2 * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
12 #include "internal/cryptlib.h"
13 #include <openssl/evp.h>
14 #include <openssl/err.h>
15 #include <openssl/rand.h>
16 #include <openssl/rand_drbg.h>
17 #include <openssl/engine.h>
18 #include <openssl/params.h>
19 #include <openssl/core_names.h>
20 #include "internal/evp_int.h"
21 #include "internal/provider.h"
24 int EVP_CIPHER_CTX_reset(EVP_CIPHER_CTX
*ctx
)
29 if (ctx
->cipher
== NULL
|| ctx
->cipher
->prov
== NULL
)
32 if (ctx
->provctx
!= NULL
) {
33 if (ctx
->cipher
->freectx
!= NULL
)
34 ctx
->cipher
->freectx(ctx
->provctx
);
37 if (ctx
->fetched_cipher
!= NULL
)
38 EVP_CIPHER_meth_free(ctx
->fetched_cipher
);
39 memset(ctx
, 0, sizeof(*ctx
));
43 /* TODO(3.0): Remove legacy code below */
46 if (ctx
->cipher
!= NULL
) {
47 if (ctx
->cipher
->cleanup
&& !ctx
->cipher
->cleanup(ctx
))
49 /* Cleanse cipher context data */
50 if (ctx
->cipher_data
&& ctx
->cipher
->ctx_size
)
51 OPENSSL_cleanse(ctx
->cipher_data
, ctx
->cipher
->ctx_size
);
53 OPENSSL_free(ctx
->cipher_data
);
54 #ifndef OPENSSL_NO_ENGINE
55 ENGINE_finish(ctx
->engine
);
57 memset(ctx
, 0, sizeof(*ctx
));
61 EVP_CIPHER_CTX
*EVP_CIPHER_CTX_new(void)
63 return OPENSSL_zalloc(sizeof(EVP_CIPHER_CTX
));
66 void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX
*ctx
)
68 EVP_CIPHER_CTX_reset(ctx
);
72 int EVP_CipherInit(EVP_CIPHER_CTX
*ctx
, const EVP_CIPHER
*cipher
,
73 const unsigned char *key
, const unsigned char *iv
, int enc
)
76 EVP_CIPHER_CTX_reset(ctx
);
77 return EVP_CipherInit_ex(ctx
, cipher
, NULL
, key
, iv
, enc
);
80 int EVP_CipherInit_ex(EVP_CIPHER_CTX
*ctx
, const EVP_CIPHER
*cipher
,
81 ENGINE
*impl
, const unsigned char *key
,
82 const unsigned char *iv
, int enc
)
84 EVP_CIPHER
*provciph
= NULL
;
85 ENGINE
*tmpimpl
= NULL
;
86 const EVP_CIPHER
*tmpcipher
;
89 * enc == 1 means we are encrypting.
90 * enc == 0 means we are decrypting.
91 * enc == -1 means, use the previously initialised value for encrypt/decrypt
101 if (cipher
== NULL
&& ctx
->cipher
== NULL
) {
102 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, EVP_R_NO_CIPHER_SET
);
106 /* TODO(3.0): Legacy work around code below. Remove this */
108 #ifndef OPENSSL_NO_ENGINE
110 * Whether it's nice or not, "Inits" can be used on "Final"'d contexts so
111 * this context may already have an ENGINE! Try to avoid releasing the
112 * previous handle, re-querying for an ENGINE, and having a
113 * reinitialisation, when it may all be unnecessary.
115 if (ctx
->engine
&& ctx
->cipher
116 && (cipher
== NULL
|| cipher
->nid
== ctx
->cipher
->nid
))
119 if (cipher
!= NULL
&& impl
== NULL
) {
120 /* Ask if an ENGINE is reserved for this job */
121 tmpimpl
= ENGINE_get_cipher_engine(cipher
->nid
);
126 * If there are engines involved then we should use legacy handling for now.
