2 * Copyright 1995-2019 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
12 #include "internal/cryptlib.h"
13 #include <openssl/evp.h>
14 #include <openssl/err.h>
15 #include <openssl/rand.h>
16 #include <openssl/rand_drbg.h>
17 #include <openssl/engine.h>
18 #include <openssl/params.h>
19 #include <openssl/core_names.h>
20 #include "internal/evp_int.h"
21 #include "internal/provider.h"
24 int EVP_CIPHER_CTX_reset(EVP_CIPHER_CTX *ctx)
29 if (ctx->cipher == NULL || ctx->cipher->prov == NULL)
32 if (ctx->provctx != NULL) {
33 if (ctx->cipher->freectx != NULL)
34 ctx->cipher->freectx(ctx->provctx);
37 if (ctx->fetched_cipher != NULL)
38 EVP_CIPHER_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_gcm:
169 case NID_aes_192_gcm:
170 case NID_aes_128_gcm:
171 case NID_aria_256_gcm:
172 case NID_aria_192_gcm:
173 case NID_aria_128_gcm:
174 case NID_aes_256_ccm:
175 case NID_aes_192_ccm:
176 case NID_aes_128_ccm:
177 case NID_aria_256_ccm:
178 case NID_aria_192_ccm:
179 case NID_aria_128_ccm:
180 case NID_aria_256_ecb:
181 case NID_aria_192_ecb:
182 case NID_aria_128_ecb:
183 case NID_aria_256_cbc:
184 case NID_aria_192_cbc:
185 case NID_aria_128_cbc:
186 case NID_aria_256_ofb128:
187 case NID_aria_192_ofb128:
188 case NID_aria_128_ofb128:
189 case NID_aria_256_cfb128:
190 case NID_aria_192_cfb128:
191 case NID_aria_128_cfb128:
192 case NID_aria_256_cfb1:
193 case NID_aria_192_cfb1:
194 case NID_aria_128_cfb1:
195 case NID_aria_256_cfb8:
196 case NID_aria_192_cfb8:
197 case NID_aria_128_cfb8:
198 case NID_aria_256_ctr:
199 case NID_aria_192_ctr:
200 case NID_aria_128_ctr:
201 case NID_camellia_256_ecb:
202 case NID_camellia_192_ecb:
203 case NID_camellia_128_ecb:
204 case NID_camellia_256_cbc:
205 case NID_camellia_192_cbc:
206 case NID_camellia_128_cbc:
207 case NID_camellia_256_ofb128:
208 case NID_camellia_192_ofb128:
209 case NID_camellia_128_ofb128:
210 case NID_camellia_256_cfb128:
211 case NID_camellia_192_cfb128:
212 case NID_camellia_128_cfb128:
213 case NID_camellia_256_cfb1:
214 case NID_camellia_192_cfb1:
215 case NID_camellia_128_cfb1:
216 case NID_camellia_256_cfb8:
217 case NID_camellia_192_cfb8:
218 case NID_camellia_128_cfb8:
219 case NID_camellia_256_ctr:
220 case NID_camellia_192_ctr:
221 case NID_camellia_128_ctr:
222 case NID_des_ede3_cbc:
223 case NID_des_ede3_ecb:
224 case NID_des_ede3_ofb64:
225 case NID_des_ede3_cfb64:
226 case NID_des_ede3_cfb8:
227 case NID_des_ede3_cfb1:
228 case NID_des_ede_cbc:
229 case NID_des_ede_ecb:
230 case NID_des_ede_ofb64:
231 case NID_des_ede_cfb64:
233 case NID_id_smime_alg_CMS3DESwrap:
244 case NID_cast5_cfb64:
245 case NID_cast5_ofb64:
248 case NID_seed_cfb128:
249 case NID_seed_ofb128:
262 * Ensure a context left lying around from last time is cleared
265 if (cipher != NULL && ctx->cipher != NULL) {
266 OPENSSL_clear_free(ctx->cipher_data, ctx->cipher->ctx_size);
267 ctx->cipher_data = NULL;
271 /* TODO(3.0): Start of non-legacy code below */
273 /* Ensure a context left lying around from last time is cleared */
274 if (cipher != NULL && ctx->cipher != NULL) {
275 unsigned long flags = ctx->flags;
277 EVP_CIPHER_CTX_reset(ctx);
278 /* Restore encrypt and flags */
284 cipher = ctx->cipher;
286 if (cipher->prov == NULL) {
288 /* We only do explict fetches inside the FIPS module */
289 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
292 EVP_CIPHER *provciph =
293 EVP_CIPHER_fetch(NULL, OBJ_nid2sn(cipher->nid), "");
295 if (provciph == NULL) {
296 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
300 EVP_CIPHER_free(ctx->fetched_cipher);
301 ctx->fetched_cipher = provciph;
305 ctx->cipher = cipher;
306 if (ctx->provctx == NULL) {
307 ctx->provctx = ctx->cipher->newctx(ossl_provider_ctx(cipher->prov));
308 if (ctx->provctx == NULL) {
309 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
314 if ((ctx->flags & EVP_CIPH_NO_PADDING) != 0) {
316 * If this ctx was already set up for no padding then we need to tell
317 * the new cipher about it.
