1 /* $OpenBSD: p12_key.c,v 1.22 2015/02/07 13:19:15 doug 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 /* PKCS12 compatible key/IV generation */
67 #ifndef min
68 #define min(a,b) ((a) < (b) ? (a) : (b))
69 #endif
70 
71 int
72 PKCS12_key_gen_asc(const char *pass, int passlen, unsigned char *salt,
73     int saltlen, int id, int iter, int n, unsigned char *out,
74     const EVP_MD *md_type)
75 {
76 	int ret;
77 	unsigned char *unipass;
78 	int uniplen;
79 
80 	if (!pass) {
81 		unipass = NULL;
82 		uniplen = 0;
83 	} else if (!OPENSSL_asc2uni(pass, passlen, &unipass, &uniplen)) {
84 		PKCS12err(PKCS12_F_PKCS12_KEY_GEN_ASC, ERR_R_MALLOC_FAILURE);
85 		return 0;
86 	}
87 	ret = PKCS12_key_gen_uni(unipass, uniplen, salt, saltlen,
88 	    id, iter, n, out, md_type);
89 	if (ret <= 0)
90 		return 0;
91 	if (unipass) {
92 		explicit_bzero(unipass, uniplen);
93 		free(unipass);
94 	}
95 	return ret;
96 }
97 
98 int
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 	unsigned char *B, *D, *I, *p, *Ai;
104 	int Slen, Plen, Ilen, Ijlen;
105 	int i, j, u, v;
106 	int ret = 0;
107 	BIGNUM *Ij, *Bpl1;	/* These hold Ij and B + 1 */
108 	EVP_MD_CTX ctx;
109 
110 	EVP_MD_CTX_init(&ctx);
111 	v = EVP_MD_block_size(md_type);
112 	u = EVP_MD_size(md_type);
113 	if (u < 0)
114 		return 0;
115 	D = malloc(v);
116 	Ai = malloc(u);
117 	B = malloc(v + 1);
118 	Slen = v * ((saltlen + v - 1) / v);
119 	if (passlen)
120 		Plen = v * ((passlen + v - 1)/v);
121 	else
122 		Plen = 0;
123 	Ilen = Slen + Plen;
124 	I = malloc(Ilen);
125 	Ij = BN_new();
126 	Bpl1 = BN_new();
127 	if (!D || !Ai || !B || !I || !Ij || !Bpl1)
128 		goto err;
129 	for (i = 0; i < v; i++)
130 		D[i] = id;
131 	p = I;
132 	for (i = 0; i < Slen; i++)
133 		*p++ = salt[i % saltlen];
134 	for (i = 0; i < Plen; i++)
135 		*p++ = pass[i % passlen];
136 	for (;;) {
137 		if (!EVP_DigestInit_ex(&ctx, md_type, NULL) ||
138 		    !EVP_DigestUpdate(&ctx, D, v) ||
139 		    !EVP_DigestUpdate(&ctx, I, Ilen) ||
140 		    !EVP_DigestFinal_ex(&ctx, Ai, NULL))
141 			goto err;
142 		for (j = 1; j < iter; j++) {
143 			if (!EVP_DigestInit_ex(&ctx, md_type, NULL) ||
144 			    !EVP_DigestUpdate(&ctx, Ai, u) ||
145 			    !EVP_DigestFinal_ex(&ctx, Ai, NULL))
146 				goto err;
147 		}
148 		memcpy (out, Ai, min (n, u));
149 		if (u >= n) {
150 			ret = 1;
151 			goto end;
152 		}
153 		n -= u;
154 		out += u;
155 		for (j = 0; j < v; j++)
156 			B[j] = Ai[j % u];
157 		/* Work out B + 1 first then can use B as tmp space */
158 		if (!BN_bin2bn (B, v, Bpl1))
159 			goto err;
160 		if (!BN_add_word (Bpl1, 1))
161 			goto err;
162 		for (j = 0; j < Ilen; j += v) {
163 			if (!BN_bin2bn(I + j, v, Ij))
164 				goto err;
165 			if (!BN_add(Ij, Ij, Bpl1))
166 				goto err;
167 			if (!BN_bn2bin(Ij, B))
168 				goto err;
169 			Ijlen = BN_num_bytes (Ij);
170 			/* If more than 2^(v*8) - 1 cut off MSB */
171 			if (Ijlen > v) {
172 				if (!BN_bn2bin (Ij, B))
173 					goto err;
174 				memcpy (I + j, B + 1, v);
175 #ifndef PKCS12_BROKEN_KEYGEN
176 				/* If less than v bytes pad with zeroes */
177 			} else if (Ijlen < v) {
178 				memset(I + j, 0, v - Ijlen);
179 				if (!BN_bn2bin(Ij, I + j + v - Ijlen))
180 					goto err;
181 #endif
182 			} else if (!BN_bn2bin (Ij, I + j))
183 				goto err;
184 		}
185 	}
186 
187 err:
188 	PKCS12err(PKCS12_F_PKCS12_KEY_GEN_UNI, ERR_R_MALLOC_FAILURE);
189 
190 end:
191 	free(Ai);
192 	free(B);
193 	free(D);
194 	free(I);
195 	BN_free(Ij);
196 	BN_free(Bpl1);
197 	EVP_MD_CTX_cleanup(&ctx);
198 	return ret;
199 }
200