128 if (ctx
->engine
!= NULL
130 || tmpimpl
!= NULL
) {
131 if (ctx
->cipher
== ctx
->fetched_cipher
)
133 EVP_CIPHER_meth_free(ctx
->fetched_cipher
);
134 ctx
->fetched_cipher
= NULL
;
138 tmpcipher
= (cipher
== NULL
) ? ctx
->cipher
: cipher
;
140 if (tmpcipher
->prov
== NULL
) {
141 switch(tmpcipher
->nid
) {
142 case NID_aes_256_ecb
:
143 case NID_aes_192_ecb
:
144 case NID_aes_128_ecb
:
145 case NID_aes_256_cbc
:
146 case NID_aes_192_cbc
:
147 case NID_aes_128_cbc
:
148 case NID_aes_256_ofb128
:
149 case NID_aes_192_ofb128
:
150 case NID_aes_128_ofb128
:
151 case NID_aes_256_cfb128
:
152 case NID_aes_192_cfb128
:
153 case NID_aes_128_cfb128
:
154 case NID_aes_256_cfb1
:
155 case NID_aes_192_cfb1
:
156 case NID_aes_128_cfb1
:
157 case NID_aes_256_cfb8
:
158 case NID_aes_192_cfb8
:
159 case NID_aes_128_cfb8
:
160 case NID_aes_256_ctr
:
161 case NID_aes_192_ctr
:
162 case NID_aes_128_ctr
:
170 * Ensure a context left lying around from last time is cleared
173 if (cipher
!= NULL
&& ctx
->cipher
!= NULL
) {
174 OPENSSL_clear_free(ctx
->cipher_data
, ctx
->cipher
->ctx_size
);
175 ctx
->cipher_data
= NULL
;
179 /* TODO(3.0): Start of non-legacy code below */
181 /* Ensure a context left lying around from last time is cleared */
182 if (cipher
!= NULL
&& ctx
->cipher
!= NULL
) {
183 unsigned long flags
= ctx
->flags
;
185 EVP_CIPHER_CTX_reset(ctx
);
186 /* Restore encrypt and flags */
192 ctx
->cipher
= cipher
;
194 cipher
= ctx
->cipher
;
196 if (cipher
->prov
== NULL
) {
197 provciph
= EVP_CIPHER_fetch(NULL
, OBJ_nid2sn(cipher
->nid
), "");
198 if (provciph
== NULL
) {
199 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, EVP_R_INITIALIZATION_ERROR
);
203 EVP_CIPHER_meth_free(ctx
->fetched_cipher
);
204 ctx
->fetched_cipher
= provciph
;
207 ctx
->cipher
= cipher
;
208 if (ctx
->provctx
== NULL
) {
209 ctx
->provctx
= ctx
->cipher
->newctx(ossl_provider_ctx(cipher
->prov
));
210 if (ctx
->provctx
== NULL
) {
211 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, EVP_R_INITIALIZATION_ERROR
);
216 if ((ctx
->flags
& EVP_CIPH_NO_PADDING
) != 0) {
218 * If this ctx was already set up for no padding then we need to tell
219 * the new cipher about it.
221 if (!EVP_CIPHER_CTX_set_padding(ctx
, 0))
225 switch (EVP_CIPHER_mode(ctx
->cipher
)) {
226 case EVP_CIPH_CFB_MODE
:
227 case EVP_CIPH_OFB_MODE
:
228 case EVP_CIPH_CBC_MODE
:
229 /* For these modes we remember the original IV for later use */
230 if (!ossl_assert(EVP_CIPHER_CTX_iv_length(ctx
) <= (int)sizeof(ctx
->oiv
))) {
231 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, EVP_R_INITIALIZATION_ERROR
);
235 memcpy(ctx
->oiv
, iv
, EVP_CIPHER_CTX_iv_length(ctx
));
239 if (ctx
->cipher
->einit
== NULL
) {
240 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, EVP_R_INITIALIZATION_ERROR
);
244 return ctx
->cipher
->einit(ctx
->provctx
,
247 : EVP_CIPHER_CTX_key_length(ctx
),
250 : EVP_CIPHER_CTX_iv_length(ctx
));
253 if (ctx
->cipher
->dinit
== NULL
) {
254 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, EVP_R_INITIALIZATION_ERROR
);
258 return ctx
->cipher
->dinit(ctx
->provctx
,
261 : EVP_CIPHER_CTX_key_length(ctx
),
264 : EVP_CIPHER_CTX_iv_length(ctx
));
266 /* TODO(3.0): Remove legacy code below */
269 if (cipher
!= NULL
) {
271 * Ensure a context left lying around from last time is cleared (we
272 * previously attempted to avoid this if the same ENGINE and
273 * EVP_CIPHER could be used).
