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:
288 * Ensure a context left lying around from last time is cleared
291 if (cipher != NULL && ctx->cipher != NULL) {
292 OPENSSL_clear_free(ctx->cipher_data, ctx->cipher->ctx_size);
293 ctx->cipher_data = NULL;
297 /* TODO(3.0): Start of non-legacy code below */
299 /* Ensure a context left lying around from last time is cleared */
300 if (cipher != NULL && ctx->cipher != NULL) {
301 unsigned long flags = ctx->flags;
303 EVP_CIPHER_CTX_reset(ctx);
304 /* Restore encrypt and flags */
310 cipher = ctx->cipher;
312 if (cipher->prov == NULL) {
314 /* We only do explict fetches inside the FIPS module */
315 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
318 EVP_CIPHER *provciph =
319 EVP_CIPHER_fetch(NULL, OBJ_nid2sn(cipher->nid), "");
321 if (provciph == NULL) {
322 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
326 EVP_CIPHER_free(ctx->fetched_cipher);
327 ctx->fetched_cipher = provciph;
331 ctx->cipher = cipher;
332 if (ctx->provctx == NULL) {
333 ctx->provctx = ctx->cipher->newctx(ossl_provider_ctx(cipher->prov));
334 if (ctx->provctx == NULL) {
335 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
340 if ((ctx->flags & EVP_CIPH_NO_PADDING) != 0) {
342 * If this ctx was already set up for no padding then we need to tell
343 * the new cipher about it.
345 if (!EVP_CIPHER_CTX_set_padding(ctx, 0))
350 if (ctx->cipher->einit == NULL) {
351 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
355 return ctx->cipher->einit(ctx->provctx,
358 : EVP_CIPHER_CTX_key_length(ctx),
361 : EVP_CIPHER_CTX_iv_length(ctx));
364 if (ctx->cipher->dinit == NULL) {
365 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
369 return ctx->cipher->dinit(ctx->provctx,
372 : EVP_CIPHER_CTX_key_length(ctx),
375 : EVP_CIPHER_CTX_iv_length(ctx));
377 /* TODO(3.0): Remove legacy code below */
380 if (cipher != NULL) {
382 * Ensure a context left lying around from last time is cleared (we
383 * previously attempted to avoid this if the same ENGINE and
384 * EVP_CIPHER could be used).
387 unsigned long flags = ctx->flags;
388 EVP_CIPHER_CTX_reset(ctx);
389 /* Restore encrypt and flags */
393 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
395 if (!ENGINE_init(impl)) {
396 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
403 /* There's an ENGINE for this job ... (apparently) */
404 const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid);
408 * One positive side-effect of US's export control history,
409 * is that we should at least be able to avoid using US
410 * misspellings of "initialisation"?
412 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
415 /* We'll use the ENGINE's private cipher definition */
418 * Store the ENGINE functional reference so we know 'cipher' came
419 * from an ENGINE and we need to release it when done.
