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#ifdef OPENSSL_FIPS
64# include <openssl/fips.h>
65# include "evp_locl.h"
66#endif
67
68int EVP_CIPHER_param_to_asn1(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
69{
70    int ret;
71
72    if (c->cipher->set_asn1_parameters != NULL)
73        ret = c->cipher->set_asn1_parameters(c, type);
74    else if (c->cipher->flags & EVP_CIPH_FLAG_DEFAULT_ASN1) {
75        switch (EVP_CIPHER_CTX_mode(c)) {
76        case EVP_CIPH_WRAP_MODE:
77            if (EVP_CIPHER_CTX_nid(c) == NID_id_smime_alg_CMS3DESwrap)
78                ASN1_TYPE_set(type, V_ASN1_NULL, NULL);
79            ret = 1;
80            break;
81
82        case EVP_CIPH_GCM_MODE:
83        case EVP_CIPH_CCM_MODE:
84        case EVP_CIPH_XTS_MODE:
85            ret = -1;
86            break;
87
88        default:
89            ret = EVP_CIPHER_set_asn1_iv(c, type);
90        }
91    } else
92        ret = -1;
93    return (ret);
94}
95
96int EVP_CIPHER_asn1_to_param(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
97{
98    int ret;
99
100    if (c->cipher->get_asn1_parameters != NULL)
101        ret = c->cipher->get_asn1_parameters(c, type);
102    else if (c->cipher->flags & EVP_CIPH_FLAG_DEFAULT_ASN1) {
103        switch (EVP_CIPHER_CTX_mode(c)) {
104
105        case EVP_CIPH_WRAP_MODE:
106            ret = 1;
107            break;
108
109        case EVP_CIPH_GCM_MODE:
110        case EVP_CIPH_CCM_MODE:
111        case EVP_CIPH_XTS_MODE:
112            ret = -1;
113            break;
114
115        default:
116            ret = EVP_CIPHER_get_asn1_iv(c, type);
117            break;
118        }
119    } else
120        ret = -1;
121    return (ret);
122}
123
124int EVP_CIPHER_get_asn1_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
125{
126    int i = 0;
127    unsigned int l;
128
129    if (type != NULL) {
130        l = EVP_CIPHER_CTX_iv_length(c);
131        OPENSSL_assert(l <= sizeof(c->iv));
132        i = ASN1_TYPE_get_octetstring(type, c->oiv, l);
133        if (i != (int)l)
134            return (-1);
135        else if (i > 0)
136            memcpy(c->iv, c->oiv, l);
137    }
138    return (i);
139}
140
141int EVP_CIPHER_set_asn1_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
142{
143    int i = 0;
144    unsigned int j;
145
146    if (type != NULL) {
147        j = EVP_CIPHER_CTX_iv_length(c);
148        OPENSSL_assert(j <= sizeof(c->iv));
149        i = ASN1_TYPE_set_octetstring(type, c->oiv, j);
150    }
151    return (i);
152}
153
154/* Convert the various cipher NIDs and dummies to a proper OID NID */
155int EVP_CIPHER_type(const EVP_CIPHER *ctx)
156{
157    int nid;
158    ASN1_OBJECT *otmp;
159    nid = EVP_CIPHER_nid(ctx);
160
161    switch (nid) {
162
163    case NID_rc2_cbc:
164    case NID_rc2_64_cbc:
165    case NID_rc2_40_cbc:
166
167        return NID_rc2_cbc;
168
169    case NID_rc4:
170    case NID_rc4_40:
171
172        return NID_rc4;
173
174    case NID_aes_128_cfb128:
175    case NID_aes_128_cfb8:
176    case NID_aes_128_cfb1:
177
178        return NID_aes_128_cfb128;
179
180    case NID_aes_192_cfb128:
181    case NID_aes_192_cfb8:
182    case NID_aes_192_cfb1:
183
184        return NID_aes_192_cfb128;
185
186    case NID_aes_256_cfb128:
187    case NID_aes_256_cfb8:
188    case NID_aes_256_cfb1:
189
190        return NID_aes_256_cfb128;
191
192    case NID_des_cfb64:
193    case NID_des_cfb8:
194    case NID_des_cfb1:
195
196        return NID_des_cfb64;
197
198    case NID_des_ede3_cfb64:
199    case NID_des_ede3_cfb8:
200    case NID_des_ede3_cfb1:
201
202        return NID_des_cfb64;
203
204    default:
205        /* Check it has an OID and it is valid */
206        otmp = OBJ_nid2obj(nid);
207        if (!otmp || !otmp->data)
208            nid = NID_undef;
209        ASN1_OBJECT_free(otmp);
210        return nid;
211    }
212}
213
214int EVP_CIPHER_block_size(const EVP_CIPHER *e)
215{
