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
:
152 * Ensure a context left lying around from last time is cleared
155 if (cipher
!= NULL
&& ctx
->cipher
!= NULL
) {
156 OPENSSL_clear_free(ctx
->cipher_data
, ctx
->cipher
->ctx_size
);
157 ctx
->cipher_data
= NULL
;
161 /* TODO(3.0): Start of non-legacy code below */
163 /* Ensure a context left lying around from last time is cleared */
164 if (cipher
!= NULL
&& ctx
->cipher
!= NULL
) {
165 unsigned long flags
= ctx
->flags
;
167 EVP_CIPHER_CTX_reset(ctx
);
168 /* Restore encrypt and flags */
174 ctx
->cipher
= cipher
;
176 cipher
= ctx
->cipher
;
178 if (cipher
->prov
== NULL
) {
179 provciph
= EVP_CIPHER_fetch(NULL
, OBJ_nid2sn(cipher
->nid
), "");
180 if (provciph
== NULL
) {
181 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, EVP_R_INITIALIZATION_ERROR
);
185 EVP_CIPHER_meth_free(ctx
->fetched_cipher
);
186 ctx
->fetched_cipher
= provciph
;
189 ctx
->cipher
= cipher
;
190 if (ctx
->provctx
== NULL
) {
191 ctx
->provctx
= ctx
->cipher
->newctx();
192 if (ctx
->provctx
== NULL
) {
193 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, EVP_R_INITIALIZATION_ERROR
);
198 if ((ctx
->flags
& EVP_CIPH_NO_PADDING
) != 0) {
200 * If this ctx was already set up for no padding then we need to tell
201 * the new cipher about it.
203 if (!EVP_CIPHER_CTX_set_padding(ctx
, 0))
208 if (ctx
->cipher
->einit
== NULL
) {
209 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, EVP_R_INITIALIZATION_ERROR
);
213 return ctx
->cipher
->einit(ctx
->provctx
, key
, iv
);
216 if (ctx
->cipher
->dinit
== NULL
) {
217 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, EVP_R_INITIALIZATION_ERROR
);
221 return ctx
->cipher
->dinit(ctx
->provctx
, key
, iv
);
223 /* TODO(3.0): Remove legacy code below */
226 if (cipher
!= NULL
) {
228 * Ensure a context left lying around from last time is cleared (we
229 * previously attempted to avoid this if the same ENGINE and
230 * EVP_CIPHER could be used).
233 unsigned long flags
= ctx
->flags
;
234 EVP_CIPHER_CTX_reset(ctx
);
235 /* Restore encrypt and flags */
239 #ifndef OPENSSL_NO_ENGINE
241 if (!ENGINE_init(impl
)) {
242 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, EVP_R_INITIALIZATION_ERROR
);
249 /* There's an ENGINE for this job ... (apparently) */
250 const EVP_CIPHER
*c
= ENGINE_get_cipher(impl
, cipher
->nid
);
254 * One positive side-effect of US's export control history,
255 * is that we should at least be able to avoid using US
256 * misspellings of "initialisation"?
258 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, EVP_R_INITIALIZATION_ERROR
);
261 /* We'll use the ENGINE's private cipher definition */
264 * Store the ENGINE functional reference so we know 'cipher' came
265 * from an ENGINE and we need to release it when done.