319 if (!EVP_CIPHER_CTX_set_padding(ctx, 0))
323 switch (EVP_CIPHER_mode(ctx->cipher)) {
324 case EVP_CIPH_CFB_MODE:
325 case EVP_CIPH_OFB_MODE:
326 case EVP_CIPH_CBC_MODE:
327 /* For these modes we remember the original IV for later use */
328 if (!ossl_assert(EVP_CIPHER_CTX_iv_length(ctx) <= (int)sizeof(ctx->oiv))) {
329 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
333 memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
337 if (ctx->cipher->einit == NULL) {
338 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
342 return ctx->cipher->einit(ctx->provctx,
345 : EVP_CIPHER_CTX_key_length(ctx),
348 : EVP_CIPHER_CTX_iv_length(ctx));
351 if (ctx->cipher->dinit == NULL) {
352 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
356 return ctx->cipher->dinit(ctx->provctx,
359 : EVP_CIPHER_CTX_key_length(ctx),
362 : EVP_CIPHER_CTX_iv_length(ctx));
364 /* TODO(3.0): Remove legacy code below */
367 if (cipher != NULL) {
369 * Ensure a context left lying around from last time is cleared (we
370 * previously attempted to avoid this if the same ENGINE and
371 * EVP_CIPHER could be used).
374 unsigned long flags = ctx->flags;
375 EVP_CIPHER_CTX_reset(ctx);
376 /* Restore encrypt and flags */
380 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
382 if (!ENGINE_init(impl)) {
383 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
390 /* There's an ENGINE for this job ... (apparently) */
391 const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid);
395 * One positive side-effect of US's export control history,
396 * is that we should at least be able to avoid using US
397 * misspellings of "initialisation"?
399 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
402 /* We'll use the ENGINE's private cipher definition */
405 * Store the ENGINE functional reference so we know 'cipher' came
406 * from an ENGINE and we need to release it when done.
414 ctx->cipher = cipher;
415 if (ctx->cipher->ctx_size) {
416 ctx->cipher_data = OPENSSL_zalloc(ctx->cipher->ctx_size);
417 if (ctx->cipher_data == NULL) {
419 EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE);
423 ctx->cipher_data = NULL;
425 ctx->key_len = cipher->key_len;
426 /* Preserve wrap enable flag, zero everything else */
427 ctx->flags &= EVP_CIPHER_CTX_FLAG_WRAP_ALLOW;
428 if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) {
429 if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) {
431 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
436 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
439 if (ctx->cipher == NULL)
442 /* we assume block size is a power of 2 in *cryptUpdate */
443 OPENSSL_assert(ctx->cipher->block_size == 1
444 || ctx->cipher->block_size == 8
445 || ctx->cipher->block_size == 16);
447 if (!(ctx->flags & EVP_CIPHER_CTX_FLAG_WRAP_ALLOW)
448 && EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_WRAP_MODE) {
449 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_WRAP_MODE_NOT_ALLOWED);
453 if (!(EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(ctx)) & EVP_CIPH_CUSTOM_IV)) {
454 switch (EVP_CIPHER_CTX_mode(ctx)) {
456 case EVP_CIPH_STREAM_CIPHER:
457 case EVP_CIPH_ECB_MODE:
460 case EVP_CIPH_CFB_MODE:
461 case EVP_CIPH_OFB_MODE:
466 case EVP_CIPH_CBC_MODE:
468 OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <=
469 (int)sizeof(ctx->iv));
471 memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
472 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
475 case EVP_CIPH_CTR_MODE:
477 /* Don't reuse IV for CTR mode */
479 memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx));
487 if (key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
488 if (!ctx->cipher->init(ctx, key, iv, enc))
493 ctx->block_mask = ctx->cipher->block_size - 1;
497 int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
498 const unsigned char *in, int inl)
501 return EVP_EncryptUpdate(ctx, out, outl, in, inl);
503 return EVP_DecryptUpdate(ctx, out, outl, in, inl);
506 int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
509 return EVP_EncryptFinal_ex(ctx, out, outl);
511 return EVP_DecryptFinal_ex(ctx, out, outl);
514 int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
