2 * Copyright 1995-2019 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 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
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 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
85 ENGINE *tmpimpl = NULL;
87 const EVP_CIPHER *tmpcipher;
90 * enc == 1 means we are encrypting.
91 * enc == 0 means we are decrypting.
92 * enc == -1 means, use the previously initialised value for encrypt/decrypt
102 if (cipher == NULL && ctx->cipher == NULL) {
103 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET);
107 /* TODO(3.0): Legacy work around code below. Remove this */
109 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
111 * Whether it's nice or not, "Inits" can be used on "Final"'d contexts so
112 * this context may already have an ENGINE! Try to avoid releasing the
113 * previous handle, re-querying for an ENGINE, and having a
114 * reinitialisation, when it may all be unnecessary.
116 if (ctx->engine && ctx->cipher
117 && (cipher == NULL || cipher->nid == ctx->cipher->nid))
120 if (cipher != NULL && impl == NULL) {
121 /* Ask if an ENGINE is reserved for this job */
122 tmpimpl = ENGINE_get_cipher_engine(cipher->nid);
127 * If there are engines involved then we should use legacy handling for now.
129 if (ctx->engine != NULL
130 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
134 if (ctx->cipher == ctx->fetched_cipher)
136 EVP_CIPHER_meth_free(ctx->fetched_cipher);
137 ctx->fetched_cipher = NULL;
141 tmpcipher = (cipher == NULL) ? ctx->cipher : cipher;
143 if (tmpcipher->prov == NULL) {
144 switch(tmpcipher->nid) {
145 case NID_aes_256_ecb:
146 case NID_aes_192_ecb:
147 case NID_aes_128_ecb:
148 case NID_aes_256_cbc:
149 case NID_aes_192_cbc:
150 case NID_aes_128_cbc:
151 case NID_aes_256_ofb128:
152 case NID_aes_192_ofb128:
153 case NID_aes_128_ofb128:
154 case NID_aes_256_cfb128:
155 case NID_aes_192_cfb128:
156 case NID_aes_128_cfb128:
157 case NID_aes_256_cfb1:
158 case NID_aes_192_cfb1:
159 case NID_aes_128_cfb1:
160 case NID_aes_256_cfb8:
161 case NID_aes_192_cfb8:
162 case NID_aes_128_cfb8:
163 case NID_aes_256_ctr:
164 case NID_aes_192_ctr:
165 case NID_aes_128_ctr:
166 case NID_aes_256_gcm:
167 case NID_aes_192_gcm:
168 case NID_aes_128_gcm:
169 case NID_aria_256_gcm:
170 case NID_aria_192_gcm:
171 case NID_aria_128_gcm:
172 case NID_aes_256_ccm:
173 case NID_aes_192_ccm:
174 case NID_aes_128_ccm:
175 case NID_aria_256_ccm:
176 case NID_aria_192_ccm:
177 case NID_aria_128_ccm:
178 case NID_aria_256_ecb:
179 case NID_aria_192_ecb:
180 case NID_aria_128_ecb:
181 case NID_aria_256_cbc:
182 case NID_aria_192_cbc:
183 case NID_aria_128_cbc:
184 case NID_aria_256_ofb128:
185 case NID_aria_192_ofb128:
186 case NID_aria_128_ofb128:
187 case NID_aria_256_cfb128:
188 case NID_aria_192_cfb128:
189 case NID_aria_128_cfb128:
190 case NID_aria_256_cfb1:
191 case NID_aria_192_cfb1:
192 case NID_aria_128_cfb1:
193 case NID_aria_256_cfb8:
194 case NID_aria_192_cfb8:
195 case NID_aria_128_cfb8:
196 case NID_aria_256_ctr:
197 case NID_aria_192_ctr:
198 case NID_aria_128_ctr:
199 case NID_camellia_256_ecb:
200 case NID_camellia_192_ecb:
201 case NID_camellia_128_ecb:
202 case NID_camellia_256_cbc:
203 case NID_camellia_192_cbc:
204 case NID_camellia_128_cbc:
205 case NID_camellia_256_ofb128:
206 case NID_camellia_192_ofb128:
207 case NID_camellia_128_ofb128:
208 case NID_camellia_256_cfb128:
209 case NID_camellia_192_cfb128:
210 case NID_camellia_128_cfb128:
211 case NID_camellia_256_cfb1:
212 case NID_camellia_192_cfb1:
213 case NID_camellia_128_cfb1:
214 case NID_camellia_256_cfb8:
215 case NID_camellia_192_cfb8:
216 case NID_camellia_128_cfb8:
217 case NID_camellia_256_ctr:
218 case NID_camellia_192_ctr:
219 case NID_camellia_128_ctr:
227 * Ensure a context left lying around from last time is cleared
230 if (cipher != NULL && ctx->cipher != NULL) {
231 OPENSSL_clear_free(ctx->cipher_data, ctx->cipher->ctx_size);
232 ctx->cipher_data = NULL;
236 /* TODO(3.0): Start of non-legacy code below */
238 /* Ensure a context left lying around from last time is cleared */
239 if (cipher != NULL && ctx->cipher != NULL) {
240 unsigned long flags = ctx->flags;
242 EVP_CIPHER_CTX_reset(ctx);
243 /* Restore encrypt and flags */
249 cipher = ctx->cipher;
251 if (cipher->prov == NULL) {
253 /* We only do explict fetches inside the FIPS module */
254 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
257 EVP_CIPHER *provciph =
258 EVP_CIPHER_fetch(NULL, OBJ_nid2sn(cipher->nid), "");
260 if (provciph == NULL) {
261 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
265 EVP_CIPHER_meth_free(ctx->fetched_cipher);
266 ctx->fetched_cipher = provciph;
270 ctx->cipher = cipher;
271 if (ctx->provctx == NULL) {
272 ctx->provctx = ctx->cipher->newctx(ossl_provider_ctx(cipher->prov));
273 if (ctx->provctx == NULL) {
274 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
279 if ((ctx->flags & EVP_CIPH_NO_PADDING) != 0) {
281 * If this ctx was already set up for no padding then we need to tell
282 * the new cipher about it.
284 if (!EVP_CIPHER_CTX_set_padding(ctx, 0))
288 switch (EVP_CIPHER_mode(ctx->cipher)) {
289 case EVP_CIPH_CFB_MODE:
290 case EVP_CIPH_OFB_MODE:
291 case EVP_CIPH_CBC_MODE:
292 /* For these modes we remember the original IV for later use */
293 if (!ossl_assert(EVP_CIPHER_CTX_iv_length(ctx) <= (int)sizeof(ctx->oiv))) {
294 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
298 memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
302 if (ctx->cipher->einit == NULL) {
303 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
307 return ctx->cipher->einit(ctx->provctx,
310 : EVP_CIPHER_CTX_key_length(ctx),
313 : EVP_CIPHER_CTX_iv_length(ctx));
316 if (ctx->cipher->dinit == NULL) {
317 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
321 return ctx->cipher->dinit(ctx->provctx,
324 : EVP_CIPHER_CTX_key_length(ctx),
327 : EVP_CIPHER_CTX_iv_length(ctx));
329 /* TODO(3.0): Remove legacy code below */
332 if (cipher != NULL) {
334 * Ensure a context left lying around from last time is cleared (we
335 * previously attempted to avoid this if the same ENGINE and
336 * EVP_CIPHER could be used).
339 unsigned long flags = ctx->flags;
340 EVP_CIPHER_CTX_reset(ctx);
341 /* Restore encrypt and flags */
345 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
347 if (!ENGINE_init(impl)) {
348 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
355 /* There's an ENGINE for this job ... (apparently) */
356 const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid);
360 * One positive side-effect of US's export control history,
361 * is that we should at least be able to avoid using US
362 * misspellings of "initialisation"?
364 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
367 /* We'll use the ENGINE's private cipher definition */
370 * Store the ENGINE functional reference so we know 'cipher' came
371 * from an ENGINE and we need to release it when done.