273 ctx
->cipher
= cipher
;
274 if (ctx
->cipher
->ctx_size
) {
275 ctx
->cipher_data
= OPENSSL_zalloc(ctx
->cipher
->ctx_size
);
276 if (ctx
->cipher_data
== NULL
) {
278 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, ERR_R_MALLOC_FAILURE
);
282 ctx
->cipher_data
= NULL
;
284 ctx
->key_len
= cipher
->key_len
;
285 /* Preserve wrap enable flag, zero everything else */
286 ctx
->flags
&= EVP_CIPHER_CTX_FLAG_WRAP_ALLOW
;
287 if (ctx
->cipher
->flags
& EVP_CIPH_CTRL_INIT
) {
288 if (!EVP_CIPHER_CTX_ctrl(ctx
, EVP_CTRL_INIT
, 0, NULL
)) {
290 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, EVP_R_INITIALIZATION_ERROR
);
295 #ifndef OPENSSL_NO_ENGINE
298 /* we assume block size is a power of 2 in *cryptUpdate */
299 OPENSSL_assert(ctx
->cipher
->block_size
== 1
300 || ctx
->cipher
->block_size
== 8
301 || ctx
->cipher
->block_size
== 16);
303 if (!(ctx
->flags
& EVP_CIPHER_CTX_FLAG_WRAP_ALLOW
)
304 && EVP_CIPHER_CTX_mode(ctx
) == EVP_CIPH_WRAP_MODE
) {
305 EVPerr(EVP_F_EVP_CIPHERINIT_EX
, EVP_R_WRAP_MODE_NOT_ALLOWED
);
309 if (!(EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(ctx
)) & EVP_CIPH_CUSTOM_IV
)) {
310 switch (EVP_CIPHER_CTX_mode(ctx
)) {
312 case EVP_CIPH_STREAM_CIPHER
:
313 case EVP_CIPH_ECB_MODE
:
316 case EVP_CIPH_CFB_MODE
:
317 case EVP_CIPH_OFB_MODE
:
322 case EVP_CIPH_CBC_MODE
:
324 OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx
) <=
325 (int)sizeof(ctx
->iv
));
327 memcpy(ctx
->oiv
, iv
, EVP_CIPHER_CTX_iv_length(ctx
));
328 memcpy(ctx
->iv
, ctx
->oiv
, EVP_CIPHER_CTX_iv_length(ctx
));
331 case EVP_CIPH_CTR_MODE
:
333 /* Don't reuse IV for CTR mode */
335 memcpy(ctx
->iv
, iv
, EVP_CIPHER_CTX_iv_length(ctx
));
343 if (key
|| (ctx
->cipher
->flags
& EVP_CIPH_ALWAYS_CALL_INIT
)) {
344 if (!ctx
->cipher
->init(ctx
, key
, iv
, enc
))
349 ctx
->block_mask
= ctx
->cipher
->block_size
- 1;
353 int EVP_CipherUpdate(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
,
354 const unsigned char *in
, int inl
)
357 return EVP_EncryptUpdate(ctx
, out
, outl
, in
, inl
);
359 return EVP_DecryptUpdate(ctx
, out
, outl
, in
, inl
);
362 int EVP_CipherFinal_ex(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
)
365 return EVP_EncryptFinal_ex(ctx
, out
, outl
);
367 return EVP_DecryptFinal_ex(ctx
, out
, outl
);
370 int EVP_CipherFinal(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
)
373 return EVP_EncryptFinal(ctx
, out
, outl
);
375 return EVP_DecryptFinal(ctx
, out
, outl
);
378 int EVP_EncryptInit(EVP_CIPHER_CTX
*ctx
, const EVP_CIPHER
*cipher
,
379 const unsigned char *key
, const unsigned char *iv
)
381 return EVP_CipherInit(ctx
, cipher
, key
, iv
, 1);
384 int EVP_EncryptInit_ex(EVP_CIPHER_CTX
*ctx
, const EVP_CIPHER
*cipher
,
385 ENGINE
*impl
, const unsigned char *key
,
386 const unsigned char *iv
)
388 return EVP_CipherInit_ex(ctx
, cipher
, impl
, key
, iv
, 1);
391 int EVP_DecryptInit(EVP_CIPHER_CTX
*ctx
, const EVP_CIPHER
*cipher
,
392 const unsigned char *key
, const unsigned char *iv
)
394 return EVP_CipherInit(ctx
, cipher
, key
, iv
, 0);
397 int EVP_DecryptInit_ex(EVP_CIPHER_CTX
*ctx
, const EVP_CIPHER
*cipher
,
398 ENGINE
*impl
, const unsigned char *key
,
399 const unsigned char *iv
)
401 return EVP_CipherInit_ex(ctx
, cipher
, impl
, key
, iv
, 0);
405 * According to the letter of standard difference between pointers
406 * is specified to be valid only within same object. This makes
407 * it formally challenging to determine if input and output buffers
408 * are not partially overlapping with standard pointer arithmetic.
413 #if defined(OPENSSL_SYS_VMS) && __INITIAL_POINTER_SIZE==64
415 * Then we have VMS that distinguishes itself by adhering to
416 * sizeof(size_t)==4 even in 64-bit builds, which means that
417 * difference between two pointers might be truncated to 32 bits.
418 * In the context one can even wonder how comparison for
419 * equality is implemented. To be on the safe side we adhere to
420 * PTRDIFF_T even for comparison for equality.
422 # define PTRDIFF_T uint64_t
424 # define PTRDIFF_T size_t
427 int is_partially_overlapping(const void *ptr1
, const void *ptr2
, int len
)
429 PTRDIFF_T diff
= (PTRDIFF_T
)ptr1
-(PTRDIFF_T
)ptr2
;
431 * Check for partially overlapping buffers. [Binary logical
432 * operations are used instead of boolean to minimize number
433 * of conditional branches.]
