2 * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
12 #include "internal/cryptlib.h"
13 #include <openssl/evp.h>
14 #include <openssl/err.h>
15 #include <openssl/rand.h>
16 #include <openssl/rand_drbg.h>
17 #include <openssl/engine.h>
18 #include <openssl/params.h>
19 #include <openssl/core_names.h>
20 #include "internal/evp_int.h"
21 #include "internal/provider.h"
24 int EVP_CIPHER_CTX_reset(EVP_CIPHER_CTX *ctx)
29 if (ctx->cipher == NULL || ctx->cipher->prov == NULL)
32 if (ctx->provctx != NULL) {
33 if (ctx->cipher->freectx != NULL)
34 ctx->cipher->freectx(ctx->provctx);
37 if (ctx->fetched_cipher != NULL)
38 EVP_CIPHER_meth_free(ctx->fetched_cipher);
39 memset(ctx, 0, sizeof(*ctx));
43 /* TODO(3.0): Remove legacy code below */
46 if (ctx->cipher != NULL) {
47 if (ctx->cipher->cleanup && !ctx->cipher->cleanup(ctx))
49 /* Cleanse cipher context data */
50 if (ctx->cipher_data && ctx->cipher->ctx_size)
51 OPENSSL_cleanse(ctx->cipher_data, ctx->cipher->ctx_size);
53 OPENSSL_free(ctx->cipher_data);
54 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
55 ENGINE_finish(ctx->engine);
57 memset(ctx, 0, sizeof(*ctx));
61 EVP_CIPHER_CTX *EVP_CIPHER_CTX_new(void)
63 return OPENSSL_zalloc(sizeof(EVP_CIPHER_CTX));
66 void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx)
68 EVP_CIPHER_CTX_reset(ctx);
72 int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
73 const unsigned char *key, const unsigned char *iv, int enc)
76 EVP_CIPHER_CTX_reset(ctx);
77 return EVP_CipherInit_ex(ctx, cipher, NULL, key, iv, enc);
80 int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
81 ENGINE *impl, const unsigned char *key,
82 const unsigned char *iv, int enc)
84 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
85 ENGINE *tmpimpl = NULL;
87 const EVP_CIPHER *tmpcipher;
90 * enc == 1 means we are encrypting.
91 * enc == 0 means we are decrypting.
92 * enc == -1 means, use the previously initialised value for encrypt/decrypt
102 if (cipher == NULL && ctx->cipher == NULL) {
103 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET);
107 /* TODO(3.0): Legacy work around code below. Remove this */
109 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
111 * Whether it's nice or not, "Inits" can be used on "Final"'d contexts so
112 * this context may already have an ENGINE! Try to avoid releasing the
113 * previous handle, re-querying for an ENGINE, and having a
114 * reinitialisation, when it may all be unnecessary.
116 if (ctx->engine && ctx->cipher
117 && (cipher == NULL || cipher->nid == ctx->cipher->nid))
120 if (cipher != NULL && impl == NULL) {
121 /* Ask if an ENGINE is reserved for this job */
122 tmpimpl = ENGINE_get_cipher_engine(cipher->nid);
127 * If there are engines involved then we should use legacy handling for now.