379 ctx->cipher = cipher;
380 if (ctx->cipher->ctx_size) {
381 ctx->cipher_data = OPENSSL_zalloc(ctx->cipher->ctx_size);
382 if (ctx->cipher_data == NULL) {
384 EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE);
388 ctx->cipher_data = NULL;
390 ctx->key_len = cipher->key_len;
391 /* Preserve wrap enable flag, zero everything else */
392 ctx->flags &= EVP_CIPHER_CTX_FLAG_WRAP_ALLOW;
393 if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) {
394 if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) {
396 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
401 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
404 if (ctx->cipher == NULL)
407 /* we assume block size is a power of 2 in *cryptUpdate */
408 OPENSSL_assert(ctx->cipher->block_size == 1
409 || ctx->cipher->block_size == 8
410 || ctx->cipher->block_size == 16);
412 if (!(ctx->flags & EVP_CIPHER_CTX_FLAG_WRAP_ALLOW)
413 && EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_WRAP_MODE) {
414 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_WRAP_MODE_NOT_ALLOWED);
418 if (!(EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(ctx)) & EVP_CIPH_CUSTOM_IV)) {
419 switch (EVP_CIPHER_CTX_mode(ctx)) {
421 case EVP_CIPH_STREAM_CIPHER:
422 case EVP_CIPH_ECB_MODE:
425 case EVP_CIPH_CFB_MODE:
426 case EVP_CIPH_OFB_MODE:
431 case EVP_CIPH_CBC_MODE:
433 OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <=
434 (int)sizeof(ctx->iv));
436 memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
437 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
440 case EVP_CIPH_CTR_MODE:
442 /* Don't reuse IV for CTR mode */
444 memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx));
452 if (key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
453 if (!ctx->cipher->init(ctx, key, iv, enc))
458 ctx->block_mask = ctx->cipher->block_size - 1;
462 int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
463 const unsigned char *in, int inl)
466 return EVP_EncryptUpdate(ctx, out, outl, in, inl);
468 return EVP_DecryptUpdate(ctx, out, outl, in, inl);
471 int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
474 return EVP_EncryptFinal_ex(ctx, out, outl);
476 return EVP_DecryptFinal_ex(ctx, out, outl);
479 int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
482 return EVP_EncryptFinal(ctx, out, outl);
484 return EVP_DecryptFinal(ctx, out, outl);
487 int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
488 const unsigned char *key, const unsigned char *iv)
490 return EVP_CipherInit(ctx, cipher, key, iv, 1);
493 int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
494 ENGINE *impl, const unsigned char *key,
495 const unsigned char *iv)
497 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
500 int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
501 const unsigned char *key, const unsigned char *iv)
503 return EVP_CipherInit(ctx, cipher, key, iv, 0);
506 int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
507 ENGINE *impl, const unsigned char *key,
508 const unsigned char *iv)
510 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
514 * According to the letter of standard difference between pointers
515 * is specified to be valid only within same object. This makes
516 * it formally challenging to determine if input and output buffers
517 * are not partially overlapping with standard pointer arithmetic.
522 #if defined(OPENSSL_SYS_VMS) && __INITIAL_POINTER_SIZE==64
524 * Then we have VMS that distinguishes itself by adhering to
525 * sizeof(size_t)==4 even in 64-bit builds, which means that
526 * difference between two pointers might be truncated to 32 bits.
527 * In the context one can even wonder how comparison for
528 * equality is implemented. To be on the safe side we adhere to
529 * PTRDIFF_T even for comparison for equality.
531 # define PTRDIFF_T uint64_t
533 # define PTRDIFF_T size_t
536 int is_partially_overlapping(const void *ptr1, const void *ptr2, int len)
538 PTRDIFF_T diff = (PTRDIFF_T)ptr1-(PTRDIFF_T)ptr2;
540 * Check for partially overlapping buffers. [Binary logical
541 * operations are used instead of boolean to minimize number
542 * of conditional branches.]
