1 /* crypto/evp/evp_enc.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.]
60 #include "internal/cryptlib.h"
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 const char EVP_version
[] = "EVP" OPENSSL_VERSION_PTEXT
;
71 void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX
*ctx
)
73 memset(ctx
, 0, sizeof(*ctx
));
76 EVP_CIPHER_CTX
*EVP_CIPHER_CTX_new(void)
78 EVP_CIPHER_CTX
*ctx
= OPENSSL_malloc(sizeof(*ctx
));
80 EVP_CIPHER_CTX_init(ctx
);
84 int EVP_CipherInit(EVP_CIPHER_CTX
*ctx
, const EVP_CIPHER
*cipher
,
85 const unsigned char *key
, const unsigned char *iv
, int enc
)
88 EVP_CIPHER_CTX_init(ctx
);
89 return EVP_CipherInit_ex(ctx
, cipher
, NULL
, key
, iv
, enc
);
92 int EVP_CipherInit_ex(EVP_CIPHER_CTX
*ctx
, const EVP_CIPHER
*cipher
,
93 ENGINE
*impl
, const unsigned char *key
,
94 const unsigned char *iv
, int enc
)
103 #ifndef OPENSSL_NO_ENGINE
105 * Whether it's nice or not, "Inits" can be used on "Final"'d contexts so
106 * this context may already have an ENGINE! Try to avoid releasing the
107 * previous handle, re-querying for an ENGINE, and having a
108 * reinitialisation, when it may all be unecessary.
110 if (ctx
->engine
&& ctx
->cipher
&& (!cipher
||
118 * Ensure a context left lying around from last time is cleared (the
119 * previous check attempted to avoid this if the same ENGINE and
120 * EVP_CIPHER could be used).
123 unsigned long flags
= ctx
->flags
;
124 EVP_CIPHER_CTX_cleanup(ctx
);
125 /* Restore encrypt and flags */
129 #ifndef OPENSSL_NO_ENGINE
131 if (!ENGINE_init(impl
)) {
132 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, EVP_R_INITIALIZATION_ERROR
);
136 /* Ask if an ENGINE is reserved for this job */
137 impl
= ENGINE_get_cipher_engine(cipher
->nid
);
139 /* There's an ENGINE for this job ... (apparently) */
140 const EVP_CIPHER
*c
= ENGINE_get_cipher(impl
, cipher
->nid
);
143 * One positive side-effect of US's export control history,
144 * is that we should at least be able to avoid using US
145 * mispellings of "initialisation"?
147 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, EVP_R_INITIALIZATION_ERROR
);
150 /* We'll use the ENGINE's private cipher definition */
153 * Store the ENGINE functional reference so we know 'cipher' came
154 * from an ENGINE and we need to release it when done.