517 return EVP_EncryptFinal(ctx, out, outl);
519 return EVP_DecryptFinal(ctx, out, outl);
522 int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
523 const unsigned char *key, const unsigned char *iv)
525 return EVP_CipherInit(ctx, cipher, key, iv, 1);
528 int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
529 ENGINE *impl, const unsigned char *key,
530 const unsigned char *iv)
532 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
535 int EVP_DecryptInit(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, 0);
541 int EVP_DecryptInit_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, 0);
549 * According to the letter of standard difference between pointers
550 * is specified to be valid only within same object. This makes
551 * it formally challenging to determine if input and output buffers
552 * are not partially overlapping with standard pointer arithmetic.
557 #if defined(OPENSSL_SYS_VMS) && __INITIAL_POINTER_SIZE==64
559 * Then we have VMS that distinguishes itself by adhering to
560 * sizeof(size_t)==4 even in 64-bit builds, which means that
561 * difference between two pointers might be truncated to 32 bits.
562 * In the context one can even wonder how comparison for
563 * equality is implemented. To be on the safe side we adhere to
564 * PTRDIFF_T even for comparison for equality.
566 # define PTRDIFF_T uint64_t
568 # define PTRDIFF_T size_t
571 int is_partially_overlapping(const void *ptr1, const void *ptr2, int len)
573 PTRDIFF_T diff = (PTRDIFF_T)ptr1-(PTRDIFF_T)ptr2;
575 * Check for partially overlapping buffers. [Binary logical
576 * operations are used instead of boolean to minimize number
577 * of conditional branches.]
579 int overlapped = (len > 0) & (diff != 0) & ((diff < (PTRDIFF_T)len) |
580 (diff > (0 - (PTRDIFF_T)len)));
585 static int evp_EncryptDecryptUpdate(EVP_CIPHER_CTX *ctx,
586 unsigned char *out, int *outl,
587 const unsigned char *in, int inl)
589 int i, j, bl, cmpl = inl;
591 if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
592 cmpl = (cmpl + 7) / 8;
594 bl = ctx->cipher->block_size;
596 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
597 /* If block size > 1 then the cipher will have to do this check */
598 if (bl == 1 && is_partially_overlapping(out, in, cmpl)) {
599 EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
603 i = ctx->cipher->do_cipher(ctx, out, in, inl);
615 if (is_partially_overlapping(out + ctx->buf_len, in, cmpl)) {
616 EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
620 if (ctx->buf_len == 0 && (inl & (ctx->block_mask)) == 0) {
621 if (ctx->cipher->do_cipher(ctx, out, in, inl)) {
630 OPENSSL_assert(bl <= (int)sizeof(ctx->buf));
633 memcpy(&(ctx->buf[i]), in, inl);
639 memcpy(&(ctx->buf[i]), in, j);
642 if (!ctx->cipher->do_cipher(ctx, out, ctx->buf, bl))
652 if (!ctx->cipher->do_cipher(ctx, out, in, inl))
658 memcpy(ctx->buf, &(in[inl]), i);
664 int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
665 const unsigned char *in, int inl)
671 /* Prevent accidental use of decryption context when encrypting */
673 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_INVALID_OPERATION);
677 if (ctx->cipher == NULL) {
678 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_NO_CIPHER_SET);
682 if (ctx->cipher->prov == NULL)
685 blocksize = EVP_CIPHER_CTX_block_size(ctx);
687 if (ctx->cipher->cupdate == NULL || blocksize < 1) {
688 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR);
691 ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl,
692 inl + (blocksize == 1 ? 0 : blocksize), in,
696 if (soutl > INT_MAX) {
697 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR);
705 /* TODO(3.0): Remove legacy code below */
708 return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl);
711 int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
714 ret = EVP_EncryptFinal_ex(ctx, out, outl);
718 int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
721 unsigned int i, b, bl;
725 /* Prevent accidental use of decryption context when encrypting */
727 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_INVALID_OPERATION);
731 if (ctx->cipher == NULL) {
732 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_NO_CIPHER_SET);