427 ctx->cipher = cipher;
428 if (ctx->cipher->ctx_size) {
429 ctx->cipher_data = OPENSSL_zalloc(ctx->cipher->ctx_size);
430 if (ctx->cipher_data == NULL) {
432 EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE);
436 ctx->cipher_data = NULL;
438 ctx->key_len = cipher->key_len;
439 /* Preserve wrap enable flag, zero everything else */
440 ctx->flags &= EVP_CIPHER_CTX_FLAG_WRAP_ALLOW;
441 if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) {
442 if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) {
444 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
449 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
452 if (ctx->cipher == NULL)
455 /* we assume block size is a power of 2 in *cryptUpdate */
456 OPENSSL_assert(ctx->cipher->block_size == 1
457 || ctx->cipher->block_size == 8
458 || ctx->cipher->block_size == 16);
460 if (!(ctx->flags & EVP_CIPHER_CTX_FLAG_WRAP_ALLOW)
461 && EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_WRAP_MODE) {
462 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_WRAP_MODE_NOT_ALLOWED);
466 if (!(EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(ctx)) & EVP_CIPH_CUSTOM_IV)) {
467 switch (EVP_CIPHER_CTX_mode(ctx)) {
469 case EVP_CIPH_STREAM_CIPHER:
470 case EVP_CIPH_ECB_MODE:
473 case EVP_CIPH_CFB_MODE:
474 case EVP_CIPH_OFB_MODE:
479 case EVP_CIPH_CBC_MODE:
481 OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <=
482 (int)sizeof(ctx->iv));
484 memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
485 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
488 case EVP_CIPH_CTR_MODE:
490 /* Don't reuse IV for CTR mode */
492 memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx));
500 if (key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
501 if (!ctx->cipher->init(ctx, key, iv, enc))
506 ctx->block_mask = ctx->cipher->block_size - 1;
510 int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
511 const unsigned char *in, int inl)
514 return EVP_EncryptUpdate(ctx, out, outl, in, inl);
516 return EVP_DecryptUpdate(ctx, out, outl, in, inl);
519 int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
522 return EVP_EncryptFinal_ex(ctx, out, outl);
524 return EVP_DecryptFinal_ex(ctx, out, outl);
527 int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
530 return EVP_EncryptFinal(ctx, out, outl);
532 return EVP_DecryptFinal(ctx, out, outl);
535 int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
536 const unsigned char *key, const unsigned char *iv)
538 return EVP_CipherInit(ctx, cipher, key, iv, 1);
541 int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
542 ENGINE *impl, const unsigned char *key,
543 const unsigned char *iv)
545 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
548 int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
549 const unsigned char *key, const unsigned char *iv)
551 return EVP_CipherInit(ctx, cipher, key, iv, 0);
554 int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
555 ENGINE *impl, const unsigned char *key,
556 const unsigned char *iv)
558 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
562 * According to the letter of standard difference between pointers
563 * is specified to be valid only within same object. This makes
564 * it formally challenging to determine if input and output buffers
565 * are not partially overlapping with standard pointer arithmetic.
570 #if defined(OPENSSL_SYS_VMS) && __INITIAL_POINTER_SIZE==64
572 * Then we have VMS that distinguishes itself by adhering to
573 * sizeof(size_t)==4 even in 64-bit builds, which means that
574 * difference between two pointers might be truncated to 32 bits.
575 * In the context one can even wonder how comparison for
576 * equality is implemented. To be on the safe side we adhere to
577 * PTRDIFF_T even for comparison for equality.
579 # define PTRDIFF_T uint64_t
581 # define PTRDIFF_T size_t
584 int is_partially_overlapping(const void *ptr1, const void *ptr2, int len)
586 PTRDIFF_T diff = (PTRDIFF_T)ptr1-(PTRDIFF_T)ptr2;
588 * Check for partially overlapping buffers. [Binary logical
589 * operations are used instead of boolean to minimize number
590 * of conditional branches.]
