p12_decr.c revision 280304 
1/* p12_decr.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
64/* Define this to dump decrypted output to files called DERnnn */
65/*
66 * #define DEBUG_DECRYPT
67 */
68
69/*
70 * Encrypt/Decrypt a buffer based on password and algor, result in a
71 * OPENSSL_malloc'ed buffer
72 */
73
74unsigned char *PKCS12_pbe_crypt(X509_ALGOR *algor, const char *pass,
75                                int passlen, unsigned char *in, int inlen,
76                                unsigned char **data, int *datalen, int en_de)
77{
78    unsigned char *out;
79    int outlen, i;
80    EVP_CIPHER_CTX ctx;
81
82    EVP_CIPHER_CTX_init(&ctx);
83    /* Decrypt data */
84    if (!EVP_PBE_CipherInit(algor->algorithm, pass, passlen,
85                            algor->parameter, &ctx, en_de)) {
86        PKCS12err(PKCS12_F_PKCS12_PBE_CRYPT,
87                  PKCS12_R_PKCS12_ALGOR_CIPHERINIT_ERROR);
88        return NULL;
89    }
90
91    if (!(out = OPENSSL_malloc(inlen + EVP_CIPHER_CTX_block_size(&ctx)))) {
92        PKCS12err(PKCS12_F_PKCS12_PBE_CRYPT, ERR_R_MALLOC_FAILURE);
93        goto err;
94    }
95
96    if (!EVP_CipherUpdate(&ctx, out, &i, in, inlen)) {
97        OPENSSL_free(out);
98        out = NULL;
99        PKCS12err(PKCS12_F_PKCS12_PBE_CRYPT, ERR_R_EVP_LIB);
100        goto err;
101    }
102
103    outlen = i;
104    if (!EVP_CipherFinal_ex(&ctx, out + i, &i)) {
105        OPENSSL_free(out);
106        out = NULL;
107        PKCS12err(PKCS12_F_PKCS12_PBE_CRYPT,
108                  PKCS12_R_PKCS12_CIPHERFINAL_ERROR);
109        goto err;
110    }
111    outlen += i;
112    if (datalen)
113        *datalen = outlen;
114    if (data)
115        *data = out;
116 err:
117    EVP_CIPHER_CTX_cleanup(&ctx);
118    return out;
119
120}
121
122/*
123 * Decrypt an OCTET STRING and decode ASN1 structure if zbuf set zero buffer
124 * after use.
125 */
126
127void *PKCS12_item_decrypt_d2i(X509_ALGOR *algor, const ASN1_ITEM *it,
128                              const char *pass, int passlen,
129                              ASN1_OCTET_STRING *oct, int zbuf)
130{
131    unsigned char *out;
132    const unsigned char *p;
133    void *ret;
134    int outlen;
135
136    if (!PKCS12_pbe_crypt(algor, pass, passlen, oct->data, oct->length,
137                          &out, &outlen, 0)) {
138        PKCS12err(PKCS12_F_PKCS12_ITEM_DECRYPT_D2I,
139                  PKCS12_R_PKCS12_PBE_CRYPT_ERROR);
140        return NULL;
141    }
142    p = out;
143#ifdef DEBUG_DECRYPT
144    {
145        FILE *op;
146
147        char fname[30];
148        static int fnm = 1;
149        sprintf(fname, "DER%d", fnm++);
150        op = fopen(fname, "wb");
151        fwrite(p, 1, outlen, op);
152        fclose(op);
153    }
154#endif
155    ret = ASN1_item_d2i(NULL, &p, outlen, it);
156    if (zbuf)
157        OPENSSL_cleanse(out, outlen);
158    if (!ret)
159        PKCS12err(PKCS12_F_PKCS12_ITEM_DECRYPT_D2I, PKCS12_R_DECODE_ERROR);
160    OPENSSL_free(out);
161    return ret;
162}
163
164/*
165 * Encode ASN1 structure and encrypt, return OCTET STRING if zbuf set zero
166 * encoding.
167 */
168
169ASN1_OCTET_STRING *PKCS12_item_i2d_encrypt(X509_ALGOR *algor,
170                                           const ASN1_ITEM *it,
171                                           const char *pass, int passlen,
172                                           void *obj, int zbuf)
173{
174    ASN1_OCTET_STRING *oct;
175    unsigned char *in = NULL;
176    int inlen;
177    if (!(oct = M_ASN1_OCTET_STRING_new())) {
178        PKCS12err(PKCS12_F_PKCS12_ITEM_I2D_ENCRYPT, ERR_R_MALLOC_FAILURE);
179        return NULL;
180    }
181    inlen = ASN1_item_i2d(obj, &in, it);
182    if (!in) {
183        PKCS12err(PKCS12_F_PKCS12_ITEM_I2D_ENCRYPT, PKCS12_R_ENCODE_ERROR);
184        return NULL;
185    }
186    if (!PKCS12_pbe_crypt(algor, pass, passlen, in, inlen, &oct->data,
187                          &oct->length, 1)) {
188        PKCS12err(PKCS12_F_PKCS12_ITEM_I2D_ENCRYPT, PKCS12_R_ENCRYPT_ERROR);
189        OPENSSL_free(in);
190        return NULL;
191    }
192    if (zbuf)
193        OPENSSL_cleanse(in, inlen);
194    OPENSSL_free(in);
195    return oct;
196}
197
198IMPLEMENT_PKCS12_STACK_OF(PKCS7)
199