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>
67 #include "internal/evp_int.h"
70 int EVP_CIPHER_CTX_reset(EVP_CIPHER_CTX
*c
)
74 if (c
->cipher
!= NULL
) {
75 if (c
->cipher
->cleanup
&& !c
->cipher
->cleanup(c
))
77 /* Cleanse cipher context data */
78 if (c
->cipher_data
&& c
->cipher
->ctx_size
)
79 OPENSSL_cleanse(c
->cipher_data
, c
->cipher
->ctx_size
);
81 OPENSSL_free(c
->cipher_data
);
82 #ifndef OPENSSL_NO_ENGINE
85 * The EVP_CIPHER we used belongs to an ENGINE, release the
86 * functional reference we held for this reason.
88 ENGINE_finish(c
->engine
);
90 memset(c
, 0, sizeof(*c
));
94 EVP_CIPHER_CTX
*EVP_CIPHER_CTX_new(void)
96 return OPENSSL_zalloc(sizeof(EVP_CIPHER_CTX
));
99 void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX
*ctx
)
101 EVP_CIPHER_CTX_reset(ctx
);
105 int EVP_CipherInit(EVP_CIPHER_CTX
*ctx
, const EVP_CIPHER
*cipher
,
106 const unsigned char *key
, const unsigned char *iv
, int enc
)
108 EVP_CIPHER_CTX_reset(ctx
);
109 return EVP_CipherInit_ex(ctx
, cipher
, NULL
, key
, iv
, enc
);
112 int EVP_CipherInit_ex(EVP_CIPHER_CTX
*ctx
, const EVP_CIPHER
*cipher
,
113 ENGINE
*impl
, const unsigned char *key
,
114 const unsigned char *iv
, int enc
)
123 #ifndef OPENSSL_NO_ENGINE
125 * Whether it's nice or not, "Inits" can be used on "Final"'d contexts so
126 * this context may already have an ENGINE! Try to avoid releasing the
127 * previous handle, re-querying for an ENGINE, and having a
128 * reinitialisation, when it may all be unecessary.
130 if (ctx
->engine
&& ctx
->cipher
131 && (!cipher
|| (cipher
&& (cipher
->nid
== ctx
->cipher
->nid
))))
136 * Ensure a context left lying around from last time is cleared (the
137 * previous check attempted to avoid this if the same ENGINE and
138 * EVP_CIPHER could be used).
141 unsigned long flags
= ctx
->flags
;
142 EVP_CIPHER_CTX_reset(ctx
);
143 /* Restore encrypt and flags */
147 #ifndef OPENSSL_NO_ENGINE
149 if (!ENGINE_init(impl
)) {
150 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, EVP_R_INITIALIZATION_ERROR
);
154 /* Ask if an ENGINE is reserved for this job */
155 impl
= ENGINE_get_cipher_engine(cipher
->nid
);
157 /* There's an ENGINE for this job ... (apparently) */
158 const EVP_CIPHER
*c
= ENGINE_get_cipher(impl
, cipher
->nid
);
161 * One positive side-effect of US's export control history,
162 * is that we should at least be able to avoid using US
163 * mispellings of "initialisation"?
165 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, EVP_R_INITIALIZATION_ERROR
);
168 /* We'll use the ENGINE's private cipher definition */
171 * Store the ENGINE functional reference so we know 'cipher' came
172 * from an ENGINE and we need to release it when done.
179 ctx
->cipher
= cipher
;
180 if (ctx
->cipher
->ctx_size
) {
181 ctx
->cipher_data
= OPENSSL_zalloc(ctx
->cipher
->ctx_size
);
182 if (ctx
->cipher_data
== NULL
) {
183 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, ERR_R_MALLOC_FAILURE
);
187 ctx
->cipher_data
= NULL
;
189 ctx
->key_len
= cipher
->key_len
;
190 /* Preserve wrap enable flag, zero everything else */
191 ctx
->flags
&= EVP_CIPHER_CTX_FLAG_WRAP_ALLOW
;
192 if (ctx
->cipher
->flags
& EVP_CIPH_CTRL_INIT
) {
193 if (!EVP_CIPHER_CTX_ctrl(ctx
, EVP_CTRL_INIT
, 0, NULL
)) {
194 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, EVP_R_INITIALIZATION_ERROR
);
198 } else if (!ctx
->cipher
) {
199 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, EVP_R_NO_CIPHER_SET
);
202 #ifndef OPENSSL_NO_ENGINE
205 /* we assume block size is a power of 2 in *cryptUpdate */
206 OPENSSL_assert(ctx
->cipher
->block_size
== 1
207 || ctx
->cipher
->block_size
== 8
208 || ctx
->cipher
->block_size
== 16);
210 if (!(ctx
->flags
& EVP_CIPHER_CTX_FLAG_WRAP_ALLOW
)
211 && EVP_CIPHER_CTX_mode(ctx
) == EVP_CIPH_WRAP_MODE
) {
212 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, EVP_R_WRAP_MODE_NOT_ALLOWED
);
216 if (!(EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(ctx
