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 "crypto/evp.h"
21 #include "internal/provider.h"
22 #include "evp_local.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_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_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_128_xts:
167 case NID_aes_256_xts:
168 case NID_aes_256_ocb:
169 case NID_aes_192_ocb:
170 case NID_aes_128_ocb:
171 case NID_aes_256_gcm:
172 case NID_aes_192_gcm:
173 case NID_aes_128_gcm:
174 case NID_id_aes256_wrap:
175 case NID_id_aes256_wrap_pad:
176 case NID_id_aes192_wrap:
177 case NID_id_aes192_wrap_pad:
178 case NID_id_aes128_wrap:
179 case NID_id_aes128_wrap_pad:
180 case NID_aria_256_gcm:
181 case NID_aria_192_gcm:
182 case NID_aria_128_gcm:
183 case NID_aes_256_ccm:
184 case NID_aes_192_ccm:
185 case NID_aes_128_ccm:
186 case NID_aria_256_ccm:
187 case NID_aria_192_ccm:
188 case NID_aria_128_ccm:
189 case NID_aria_256_ecb:
190 case NID_aria_192_ecb:
191 case NID_aria_128_ecb:
192 case NID_aria_256_cbc:
193 case NID_aria_192_cbc:
194 case NID_aria_128_cbc:
195 case NID_aria_256_ofb128:
196 case NID_aria_192_ofb128:
197 case NID_aria_128_ofb128:
198 case NID_aria_256_cfb128:
199 case NID_aria_192_cfb128:
200 case NID_aria_128_cfb128:
201 case NID_aria_256_cfb1:
202 case NID_aria_192_cfb1:
203 case NID_aria_128_cfb1:
204 case NID_aria_256_cfb8:
205 case NID_aria_192_cfb8:
206 case NID_aria_128_cfb8:
207 case NID_aria_256_ctr:
208 case NID_aria_192_ctr:
209 case NID_aria_128_ctr:
210 case NID_camellia_256_ecb:
211 case NID_camellia_192_ecb:
212 case NID_camellia_128_ecb:
213 case NID_camellia_256_cbc:
214 case NID_camellia_192_cbc:
215 case NID_camellia_128_cbc:
216 case NID_camellia_256_ofb128:
217 case NID_camellia_192_ofb128:
218 case NID_camellia_128_ofb128:
219 case NID_camellia_256_cfb128:
220 case NID_camellia_192_cfb128:
221 case NID_camellia_128_cfb128:
222 case NID_camellia_256_cfb1:
223 case NID_camellia_192_cfb1:
224 case NID_camellia_128_cfb1:
225 case NID_camellia_256_cfb8:
226 case NID_camellia_192_cfb8:
227 case NID_camellia_128_cfb8:
228 case NID_camellia_256_ctr:
229 case NID_camellia_192_ctr:
230 case NID_camellia_128_ctr:
231 case NID_des_ede3_cbc:
232 case NID_des_ede3_ecb:
233 case NID_des_ede3_ofb64:
234 case NID_des_ede3_cfb64:
235 case NID_des_ede3_cfb8:
236 case NID_des_ede3_cfb1:
237 case NID_des_ede_cbc:
238 case NID_des_ede_ecb:
239 case NID_des_ede_ofb64:
240 case NID_des_ede_cfb64:
248 case NID_id_smime_alg_CMS3DESwrap:
259 case NID_cast5_cfb64:
260 case NID_cast5_ofb64:
263 case NID_seed_cfb128:
264 case NID_seed_ofb128:
283 * Ensure a context left lying around from last time is cleared
286 if (cipher != NULL && ctx->cipher != NULL) {
287 OPENSSL_clear_free(ctx->cipher_data, ctx->cipher->ctx_size);
288 ctx->cipher_data = NULL;
292 /* TODO(3.0): Start of non-legacy code below */
294 /* Ensure a context left lying around from last time is cleared */
295 if (cipher != NULL && ctx->cipher != NULL) {
296 unsigned long flags = ctx->flags;
298 EVP_CIPHER_CTX_reset(ctx);
299 /* Restore encrypt and flags */
305 cipher = ctx->cipher;
307 if (cipher->prov == NULL) {
309 /* We only do explict fetches inside the FIPS module */
310 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
313 EVP_CIPHER *provciph =
314 EVP_CIPHER_fetch(NULL, OBJ_nid2sn(cipher->nid), "");
316 if (provciph == NULL) {
317 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
321 EVP_CIPHER_free(ctx->fetched_cipher);
322 ctx->fetched_cipher = provciph;
326 ctx->cipher = cipher;
327 if (ctx->provctx == NULL) {
328 ctx->provctx = ctx->cipher->newctx(ossl_provider_ctx(cipher->prov));
329 if (ctx->provctx == NULL) {
330 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
335 if ((ctx->flags & EVP_CIPH_NO_PADDING) != 0) {
337 * If this ctx was already set up for no padding then we need to tell
338 * the new cipher about it.
