1 /* crypto/evp/enc_min.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
61 #include <openssl/evp.h>
62 #include <openssl/err.h>
63 #include <openssl/rand.h>
64 #ifndef OPENSSL_NO_ENGINE
65 # include <openssl/engine.h>
69 void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX
*ctx
)
72 FIPS_selftest_check();
74 memset(ctx
, 0, sizeof(EVP_CIPHER_CTX
));
75 /* ctx->cipher=NULL; */
81 * The purpose of these is to trap programs that attempt to use non FIPS
82 * algorithms in FIPS mode and ignore the errors.
85 static int bad_init(EVP_CIPHER_CTX
*ctx
, const unsigned char *key
,
86 const unsigned char *iv
, int enc
)
88 FIPS_ERROR_IGNORED("Cipher init");
92 static int bad_do_cipher(EVP_CIPHER_CTX
*ctx
, unsigned char *out
,
93 const unsigned char *in
, unsigned int inl
)
95 FIPS_ERROR_IGNORED("Cipher update");
99 /* NB: no cleanup because it is allowed after failed init */
101 static int bad_set_asn1(EVP_CIPHER_CTX
*ctx
, ASN1_TYPE
*typ
)
103 FIPS_ERROR_IGNORED("Cipher set_asn1");
107 static int bad_get_asn1(EVP_CIPHER_CTX
*ctx
, ASN1_TYPE
*typ
)
109 FIPS_ERROR_IGNORED("Cipher get_asn1");
113 static int bad_ctrl(EVP_CIPHER_CTX
*ctx
, int type
, int arg
, void *ptr
)
115 FIPS_ERROR_IGNORED("Cipher ctrl");
119 static const EVP_CIPHER bad_cipher
= {
137 #ifndef OPENSSL_NO_ENGINE
141 static int do_engine_null(ENGINE
*impl
)
146 static int do_evp_enc_engine_null(EVP_CIPHER_CTX
*ctx
,
147 const EVP_CIPHER
**pciph
, ENGINE
*impl
)
152 static int (*do_engine_finish
) (ENGINE
*impl
)
155 static int (*do_evp_enc_engine
)
156 (EVP_CIPHER_CTX
*ctx
, const EVP_CIPHER
**pciph
, ENGINE
*impl
)
157 = do_evp_enc_engine_null
;
159 void int_EVP_CIPHER_set_engine_callbacks(int (*eng_ciph_fin
) (ENGINE
*impl
),
161 (EVP_CIPHER_CTX
*ctx
,
162 const EVP_CIPHER
**pciph
,
165 do_engine_finish
= eng_ciph_fin
;
166 do_evp_enc_engine
= eng_ciph_evp
;
171 # define do_engine_finish ENGINE_finish
173 static int do_evp_enc_engine(EVP_CIPHER_CTX
*ctx
, const EVP_CIPHER
**pcipher
,
177 if (!ENGINE_init(impl
)) {
178 EVPerr(EVP_F_DO_EVP_ENC_ENGINE
, EVP_R_INITIALIZATION_ERROR
);
182 /* Ask if an ENGINE is reserved for this job */
183 impl
= ENGINE_get_cipher_engine((*pcipher
)->nid
);
185 /* There's an ENGINE for this job ... (apparently) */
186 const EVP_CIPHER
*c
= ENGINE_get_cipher(impl
, (*pcipher
)->nid
);
189 * One positive side-effect of US's export control history, is
190 * that we should at least be able to avoid using US mispellings
191 * of "initialisation"?
193 EVPerr(EVP_F_DO_EVP_ENC_ENGINE
, EVP_R_INITIALIZATION_ERROR
);
196 /* We'll use the ENGINE's private cipher definition */
199 * Store the ENGINE functional reference so we know 'cipher' came
200 * from an ENGINE and we need to release it when done.
212 int EVP_CipherInit_ex(EVP_CIPHER_CTX
*ctx
, const EVP_CIPHER
*cipher
,
213 ENGINE
*impl
, const unsigned char *key
,
214 const unsigned char *iv
, int enc
)
224 if (FIPS_selftest_failed()) {
225 FIPSerr(FIPS_F_EVP_CIPHERINIT_EX
, FIPS_R_FIPS_SELFTEST_FAILED
);
226 ctx
->cipher
= &bad_cipher
;
230 #ifndef OPENSSL_NO_ENGINE
232 * Whether it's nice or not, "Inits" can be used on "Final"'d contexts so
233 * this context may already have an ENGINE! Try to avoid releasing the
234 * previous handle, re-querying for an ENGINE, and having a
235 * reinitialisation, when it may all be unecessary.
237 if (ctx
->engine
&& ctx
->cipher
&& (!cipher
||
245 * Ensure a context left lying around from last time is cleared (the
246 * previous check attempted to avoid this if the same ENGINE and
247 * EVP_CIPHER could be used).