161 ctx
->cipher
= cipher
;
162 if (ctx
->cipher
->ctx_size
) {
163 ctx
->cipher_data
= OPENSSL_malloc(ctx
->cipher
->ctx_size
);
164 if (!ctx
->cipher_data
) {
165 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, ERR_R_MALLOC_FAILURE
);
168 memset(ctx
->cipher_data
, 0, ctx
->cipher
->ctx_size
);
170 ctx
->cipher_data
= NULL
;
172 ctx
->key_len
= cipher
->key_len
;
173 /* Preserve wrap enable flag, zero everything else */
174 ctx
->flags
&= EVP_CIPHER_CTX_FLAG_WRAP_ALLOW
;
175 if (ctx
->cipher
->flags
& EVP_CIPH_CTRL_INIT
) {
176 if (!EVP_CIPHER_CTX_ctrl(ctx
, EVP_CTRL_INIT
, 0, NULL
)) {
177 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, EVP_R_INITIALIZATION_ERROR
);
181 } else if (!ctx
->cipher
) {
182 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, EVP_R_NO_CIPHER_SET
);
185 #ifndef OPENSSL_NO_ENGINE
188 /* we assume block size is a power of 2 in *cryptUpdate */
189 OPENSSL_assert(ctx
->cipher
->block_size
== 1
190 || ctx
->cipher
->block_size
== 8
191 || ctx
->cipher
->block_size
== 16);
193 if (!(ctx
->flags
& EVP_CIPHER_CTX_FLAG_WRAP_ALLOW
)
194 && EVP_CIPHER_CTX_mode(ctx
) == EVP_CIPH_WRAP_MODE
) {
195 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, EVP_R_WRAP_MODE_NOT_ALLOWED
);
199 if (!(EVP_CIPHER_CTX_flags(ctx
) & EVP_CIPH_CUSTOM_IV
)) {
200 switch (EVP_CIPHER_CTX_mode(ctx
)) {
202 case EVP_CIPH_STREAM_CIPHER
:
203 case EVP_CIPH_ECB_MODE
:
206 case EVP_CIPH_CFB_MODE
:
207 case EVP_CIPH_OFB_MODE
:
212 case EVP_CIPH_CBC_MODE
:
214 OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx
) <=
215 (int)sizeof(ctx
->iv
));
217 memcpy(ctx
->oiv
, iv
, EVP_CIPHER_CTX_iv_length(ctx
));
218 memcpy(ctx
->iv
, ctx
->oiv
, EVP_CIPHER_CTX_iv_length(ctx
));
221 case EVP_CIPH_CTR_MODE
:
223 /* Don't reuse IV for CTR mode */
225 memcpy(ctx
->iv
, iv
, EVP_CIPHER_CTX_iv_length(ctx
));
233 if (key
|| (ctx
->cipher
->flags
& EVP_CIPH_ALWAYS_CALL_INIT
)) {
234 if (!ctx
->cipher
->init(ctx
, key
, iv
, enc
))
239 ctx
->block_mask
= ctx
->cipher
->block_size
- 1;
243 int EVP_CipherUpdate(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
,
244 const unsigned char *in
, int inl
)
247 return EVP_EncryptUpdate(ctx
, out
, outl
, in
, inl
);
249 return EVP_DecryptUpdate(ctx
, out
, outl
, in
, inl
);
252 int EVP_CipherFinal_ex(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
)
255 return EVP_EncryptFinal_ex(ctx
, out
, outl
);
257 return EVP_DecryptFinal_ex(ctx
, out
, outl
);
260 int EVP_CipherFinal(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
)
263 return EVP_EncryptFinal(ctx
, out
, outl
);
265 return EVP_DecryptFinal(ctx
, out
, outl
);
268 int EVP_EncryptInit(EVP_CIPHER_CTX
*ctx
, const EVP_CIPHER
*cipher
,
269 const unsigned char *key
, const unsigned char *iv
)
271 return EVP_CipherInit(ctx
, cipher
, key
, iv
, 1);
274 int EVP_EncryptInit_ex(EVP_CIPHER_CTX
*ctx
, const EVP_CIPHER
*cipher
,
275 ENGINE
*impl
, const unsigned char *key
,
276 const unsigned char *iv
)
278 return EVP_CipherInit_ex(ctx
, cipher
, impl
, key
, iv
, 1);
281 int EVP_DecryptInit(EVP_CIPHER_CTX
*ctx
, const EVP_CIPHER
*cipher
,
282 const unsigned char *key
, const unsigned char *iv
)
284 return EVP_CipherInit(ctx
, cipher
, key
, iv
, 0);