592 int overlapped = (len > 0) & (diff != 0) & ((diff < (PTRDIFF_T)len) |
593 (diff > (0 - (PTRDIFF_T)len)));
598 static int evp_EncryptDecryptUpdate(EVP_CIPHER_CTX *ctx,
599 unsigned char *out, int *outl,
600 const unsigned char *in, int inl)
602 int i, j, bl, cmpl = inl;
604 if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
605 cmpl = (cmpl + 7) / 8;
607 bl = ctx->cipher->block_size;
609 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
610 /* If block size > 1 then the cipher will have to do this check */
611 if (bl == 1 && is_partially_overlapping(out, in, cmpl)) {
612 EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
616 i = ctx->cipher->do_cipher(ctx, out, in, inl);
628 if (is_partially_overlapping(out + ctx->buf_len, in, cmpl)) {
629 EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
633 if (ctx->buf_len == 0 && (inl & (ctx->block_mask)) == 0) {
634 if (ctx->cipher->do_cipher(ctx, out, in, inl)) {
643 OPENSSL_assert(bl <= (int)sizeof(ctx->buf));
646 memcpy(&(ctx->buf[i]), in, inl);
652 memcpy(&(ctx->buf[i]), in, j);
655 if (!ctx->cipher->do_cipher(ctx, out, ctx->buf, bl))
665 if (!ctx->cipher->do_cipher(ctx, out, in, inl))
671 memcpy(ctx->buf, &(in[inl]), i);
677 int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
678 const unsigned char *in, int inl)
684 /* Prevent accidental use of decryption context when encrypting */
686 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_INVALID_OPERATION);
690 if (ctx->cipher == NULL) {
691 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_NO_CIPHER_SET);
695 if (ctx->cipher->prov == NULL)
698 blocksize = EVP_CIPHER_CTX_block_size(ctx);
700 if (ctx->cipher->cupdate == NULL || blocksize < 1) {
701 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR);
704 ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl,
705 inl + (blocksize == 1 ? 0 : blocksize), in,
709 if (soutl > INT_MAX) {
710 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR);
718 /* TODO(3.0): Remove legacy code below */
721 return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl);
724 int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
727 ret = EVP_EncryptFinal_ex(ctx, out, outl);
731 int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
734 unsigned int i, b, bl;
738 /* Prevent accidental use of decryption context when encrypting */
740 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_INVALID_OPERATION);
744 if (ctx->cipher == NULL) {
745 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_NO_CIPHER_SET);
748 if (ctx->cipher->prov == NULL)
751 blocksize = EVP_CIPHER_CTX_block_size(ctx);
753 if (blocksize < 1 || ctx->cipher->cfinal == NULL) {
754 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR);
758 ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl,
759 blocksize == 1 ? 0 : blocksize);
762 if (soutl > INT_MAX) {
763 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR);
771 /* TODO(3.0): Remove legacy code below */
774 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
775 ret = ctx->cipher->do_cipher(ctx, out, NULL, 0);
783 b = ctx->cipher->block_size;
784 OPENSSL_assert(b <= sizeof(ctx->buf));
790 if (ctx->flags & EVP_CIPH_NO_PADDING) {
792 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,
793 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
801 for (i = bl; i < b; i++)
803 ret = ctx->cipher->do_cipher(ctx, out, ctx->buf, b);
811 int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
812 const unsigned char *in, int inl)
814 int fix_len, cmpl = inl, ret;
819 /* Prevent accidental use of encryption context when decrypting */
821 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_INVALID_OPERATION);
825 if (ctx->cipher == NULL) {
