xref: /freebsd/crypto/openssl/crypto/pkcs12/p12_key.c (revision 641a6cfb86023499caafe26a4d821a0b885cf00b)
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 
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 
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 	int ret = 0;
111 	BIGNUM *Ij, *Bpl1;	/* These hold Ij and B + 1 */
112 	EVP_MD_CTX ctx;
113 #ifdef  DEBUG_KEYGEN
114 	unsigned char *tmpout = out;
115 	int tmpn = n;
116 #endif
117 
118 #if 0
119 	if (!pass) {
120 		PKCS12err(PKCS12_F_PKCS12_KEY_GEN_UNI,ERR_R_PASSED_NULL_PARAMETER);
121 		return 0;
122 	}
123 #endif
124 
125 	EVP_MD_CTX_init(&ctx);
126 #ifdef  DEBUG_KEYGEN
127 	fprintf(stderr, "KEYGEN DEBUG\n");
128 	fprintf(stderr, "ID %d, ITER %d\n", id, iter);
129 	fprintf(stderr, "Password (length %d):\n", passlen);
130 	h__dump(pass, passlen);
131 	fprintf(stderr, "Salt (length %d):\n", saltlen);
132 	h__dump(salt, saltlen);
133 #endif
134 	v = EVP_MD_block_size (md_type);
135 	u = EVP_MD_size (md_type);
136 	if (u < 0)
137 	    return 0;
138 	D = OPENSSL_malloc (v);
139 	Ai = OPENSSL_malloc (u);
140 	B = OPENSSL_malloc (v + 1);
141 	Slen = v * ((saltlen+v-1)/v);
142 	if(passlen) Plen = v * ((passlen+v-1)/v);
143 	else Plen = 0;
144 	Ilen = Slen + Plen;
145 	I = OPENSSL_malloc (Ilen);
146 	Ij = BN_new();
147 	Bpl1 = BN_new();
148 	if (!D || !Ai || !B || !I || !Ij || !Bpl1)
149 		goto err;
150 	for (i = 0; i < v; i++) D[i] = id;
151 	p = I;
152 	for (i = 0; i < Slen; i++) *p++ = salt[i % saltlen];
153 	for (i = 0; i < Plen; i++) *p++ = pass[i % passlen];
154 	for (;;) {
155 		if (!EVP_DigestInit_ex(&ctx, md_type, NULL)
156 			|| !EVP_DigestUpdate(&ctx, D, v)
157 			|| !EVP_DigestUpdate(&ctx, I, Ilen)
158 			|| !EVP_DigestFinal_ex(&ctx, Ai, NULL))
159 			goto err;
160 		for (j = 1; j < iter; j++) {
161 			if (!EVP_DigestInit_ex(&ctx, md_type, NULL)
162 				|| !EVP_DigestUpdate(&ctx, Ai, u)
163 				|| !EVP_DigestFinal_ex(&ctx, Ai, NULL))
164 			goto err;
165 		}
166 		memcpy (out, Ai, min (n, u));
167 		if (u >= n) {
168 #ifdef DEBUG_KEYGEN
169 			fprintf(stderr, "Output KEY (length %d)\n", tmpn);
170 			h__dump(tmpout, tmpn);
171 #endif
172 			ret = 1;
173 			goto end;
174 		}
175 		n -= u;
176 		out += u;
177 		for (j = 0; j < v; j++) B[j] = Ai[j % u];
178 		/* Work out B + 1 first then can use B as tmp space */
179 		if (!BN_bin2bn (B, v, Bpl1)) goto err;
180 		if (!BN_add_word (Bpl1, 1)) goto err;
181 		for (j = 0; j < Ilen ; j+=v) {
182 			if (!BN_bin2bn (I + j, v, Ij)) goto err;
183 			if (!BN_add (Ij, Ij, Bpl1)) goto err;
184 			BN_bn2bin (Ij, B);
185 			Ijlen = BN_num_bytes (Ij);
186 			/* If more than 2^(v*8) - 1 cut off MSB */
187 			if (Ijlen > v) {
188 				BN_bn2bin (Ij, B);
189 				memcpy (I + j, B + 1, v);
190 #ifndef PKCS12_BROKEN_KEYGEN
191 			/* If less than v bytes pad with zeroes */
192 			} else if (Ijlen < v) {
193 				memset(I + j, 0, v - Ijlen);
194 				BN_bn2bin(Ij, I + j + v - Ijlen);
195 #endif
196 			} else BN_bn2bin (Ij, I + j);
197 		}
198 	}
199 
200 err:
201 	PKCS12err(PKCS12_F_PKCS12_KEY_GEN_UNI,ERR_R_MALLOC_FAILURE);
202 
203 end:
204 	OPENSSL_free (Ai);
205 	OPENSSL_free (B);
206 	OPENSSL_free (D);
207 	OPENSSL_free (I);
208 	BN_free (Ij);
209 	BN_free (Bpl1);
210 	EVP_MD_CTX_cleanup(&ctx);
211 	return ret;
212 }
213 #ifdef DEBUG_KEYGEN
214 void h__dump (unsigned char *p, int len)
215 {
216 	for (; len --; p++) fprintf(stderr, "%02X", *p);
217 	fprintf(stderr, "\n");
218 }
219 #endif
220