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 #ifndef OPENSSL_NO_ENGINE
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 EVP_CIPHER *provciph = NULL;
85 ENGINE *tmpimpl = NULL;
86 const EVP_CIPHER *tmpcipher;
89 * enc == 1 means we are encrypting.
90 * enc == 0 means we are decrypting.
91 * enc == -1 means, use the previously initialised value for encrypt/decrypt
101 if (cipher == NULL && ctx->cipher == NULL) {
102 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET);
106 /* TODO(3.0): Legacy work around code below. Remove this */
108 #ifndef OPENSSL_NO_ENGINE
110 * Whether it's nice or not, "Inits" can be used on "Final"'d contexts so
111 * this context may already have an ENGINE! Try to avoid releasing the
112 * previous handle, re-querying for an ENGINE, and having a
113 * reinitialisation, when it may all be unnecessary.
115 if (ctx->engine && ctx->cipher
116 && (cipher == NULL || cipher->nid == ctx->cipher->nid))
119 if (cipher != NULL && impl == NULL) {
120 /* Ask if an ENGINE is reserved for this job */
121 tmpimpl = ENGINE_get_cipher_engine(cipher->nid);
126 * If there are engines involved then we should use legacy handling for now.
128 if (ctx->engine != NULL
130 || tmpimpl != NULL) {
131 if (ctx->cipher == ctx->fetched_cipher)
133 EVP_CIPHER_meth_free(ctx->fetched_cipher);
134 ctx->fetched_cipher = NULL;
138 tmpcipher = (cipher == NULL) ? ctx->cipher : cipher;
140 if (tmpcipher->prov == NULL) {
141 switch(tmpcipher->nid) {
142 case NID_aes_256_ecb:
143 case NID_aes_192_ecb:
144 case NID_aes_128_ecb:
145 case NID_aes_256_cbc:
146 case NID_aes_192_cbc:
147 case NID_aes_128_cbc:
148 case NID_aes_256_ofb128:
149 case NID_aes_192_ofb128:
150 case NID_aes_128_ofb128:
151 case NID_aes_256_cfb128:
152 case NID_aes_192_cfb128:
153 case NID_aes_128_cfb128:
154 case NID_aes_256_cfb1:
155 case NID_aes_192_cfb1:
156 case NID_aes_128_cfb1:
157 case NID_aes_256_cfb8:
158 case NID_aes_192_cfb8:
159 case NID_aes_128_cfb8:
167 * Ensure a context left lying around from last time is cleared
170 if (cipher != NULL && ctx->cipher != NULL) {
171 OPENSSL_clear_free(ctx->cipher_data, ctx->cipher->ctx_size);
172 ctx->cipher_data = NULL;
176 /* TODO(3.0): Start of non-legacy code below */
178 /* Ensure a context left lying around from last time is cleared */
179 if (cipher != NULL && ctx->cipher != NULL) {
180 unsigned long flags = ctx->flags;
182 EVP_CIPHER_CTX_reset(ctx);
183 /* Restore encrypt and flags */
189 ctx->cipher = cipher;
191 cipher = ctx->cipher;
193 if (cipher->prov == NULL) {
194 provciph = EVP_CIPHER_fetch(NULL, OBJ_nid2sn(cipher->nid), "");
195 if (provciph == NULL) {
196 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
200 EVP_CIPHER_meth_free(ctx->fetched_cipher);
201 ctx->fetched_cipher = provciph;
204 ctx->cipher = cipher;
205 if (ctx->provctx == NULL) {
206 ctx->provctx = ctx->cipher->newctx();
207 if (ctx->provctx == NULL) {
208 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
213 if ((ctx->flags & EVP_CIPH_NO_PADDING) != 0) {
215 * If this ctx was already set up for no padding then we need to tell
216 * the new cipher about it.
218 if (!EVP_CIPHER_CTX_set_padding(ctx, 0))
222 switch (EVP_CIPHER_mode(ctx->cipher)) {
223 case EVP_CIPH_CFB_MODE:
224 case EVP_CIPH_OFB_MODE:
225 case EVP_CIPH_CBC_MODE:
226 /* For these modes we remember the original IV for later use */
227 if (!ossl_assert(EVP_CIPHER_CTX_iv_length(ctx) <= (int)sizeof(ctx->oiv))) {
228 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
232 memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
236 if (ctx->cipher->einit == NULL) {
237 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
241 return ctx->cipher->einit(ctx->provctx, key, iv);
244 if (ctx->cipher->dinit == NULL) {
245 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
249 return ctx->cipher->dinit(ctx->provctx, key, iv);
251 /* TODO(3.0): Remove legacy code below */
254 if (cipher != NULL) {
256 * Ensure a context left lying around from last time is cleared (we
257 * previously attempted to avoid this if the same ENGINE and
258 * EVP_CIPHER could be used).