276 unsigned long flags
= ctx
->flags
;
277 EVP_CIPHER_CTX_reset(ctx
);
278 /* Restore encrypt and flags */
282 #ifndef OPENSSL_NO_ENGINE
284 if (!ENGINE_init(impl
)) {
285 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, EVP_R_INITIALIZATION_ERROR
);
292 /* There's an ENGINE for this job ... (apparently) */
293 const EVP_CIPHER
*c
= ENGINE_get_cipher(impl
, cipher
->nid
);
297 * One positive side-effect of US's export control history,
298 * is that we should at least be able to avoid using US
299 * misspellings of "initialisation"?
301 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, EVP_R_INITIALIZATION_ERROR
);
304 /* We'll use the ENGINE's private cipher definition */
307 * Store the ENGINE functional reference so we know 'cipher' came
308 * from an ENGINE and we need to release it when done.
316 ctx
->cipher
= cipher
;
317 if (ctx
->cipher
->ctx_size
) {
318 ctx
->cipher_data
= OPENSSL_zalloc(ctx
->cipher
->ctx_size
);
319 if (ctx
->cipher_data
== NULL
) {
321 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, ERR_R_MALLOC_FAILURE
);
325 ctx
->cipher_data
= NULL
;
327 ctx
->key_len
= cipher
->key_len
;
328 /* Preserve wrap enable flag, zero everything else */
329 ctx
->flags
&= EVP_CIPHER_CTX_FLAG_WRAP_ALLOW
;
330 if (ctx
->cipher
->flags
& EVP_CIPH_CTRL_INIT
) {
331 if (!EVP_CIPHER_CTX_ctrl(ctx
, EVP_CTRL_INIT
, 0, NULL
)) {
333 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, EVP_R_INITIALIZATION_ERROR
);
338 #ifndef OPENSSL_NO_ENGINE
341 /* we assume block size is a power of 2 in *cryptUpdate */
342 OPENSSL_assert(ctx
->cipher
->block_size
== 1
343 || ctx
->cipher
->block_size
== 8
344 || ctx
->cipher
->block_size
== 16);
346 if (!(ctx
->flags
& EVP_CIPHER_CTX_FLAG_WRAP_ALLOW
)
347 && EVP_CIPHER_CTX_mode(ctx
) == EVP_CIPH_WRAP_MODE
) {
348 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, EVP_R_WRAP_MODE_NOT_ALLOWED
);
352 if (!(EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(ctx
)) & EVP_CIPH_CUSTOM_IV
)) {
353 switch (EVP_CIPHER_CTX_mode(ctx
)) {
355 case EVP_CIPH_STREAM_CIPHER
:
356 case EVP_CIPH_ECB_MODE
:
359 case EVP_CIPH_CFB_MODE
:
360 case EVP_CIPH_OFB_MODE
:
365 case EVP_CIPH_CBC_MODE
:
367 OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx
) <=
368 (int)sizeof(ctx
->iv
));
370 memcpy(ctx
->oiv
, iv
, EVP_CIPHER_CTX_iv_length(ctx
));
371 memcpy(ctx
->iv
, ctx
->oiv
, EVP_CIPHER_CTX_iv_length(ctx
));
374 case EVP_CIPH_CTR_MODE
:
376 /* Don't reuse IV for CTR mode */
378 memcpy(ctx
->iv
, iv
, EVP_CIPHER_CTX_iv_length(ctx
));
386 if (key
|| (ctx
->cipher
->flags
& EVP_CIPH_ALWAYS_CALL_INIT
)) {
387 if (!ctx
->cipher
->init(ctx
, key
, iv
, enc
))
392 ctx
->block_mask
= ctx
->cipher
->block_size
- 1;
396 int EVP_CipherUpdate(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
,
397 const unsigned char *in
, int inl
)
400 return EVP_EncryptUpdate(ctx
, out
, outl
, in
, inl
);
402 return EVP_DecryptUpdate(ctx
, out
, outl
, in
, inl
);
405 int EVP_CipherFinal_ex(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
)
408 return EVP_EncryptFinal_ex(ctx
, out
, outl
);
410 return EVP_DecryptFinal_ex(ctx
, out
, outl
);
413 int EVP_CipherFinal(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
)
416 return EVP_EncryptFinal(ctx
, out
, outl
);
418 return EVP_DecryptFinal(ctx
, out
, outl
);
421 int EVP_EncryptInit(EVP_CIPHER_CTX
*ctx
, const EVP_CIPHER
*cipher
,
422 const unsigned char *key
, const unsigned char *iv
)
424 return EVP_CipherInit(ctx
, cipher
, key
, iv
, 1);
427 int EVP_EncryptInit_ex(EVP_CIPHER_CTX
*ctx
, const EVP_CIPHER
*cipher
,
428 ENGINE
*impl
, const unsigned char *key
,
429 const unsigned char *iv
)
431 return EVP_CipherInit_ex(ctx
, cipher
, impl
, key
, iv
, 1);
434 int EVP_DecryptInit(EVP_CIPHER_CTX
*ctx
, const EVP_CIPHER
*cipher
,
435 const unsigned char *key
, const unsigned char *iv
)
437 return EVP_CipherInit(ctx
, cipher
, key
, iv
, 0);
440 int EVP_DecryptInit_ex(EVP_CIPHER_CTX
*ctx
, const EVP_CIPHER
*cipher
,
441 ENGINE
*impl
, const unsigned char *key
,
442 const unsigned char *iv
)
444 return EVP_CipherInit_ex(ctx
, cipher
, impl
, key
, iv
, 0);
448 * According to the letter of standard difference between pointers
449 * is specified to be valid only within same object. This makes
450 * it formally challenging to determine if input and output buffers
451 * are not partially overlapping with standard pointer arithmetic.
