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_aes_256_siv:
175 case NID_aes_192_siv:
176 case NID_aes_128_siv:
177 case NID_id_aes256_wrap:
178 case NID_id_aes256_wrap_pad:
179 case NID_id_aes192_wrap:
180 case NID_id_aes192_wrap_pad:
181 case NID_id_aes128_wrap:
182 case NID_id_aes128_wrap_pad:
183 case NID_aria_256_gcm:
184 case NID_aria_192_gcm:
185 case NID_aria_128_gcm:
186 case NID_aes_256_ccm:
187 case NID_aes_192_ccm:
188 case NID_aes_128_ccm:
189 case NID_aria_256_ccm:
190 case NID_aria_192_ccm:
191 case NID_aria_128_ccm:
192 case NID_aria_256_ecb:
193 case NID_aria_192_ecb:
194 case NID_aria_128_ecb:
195 case NID_aria_256_cbc:
196 case NID_aria_192_cbc:
197 case NID_aria_128_cbc:
198 case NID_aria_256_ofb128:
199 case NID_aria_192_ofb128:
200 case NID_aria_128_ofb128:
201 case NID_aria_256_cfb128:
202 case NID_aria_192_cfb128:
203 case NID_aria_128_cfb128:
204 case NID_aria_256_cfb1:
205 case NID_aria_192_cfb1:
206 case NID_aria_128_cfb1:
207 case NID_aria_256_cfb8:
208 case NID_aria_192_cfb8:
209 case NID_aria_128_cfb8:
210 case NID_aria_256_ctr:
211 case NID_aria_192_ctr:
212 case NID_aria_128_ctr:
213 case NID_camellia_256_ecb:
214 case NID_camellia_192_ecb:
215 case NID_camellia_128_ecb:
216 case NID_camellia_256_cbc:
217 case NID_camellia_192_cbc:
218 case NID_camellia_128_cbc:
219 case NID_camellia_256_ofb128:
220 case NID_camellia_192_ofb128:
221 case NID_camellia_128_ofb128:
222 case NID_camellia_256_cfb128:
223 case NID_camellia_192_cfb128:
224 case NID_camellia_128_cfb128:
225 case NID_camellia_256_cfb1:
226 case NID_camellia_192_cfb1:
227 case NID_camellia_128_cfb1:
228 case NID_camellia_256_cfb8:
229 case NID_camellia_192_cfb8:
230 case NID_camellia_128_cfb8:
231 case NID_camellia_256_ctr:
232 case NID_camellia_192_ctr:
233 case NID_camellia_128_ctr:
234 case NID_des_ede3_cbc:
235 case NID_des_ede3_ecb:
236 case NID_des_ede3_ofb64:
237 case NID_des_ede3_cfb64:
238 case NID_des_ede3_cfb8:
239 case NID_des_ede3_cfb1:
240 case NID_des_ede_cbc:
241 case NID_des_ede_ecb:
242 case NID_des_ede_ofb64:
243 case NID_des_ede_cfb64:
251 case NID_id_smime_alg_CMS3DESwrap:
262 case NID_cast5_cfb64:
263 case NID_cast5_ofb64:
266 case NID_seed_cfb128:
267 case NID_seed_ofb128:
285 case NID_chacha20_poly1305:
293 * Ensure a context left lying around from last time is cleared
296 if (cipher != NULL && ctx->cipher != NULL) {
297 OPENSSL_clear_free(ctx->cipher_data, ctx->cipher->ctx_size);
298 ctx->cipher_data = NULL;
302 /* TODO(3.0): Start of non-legacy code below */
304 /* Ensure a context left lying around from last time is cleared */
305 if (cipher != NULL && ctx->cipher != NULL) {
306 unsigned long flags = ctx->flags;
308 EVP_CIPHER_CTX_reset(ctx);
309 /* Restore encrypt and flags */
315 cipher = ctx->cipher;
317 if (cipher->prov == NULL) {
319 /* We only do explict fetches inside the FIPS module */
320 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
323 EVP_CIPHER *provciph =
324 EVP_CIPHER_fetch(NULL, OBJ_nid2sn(cipher->nid), "");
326 if (provciph == NULL) {
327 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
331 EVP_CIPHER_free(ctx->fetched_cipher);
332 ctx->fetched_cipher = provciph;
336 ctx->cipher = cipher;
337 if (ctx->provctx == NULL) {
338 ctx->provctx = ctx->cipher->newctx(ossl_provider_ctx(cipher->prov));
339 if (ctx->provctx == NULL) {
340 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
345 if ((ctx->flags & EVP_CIPH_NO_PADDING) != 0) {
347 * If this ctx was already set up for no padding then we need to tell
348 * the new cipher about it.