287 int EVP_DecryptInit_ex(EVP_CIPHER_CTX
*ctx
, const EVP_CIPHER
*cipher
,
288 ENGINE
*impl
, const unsigned char *key
,
289 const unsigned char *iv
)
291 return EVP_CipherInit_ex(ctx
, cipher
, impl
, key
, iv
, 0);
294 int EVP_EncryptUpdate(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
,
295 const unsigned char *in
, int inl
)
299 if (ctx
->cipher
->flags
& EVP_CIPH_FLAG_CUSTOM_CIPHER
) {
300 i
= ctx
->cipher
->do_cipher(ctx
, out
, in
, inl
);
313 if (ctx
->buf_len
== 0 && (inl
& (ctx
->block_mask
)) == 0) {
314 if (ctx
->cipher
->do_cipher(ctx
, out
, in
, inl
)) {
323 bl
= ctx
->cipher
->block_size
;
324 OPENSSL_assert(bl
<= (int)sizeof(ctx
->buf
));
327 memcpy(&(ctx
->buf
[i
]), in
, inl
);
333 memcpy(&(ctx
->buf
[i
]), in
, j
);
334 if (!ctx
->cipher
->do_cipher(ctx
, out
, ctx
->buf
, bl
))
346 if (!ctx
->cipher
->do_cipher(ctx
, out
, in
, inl
))
352 memcpy(ctx
->buf
, &(in
[inl
]), i
);
357 int EVP_EncryptFinal(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
)
360 ret
= EVP_EncryptFinal_ex(ctx
, out
, outl
);
364 int EVP_EncryptFinal_ex(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
)
367 unsigned int i
, b
, bl
;
369 if (ctx
->cipher
->flags
& EVP_CIPH_FLAG_CUSTOM_CIPHER
) {
370 ret
= ctx
->cipher
->do_cipher(ctx
, out
, NULL
, 0);
378 b
= ctx
->cipher
->block_size
;
379 OPENSSL_assert(b
<= sizeof ctx
->buf
);
385 if (ctx
->flags
& EVP_CIPH_NO_PADDING
) {
387 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX
,
388 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH
);
396 for (i
= bl
; i
< b
; i
++)
398 ret
= ctx
->cipher
->do_cipher(ctx
, out
, ctx
->buf
, b
);
406 int EVP_DecryptUpdate(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
,
407 const unsigned char *in
, int inl
)
412 if (ctx
->cipher
->flags
& EVP_CIPH_FLAG_CUSTOM_CIPHER
) {
413 fix_len
= ctx
->cipher
->do_cipher(ctx
, out
, in
, inl
);
427 if (ctx
->flags
& EVP_CIPH_NO_PADDING
)
428 return EVP_EncryptUpdate(ctx
, out
, outl
, in
, inl
);
430 b
= ctx
->cipher
->block_size
;
431 OPENSSL_assert(b
<= sizeof ctx
->final
);
433 if (ctx
->final_used
) {
434 memcpy(out
, ctx
->final
, b
);
440 if (!EVP_EncryptUpdate(ctx
, out
, outl
, in
, inl
))
444 * if we have 'decrypted' a multiple of block size, make sure we have a
445 * copy of this last block
447 if (b
> 1 && !ctx
->buf_len
) {
450 memcpy(ctx
->final
, &out
[*outl
], b
);
460 int EVP_DecryptFinal(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
)
463 ret
= EVP_DecryptFinal_ex(ctx
, out
, outl
);
467 int EVP_DecryptFinal_ex(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
)
473 if (ctx
->cipher
->flags
& EVP_CIPH_FLAG_CUSTOM_CIPHER
) {
474 i
= ctx
->cipher
->do_cipher(ctx
, out
, NULL
, 0);
482 b
= ctx
->cipher
->block_size
;
483 if (ctx
->flags
& EVP_CIPH_NO_PADDING
) {
485 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX
,
486 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH
);
493 if (ctx
->buf_len
|| !ctx
->final_used
) {
494 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX
, EVP_R_WRONG_FINAL_BLOCK_LENGTH
);
497 OPENSSL_assert(b
<= sizeof ctx
->final
);
500 * The following assumes that the ciphertext has been authenticated.
501 * Otherwise it provides a padding oracle.