129 if (ctx->engine != NULL
130 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
134 if (ctx->cipher == ctx->fetched_cipher)
136 EVP_CIPHER_meth_free(ctx->fetched_cipher);
137 ctx->fetched_cipher = NULL;
141 tmpcipher = (cipher == NULL) ? ctx->cipher : cipher;
143 if (tmpcipher->prov == NULL) {
144 switch(tmpcipher->nid) {
145 case NID_aes_256_ecb:
146 case NID_aes_192_ecb:
147 case NID_aes_128_ecb:
148 case NID_aes_256_cbc:
149 case NID_aes_192_cbc:
150 case NID_aes_128_cbc:
151 case NID_aes_256_ofb128:
152 case NID_aes_192_ofb128:
153 case NID_aes_128_ofb128:
154 case NID_aes_256_cfb128:
155 case NID_aes_192_cfb128:
156 case NID_aes_128_cfb128:
157 case NID_aes_256_cfb1:
158 case NID_aes_192_cfb1:
159 case NID_aes_128_cfb1:
160 case NID_aes_256_cfb8:
161 case NID_aes_192_cfb8:
162 case NID_aes_128_cfb8:
163 case NID_aes_256_ctr:
164 case NID_aes_192_ctr:
165 case NID_aes_128_ctr:
173 * Ensure a context left lying around from last time is cleared
176 if (cipher != NULL && ctx->cipher != NULL) {
177 OPENSSL_clear_free(ctx->cipher_data, ctx->cipher->ctx_size);
178 ctx->cipher_data = NULL;
182 /* TODO(3.0): Start of non-legacy code below */
184 /* Ensure a context left lying around from last time is cleared */
185 if (cipher != NULL && ctx->cipher != NULL) {
186 unsigned long flags = ctx->flags;
188 EVP_CIPHER_CTX_reset(ctx);
189 /* Restore encrypt and flags */
195 ctx->cipher = cipher;
197 cipher = ctx->cipher;
199 if (cipher->prov == NULL) {
201 /* We only do explict fetches inside the FIPS module */
202 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
205 EVP_CIPHER *provciph =
206 EVP_CIPHER_fetch(NULL, OBJ_nid2sn(cipher->nid), "");
208 if (provciph == NULL) {
209 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
213 EVP_CIPHER_meth_free(ctx->fetched_cipher);
214 ctx->fetched_cipher = provciph;
218 ctx->cipher = cipher;
219 if (ctx->provctx == NULL) {
220 ctx->provctx = ctx->cipher->newctx(ossl_provider_ctx(cipher->prov));
221 if (ctx->provctx == NULL) {
222 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
227 if ((ctx->flags & EVP_CIPH_NO_PADDING) != 0) {
229 * If this ctx was already set up for no padding then we need to tell
230 * the new cipher about it.
232 if (!EVP_CIPHER_CTX_set_padding(ctx, 0))
236 switch (EVP_CIPHER_mode(ctx->cipher)) {
237 case EVP_CIPH_CFB_MODE:
238 case EVP_CIPH_OFB_MODE:
239 case EVP_CIPH_CBC_MODE:
240 /* For these modes we remember the original IV for later use */
241 if (!ossl_assert(EVP_CIPHER_CTX_iv_length(ctx) <= (int)sizeof(ctx->oiv))) {
242 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
246 memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
250 if (ctx->cipher->einit == NULL) {
251 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
255 return ctx->cipher->einit(ctx->provctx,
258 : EVP_CIPHER_CTX_key_length(ctx),
261 : EVP_CIPHER_CTX_iv_length(ctx));
264 if (ctx->cipher->dinit == NULL) {
265 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
269 return ctx->cipher->dinit(ctx->provctx,
272 : EVP_CIPHER_CTX_key_length(ctx),
275 : EVP_CIPHER_CTX_iv_length(ctx));
277 /* TODO(3.0): Remove legacy code below */
280 if (cipher != NULL) {
282 * Ensure a context left lying around from last time is cleared (we
283 * previously attempted to avoid this if the same ENGINE and
284 * EVP_CIPHER could be used).
287 unsigned long flags = ctx->flags;
288 EVP_CIPHER_CTX_reset(ctx);
289 /* Restore encrypt and flags */
293 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
295 if (!ENGINE_init(impl)) {
296 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
303 /* There's an ENGINE for this job ... (apparently) */
304 const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid);
308 * One positive side-effect of US's export control history,
309 * is that we should at least be able to avoid using US
310 * misspellings of "initialisation"?
312 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
315 /* We'll use the ENGINE's private cipher definition */
318 * Store the ENGINE functional reference so we know 'cipher' came
319 * from an ENGINE and we need to release it when done.
