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
69 int 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)) return 0;
79 }
80
81 if(!priv) return 1;
82
83 if (priv->type != EVP_PKEY_RSA)
84 {
85 EVPerr(EVP_F_EVP_OPENINIT,EVP_R_PUBLIC_KEY_NOT_RSA);
86 goto err;
87 }
88
89 size=RSA_size(priv->pkey.rsa);
90 key=(unsigned char *)OPENSSL_malloc(size+2);
91 if (key == NULL)
92 {
93 /* ERROR */
94 EVPerr(EVP_F_EVP_OPENINIT,ERR_R_MALLOC_FAILURE);
95 goto err;
96 }
97
98 i=EVP_PKEY_decrypt_old(key,ek,ekl,priv);
99 if ((i <= 0) || !EVP_CIPHER_CTX_set_key_length(ctx, i))
100 {
101 /* ERROR */
102 goto err;
103 }
104 if(!EVP_DecryptInit_ex(ctx,NULL,NULL,key,iv)) goto err;
105
106 ret=1;
107 err:
108 if (key != NULL) OPENSSL_cleanse(key,size);
109 OPENSSL_free(key);
110 return(ret);
111 }
112
113 int EVP_OpenFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
114 {
115 int i;
116
117 i=EVP_DecryptFinal_ex(ctx,out,outl);
118 if (i)
119 i = EVP_DecryptInit_ex(ctx,NULL,NULL,NULL,NULL);
120 return(i);
121 }
122 #else /* !OPENSSL_NO_RSA */
123
124 # ifdef PEDANTIC
125 static void *dummy=&dummy;
126 # endif
127
128 #endif