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 
64 int 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 
77 int 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 
90 int 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 
108 int 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 */
123 int 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 		case NID_des_ede3_cfb64:
167 		case NID_des_ede3_cfb8:
168 		case NID_des_ede3_cfb1:
169 
170 		return NID_des_cfb64;
171 
172 		default:
173 		/* Check it has an OID and it is valid */
174 		otmp = OBJ_nid2obj(nid);
175 		if(!otmp || !otmp->data) nid = NID_undef;
176 		ASN1_OBJECT_free(otmp);
177 		return nid;
178 	}
179 }
180 
181 int EVP_CIPHER_block_size(const EVP_CIPHER *e)
182 	{
183 	return e->block_size;
184 	}
185 
186 int EVP_CIPHER_CTX_block_size(const EVP_CIPHER_CTX *ctx)
187 	{
188 	return ctx->cipher->block_size;
189 	}
190 
191 int EVP_Cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, unsigned int inl)
192 	{
193 	return ctx->cipher->do_cipher(ctx,out,in,inl);
194 	}
195 
196 const EVP_CIPHER *EVP_CIPHER_CTX_cipher(const EVP_CIPHER_CTX *ctx)
197 	{
198 	return ctx->cipher;
199 	}
200 
201 unsigned long EVP_CIPHER_flags(const EVP_CIPHER *cipher)
202 	{
203 	return cipher->flags;
204 	}
205 
206 unsigned long EVP_CIPHER_CTX_flags(const EVP_CIPHER_CTX *ctx)
207 	{
208 	return ctx->cipher->flags;
209 	}
210 
211 void *EVP_CIPHER_CTX_get_app_data(const EVP_CIPHER_CTX *ctx)
212 	{
213 	return ctx->app_data;
214 	}
215 
216 void EVP_CIPHER_CTX_set_app_data(EVP_CIPHER_CTX *ctx, void *data)
217 	{
218 	ctx->app_data = data;
219 	}
220 
221 int EVP_CIPHER_iv_length(const EVP_CIPHER *cipher)
222 	{
223 	return cipher->iv_len;
224 	}
225 
226 int EVP_CIPHER_CTX_iv_length(const EVP_CIPHER_CTX *ctx)
227 	{
228 	return ctx->cipher->iv_len;
229 	}
230 
231 int EVP_CIPHER_key_length(const EVP_CIPHER *cipher)
232 	{
233 	return cipher->key_len;
234 	}
235 
236 int EVP_CIPHER_CTX_key_length(const EVP_CIPHER_CTX *ctx)
237 	{
238 	return ctx->key_len;
239 	}
240 
241 int EVP_CIPHER_nid(const EVP_CIPHER *cipher)
242 	{
243 	return cipher->nid;
244 	}
245 
246 int EVP_CIPHER_CTX_nid(const EVP_CIPHER_CTX *ctx)
247 	{
248 	return ctx->cipher->nid;
249 	}
250 
251 int EVP_MD_block_size(const EVP_MD *md)
252 	{
253 	return md->block_size;
254 	}
255 
256 int EVP_MD_type(const EVP_MD *md)
257 	{
258 	return md->type;
259 	}
260 
261 int EVP_MD_pkey_type(const EVP_MD *md)
262 	{
263 	return md->pkey_type;
264 	}
265 
266 int EVP_MD_size(const EVP_MD *md)
267 	{
268 	if (!md)
269 		{
270 		EVPerr(EVP_F_EVP_MD_SIZE, EVP_R_MESSAGE_DIGEST_IS_NULL);
271 		return -1;
272 		}
273 	return md->md_size;
274 	}
275 
276 unsigned long EVP_MD_flags(const EVP_MD *md)
277 	{
278 	return md->flags;
279 	}
280 
281 const EVP_MD *EVP_MD_CTX_md(const EVP_MD_CTX *ctx)
282 	{
283 	if (!ctx)
284 		return NULL;
285 	return ctx->digest;
286 	}
287 
288 void EVP_MD_CTX_set_flags(EVP_MD_CTX *ctx, int flags)
289 	{
290 	ctx->flags |= flags;
291 	}
292 
293 void EVP_MD_CTX_clear_flags(EVP_MD_CTX *ctx, int flags)
294 	{
295 	ctx->flags &= ~flags;
296 	}
297 
298 int EVP_MD_CTX_test_flags(const EVP_MD_CTX *ctx, int flags)
299 	{
300 	return (ctx->flags & flags);
301 	}
302 
303 void EVP_CIPHER_CTX_set_flags(EVP_CIPHER_CTX *ctx, int flags)
304 	{
305 	ctx->flags |= flags;
306 	}
307 
308 void EVP_CIPHER_CTX_clear_flags(EVP_CIPHER_CTX *ctx, int flags)
309 	{
310 	ctx->flags &= ~flags;
311 	}
312 
313 int EVP_CIPHER_CTX_test_flags(const EVP_CIPHER_CTX *ctx, int flags)
314 	{
315 	return (ctx->flags & flags);
316 	}
317