456 #if defined(OPENSSL_SYS_VMS) && __INITIAL_POINTER_SIZE==64
458 * Then we have VMS that distinguishes itself by adhering to
459 * sizeof(size_t)==4 even in 64-bit builds, which means that
460 * difference between two pointers might be truncated to 32 bits.
461 * In the context one can even wonder how comparison for
462 * equality is implemented. To be on the safe side we adhere to
463 * PTRDIFF_T even for comparison for equality.
465 # define PTRDIFF_T uint64_t
467 # define PTRDIFF_T size_t
470 int is_partially_overlapping(const void *ptr1
, const void *ptr2
, int len
)
472 PTRDIFF_T diff
= (PTRDIFF_T
)ptr1
-(PTRDIFF_T
)ptr2
;
474 * Check for partially overlapping buffers. [Binary logical
475 * operations are used instead of boolean to minimize number
476 * of conditional branches.]
478 int overlapped
= (len
> 0) & (diff
!= 0) & ((diff
< (PTRDIFF_T
)len
) |
479 (diff
> (0 - (PTRDIFF_T
)len
)));
484 static int evp_EncryptDecryptUpdate(EVP_CIPHER_CTX
*ctx
,
485 unsigned char *out
, int *outl
,
486 const unsigned char *in
, int inl
)
488 int i
, j
, bl
, cmpl
= inl
;
490 if (EVP_CIPHER_CTX_test_flags(ctx
, EVP_CIPH_FLAG_LENGTH_BITS
))
491 cmpl
= (cmpl
+ 7) / 8;
493 bl
= ctx
->cipher
->block_size
;
500 if (ctx
->cipher
->flags
& EVP_CIPH_FLAG_CUSTOM_CIPHER
) {
501 /* If block size > 1 then the cipher will have to do this check */
502 if (bl
== 1 && is_partially_overlapping(out
, in
, cmpl
)) {
503 EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE
, EVP_R_PARTIALLY_OVERLAPPING
);
507 i
= ctx
->cipher
->do_cipher(ctx
, out
, in
, inl
);
515 if (is_partially_overlapping(out
+ ctx
->buf_len
, in
, cmpl
)) {
516 EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE
, EVP_R_PARTIALLY_OVERLAPPING
);
520 if (ctx
->buf_len
== 0 && (inl
& (ctx
->block_mask
)) == 0) {
521 if (ctx
->cipher
->do_cipher(ctx
, out
, in
, inl
)) {
530 OPENSSL_assert(bl
<= (int)sizeof(ctx
->buf
));
533 memcpy(&(ctx
->buf
[i
]), in
, inl
);
539 memcpy(&(ctx
->buf
[i
]), in
, j
);
542 if (!ctx
->cipher
->do_cipher(ctx
, out
, ctx
->buf
, bl
))
552 if (!ctx
->cipher
->do_cipher(ctx
, out
, in
, inl
))
558 memcpy(ctx
->buf
, &(in
[inl
]), i
);
564 int EVP_EncryptUpdate(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
,
565 const unsigned char *in
, int inl
)
571 /* Prevent accidental use of decryption context when encrypting */
573 EVPerr(EVP_F_EVP_ENCRYPTUPDATE
, EVP_R_INVALID_OPERATION
);
577 if (ctx
->cipher
== NULL
|| ctx
->cipher
->prov
== NULL
)
580 blocksize
= EVP_CIPHER_CTX_block_size(ctx
);
582 if (ctx
->cipher
->cupdate
== NULL
|| blocksize
< 1) {
583 EVPerr(EVP_F_EVP_ENCRYPTUPDATE
, EVP_R_UPDATE_ERROR
);
586 ret
= ctx
->cipher
->cupdate(ctx
->provctx
, out
, &soutl
,
587 inl
+ (blocksize
== 1 ? 0 : blocksize
), in
,
590 if (soutl
> INT_MAX
) {
591 EVPerr(EVP_F_EVP_ENCRYPTUPDATE
, EVP_R_UPDATE_ERROR
);
597 /* TODO(3.0): Remove legacy code below */
600 return evp_EncryptDecryptUpdate(ctx
, out
, outl
, in
, inl
);
603 int EVP_EncryptFinal(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