340 if (!EVP_CIPHER_CTX_set_padding(ctx, 0))
345 if (ctx->cipher->einit == NULL) {
346 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
350 return ctx->cipher->einit(ctx->provctx,
353 : EVP_CIPHER_CTX_key_length(ctx),
356 : EVP_CIPHER_CTX_iv_length(ctx));
359 if (ctx->cipher->dinit == NULL) {
360 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
364 return ctx->cipher->dinit(ctx->provctx,
367 : EVP_CIPHER_CTX_key_length(ctx),
370 : EVP_CIPHER_CTX_iv_length(ctx));
372 /* TODO(3.0): Remove legacy code below */
375 if (cipher != NULL) {
377 * Ensure a context left lying around from last time is cleared (we
378 * previously attempted to avoid this if the same ENGINE and
379 * EVP_CIPHER could be used).
382 unsigned long flags = ctx->flags;
383 EVP_CIPHER_CTX_reset(ctx);
384 /* Restore encrypt and flags */
388 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
390 if (!ENGINE_init(impl)) {
391 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
398 /* There's an ENGINE for this job ... (apparently) */
399 const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid);
403 * One positive side-effect of US's export control history,
404 * is that we should at least be able to avoid using US
405 * misspellings of "initialisation"?
407 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
410 /* We'll use the ENGINE's private cipher definition */
413 * Store the ENGINE functional reference so we know 'cipher' came
414 * from an ENGINE and we need to release it when done.
422 ctx->cipher = cipher;
423 if (ctx->cipher->ctx_size) {
424 ctx->cipher_data = OPENSSL_zalloc(ctx->cipher->ctx_size);
425 if (ctx->cipher_data == NULL) {
427 EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE);
431 ctx->cipher_data = NULL;
433 ctx->key_len = cipher->key_len;
434 /* Preserve wrap enable flag, zero everything else */
435 ctx->flags &= EVP_CIPHER_CTX_FLAG_WRAP_ALLOW;
436 if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) {
437 if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) {
439 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
444 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
447 if (ctx->cipher == NULL)
450 /* we assume block size is a power of 2 in *cryptUpdate */
451 OPENSSL_assert(ctx->cipher->block_size == 1
452 || ctx->cipher->block_size == 8
453 || ctx->cipher->block_size == 16);
455 if (!(ctx->flags & EVP_CIPHER_CTX_FLAG_WRAP_ALLOW)
456 && EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_WRAP_MODE) {
457 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_WRAP_MODE_NOT_ALLOWED);
461 if (!(EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(ctx)) & EVP_CIPH_CUSTOM_IV)) {
462 switch (EVP_CIPHER_CTX_mode(ctx)) {
464 case EVP_CIPH_STREAM_CIPHER:
465 case EVP_CIPH_ECB_MODE:
468 case EVP_CIPH_CFB_MODE:
469 case EVP_CIPH_OFB_MODE:
474 case EVP_CIPH_CBC_MODE:
476 OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <=
477 (int)sizeof(ctx->iv));
479 memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
480 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
483 case EVP_CIPH_CTR_MODE:
485 /* Don't reuse IV for CTR mode */
487 memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx));
495 if (key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
496 if (!ctx->cipher->init(ctx, key, iv, enc))
501 ctx->block_mask = ctx->cipher->block_size - 1;
505 int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
506 const unsigned char *in, int inl)
509 return EVP_EncryptUpdate(ctx, out, outl, in, inl);
511 return EVP_DecryptUpdate(ctx, out, outl, in, inl);
514 int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
517 return EVP_EncryptFinal_ex(ctx, out, outl);
519 return EVP_DecryptFinal_ex(ctx, out, outl);
522 int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
525 return EVP_EncryptFinal(ctx, out, outl);
527 return EVP_DecryptFinal(ctx, out, outl);
530 int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
531 const unsigned char *key, const unsigned char *iv)
533 return EVP_CipherInit(ctx, cipher, key, iv, 1);
536 int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
537 ENGINE *impl, const unsigned char *key,
538 const unsigned char *iv)
540 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
543 int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
544 const unsigned char *key, const unsigned char *iv)
546 return EVP_CipherInit(ctx, cipher, key, iv, 0);
549 int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
550 ENGINE *impl, const unsigned char *key,
551 const unsigned char *iv)
553 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
557 * According to the letter of standard difference between pointers
558 * is specified to be valid only within same object. This makes
559 * it formally challenging to determine if input and output buffers
560 * are not partially overlapping with standard pointer arithmetic.