735 if (ctx->cipher->prov == NULL)
738 blocksize = EVP_CIPHER_CTX_block_size(ctx);
740 if (blocksize < 1 || ctx->cipher->cfinal == NULL) {
741 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR);
745 ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl,
746 blocksize == 1 ? 0 : blocksize);
749 if (soutl > INT_MAX) {
750 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR);
758 /* TODO(3.0): Remove legacy code below */
761 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
762 ret = ctx->cipher->do_cipher(ctx, out, NULL, 0);
770 b = ctx->cipher->block_size;
771 OPENSSL_assert(b <= sizeof(ctx->buf));
777 if (ctx->flags & EVP_CIPH_NO_PADDING) {
779 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,
780 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
788 for (i = bl; i < b; i++)
790 ret = ctx->cipher->do_cipher(ctx, out, ctx->buf, b);
798 int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
799 const unsigned char *in, int inl)
801 int fix_len, cmpl = inl, ret;
806 /* Prevent accidental use of encryption context when decrypting */
808 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_INVALID_OPERATION);
812 if (ctx->cipher == NULL) {
813 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_NO_CIPHER_SET);
816 if (ctx->cipher->prov == NULL)
819 blocksize = EVP_CIPHER_CTX_block_size(ctx);
821 if (ctx->cipher->cupdate == NULL || blocksize < 1) {
822 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR);
825 ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl,
826 inl + (blocksize == 1 ? 0 : blocksize), in,
830 if (soutl > INT_MAX) {
831 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR);
839 /* TODO(3.0): Remove legacy code below */
842 b = ctx->cipher->block_size;
844 if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
845 cmpl = (cmpl + 7) / 8;
847 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
848 if (b == 1 && is_partially_overlapping(out, in, cmpl)) {
849 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
853 fix_len = ctx->cipher->do_cipher(ctx, out, in, inl);
867 if (ctx->flags & EVP_CIPH_NO_PADDING)
868 return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl);
870 OPENSSL_assert(b <= sizeof(ctx->final));
872 if (ctx->final_used) {
873 /* see comment about PTRDIFF_T comparison above */
874 if (((PTRDIFF_T)out == (PTRDIFF_T)in)
875 || is_partially_overlapping(out, in, b)) {
876 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
879 memcpy(out, ctx->final, b);
885 if (!evp_EncryptDecryptUpdate(ctx, out, outl, in, inl))
889 * if we have 'decrypted' a multiple of block size, make sure we have a
890 * copy of this last block
892 if (b > 1 && !ctx->buf_len) {
895 memcpy(ctx->final, &out[*outl], b);
905 int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
908 ret = EVP_DecryptFinal_ex(ctx, out, outl);
912 int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
920 /* Prevent accidental use of encryption context when decrypting */
922 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_INVALID_OPERATION);
926 if (ctx->cipher == NULL) {
927 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_NO_CIPHER_SET);
931 if (ctx->cipher->prov == NULL)
934 blocksize = EVP_CIPHER_CTX_block_size(ctx);
936 if (blocksize < 1 || ctx->cipher->cfinal == NULL) {
937 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR);
941 ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl,
942 blocksize == 1 ? 0 : blocksize);
945 if (soutl > INT_MAX) {
946 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR);
954 /* TODO(3.0): Remove legacy code below */
958 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
959 i = ctx->cipher->do_cipher(ctx, out, NULL, 0);
967 b = ctx->cipher->block_size;
968 if (ctx->flags & EVP_CIPH_NO_PADDING) {
970 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,
971 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
978 if (ctx->buf_len || !ctx->final_used) {
979 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_WRONG_FINAL_BLOCK_LENGTH);
982 OPENSSL_assert(b <= sizeof(ctx->final));
985 * The following assumes that the ciphertext has been authenticated.
986 * Otherwise it provides a padding oracle.