216    return e->block_size;
217}
218
219int EVP_CIPHER_CTX_block_size(const EVP_CIPHER_CTX *ctx)
220{
221    return ctx->cipher->block_size;
222}
223
224int EVP_Cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
225               const unsigned char *in, unsigned int inl)
226{
227    return ctx->cipher->do_cipher(ctx, out, in, inl);
228}
229
230const EVP_CIPHER *EVP_CIPHER_CTX_cipher(const EVP_CIPHER_CTX *ctx)
231{
232    return ctx->cipher;
233}
234
235unsigned long EVP_CIPHER_flags(const EVP_CIPHER *cipher)
236{
237#ifdef OPENSSL_FIPS
238    const EVP_CIPHER *fcipher;
239    fcipher = evp_get_fips_cipher(cipher);
240    if (fcipher && fcipher->flags & EVP_CIPH_FLAG_FIPS)
241        return cipher->flags | EVP_CIPH_FLAG_FIPS;
242#endif
243    return cipher->flags;
244}
245
246unsigned long EVP_CIPHER_CTX_flags(const EVP_CIPHER_CTX *ctx)
247{
248#ifdef OPENSSL_FIPS
249    return EVP_CIPHER_flags(ctx->cipher);
250#else
251    return ctx->cipher->flags;
252#endif
253}
254
255void *EVP_CIPHER_CTX_get_app_data(const EVP_CIPHER_CTX *ctx)
256{
257    return ctx->app_data;
258}
259
260void EVP_CIPHER_CTX_set_app_data(EVP_CIPHER_CTX *ctx, void *data)
261{
262    ctx->app_data = data;
263}
264
265int EVP_CIPHER_iv_length(const EVP_CIPHER *cipher)
266{
267    return cipher->iv_len;
268}
269
270int EVP_CIPHER_CTX_iv_length(const EVP_CIPHER_CTX *ctx)
271{
272    return ctx->cipher->iv_len;
273}
274
275int EVP_CIPHER_key_length(const EVP_CIPHER *cipher)
276{
277    return cipher->key_len;
278}
279
280int EVP_CIPHER_CTX_key_length(const EVP_CIPHER_CTX *ctx)
281{
282    return ctx->key_len;
283}
284
285int EVP_CIPHER_nid(const EVP_CIPHER *cipher)
286{
287    return cipher->nid;
288}
289
290int EVP_CIPHER_CTX_nid(const EVP_CIPHER_CTX *ctx)
291{
292    return ctx->cipher->nid;
293}
294
295int EVP_MD_block_size(const EVP_MD *md)
296{
297    return md->block_size;
298}
299
300int EVP_MD_type(const EVP_MD *md)
301{
302    return md->type;
303}
304
305int EVP_MD_pkey_type(const EVP_MD *md)
306{
307    return md->pkey_type;
308}
309
310int EVP_MD_size(const EVP_MD *md)
311{
312    if (!md) {
313        EVPerr(EVP_F_EVP_MD_SIZE, EVP_R_MESSAGE_DIGEST_IS_NULL);
314        return -1;
315    }
316    return md->md_size;
317}
318
319#ifdef OPENSSL_FIPS
320
321const EVP_MD *evp_get_fips_md(const EVP_MD *md)
322{
323    int nid = EVP_MD_type(md);
324    if (nid == NID_dsa)
325        return FIPS_evp_dss1();
326    else if (nid == NID_dsaWithSHA)
327        return FIPS_evp_dss();
328    else if (nid == NID_ecdsa_with_SHA1)
329        return FIPS_evp_ecdsa();
330    else
331        return FIPS_get_digestbynid(nid);
332}
333
334const EVP_CIPHER *evp_get_fips_cipher(const EVP_CIPHER *cipher)
335{
336    int nid = cipher->nid;
337    if (nid == NID_undef)
338        return FIPS_evp_enc_null();
339    else
340        return FIPS_get_cipherbynid(nid);
341}
342
343#endif
344
345unsigned long EVP_MD_flags(const EVP_MD *md)
346{
347#ifdef OPENSSL_FIPS
348    const EVP_MD *fmd;
349    fmd = evp_get_fips_md(md);
350    if (fmd && fmd->flags & EVP_MD_FLAG_FIPS)
351        return md->flags | EVP_MD_FLAG_FIPS;
352#endif
353    return md->flags;
354}
355
356const EVP_MD *EVP_MD_CTX_md(const EVP_MD_CTX *ctx)
357{
358    if (!ctx)
359        return NULL;
360    return ctx->digest;
361}
362
363void EVP_MD_CTX_set_flags(EVP_MD_CTX *ctx, int flags)
364{
365    ctx->flags |= flags;
366}
367
368void EVP_MD_CTX_clear_flags(EVP_MD_CTX *ctx, int flags)
369{
370    ctx->flags &= ~flags;
371}
372
373int EVP_MD_CTX_test_flags(const EVP_MD_CTX *ctx, int flags)
374{
375    return (ctx->flags & flags);
376}
377
378void EVP_CIPHER_CTX_set_flags(EVP_CIPHER_CTX *ctx, int flags)
379{
380    ctx->flags |= flags;
381}
382
383void EVP_CIPHER_CTX_clear_flags(EVP_CIPHER_CTX *ctx, int flags)
384{
385    ctx->flags &= ~flags;
386}
387
388int EVP_CIPHER_CTX_test_flags(const EVP_CIPHER_CTX *ctx, int flags)
389{
390    return (ctx->flags & flags);
391}
392