350 if (!EVP_CIPHER_CTX_set_padding(ctx, 0))
355 if (ctx->cipher->einit == NULL) {
356 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
360 return ctx->cipher->einit(ctx->provctx,
363 : EVP_CIPHER_CTX_key_length(ctx),
366 : EVP_CIPHER_CTX_iv_length(ctx));
369 if (ctx->cipher->dinit == NULL) {
370 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
374 return ctx->cipher->dinit(ctx->provctx,
377 : EVP_CIPHER_CTX_key_length(ctx),
380 : EVP_CIPHER_CTX_iv_length(ctx));
382 /* TODO(3.0): Remove legacy code below */
385 if (cipher != NULL) {
387 * Ensure a context left lying around from last time is cleared (we
388 * previously attempted to avoid this if the same ENGINE and
389 * EVP_CIPHER could be used).
392 unsigned long flags = ctx->flags;
393 EVP_CIPHER_CTX_reset(ctx);
394 /* Restore encrypt and flags */
398 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
400 if (!ENGINE_init(impl)) {
401 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
408 /* There's an ENGINE for this job ... (apparently) */
409 const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid);
413 * One positive side-effect of US's export control history,
414 * is that we should at least be able to avoid using US
415 * misspellings of "initialisation"?
417 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
420 /* We'll use the ENGINE's private cipher definition */
423 * Store the ENGINE functional reference so we know 'cipher' came
424 * from an ENGINE and we need to release it when done.
432 ctx->cipher = cipher;
433 if (ctx->cipher->ctx_size) {
434 ctx->cipher_data = OPENSSL_zalloc(ctx->cipher->ctx_size);
435 if (ctx->cipher_data == NULL) {
437 EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE);
441 ctx->cipher_data = NULL;
443 ctx->key_len = cipher->key_len;
444 /* Preserve wrap enable flag, zero everything else */
445 ctx->flags &= EVP_CIPHER_CTX_FLAG_WRAP_ALLOW;
446 if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) {
447 if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) {
449 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
454 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
457 if (ctx->cipher == NULL)
460 /* we assume block size is a power of 2 in *cryptUpdate */
461 OPENSSL_assert(ctx->cipher->block_size == 1
462 || ctx->cipher->block_size == 8
463 || ctx->cipher->block_size == 16);
465 if (!(ctx->flags & EVP_CIPHER_CTX_FLAG_WRAP_ALLOW)
466 && EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_WRAP_MODE) {
467 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_WRAP_MODE_NOT_ALLOWED);
471 if (!(EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(ctx)) & EVP_CIPH_CUSTOM_IV)) {
472 switch (EVP_CIPHER_CTX_mode(ctx)) {
474 case EVP_CIPH_STREAM_CIPHER:
475 case EVP_CIPH_ECB_MODE:
478 case EVP_CIPH_CFB_MODE:
479 case EVP_CIPH_OFB_MODE:
484 case EVP_CIPH_CBC_MODE:
486 OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <=
487 (int)sizeof(ctx->iv));
489 memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
490 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
493 case EVP_CIPH_CTR_MODE:
495 /* Don't reuse IV for CTR mode */
497 memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx));
505 if (key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
506 if (!ctx->cipher->init(ctx, key, iv, enc))
511 ctx->block_mask = ctx->cipher->block_size - 1;
515 int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
516 const unsigned char *in, int inl)
519 return EVP_EncryptUpdate(ctx, out, outl, in, inl);
521 return EVP_DecryptUpdate(ctx, out, outl, in, inl);
524 int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
527 return EVP_EncryptFinal_ex(ctx, out, outl);
529 return EVP_DecryptFinal_ex(ctx, out, outl);
532 int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
535 return EVP_EncryptFinal(ctx, out, outl);
537 return EVP_DecryptFinal(ctx, out, outl);
540 int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
541 const unsigned char *key, const unsigned char *iv)
543 return EVP_CipherInit(ctx, cipher, key, iv, 1);
546 int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