544 int overlapped = (len > 0) & (diff != 0) & ((diff < (PTRDIFF_T)len) |
545 (diff > (0 - (PTRDIFF_T)len)));
550 static int evp_EncryptDecryptUpdate(EVP_CIPHER_CTX *ctx,
551 unsigned char *out, int *outl,
552 const unsigned char *in, int inl)
554 int i, j, bl, cmpl = inl;
556 if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
557 cmpl = (cmpl + 7) / 8;
559 bl = ctx->cipher->block_size;
561 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
562 /* If block size > 1 then the cipher will have to do this check */
563 if (bl == 1 && is_partially_overlapping(out, in, cmpl)) {
564 EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
568 i = ctx->cipher->do_cipher(ctx, out, in, inl);
580 if (is_partially_overlapping(out + ctx->buf_len, in, cmpl)) {
581 EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
585 if (ctx->buf_len == 0 && (inl & (ctx->block_mask)) == 0) {
586 if (ctx->cipher->do_cipher(ctx, out, in, inl)) {
595 OPENSSL_assert(bl <= (int)sizeof(ctx->buf));
598 memcpy(&(ctx->buf[i]), in, inl);
604 memcpy(&(ctx->buf[i]), in, j);
607 if (!ctx->cipher->do_cipher(ctx, out, ctx->buf, bl))
617 if (!ctx->cipher->do_cipher(ctx, out, in, inl))
623 memcpy(ctx->buf, &(in[inl]), i);
629 int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
630 const unsigned char *in, int inl)
636 /* Prevent accidental use of decryption context when encrypting */
638 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_INVALID_OPERATION);
642 if (ctx->cipher == NULL) {
643 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_NO_CIPHER_SET);
647 if (ctx->cipher->prov == NULL)
650 blocksize = EVP_CIPHER_CTX_block_size(ctx);
652 if (ctx->cipher->cupdate == NULL || blocksize < 1) {
653 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR);
656 ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl,
657 inl + (blocksize == 1 ? 0 : blocksize), in,
661 if (soutl > INT_MAX) {
662 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR);
670 /* TODO(3.0): Remove legacy code below */
673 return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl);
676 int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
679 ret = EVP_EncryptFinal_ex(ctx, out, outl);
683 int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
686 unsigned int i, b, bl;
690 /* Prevent accidental use of decryption context when encrypting */
692 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_INVALID_OPERATION);
696 if (ctx->cipher == NULL) {
697 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_NO_CIPHER_SET);
700 if (ctx->cipher->prov == NULL)
703 blocksize = EVP_CIPHER_CTX_block_size(ctx);
705 if (blocksize < 1 || ctx->cipher->cfinal == NULL) {
706 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR);
710 ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl,
711 blocksize == 1 ? 0 : blocksize);
714 if (soutl > INT_MAX) {
715 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR);
723 /* TODO(3.0): Remove legacy code below */
726 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
727 ret = ctx->cipher->do_cipher(ctx, out, NULL, 0);
735 b = ctx->cipher->block_size;
736 OPENSSL_assert(b <= sizeof(ctx->buf));
742 if (ctx->flags & EVP_CIPH_NO_PADDING) {
744 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,
745 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
753 for (i = bl; i < b; i++)
755 ret = ctx->cipher->do_cipher(ctx, out, ctx->buf, b);
763 int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
764 const unsigned char *in, int inl)
766 int fix_len, cmpl = inl, ret;
771 /* Prevent accidental use of encryption context when decrypting */
773 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_INVALID_OPERATION);
777 if (ctx->cipher == NULL) {
778 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_NO_CIPHER_SET);
781 if (ctx->cipher->prov == NULL)
784 blocksize = EVP_CIPHER_CTX_block_size(ctx);
786 if (ctx->cipher->cupdate == NULL || blocksize < 1) {
787 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR);
790 ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl,
791 inl + (blocksize == 1 ? 0 : blocksize), in,
795 if (soutl > INT_MAX) {
796 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR);
804 /* TODO(3.0): Remove legacy code below */
807 b = ctx->cipher->block_size;
809 if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
810 cmpl = (cmpl + 7) / 8;
812 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
813 if (b == 1 && is_partially_overlapping(out, in, cmpl)) {
814 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
818 fix_len = ctx->cipher->do_cipher(ctx, out, in, inl);
832 if (ctx->flags & EVP_CIPH_NO_PADDING)
833 return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl);
835 OPENSSL_assert(b <= sizeof(ctx->final));
837 if (ctx->final_used) {
838 /* see comment about PTRDIFF_T comparison above */
839 if (((PTRDIFF_T)out == (PTRDIFF_T)in)
840 || is_partially_overlapping(out, in, b)) {
841 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
844 memcpy(out, ctx->final, b);
850 if (!evp_EncryptDecryptUpdate(ctx, out, outl, in, inl))
854 * if we have 'decrypted' a multiple of block size, make sure we have a
855 * copy of this last block
857 if (b > 1 && !ctx->buf_len) {
860 memcpy(ctx->final, &out[*outl], b);
870 int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
873 ret = EVP_DecryptFinal_ex(ctx, out, outl);
877 int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
885 /* Prevent accidental use of encryption context when decrypting */
887 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_INVALID_OPERATION);
891 if (ctx->cipher == NULL) {
892 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_NO_CIPHER_SET);
896 if (ctx->cipher->prov == NULL)
899 blocksize = EVP_CIPHER_CTX_block_size(ctx);
901 if (blocksize < 1 || ctx->cipher->cfinal == NULL) {
902 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR);
906 ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl,
907 blocksize == 1 ? 0 : blocksize);
910 if (soutl > INT_MAX) {
911 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR);
919 /* TODO(3.0): Remove legacy code below */
923 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
924 i = ctx->cipher->do_cipher(ctx, out, NULL, 0);
932 b = ctx->cipher->block_size;
933 if (ctx->flags & EVP_CIPH_NO_PADDING) {
935 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,
936 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
943 if (ctx->buf_len || !ctx->final_used) {
944 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_WRONG_FINAL_BLOCK_LENGTH);
947 OPENSSL_assert(b <= sizeof(ctx->final));
950 * The following assumes that the ciphertext has been authenticated.