565 #if defined(OPENSSL_SYS_VMS) && __INITIAL_POINTER_SIZE==64
567 * Then we have VMS that distinguishes itself by adhering to
568 * sizeof(size_t)==4 even in 64-bit builds, which means that
569 * difference between two pointers might be truncated to 32 bits.
570 * In the context one can even wonder how comparison for
571 * equality is implemented. To be on the safe side we adhere to
572 * PTRDIFF_T even for comparison for equality.
574 # define PTRDIFF_T uint64_t
576 # define PTRDIFF_T size_t
579 int is_partially_overlapping(const void *ptr1, const void *ptr2, int len)
581 PTRDIFF_T diff = (PTRDIFF_T)ptr1-(PTRDIFF_T)ptr2;
583 * Check for partially overlapping buffers. [Binary logical
584 * operations are used instead of boolean to minimize number
585 * of conditional branches.]
587 int overlapped = (len > 0) & (diff != 0) & ((diff < (PTRDIFF_T)len) |
588 (diff > (0 - (PTRDIFF_T)len)));
593 static int evp_EncryptDecryptUpdate(EVP_CIPHER_CTX *ctx,
594 unsigned char *out, int *outl,
595 const unsigned char *in, int inl)
597 int i, j, bl, cmpl = inl;
599 if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
600 cmpl = (cmpl + 7) / 8;
602 bl = ctx->cipher->block_size;
604 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
605 /* If block size > 1 then the cipher will have to do this check */
606 if (bl == 1 && is_partially_overlapping(out, in, cmpl)) {
607 EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
611 i = ctx->cipher->do_cipher(ctx, out, in, inl);
623 if (is_partially_overlapping(out + ctx->buf_len, in, cmpl)) {
624 EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
628 if (ctx->buf_len == 0 && (inl & (ctx->block_mask)) == 0) {
629 if (ctx->cipher->do_cipher(ctx, out, in, inl)) {
638 OPENSSL_assert(bl <= (int)sizeof(ctx->buf));
641 memcpy(&(ctx->buf[i]), in, inl);
647 memcpy(&(ctx->buf[i]), in, j);
650 if (!ctx->cipher->do_cipher(ctx, out, ctx->buf, bl))
660 if (!ctx->cipher->do_cipher(ctx, out, in, inl))
666 memcpy(ctx->buf, &(in[inl]), i);
672 int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
673 const unsigned char *in, int inl)
679 /* Prevent accidental use of decryption context when encrypting */
681 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_INVALID_OPERATION);
685 if (ctx->cipher == NULL) {
686 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_NO_CIPHER_SET);
690 if (ctx->cipher->prov == NULL)
693 blocksize = EVP_CIPHER_CTX_block_size(ctx);
695 if (ctx->cipher->cupdate == NULL || blocksize < 1) {
696 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR);
699 ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl,
700 inl + (blocksize == 1 ? 0 : blocksize), in,
704 if (soutl > INT_MAX) {
705 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR);
713 /* TODO(3.0): Remove legacy code below */
716 return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl);
719 int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
722 ret = EVP_EncryptFinal_ex(ctx, out, outl);
726 int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
729 unsigned int i, b, bl;
733 /* Prevent accidental use of decryption context when encrypting */
735 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_INVALID_OPERATION);
739 if (ctx->cipher == NULL) {
740 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_NO_CIPHER_SET);
743 if (ctx->cipher->prov == NULL)
746 blocksize = EVP_CIPHER_CTX_block_size(ctx);
748 if (blocksize < 1 || ctx->cipher->cfinal == NULL) {
749 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR);
753 ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl,
754 blocksize == 1 ? 0 : blocksize);
757 if (soutl > INT_MAX) {
758 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR);
766 /* TODO(3.0): Remove legacy code below */