249 EVP_CIPHER_CTX_cleanup(ctx
);
251 /* Restore encrypt field: it is zeroed by cleanup */
253 #ifndef OPENSSL_NO_ENGINE
254 if (!do_evp_enc_engine(ctx
, &cipher
, impl
))
258 ctx
->cipher
= cipher
;
259 if (ctx
->cipher
->ctx_size
) {
260 ctx
->cipher_data
= OPENSSL_malloc(ctx
->cipher
->ctx_size
);
261 if (!ctx
->cipher_data
) {
262 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, ERR_R_MALLOC_FAILURE
);
266 ctx
->cipher_data
= NULL
;
268 ctx
->key_len
= cipher
->key_len
;
270 if (ctx
->cipher
->flags
& EVP_CIPH_CTRL_INIT
) {
271 if (!EVP_CIPHER_CTX_ctrl(ctx
, EVP_CTRL_INIT
, 0, NULL
)) {
272 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, EVP_R_INITIALIZATION_ERROR
);
276 } else if (!ctx
->cipher
) {
277 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, EVP_R_NO_CIPHER_SET
);
280 #ifndef OPENSSL_NO_ENGINE
283 /* we assume block size is a power of 2 in *cryptUpdate */
284 OPENSSL_assert(ctx
->cipher
->block_size
== 1
285 || ctx
->cipher
->block_size
== 8
286 || ctx
->cipher
->block_size
== 16);
288 if (!(EVP_CIPHER_CTX_flags(ctx
) & EVP_CIPH_CUSTOM_IV
)) {
289 switch (EVP_CIPHER_CTX_mode(ctx
)) {
291 case EVP_CIPH_STREAM_CIPHER
:
292 case EVP_CIPH_ECB_MODE
:
295 case EVP_CIPH_CFB_MODE
:
296 case EVP_CIPH_OFB_MODE
:
301 case EVP_CIPH_CBC_MODE
:
303 OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx
) <=
304 (int)sizeof(ctx
->iv
));
306 memcpy(ctx
->oiv
, iv
, EVP_CIPHER_CTX_iv_length(ctx
));
307 memcpy(ctx
->iv
, ctx
->oiv
, EVP_CIPHER_CTX_iv_length(ctx
));
317 * After 'key' is set no further parameters changes are permissible. So
318 * only check for non FIPS enabling at this point.
320 if (key
&& FIPS_mode()) {
321 if (!(ctx
->cipher
->flags
& EVP_CIPH_FLAG_FIPS
)
322 & !(ctx
->flags
& EVP_CIPH_FLAG_NON_FIPS_ALLOW
)) {
323 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, EVP_R_DISABLED_FOR_FIPS
);
325 ERR_add_error_data(2, "cipher=", EVP_CIPHER_name(ctx
->cipher
));
327 ctx
->cipher
= &bad_cipher
;
333 if (key
|| (ctx
->cipher
->flags
& EVP_CIPH_ALWAYS_CALL_INIT
)) {
334 if (!ctx
->cipher
->init(ctx
, key
, iv
, enc
))
339 ctx
->block_mask
= ctx
->cipher
->block_size
- 1;
343 int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX
*c
)
345 if (c
->cipher
!= NULL
) {
346 if (c
->cipher
->cleanup
&& !c
->cipher
->cleanup(c
))
348 /* Cleanse cipher context data */
350 OPENSSL_cleanse(c
->cipher_data
, c
->cipher
->ctx_size
);
353 OPENSSL_free(c
->cipher_data
);
354 #ifndef OPENSSL_NO_ENGINE
357 * The EVP_CIPHER we used belongs to an ENGINE, release the
358 * functional reference we held for this reason.
360 do_engine_finish(c
->engine
);
362 memset(c
, 0, sizeof(EVP_CIPHER_CTX
));
366 int EVP_Cipher(EVP_CIPHER_CTX
*ctx
, unsigned char *out
,
367 const unsigned char *in
, unsigned int inl
)
370 FIPS_selftest_check();
372 return ctx
->cipher
->do_cipher(ctx
, out
, in
, inl
);
375 int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX
*ctx
, int type
, int arg
, void *ptr
)
379 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL
, EVP_R_NO_CIPHER_SET
);
383 if (!ctx
->cipher
->ctrl
) {
384 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL
, EVP_R_CTRL_NOT_IMPLEMENTED
);
388 ret
= ctx
->cipher
->ctrl(ctx
, type
, arg
, ptr
);
390 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL
,
391 EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED
);
397 unsigned long EVP_CIPHER_CTX_flags(const EVP_CIPHER_CTX
*ctx
)
399 return ctx
->cipher
->flags
;
402 int EVP_CIPHER_CTX_iv_length(const EVP_CIPHER_CTX
*ctx
)
404 return ctx
->cipher
->iv_len
;
407 int EVP_CIPHER_nid(const EVP_CIPHER
*cipher
)