951 * Otherwise it provides a padding oracle.
953 n = ctx->final[b - 1];
954 if (n == 0 || n > (int)b) {
955 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
958 for (i = 0; i < n; i++) {
959 if (ctx->final[--b] != n) {
960 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
964 n = ctx->cipher->block_size - n;
965 for (i = 0; i < n; i++)
966 out[i] = ctx->final[i];
973 int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
976 OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
978 params[0] = OSSL_PARAM_construct_int(OSSL_CIPHER_PARAM_KEYLEN, &keylen);
979 ok = evp_do_ciph_ctx_setparams(c->cipher, c->provctx, params);
981 if (ok != EVP_CTRL_RET_UNSUPPORTED)
984 /* TODO(3.0) legacy code follows */
985 if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
986 return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
987 if (EVP_CIPHER_CTX_key_length(c) == keylen)
989 if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) {
993 EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH, EVP_R_INVALID_KEY_LENGTH);
997 int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
1000 OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
1003 ctx->flags &= ~EVP_CIPH_NO_PADDING;
1005 ctx->flags |= EVP_CIPH_NO_PADDING;
1007 params[0] = OSSL_PARAM_construct_int(OSSL_CIPHER_PARAM_PADDING, &pad);
1008 ok = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1013 int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
1015 int ret = EVP_CTRL_RET_UNSUPPORTED;
1018 OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
1020 if (ctx == NULL || ctx->cipher == NULL) {
1021 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
1025 if (ctx->cipher->prov == NULL)
1029 case EVP_CTRL_SET_KEY_LENGTH:
1030 params[0] = OSSL_PARAM_construct_int(OSSL_CIPHER_PARAM_KEYLEN, &arg);
1032 case EVP_CTRL_RAND_KEY: /* Used by DES */
1033 case EVP_CTRL_SET_PIPELINE_OUTPUT_BUFS: /* Used by DASYNC */
1034 case EVP_CTRL_INIT: /* TODO(3.0) Purely legacy, no provider counterpart */
1036 return EVP_CTRL_RET_UNSUPPORTED;
1037 case EVP_CTRL_GET_IV:
1039 params[0] = OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_IV,
1042 case EVP_CTRL_AEAD_SET_IVLEN:
1047 OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_AEAD_IVLEN, &sz);
1049 case EVP_CTRL_GCM_SET_IV_FIXED:
1051 OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TLS1_IV_FIXED,
1054 case EVP_CTRL_AEAD_SET_TAG:
1056 OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TAG,
1059 case EVP_CTRL_AEAD_GET_TAG:
1061 params[0] = OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TAG,
1064 case EVP_CTRL_AEAD_TLS1_AAD:
1065 /* This one does a set and a get - since it returns a padding size */
1067 OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TLS1_AAD,
1069 ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1073 OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_AEAD_TLS1_AAD_PAD, &sz);
1074 ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
1081 ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1083 ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
1086 /* TODO(3.0): Remove legacy code below */
1088 if (ctx->cipher->ctrl == NULL) {
1089 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
1093 ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
1094 if (ret == EVP_CTRL_RET_UNSUPPORTED) {
1095 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL,