769 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
770 ret = ctx->cipher->do_cipher(ctx, out, NULL, 0);
778 b = ctx->cipher->block_size;
779 OPENSSL_assert(b <= sizeof(ctx->buf));
785 if (ctx->flags & EVP_CIPH_NO_PADDING) {
787 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,
788 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
796 for (i = bl; i < b; i++)
798 ret = ctx->cipher->do_cipher(ctx, out, ctx->buf, b);
806 int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
807 const unsigned char *in, int inl)
809 int fix_len, cmpl = inl, ret;
814 /* Prevent accidental use of encryption context when decrypting */
816 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_INVALID_OPERATION);
820 if (ctx->cipher == NULL) {
821 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_NO_CIPHER_SET);
824 if (ctx->cipher->prov == NULL)
827 blocksize = EVP_CIPHER_CTX_block_size(ctx);
829 if (ctx->cipher->cupdate == NULL || blocksize < 1) {
830 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR);
833 ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl,
834 inl + (blocksize == 1 ? 0 : blocksize), in,
838 if (soutl > INT_MAX) {
839 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR);
847 /* TODO(3.0): Remove legacy code below */
850 b = ctx->cipher->block_size;
852 if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
853 cmpl = (cmpl + 7) / 8;
855 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
856 if (b == 1 && is_partially_overlapping(out, in, cmpl)) {
857 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
861 fix_len = ctx->cipher->do_cipher(ctx, out, in, inl);
875 if (ctx->flags & EVP_CIPH_NO_PADDING)
876 return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl);
878 OPENSSL_assert(b <= sizeof(ctx->final));
880 if (ctx->final_used) {
881 /* see comment about PTRDIFF_T comparison above */
882 if (((PTRDIFF_T)out == (PTRDIFF_T)in)
883 || is_partially_overlapping(out, in, b)) {
884 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
887 memcpy(out, ctx->final, b);
893 if (!evp_EncryptDecryptUpdate(ctx, out, outl, in, inl))
897 * if we have 'decrypted' a multiple of block size, make sure we have a
898 * copy of this last block
900 if (b > 1 && !ctx->buf_len) {
903 memcpy(ctx->final, &out[*outl], b);
913 int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
916 ret = EVP_DecryptFinal_ex(ctx, out, outl);
920 int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
928 /* Prevent accidental use of encryption context when decrypting */
930 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_INVALID_OPERATION);
934 if (ctx->cipher == NULL) {
935 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_NO_CIPHER_SET);
939 if (ctx->cipher->prov == NULL)
942 blocksize = EVP_CIPHER_CTX_block_size(ctx);
944 if (blocksize < 1 || ctx->cipher->cfinal == NULL) {
945 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR);
949 ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl,
950 blocksize == 1 ? 0 : blocksize);
953 if (soutl > INT_MAX) {
954 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR);
962 /* TODO(3.0): Remove legacy code below */
966 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
967 i = ctx->cipher->do_cipher(ctx, out, NULL, 0);
975 b = ctx->cipher->block_size;
976 if (ctx->flags & EVP_CIPH_NO_PADDING) {
978 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,
979 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
986 if (ctx->buf_len || !ctx->final_used) {
987 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_WRONG_FINAL_BLOCK_LENGTH);
990 OPENSSL_assert(b <= sizeof(ctx->final));
993 * The following assumes that the ciphertext has been authenticated.
994 * Otherwise it provides a padding oracle.