327 ctx->cipher = cipher;
328 if (ctx->cipher->ctx_size) {
329 ctx->cipher_data = OPENSSL_zalloc(ctx->cipher->ctx_size);
330 if (ctx->cipher_data == NULL) {
332 EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE);
336 ctx->cipher_data = NULL;
338 ctx->key_len = cipher->key_len;
339 /* Preserve wrap enable flag, zero everything else */
340 ctx->flags &= EVP_CIPHER_CTX_FLAG_WRAP_ALLOW;
341 if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) {
342 if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) {
344 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
349 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
352 if (ctx->cipher == NULL)
355 /* we assume block size is a power of 2 in *cryptUpdate */
356 OPENSSL_assert(ctx->cipher->block_size == 1
357 || ctx->cipher->block_size == 8
358 || ctx->cipher->block_size == 16);
360 if (!(ctx->flags & EVP_CIPHER_CTX_FLAG_WRAP_ALLOW)
361 && EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_WRAP_MODE) {
362 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_WRAP_MODE_NOT_ALLOWED);
366 if (!(EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(ctx)) & EVP_CIPH_CUSTOM_IV)) {
367 switch (EVP_CIPHER_CTX_mode(ctx)) {
369 case EVP_CIPH_STREAM_CIPHER:
370 case EVP_CIPH_ECB_MODE:
373 case EVP_CIPH_CFB_MODE:
374 case EVP_CIPH_OFB_MODE:
379 case EVP_CIPH_CBC_MODE:
381 OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <=
382 (int)sizeof(ctx->iv));
384 memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
385 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
388 case EVP_CIPH_CTR_MODE:
390 /* Don't reuse IV for CTR mode */
392 memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx));
400 if (key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
401 if (!ctx->cipher->init(ctx, key, iv, enc))
406 ctx->block_mask = ctx->cipher->block_size - 1;
410 int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
411 const unsigned char *in, int inl)
414 return EVP_EncryptUpdate(ctx, out, outl, in, inl);
416 return EVP_DecryptUpdate(ctx, out, outl, in, inl);
419 int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
422 return EVP_EncryptFinal_ex(ctx, out, outl);
424 return EVP_DecryptFinal_ex(ctx, out, outl);
427 int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
430 return EVP_EncryptFinal(ctx, out, outl);
432 return EVP_DecryptFinal(ctx, out, outl);
435 int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
436 const unsigned char *key, const unsigned char *iv)
438 return EVP_CipherInit(ctx, cipher, key, iv, 1);
441 int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
442 ENGINE *impl, const unsigned char *key,
443 const unsigned char *iv)
445 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
448 int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
449 const unsigned char *key, const unsigned char *iv)
451 return EVP_CipherInit(ctx, cipher, key, iv, 0);
454 int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
455 ENGINE *impl, const unsigned char *key,
456 const unsigned char *iv)
458 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
462 * According to the letter of standard difference between pointers
463 * is specified to be valid only within same object. This makes
464 * it formally challenging to determine if input and output buffers
465 * are not partially overlapping with standard pointer arithmetic.
470 #if defined(OPENSSL_SYS_VMS) && __INITIAL_POINTER_SIZE==64
472 * Then we have VMS that distinguishes itself by adhering to
473 * sizeof(size_t)==4 even in 64-bit builds, which means that
474 * difference between two pointers might be truncated to 32 bits.
475 * In the context one can even wonder how comparison for
476 * equality is implemented. To be on the safe side we adhere to
477 * PTRDIFF_T even for comparison for equality.
479 # define PTRDIFF_T uint64_t
481 # define PTRDIFF_T size_t
484 int is_partially_overlapping(const void *ptr1, const void *ptr2, int len)
486 PTRDIFF_T diff = (PTRDIFF_T)ptr1-(PTRDIFF_T)ptr2;
488 * Check for partially overlapping buffers. [Binary logical
489 * operations are used instead of boolean to minimize number
490 * of conditional branches.]
492 int overlapped = (len > 0) & (diff != 0) & ((diff < (PTRDIFF_T)len) |
493 (diff > (0 - (PTRDIFF_T)len)));
498 static int evp_EncryptDecryptUpdate(EVP_CIPHER_CTX *ctx,
499 unsigned char *out, int *outl,
500 const unsigned char *in, int inl)
502 int i, j, bl, cmpl = inl;
504 if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
505 cmpl = (cmpl + 7) / 8;
507 bl = ctx->cipher->block_size;
509 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
510 /* If block size > 1 then the cipher will have to do this check */
511 if (bl == 1 && is_partially_overlapping(out, in, cmpl)) {
512 EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
516 i = ctx->cipher->do_cipher(ctx, out, in, inl);
528 if (is_partially_overlapping(out + ctx->buf_len, in, cmpl)) {
529 EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
533 if (ctx->buf_len == 0 && (inl & (ctx->block_mask)) == 0) {
534 if (ctx->cipher->do_cipher(ctx, out, in, inl)) {
543 OPENSSL_assert(bl <= (int)sizeof(ctx->buf));
546 memcpy(&(ctx->buf[i]), in, inl);
552 memcpy(&(ctx->buf[i]), in, j);
555 if (!ctx->cipher->do_cipher(ctx, out, ctx->buf, bl))
565 if (!ctx->cipher->do_cipher(ctx, out, in, inl))
571 memcpy(ctx->buf, &(in[inl]), i);
577 int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
