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>
68extern BIO *bio_err;
69void 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
77int 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
103int 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
206void h__dump (unsigned char *p, int len)
207{
208	for (; len --; p++) fprintf(stderr, "%02X", *p);
209	fprintf(stderr, "\n");
210}
211#endif
212