996 n = ctx->final[b - 1];
997 if (n == 0 || n > (int)b) {
998 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
1001 for (i = 0; i < n; i++) {
1002 if (ctx->final[--b] != n) {
1003 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
1007 n = ctx->cipher->block_size - n;
1008 for (i = 0; i < n; i++)
1009 out[i] = ctx->final[i];
1016 int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
1019 OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
1020 size_t len = keylen;
1022 params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_KEYLEN, &len);
1023 ok = evp_do_ciph_ctx_setparams(c->cipher, c->provctx, params);
1025 if (ok != EVP_CTRL_RET_UNSUPPORTED)
1028 /* TODO(3.0) legacy code follows */
1029 if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
1030 return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
1031 if (EVP_CIPHER_CTX_key_length(c) == keylen)
1033 if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) {
1034 c->key_len = keylen;
1037 EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH, EVP_R_INVALID_KEY_LENGTH);
1041 int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
1044 OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
1045 unsigned int pd = pad;
1048 ctx->flags &= ~EVP_CIPH_NO_PADDING;
1050 ctx->flags |= EVP_CIPH_NO_PADDING;
1052 params[0] = OSSL_PARAM_construct_uint(OSSL_CIPHER_PARAM_PADDING, &pd);
1053 ok = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1058 int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
1060 int ret = EVP_CTRL_RET_UNSUPPORTED;
1064 OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
1066 if (ctx == NULL || ctx->cipher == NULL) {
1067 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
1071 if (ctx->cipher->prov == NULL)
1075 case EVP_CTRL_SET_KEY_LENGTH:
1076 params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_KEYLEN, &sz);
1078 case EVP_CTRL_RAND_KEY: /* Used by DES */
1081 OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_RANDOM_KEY,
1085 case EVP_CTRL_SET_PIPELINE_OUTPUT_BUFS: /* Used by DASYNC */
1086 case EVP_CTRL_INIT: /* TODO(3.0) Purely legacy, no provider counterpart */
1088 return EVP_CTRL_RET_UNSUPPORTED;
1089 case EVP_CTRL_GET_IV:
1091 params[0] = OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_IV,
1094 case EVP_CTRL_AEAD_SET_IVLEN:
1097 params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_IVLEN, &sz);
1099 case EVP_CTRL_GCM_SET_IV_FIXED:
1101 OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TLS1_IV_FIXED,
1104 case EVP_CTRL_GET_RC5_ROUNDS:
1105 set_params = 0; /* Fall thru */
1106 case EVP_CTRL_SET_RC5_ROUNDS:
1109 i = (unsigned int)arg;
1110 params[0] = OSSL_PARAM_construct_uint(OSSL_CIPHER_PARAM_ROUNDS, &i);
1112 case EVP_CTRL_AEAD_GET_TAG:
1113 set_params = 0; /* Fall thru */
1114 case EVP_CTRL_AEAD_SET_TAG:
1115 params[0] = OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TAG,
1118 case EVP_CTRL_AEAD_TLS1_AAD:
1119 /* This one does a set and a get - since it returns a padding size */
1121 OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TLS1_AAD,
1123 ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1127 OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_AEAD_TLS1_AAD_PAD, &sz);
1128 ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
1135 ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1137 ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
1140 /* TODO(3.0): Remove legacy code below */
1142 if (ctx->cipher->ctrl == NULL) {
1143 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
1147 ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
1150 if (ret == EVP_CTRL_RET_UNSUPPORTED) {
1151 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL,
1152 EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
1158 int EVP_CIPHER_get_params(EVP_CIPHER *cipher, OSSL_PARAM params[])
1160 if (cipher != NULL && cipher->get_params != NULL)
1161 return cipher->get_params(params);
