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p_seal.c
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1 /* crypto/evp/p_seal.c */
2 /* Copyright (C) 1995-1998 Eric Young ([email protected])
3  * All rights reserved.
4  *
5  * This package is an SSL implementation written
6  * by Eric Young ([email protected]).
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 ([email protected]).
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 ([email protected])"
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 ([email protected])"
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 #include <openssl/rand.h>
62 #ifndef OPENSSL_NO_RSA
63 #include <openssl/rsa.h>
64 #endif
65 #include <openssl/evp.h>
66 #include <openssl/objects.h>
67 #include <openssl/x509.h>
68 
69 int EVP_SealInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *type, unsigned char **ek,
70  int *ekl, unsigned char *iv, EVP_PKEY **pubk, int npubk)
71  {
72  unsigned char key[EVP_MAX_KEY_LENGTH];
73  int i;
74 
75  if(type) {
77  if(!EVP_EncryptInit_ex(ctx,type,NULL,NULL,NULL)) return 0;
78  }
79  if ((npubk <= 0) || !pubk)
80  return 1;
81  if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)
82  return 0;
83  if (EVP_CIPHER_CTX_iv_length(ctx))
85 
86  if(!EVP_EncryptInit_ex(ctx,NULL,NULL,key,iv)) return 0;
87 
88  for (i=0; i<npubk; i++)
89  {
90  ekl[i]=EVP_PKEY_encrypt_old(ek[i],key,EVP_CIPHER_CTX_key_length(ctx),
91  pubk[i]);
92  if (ekl[i] <= 0) return(-1);
93  }
94  return(npubk);
95  }
96 
97 /* MACRO
98 void EVP_SealUpdate(ctx,out,outl,in,inl)
99 EVP_CIPHER_CTX *ctx;
100 unsigned char *out;
101 int *outl;
102 unsigned char *in;
103 int inl;
104  {
105  EVP_EncryptUpdate(ctx,out,outl,in,inl);
106  }
107 */
108 
109 int EVP_SealFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
110  {
111  int i;
112  i = EVP_EncryptFinal_ex(ctx,out,outl);
113  if (i)
114  i = EVP_EncryptInit_ex(ctx,NULL,NULL,NULL,NULL);
115  return i;
116  }