aboutsummaryrefslogtreecommitdiffstats
path: root/crypto/pkcs12/p12_key.c
blob: 5cfe7278df757799703a9669edaa40da2b8915b9 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
/* p12_key.c */
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
 * project 1999.
 */
/* ====================================================================
 * Copyright (c) 1999 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    licensing@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

#include <stdio.h>
#include "cryptlib.h"
#include <openssl/pkcs12.h>
#include <openssl/bn.h>

/* Uncomment out this line to get debugging info about key generation */
/*#define DEBUG_KEYGEN*/
#ifdef DEBUG_KEYGEN
#include <openssl/bio.h>
extern BIO *bio_err;
void h__dump (unsigned char *p, int len);
#endif

#ifdef OPENSSL_SYS_NETWARE
/* Rename these functions to avoid name clashes on NetWare OS */
#define uni2asc OPENSSL_uni2asc
#define asc2uni OPENSSL_asc2uni
#endif

/* PKCS12 compatible key/IV generation */
#ifndef min
#define min(a,b) ((a) < (b) ? (a) : (b))
#endif

int 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)
{
	int ret;
	unsigned char *unipass;
	int uniplen;
	if(!pass) {
		unipass = NULL;
		uniplen = 0;
	} else if (!asc2uni(pass, passlen, &unipass, &uniplen)) {
		PKCS12err(PKCS12_F_PKCS12_KEY_GEN_ASC,ERR_R_MALLOC_FAILURE);
		return 0;
	}
	ret = PKCS12_key_gen_uni(unipass, uniplen, salt, saltlen,
						 id, iter, n, out, md_type);
	if(unipass) {
		OPENSSL_cleanse(unipass, uniplen);	/* Clear password from memory */
		OPENSSL_free(unipass);
	}
	return ret;
}

int 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)
{
	unsigned char *B, *D, *I, *p, *Ai;
	int Slen, Plen, Ilen, Ijlen;
	int i, j, u, v;
	BIGNUM *Ij, *Bpl1;	/* These hold Ij and B + 1 */
	EVP_MD_CTX ctx;
#ifdef  DEBUG_KEYGEN
	unsigned char *tmpout = out;
	int tmpn = n;
#endif

#if 0
	if (!pass) {
		PKCS12err(PKCS12_F_PKCS12_KEY_GEN_UNI,ERR_R_PASSED_NULL_PARAMETER);
		return 0;
	}
#endif

	EVP_MD_CTX_init(&ctx);
#ifdef  DEBUG_KEYGEN
	fprintf(stderr, "KEYGEN DEBUG\n");
	fprintf(stderr, "ID %d, ITER %d\n", id, iter);
	fprintf(stderr, "Password (length %d):\n", passlen);
	h__dump(pass, passlen);
	fprintf(stderr, "Salt (length %d):\n", saltlen);
	h__dump(salt, saltlen);
#endif
	v = EVP_MD_block_size (md_type);
	u = EVP_MD_size (md_type);
	D = OPENSSL_malloc (v);
	Ai = OPENSSL_malloc (u);
	B = OPENSSL_malloc (v + 1);
	Slen = v * ((saltlen+v-1)/v);
	if(passlen) Plen = v * ((passlen+v-1)/v);
	else Plen = 0;
	Ilen = Slen + Plen;
	I = OPENSSL_malloc (Ilen);
	Ij = BN_new();
	Bpl1 = BN_new();
	if (!D || !Ai || !B || !I || !Ij || !Bpl1) {
		PKCS12err(PKCS12_F_PKCS12_KEY_GEN_UNI,ERR_R_MALLOC_FAILURE);
		return 0;
	}
	for (i = 0; i < v; i++) D[i] = id;
	p = I;
	for (i = 0; i < Slen; i++) *p++ = salt[i % saltlen];
	for (i = 0; i < Plen; i++) *p++ = pass[i % passlen];
	for (;;) {
		EVP_DigestInit_ex(&ctx, md_type, NULL);
		EVP_DigestUpdate(&ctx, D, v);
		EVP_DigestUpdate(&ctx, I, Ilen);
		EVP_DigestFinal_ex(&ctx, Ai, NULL);
		for (j = 1; j < iter; j++) {
			EVP_DigestInit_ex(&ctx, md_type, NULL);
			EVP_DigestUpdate(&ctx, Ai, u);
			EVP_DigestFinal_ex(&ctx, Ai, NULL);
		}
		memcpy (out, Ai, min (n, u));
		if (u >= n) {
			OPENSSL_free (Ai);
			OPENSSL_free (B);
			OPENSSL_free (D);
			OPENSSL_free (I);
			BN_free (Ij);
			BN_free (Bpl1);
			EVP_MD_CTX_cleanup(&ctx);
#ifdef DEBUG_KEYGEN
			fprintf(stderr, "Output KEY (length %d)\n", tmpn);
			h__dump(tmpout, tmpn);
#endif
			return 1;	
		}
		n -= u;
		out += u;
		for (j = 0; j < v; j++) B[j] = Ai[j % u];
		/* Work out B + 1 first then can use B as tmp space */
		BN_bin2bn (B, v, Bpl1);
		BN_add_word (Bpl1, 1);
		for (j = 0; j < Ilen ; j+=v) {
			BN_bin2bn (I + j, v, Ij);
			BN_add (Ij, Ij, Bpl1);
			BN_bn2bin (Ij, B);
			Ijlen = BN_num_bytes (Ij);
			/* If more than 2^(v*8) - 1 cut off MSB */
			if (Ijlen > v) {
				BN_bn2bin (Ij, B);
				memcpy (I + j, B + 1, v);
#ifndef PKCS12_BROKEN_KEYGEN
			/* If less than v bytes pad with zeroes */
			} else if (Ijlen < v) {
				memset(I + j, 0, v - Ijlen);
				BN_bn2bin(Ij, I + j + v - Ijlen); 
#endif
			} else BN_bn2bin (Ij, I + j);
		}
	}
}
#ifdef DEBUG_KEYGEN
void h__dump (unsigned char *p, int len)
{
	for (; len --; p++) fprintf(stderr, "%02X", *p);
	fprintf(stderr, "\n");	
}
#endif