547 ENGINE *impl, const unsigned char *key,
548 const unsigned char *iv)
550 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
553 int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
554 const unsigned char *key, const unsigned char *iv)
556 return EVP_CipherInit(ctx, cipher, key, iv, 0);
559 int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
560 ENGINE *impl, const unsigned char *key,
561 const unsigned char *iv)
563 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
567 * According to the letter of standard difference between pointers
568 * is specified to be valid only within same object. This makes
569 * it formally challenging to determine if input and output buffers
570 * are not partially overlapping with standard pointer arithmetic.
575 #if defined(OPENSSL_SYS_VMS) && __INITIAL_POINTER_SIZE==64
577 * Then we have VMS that distinguishes itself by adhering to
578 * sizeof(size_t)==4 even in 64-bit builds, which means that
579 * difference between two pointers might be truncated to 32 bits.
580 * In the context one can even wonder how comparison for
581 * equality is implemented. To be on the safe side we adhere to
582 * PTRDIFF_T even for comparison for equality.
584 # define PTRDIFF_T uint64_t
586 # define PTRDIFF_T size_t
589 int is_partially_overlapping(const void *ptr1, const void *ptr2, int len)
591 PTRDIFF_T diff = (PTRDIFF_T)ptr1-(PTRDIFF_T)ptr2;
593 * Check for partially overlapping buffers. [Binary logical
594 * operations are used instead of boolean to minimize number
595 * of conditional branches.]
597 int overlapped = (len > 0) & (diff != 0) & ((diff < (PTRDIFF_T)len) |
598 (diff > (0 - (PTRDIFF_T)len)));
603 static int evp_EncryptDecryptUpdate(EVP_CIPHER_CTX *ctx,
604 unsigned char *out, int *outl,
605 const unsigned char *in, int inl)
607 int i, j, bl, cmpl = inl;
609 if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
610 cmpl = (cmpl + 7) / 8;
612 bl = ctx->cipher->block_size;
614 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
615 /* If block size > 1 then the cipher will have to do this check */
616 if (bl == 1 && is_partially_overlapping(out, in, cmpl)) {
617 EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
621 i = ctx->cipher->do_cipher(ctx, out, in, inl);
633 if (is_partially_overlapping(out + ctx->buf_len, in, cmpl)) {
634 EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
638 if (ctx->buf_len == 0 && (inl & (ctx->block_mask)) == 0) {
639 if (ctx->cipher->do_cipher(ctx, out, in, inl)) {
648 OPENSSL_assert(bl <= (int)sizeof(ctx->buf));
651 memcpy(&(ctx->buf[i]), in, inl);
657 memcpy(&(ctx->buf[i]), in, j);
660 if (!ctx->cipher->do_cipher(ctx, out, ctx->buf, bl))
670 if (!ctx->cipher->do_cipher(ctx, out, in, inl))
676 memcpy(ctx->buf, &(in[inl]), i);
682 int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
683 const unsigned char *in, int inl)
689 /* Prevent accidental use of decryption context when encrypting */
691 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_INVALID_OPERATION);
695 if (ctx->cipher == NULL) {
696 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_NO_CIPHER_SET);
700 if (ctx->cipher->prov == NULL)
703 blocksize = EVP_CIPHER_CTX_block_size(ctx);
705 if (ctx->cipher->cupdate == NULL || blocksize < 1) {
706 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR);
709 ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl,
710 inl + (blocksize == 1 ? 0 : blocksize), in,
714 if (soutl > INT_MAX) {
715 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR);
723 /* TODO(3.0): Remove legacy code below */
726 return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl);
729 int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
732 ret = EVP_EncryptFinal_ex(ctx, out, outl);
736 int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
739 unsigned int i, b, bl;
743 /* Prevent accidental use of decryption context when encrypting */
745 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_INVALID_OPERATION);
749 if (ctx->cipher == NULL) {
750 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_NO_CIPHER_SET);
