evp_lib.c revision 194206 
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 if (c->cipher->flags & EVP_CIPH_FLAG_DEFAULT_ASN1)
71		ret=EVP_CIPHER_set_asn1_iv(c, type);
72	else
73		ret=-1;
74	return(ret);
75	}
76
77int EVP_CIPHER_asn1_to_param(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
78	{
79	int ret;
80
81	if (c->cipher->get_asn1_parameters != NULL)
82		ret=c->cipher->get_asn1_parameters(c,type);
83	else if (c->cipher->flags & EVP_CIPH_FLAG_DEFAULT_ASN1)
84		ret=EVP_CIPHER_get_asn1_iv(c, type);
85	else
86		ret=-1;
87	return(ret);
88	}
89
90int EVP_CIPHER_get_asn1_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
91	{
92	int i=0;
93	unsigned int l;
94
95	if (type != NULL)
96		{
97		l=EVP_CIPHER_CTX_iv_length(c);
98		OPENSSL_assert(l <= sizeof(c->iv));
99		i=ASN1_TYPE_get_octetstring(type,c->oiv,l);
100		if (i != (int)l)
101			return(-1);
102		else if (i > 0)
103			memcpy(c->iv,c->oiv,l);
104		}
105	return(i);
106	}
107
108int EVP_CIPHER_set_asn1_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
109	{
110	int i=0;
111	unsigned int j;
112
113	if (type != NULL)
114		{
115		j=EVP_CIPHER_CTX_iv_length(c);
116		OPENSSL_assert(j <= sizeof(c->iv));
117		i=ASN1_TYPE_set_octetstring(type,c->oiv,j);
118		}
119	return(i);
120	}
121
122/* Convert the various cipher NIDs and dummies to a proper OID NID */
123int EVP_CIPHER_type(const EVP_CIPHER *ctx)
124{
125	int nid;
126	ASN1_OBJECT *otmp;
127	nid = EVP_CIPHER_nid(ctx);
128
129	switch(nid) {
130
131		case NID_rc2_cbc:
132		case NID_rc2_64_cbc:
133		case NID_rc2_40_cbc:
134
135		return NID_rc2_cbc;
136
137		case NID_rc4:
138		case NID_rc4_40:
139
140		return NID_rc4;
141
142		case NID_aes_128_cfb128:
143		case NID_aes_128_cfb8:
144		case NID_aes_128_cfb1:
145
146		return NID_aes_128_cfb128;
147
148		case NID_aes_192_cfb128:
149		case NID_aes_192_cfb8:
150		case NID_aes_192_cfb1:
151
152		return NID_aes_192_cfb128;
153
154		case NID_aes_256_cfb128:
155		case NID_aes_256_cfb8:
156		case NID_aes_256_cfb1:
157
158		return NID_aes_256_cfb128;
159
160		case NID_des_cfb64:
161		case NID_des_cfb8:
162		case NID_des_cfb1:
163
164		return NID_des_cfb64;
165
166		default:
167		/* Check it has an OID and it is valid */
168		otmp = OBJ_nid2obj(nid);
169		if(!otmp || !otmp->data) nid = NID_undef;
170		ASN1_OBJECT_free(otmp);
171		return nid;
172	}
173}
174
175int EVP_CIPHER_block_size(const EVP_CIPHER *e)
176	{
177	return e->block_size;
178	}
179
180int EVP_CIPHER_CTX_block_size(const EVP_CIPHER_CTX *ctx)
181	{
182	return ctx->cipher->block_size;
183	}
184
185const EVP_CIPHER *EVP_CIPHER_CTX_cipher(const EVP_CIPHER_CTX *ctx)
186	{
187	return ctx->cipher;
188	}
189
190unsigned long EVP_CIPHER_flags(const EVP_CIPHER *cipher)
191	{
192	return cipher->flags;
193	}
194
195void *EVP_CIPHER_CTX_get_app_data(const EVP_CIPHER_CTX *ctx)
196	{
197	return ctx->app_data;
198	}
199
200void EVP_CIPHER_CTX_set_app_data(EVP_CIPHER_CTX *ctx, void *data)
201	{
202	ctx->app_data = data;
203	}
204
205int EVP_CIPHER_iv_length(const EVP_CIPHER *cipher)
206	{
207	return cipher->iv_len;
208	}
209
210int EVP_CIPHER_key_length(const EVP_CIPHER *cipher)
211	{
212	return cipher->key_len;
213	}
214
215int EVP_CIPHER_CTX_key_length(const EVP_CIPHER_CTX *ctx)
216	{
217	return ctx->key_len;
218	}
219
220int EVP_CIPHER_CTX_nid(const EVP_CIPHER_CTX *ctx)
221	{
222	return ctx->cipher->nid;
223	}
224
225int EVP_MD_block_size(const EVP_MD *md)
226	{
227	return md->block_size;
228	}
229
230int EVP_MD_type(const EVP_MD *md)
231	{
232	return md->type;
233	}
234
235int EVP_MD_pkey_type(const EVP_MD *md)
236	{
237	return md->pkey_type;
238	}
239
240int EVP_MD_size(const EVP_MD *md)
241	{
242	return md->md_size;
243	}
244
245const EVP_MD * EVP_MD_CTX_md(const EVP_MD_CTX *ctx)
246	{
247	return ctx->digest;
248	}
249
250void EVP_MD_CTX_set_flags(EVP_MD_CTX *ctx, int flags)
251	{
252	ctx->flags |= flags;
253	}
254
255void EVP_MD_CTX_clear_flags(EVP_MD_CTX *ctx, int flags)
256	{
257	ctx->flags &= ~flags;
258	}
259
260int EVP_MD_CTX_test_flags(const EVP_MD_CTX *ctx, int flags)
261	{
262	return (ctx->flags & flags);
263	}
264
265void EVP_CIPHER_CTX_set_flags(EVP_CIPHER_CTX *ctx, int flags)
266	{
267	ctx->flags |= flags;
268	}
269
270void EVP_CIPHER_CTX_clear_flags(EVP_CIPHER_CTX *ctx, int flags)
271	{
272	ctx->flags &= ~flags;
273	}
274
275int EVP_CIPHER_CTX_test_flags(const EVP_CIPHER_CTX *ctx, int flags)
276	{
277	return (ctx->flags & flags);
278	}
279