826 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_NO_CIPHER_SET);
829 if (ctx->cipher->prov == NULL)
832 blocksize = EVP_CIPHER_CTX_block_size(ctx);
834 if (ctx->cipher->cupdate == NULL || blocksize < 1) {
835 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR);
838 ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl,
839 inl + (blocksize == 1 ? 0 : blocksize), in,
843 if (soutl > INT_MAX) {
844 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR);
852 /* TODO(3.0): Remove legacy code below */
855 b = ctx->cipher->block_size;
857 if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
858 cmpl = (cmpl + 7) / 8;
860 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
861 if (b == 1 && is_partially_overlapping(out, in, cmpl)) {
862 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
866 fix_len = ctx->cipher->do_cipher(ctx, out, in, inl);
880 if (ctx->flags & EVP_CIPH_NO_PADDING)
881 return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl);
883 OPENSSL_assert(b <= sizeof(ctx->final));
885 if (ctx->final_used) {
886 /* see comment about PTRDIFF_T comparison above */
887 if (((PTRDIFF_T)out == (PTRDIFF_T)in)
888 || is_partially_overlapping(out, in, b)) {
889 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
892 memcpy(out, ctx->final, b);
898 if (!evp_EncryptDecryptUpdate(ctx, out, outl, in, inl))
902 * if we have 'decrypted' a multiple of block size, make sure we have a
903 * copy of this last block
905 if (b > 1 && !ctx->buf_len) {
908 memcpy(ctx->final, &out[*outl], b);
918 int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
921 ret = EVP_DecryptFinal_ex(ctx, out, outl);
925 int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
933 /* Prevent accidental use of encryption context when decrypting */
935 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_INVALID_OPERATION);
939 if (ctx->cipher == NULL) {
940 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_NO_CIPHER_SET);
944 if (ctx->cipher->prov == NULL)
947 blocksize = EVP_CIPHER_CTX_block_size(ctx);
949 if (blocksize < 1 || ctx->cipher->cfinal == NULL) {
950 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR);
954 ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl,
955 blocksize == 1 ? 0 : blocksize);
958 if (soutl > INT_MAX) {
959 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR);
967 /* TODO(3.0): Remove legacy code below */
971 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
972 i = ctx->cipher->do_cipher(ctx, out, NULL, 0);
980 b = ctx->cipher->block_size;
981 if (ctx->flags & EVP_CIPH_NO_PADDING) {
983 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,
984 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
991 if (ctx->buf_len || !ctx->final_used) {
992 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_WRONG_FINAL_BLOCK_LENGTH);
995 OPENSSL_assert(b <= sizeof(ctx->final));
998 * The following assumes that the ciphertext has been authenticated.
999 * Otherwise it provides a padding oracle.
1001 n = ctx->final[b - 1];
1002 if (n == 0 || n > (int)b) {
1003 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
1006 for (i = 0; i < n; i++) {
1007 if (ctx->final[--b] != n) {
1008 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
1012 n = ctx->cipher->block_size - n;
1013 for (i = 0; i < n; i++)
1014 out[i] = ctx->final[i];
1021 int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
1024 OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
1025 size_t len = keylen;
1027 params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_KEYLEN, &len);
1028 ok = evp_do_ciph_ctx_setparams(c->cipher, c->provctx, params);
1030 if (ok != EVP_CTRL_RET_UNSUPPORTED)
1033 /* TODO(3.0) legacy code follows */
1034 if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
