p12_key.c revision 55714
1/* p12_key.c */
2/* Written by Dr Stephen N Henson (shenson@bigfoot.com) 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
63
64/* Uncomment out this line to get debugging info about key generation */
65/*#define DEBUG_KEYGEN*/
66#ifdef DEBUG_KEYGEN
67#include <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	if (!asc2uni (pass, &unipass, &uniplen)) {
85		PKCS12err(PKCS12_F_PKCS12_KEY_GEN_ASC,ERR_R_MALLOC_FAILURE);
86		return 0;
87	}
88	ret = PKCS12_key_gen_uni (unipass, uniplen, salt, saltlen,
89						 id, iter, n, out, md_type);
90	memset(unipass, 0, uniplen);	/* Clear password from memory */
91	Free(unipass);
92	return ret;
93}
94
95int PKCS12_key_gen_uni (unsigned char *pass, int passlen, unsigned char *salt,
96	     int saltlen, int id, int iter, int n, unsigned char *out,
97	     const EVP_MD *md_type)
98{
99	unsigned char *B, *D, *I, *p, *Ai;
100	int Slen, Plen, Ilen;
101	int i, j, u, v;
102	BIGNUM *Ij, *Bpl1;	/* These hold Ij and B + 1 */
103	EVP_MD_CTX ctx;
104#ifdef  DEBUG_KEYGEN
105	unsigned char *tmpout = out;
106	int tmpn = n;
107	BIO_printf (bio_err, "KEYGEN DEBUG\n");
108	BIO_printf (bio_err, "ID %d, ITER %d\n", id, iter);
109	BIO_printf (bio_err, "Password (length %d):\n", passlen);
110	h__dump (pass, passlen);
111	BIO_printf (bio_err, "Salt (length %d):\n", saltlen);
112	h__dump (salt, saltlen);
113	BIO_printf (bio_err, "ID %d, ITER %d\n\n", id, iter);
114#endif
115	v = EVP_MD_block_size (md_type);
116	u = EVP_MD_size (md_type);
117	D = Malloc (v);
118	Ai = Malloc (u);
119	B = Malloc (v + 1);
120	Slen = v * ((saltlen+v-1)/v);
121	Plen = v * ((passlen+v-1)/v);
122	Ilen = Slen + Plen;
123	I = Malloc (Ilen);
124	Ij = BN_new();
125	Bpl1 = BN_new();
126	if (!D || !Ai || !B || !I || !Ij || !Bpl1) {
127		PKCS12err(PKCS12_F_PKCS12_KEY_GEN_UNI,ERR_R_MALLOC_FAILURE);
128		return 0;
129	}
130	for (i = 0; i < v; i++) D[i] = id;
131	p = I;
132	for (i = 0; i < Slen; i++) *p++ = salt[i % saltlen];
133	for (i = 0; i < Plen; i++) *p++ = pass[i % passlen];
134	for (;;) {
135		EVP_DigestInit (&ctx, md_type);
136		EVP_DigestUpdate (&ctx, D, v);
137		EVP_DigestUpdate (&ctx, I, Ilen);
138		EVP_DigestFinal (&ctx, Ai, NULL);
139		for (j = 1; j < iter; j++) {
140			EVP_DigestInit (&ctx, md_type);
141			EVP_DigestUpdate (&ctx, Ai, u);
142			EVP_DigestFinal (&ctx, Ai, NULL);
143		}
144		memcpy (out, Ai, min (n, u));
145		if (u >= n) {
146			Free (Ai);
147			Free (B);
148			Free (D);
149			Free (I);
150			BN_free (Ij);
151			BN_free (Bpl1);
152#ifdef DEBUG_KEYGEN
153			BIO_printf (bio_err, "Output KEY (length %d)\n", tmpn);
154			h__dump (tmpout, tmpn);
155#endif
156			return 1;
157		}
158		n -= u;
159		out += u;
160		for (j = 0; j < v; j++) B[j] = Ai[j % u];
161		/* Work out B + 1 first then can use B as tmp space */
162		BN_bin2bn (B, v, Bpl1);
163		BN_add_word (Bpl1, 1);
164		for (j = 0; j < Ilen ; j+=v) {
165			BN_bin2bn (I + j, v, Ij);
166			BN_add (Ij, Ij, Bpl1);
167			BN_bn2bin (Ij, B);
168			/* If more than 2^(v*8) - 1 cut off MSB */
169			if (BN_num_bytes (Ij) > v) {
170				BN_bn2bin (Ij, B);
171				memcpy (I + j, B + 1, v);
172			} else BN_bn2bin (Ij, I + j);
173		}
174	}
175}
176#ifdef DEBUG_KEYGEN
177void h__dump (unsigned char *p, int len)
178{
179	for (; len --; p++) BIO_printf (bio_err, "%02X", *p);
180	BIO_printf (bio_err, "\n");
181}
182#endif
183