p12_key.c revision 296465 
1/* p12_key.c */
2/*
3 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
4 * 1999.
5 */
6/* ====================================================================
7 * Copyright (c) 1999 The OpenSSL Project.  All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in
18 *    the documentation and/or other materials provided with the
19 *    distribution.
20 *
21 * 3. All advertising materials mentioning features or use of this
22 *    software must display the following acknowledgment:
23 *    "This product includes software developed by the OpenSSL Project
24 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 *
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 *    endorse or promote products derived from this software without
28 *    prior written permission. For written permission, please contact
29 *    licensing@OpenSSL.org.
30 *
31 * 5. Products derived from this software may not be called "OpenSSL"
32 *    nor may "OpenSSL" appear in their names without prior written
33 *    permission of the OpenSSL Project.
34 *
35 * 6. Redistributions of any form whatsoever must retain the following
36 *    acknowledgment:
37 *    "This product includes software developed by the OpenSSL Project
38 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
53 *
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com).  This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com).
57 *
58 */
59
60#include <stdio.h>
61#include "cryptlib.h"
62#include <openssl/pkcs12.h>
63#include <openssl/bn.h>
64
65/* Uncomment out this line to get debugging info about key generation */
66/*
67 * #define DEBUG_KEYGEN
68 */
69#ifdef DEBUG_KEYGEN
70# include <openssl/bio.h>
71extern BIO *bio_err;
72void h__dump(unsigned char *p, int len);
73#endif
74
75#ifdef OPENSSL_SYS_NETWARE
76/* Rename these functions to avoid name clashes on NetWare OS */
77# define uni2asc OPENSSL_uni2asc
78# define asc2uni OPENSSL_asc2uni
79#endif
80
81/* PKCS12 compatible key/IV generation */
82#ifndef min
83# define min(a,b) ((a) < (b) ? (a) : (b))
84#endif
85
86int PKCS12_key_gen_asc(const char *pass, int passlen, unsigned char *salt,
87                       int saltlen, int id, int iter, int n,
88                       unsigned char *out, const EVP_MD *md_type)
89{
90    int ret;
91    unsigned char *unipass;
92    int uniplen;
93    if (!pass) {
94        unipass = NULL;
95        uniplen = 0;
96    } else if (!asc2uni(pass, passlen, &unipass, &uniplen)) {
97        PKCS12err(PKCS12_F_PKCS12_KEY_GEN_ASC, ERR_R_MALLOC_FAILURE);
98        return 0;
99    }
100    ret = PKCS12_key_gen_uni(unipass, uniplen, salt, saltlen,
101                             id, iter, n, out, md_type);
102    if (unipass) {
103        OPENSSL_cleanse(unipass, uniplen); /* Clear password from memory */
104        OPENSSL_free(unipass);
105    }
106    return ret;
107}
108
109int PKCS12_key_gen_uni(unsigned char *pass, int passlen, unsigned char *salt,
110                       int saltlen, int id, int iter, int n,
111                       unsigned char *out, const EVP_MD *md_type)
112{
113    unsigned char *B, *D, *I, *p, *Ai;
114    int Slen, Plen, Ilen, Ijlen;
115    int i, j, u, v;
116    int ret = 0;
117    BIGNUM *Ij, *Bpl1;          /* These hold Ij and B + 1 */
118    EVP_MD_CTX ctx;
119#ifdef  DEBUG_KEYGEN
120    unsigned char *tmpout = out;
121    int tmpn = n;
122#endif