578 const unsigned char *in, int inl)
584 /* Prevent accidental use of decryption context when encrypting */
586 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_INVALID_OPERATION);
590 if (ctx->cipher == NULL) {
591 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_NO_CIPHER_SET);
595 if (ctx->cipher->prov == NULL)
598 blocksize = EVP_CIPHER_CTX_block_size(ctx);
600 if (ctx->cipher->cupdate == NULL || blocksize < 1) {
601 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR);
604 ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl,
605 inl + (blocksize == 1 ? 0 : blocksize), in,
609 if (soutl > INT_MAX) {
610 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR);
618 /* TODO(3.0): Remove legacy code below */
621 return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl);
624 int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
627 ret = EVP_EncryptFinal_ex(ctx, out, outl);
631 int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
634 unsigned int i, b, bl;
638 /* Prevent accidental use of decryption context when encrypting */
640 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_INVALID_OPERATION);
644 if (ctx->cipher == NULL) {
645 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_NO_CIPHER_SET);
648 if (ctx->cipher->prov == NULL)
651 blocksize = EVP_CIPHER_CTX_block_size(ctx);
653 if (blocksize < 1 || ctx->cipher->cfinal == NULL) {
654 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR);
658 ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl,
659 blocksize == 1 ? 0 : blocksize);
662 if (soutl > INT_MAX) {
663 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR);
671 /* TODO(3.0): Remove legacy code below */
674 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
675 ret = ctx->cipher->do_cipher(ctx, out, NULL, 0);
683 b = ctx->cipher->block_size;
684 OPENSSL_assert(b <= sizeof(ctx->buf));
690 if (ctx->flags & EVP_CIPH_NO_PADDING) {
692 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,
693 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
701 for (i = bl; i < b; i++)
703 ret = ctx->cipher->do_cipher(ctx, out, ctx->buf, b);
711 int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
712 const unsigned char *in, int inl)
714 int fix_len, cmpl = inl, ret;
719 /* Prevent accidental use of encryption context when decrypting */
721 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_INVALID_OPERATION);
725 if (ctx->cipher == NULL) {
726 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_NO_CIPHER_SET);
729 if (ctx->cipher->prov == NULL)
732 blocksize = EVP_CIPHER_CTX_block_size(ctx);
734 if (ctx->cipher->cupdate == NULL || blocksize < 1) {
735 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR);
738 ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl,
739 inl + (blocksize == 1 ? 0 : blocksize), in,
743 if (soutl > INT_MAX) {
744 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR);
752 /* TODO(3.0): Remove legacy code below */
755 b = ctx->cipher->block_size;
757 if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
758 cmpl = (cmpl + 7) / 8;
760 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
761 if (b == 1 && is_partially_overlapping(out, in, cmpl)) {
762 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
766 fix_len = ctx->cipher->do_cipher(ctx, out, in, inl);
780 if (ctx->flags & EVP_CIPH_NO_PADDING)
781 return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl);
783 OPENSSL_assert(b <= sizeof(ctx->final));
785 if (ctx->final_used) {
786 /* see comment about PTRDIFF_T comparison above */
787 if (((PTRDIFF_T)out == (PTRDIFF_T)in)
788 || is_partially_overlapping(out, in, b)) {
789 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
792 memcpy(out, ctx->final, b);
798 if (!evp_EncryptDecryptUpdate(ctx, out, outl, in, inl))
802 * if we have 'decrypted' a multiple of block size, make sure we have a
803 * copy of this last block
805 if (b > 1 && !ctx->buf_len) {
808 memcpy(ctx->final, &out[*outl], b);
818 int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
821 ret = EVP_DecryptFinal_ex(ctx, out, outl);
825 int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
833 /* Prevent accidental use of encryption context when decrypting */
835 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_INVALID_OPERATION);
839 if (ctx->cipher == NULL) {
840 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_NO_CIPHER_SET);
844 if (ctx->cipher->prov == NULL)
847 blocksize = EVP_CIPHER_CTX_block_size(ctx);
849 if (blocksize < 1 || ctx->cipher->cfinal == NULL) {
850 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR);
854 ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl,
855 blocksize == 1 ? 0 : blocksize);
858 if (soutl > INT_MAX) {
859 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR);
867 /* TODO(3.0): Remove legacy code below */
871 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
872 i = ctx->cipher->do_cipher(ctx, out, NULL, 0);
880 b = ctx->cipher->block_size;
881 if (ctx->flags & EVP_CIPH_NO_PADDING) {
883 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,
884 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
891 if (ctx->buf_len || !ctx->final_used) {
892 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_WRONG_FINAL_BLOCK_LENGTH);
895 OPENSSL_assert(b <= sizeof(ctx->final));
898 * The following assumes that the ciphertext has been authenticated.