1096 EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
1102 int EVP_CIPHER_get_params(EVP_CIPHER *cipher, OSSL_PARAM params[])
1104 if (cipher != NULL && cipher->get_params != NULL)
1105 return cipher->get_params(params);
1109 int EVP_CIPHER_CTX_set_params(EVP_CIPHER_CTX *ctx, const OSSL_PARAM params[])
1111 if (ctx->cipher != NULL && ctx->cipher->set_ctx_params != NULL)
1112 return ctx->cipher->set_ctx_params(ctx->provctx, params);
1116 int EVP_CIPHER_CTX_get_params(EVP_CIPHER_CTX *ctx, OSSL_PARAM params[])
1118 if (ctx->cipher != NULL && ctx->cipher->get_ctx_params != NULL)
1119 return ctx->cipher->get_ctx_params(ctx->provctx, params);
1123 const OSSL_PARAM *EVP_CIPHER_gettable_params(const EVP_CIPHER *cipher)
1125 if (cipher != NULL && cipher->gettable_params != NULL)
1126 return cipher->gettable_params();
1130 const OSSL_PARAM *EVP_CIPHER_CTX_settable_params(const EVP_CIPHER *cipher)
1132 if (cipher != NULL && cipher->settable_ctx_params != NULL)
1133 return cipher->settable_ctx_params();
1137 const OSSL_PARAM *EVP_CIPHER_CTX_gettable_params(const EVP_CIPHER *cipher)
1139 if (cipher != NULL && cipher->gettable_ctx_params != NULL)
1140 return cipher->gettable_ctx_params();
1144 #if !defined(FIPS_MODE)
1145 /* TODO(3.0): No support for RAND yet in the FIPS module */
1146 int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key)
1149 if (ctx->cipher->flags & EVP_CIPH_RAND_KEY)
1150 return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key);
1151 kl = EVP_CIPHER_CTX_key_length(ctx);
1152 if (kl <= 0 || RAND_priv_bytes(key, kl) <= 0)
1158 int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in)
1160 if ((in == NULL) || (in->cipher == NULL)) {
1161 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INPUT_NOT_INITIALIZED);
1165 if (in->cipher->prov == NULL)
1168 if (in->cipher->dupctx == NULL) {
1169 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX);
1173 EVP_CIPHER_CTX_reset(out);
1176 out->provctx = NULL;
1178 if (in->fetched_cipher != NULL && !EVP_CIPHER_up_ref(in->fetched_cipher)) {
1179 out->fetched_cipher = NULL;
1183 out->provctx = in->cipher->dupctx(in->provctx);
1184 if (out->provctx == NULL) {
1185 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX);
1191 /* TODO(3.0): Remove legacy code below */
1194 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
1195 /* Make sure it's safe to copy a cipher context using an ENGINE */
1196 if (in->engine && !ENGINE_init(in->engine)) {
1197 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_ENGINE_LIB);
1202 EVP_CIPHER_CTX_reset(out);
1203 memcpy(out, in, sizeof(*out));
1205 if (in->cipher_data && in->cipher->ctx_size) {
1206 out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size);
1207 if (out->cipher_data == NULL) {
1209 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_MALLOC_FAILURE);
1212 memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size);
1215 if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY)
1216 if (!in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out)) {
1218 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INITIALIZATION_ERROR);
1224 static void *evp_cipher_from_dispatch(const char *name,
1225 const OSSL_DISPATCH *fns,
1226 OSSL_PROVIDER *prov)
1228 EVP_CIPHER *cipher = NULL;
1229 int fnciphcnt = 0, fnctxcnt = 0;
1232 * The legacy NID is set by EVP_CIPHER_fetch() if the name exists in
1233 * the object database.