123
124#if 0
125    if (!pass) {
126        PKCS12err(PKCS12_F_PKCS12_KEY_GEN_UNI, ERR_R_PASSED_NULL_PARAMETER);
127        return 0;
128    }
129#endif
130
131    EVP_MD_CTX_init(&ctx);
132#ifdef  DEBUG_KEYGEN
133    fprintf(stderr, "KEYGEN DEBUG\n");
134    fprintf(stderr, "ID %d, ITER %d\n", id, iter);
135    fprintf(stderr, "Password (length %d):\n", passlen);
136    h__dump(pass, passlen);
137    fprintf(stderr, "Salt (length %d):\n", saltlen);
138    h__dump(salt, saltlen);
139#endif
140    v = EVP_MD_block_size(md_type);
141    u = EVP_MD_size(md_type);
142    D = OPENSSL_malloc(v);
143    Ai = OPENSSL_malloc(u);
144    B = OPENSSL_malloc(v + 1);
145    Slen = v * ((saltlen + v - 1) / v);
146    if (passlen)
147        Plen = v * ((passlen + v - 1) / v);
148    else
149        Plen = 0;
150    Ilen = Slen + Plen;
151    I = OPENSSL_malloc(Ilen);
152    Ij = BN_new();
153    Bpl1 = BN_new();
154    if (!D || !Ai || !B || !I || !Ij || !Bpl1)
155        goto err;
156    for (i = 0; i < v; i++)
157        D[i] = id;
158    p = I;
159    for (i = 0; i < Slen; i++)
160        *p++ = salt[i % saltlen];
161    for (i = 0; i < Plen; i++)
162        *p++ = pass[i % passlen];
163    for (;;) {
164        EVP_DigestInit_ex(&ctx, md_type, NULL);
165        EVP_DigestUpdate(&ctx, D, v);
166        EVP_DigestUpdate(&ctx, I, Ilen);
167        EVP_DigestFinal_ex(&ctx, Ai, NULL);
168        for (j = 1; j < iter; j++) {
169            EVP_DigestInit_ex(&ctx, md_type, NULL);
170            EVP_DigestUpdate(&ctx, Ai, u);
171            EVP_DigestFinal_ex(&ctx, Ai, NULL);
172        }
173        memcpy(out, Ai, min(n, u));
174        if (u >= n) {
175#ifdef DEBUG_KEYGEN
176            fprintf(stderr, "Output KEY (length %d)\n", tmpn);
177            h__dump(tmpout, tmpn);
178#endif
179            ret = 1;
180            goto end;
181        }
182        n -= u;
183        out += u;
184        for (j = 0; j < v; j++)
185            B[j] = Ai[j % u];
186        /* Work out B + 1 first then can use B as tmp space */
187        if (!BN_bin2bn(B, v, Bpl1))
188            goto err;
189        if (!BN_add_word(Bpl1, 1))
190            goto err;
191        for (j = 0; j < Ilen; j += v) {
192            if (!BN_bin2bn(I + j, v, Ij))
193                goto err;
194            if (!BN_add(Ij, Ij, Bpl1))
195                goto err;
196            BN_bn2bin(Ij, B);
197            Ijlen = BN_num_bytes(Ij);
198            /* If more than 2^(v*8) - 1 cut off MSB */
199            if (Ijlen > v) {
200                BN_bn2bin(Ij, B);
201                memcpy(I + j, B + 1, v);
202#ifndef PKCS12_BROKEN_KEYGEN
203                /* If less than v bytes pad with zeroes */
204            } else if (Ijlen < v) {
205                memset(I + j, 0, v - Ijlen);
206                BN_bn2bin(Ij, I + j + v - Ijlen);
207#endif
208            } else
209                BN_bn2bin(Ij, I + j);
210        }
211    }
212
213 err:
214    PKCS12err(PKCS12_F_PKCS12_KEY_GEN_UNI, ERR_R_MALLOC_FAILURE);
215
216 end:
217    OPENSSL_free(Ai);
218    OPENSSL_free(B);
219    OPENSSL_free(D);
220    OPENSSL_free(I);
221    BN_free(Ij);
222    BN_free(Bpl1);
223    EVP_MD_CTX_cleanup(&ctx);
224    return ret;
225}
226
227#ifdef DEBUG_KEYGEN
228void h__dump(unsigned char *p, int len)
229{
230    for (; len--; p++)
231        fprintf(stderr, "%02X", *p);
232    fprintf(stderr, "\n");
233}
234#endif
235