evp_lib.c revision 291721 
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        switch (EVP_CIPHER_CTX_mode(c)) {
72
73        case EVP_CIPH_GCM_MODE:
74        case EVP_CIPH_CCM_MODE:
75        case EVP_CIPH_XTS_MODE:
76            ret = -1;
77            break;
78
79        default:
80            ret = EVP_CIPHER_set_asn1_iv(c, type);
81        }
82    } else
83        ret = -1;
84    return (ret);
85}
86
87int EVP_CIPHER_asn1_to_param(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
88{
89    int ret;
90
91    if (c->cipher->get_asn1_parameters != NULL)
92        ret = c->cipher->get_asn1_parameters(c, type);
93    else if (c->cipher->flags & EVP_CIPH_FLAG_DEFAULT_ASN1) {
94        switch (EVP_CIPHER_CTX_mode(c)) {
95
96        case EVP_CIPH_GCM_MODE:
97        case EVP_CIPH_CCM_MODE:
98        case EVP_CIPH_XTS_MODE:
99            ret = -1;
100            break;
101
102        default:
103            ret = EVP_CIPHER_get_asn1_iv(c, type);
104            break;
105        }
106    } else
107        ret = -1;
108    return (ret);
109}
110
111int EVP_CIPHER_get_asn1_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
112{
113    int i = 0;
114    unsigned int l;
115
116    if (type != NULL) {
117        l = EVP_CIPHER_CTX_iv_length(c);
118        OPENSSL_assert(l <= sizeof(c->iv));
119        i = ASN1_TYPE_get_octetstring(type, c->oiv, l);
120        if (i != (int)l)
121            return (-1);
122        else if (i > 0)
123            memcpy(c->iv, c->oiv, l);
124    }
125    return (i);
126}
127
128int EVP_CIPHER_set_asn1_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
129{
130    int i = 0;
131    unsigned int j;
132
133    if (type != NULL) {
134        j = EVP_CIPHER_CTX_iv_length(c);
135        OPENSSL_assert(j <= sizeof(c->iv));
136        i = ASN1_TYPE_set_octetstring(type, c->oiv, j);
137    }
138    return (i);
139}
140
141/* Convert the various cipher NIDs and dummies to a proper OID NID */
142int EVP_CIPHER_type(const EVP_CIPHER *ctx)
143{
144    int nid;
145    ASN1_OBJECT *otmp;
146    nid = EVP_CIPHER_nid(ctx);
147
148    switch (nid) {
149
150    case NID_rc2_cbc:
151    case NID_rc2_64_cbc:
152    case NID_rc2_40_cbc:
153
154        return NID_rc2_cbc;
155
156    case NID_rc4:
157    case NID_rc4_40:
158
159        return NID_rc4;
160
161    case NID_aes_128_cfb128:
162    case NID_aes_128_cfb8:
163    case NID_aes_128_cfb1:
164
165        return NID_aes_128_cfb128;
166
167    case NID_aes_192_cfb128:
168    case NID_aes_192_cfb8:
169    case NID_aes_192_cfb1:
170
171        return NID_aes_192_cfb128;
172
173    case NID_aes_256_cfb128:
174    case NID_aes_256_cfb8:
175    case NID_aes_256_cfb1:
176
177        return NID_aes_256_cfb128;
178
179    case NID_des_cfb64:
180    case NID_des_cfb8:
181    case NID_des_cfb1:
182
183        return NID_des_cfb64;
184
185    case NID_des_ede3_cfb64:
186    case NID_des_ede3_cfb8:
187    case NID_des_ede3_cfb1:
188
189        return NID_des_cfb64;
190
191    default:
192        /* Check it has an OID and it is valid */