1165 int EVP_CIPHER_CTX_set_params(EVP_CIPHER_CTX *ctx, const OSSL_PARAM params[])
1167 if (ctx->cipher != NULL && ctx->cipher->set_ctx_params != NULL)
1168 return ctx->cipher->set_ctx_params(ctx->provctx, params);
1172 int EVP_CIPHER_CTX_get_params(EVP_CIPHER_CTX *ctx, OSSL_PARAM params[])
1174 if (ctx->cipher != NULL && ctx->cipher->get_ctx_params != NULL)
1175 return ctx->cipher->get_ctx_params(ctx->provctx, params);
1179 const OSSL_PARAM *EVP_CIPHER_gettable_params(const EVP_CIPHER *cipher)
1181 if (cipher != NULL && cipher->gettable_params != NULL)
1182 return cipher->gettable_params();
1186 const OSSL_PARAM *EVP_CIPHER_settable_ctx_params(const EVP_CIPHER *cipher)
1188 if (cipher != NULL && cipher->settable_ctx_params != NULL)
1189 return cipher->settable_ctx_params();
1193 const OSSL_PARAM *EVP_CIPHER_gettable_ctx_params(const EVP_CIPHER *cipher)
1195 if (cipher != NULL && cipher->gettable_ctx_params != NULL)
1196 return cipher->gettable_ctx_params();
1200 int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key)
1202 if (ctx->cipher->flags & EVP_CIPH_RAND_KEY)
1203 return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key);
1211 kl = EVP_CIPHER_CTX_key_length(ctx);
1212 if (kl <= 0 || RAND_priv_bytes(key, kl) <= 0)
1216 #endif /* FIPS_MODE */
1219 int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in)
1221 if ((in == NULL) || (in->cipher == NULL)) {
1222 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INPUT_NOT_INITIALIZED);
1226 if (in->cipher->prov == NULL)
1229 if (in->cipher->dupctx == NULL) {
1230 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX);
1234 EVP_CIPHER_CTX_reset(out);
1237 out->provctx = NULL;
1239 if (in->fetched_cipher != NULL && !EVP_CIPHER_up_ref(in->fetched_cipher)) {
1240 out->fetched_cipher = NULL;
1244 out->provctx = in->cipher->dupctx(in->provctx);
1245 if (out->provctx == NULL) {
1246 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX);
1252 /* TODO(3.0): Remove legacy code below */
1255 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
1256 /* Make sure it's safe to copy a cipher context using an ENGINE */
1257 if (in->engine && !ENGINE_init(in->engine)) {
1258 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_ENGINE_LIB);
1263 EVP_CIPHER_CTX_reset(out);
1264 memcpy(out, in, sizeof(*out));
1266 if (in->cipher_data && in->cipher->ctx_size) {
1267 out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size);
1268 if (out->cipher_data == NULL) {
1270 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_MALLOC_FAILURE);
1273 memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size);
1276 if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY)
1277 if (!in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out)) {
1279 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INITIALIZATION_ERROR);
1285 EVP_CIPHER *evp_cipher_new(void)
1287 EVP_CIPHER *cipher = OPENSSL_zalloc(sizeof(EVP_CIPHER));
1289 if (cipher != NULL) {
1290 cipher->lock = CRYPTO_THREAD_lock_new();
1291 if (cipher->lock == NULL) {
1292 OPENSSL_free(cipher);
1301 * FIPS module note: since internal fetches will be entirely
1302 * provider based, we know that none of its code depends on legacy
1303 * NIDs or any functionality that use them.
1306 /* TODO(3.x) get rid of the need for legacy NIDs */
1307 static void set_legacy_nid(const char *name, void *vlegacy_nid)
1310 int *legacy_nid = vlegacy_nid;
1312 if (*legacy_nid == -1) /* We found a clash already */
1314 if ((nid = OBJ_sn2nid(name)) == NID_undef
1315 && (nid = OBJ_ln2nid(name)) == NID_undef)
1317 if (*legacy_nid != NID_undef && *legacy_nid != nid) {
1325 static void *evp_cipher_from_dispatch(const int name_id,
1326 const OSSL_DISPATCH *fns,
1327 OSSL_PROVIDER *prov,
1330 EVP_CIPHER *cipher = NULL;
1331 int fnciphcnt = 0, fnctxcnt = 0;
1333 if ((cipher = evp_cipher_new()) == NULL) {
1334 EVPerr(0, ERR_R_MALLOC_FAILURE);