1035 return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
1036 if (EVP_CIPHER_CTX_key_length(c) == keylen)
1038 if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) {
1039 c->key_len = keylen;
1042 EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH, EVP_R_INVALID_KEY_LENGTH);
1046 int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
1049 OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
1050 unsigned int pd = pad;
1053 ctx->flags &= ~EVP_CIPH_NO_PADDING;
1055 ctx->flags |= EVP_CIPH_NO_PADDING;
1057 params[0] = OSSL_PARAM_construct_uint(OSSL_CIPHER_PARAM_PADDING, &pd);
1058 ok = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1063 int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
1065 int ret = EVP_CTRL_RET_UNSUPPORTED;
1069 OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
1071 if (ctx == NULL || ctx->cipher == NULL) {
1072 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
1076 if (ctx->cipher->prov == NULL)
1080 case EVP_CTRL_SET_KEY_LENGTH:
1081 params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_KEYLEN, &sz);
1083 case EVP_CTRL_RAND_KEY: /* Used by DES */
1086 OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_RANDOM_KEY,
1090 case EVP_CTRL_SET_PIPELINE_OUTPUT_BUFS: /* Used by DASYNC */
1091 case EVP_CTRL_INIT: /* TODO(3.0) Purely legacy, no provider counterpart */
1093 return EVP_CTRL_RET_UNSUPPORTED;
1094 case EVP_CTRL_GET_IV:
1096 params[0] = OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_IV,
1099 case EVP_CTRL_AEAD_SET_IVLEN:
1102 params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_IVLEN, &sz);
1104 case EVP_CTRL_GCM_SET_IV_FIXED:
1106 OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TLS1_IV_FIXED,
1109 case EVP_CTRL_GET_RC5_ROUNDS:
1110 set_params = 0; /* Fall thru */
1111 case EVP_CTRL_SET_RC5_ROUNDS:
1114 i = (unsigned int)arg;
1115 params[0] = OSSL_PARAM_construct_uint(OSSL_CIPHER_PARAM_ROUNDS, &i);
1117 case EVP_CTRL_AEAD_GET_TAG:
1118 set_params = 0; /* Fall thru */
1119 case EVP_CTRL_AEAD_SET_TAG:
1120 params[0] = OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TAG,
1123 case EVP_CTRL_AEAD_TLS1_AAD:
1124 /* This one does a set and a get - since it returns a padding size */
1126 OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TLS1_AAD,
1128 ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1132 OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_AEAD_TLS1_AAD_PAD, &sz);
1133 ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
1137 #ifndef OPENSSL_NO_RC2
1138 case EVP_CTRL_GET_RC2_KEY_BITS:
1139 set_params = 0; /* Fall thru */
1140 case EVP_CTRL_SET_RC2_KEY_BITS:
1141 params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_RC2_KEYBITS, &sz);
1143 #endif /* OPENSSL_NO_RC2 */
1147 ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1149 ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
1152 /* TODO(3.0): Remove legacy code below */
1154 if (ctx->cipher->ctrl == NULL) {
1155 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
1159 ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
1162 if (ret == EVP_CTRL_RET_UNSUPPORTED) {
1163 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL,
1164 EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
1170 int EVP_CIPHER_get_params(EVP_CIPHER *cipher, OSSL_PARAM params[])
1172 if (cipher != NULL && cipher->get_params != NULL)
1173 return cipher->get_params(params);
1177 int EVP_CIPHER_CTX_set_params(EVP_CIPHER_CTX *ctx, const OSSL_PARAM params[])
1179 if (ctx->cipher != NULL && ctx->cipher->set_ctx_params != NULL)
1180 return ctx->cipher->set_ctx_params(ctx->provctx, params);
1184 int EVP_CIPHER_CTX_get_params(EVP_CIPHER_CTX *ctx, OSSL_PARAM params[])
1186 if (ctx->cipher != NULL && ctx->cipher->get_ctx_params != NULL)