753 if (ctx->cipher->prov == NULL)
756 blocksize = EVP_CIPHER_CTX_block_size(ctx);
758 if (blocksize < 1 || ctx->cipher->cfinal == NULL) {
759 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR);
763 ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl,
764 blocksize == 1 ? 0 : blocksize);
767 if (soutl > INT_MAX) {
768 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR);
776 /* TODO(3.0): Remove legacy code below */
779 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
780 ret = ctx->cipher->do_cipher(ctx, out, NULL, 0);
788 b = ctx->cipher->block_size;
789 OPENSSL_assert(b <= sizeof(ctx->buf));
795 if (ctx->flags & EVP_CIPH_NO_PADDING) {
797 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,
798 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
806 for (i = bl; i < b; i++)
808 ret = ctx->cipher->do_cipher(ctx, out, ctx->buf, b);
816 int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
817 const unsigned char *in, int inl)
819 int fix_len, cmpl = inl, ret;
824 /* Prevent accidental use of encryption context when decrypting */
826 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_INVALID_OPERATION);
830 if (ctx->cipher == NULL) {
831 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_NO_CIPHER_SET);
834 if (ctx->cipher->prov == NULL)
837 blocksize = EVP_CIPHER_CTX_block_size(ctx);
839 if (ctx->cipher->cupdate == NULL || blocksize < 1) {
840 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR);
843 ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl,
844 inl + (blocksize == 1 ? 0 : blocksize), in,
848 if (soutl > INT_MAX) {
849 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR);
857 /* TODO(3.0): Remove legacy code below */
860 b = ctx->cipher->block_size;
862 if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
863 cmpl = (cmpl + 7) / 8;
865 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
866 if (b == 1 && is_partially_overlapping(out, in, cmpl)) {
867 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
871 fix_len = ctx->cipher->do_cipher(ctx, out, in, inl);
885 if (ctx->flags & EVP_CIPH_NO_PADDING)
886 return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl);
888 OPENSSL_assert(b <= sizeof(ctx->final));
890 if (ctx->final_used) {
891 /* see comment about PTRDIFF_T comparison above */
892 if (((PTRDIFF_T)out == (PTRDIFF_T)in)
893 || is_partially_overlapping(out, in, b)) {
894 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
897 memcpy(out, ctx->final, b);
903 if (!evp_EncryptDecryptUpdate(ctx, out, outl, in, inl))
907 * if we have 'decrypted' a multiple of block size, make sure we have a
908 * copy of this last block
910 if (b > 1 && !ctx->buf_len) {
913 memcpy(ctx->final, &out[*outl], b);
923 int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
926 ret = EVP_DecryptFinal_ex(ctx, out, outl);
930 int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
938 /* Prevent accidental use of encryption context when decrypting */
940 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_INVALID_OPERATION);
944 if (ctx->cipher == NULL) {
945 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_NO_CIPHER_SET);
949 if (ctx->cipher->prov == NULL)
952 blocksize = EVP_CIPHER_CTX_block_size(ctx);
954 if (blocksize < 1 || ctx->cipher->cfinal == NULL) {
955 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR);
959 ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl,
960 blocksize == 1 ? 0 : blocksize);
963 if (soutl > INT_MAX) {
964 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR);
972 /* TODO(3.0): Remove legacy code below */
976 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
977 i = ctx->cipher->do_cipher(ctx, out, NULL, 0);
985 b = ctx->cipher->block_size;
986 if (ctx->flags & EVP_CIPH_NO_PADDING) {
988 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,
989 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
996 if (ctx->buf_len || !ctx->final_used) {
997 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_WRONG_FINAL_BLOCK_LENGTH);
1000 OPENSSL_assert(b <= sizeof(ctx->final));
1003 * The following assumes that the ciphertext has been authenticated.