)
606 ret
= EVP_EncryptFinal_ex(ctx
, out
, outl
);
610 int EVP_EncryptFinal_ex(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
)
613 unsigned int i
, b
, bl
;
617 /* Prevent accidental use of decryption context when encrypting */
619 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX
, EVP_R_INVALID_OPERATION
);
623 if (ctx
->cipher
== NULL
) {
624 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX
, EVP_R_NO_CIPHER_SET
);
627 if (ctx
->cipher
->prov
== NULL
)
630 blocksize
= EVP_CIPHER_CTX_block_size(ctx
);
632 if (blocksize
< 1 || ctx
->cipher
->cfinal
== NULL
) {
633 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX
, EVP_R_FINAL_ERROR
);
637 ret
= ctx
->cipher
->cfinal(ctx
->provctx
, out
, &soutl
,
638 blocksize
== 1 ? 0 : blocksize
);
640 if (soutl
> INT_MAX
) {
641 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX
, EVP_R_FINAL_ERROR
);
648 /* TODO(3.0): Remove legacy code below */
651 if (ctx
->cipher
->flags
& EVP_CIPH_FLAG_CUSTOM_CIPHER
) {
652 ret
= ctx
->cipher
->do_cipher(ctx
, out
, NULL
, 0);
660 b
= ctx
->cipher
->block_size
;
661 OPENSSL_assert(b
<= sizeof(ctx
->buf
));
667 if (ctx
->flags
& EVP_CIPH_NO_PADDING
) {
669 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX
,
670 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH
);
678 for (i
= bl
; i
< b
; i
++)
680 ret
= ctx
->cipher
->do_cipher(ctx
, out
, ctx
->buf
, b
);
688 int EVP_DecryptUpdate(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
,
689 const unsigned char *in
, int inl
)
691 int fix_len
, cmpl
= inl
, ret
;
696 /* Prevent accidental use of encryption context when decrypting */
698 EVPerr(EVP_F_EVP_DECRYPTUPDATE
, EVP_R_INVALID_OPERATION
);
702 if (ctx
->cipher
== NULL
|| ctx
->cipher
->prov
== NULL
)
705 blocksize
= EVP_CIPHER_CTX_block_size(ctx
);
707 if (ctx
->cipher
->cupdate
== NULL
|| blocksize
< 1) {
708 EVPerr(EVP_F_EVP_DECRYPTUPDATE
, EVP_R_UPDATE_ERROR
);
711 ret
= ctx
->cipher
->cupdate(ctx
->provctx
, out
, &soutl
,
712 inl
+ (blocksize
== 1 ? 0 : blocksize
), in
,
716 if (soutl
> INT_MAX
) {
717 EVPerr(EVP_F_EVP_DECRYPTUPDATE
, EVP_R_UPDATE_ERROR
);
725 /* TODO(3.0): Remove legacy code below */
728 b
= ctx
->cipher
->block_size
;
730 if (EVP_CIPHER_CTX_test_flags(ctx
, EVP_CIPH_FLAG_LENGTH_BITS
))
731 cmpl
= (cmpl
+ 7) / 8;
738 if (ctx
->cipher
->flags
& EVP_CIPH_FLAG_CUSTOM_CIPHER
) {
739 if (b
== 1 && is_partially_overlapping(out
, in
, cmpl
)) {
740 EVPerr(EVP_F_EVP_DECRYPTUPDATE
, EVP_R_PARTIALLY_OVERLAPPING
);
744 fix_len
= ctx
->cipher
->do_cipher(ctx
, out
, in
, inl
);
753 if (ctx
->flags
& EVP_CIPH_NO_PADDING
)
754 return evp_EncryptDecryptUpdate(ctx
, out
, outl
, in
, inl
);
756 OPENSSL_assert(b
<= sizeof(ctx
->final
));
758 if (ctx
->final_used
) {
759 /* see comment about PTRDIFF_T comparison above */
760 if (((PTRDIFF_T
)out
== (PTRDIFF_T
)in
)
761 || is_partially_overlapping(out
, in
, b
)) {
762 EVPerr(EVP_F_EVP_DECRYPTUPDATE
, EVP_R_PARTIALLY_OVERLAPPING
);
765 memcpy(out
, ctx
->final
, b
);