261 unsigned long flags = ctx->flags;
262 EVP_CIPHER_CTX_reset(ctx);
263 /* Restore encrypt and flags */
267 #ifndef OPENSSL_NO_ENGINE
269 if (!ENGINE_init(impl)) {
270 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
277 /* There's an ENGINE for this job ... (apparently) */
278 const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid);
282 * One positive side-effect of US's export control history,
283 * is that we should at least be able to avoid using US
284 * misspellings of "initialisation"?
286 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
289 /* We'll use the ENGINE's private cipher definition */
292 * Store the ENGINE functional reference so we know 'cipher' came
293 * from an ENGINE and we need to release it when done.
301 ctx->cipher = cipher;
302 if (ctx->cipher->ctx_size) {
303 ctx->cipher_data = OPENSSL_zalloc(ctx->cipher->ctx_size);
304 if (ctx->cipher_data == NULL) {
306 EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE);
310 ctx->cipher_data = NULL;
312 ctx->key_len = cipher->key_len;
313 /* Preserve wrap enable flag, zero everything else */
314 ctx->flags &= EVP_CIPHER_CTX_FLAG_WRAP_ALLOW;
315 if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) {
316 if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) {
318 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
323 #ifndef OPENSSL_NO_ENGINE
326 /* we assume block size is a power of 2 in *cryptUpdate */
327 OPENSSL_assert(ctx->cipher->block_size == 1
328 || ctx->cipher->block_size == 8
329 || ctx->cipher->block_size == 16);
331 if (!(ctx->flags & EVP_CIPHER_CTX_FLAG_WRAP_ALLOW)
332 && EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_WRAP_MODE) {
333 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_WRAP_MODE_NOT_ALLOWED);
337 if (!(EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(ctx)) & EVP_CIPH_CUSTOM_IV)) {
338 switch (EVP_CIPHER_CTX_mode(ctx)) {
340 case EVP_CIPH_STREAM_CIPHER:
341 case EVP_CIPH_ECB_MODE:
344 case EVP_CIPH_CFB_MODE:
345 case EVP_CIPH_OFB_MODE:
350 case EVP_CIPH_CBC_MODE:
352 OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <=
353 (int)sizeof(ctx->iv));
355 memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
356 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
359 case EVP_CIPH_CTR_MODE:
361 /* Don't reuse IV for CTR mode */
363 memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx));
371 if (key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
372 if (!ctx->cipher->init(ctx, key, iv, enc))
377 ctx->block_mask = ctx->cipher->block_size - 1;
381 int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
382 const unsigned char *in, int inl)
385 return EVP_EncryptUpdate(ctx, out, outl, in, inl);
387 return EVP_DecryptUpdate(ctx, out, outl, in, inl);
390 int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
393 return EVP_EncryptFinal_ex(ctx, out, outl);
395 return EVP_DecryptFinal_ex(ctx, out, outl);
398 int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
401 return EVP_EncryptFinal(ctx, out, outl);
403 return EVP_DecryptFinal(ctx, out, outl);
406 int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
407 const unsigned char *key, const unsigned char *iv)
409 return EVP_CipherInit(ctx, cipher, key, iv, 1);
412 int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
413 ENGINE *impl, const unsigned char *key,
414 const unsigned char *iv)
416 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
419 int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
420 const unsigned char *key, const unsigned char *iv)
422 return EVP_CipherInit(ctx, cipher, key, iv, 0);
425 int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
426 ENGINE *impl, const unsigned char *key,
427 const unsigned char *iv)
429 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
433 * According to the letter of standard difference between pointers
434 * is specified to be valid only within same object. This makes
435 * it formally challenging to determine if input and output buffers
436 * are not partially overlapping with standard pointer arithmetic.
441 #if defined(OPENSSL_SYS_VMS) && __INITIAL_POINTER_SIZE==64
443 * Then we have VMS that distinguishes itself by adhering to
444 * sizeof(size_t)==4 even in 64-bit builds, which means that
445 * difference between two pointers might be truncated to 32 bits.