1004 * Otherwise it provides a padding oracle.
1006 n = ctx->final[b - 1];
1007 if (n == 0 || n > (int)b) {
1008 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
1011 for (i = 0; i < n; i++) {
1012 if (ctx->final[--b] != n) {
1013 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
1017 n = ctx->cipher->block_size - n;
1018 for (i = 0; i < n; i++)
1019 out[i] = ctx->final[i];
1026 int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
1029 OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
1030 size_t len = keylen;
1032 params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_KEYLEN, &len);
1033 ok = evp_do_ciph_ctx_setparams(c->cipher, c->provctx, params);
1035 if (ok != EVP_CTRL_RET_UNSUPPORTED)
1038 /* TODO(3.0) legacy code follows */
1039 if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
1040 return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
1041 if (EVP_CIPHER_CTX_key_length(c) == keylen)
1043 if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) {
1044 c->key_len = keylen;
1047 EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH, EVP_R_INVALID_KEY_LENGTH);
1051 int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
1054 OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
1055 unsigned int pd = pad;
1058 ctx->flags &= ~EVP_CIPH_NO_PADDING;
1060 ctx->flags |= EVP_CIPH_NO_PADDING;
1062 params[0] = OSSL_PARAM_construct_uint(OSSL_CIPHER_PARAM_PADDING, &pd);
1063 ok = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1068 int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
1070 int ret = EVP_CTRL_RET_UNSUPPORTED;
1074 OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
1076 if (ctx == NULL || ctx->cipher == NULL) {
1077 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
1081 if (ctx->cipher->prov == NULL)
1085 case EVP_CTRL_SET_KEY_LENGTH:
1086 params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_KEYLEN, &sz);
1088 case EVP_CTRL_RAND_KEY: /* Used by DES */
1091 OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_RANDOM_KEY,
1097 * TODO(3.0) EVP_CTRL_INIT is purely legacy, no provider counterpart
1098 * As a matter of fact, this should be dead code, but some caller
1099 * might still do a direct control call with this command, so...
1100 * Legacy methods return 1 except for exceptional circumstances, so
1101 * we do the same here to not be disruptive.