1187 return ctx->cipher->get_ctx_params(ctx->provctx, params);
1191 const OSSL_PARAM *EVP_CIPHER_gettable_params(const EVP_CIPHER *cipher)
1193 if (cipher != NULL && cipher->gettable_params != NULL)
1194 return cipher->gettable_params();
1198 const OSSL_PARAM *EVP_CIPHER_settable_ctx_params(const EVP_CIPHER *cipher)
1200 if (cipher != NULL && cipher->settable_ctx_params != NULL)
1201 return cipher->settable_ctx_params();
1205 const OSSL_PARAM *EVP_CIPHER_gettable_ctx_params(const EVP_CIPHER *cipher)
1207 if (cipher != NULL && cipher->gettable_ctx_params != NULL)
1208 return cipher->gettable_ctx_params();
1212 int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key)
1214 if (ctx->cipher->flags & EVP_CIPH_RAND_KEY)
1215 return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key);
1223 kl = EVP_CIPHER_CTX_key_length(ctx);
1224 if (kl <= 0 || RAND_priv_bytes(key, kl) <= 0)
1228 #endif /* FIPS_MODE */
1231 int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in)
1233 if ((in == NULL) || (in->cipher == NULL)) {
1234 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INPUT_NOT_INITIALIZED);
1238 if (in->cipher->prov == NULL)
1241 if (in->cipher->dupctx == NULL) {
1242 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX);
1246 EVP_CIPHER_CTX_reset(out);
1249 out->provctx = NULL;
1251 if (in->fetched_cipher != NULL && !EVP_CIPHER_up_ref(in->fetched_cipher)) {
1252 out->fetched_cipher = NULL;
1256 out->provctx = in->cipher->dupctx(in->provctx);
1257 if (out->provctx == NULL) {
1258 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX);
1264 /* TODO(3.0): Remove legacy code below */
1267 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
1268 /* Make sure it's safe to copy a cipher context using an ENGINE */
1269 if (in->engine && !ENGINE_init(in->engine)) {
1270 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_ENGINE_LIB);
1275 EVP_CIPHER_CTX_reset(out);
1276 memcpy(out, in, sizeof(*out));
1278 if (in->cipher_data && in->cipher->ctx_size) {
1279 out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size);
1280 if (out->cipher_data == NULL) {
1282 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_MALLOC_FAILURE);
1285 memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size);
1288 if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY)
1289 if (!in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out)) {
1291 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INITIALIZATION_ERROR);
1297 EVP_CIPHER *evp_cipher_new(void)
1299 EVP_CIPHER *cipher = OPENSSL_zalloc(sizeof(EVP_CIPHER));
1301 if (cipher != NULL) {
1302 cipher->lock = CRYPTO_THREAD_lock_new();
1303 if (cipher->lock == NULL) {
1304 OPENSSL_free(cipher);
1313 * FIPS module note: since internal fetches will be entirely
1314 * provider based, we know that none of its code depends on legacy
1315 * NIDs or any functionality that use them.
1318 /* TODO(3.x) get rid of the need for legacy NIDs */
1319 static void set_legacy_nid(const char *name, void *vlegacy_nid)
1322 int *legacy_nid = vlegacy_nid;
1324 if (*legacy_nid == -1) /* We found a clash already */
1326 if ((nid = OBJ_sn2nid(name)) == NID_undef
1327 && (nid = OBJ_ln2nid(name)) == NID_undef)
1329 if (*legacy_nid != NID_undef && *legacy_nid != nid) {
1337 static void *evp_cipher_from_dispatch(const int name_id,
1338 const OSSL_DISPATCH *fns,
1339 OSSL_PROVIDER *prov,
1342 EVP_CIPHER *cipher = NULL;
1343 int fnciphcnt = 0, fnctxcnt = 0;
1345 if ((cipher = evp_cipher_new()) == NULL) {
1346 EVPerr(0, ERR_R_MALLOC_FAILURE);
1351 /* TODO(3.x) get rid of the need for legacy NIDs */
1352 cipher->nid = NID_undef;
1353 evp_doall_names(prov, name_id, set_legacy_nid, &cipher->nid);
1354 if (cipher->nid == -1) {