1339 /* TODO(3.x) get rid of the need for legacy NIDs */
1340 cipher->nid = NID_undef;
1341 evp_doall_names(prov, name_id, set_legacy_nid, &cipher->nid);
1342 if (cipher->nid == -1) {
1343 ERR_raise(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR);
1344 EVP_CIPHER_free(cipher);
1349 cipher->name_id = name_id;
1351 for (; fns->function_id != 0; fns++) {
1352 switch (fns->function_id) {
1353 case OSSL_FUNC_CIPHER_NEWCTX:
1354 if (cipher->newctx != NULL)
1356 cipher->newctx = OSSL_get_OP_cipher_newctx(fns);
1359 case OSSL_FUNC_CIPHER_ENCRYPT_INIT:
1360 if (cipher->einit != NULL)
1362 cipher->einit = OSSL_get_OP_cipher_encrypt_init(fns);
1365 case OSSL_FUNC_CIPHER_DECRYPT_INIT:
1366 if (cipher->dinit != NULL)
1368 cipher->dinit = OSSL_get_OP_cipher_decrypt_init(fns);
1371 case OSSL_FUNC_CIPHER_UPDATE:
1372 if (cipher->cupdate != NULL)
1374 cipher->cupdate = OSSL_get_OP_cipher_update(fns);
1377 case OSSL_FUNC_CIPHER_FINAL:
1378 if (cipher->cfinal != NULL)
1380 cipher->cfinal = OSSL_get_OP_cipher_final(fns);
1383 case OSSL_FUNC_CIPHER_CIPHER:
1384 if (cipher->ccipher != NULL)
1386 cipher->ccipher = OSSL_get_OP_cipher_cipher(fns);
1388 case OSSL_FUNC_CIPHER_FREECTX:
1389 if (cipher->freectx != NULL)
1391 cipher->freectx = OSSL_get_OP_cipher_freectx(fns);
1394 case OSSL_FUNC_CIPHER_DUPCTX:
1395 if (cipher->dupctx != NULL)
1397 cipher->dupctx = OSSL_get_OP_cipher_dupctx(fns);
1399 case OSSL_FUNC_CIPHER_GET_PARAMS:
1400 if (cipher->get_params != NULL)
1402 cipher->get_params = OSSL_get_OP_cipher_get_params(fns);
1404 case OSSL_FUNC_CIPHER_GET_CTX_PARAMS:
1405 if (cipher->get_ctx_params != NULL)
1407 cipher->get_ctx_params = OSSL_get_OP_cipher_get_ctx_params(fns);
1409 case OSSL_FUNC_CIPHER_SET_CTX_PARAMS:
1410 if (cipher->set_ctx_params != NULL)
1412 cipher->set_ctx_params = OSSL_get_OP_cipher_set_ctx_params(fns);
1414 case OSSL_FUNC_CIPHER_GETTABLE_PARAMS:
1415 if (cipher->gettable_params != NULL)
1417 cipher->gettable_params = OSSL_get_OP_cipher_gettable_params(fns);
1419 case OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS:
1420 if (cipher->gettable_ctx_params != NULL)
1422 cipher->gettable_ctx_params =
1423 OSSL_get_OP_cipher_gettable_ctx_params(fns);
1425 case OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS:
1426 if (cipher->settable_ctx_params != NULL)
1428 cipher->settable_ctx_params =
1429 OSSL_get_OP_cipher_settable_ctx_params(fns);
1433 if ((fnciphcnt != 0 && fnciphcnt != 3 && fnciphcnt != 4)
1434 || (fnciphcnt == 0 && cipher->ccipher == NULL)
1437 * In order to be a consistent set of functions we must have at least
1438 * a complete set of "encrypt" functions, or a complete set of "decrypt"
1439 * functions, or a single "cipher" function. In all cases we need both
1440 * the "newctx" and "freectx" functions.
1442 EVP_CIPHER_free(cipher);
1443 EVPerr(EVP_F_EVP_CIPHER_FROM_DISPATCH, EVP_R_INVALID_PROVIDER_FUNCTIONS);
1446 cipher->prov = prov;
1448 ossl_provider_up_ref(prov);
1453 static int evp_cipher_up_ref(void *cipher)
1455 return EVP_CIPHER_up_ref(cipher);
1458 static void evp_cipher_free(void *cipher)
1460 EVP_CIPHER_free(cipher);
1463 EVP_CIPHER *EVP_CIPHER_fetch(OPENSSL_CTX *ctx, const char *algorithm,
1464 const char *properties)
1466 EVP_CIPHER *cipher =
1467 evp_generic_fetch(ctx, OSSL_OP_CIPHER, algorithm, properties,
1468 evp_cipher_from_dispatch, NULL, evp_cipher_up_ref,
1474 int EVP_CIPHER_up_ref(EVP_CIPHER *cipher)
1478 CRYPTO_UP_REF(&cipher->refcnt, &ref, cipher->lock);
1482 void EVP_CIPHER_free(EVP_CIPHER *cipher)
1489 CRYPTO_DOWN_REF(&cipher->refcnt, &i, cipher->lock);
1492 ossl_provider_free(cipher->prov);
1493 CRYPTO_THREAD_lock_free(cipher->lock);
1494 OPENSSL_free(cipher);
1497 void EVP_CIPHER_do_all_ex(OPENSSL_CTX *libctx,
1498 void (*fn)(EVP_CIPHER *mac, void *arg),
1501 evp_generic_do_all(libctx, OSSL_OP_CIPHER,
1502 (void (*)(void *, void *))fn, arg,
1503 evp_cipher_from_dispatch, NULL, evp_cipher_free);