435 int overlapped
= (len
> 0) & (diff
!= 0) & ((diff
< (PTRDIFF_T
)len
) |
436 (diff
> (0 - (PTRDIFF_T
)len
)));
441 static int evp_EncryptDecryptUpdate(EVP_CIPHER_CTX
*ctx
,
442 unsigned char *out
, int *outl
,
443 const unsigned char *in
, int inl
)
445 int i
, j
, bl
, cmpl
= inl
;
447 if (EVP_CIPHER_CTX_test_flags(ctx
, EVP_CIPH_FLAG_LENGTH_BITS
))
448 cmpl
= (cmpl
+ 7) / 8;
450 bl
= ctx
->cipher
->block_size
;
457 if (ctx
->cipher
->flags
& EVP_CIPH_FLAG_CUSTOM_CIPHER
) {
458 /* If block size > 1 then the cipher will have to do this check */
459 if (bl
== 1 && is_partially_overlapping(out
, in
, cmpl
)) {
460 EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE
, EVP_R_PARTIALLY_OVERLAPPING
);
464 i
= ctx
->cipher
->do_cipher(ctx
, out
, in
, inl
);
472 if (is_partially_overlapping(out
+ ctx
->buf_len
, in
, cmpl
)) {
473 EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE
, EVP_R_PARTIALLY_OVERLAPPING
);
477 if (ctx
->buf_len
== 0 && (inl
& (ctx
->block_mask
)) == 0) {
478 if (ctx
->cipher
->do_cipher(ctx
, out
, in
, inl
)) {
487 OPENSSL_assert(bl
<= (int)sizeof(ctx
->buf
));
490 memcpy(&(ctx
->buf
[i
]), in
, inl
);
496 memcpy(&(ctx
->buf
[i
]), in
, j
);
499 if (!ctx
->cipher
->do_cipher(ctx
, out
, ctx
->buf
, bl
))
509 if (!ctx
->cipher
->do_cipher(ctx
, out
, in
, inl
))
515 memcpy(ctx
->buf
, &(in
[inl
]), i
);
521 int EVP_EncryptUpdate(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
,
522 const unsigned char *in
, int inl
)
527 /* Prevent accidental use of decryption context when encrypting */
529 EVPerr(EVP_F_EVP_ENCRYPTUPDATE
, EVP_R_INVALID_OPERATION
);
533 if (ctx
->cipher
== NULL
|| ctx
->cipher
->prov
== NULL
)
536 if (ctx
->cipher
->cupdate
== NULL
) {
537 EVPerr(EVP_F_EVP_ENCRYPTUPDATE
, EVP_R_UPDATE_ERROR
);
540 ret
= ctx
->cipher
->cupdate(ctx
->provctx
, out
, &soutl
, in
, (size_t)inl
);
542 if (soutl
> INT_MAX
) {
543 EVPerr(EVP_F_EVP_ENCRYPTUPDATE
, EVP_R_UPDATE_ERROR
);
549 /* TODO(3.0): Remove legacy code below */
552 return evp_EncryptDecryptUpdate(ctx
, out
, outl
, in
, inl
);
555 int EVP_EncryptFinal(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
)
558 ret
= EVP_EncryptFinal_ex(ctx
, out
, outl
);
562 int EVP_EncryptFinal_ex(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
)
565 unsigned int i
, b
, bl
;
568 /* Prevent accidental use of decryption context when encrypting */
570 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX
, EVP_R_INVALID_OPERATION
);
574 if (ctx
->cipher
== NULL
|| ctx
->cipher
->prov
== NULL
)
577 if (ctx
->cipher
->cfinal
== NULL
) {
578 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX
, EVP_R_FINAL_ERROR
);
582 ret
= ctx
->cipher
->cfinal(ctx
->provctx
, out
, &soutl
);
584 if (soutl
> INT_MAX
) {
585 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX
, EVP_R_FINAL_ERROR
);
592 /* TODO(3.0): Remove legacy code below */
595 if (ctx
->cipher
->flags
& EVP_CIPH_FLAG_CUSTOM_CIPHER
) {
596 ret
= ctx
->cipher
->do_cipher(ctx
, out
, NULL
, 0);
604 b
= ctx
->cipher
->block_size
;
605 OPENSSL_assert(b
<= sizeof(ctx
->buf
));
611 if (ctx
->flags
& EVP_CIPH_NO_PADDING
) {
613 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX
,
614 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH
);
622 for (i
= bl
; i
< b
; i
++)
624 ret
= ctx
->cipher
->do_cipher(ctx
, out
, ctx
->buf
, b
);
632 int EVP_DecryptUpdate(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
,
633 const unsigned char *in
, int inl
)
635 int fix_len
, cmpl
= inl
, ret
;
639 /* Prevent accidental use of encryption context when decrypting */
641 EVPerr(EVP_F_EVP_DECRYPTUPDATE
, EVP_R_INVALID_OPERATION
);
645 if (ctx
->cipher
== NULL
|| ctx
->cipher
->prov
== NULL
)
648 if (ctx
->cipher
->cupdate
== NULL
) {
649 EVPerr(EVP_F_EVP_DECRYPTUPDATE
, EVP_R_UPDATE_ERROR
);
652 ret
= ctx
->cipher
->cupdate(ctx
->provctx
, out
, &soutl
, in
, (size_t)inl
);
655 if (soutl
> INT_MAX
) {
656 EVPerr(EVP_F_EVP_DECRYPTUPDATE
, EVP_R_UPDATE_ERROR
);
664 /* TODO(3.0): Remove legacy code below */
667 b
= ctx
->cipher
->block_size
;
669 if (EVP_CIPHER_CTX_test_flags(ctx
, EVP_CIPH_FLAG_LENGTH_BITS
))
670 cmpl
= (cmpl
+ 7) / 8;
677 if (ctx
->cipher
->flags
& EVP_CIPH_FLAG_CUSTOM_CIPHER
) {
678 if (b
== 1 && is_partially_overlapping(out
, in
, cmpl
)) {
679 EVPerr(EVP_F_EVP_DECRYPTUPDATE
, EVP_R_PARTIALLY_OVERLAPPING
);
683 fix_len
= ctx
->cipher
->do_cipher(ctx
, out
, in
, inl
);
692 if (ctx
->flags
& EVP_CIPH_NO_PADDING
)
693 return evp_EncryptDecryptUpdate(ctx
, out
, outl
, in
, inl
);
695 OPENSSL_assert(b
<= sizeof(ctx
->final
));
697 if (ctx
->final_used
) {
698 /* see comment about PTRDIFF_T comparison above */
699 if (((PTRDIFF_T
)out
== (PTRDIFF_T
)in
)
700 || is_partially_overlapping(out
, in
, b
)) {
701 EVPerr(EVP_F_EVP_DECRYPTUPDATE
, EVP_R_PARTIALLY_OVERLAPPING
);
704 memcpy(out
, ctx
->final
, b
);
710 if (!evp_EncryptDecryptUpdate(ctx
, out
, outl
, in
, inl
))
714 * if we have 'decrypted' a multiple of block size, make sure we have a
715 * copy of this last block
717 if (b
> 1 && !ctx
->buf_len
) {
720 memcpy(ctx
->final
, &out
[*outl
], b
);
730 int EVP_DecryptFinal(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
)
733 ret
= EVP_DecryptFinal_ex(ctx
, out
, outl
);
737 int EVP_DecryptFinal_ex(EVP_CIPHER_CTX
*ctx
, unsigned char *out
, int *outl
)
744 /* Prevent accidental use of encryption context when decrypting */
746 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX
, EVP_R_INVALID_OPERATION
);
750 if (ctx
->cipher
== NULL
|| ctx
->cipher
->prov
== NULL
)
753 if (ctx
->cipher
->cfinal
== NULL
) {
754 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX
, EVP_R_FINAL_ERROR
);
758 ret
= ctx
->cipher
->cfinal(ctx
->provctx
, out
, &soutl
);
761 if (soutl
> INT_MAX
) {
762 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX
, EVP_R_FINAL_ERROR
);
770 /* TODO(3.0): Remove legacy code below */
775 if (ctx
->cipher
->flags
& EVP_CIPH_FLAG_CUSTOM_CIPHER
) {
776 i
= ctx
->cipher
->do_cipher(ctx
, out
, NULL
, 0);
784 b
= ctx
->cipher
->block_size
;
785 if (ctx
->flags
& EVP_CIPH_NO_PADDING
) {
787 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX
,
788 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH
);
795 if (ctx
->buf_len
|| !ctx
->final_used
) {
796 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX
, EVP_R_WRONG_FINAL_BLOCK_LENGTH
);
799 OPENSSL_assert(b
<= sizeof(ctx
->final
));
802 * The following assumes that the ciphertext has been authenticated.