771 if (!evp_EncryptDecryptUpdate(ctx
, out
, outl
, in
, inl
))
775 * if we have 'decrypted' a multiple of block size, make sure we have a
776 * copy of this last block
778 if (b
> 1 && !ctx
->buf_len
) {
781 memcpy(ctx
->final
, &out
[*outl
], b
);
791 int EVP_DecryptFinal(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
)
794 ret
= EVP_DecryptFinal_ex(ctx
, out
, outl
);
798 int EVP_DecryptFinal_ex(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
)
806 /* Prevent accidental use of encryption context when decrypting */
808 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX
, EVP_R_INVALID_OPERATION
);
812 if (ctx
->cipher
== NULL
|| ctx
->cipher
->prov
== NULL
)
815 blocksize
= EVP_CIPHER_CTX_block_size(ctx
);
817 if (blocksize
< 1 || ctx
->cipher
->cfinal
== NULL
) {
818 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX
, EVP_R_FINAL_ERROR
);
822 ret
= ctx
->cipher
->cfinal(ctx
->provctx
, out
, &soutl
,
823 blocksize
== 1 ? 0 : blocksize
);
826 if (soutl
> INT_MAX
) {
827 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX
, EVP_R_FINAL_ERROR
);
835 /* TODO(3.0): Remove legacy code below */
840 if (ctx
->cipher
->flags
& EVP_CIPH_FLAG_CUSTOM_CIPHER
) {
841 i
= ctx
->cipher
->do_cipher(ctx
, out
, NULL
, 0);
849 b
= ctx
->cipher
->block_size
;
850 if (ctx
->flags
& EVP_CIPH_NO_PADDING
) {
852 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX
,
853 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH
);
860 if (ctx
->buf_len
|| !ctx
->final_used
) {
861 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX
, EVP_R_WRONG_FINAL_BLOCK_LENGTH
);
864 OPENSSL_assert(b
<= sizeof(ctx
->final
));
867 * The following assumes that the ciphertext has been authenticated.
868 * Otherwise it provides a padding oracle.
870 n
= ctx
->final
[b
- 1];
871 if (n
== 0 || n
> (int)b
) {
872 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX
, EVP_R_BAD_DECRYPT
);
875 for (i
= 0; i
< n
; i
++) {
876 if (ctx
->final
[--b
] != n
) {
877 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX
, EVP_R_BAD_DECRYPT
);
881 n
= ctx
->cipher
->block_size
- n
;
882 for (i
= 0; i
< n
; i
++)
883 out
[i
] = ctx
->final
[i
];
890 int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX
*c
, int keylen
)
892 if (c
->cipher
->flags
& EVP_CIPH_CUSTOM_KEY_LENGTH
)
893 return EVP_CIPHER_CTX_ctrl(c
, EVP_CTRL_SET_KEY_LENGTH
, keylen
, NULL
);
894 if (EVP_CIPHER_CTX_key_length(c
) == keylen
)
896 if ((keylen
> 0) && (c
->cipher
->flags
& EVP_CIPH_VARIABLE_LENGTH
)) {
900 EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH
, EVP_R_INVALID_KEY_LENGTH
);
904 int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX
*ctx
, int pad
)
907 ctx
->flags
&= ~EVP_CIPH_NO_PADDING
;
909 ctx
->flags
|= EVP_CIPH_NO_PADDING
;
911 if (ctx
->cipher
!= NULL
&& ctx
->cipher
->prov
!= NULL
) {
912 OSSL_PARAM params
[] = {
913 OSSL_PARAM_int(OSSL_CIPHER_PARAM_PADDING
, NULL
),
917 params
[0].data
= &pad
;
919 if (ctx
->cipher
->ctx_set_params
== NULL
) {
920 EVPerr(EVP_F_EVP_CIPHER_CTX_SET_PADDING
