p_open.c revision 296465 
1/* crypto/evp/p_open.c */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to.  The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 *    notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 *    notice, this list of conditions and the following disclaimer in the
30 *    documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 *    must display the following acknowledgement:
33 *    "This product includes cryptographic software written by
34 *     Eric Young (eay@cryptsoft.com)"
35 *    The word 'cryptographic' can be left out if the rouines from the library
36 *    being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 *    the apps directory (application code) you must include an acknowledgement:
39 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed.  i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59#include <stdio.h>
60#include "cryptlib.h"
61
62#ifndef OPENSSL_NO_RSA
63
64# include <openssl/evp.h>
65# include <openssl/objects.h>
66# include <openssl/x509.h>
67# include <openssl/rsa.h>
68
69int EVP_OpenInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *type,
70                 const unsigned char *ek, int ekl, const unsigned char *iv,
71                 EVP_PKEY *priv)
72{
73    unsigned char *key = NULL;
74    int i, size = 0, ret = 0;
75
76    if (type) {
77        EVP_CIPHER_CTX_init(ctx);
78        if (!EVP_DecryptInit_ex(ctx, type, NULL, NULL, NULL))
79            return 0;
80    }
81
82    if (!priv)
83        return 1;
84
85    if (priv->type != EVP_PKEY_RSA) {
86        EVPerr(EVP_F_EVP_OPENINIT, EVP_R_PUBLIC_KEY_NOT_RSA);
87        goto err;
88    }
89
90    size = RSA_size(priv->pkey.rsa);
91    key = (unsigned char *)OPENSSL_malloc(size + 2);
92    if (key == NULL) {
93        /* ERROR */
94        EVPerr(EVP_F_EVP_OPENINIT, ERR_R_MALLOC_FAILURE);
95        goto err;
96    }
97
98    i = EVP_PKEY_decrypt(key, ek, ekl, priv);
99    if ((i <= 0) || !EVP_CIPHER_CTX_set_key_length(ctx, i)) {
100        /* ERROR */
101        goto err;
102    }
103    if (!EVP_DecryptInit_ex(ctx, NULL, NULL, key, iv))
104        goto err;
105
106    ret = 1;
107 err:
108    if (key != NULL)
109        OPENSSL_cleanse(key, size);
110    OPENSSL_free(key);
111    return (ret);
112}
113
114int EVP_OpenFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
115{
116    int i;
117
118    i = EVP_DecryptFinal_ex(ctx, out, outl);
119    EVP_DecryptInit_ex(ctx, NULL, NULL, NULL, NULL);
120    return (i);
121}
122#else                           /* !OPENSSL_NO_RSA */
123
124# ifdef PEDANTIC
125static void *dummy = &dummy;
126# endif
127
128#endif
129