;
112
113 if ((v = EVP_MD_block_size(md_type)) <= 0)
114 goto err;
115 if ((u = EVP_MD_size(md_type)) <= 0)
116 goto err;
117
118 if ((D = malloc(v)) == NULL)
119 goto err;
120 if ((Ai = malloc(u)) == NULL)
121 goto err;
122 if ((B = malloc(v + 1)) == NULL)
123 goto err;
124
125 Slen = v * ((saltlen + v - 1) / v);
126
127 Plen = 0;
128 if (passlen)
129 Plen = v * ((passlen + v - 1) / v);
130
131 Ilen = Slen + Plen;
132
133 if ((I = malloc(Ilen)) == NULL)
134 goto err;
135
136 for (i = 0; i < v; i++)
137 D[i] = id;
138
139 p = I;
140 for (i = 0; i < Slen; i++)
141 *p++ = salt[i % saltlen];
142 for (i = 0; i < Plen; i++)
143 *p++ = pass[i % passlen];
144
145 for (;;) {
146 if (!EVP_DigestInit_ex(ctx, md_type, NULL))
147 goto err;
148 if (!EVP_DigestUpdate(ctx, D, v))
149 goto err;
150 if (!EVP_DigestUpdate(ctx, I, Ilen))
151 goto err;
152 if (!EVP_DigestFinal_ex(ctx, Ai, NULL))
153 goto err;
154 for (j = 1; j < iter; j++) {
155 if (!EVP_DigestInit_ex(ctx, md_type, NULL))
156 goto err;
157 if (!EVP_DigestUpdate(ctx, Ai, u))
158 goto err;
159 if (!EVP_DigestFinal_ex(ctx, Ai, NULL))
160 goto err;
161 }
162 memcpy(out, Ai, min(n, u));
163 if (u >= n) {
164 ret = 1;
165 goto end;
166 }
167 n -= u;
168 out += u;
169 for (j = 0; j < v; j++)
170 B[j] = Ai[j % u];
171
172 for (j = 0; j < Ilen; j += v) {
173 uint16_t c = 1;
174 int k;
175
176 /* Work out I[j] = I[j] + B + 1. */
177 for (k = v - 1; k >= 0; k--) {
178 c += I[j + k] + B[k];
179 I[j + k] = (unsigned char)c;
180 c >>= 8;
181 }
182 }
183 }
184
185 err:
186 PKCS12error(ERR_R_MALLOC_FAILURE);
187
188 end:
189 free(Ai);
190 free(B);
191 free(D);
192 free(I);
193 EVP_MD_CTX_free(ctx);
194
195 return ret;
196 }
197