, EVP_R_CTRL_NOT_IMPLEMENTED
);
924 if (!ctx
->cipher
->ctx_set_params(ctx
->provctx
, params
))
931 int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX
*ctx
, int type
, int arg
, void *ptr
)
936 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL
, EVP_R_NO_CIPHER_SET
);
940 if (!ctx
->cipher
->ctrl
) {
941 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL
, EVP_R_CTRL_NOT_IMPLEMENTED
);
945 ret
= ctx
->cipher
->ctrl(ctx
, type
, arg
, ptr
);
947 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL
,
948 EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED
);
954 int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX
*ctx
, unsigned char *key
)
956 if (ctx
->cipher
->flags
& EVP_CIPH_RAND_KEY
)
957 return EVP_CIPHER_CTX_ctrl(ctx
, EVP_CTRL_RAND_KEY
, 0, key
);
958 if (RAND_priv_bytes(key
, EVP_CIPHER_CTX_key_length(ctx
)) <= 0)
963 int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX
*out
, const EVP_CIPHER_CTX
*in
)
965 if ((in
== NULL
) || (in
->cipher
== NULL
)) {
966 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY
, EVP_R_INPUT_NOT_INITIALIZED
);
970 if (in
->cipher
->prov
== NULL
)
973 if (in
->cipher
->dupctx
== NULL
) {
974 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY
, EVP_R_NOT_ABLE_TO_COPY_CTX
);
978 EVP_CIPHER_CTX_reset(out
);
983 if (in
->fetched_cipher
!= NULL
&& !EVP_CIPHER_upref(in
->fetched_cipher
)) {
984 out
->fetched_cipher
= NULL
;
988 out
->provctx
= in
->cipher
->dupctx(in
->provctx
);
989 if (out
->provctx
== NULL
) {
990 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY
, EVP_R_NOT_ABLE_TO_COPY_CTX
);
996 /* TODO(3.0): Remove legacy code below */
999 #ifndef OPENSSL_NO_ENGINE
1000 /* Make sure it's safe to copy a cipher context using an ENGINE */
1001 if (in
->engine
&& !ENGINE_init(in
->engine
)) {
1002 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY
, ERR_R_ENGINE_LIB
);
1007 EVP_CIPHER_CTX_reset(out
);
1008 memcpy(out
, in
, sizeof(*out
));
1010 if (in
->cipher_data
&& in
->cipher
->ctx_size
) {
1011 out
->cipher_data
= OPENSSL_malloc(in
->cipher
->ctx_size
);
1012 if (out
->cipher_data
== NULL
) {
1014 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY
, ERR_R_MALLOC_FAILURE
);
1017 memcpy(out
->cipher_data
, in
->cipher_data
, in
->cipher
->ctx_size
);
1020 if (in
->cipher
->flags
& EVP_CIPH_CUSTOM_COPY
)
1021 if (!in
->cipher
->ctrl((EVP_CIPHER_CTX
*)in
, EVP_CTRL_COPY
, 0, out
)) {
1023 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY
, EVP_R_INITIALIZATION_ERROR
);
1029 static void *evp_cipher_from_dispatch(int nid
, const OSSL_DISPATCH
*fns
,
1030 OSSL_PROVIDER
*prov
)
1032 EVP_CIPHER
*cipher
= NULL
;
1033 int fnciphcnt
= 0, fnctxcnt
= 0;
1035 if ((cipher
= EVP_CIPHER_meth_new(nid
, 0, 0)) == NULL
)
1038 for (; fns
->function_id
!= 0; fns
++) {
1039 switch (fns
->function_id
) {
1040 case OSSL_FUNC_CIPHER_NEWCTX
:
1041 if (cipher
->newctx
!= NULL
)
1043 cipher
->newctx
= OSSL_get_OP_cipher_newctx(fns
);
1046 case OSSL_FUNC_CIPHER_ENCRYPT_INIT
:
1047 if (cipher
