1 /* p12_key.c */
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 "cryptlib.h"
61 #include <openssl/pkcs12.h>
62 #include <openssl/bn.h>
63
64 /* Uncomment out this line to get debugging info about key generation */
65 /*#define DEBUG_KEYGEN*/
66 #ifdef DEBUG_KEYGEN
67 #include <openssl/bio.h>
68 extern BIO *bio_err;
69 void h__dump (unsigned char *p, int len);
70 #endif
71
72 /* PKCS12 compatible key/IV generation */
73 #ifndef min
74 #define min(a,b) ((a) < (b) ? (a) : (b))
75 #endif
76
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)77 int PKCS12_key_gen_asc(const char *pass, int passlen, unsigned char *salt,
78 int saltlen, int id, int iter, int n, unsigned char *out,
79 const EVP_MD *md_type)
80 {
81 int ret;
82 unsigned char *unipass;
83 int uniplen;
84
85 if(!pass) {
86 unipass = NULL;
87 uniplen = 0;
88 } else if (!OPENSSL_asc2uni(pass, passlen, &unipass, &uniplen)) {
89 PKCS12err(PKCS12_F_PKCS12_KEY_GEN_ASC,ERR_R_MALLOC_FAILURE);
90 return 0;
91 }
92 ret = PKCS12_key_gen_uni(unipass, uniplen, salt, saltlen,
93 id, iter, n, out, md_type);
94 if (ret <= 0)
95 return 0;
96 if(unipass) {
97 OPENSSL_cleanse(unipass, uniplen); /* Clear password from memory */
98 OPENSSL_free(unipass);
99 }
100 return ret;
101 }
102
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)103 int PKCS12_key_gen_uni(unsigned char *pass, int passlen, unsigned char *salt,
104 int saltlen, int id, int iter, int n, unsigned char *out,
105 const EVP_MD *md_type)
106 {
107 unsigned char *B, *D, *I, *p, *Ai;
108 int Slen, Plen, Ilen, Ijlen;
109 int i, j, u, v;
110 BIGNUM *Ij, *Bpl1; /* These hold Ij and B + 1 */
111 EVP_MD_CTX ctx;
112 #ifdef DEBUG_KEYGEN
113 unsigned char *tmpout = out;
114 int tmpn = n;
115 #endif
116
117 #if 0
118 if (!pass) {
119 PKCS12err(PKCS12_F_PKCS12_KEY_GEN_UNI,ERR_R_PASSED_NULL_PARAMETER);
120 return 0;
121 }
122 #endif
123
124 EVP_MD_CTX_init(&ctx);
125 #ifdef DEBUG_KEYGEN
126 fprintf(stderr, "KEYGEN DEBUG\n");
127 fprintf(stderr, "ID %d, ITER %d\n", id, iter);
128 fprintf(stderr, "Password (length %d):\n", passlen);
129 h__dump(pass, passlen);
130 fprintf(stderr, "Salt (length %d):\n", saltlen);
131 h__dump(salt, saltlen);
132 #endif
133 v = EVP_MD_block_size (md_type);
134 u = EVP_MD_size (md_type);
135 if (u < 0)
136 return 0;
137 D = OPENSSL_malloc (v);
138 Ai = OPENSSL_malloc (u);
139 B = OPENSSL_malloc (v + 1);
140 Slen = v * ((saltlen+v-1)/v);
141 if(passlen) Plen = v * ((passlen+v-1)/v);
142 else Plen = 0;
143 Ilen = Slen + Plen;
144 I = OPENSSL_malloc (Ilen);
145 Ij = BN_new();
146 Bpl1 = BN_new();
147 if (!D || !Ai || !B || !I || !Ij || !Bpl1) {
148 PKCS12err(PKCS12_F_PKCS12_KEY_GEN_UNI,ERR_R_MALLOC_FAILURE);
149 return 0;
150 }
151 for (i = 0; i < v; i++) D[i] = id;
152 p = I;
153 for (i = 0; i < Slen; i++) *p++ = salt[i % saltlen];
154 for (i = 0; i < Plen; i++) *p++ = pass[i % passlen];
155 for (;;) {
156 EVP_DigestInit_ex(&ctx, md_type, NULL);
157 EVP_DigestUpdate(&ctx, D, v);
158 EVP_DigestUpdate(&ctx, I, Ilen);
159 EVP_DigestFinal_ex(&ctx, Ai, NULL);
160 for (j = 1; j < iter; j++) {
161 EVP_DigestInit_ex(&ctx, md_type, NULL);
162 EVP_DigestUpdate(&ctx, Ai, u);
163 EVP_DigestFinal_ex(&ctx, Ai, NULL);
164 }
165 memcpy (out, Ai, min (n, u));
166 if (u >= n) {
167 OPENSSL_free (Ai);
168 OPENSSL_free (B);
169 OPENSSL_free (D);
170 OPENSSL_free (I);
171 BN_free (Ij);
172 BN_free (Bpl1);
173 EVP_MD_CTX_cleanup(&ctx);
174 #ifdef DEBUG_KEYGEN
175 fprintf(stderr, "Output KEY (length %d)\n", tmpn);
176 h__dump(tmpout, tmpn);
177 #endif
178 return 1;
179 }
180 n -= u;
181 out += u;
182 for (j = 0; j < v; j++) B[j] = Ai[j % u];
183 /* Work out B + 1 first then can use B as tmp space */
184 BN_bin2bn (B, v, Bpl1);
185 BN_add_word (Bpl1, 1);
186 for (j = 0; j < Ilen ; j+=v) {
187 BN_bin2bn (I + j, v, Ij);
188 BN_add (Ij, Ij, Bpl1);
189 BN_bn2bin (Ij, B);
190 Ijlen = BN_num_bytes (Ij);
191 /* If more than 2^(v*8) - 1 cut off MSB */
192 if (Ijlen > v) {
193 BN_bn2bin (Ij, B);
194 memcpy (I + j, B + 1, v);
195 #ifndef PKCS12_BROKEN_KEYGEN
196 /* If less than v bytes pad with zeroes */
197 } else if (Ijlen < v) {
198 memset(I + j, 0, v - Ijlen);
199 BN_bn2bin(Ij, I + j + v - Ijlen);
200 #endif
201 } else BN_bn2bin (Ij, I + j);
202 }
203 }
204 }
205 #ifdef DEBUG_KEYGEN
h__dump(unsigned char * p,int len)206 void h__dump (unsigned char *p, int len)
207 {
208 for (; len --; p++) fprintf(stderr, "%02X", *p);
209 fprintf(stderr, "\n");
210 }
211 #endif
212