)) & EVP_CIPH_CUSTOM_IV
)) {
217 switch (EVP_CIPHER_CTX_mode(ctx
)) {
219 case EVP_CIPH_STREAM_CIPHER
:
220 case EVP_CIPH_ECB_MODE
:
223 case EVP_CIPH_CFB_MODE
:
224 case EVP_CIPH_OFB_MODE
:
229 case EVP_CIPH_CBC_MODE
:
231 OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx
) <=
232 (int)sizeof(ctx
->iv
));
234 memcpy(ctx
->oiv
, iv
, EVP_CIPHER_CTX_iv_length(ctx
));
235 memcpy(ctx
->iv
, ctx
->oiv
, EVP_CIPHER_CTX_iv_length(ctx
));
238 case EVP_CIPH_CTR_MODE
:
240 /* Don't reuse IV for CTR mode */
242 memcpy(ctx
->iv
, iv
, EVP_CIPHER_CTX_iv_length(ctx
));
250 if (key
|| (ctx
->cipher
->flags
& EVP_CIPH_ALWAYS_CALL_INIT
)) {
251 if (!ctx
->cipher
->init(ctx
, key
, iv
, enc
))
256 ctx
->block_mask
= ctx
->cipher
->block_size
- 1;
260 int EVP_CipherUpdate(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
,
261 const unsigned char *in
, int inl
)
264 return EVP_EncryptUpdate(ctx
, out
, outl
, in
, inl
);
266 return EVP_DecryptUpdate(ctx
, out
, outl
, in
, inl
);
269 int EVP_CipherFinal_ex(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
)
272 return EVP_EncryptFinal_ex(ctx
, out
, outl
);
274 return EVP_DecryptFinal_ex(ctx
, out
, outl
);
277 int EVP_CipherFinal(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
)
280 return EVP_EncryptFinal(ctx
, out
, outl
);
282 return EVP_DecryptFinal(ctx
, out
, outl
);
285 int EVP_EncryptInit(EVP_CIPHER_CTX
*ctx
, const EVP_CIPHER
*cipher
,
286 const unsigned char *key
, const unsigned char *iv
)
288 return EVP_CipherInit(ctx
, cipher
, key
, iv
, 1);
291 int EVP_EncryptInit_ex(EVP_CIPHER_CTX
*ctx
, const EVP_CIPHER
*cipher
,
292 ENGINE
*impl
, const unsigned char *key
,
293 const unsigned char *iv
)
295 return EVP_CipherInit_ex(ctx
, cipher
, impl
, key
, iv
, 1);
298 int EVP_DecryptInit(EVP_CIPHER_CTX
*ctx
, const EVP_CIPHER
*cipher
,
299 const unsigned char *key
, const unsigned char *iv
)
301 return EVP_CipherInit(ctx
, cipher
, key
, iv
, 0);
304 int EVP_DecryptInit_ex(EVP_CIPHER_CTX
*ctx
, const EVP_CIPHER
*cipher
,
305 ENGINE
*impl
, const unsigned char *key
,
306 const unsigned char *iv
)
308 return EVP_CipherInit_ex(ctx
, cipher
, impl
, key
, iv
, 0);
311 int EVP_EncryptUpdate(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
,
312 const unsigned char *in
, int inl
)
316 if (ctx
->cipher
->flags
& EVP_CIPH_FLAG_CUSTOM_CIPHER
) {
317 i
= ctx
->cipher
->do_cipher(ctx
, out
, in
, inl
);
330 if (ctx
->buf_len
== 0 && (inl
& (ctx
->block_mask
)) == 0) {
331 if (ctx
->cipher
->do_cipher(ctx
, out
, in
, inl
)) {
340 bl
= ctx
->cipher
->block_size
;
341 OPENSSL_assert(bl
<= (int)sizeof(ctx
->buf
));
344 memcpy(&(ctx
->buf
[i
]), in
, inl
);
350 memcpy(&(ctx
->buf
[i
]), in
, j
);
351 if (!ctx
->cipher
->do_cipher(ctx
, out
, ctx
->buf
, bl
))
363 if (!ctx
->cipher
->do_cipher(ctx
, out
, in
, inl
))
369 memcpy(ctx
->buf
, &(in
[inl
]), i
);
374 int EVP_EncryptFinal(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
)
377 ret
= EVP_EncryptFinal_ex(ctx
, out
, outl
);
381 int EVP_EncryptFinal_ex(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
)
384 unsigned int i
, b
, bl
;
386 if (ctx
->cipher
->flags
& EVP_CIPH_FLAG_CUSTOM_CIPHER
) {
387 ret
= ctx
->cipher
->do_cipher(ctx
, out
, NULL
, 0);
395 b
= ctx
->cipher
->block_size
;
396 OPENSSL_assert(b
<= sizeof ctx
->buf
);
402 if (ctx
->flags
& EVP_CIPH_NO_PADDING
) {
404 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX
,
405 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH
);
413 for (i
= bl
; i
< b
; i
++)
415 ret
= ctx
->cipher
->do_cipher(ctx
, out
, ctx
->buf
, b
);
423 int EVP_DecryptUpdate(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
,
424 const unsigned char *in
, int inl
)
429 if (ctx
->cipher
->flags
& EVP_CIPH_FLAG_CUSTOM_CIPHER
) {
430 fix_len
= ctx
->cipher
->do_cipher(ctx
, out
, in
, inl
);
444 if (ctx
->flags
& EVP_CIPH_NO_PADDING
)
445 return EVP_EncryptUpdate(ctx
, out
, outl
, in
, inl
);
447 b