193        otmp = OBJ_nid2obj(nid);
194        if (!otmp || !otmp->data)
195            nid = NID_undef;
196        ASN1_OBJECT_free(otmp);
197        return nid;
198    }
199}
200
201int EVP_CIPHER_block_size(const EVP_CIPHER *e)
202{
203    return e->block_size;
204}
205
206int EVP_CIPHER_CTX_block_size(const EVP_CIPHER_CTX *ctx)
207{
208    return ctx->cipher->block_size;
209}
210
211int EVP_Cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
212               const unsigned char *in, unsigned int inl)
213{
214    return ctx->cipher->do_cipher(ctx, out, in, inl);
215}
216
217const EVP_CIPHER *EVP_CIPHER_CTX_cipher(const EVP_CIPHER_CTX *ctx)
218{
219    return ctx->cipher;
220}
221
222unsigned long EVP_CIPHER_flags(const EVP_CIPHER *cipher)
223{
224    return cipher->flags;
225}
226
227unsigned long EVP_CIPHER_CTX_flags(const EVP_CIPHER_CTX *ctx)
228{
229    return ctx->cipher->flags;
230}
231
232void *EVP_CIPHER_CTX_get_app_data(const EVP_CIPHER_CTX *ctx)
233{
234    return ctx->app_data;
235}
236
237void EVP_CIPHER_CTX_set_app_data(EVP_CIPHER_CTX *ctx, void *data)
238{
239    ctx->app_data = data;
240}
241
242int EVP_CIPHER_iv_length(const EVP_CIPHER *cipher)
243{
244    return cipher->iv_len;
245}
246
247int EVP_CIPHER_CTX_iv_length(const EVP_CIPHER_CTX *ctx)
248{
249    return ctx->cipher->iv_len;
250}
251
252int EVP_CIPHER_key_length(const EVP_CIPHER *cipher)
253{
254    return cipher->key_len;
255}
256
257int EVP_CIPHER_CTX_key_length(const EVP_CIPHER_CTX *ctx)
258{
259    return ctx->key_len;
260}
261
262int EVP_CIPHER_nid(const EVP_CIPHER *cipher)
263{
264    return cipher->nid;
265}
266
267int EVP_CIPHER_CTX_nid(const EVP_CIPHER_CTX *ctx)
268{
269    return ctx->cipher->nid;
270}
271
272int EVP_MD_block_size(const EVP_MD *md)
273{
274    return md->block_size;
275}
276
277int EVP_MD_type(const EVP_MD *md)
278{
279    return md->type;
280}
281
282int EVP_MD_pkey_type(const EVP_MD *md)
283{
284    return md->pkey_type;
285}
286
287int EVP_MD_size(const EVP_MD *md)
288{
289    if (!md) {
290        EVPerr(EVP_F_EVP_MD_SIZE, EVP_R_MESSAGE_DIGEST_IS_NULL);
291        return -1;
292    }
293    return md->md_size;
294}
295
296unsigned long EVP_MD_flags(const EVP_MD *md)
297{
298    return md->flags;
299}
300
301const EVP_MD *EVP_MD_CTX_md(const EVP_MD_CTX *ctx)
302{
303    if (!ctx)
304        return NULL;
305    return ctx->digest;
306}
307
308void EVP_MD_CTX_set_flags(EVP_MD_CTX *ctx, int flags)
309{
310    ctx->flags |= flags;
311}
312
313void EVP_MD_CTX_clear_flags(EVP_MD_CTX *ctx, int flags)
314{
315    ctx->flags &= ~flags;
316}
317
318int EVP_MD_CTX_test_flags(const EVP_MD_CTX *ctx, int flags)
319{
320    return (ctx->flags & flags);
321}
322
323void EVP_CIPHER_CTX_set_flags(EVP_CIPHER_CTX *ctx, int flags)
324{
325    ctx->flags |= flags;
326}
327
328void EVP_CIPHER_CTX_clear_flags(EVP_CIPHER_CTX *ctx, int flags)
329{
330    ctx->flags &= ~flags;
331}
332
333int EVP_CIPHER_CTX_test_flags(const EVP_CIPHER_CTX *ctx, int flags)
334{
335    return (ctx->flags & flags);
336}
337