503 n
= ctx
->final
[b
- 1];
504 if (n
== 0 || n
> (int)b
) {
505 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX
, EVP_R_BAD_DECRYPT
);
508 for (i
= 0; i
< n
; i
++) {
509 if (ctx
->final
[--b
] != n
) {
510 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX
, EVP_R_BAD_DECRYPT
);
514 n
= ctx
->cipher
->block_size
- n
;
515 for (i
= 0; i
< n
; i
++)
516 out
[i
] = ctx
->final
[i
];
523 void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX
*ctx
)
525 EVP_CIPHER_CTX_cleanup(ctx
);
529 int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX
*c
)
533 if (c
->cipher
!= NULL
) {
534 if (c
->cipher
->cleanup
&& !c
->cipher
->cleanup(c
))
536 /* Cleanse cipher context data */
538 OPENSSL_cleanse(c
->cipher_data
, c
->cipher
->ctx_size
);
540 OPENSSL_free(c
->cipher_data
);
541 #ifndef OPENSSL_NO_ENGINE
544 * The EVP_CIPHER we used belongs to an ENGINE, release the
545 * functional reference we held for this reason.
547 ENGINE_finish(c
->engine
);
549 memset(c
, 0, sizeof(*c
));
553 int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX
*c
, int keylen
)
555 if (c
->cipher
->flags
& EVP_CIPH_CUSTOM_KEY_LENGTH
)
556 return EVP_CIPHER_CTX_ctrl(c
, EVP_CTRL_SET_KEY_LENGTH
, keylen
, NULL
);
557 if (c
->key_len
== keylen
)
559 if ((keylen
> 0) && (c
->cipher
->flags
& EVP_CIPH_VARIABLE_LENGTH
)) {
563 EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH
, EVP_R_INVALID_KEY_LENGTH
);
567 int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX
*ctx
, int pad
)
570 ctx
->flags
&= ~EVP_CIPH_NO_PADDING
;
572 ctx
->flags
|= EVP_CIPH_NO_PADDING
;
576 int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX
*ctx
, int type
, int arg
, void *ptr
)
580 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL
, EVP_R_NO_CIPHER_SET
);
584 if (!ctx
->cipher
->ctrl
) {
585 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL
, EVP_R_CTRL_NOT_IMPLEMENTED
);
589 ret
= ctx
->cipher
->ctrl(ctx
, type
, arg
, ptr
);
591 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL
,
592 EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED
);
598 int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX
*ctx
, unsigned char *key
)
600 if (ctx
->cipher
->flags
& EVP_CIPH_RAND_KEY
)
601 return EVP_CIPHER_CTX_ctrl(ctx
, EVP_CTRL_RAND_KEY
, 0, key
);
602 if (RAND_bytes(key
, ctx
->key_len
) <= 0)
607 int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX
*out
, const EVP_CIPHER_CTX
*in
)
609 if ((in
== NULL
) || (in
->cipher
== NULL
)) {
610 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY
, EVP_R_INPUT_NOT_INITIALIZED
);
613 #ifndef OPENSSL_NO_ENGINE
614 /* Make sure it's safe to copy a cipher context using an ENGINE */
615 if (in
->engine
&& !ENGINE_init(in
->engine
)) {
616 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY
, ERR_R_ENGINE_LIB
);
621 EVP_CIPHER_CTX_cleanup(out
);
622 memcpy(out
, in
, sizeof(*out
));
624 if (in
->cipher_data
&& in
->cipher
->ctx_size
) {
625 out
->cipher_data
= OPENSSL_malloc(in
->cipher
->ctx_size
);
626 if (!out
->cipher_data
) {
627 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY
, ERR_R_MALLOC_FAILURE
);
630 memcpy(out
->cipher_data
, in
->cipher_data
, in
->cipher
->ctx_size
);
633 if (in
->cipher
->flags
& EVP_CIPH_CUSTOM_COPY
)
634 return in
->cipher
->ctrl((EVP_CIPHER_CTX
*)in
, EVP_CTRL_COPY
, 0, out
);