899 * Otherwise it provides a padding oracle.
901 n = ctx->final[b - 1];
902 if (n == 0 || n > (int)b) {
903 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
906 for (i = 0; i < n; i++) {
907 if (ctx->final[--b] != n) {
908 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
912 n = ctx->cipher->block_size - n;
913 for (i = 0; i < n; i++)
914 out[i] = ctx->final[i];
921 int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
923 if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
924 return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
925 if (EVP_CIPHER_CTX_key_length(c) == keylen)
927 if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) {
931 EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH, EVP_R_INVALID_KEY_LENGTH);
935 int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
938 ctx->flags &= ~EVP_CIPH_NO_PADDING;
940 ctx->flags |= EVP_CIPH_NO_PADDING;
942 if (ctx->cipher != NULL && ctx->cipher->prov != NULL) {
943 OSSL_PARAM params[] = {
944 OSSL_PARAM_int(OSSL_CIPHER_PARAM_PADDING, NULL),
948 params[0].data = &pad;
950 if (ctx->cipher->ctx_set_params == NULL) {
951 EVPerr(EVP_F_EVP_CIPHER_CTX_SET_PADDING, EVP_R_CTRL_NOT_IMPLEMENTED);
955 if (!ctx->cipher->ctx_set_params(ctx->provctx, params))
962 int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
967 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
971 if (!ctx->cipher->ctrl) {
972 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
976 ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
978 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL,
979 EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
985 #if !defined(FIPS_MODE)
986 /* TODO(3.0): No support for RAND yet in the FIPS module */
987 int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key)
990 if (ctx->cipher->flags & EVP_CIPH_RAND_KEY)
991 return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key);
992 kl = EVP_CIPHER_CTX_key_length(ctx);
993 if (kl <= 0 || RAND_priv_bytes(key, kl) <= 0)
999 int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in)
1001 if ((in == NULL) || (in->cipher == NULL)) {
1002 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INPUT_NOT_INITIALIZED);
1006 if (in->cipher->prov == NULL)
1009 if (in->cipher->dupctx == NULL) {
1010 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX);
1014 EVP_CIPHER_CTX_reset(out);
1017 out->provctx = NULL;
1019 if (in->fetched_cipher != NULL && !EVP_CIPHER_upref(in->fetched_cipher)) {
1020 out->fetched_cipher = NULL;
1024 out->provctx = in->cipher->dupctx(in->provctx);
1025 if (out->provctx == NULL) {
1026 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX);
1032 /* TODO(3.0): Remove legacy code below */
1035 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
1036 /* Make sure it's safe to copy a cipher context using an ENGINE */
1037 if (in->engine && !ENGINE_init(in->engine)) {
1038 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_ENGINE_LIB);
1043 EVP_CIPHER_CTX_reset(out);
1044 memcpy(out, in, sizeof(*out));
1046 if (in->cipher_data && in->cipher->ctx_size) {
1047 out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size);
1048 if (out->cipher_data == NULL) {
1050 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_MALLOC_FAILURE);
1053 memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size);
1056 if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY)
1057 if (!in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out)) {
1059 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INITIALIZATION_ERROR);
1065 static void *evp_cipher_from_dispatch(const OSSL_DISPATCH *fns,
1066 OSSL_PROVIDER *prov)
1068 EVP_CIPHER *cipher = NULL;
1069 int fnciphcnt = 0, fnctxcnt = 0;
1072 * The legacy NID is set by EVP_CIPHER_fetch() if the name exists in
1073 * the object database.