988 n = ctx->final[b - 1];
989 if (n == 0 || n > (int)b) {
990 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
993 for (i = 0; i < n; i++) {
994 if (ctx->final[--b] != n) {
995 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
999 n = ctx->cipher->block_size - n;
1000 for (i = 0; i < n; i++)
1001 out[i] = ctx->final[i];
1008 int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
1011 OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
1012 size_t len = keylen;
1014 params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_KEYLEN, &len);
1015 ok = evp_do_ciph_ctx_setparams(c->cipher, c->provctx, params);
1017 if (ok != EVP_CTRL_RET_UNSUPPORTED)
1020 /* TODO(3.0) legacy code follows */
1021 if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
1022 return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
1023 if (EVP_CIPHER_CTX_key_length(c) == keylen)
1025 if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) {
1026 c->key_len = keylen;
1029 EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH, EVP_R_INVALID_KEY_LENGTH);
1033 int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
1036 OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
1037 unsigned int pd = pad;
1040 ctx->flags &= ~EVP_CIPH_NO_PADDING;
1042 ctx->flags |= EVP_CIPH_NO_PADDING;
1044 params[0] = OSSL_PARAM_construct_uint(OSSL_CIPHER_PARAM_PADDING, &pd);
1045 ok = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1050 int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
1052 int ret = EVP_CTRL_RET_UNSUPPORTED;
1055 OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
1057 if (ctx == NULL || ctx->cipher == NULL) {
1058 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
1062 if (ctx->cipher->prov == NULL)
1066 case EVP_CTRL_SET_KEY_LENGTH:
1067 params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_KEYLEN, &sz);
1069 case EVP_CTRL_RAND_KEY: /* Used by DES */
1072 OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_RANDOM_KEY,
1076 case EVP_CTRL_SET_PIPELINE_OUTPUT_BUFS: /* Used by DASYNC */
1077 case EVP_CTRL_INIT: /* TODO(3.0) Purely legacy, no provider counterpart */
1079 return EVP_CTRL_RET_UNSUPPORTED;
1080 case EVP_CTRL_GET_IV:
1082 params[0] = OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_IV,
1085 case EVP_CTRL_AEAD_SET_IVLEN:
1088 params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_IVLEN, &sz);
1090 case EVP_CTRL_GCM_SET_IV_FIXED:
1092 OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TLS1_IV_FIXED,
1095 case EVP_CTRL_AEAD_GET_TAG:
1096 set_params = 0; /* Fall thru */
1097 case EVP_CTRL_AEAD_SET_TAG:
1098 params[0] = OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TAG,
1101 case EVP_CTRL_AEAD_TLS1_AAD:
1102 /* This one does a set and a get - since it returns a padding size */
1104 OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TLS1_AAD,
1106 ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1110 OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_AEAD_TLS1_AAD_PAD, &sz);
1111 ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
1118 ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1120 ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
1123 /* TODO(3.0): Remove legacy code below */
1125 if (ctx->cipher->ctrl == NULL) {
1126 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
1130 ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
1131 if (ret == EVP_CTRL_RET_UNSUPPORTED) {
1132 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL,
1133 EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
1139 int EVP_CIPHER_get_params(EVP_CIPHER *cipher, OSSL_PARAM params[])
1141 if (cipher != NULL && cipher->get_params != NULL)
