1 /* p12_key.c */
2 /*
3 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
4 * 1999.
5 */
6 /* ====================================================================
7 * Copyright (c) 1999 The OpenSSL Project. All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
19 * distribution.
20 *
21 * 3. All advertising materials mentioning features or use of this
22 * software must display the following acknowledgment:
23 * "This product includes software developed by the OpenSSL Project
24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 *
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 * endorse or promote products derived from this software without
28 * prior written permission. For written permission, please contact
29 * licensing@OpenSSL.org.
30 *
31 * 5. Products derived from this software may not be called "OpenSSL"
32 * nor may "OpenSSL" appear in their names without prior written
33 * permission of the OpenSSL Project.
34 *
35 * 6. Redistributions of any form whatsoever must retain the following
36 * acknowledgment:
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
53 *
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com). This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com).
57 *
58 */
59
60 #include <stdio.h>
61 #include "cryptlib.h"
62 #include <openssl/pkcs12.h>
63 #include <openssl/bn.h>
64
65 /* Uncomment out this line to get debugging info about key generation */
66 /*
67 * #define DEBUG_KEYGEN
68 */
69 #ifdef DEBUG_KEYGEN
70 # include <openssl/bio.h>
71 extern BIO *bio_err;
72 void h__dump(unsigned char *p, int len);
73 #endif
74
75 #ifdef OPENSSL_SYS_NETWARE
76 /* Rename these functions to avoid name clashes on NetWare OS */
77 # define uni2asc OPENSSL_uni2asc
78 # define asc2uni OPENSSL_asc2uni
79 #endif
80
81 /* PKCS12 compatible key/IV generation */
82 #ifndef min
83 # define min(a,b) ((a) < (b) ? (a) : (b))
84 #endif
85
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)86 int PKCS12_key_gen_asc(const char *pass, int passlen, unsigned char *salt,
87 int saltlen, int id, int iter, int n,
88 unsigned char *out, const EVP_MD *md_type)
89 {
90 int ret;
91 unsigned char *unipass;
92 int uniplen;
93 if (!pass) {
94 unipass = NULL;
95 uniplen = 0;
96 } else if (!asc2uni(pass, passlen, &unipass, &uniplen)) {
97 PKCS12err(PKCS12_F_PKCS12_KEY_GEN_ASC, ERR_R_MALLOC_FAILURE);
98 return 0;
99 }
100 ret = PKCS12_key_gen_uni(unipass, uniplen, salt, saltlen,
101 id, iter, n, out, md_type);
102 if (unipass) {
103 OPENSSL_cleanse(unipass, uniplen); /* Clear password from memory */
104 OPENSSL_free(unipass);
105 }
106 return ret;
107 }
108
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)109 int PKCS12_key_gen_uni(unsigned char *pass, int passlen, unsigned char *salt,
110 int saltlen, int id, int iter, int n,
111 unsigned char *out, const EVP_MD *md_type)
112 {
113 unsigned char *B, *D, *I, *p, *Ai;
114 int Slen, Plen, Ilen, Ijlen;
115 int i, j, u, v;
116 int ret = 0;