1075 if ((cipher = EVP_CIPHER_meth_new(0, 0, 0)) == NULL)
1078 for (; fns->function_id != 0; fns++) {
1079 switch (fns->function_id) {
1080 case OSSL_FUNC_CIPHER_NEWCTX:
1081 if (cipher->newctx != NULL)
1083 cipher->newctx = OSSL_get_OP_cipher_newctx(fns);
1086 case OSSL_FUNC_CIPHER_ENCRYPT_INIT:
1087 if (cipher->einit != NULL)
1089 cipher->einit = OSSL_get_OP_cipher_encrypt_init(fns);
1092 case OSSL_FUNC_CIPHER_DECRYPT_INIT:
1093 if (cipher->dinit != NULL)
1095 cipher->dinit = OSSL_get_OP_cipher_decrypt_init(fns);
1098 case OSSL_FUNC_CIPHER_UPDATE:
1099 if (cipher->cupdate != NULL)
1101 cipher->cupdate = OSSL_get_OP_cipher_update(fns);
1104 case OSSL_FUNC_CIPHER_FINAL:
1105 if (cipher->cfinal != NULL)
1107 cipher->cfinal = OSSL_get_OP_cipher_final(fns);
1110 case OSSL_FUNC_CIPHER_CIPHER:
1111 if (cipher->ccipher != NULL)
1113 cipher->ccipher = OSSL_get_OP_cipher_cipher(fns);
1115 case OSSL_FUNC_CIPHER_FREECTX:
1116 if (cipher->freectx != NULL)
1118 cipher->freectx = OSSL_get_OP_cipher_freectx(fns);
1121 case OSSL_FUNC_CIPHER_DUPCTX:
1122 if (cipher->dupctx != NULL)
1124 cipher->dupctx = OSSL_get_OP_cipher_dupctx(fns);
1126 case OSSL_FUNC_CIPHER_KEY_LENGTH:
1127 if (cipher->key_length != NULL)
1129 cipher->key_length = OSSL_get_OP_cipher_key_length(fns);
1131 case OSSL_FUNC_CIPHER_IV_LENGTH:
1132 if (cipher->iv_length != NULL)
1134 cipher->iv_length = OSSL_get_OP_cipher_iv_length(fns);
1136 case OSSL_FUNC_CIPHER_BLOCK_SIZE:
1137 if (cipher->blocksize != NULL)
1139 cipher->blocksize = OSSL_get_OP_cipher_block_size(fns);
1141 case OSSL_FUNC_CIPHER_GET_PARAMS:
1142 if (cipher->get_params != NULL)
1144 cipher->get_params = OSSL_get_OP_cipher_get_params(fns);
1146 case OSSL_FUNC_CIPHER_CTX_GET_PARAMS:
1147 if (cipher->ctx_get_params != NULL)
1149 cipher->ctx_get_params = OSSL_get_OP_cipher_ctx_get_params(fns);
1151 case OSSL_FUNC_CIPHER_CTX_SET_PARAMS:
1152 if (cipher->ctx_set_params != NULL)
1154 cipher->ctx_set_params = OSSL_get_OP_cipher_ctx_set_params(fns);
1158 if ((fnciphcnt != 0 && fnciphcnt != 3 && fnciphcnt != 4)
1159 || (fnciphcnt == 0 && cipher->ccipher == NULL)
1161 || cipher->blocksize == NULL
1162 || cipher->iv_length == NULL
1163 || cipher->key_length == NULL) {
1165 * In order to be a consistent set of functions we must have at least
1166 * a complete set of "encrypt" functions, or a complete set of "decrypt"
1167 * functions, or a single "cipher" function. In all cases we need a
1168 * complete set of context management functions, as well as the
1169 * blocksize, iv_length and key_length functions.
1171 EVP_CIPHER_meth_free(cipher);
1172 EVPerr(EVP_F_EVP_CIPHER_FROM_DISPATCH, EVP_R_INVALID_PROVIDER_FUNCTIONS);
1175 cipher->prov = prov;
1177 ossl_provider_upref(prov);
1182 static int evp_cipher_upref(void *cipher)
1184 return EVP_CIPHER_upref(cipher);
1187 static void evp_cipher_free(void *cipher)
1189 EVP_CIPHER_meth_free(cipher);
1192 EVP_CIPHER *EVP_CIPHER_fetch(OPENSSL_CTX *ctx, const char *algorithm,
1193 const char *properties)
1195 EVP_CIPHER *cipher =
1196 evp_generic_fetch(ctx, OSSL_OP_CIPHER, algorithm, properties,
1197 evp_cipher_from_dispatch, evp_cipher_upref,
1201 /* TODO(3.x) get rid of the need for legacy NIDs */
1202 if (cipher != NULL) {
1204 * FIPS module note: since internal fetches will be entirely
1205 * provider based, we know that none of its code depends on legacy
1206 * NIDs or any functionality that use them.
1208 cipher->nid = OBJ_sn2nid(algorithm);