1142 return cipher->get_params(params);
1146 int EVP_CIPHER_CTX_set_params(EVP_CIPHER_CTX *ctx, const OSSL_PARAM params[])
1148 if (ctx->cipher != NULL && ctx->cipher->set_ctx_params != NULL)
1149 return ctx->cipher->set_ctx_params(ctx->provctx, params);
1153 int EVP_CIPHER_CTX_get_params(EVP_CIPHER_CTX *ctx, OSSL_PARAM params[])
1155 if (ctx->cipher != NULL && ctx->cipher->get_ctx_params != NULL)
1156 return ctx->cipher->get_ctx_params(ctx->provctx, params);
1160 const OSSL_PARAM *EVP_CIPHER_gettable_params(const EVP_CIPHER *cipher)
1162 if (cipher != NULL && cipher->gettable_params != NULL)
1163 return cipher->gettable_params();
1167 const OSSL_PARAM *EVP_CIPHER_CTX_settable_params(const EVP_CIPHER *cipher)
1169 if (cipher != NULL && cipher->settable_ctx_params != NULL)
1170 return cipher->settable_ctx_params();
1174 const OSSL_PARAM *EVP_CIPHER_CTX_gettable_params(const EVP_CIPHER *cipher)
1176 if (cipher != NULL && cipher->gettable_ctx_params != NULL)
1177 return cipher->gettable_ctx_params();
1181 int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key)
1183 if (ctx->cipher->flags & EVP_CIPH_RAND_KEY)
1184 return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key);
1192 kl = EVP_CIPHER_CTX_key_length(ctx);
1193 if (kl <= 0 || RAND_priv_bytes(key, kl) <= 0)
1197 #endif /* FIPS_MODE */
1200 int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in)
1202 if ((in == NULL) || (in->cipher == NULL)) {
1203 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INPUT_NOT_INITIALIZED);
1207 if (in->cipher->prov == NULL)
1210 if (in->cipher->dupctx == NULL) {
1211 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX);
1215 EVP_CIPHER_CTX_reset(out);
1218 out->provctx = NULL;
1220 if (in->fetched_cipher != NULL && !EVP_CIPHER_up_ref(in->fetched_cipher)) {
1221 out->fetched_cipher = NULL;
1225 out->provctx = in->cipher->dupctx(in->provctx);
1226 if (out->provctx == NULL) {
1227 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX);
1233 /* TODO(3.0): Remove legacy code below */
1236 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
1237 /* Make sure it's safe to copy a cipher context using an ENGINE */
1238 if (in->engine && !ENGINE_init(in->engine)) {
1239 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_ENGINE_LIB);
1244 EVP_CIPHER_CTX_reset(out);
1245 memcpy(out, in, sizeof(*out));
1247 if (in->cipher_data && in->cipher->ctx_size) {
1248 out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size);
1249 if (out->cipher_data == NULL) {
1251 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_MALLOC_FAILURE);
1254 memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size);
1257 if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY)
1258 if (!in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out)) {
1260 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INITIALIZATION_ERROR);
1266 EVP_CIPHER *evp_cipher_new(void)
1268 EVP_CIPHER *cipher = OPENSSL_zalloc(sizeof(EVP_CIPHER));
1270 if (cipher != NULL) {
1271 cipher->lock = CRYPTO_THREAD_lock_new();
1272 if (cipher->lock == NULL) {
1273 OPENSSL_free(cipher);
1281 static void *evp_cipher_from_dispatch(const char *name,
1282 const OSSL_DISPATCH *fns,
1283 OSSL_PROVIDER *prov,
1286 EVP_CIPHER *cipher = NULL;
1287 int fnciphcnt = 0, fnctxcnt = 0;
1289 if ((cipher = evp_cipher_new()) == NULL
1290 || (cipher->name = OPENSSL_strdup(name)) == NULL) {
1291 EVP_CIPHER_free(cipher);
1292 EVPerr(0, ERR_R_MALLOC_FAILURE);
1298 * FIPS module note: since internal fetches will be entirely
1299 * provider based, we know that none of its code depends on legacy
1300 * NIDs or any functionality that use them.