1235 if ((cipher = EVP_CIPHER_meth_new(0, 0, 0)) == NULL
1236 || (cipher->name = OPENSSL_strdup(name)) == NULL) {
1237 EVP_CIPHER_meth_free(cipher);
1238 EVPerr(0, ERR_R_MALLOC_FAILURE);
1242 for (; fns->function_id != 0; fns++) {
1243 switch (fns->function_id) {
1244 case OSSL_FUNC_CIPHER_NEWCTX:
1245 if (cipher->newctx != NULL)
1247 cipher->newctx = OSSL_get_OP_cipher_newctx(fns);
1250 case OSSL_FUNC_CIPHER_ENCRYPT_INIT:
1251 if (cipher->einit != NULL)
1253 cipher->einit = OSSL_get_OP_cipher_encrypt_init(fns);
1256 case OSSL_FUNC_CIPHER_DECRYPT_INIT:
1257 if (cipher->dinit != NULL)
1259 cipher->dinit = OSSL_get_OP_cipher_decrypt_init(fns);
1262 case OSSL_FUNC_CIPHER_UPDATE:
1263 if (cipher->cupdate != NULL)
1265 cipher->cupdate = OSSL_get_OP_cipher_update(fns);
1268 case OSSL_FUNC_CIPHER_FINAL:
1269 if (cipher->cfinal != NULL)
1271 cipher->cfinal = OSSL_get_OP_cipher_final(fns);
1274 case OSSL_FUNC_CIPHER_CIPHER:
1275 if (cipher->ccipher != NULL)
1277 cipher->ccipher = OSSL_get_OP_cipher_cipher(fns);
1279 case OSSL_FUNC_CIPHER_FREECTX:
1280 if (cipher->freectx != NULL)
1282 cipher->freectx = OSSL_get_OP_cipher_freectx(fns);
1285 case OSSL_FUNC_CIPHER_DUPCTX:
1286 if (cipher->dupctx != NULL)
1288 cipher->dupctx = OSSL_get_OP_cipher_dupctx(fns);
1290 case OSSL_FUNC_CIPHER_GET_PARAMS:
1291 if (cipher->get_params != NULL)
1293 cipher->get_params = OSSL_get_OP_cipher_get_params(fns);
1295 case OSSL_FUNC_CIPHER_GET_CTX_PARAMS:
1296 if (cipher->get_ctx_params != NULL)
1298 cipher->get_ctx_params = OSSL_get_OP_cipher_get_ctx_params(fns);
1300 case OSSL_FUNC_CIPHER_SET_CTX_PARAMS:
1301 if (cipher->set_ctx_params != NULL)
1303 cipher->set_ctx_params = OSSL_get_OP_cipher_set_ctx_params(fns);
1305 case OSSL_FUNC_CIPHER_GETTABLE_PARAMS:
1306 if (cipher->gettable_params != NULL)
1308 cipher->gettable_params = OSSL_get_OP_cipher_gettable_params(fns);
1310 case OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS:
1311 if (cipher->gettable_ctx_params != NULL)
1313 cipher->gettable_ctx_params =
1314 OSSL_get_OP_cipher_gettable_ctx_params(fns);
1316 case OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS:
1317 if (cipher->settable_ctx_params != NULL)
1319 cipher->settable_ctx_params =
1320 OSSL_get_OP_cipher_settable_ctx_params(fns);
1324 if ((fnciphcnt != 0 && fnciphcnt != 3 && fnciphcnt != 4)
1325 || (fnciphcnt == 0 && cipher->ccipher == NULL)
1328 * In order to be a consistent set of functions we must have at least
1329 * a complete set of "encrypt" functions, or a complete set of "decrypt"
1330 * functions, or a single "cipher" function. In all cases we need both
1331 * the "newctx" and "freectx" functions.
1333 EVP_CIPHER_meth_free(cipher);
1334 EVPerr(EVP_F_EVP_CIPHER_FROM_DISPATCH, EVP_R_INVALID_PROVIDER_FUNCTIONS);
1337 cipher->prov = prov;
1339 ossl_provider_up_ref(prov);
1344 static int evp_cipher_up_ref(void *cipher)
1346 return EVP_CIPHER_up_ref(cipher);
1349 static void evp_cipher_free(void *cipher)
1351 EVP_CIPHER_meth_free(cipher);
1354 EVP_CIPHER *EVP_CIPHER_fetch(OPENSSL_CTX *ctx, const char *algorithm,
1355 const char *properties)
1357 EVP_CIPHER *cipher =
1358 evp_generic_fetch(ctx, OSSL_OP_CIPHER, algorithm, properties,
1359 evp_cipher_from_dispatch, evp_cipher_up_ref,
1363 /* TODO(3.x) get rid of the need for legacy NIDs */
1364 if (cipher != NULL) {
1366 * FIPS module note: since internal fetches will be entirely
1367 * provider based, we know that none of its code depends on legacy
1368 * NIDs or any functionality that use them.
1370 cipher->nid = OBJ_sn2nid(algorithm);
1377 void EVP_CIPHER_do_all_ex(OPENSSL_CTX *libctx,
1378 void (*fn)(EVP_CIPHER *mac, void *arg),
1381 evp_generic_do_all(libctx, OSSL_OP_CIPHER,
1382 (void (*)(void *, void *))fn, arg,
1383 evp_cipher_from_dispatch, evp_cipher_free);