1355 ERR_raise(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR);
1356 EVP_CIPHER_free(cipher);
1361 cipher->name_id = name_id;
1363 for (; fns->function_id != 0; fns++) {
1364 switch (fns->function_id) {
1365 case OSSL_FUNC_CIPHER_NEWCTX:
1366 if (cipher->newctx != NULL)
1368 cipher->newctx = OSSL_get_OP_cipher_newctx(fns);
1371 case OSSL_FUNC_CIPHER_ENCRYPT_INIT:
1372 if (cipher->einit != NULL)
1374 cipher->einit = OSSL_get_OP_cipher_encrypt_init(fns);
1377 case OSSL_FUNC_CIPHER_DECRYPT_INIT:
1378 if (cipher->dinit != NULL)
1380 cipher->dinit = OSSL_get_OP_cipher_decrypt_init(fns);
1383 case OSSL_FUNC_CIPHER_UPDATE:
1384 if (cipher->cupdate != NULL)
1386 cipher->cupdate = OSSL_get_OP_cipher_update(fns);
1389 case OSSL_FUNC_CIPHER_FINAL:
1390 if (cipher->cfinal != NULL)
1392 cipher->cfinal = OSSL_get_OP_cipher_final(fns);
1395 case OSSL_FUNC_CIPHER_CIPHER:
1396 if (cipher->ccipher != NULL)
1398 cipher->ccipher = OSSL_get_OP_cipher_cipher(fns);
1400 case OSSL_FUNC_CIPHER_FREECTX:
1401 if (cipher->freectx != NULL)
1403 cipher->freectx = OSSL_get_OP_cipher_freectx(fns);
1406 case OSSL_FUNC_CIPHER_DUPCTX:
1407 if (cipher->dupctx != NULL)
1409 cipher->dupctx = OSSL_get_OP_cipher_dupctx(fns);
1411 case OSSL_FUNC_CIPHER_GET_PARAMS:
1412 if (cipher->get_params != NULL)
1414 cipher->get_params = OSSL_get_OP_cipher_get_params(fns);
1416 case OSSL_FUNC_CIPHER_GET_CTX_PARAMS:
1417 if (cipher->get_ctx_params != NULL)
1419 cipher->get_ctx_params = OSSL_get_OP_cipher_get_ctx_params(fns);
1421 case OSSL_FUNC_CIPHER_SET_CTX_PARAMS:
1422 if (cipher->set_ctx_params != NULL)
1424 cipher->set_ctx_params = OSSL_get_OP_cipher_set_ctx_params(fns);
1426 case OSSL_FUNC_CIPHER_GETTABLE_PARAMS:
1427 if (cipher->gettable_params != NULL)
1429 cipher->gettable_params = OSSL_get_OP_cipher_gettable_params(fns);
1431 case OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS:
1432 if (cipher->gettable_ctx_params != NULL)
1434 cipher->gettable_ctx_params =
1435 OSSL_get_OP_cipher_gettable_ctx_params(fns);
1437 case OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS:
1438 if (cipher->settable_ctx_params != NULL)
1440 cipher->settable_ctx_params =
1441 OSSL_get_OP_cipher_settable_ctx_params(fns);
1445 if ((fnciphcnt != 0 && fnciphcnt != 3 && fnciphcnt != 4)
1446 || (fnciphcnt == 0 && cipher->ccipher == NULL)
1449 * In order to be a consistent set of functions we must have at least
1450 * a complete set of "encrypt" functions, or a complete set of "decrypt"
1451 * functions, or a single "cipher" function. In all cases we need both
1452 * the "newctx" and "freectx" functions.
1454 EVP_CIPHER_free(cipher);
1455 EVPerr(EVP_F_EVP_CIPHER_FROM_DISPATCH, EVP_R_INVALID_PROVIDER_FUNCTIONS);
1458 cipher->prov = prov;
1460 ossl_provider_up_ref(prov);
1465 static int evp_cipher_up_ref(void *cipher)
1467 return EVP_CIPHER_up_ref(cipher);
1470 static void evp_cipher_free(void *cipher)
1472 EVP_CIPHER_free(cipher);
1475 EVP_CIPHER *EVP_CIPHER_fetch(OPENSSL_CTX *ctx, const char *algorithm,
1476 const char *properties)
1478 EVP_CIPHER *cipher =
1479 evp_generic_fetch(ctx, OSSL_OP_CIPHER, algorithm, properties,
1480 evp_cipher_from_dispatch, NULL, evp_cipher_up_ref,
1486 int EVP_CIPHER_up_ref(EVP_CIPHER *cipher)
1490 CRYPTO_UP_REF(&cipher->refcnt, &ref, cipher->lock);
1494 void EVP_CIPHER_free(EVP_CIPHER *cipher)
1501 CRYPTO_DOWN_REF(&cipher->refcnt, &i, cipher->lock);
1504 ossl_provider_free(cipher->prov);
1505 CRYPTO_THREAD_lock_free(cipher->lock);
1506 OPENSSL_free(cipher);
1509 void EVP_CIPHER_do_all_ex(OPENSSL_CTX *libctx,
1510 void (*fn)(EVP_CIPHER *mac, void *arg),
1513 evp_generic_do_all(libctx, OSSL_OP_CIPHER,
1514 (void (*)(void *, void *))fn, arg,
1515 evp_cipher_from_dispatch, NULL, evp_cipher_free);