803 * Otherwise it provides a padding oracle.
805 n
= ctx
->final
[b
- 1];
806 if (n
== 0 || n
> (int)b
) {
807 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX
, EVP_R_BAD_DECRYPT
);
810 for (i
= 0; i
< n
; i
++) {
811 if (ctx
->final
[--b
] != n
) {
812 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX
, EVP_R_BAD_DECRYPT
);
816 n
= ctx
->cipher
->block_size
- n
;
817 for (i
= 0; i
< n
; i
++)
818 out
[i
] = ctx
->final
[i
];
825 int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX
*c
, int keylen
)
827 if (c
->cipher
->flags
& EVP_CIPH_CUSTOM_KEY_LENGTH
)
828 return EVP_CIPHER_CTX_ctrl(c
, EVP_CTRL_SET_KEY_LENGTH
, keylen
, NULL
);
829 if (EVP_CIPHER_CTX_key_length(c
) == keylen
)
831 if ((keylen
> 0) && (c
->cipher
->flags
& EVP_CIPH_VARIABLE_LENGTH
)) {
835 EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH
, EVP_R_INVALID_KEY_LENGTH
);
839 int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX
*ctx
, int pad
)
842 ctx
->flags
&= ~EVP_CIPH_NO_PADDING
;
844 ctx
->flags
|= EVP_CIPH_NO_PADDING
;
846 if (ctx
->cipher
!= NULL
&& ctx
->cipher
->prov
!= NULL
) {
847 OSSL_PARAM params
[] = {
848 OSSL_PARAM_int(OSSL_CIPHER_PARAM_PADDING
, NULL
),
852 params
[0].data
= &pad
;
854 if (ctx
->cipher
->set_params
== NULL
) {
855 EVPerr(EVP_F_EVP_CIPHER_CTX_SET_PADDING
, EVP_R_CTRL_NOT_IMPLEMENTED
);
859 if (!ctx
->cipher
->set_params(ctx
->provctx
, params
))
866 int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX
*ctx
, int type
, int arg
, void *ptr
)
871 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL
, EVP_R_NO_CIPHER_SET
);
875 if (!ctx
->cipher
->ctrl
) {
876 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL
, EVP_R_CTRL_NOT_IMPLEMENTED
);
880 ret
= ctx
->cipher
->ctrl(ctx
, type
, arg
, ptr
);
882 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL
,
883 EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED
);
889 int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX
*ctx
, unsigned char *key
)
891 if (ctx
->cipher
->flags
& EVP_CIPH_RAND_KEY
)
892 return EVP_CIPHER_CTX_ctrl(ctx
, EVP_CTRL_RAND_KEY
, 0, key
);
893 if (RAND_priv_bytes(key
, ctx
->key_len
) <= 0)
898 int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX
*out
, const EVP_CIPHER_CTX
*in
)
900 if ((in
== NULL
) || (in
->cipher
== NULL
)) {
901 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY
, EVP_R_INPUT_NOT_INITIALIZED
);
905 if (in
->cipher
->prov
== NULL
)
908 if (in
->cipher
->dupctx
== NULL
) {
909 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY
, EVP_R_NOT_ABLE_TO_COPY_CTX
);
913 EVP_CIPHER_CTX_reset(out
);
918 if (in
->fetched_cipher
!= NULL
|| !EVP_CIPHER_upref(in
->fetched_cipher
)) {
919 out
->fetched_cipher
= NULL
;
923 out
->provctx
= in
->cipher
->dupctx(in
->provctx
);
924 if (out
->provctx
== NULL
) {
925 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY
, EVP_R_NOT_ABLE_TO_COPY_CTX
);
931 /* TODO(3.0): Remove legacy code below */
934 #ifndef OPENSSL_NO_ENGINE
935 /* Make sure it's safe to copy a cipher context using an ENGINE */
936 if (in
->engine
&& !ENGINE_init(in
->engine
)) {
937 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY
, ERR_R_ENGINE_LIB
);
942 EVP_CIPHER_CTX_reset(out
