1 /* $OpenBSD: p_open.c,v 1.19 2017/05/02 03:59:44 deraadt Exp $ */
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 <string.h>
61 
62 #include <openssl/opensslconf.h>
63 
64 #ifndef OPENSSL_NO_RSA
65 
66 #include <openssl/err.h>
67 #include <openssl/evp.h>
68 #include <openssl/objects.h>
69 #include <openssl/rsa.h>
70 #include <openssl/x509.h>
71 
72 int
EVP_OpenInit(EVP_CIPHER_CTX * ctx,const EVP_CIPHER * type,const unsigned char * ek,int ekl,const unsigned char * iv,EVP_PKEY * priv)73 EVP_OpenInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *type,
74     const unsigned char *ek, int ekl, const unsigned char *iv, EVP_PKEY *priv)
75 {
76 	unsigned char *key = NULL;
77 	int i, size = 0, ret = 0;
78 
79 	if (type) {
80 		EVP_CIPHER_CTX_init(ctx);
81 		if (!EVP_DecryptInit_ex(ctx, type, NULL, NULL, NULL))
82 			return 0;
83 	}
84 
85 	if (!priv)
86 		return 1;
87 
88 	if (priv->type != EVP_PKEY_RSA) {
89 		EVPerror(EVP_R_PUBLIC_KEY_NOT_RSA);
90 		goto err;
91 	}
92 
93 	size = RSA_size(priv->pkey.rsa);
94 	key = malloc(size + 2);
95 	if (key == NULL) {
96 		/* ERROR */
97 		EVPerror(ERR_R_MALLOC_FAILURE);
98 		goto err;
99 	}
100 
101 	i = EVP_PKEY_decrypt_old(key, ek, ekl, priv);
102 	if ((i <= 0) || !EVP_CIPHER_CTX_set_key_length(ctx, i)) {
103 		/* ERROR */
104 		goto err;
105 	}
106 	if (!EVP_DecryptInit_ex(ctx, NULL, NULL, key, iv))
107 		goto err;
108 
109 	ret = 1;
110 
111 err:
112 	freezero(key, size);
113 	return (ret);
114 }
115 
116 int
EVP_OpenFinal(EVP_CIPHER_CTX * ctx,unsigned char * out,int * outl)117 EVP_OpenFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
118 {
119 	int i;
120 
121 	i = EVP_DecryptFinal_ex(ctx, out, outl);
122 	if (i)
123 		i = EVP_DecryptInit_ex(ctx, NULL, NULL, NULL, NULL);
124 	return (i);
125 }
126 #endif
127