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1/* crypto/evp/evp_lib.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#include <openssl/evp.h>
62#include <openssl/objects.h>
63
64int EVP_CIPHER_param_to_asn1(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
65 {
66 int ret;
67
68 if (c->cipher->set_asn1_parameters != NULL)
69 ret=c->cipher->set_asn1_parameters(c,type);
70 else
71 ret=1;
72 return(ret);
73 }
74
75int EVP_CIPHER_asn1_to_param(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
76 {
77 int ret;
78
79 if (c->cipher->get_asn1_parameters != NULL)
80 ret=c->cipher->get_asn1_parameters(c,type);
81 else
82 ret=1;
83 return(ret);
84 }
85
86int EVP_CIPHER_get_asn1_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
87 {
88 int i=0,l;
89
90 if (type != NULL)
91 {
92 l=EVP_CIPHER_CTX_iv_length(c);
93 OPENSSL_assert(l <= sizeof c->iv);
94 i=ASN1_TYPE_get_octetstring(type,c->oiv,l);
95 if (i != l)
96 return(-1);
97 else if (i > 0)
98 memcpy(c->iv,c->oiv,l);
99 }
100 return(i);
101 }
102
103int EVP_CIPHER_set_asn1_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
104 {
105 int i=0,j;
106
107 if (type != NULL)
108 {
109 j=EVP_CIPHER_CTX_iv_length(c);
110 OPENSSL_assert(j <= sizeof c->iv);
111 i=ASN1_TYPE_set_octetstring(type,c->oiv,j);
112 }
113 return(i);
114 }
115
116/* Convert the various cipher NIDs and dummies to a proper OID NID */
117int EVP_CIPHER_type(const EVP_CIPHER *ctx)
118{
119 int nid;
120 ASN1_OBJECT *otmp;
121 nid = EVP_CIPHER_nid(ctx);
122
123 switch(nid) {
124
125 case NID_rc2_cbc:
126 case NID_rc2_64_cbc:
127 case NID_rc2_40_cbc:
128
129 return NID_rc2_cbc;
130
131 case NID_rc4:
132 case NID_rc4_40:
133
134 return NID_rc4;
135
136 default:
137 /* Check it has an OID and it is valid */
138 otmp = OBJ_nid2obj(nid);
139 if(!otmp || !otmp->data) nid = NID_undef;
140 ASN1_OBJECT_free(otmp);
141 return nid;
142 }
143}
144
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