446 * In the context one can even wonder how comparison for
447 * equality is implemented. To be on the safe side we adhere to
448 * PTRDIFF_T even for comparison for equality.
450 # define PTRDIFF_T uint64_t
452 # define PTRDIFF_T size_t
455 int is_partially_overlapping(const void *ptr1, const void *ptr2, int len)
457 PTRDIFF_T diff = (PTRDIFF_T)ptr1-(PTRDIFF_T)ptr2;
459 * Check for partially overlapping buffers. [Binary logical
460 * operations are used instead of boolean to minimize number
461 * of conditional branches.]
463 int overlapped = (len > 0) & (diff != 0) & ((diff < (PTRDIFF_T)len) |
464 (diff > (0 - (PTRDIFF_T)len)));
469 static int evp_EncryptDecryptUpdate(EVP_CIPHER_CTX *ctx,
470 unsigned char *out, int *outl,
471 const unsigned char *in, int inl)
473 int i, j, bl, cmpl = inl;
475 if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
476 cmpl = (cmpl + 7) / 8;
478 bl = ctx->cipher->block_size;
485 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
486 /* If block size > 1 then the cipher will have to do this check */
487 if (bl == 1 && is_partially_overlapping(out, in, cmpl)) {
488 EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
492 i = ctx->cipher->do_cipher(ctx, out, in, inl);
500 if (is_partially_overlapping(out + ctx->buf_len, in, cmpl)) {
501 EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
505 if (ctx->buf_len == 0 && (inl & (ctx->block_mask)) == 0) {
506 if (ctx->cipher->do_cipher(ctx, out, in, inl)) {
515 OPENSSL_assert(bl <= (int)sizeof(ctx->buf));
518 memcpy(&(ctx->buf[i]), in, inl);
524 memcpy(&(ctx->buf[i]), in, j);
527 if (!ctx->cipher->do_cipher(ctx, out, ctx->buf, bl))
537 if (!ctx->cipher->do_cipher(ctx, out, in, inl))
543 memcpy(ctx->buf, &(in[inl]), i);
549 int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
550 const unsigned char *in, int inl)
555 /* Prevent accidental use of decryption context when encrypting */
557 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_INVALID_OPERATION);
561 if (ctx->cipher == NULL || ctx->cipher->prov == NULL)
564 if (ctx->cipher->cupdate == NULL) {
565 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR);
568 ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl, in, (size_t)inl);
570 if (soutl > INT_MAX) {
571 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR);
577 /* TODO(3.0): Remove legacy code below */
580 return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl);
583 int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
586 ret = EVP_EncryptFinal_ex(ctx, out, outl);
590 int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
593 unsigned int i, b, bl;
596 /* Prevent accidental use of decryption context when encrypting */
598 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_INVALID_OPERATION);
602 if (ctx->cipher == NULL || ctx->cipher->prov == NULL)
605 if (ctx->cipher->cfinal == NULL) {
606 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR);
610 ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl);
612 if (soutl > INT_MAX) {
613 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR);
620 /* TODO(3.0): Remove legacy code below */
623 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
624 ret = ctx->cipher->do_cipher(ctx, out, NULL, 0);
632 b = ctx->cipher->block_size;
633 OPENSSL_assert(b <= sizeof(ctx->buf));
639 if (ctx->flags & EVP_CIPH_NO_PADDING) {
641 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,
642 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
650 for (i = bl; i < b; i++)
652 ret = ctx->cipher->do_cipher(ctx, out, ctx->buf, b);
660 int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
661 const unsigned char *in, int inl)
663 int fix_len, cmpl = inl, ret;
667 /* Prevent accidental use of encryption context when decrypting */
669 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_INVALID_OPERATION);
673 if (ctx->cipher == NULL || ctx->cipher->prov == NULL)
676 if (ctx->cipher->cupdate == NULL) {
677 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR);
680 ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl, in, (size_t)inl);
683 if (soutl > INT_MAX) {
684 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR);
692 /* TODO(3.0): Remove legacy code below */
695 b = ctx->cipher->block_size;
697 if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
698 cmpl = (cmpl + 7) / 8;
705 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
706 if (b == 1 && is_partially_overlapping(out, in, cmpl)) {
707 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
711 fix_len = ctx->cipher->do_cipher(ctx, out, in, inl);
720 if (ctx->flags & EVP_CIPH_NO_PADDING)
721 return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl);
723 OPENSSL_assert(b <= sizeof(ctx->final));
725 if (ctx->final_used) {
726 /* see comment about PTRDIFF_T comparison above */
727 if (((PTRDIFF_T)out == (PTRDIFF_T)in)
728 || is_partially_overlapping(out, in, b)) {
729 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