1302 * TODO(3.x) get rid of the need for legacy NIDs
1304 cipher->nid = OBJ_sn2nid(name);
1307 for (; fns->function_id != 0; fns++) {
1308 switch (fns->function_id) {
1309 case OSSL_FUNC_CIPHER_NEWCTX:
1310 if (cipher->newctx != NULL)
1312 cipher->newctx = OSSL_get_OP_cipher_newctx(fns);
1315 case OSSL_FUNC_CIPHER_ENCRYPT_INIT:
1316 if (cipher->einit != NULL)
1318 cipher->einit = OSSL_get_OP_cipher_encrypt_init(fns);
1321 case OSSL_FUNC_CIPHER_DECRYPT_INIT:
1322 if (cipher->dinit != NULL)
1324 cipher->dinit = OSSL_get_OP_cipher_decrypt_init(fns);
1327 case OSSL_FUNC_CIPHER_UPDATE:
1328 if (cipher->cupdate != NULL)
1330 cipher->cupdate = OSSL_get_OP_cipher_update(fns);
1333 case OSSL_FUNC_CIPHER_FINAL:
1334 if (cipher->cfinal != NULL)
1336 cipher->cfinal = OSSL_get_OP_cipher_final(fns);
1339 case OSSL_FUNC_CIPHER_CIPHER:
1340 if (cipher->ccipher != NULL)
1342 cipher->ccipher = OSSL_get_OP_cipher_cipher(fns);
1344 case OSSL_FUNC_CIPHER_FREECTX:
1345 if (cipher->freectx != NULL)
1347 cipher->freectx = OSSL_get_OP_cipher_freectx(fns);
1350 case OSSL_FUNC_CIPHER_DUPCTX:
1351 if (cipher->dupctx != NULL)
1353 cipher->dupctx = OSSL_get_OP_cipher_dupctx(fns);
1355 case OSSL_FUNC_CIPHER_GET_PARAMS:
1356 if (cipher->get_params != NULL)
1358 cipher->get_params = OSSL_get_OP_cipher_get_params(fns);
1360 case OSSL_FUNC_CIPHER_GET_CTX_PARAMS:
1361 if (cipher->get_ctx_params != NULL)
1363 cipher->get_ctx_params = OSSL_get_OP_cipher_get_ctx_params(fns);
1365 case OSSL_FUNC_CIPHER_SET_CTX_PARAMS:
1366 if (cipher->set_ctx_params != NULL)
1368 cipher->set_ctx_params = OSSL_get_OP_cipher_set_ctx_params(fns);
1370 case OSSL_FUNC_CIPHER_GETTABLE_PARAMS:
1371 if (cipher->gettable_params != NULL)
1373 cipher->gettable_params = OSSL_get_OP_cipher_gettable_params(fns);
1375 case OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS:
1376 if (cipher->gettable_ctx_params != NULL)
1378 cipher->gettable_ctx_params =
1379 OSSL_get_OP_cipher_gettable_ctx_params(fns);
1381 case OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS:
1382 if (cipher->settable_ctx_params != NULL)
1384 cipher->settable_ctx_params =
1385 OSSL_get_OP_cipher_settable_ctx_params(fns);
1389 if ((fnciphcnt != 0 && fnciphcnt != 3 && fnciphcnt != 4)
1390 || (fnciphcnt == 0 && cipher->ccipher == NULL)
1393 * In order to be a consistent set of functions we must have at least
1394 * a complete set of "encrypt" functions, or a complete set of "decrypt"
1395 * functions, or a single "cipher" function. In all cases we need both
1396 * the "newctx" and "freectx" functions.
1398 EVP_CIPHER_free(cipher);
1399 EVPerr(EVP_F_EVP_CIPHER_FROM_DISPATCH, EVP_R_INVALID_PROVIDER_FUNCTIONS);
1402 cipher->prov = prov;
1404 ossl_provider_up_ref(prov);
1409 static int evp_cipher_up_ref(void *cipher)
1411 return EVP_CIPHER_up_ref(cipher);
1414 static void evp_cipher_free(void *cipher)
1416 EVP_CIPHER_free(cipher);
1419 EVP_CIPHER *EVP_CIPHER_fetch(OPENSSL_CTX *ctx, const char *algorithm,
1420 const char *properties)
1422 EVP_CIPHER *cipher =
1423 evp_generic_fetch(ctx, OSSL_OP_CIPHER, algorithm, properties,
1424 evp_cipher_from_dispatch, NULL, evp_cipher_up_ref,
1430 int EVP_CIPHER_up_ref(EVP_CIPHER *cipher)
1434 CRYPTO_UP_REF(&cipher->refcnt, &ref, cipher->lock);
1438 void EVP_CIPHER_free(EVP_CIPHER *cipher)
1445 CRYPTO_DOWN_REF(&cipher->refcnt, &i, cipher->lock);
1448 ossl_provider_free(cipher->prov);
1449 OPENSSL_free(cipher->name);
1450 CRYPTO_THREAD_lock_free(cipher->lock);
1451 OPENSSL_free(cipher);
1454 void EVP_CIPHER_do_all_ex(OPENSSL_CTX *libctx,
1455 void (*fn)(EVP_CIPHER *mac, void *arg),
1458 evp_generic_do_all(libctx, OSSL_OP_CIPHER,
1459 (void (*)(void *, void *))fn, arg,
1460 evp_cipher_from_dispatch, NULL, evp_cipher_free);