= ctx
->cipher
->block_size
;
448 OPENSSL_assert(b
<= sizeof ctx
->final
);
450 if (ctx
->final_used
) {
451 memcpy(out
, ctx
->final
, b
);
457 if (!EVP_EncryptUpdate(ctx
, out
, outl
, in
, inl
))
461 * if we have 'decrypted' a multiple of block size, make sure we have a
462 * copy of this last block
464 if (b
> 1 && !ctx
->buf_len
) {
467 memcpy(ctx
->final
, &out
[*outl
], b
);
477 int EVP_DecryptFinal(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
)
480 ret
= EVP_DecryptFinal_ex(ctx
, out
, outl
);
484 int EVP_DecryptFinal_ex(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
)
490 if (ctx
->cipher
->flags
& EVP_CIPH_FLAG_CUSTOM_CIPHER
) {
491 i
= ctx
->cipher
->do_cipher(ctx
, out
, NULL
, 0);
499 b
= ctx
->cipher
->block_size
;
500 if (ctx
->flags
& EVP_CIPH_NO_PADDING
) {
502 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX
,
503 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH
);
510 if (ctx
->buf_len
|| !ctx
->final_used
) {
511 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX
, EVP_R_WRONG_FINAL_BLOCK_LENGTH
);
514 OPENSSL_assert(b
<= sizeof ctx
->final
);
517 * The following assumes that the ciphertext has been authenticated.
518 * Otherwise it provides a padding oracle.
520 n
= ctx
->final
[b
- 1];
521 if (n
== 0 || n
> (int)b
) {
522 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX
, EVP_R_BAD_DECRYPT
);
525 for (i
= 0; i
< n
; i
++) {
526 if (ctx
->final
[--b
] != n
) {
527 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX
, EVP_R_BAD_DECRYPT
);
531 n
= ctx
->cipher
->block_size
- n
;
532 for (i
= 0; i
< n
; i
++)
533 out
[i
] = ctx
->final
[i
];
540 int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX
*c
, int keylen
)
542 if (c
->cipher
->flags
& EVP_CIPH_CUSTOM_KEY_LENGTH
)
543 return EVP_CIPHER_CTX_ctrl(c
, EVP_CTRL_SET_KEY_LENGTH
, keylen
, NULL
);
544 if (c
->key_len
== keylen
)
546 if ((keylen
> 0) && (c
->cipher
->flags
& EVP_CIPH_VARIABLE_LENGTH
)) {
550 EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH
, EVP_R_INVALID_KEY_LENGTH
);
554 int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX
*ctx
, int pad
)
557 ctx
->flags
&= ~EVP_CIPH_NO_PADDING
;
559 ctx
->flags
|= EVP_CIPH_NO_PADDING
;
563 int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX
*ctx
, int type
, int arg
, void *ptr
)
567 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL
, EVP_R_NO_CIPHER_SET
);
571 if (!ctx
->cipher
->ctrl
) {
572 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL
, EVP_R_CTRL_NOT_IMPLEMENTED
);
576 ret
= ctx
->cipher
->ctrl(ctx
, type
, arg
, ptr
);
578 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL
,
579 EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED
);
585 int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX
*ctx
, unsigned char *key
)
587 if (ctx
->cipher
->flags
& EVP_CIPH_RAND_KEY
)
588 return EVP_CIPHER_CTX_ctrl(ctx
, EVP_CTRL_RAND_KEY
, 0, key
);
589 if (RAND_bytes(key
, ctx
->key_len
) <= 0)
594 int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX
*out
, const EVP_CIPHER_CTX
*in
)
596 if ((in
== NULL
) || (in
->cipher
== NULL
)) {
597 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY
, EVP_R_INPUT_NOT_INITIALIZED
);
600 #ifndef OPENSSL_NO_ENGINE
601 /* Make sure it's safe to copy a cipher context using an ENGINE */
602 if (in
->engine
&& !ENGINE_init(in
->engine
)) {
603 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY
, ERR_R_ENGINE_LIB
);
608 EVP_CIPHER_CTX_reset(out
);
609 memcpy(out
, in
, sizeof(*out
));
611 if (in
->cipher_data
&& in
->cipher
->ctx_size
) {
612 out
->cipher_data
= OPENSSL_malloc(in
->cipher
->ctx_size
);
613 if (out
->cipher_data
== NULL
) {
614 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY
, ERR_R_MALLOC_FAILURE
);
617 memcpy(out
->cipher_data
, in
->cipher_data
, in
->cipher
->ctx_size
);
620 if (in
->cipher
->flags
& EVP_CIPH_CUSTOM_COPY
)
621 return in
->cipher
->ctrl((EVP_CIPHER_CTX
*)in
, EVP_CTRL_COPY
, 0, out
);