1104 case EVP_CTRL_SET_PIPELINE_OUTPUT_BUFS: /* Used by DASYNC */
1107 case EVP_CTRL_GET_IV:
1109 params[0] = OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_IV,
1112 case EVP_CTRL_AEAD_SET_IVLEN:
1115 params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_IVLEN, &sz);
1117 case EVP_CTRL_GCM_SET_IV_FIXED:
1119 OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TLS1_IV_FIXED,
1122 case EVP_CTRL_GET_RC5_ROUNDS:
1123 set_params = 0; /* Fall thru */
1124 case EVP_CTRL_SET_RC5_ROUNDS:
1127 i = (unsigned int)arg;
1128 params[0] = OSSL_PARAM_construct_uint(OSSL_CIPHER_PARAM_ROUNDS, &i);
1130 case EVP_CTRL_SET_SPEED:
1133 i = (unsigned int)arg;
1134 params[0] = OSSL_PARAM_construct_uint(OSSL_CIPHER_PARAM_SPEED, &i);
1136 case EVP_CTRL_AEAD_GET_TAG:
1137 set_params = 0; /* Fall thru */
1138 case EVP_CTRL_AEAD_SET_TAG:
1139 params[0] = OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TAG,
1142 case EVP_CTRL_AEAD_SET_MAC_KEY:
1144 OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_MAC_KEY,
1147 case EVP_CTRL_AEAD_TLS1_AAD:
1148 /* This one does a set and a get - since it returns a padding size */
1150 OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TLS1_AAD,
1152 ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1156 OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_AEAD_TLS1_AAD_PAD, &sz);
1157 ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
1161 #ifndef OPENSSL_NO_RC2
1162 case EVP_CTRL_GET_RC2_KEY_BITS:
1163 set_params = 0; /* Fall thru */
1164 case EVP_CTRL_SET_RC2_KEY_BITS:
1165 params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_RC2_KEYBITS, &sz);
1167 #endif /* OPENSSL_NO_RC2 */
1171 ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1173 ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
1176 /* TODO(3.0): Remove legacy code below */
1178 if (ctx->cipher->ctrl == NULL) {
1179 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
1183 ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
1186 if (ret == EVP_CTRL_RET_UNSUPPORTED) {
1187 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL,
1188 EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
1194 int EVP_CIPHER_get_params(EVP_CIPHER *cipher, OSSL_PARAM params[])
1196 if (cipher != NULL && cipher->get_params != NULL)
1197 return cipher->get_params(params);
1201 int EVP_CIPHER_CTX_set_params(EVP_CIPHER_CTX *ctx, const OSSL_PARAM params[])
1203 if (ctx->cipher != NULL && ctx->cipher->set_ctx_params != NULL)
1204 return ctx->cipher->set_ctx_params(ctx->provctx, params);
1208 int EVP_CIPHER_CTX_get_params(EVP_CIPHER_CTX *ctx, OSSL_PARAM params[])
1210 if (ctx->cipher != NULL && ctx->cipher->get_ctx_params != NULL)
1211 return ctx->cipher->get_ctx_params(ctx->provctx, params);
1215 const OSSL_PARAM *EVP_CIPHER_gettable_params(const EVP_CIPHER *cipher)
1217 if (cipher != NULL && cipher->gettable_params != NULL)
1218 return cipher->gettable_params();
1222 const OSSL_PARAM *EVP_CIPHER_settable_ctx_params(const EVP_CIPHER *cipher)
1224 if (cipher != NULL && cipher->settable_ctx_params != NULL)
1225 return cipher->settable_ctx_params();
1229 const OSSL_PARAM *EVP_CIPHER_gettable_ctx_params(const EVP_CIPHER *cipher)
1231 if (cipher != NULL && cipher->gettable_ctx_params != NULL)
1232 return cipher->gettable_ctx_params();
1236 int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key)
1238 if (ctx->cipher->flags & EVP_CIPH_RAND_KEY)