);
943 memcpy(out
, in
, sizeof(*out
));
945 if (in
->cipher_data
&& in
->cipher
->ctx_size
) {
946 out
->cipher_data
= OPENSSL_malloc(in
->cipher
->ctx_size
);
947 if (out
->cipher_data
== NULL
) {
949 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY
, ERR_R_MALLOC_FAILURE
);
952 memcpy(out
->cipher_data
, in
->cipher_data
, in
->cipher
->ctx_size
);
955 if (in
->cipher
->flags
& EVP_CIPH_CUSTOM_COPY
)
956 if (!in
->cipher
->ctrl((EVP_CIPHER_CTX
*)in
, EVP_CTRL_COPY
, 0, out
)) {
958 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY
, EVP_R_INITIALIZATION_ERROR
);
964 static void *evp_cipher_from_dispatch(int nid
, const OSSL_DISPATCH
*fns
,
967 EVP_CIPHER
*cipher
= NULL
;
968 int fnciphcnt
= 0, fnctxcnt
= 0;
970 if ((cipher
= EVP_CIPHER_meth_new(nid
, 0, 0)) == NULL
)
973 for (; fns
->function_id
!= 0; fns
++) {
974 switch (fns
->function_id
) {
975 case OSSL_FUNC_CIPHER_NEWCTX
:
976 if (cipher
->newctx
!= NULL
)
978 cipher
->newctx
= OSSL_get_OP_cipher_newctx(fns
);
981 case OSSL_FUNC_CIPHER_ENCRYPT_INIT
:
982 if (cipher
->einit
!= NULL
)
984 cipher
->einit
= OSSL_get_OP_cipher_encrypt_init(fns
);
987 case OSSL_FUNC_CIPHER_DECRYPT_INIT
:
988 if (cipher
->dinit
!= NULL
)
990 cipher
->dinit
= OSSL_get_OP_cipher_decrypt_init(fns
);
993 case OSSL_FUNC_CIPHER_UPDATE
:
994 if (cipher
->cupdate
!= NULL
)
996 cipher
->cupdate
= OSSL_get_OP_cipher_update(fns
);
999 case OSSL_FUNC_CIPHER_FINAL
:
1000 if (cipher
->cfinal
!= NULL
)
1002 cipher
->cfinal
= OSSL_get_OP_cipher_final(fns
);
1005 case OSSL_FUNC_CIPHER_FREECTX
:
1006 if (cipher
->freectx
!= NULL
)
1008 cipher
->freectx
= OSSL_get_OP_cipher_freectx(fns
);
1011 case OSSL_FUNC_CIPHER_DUPCTX
:
1012 if (cipher
->dupctx
!= NULL
)
1014 cipher
->dupctx
= OSSL_get_OP_cipher_dupctx(fns
);
1016 case OSSL_FUNC_CIPHER_KEY_LENGTH
:
1017 if (cipher
->key_length
!= NULL
)
1019 cipher
->key_length
= OSSL_get_OP_cipher_key_length(fns
);
1021 case OSSL_FUNC_CIPHER_GET_PARAMS
:
1022 if (cipher
->get_params
!= NULL
)
1024 cipher
->get_params
= OSSL_get_OP_cipher_get_params(fns
);
1026 case OSSL_FUNC_CIPHER_SET_PARAMS
:
1027 if (cipher
->set_params
!= NULL
)
1029 cipher
->set_params
= OSSL_get_OP_cipher_set_params(fns
);
1033 if ((fnciphcnt
!= 3 && fnciphcnt
!= 4)
1036 * In order to be a consistent set of functions we must have at least
1037 * a complete set of "encrypt" functions, or a complete set of "decrypt"
1038 * functions. In both cases we need a complete set of context management
1041 EVP_CIPHER_meth_free(cipher
);
1042 EVPerr(EVP_F_EVP_CIPHER_FROM_DISPATCH
, EVP_R_INVALID_PROVIDER_FUNCTIONS
);
1045 cipher
->prov
= prov
;
1047 ossl_provider_upref(prov
);
1052 static int evp_cipher_upref(void *cipher
)
1054 return EVP_CIPHER_upref(cipher
);
1057 static void evp_cipher_free(void *cipher
)
1059 EVP_CIPHER_meth_free(cipher
);
1062 static int evp_cipher_nid(void *vcipher
)
1064 EVP_CIPHER
*cipher
= vcipher
;
1069 EVP_CIPHER
*EVP_CIPHER_fetch(OPENSSL_CTX
*ctx
, const char *algorithm
,
1070 const char *properties
)
1072 return evp_generic_fetch(ctx
, OSSL_OP_CIPHER
, algorithm
, properties
,
1073 evp_cipher_from_dispatch
, evp_cipher_upref
,
1074 evp_cipher_free
, evp_cipher_nid
);