->einit
!= NULL
)
1049 cipher
->einit
= OSSL_get_OP_cipher_encrypt_init(fns
);
1052 case OSSL_FUNC_CIPHER_DECRYPT_INIT
:
1053 if (cipher
->dinit
!= NULL
)
1055 cipher
->dinit
= OSSL_get_OP_cipher_decrypt_init(fns
);
1058 case OSSL_FUNC_CIPHER_UPDATE
:
1059 if (cipher
->cupdate
!= NULL
)
1061 cipher
->cupdate
= OSSL_get_OP_cipher_update(fns
);
1064 case OSSL_FUNC_CIPHER_FINAL
:
1065 if (cipher
->cfinal
!= NULL
)
1067 cipher
->cfinal
= OSSL_get_OP_cipher_final(fns
);
1070 case OSSL_FUNC_CIPHER_CIPHER
:
1071 if (cipher
->ccipher
!= NULL
)
1073 cipher
->ccipher
= OSSL_get_OP_cipher_cipher(fns
);
1075 case OSSL_FUNC_CIPHER_FREECTX
:
1076 if (cipher
->freectx
!= NULL
)
1078 cipher
->freectx
= OSSL_get_OP_cipher_freectx(fns
);
1081 case OSSL_FUNC_CIPHER_DUPCTX
:
1082 if (cipher
->dupctx
!= NULL
)
1084 cipher
->dupctx
= OSSL_get_OP_cipher_dupctx(fns
);
1086 case OSSL_FUNC_CIPHER_KEY_LENGTH
:
1087 if (cipher
->key_length
!= NULL
)
1089 cipher
->key_length
= OSSL_get_OP_cipher_key_length(fns
);
1091 case OSSL_FUNC_CIPHER_IV_LENGTH
:
1092 if (cipher
->iv_length
!= NULL
)
1094 cipher
->iv_length
= OSSL_get_OP_cipher_iv_length(fns
);
1096 case OSSL_FUNC_CIPHER_BLOCK_SIZE
:
1097 if (cipher
->blocksize
!= NULL
)
1099 cipher
->blocksize
= OSSL_get_OP_cipher_block_size(fns
);
1101 case OSSL_FUNC_CIPHER_GET_PARAMS
:
1102 if (cipher
->get_params
!= NULL
)
1104 cipher
->get_params
= OSSL_get_OP_cipher_get_params(fns
);
1106 case OSSL_FUNC_CIPHER_CTX_GET_PARAMS
:
1107 if (cipher
->ctx_get_params
!= NULL
)
1109 cipher
->ctx_get_params
= OSSL_get_OP_cipher_ctx_get_params(fns
);
1111 case OSSL_FUNC_CIPHER_CTX_SET_PARAMS
:
1112 if (cipher
->ctx_set_params
!= NULL
)
1114 cipher
->ctx_set_params
= OSSL_get_OP_cipher_ctx_set_params(fns
);
1118 if ((fnciphcnt
!= 0 && fnciphcnt
!= 3 && fnciphcnt
!= 4)
1119 || (fnciphcnt
== 0 && cipher
->ccipher
== NULL
)
1121 || cipher
->blocksize
== NULL
1122 || cipher
->iv_length
== NULL
1123 || cipher
->key_length
== NULL
) {
1125 * In order to be a consistent set of functions we must have at least
1126 * a complete set of "encrypt" functions, or a complete set of "decrypt"
1127 * functions, or a single "cipher" function. In all cases we need a
1128 * complete set of context management functions, as well as the
1129 * blocksize, iv_length and key_length functions.
1131 EVP_CIPHER_meth_free(cipher
);
1132 EVPerr(EVP_F_EVP_CIPHER_FROM_DISPATCH
, EVP_R_INVALID_PROVIDER_FUNCTIONS
);
1135 cipher
->prov
= prov
;
1137 ossl_provider_upref(prov
);
1142 static int evp_cipher_upref(void *cipher
)
1144 return EVP_CIPHER_upref(cipher
);
1147 static void evp_cipher_free(void *cipher
)
1149 EVP_CIPHER_meth_free(cipher
);
1152 static int evp_cipher_nid(void *vcipher
)
1154 EVP_CIPHER
*cipher
= vcipher
;
1159 EVP_CIPHER
*EVP_CIPHER_fetch(OPENSSL_CTX
*ctx
, const char *algorithm
,
1160 const char *properties
)
1162 return evp_generic_fetch(ctx
, OSSL_OP_CIPHER
, algorithm
, properties
,
1163 evp_cipher_from_dispatch
, evp_cipher_upref
,
1164 evp_cipher_free
, evp_cipher_nid
);