1239 return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key);
1247 kl = EVP_CIPHER_CTX_key_length(ctx);
1248 if (kl <= 0 || RAND_priv_bytes(key, kl) <= 0)
1252 #endif /* FIPS_MODE */
1255 int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in)
1257 if ((in == NULL) || (in->cipher == NULL)) {
1258 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INPUT_NOT_INITIALIZED);
1262 if (in->cipher->prov == NULL)
1265 if (in->cipher->dupctx == NULL) {
1266 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX);
1270 EVP_CIPHER_CTX_reset(out);
1273 out->provctx = NULL;
1275 if (in->fetched_cipher != NULL && !EVP_CIPHER_up_ref(in->fetched_cipher)) {
1276 out->fetched_cipher = NULL;
1280 out->provctx = in->cipher->dupctx(in->provctx);
1281 if (out->provctx == NULL) {
1282 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX);
1288 /* TODO(3.0): Remove legacy code below */
1291 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
1292 /* Make sure it's safe to copy a cipher context using an ENGINE */
1293 if (in->engine && !ENGINE_init(in->engine)) {
1294 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_ENGINE_LIB);
1299 EVP_CIPHER_CTX_reset(out);
1300 memcpy(out, in, sizeof(*out));
1302 if (in->cipher_data && in->cipher->ctx_size) {
1303 out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size);
1304 if (out->cipher_data == NULL) {
1306 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_MALLOC_FAILURE);
1309 memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size);
1312 if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY)
1313 if (!in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out)) {
1315 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INITIALIZATION_ERROR);
1321 EVP_CIPHER *evp_cipher_new(void)
1323 EVP_CIPHER *cipher = OPENSSL_zalloc(sizeof(EVP_CIPHER));
1325 if (cipher != NULL) {
1326 cipher->lock = CRYPTO_THREAD_lock_new();
1327 if (cipher->lock == NULL) {
1328 OPENSSL_free(cipher);
1337 * FIPS module note: since internal fetches will be entirely
1338 * provider based, we know that none of its code depends on legacy
1339 * NIDs or any functionality that use them.
1342 /* TODO(3.x) get rid of the need for legacy NIDs */
1343 static void set_legacy_nid(const char *name, void *vlegacy_nid)
1346 int *legacy_nid = vlegacy_nid;
1348 if (*legacy_nid == -1) /* We found a clash already */
1350 if ((nid = OBJ_sn2nid(name)) == NID_undef
1351 && (nid = OBJ_ln2nid(name)) == NID_undef)
1353 if (*legacy_nid != NID_undef && *legacy_nid != nid) {
1361 static void *evp_cipher_from_dispatch(const int name_id,
1362 const OSSL_DISPATCH *fns,
1363 OSSL_PROVIDER *prov,
1366 EVP_CIPHER *cipher = NULL;
1367 int fnciphcnt = 0, fnctxcnt = 0;
1369 if ((cipher = evp_cipher_new()) == NULL) {
1370 EVPerr(0, ERR_R_MALLOC_FAILURE);
1375 /* TODO(3.x) get rid of the need for legacy NIDs */
1376 cipher->nid = NID_undef;
1377 evp_names_do_all(prov, name_id, set_legacy_nid, &cipher->nid);
1378 if (cipher->nid == -1) {
1379 ERR_raise(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR);
1380 EVP_CIPHER_free(cipher);
1385 cipher->name_id = name_id;
1387 for (; fns->function_id != 0; fns++) {
1388 switch (fns->function_id) {
1389 case OSSL_FUNC_CIPHER_NEWCTX:
1390 if (cipher->newctx != NULL)
1392 cipher->newctx = OSSL_get_OP_cipher_newctx(fns);
1395 case OSSL_FUNC_CIPHER_ENCRYPT_INIT:
1396 if (cipher->einit != NULL)
1398 cipher->einit = OSSL_get_OP_cipher_encrypt_init(fns);
1401 case OSSL_FUNC_CIPHER_DECRYPT_INIT:
1402 if (cipher->dinit != NULL)
1404 cipher->dinit = OSSL_get_OP_cipher_decrypt_init(fns);
1407 case OSSL_FUNC_CIPHER_UPDATE:
1408 if (cipher->cupdate != NULL)
1410 cipher->cupdate = OSSL_get_OP_cipher_update(fns);
1413 case OSSL_FUNC_CIPHER_FINAL:
1414 if (cipher->cfinal != NULL)
1416 cipher->cfinal = OSSL_get_OP_cipher_final(fns);
1419 case OSSL_FUNC_CIPHER_CIPHER:
1420 if (cipher->ccipher != NULL)
1422 cipher->ccipher = OSSL_get_OP_cipher_cipher(fns);
1424 case OSSL_FUNC_CIPHER_FREECTX:
1425 if (cipher->freectx != NULL)
1427 cipher->freectx = OSSL_get_OP_cipher_freectx(fns);
1430 case OSSL_FUNC_CIPHER_DUPCTX:
1431 if (cipher->dupctx != NULL)
1433 cipher->dupctx = OSSL_get_OP_cipher_dupctx(fns);
1435 case OSSL_FUNC_CIPHER_GET_PARAMS:
1436 if (cipher->get_params != NULL)
1438 cipher->get_params = OSSL_get_OP_cipher_get_params(fns);
1440 case OSSL_FUNC_CIPHER_GET_CTX_PARAMS:
1441 if (cipher->get_ctx_params != NULL)
1443 cipher->get_ctx_params = OSSL_get_OP_cipher_get_ctx_params(fns);
1445 case OSSL_FUNC_CIPHER_SET_CTX_PARAMS:
1446 if (cipher->set_ctx_params != NULL)
1448 cipher->set_ctx_params = OSSL_get_OP_cipher_set_ctx_params(fns);
1450 case OSSL_FUNC_CIPHER_GETTABLE_PARAMS:
1451 if (cipher->gettable_params != NULL)
1453 cipher->gettable_params = OSSL_get_OP_cipher_gettable_params(fns);
1455 case OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS:
1456 if (cipher->gettable_ctx_params != NULL)
1458 cipher->gettable_ctx_params =
1459 OSSL_get_OP_cipher_gettable_ctx_params(fns);
1461 case OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS:
1462 if (cipher->settable_ctx_params != NULL)
1464 cipher->settable_ctx_params =
1465 OSSL_get_OP_cipher_settable_ctx_params(fns);
1469 if ((fnciphcnt != 0 && fnciphcnt != 3 && fnciphcnt != 4)
1470 || (fnciphcnt == 0 && cipher->ccipher == NULL)
1473 * In order to be a consistent set of functions we must have at least
1474 * a complete set of "encrypt" functions, or a complete set of "decrypt"
1475 * functions, or a single "cipher" function. In all cases we need both
1476 * the "newctx" and "freectx" functions.
1478 EVP_CIPHER_free(cipher);
1479 EVPerr(EVP_F_EVP_CIPHER_FROM_DISPATCH, EVP_R_INVALID_PROVIDER_FUNCTIONS);
1482 cipher->prov = prov;
1484 ossl_provider_up_ref(prov);
1489 static int evp_cipher_up_ref(void *cipher)
1491 return EVP_CIPHER_up_ref(cipher);
1494 static void evp_cipher_free(void *cipher)
1496 EVP_CIPHER_free(cipher);
1499 EVP_CIPHER *EVP_CIPHER_fetch(OPENSSL_CTX *ctx, const char *algorithm,
1500 const char *properties)
1502 EVP_CIPHER *cipher =
1503 evp_generic_fetch(ctx, OSSL_OP_CIPHER, algorithm, properties,
1504 evp_cipher_from_dispatch, NULL, evp_cipher_up_ref,
1510 int EVP_CIPHER_up_ref(EVP_CIPHER *cipher)
1514 CRYPTO_UP_REF(&cipher->refcnt, &ref, cipher->lock);
1518 void EVP_CIPHER_free(EVP_CIPHER *cipher)
1525 CRYPTO_DOWN_REF(&cipher->refcnt, &i, cipher->lock);
1528 ossl_provider_free(cipher->prov);
1529 CRYPTO_THREAD_lock_free(cipher->lock);
1530 OPENSSL_free(cipher);
1533 void EVP_CIPHER_do_all_provided(OPENSSL_CTX *libctx,
1534 void (*fn)(EVP_CIPHER *mac, void *arg),
1537 evp_generic_do_all(libctx, OSSL_OP_CIPHER,
1538 (void (*)(void *, void *))fn, arg,
1539 evp_cipher_from_dispatch, NULL, evp_cipher_free);