117 BIGNUM *Ij, *Bpl1; /* These hold Ij and B + 1 */
118 EVP_MD_CTX ctx;
119 #ifdef DEBUG_KEYGEN
120 unsigned char *tmpout = out;
121 int tmpn = n;
122 #endif
123
124 #if 0
125 if (!pass) {
126 PKCS12err(PKCS12_F_PKCS12_KEY_GEN_UNI, ERR_R_PASSED_NULL_PARAMETER);
127 return 0;
128 }
129 #endif
130
131 EVP_MD_CTX_init(&ctx);
132 #ifdef DEBUG_KEYGEN
133 fprintf(stderr, "KEYGEN DEBUG\n");
134 fprintf(stderr, "ID %d, ITER %d\n", id, iter);
135 fprintf(stderr, "Password (length %d):\n", passlen);
136 h__dump(pass, passlen);
137 fprintf(stderr, "Salt (length %d):\n", saltlen);
138 h__dump(salt, saltlen);
139 #endif
140 v = EVP_MD_block_size(md_type);
141 u = EVP_MD_size(md_type);
142 D = OPENSSL_malloc(v);
143 Ai = OPENSSL_malloc(u);
144 B = OPENSSL_malloc(v + 1);
145 Slen = v * ((saltlen + v - 1) / v);
146 if (passlen)
147 Plen = v * ((passlen + v - 1) / v);
148 else
149 Plen = 0;
150 Ilen = Slen + Plen;
151 I = OPENSSL_malloc(Ilen);
152 Ij = BN_new();
153 Bpl1 = BN_new();
154 if (!D || !Ai || !B || !I || !Ij || !Bpl1)
155 goto err;
156 for (i = 0; i < v; i++)
157 D[i] = id;
158 p = I;
159 for (i = 0; i < Slen; i++)
160 *p++ = salt[i % saltlen];
161 for (i = 0; i < Plen; i++)
162 *p++ = pass[i % passlen];
163 for (;;) {
164 EVP_DigestInit_ex(&ctx, md_type, NULL);
165 EVP_DigestUpdate(&ctx, D, v);
166 EVP_DigestUpdate(&ctx, I, Ilen);
167 EVP_DigestFinal_ex(&ctx, Ai, NULL);
168 for (j = 1; j < iter; j++) {
169 EVP_DigestInit_ex(&ctx, md_type, NULL);
170 EVP_DigestUpdate(&ctx, Ai, u);
171 EVP_DigestFinal_ex(&ctx, Ai, NULL);
172 }
173 memcpy(out, Ai, min(n, u));
174 if (u >= n) {
175 #ifdef DEBUG_KEYGEN
176 fprintf(stderr, "Output KEY (length %d)\n", tmpn);
177 h__dump(tmpout, tmpn);
178 #endif
179 ret = 1;
180 goto end;
181 }
182 n -= u;
183 out += u;
184 for (j = 0; j < v; j++)
185 B[j] = Ai[j % u];
186 /* Work out B + 1 first then can use B as tmp space */
187 if (!BN_bin2bn(B, v, Bpl1))
188 goto err;
189 if (!BN_add_word(Bpl1, 1))
190 goto err;
191 for (j = 0; j < Ilen; j += v) {
192 if (!BN_bin2bn(I + j, v, Ij))
193 goto err;
194 if (!BN_add(Ij, Ij, Bpl1))
195 goto err;
196 BN_bn2bin(Ij, B);
197 Ijlen = BN_num_bytes(Ij);
198 /* If more than 2^(v*8) - 1 cut off MSB */
199 if (Ijlen > v) {
200 BN_bn2bin(Ij, B);
201 memcpy(I + j, B + 1, v);
202 #ifndef PKCS12_BROKEN_KEYGEN
203 /* If less than v bytes pad with zeroes */
204 } else if (Ijlen < v) {
205 memset(I + j, 0, v - Ijlen);
206 BN_bn2bin(Ij, I + j + v - Ijlen);
207 #endif
208 } else
209 BN_bn2bin(Ij, I + j);
210 }
211 }
212
213 err:
214 PKCS12err(PKCS12_F_PKCS12_KEY_GEN_UNI, ERR_R_MALLOC_FAILURE);
215
216 end:
217 OPENSSL_free(Ai);
218 OPENSSL_free(B);
219 OPENSSL_free(D);
220 OPENSSL_free(I);
221 BN_free(Ij);
222 BN_free(Bpl1);
223 EVP_MD_CTX_cleanup(&ctx);
224 return ret;
225 }
226
227 #ifdef DEBUG_KEYGEN
h__dump(unsigned char * p,int len)228 void h__dump(unsigned char *p, int len)
229 {
230 for (; len--; p++)
231 fprintf(stderr, "%02X", *p);
232 fprintf(stderr, "\n");
233 }
234 #endif
235