Line data Source code
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 : /* PKCS12 compatible key/IV generation */
76 : #ifndef min
77 : # define min(a,b) ((a) < (b) ? (a) : (b))
78 : #endif
79 :
80 0 : int PKCS12_key_gen_asc(const char *pass, int passlen, unsigned char *salt,
81 : int saltlen, int id, int iter, int n,
82 : unsigned char *out, const EVP_MD *md_type)
83 : {
84 : int ret;
85 : unsigned char *unipass;
86 : int uniplen;
87 :
88 0 : if (!pass) {
89 0 : unipass = NULL;
90 0 : uniplen = 0;
91 0 : } else if (!OPENSSL_asc2uni(pass, passlen, &unipass, &uniplen)) {
92 0 : PKCS12err(PKCS12_F_PKCS12_KEY_GEN_ASC, ERR_R_MALLOC_FAILURE);
93 0 : return 0;
94 : }
95 0 : ret = PKCS12_key_gen_uni(unipass, uniplen, salt, saltlen,
96 : id, iter, n, out, md_type);
97 0 : if (ret <= 0)
98 : return 0;
99 0 : if (unipass) {
100 0 : OPENSSL_cleanse(unipass, uniplen); /* Clear password from memory */
101 0 : OPENSSL_free(unipass);
102 : }
103 0 : return ret;
104 : }
105 :
106 0 : int PKCS12_key_gen_uni(unsigned char *pass, int passlen, unsigned char *salt,
107 : int saltlen, int id, int iter, int n,
108 : unsigned char *out, const EVP_MD *md_type)
109 : {
110 : unsigned char *B, *D, *I, *p, *Ai;
111 : int Slen, Plen, Ilen, Ijlen;
112 : int i, j, u, v;
113 : int ret = 0;
114 : BIGNUM *Ij, *Bpl1; /* These hold Ij and B + 1 */
115 : EVP_MD_CTX ctx;
116 : #ifdef DEBUG_KEYGEN
117 : unsigned char *tmpout = out;
118 : int tmpn = n;
119 : #endif
120 :
121 : #if 0
122 : if (!pass) {
123 : PKCS12err(PKCS12_F_PKCS12_KEY_GEN_UNI, ERR_R_PASSED_NULL_PARAMETER);
124 : return 0;
125 : }
126 : #endif
127 :
128 0 : EVP_MD_CTX_init(&ctx);
129 : #ifdef DEBUG_KEYGEN
130 : fprintf(stderr, "KEYGEN DEBUG\n");
131 : fprintf(stderr, "ID %d, ITER %d\n", id, iter);
132 : fprintf(stderr, "Password (length %d):\n", passlen);
133 : h__dump(pass, passlen);
134 : fprintf(stderr, "Salt (length %d):\n", saltlen);
135 : h__dump(salt, saltlen);
136 : #endif
137 0 : v = EVP_MD_block_size(md_type);
138 0 : u = EVP_MD_size(md_type);
139 0 : if (u < 0)
140 : return 0;
141 0 : D = OPENSSL_malloc(v);
142 0 : Ai = OPENSSL_malloc(u);
143 0 : B = OPENSSL_malloc(v + 1);
144 0 : Slen = v * ((saltlen + v - 1) / v);
145 0 : if (passlen)
146 0 : Plen = v * ((passlen + v - 1) / v);
147 : else
148 : Plen = 0;
149 0 : Ilen = Slen + Plen;
150 0 : I = OPENSSL_malloc(Ilen);
151 0 : Ij = BN_new();
152 0 : Bpl1 = BN_new();
153 0 : if (!D || !Ai || !B || !I || !Ij || !Bpl1)
154 : goto err;
155 0 : for (i = 0; i < v; i++)
156 0 : D[i] = id;
157 : p = I;
158 0 : for (i = 0; i < Slen; i++)
159 0 : *p++ = salt[i % saltlen];
160 0 : for (i = 0; i < Plen; i++)
161 0 : *p++ = pass[i % passlen];
162 : for (;;) {
163 0 : if (!EVP_DigestInit_ex(&ctx, md_type, NULL)
164 0 : || !EVP_DigestUpdate(&ctx, D, v)
165 0 : || !EVP_DigestUpdate(&ctx, I, Ilen)
166 0 : || !EVP_DigestFinal_ex(&ctx, Ai, NULL))
167 : goto err;
168 0 : for (j = 1; j < iter; j++) {
169 0 : if (!EVP_DigestInit_ex(&ctx, md_type, NULL)
170 0 : || !EVP_DigestUpdate(&ctx, Ai, u)
171 0 : || !EVP_DigestFinal_ex(&ctx, Ai, NULL))
172 : goto err;
173 : }
174 0 : memcpy(out, Ai, min(n, u));
175 0 : if (u >= n) {
176 : #ifdef DEBUG_KEYGEN
177 : fprintf(stderr, "Output KEY (length %d)\n", tmpn);
178 : h__dump(tmpout, tmpn);
179 : #endif
180 : ret = 1;
181 : goto end;
182 : }
183 0 : n -= u;
184 0 : out += u;
185 0 : for (j = 0; j < v; j++)
186 0 : B[j] = Ai[j % u];
187 : /* Work out B + 1 first then can use B as tmp space */
188 0 : if (!BN_bin2bn(B, v, Bpl1))
189 : goto err;
190 0 : if (!BN_add_word(Bpl1, 1))
191 : goto err;
192 0 : for (j = 0; j < Ilen; j += v) {
193 0 : if (!BN_bin2bn(I + j, v, Ij))
194 : goto err;
195 0 : if (!BN_add(Ij, Ij, Bpl1))
196 : goto err;
197 0 : if (!BN_bn2bin(Ij, B))
198 : goto err;
199 0 : Ijlen = BN_num_bytes(Ij);
200 : /* If more than 2^(v*8) - 1 cut off MSB */
201 0 : if (Ijlen > v) {
202 0 : if (!BN_bn2bin(Ij, B))
203 : goto err;
204 0 : memcpy(I + j, B + 1, v);
205 : #ifndef PKCS12_BROKEN_KEYGEN
206 : /* If less than v bytes pad with zeroes */
207 0 : } else if (Ijlen < v) {
208 0 : memset(I + j, 0, v - Ijlen);
209 0 : if (!BN_bn2bin(Ij, I + j + v - Ijlen))
210 : goto err;
211 : #endif
212 0 : } else if (!BN_bn2bin(Ij, I + j))
213 : goto err;
214 : }
215 : }
216 :
217 : err:
218 0 : PKCS12err(PKCS12_F_PKCS12_KEY_GEN_UNI, ERR_R_MALLOC_FAILURE);
219 :
220 : end:
221 0 : OPENSSL_free(Ai);
222 0 : OPENSSL_free(B);
223 0 : OPENSSL_free(D);
224 0 : OPENSSL_free(I);
225 0 : BN_free(Ij);
226 0 : BN_free(Bpl1);
227 0 : EVP_MD_CTX_cleanup(&ctx);
228 0 : return ret;
229 : }
230 :
231 : #ifdef DEBUG_KEYGEN
232 : void h__dump(unsigned char *p, int len)
233 : {
234 : for (; len--; p++)
235 : fprintf(stderr, "%02X", *p);
236 : fprintf(stderr, "\n");
237 : }
238 : #endif
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