732 memcpy(out, ctx->final, b);
738 if (!evp_EncryptDecryptUpdate(ctx, out, outl, in, inl))
742 * if we have 'decrypted' a multiple of block size, make sure we have a
743 * copy of this last block
745 if (b > 1 && !ctx->buf_len) {
748 memcpy(ctx->final, &out[*outl], b);
758 int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
761 ret = EVP_DecryptFinal_ex(ctx, out, outl);
765 int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
772 /* Prevent accidental use of encryption context when decrypting */
774 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_INVALID_OPERATION);
778 if (ctx->cipher == NULL || ctx->cipher->prov == NULL)
781 if (ctx->cipher->cfinal == NULL) {
782 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR);
786 ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl);
789 if (soutl > INT_MAX) {
790 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR);
798 /* TODO(3.0): Remove legacy code below */
803 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
804 i = ctx->cipher->do_cipher(ctx, out, NULL, 0);
812 b = ctx->cipher->block_size;
813 if (ctx->flags & EVP_CIPH_NO_PADDING) {
815 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,
816 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
823 if (ctx->buf_len || !ctx->final_used) {
824 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_WRONG_FINAL_BLOCK_LENGTH);
827 OPENSSL_assert(b <= sizeof(ctx->final));
830 * The following assumes that the ciphertext has been authenticated.
831 * Otherwise it provides a padding oracle.
833 n = ctx->final[b - 1];
834 if (n == 0 || n > (int)b) {
835 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
838 for (i = 0; i < n; i++) {
839 if (ctx->final[--b] != n) {
840 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
844 n = ctx->cipher->block_size - n;
845 for (i = 0; i < n; i++)
846 out[i] = ctx->final[i];
853 int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
855 if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
856 return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
857 if (EVP_CIPHER_CTX_key_length(c) == keylen)
859 if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) {
863 EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH, EVP_R_INVALID_KEY_LENGTH);
867 int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
870 ctx->flags &= ~EVP_CIPH_NO_PADDING;
872 ctx->flags |= EVP_CIPH_NO_PADDING;
874 if (ctx->cipher != NULL && ctx->cipher->prov != NULL) {
875 OSSL_PARAM params[] = {
876 OSSL_PARAM_int(OSSL_CIPHER_PARAM_PADDING, NULL),
880 params[0].data = &pad;
882 if (ctx->cipher->ctx_set_params == NULL) {
883 EVPerr(EVP_F_EVP_CIPHER_CTX_SET_PADDING, EVP_R_CTRL_NOT_IMPLEMENTED);
887 if (!ctx->cipher->ctx_set_params(ctx->provctx, params))
894 int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
899 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
903 if (!ctx->cipher->ctrl) {
904 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
908 ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
910 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL,
911 EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
917 int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key)
919 if (ctx->cipher->flags & EVP_CIPH_RAND_KEY)
920 return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key);
921 if (RAND_priv_bytes(key, ctx->key_len) <= 0)
926 int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in)
928 if ((in == NULL) || (in->cipher == NULL)) {
929 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INPUT_NOT_INITIALIZED);
933 if (in->cipher->prov == NULL)
936 if (in->cipher->dupctx == NULL) {
937 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX);
941 EVP_CIPHER_CTX_reset(out);
946 if (in->fetched_cipher != NULL && !EVP_CIPHER_upref(in->fetched_cipher)) {
947 out->fetched_cipher = NULL;
951 out->provctx = in->cipher->dupctx(in->provctx);
952 if (out->provctx == NULL) {
953 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX);
959 /* TODO(3.0): Remove legacy code below */
962 #ifndef OPENSSL_NO_ENGINE
963 /* Make sure it's safe to copy a cipher context using an ENGINE */
964 if (in->engine && !ENGINE_init(in->engine)) {
965 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_ENGINE_LIB);
970 EVP_CIPHER_CTX_reset(out);
971 memcpy(out, in, sizeof(*out));
973 if (in->cipher_data && in->cipher->ctx_size) {
974 out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size);
975 if (out->cipher_data == NULL) {
977 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_MALLOC_FAILURE);
980 memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size);
983 if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY)
984 if (!in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out)) {
986 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INITIALIZATION_ERROR);
992 static void *evp_cipher_from_dispatch(int nid, const OSSL_DISPATCH *fns,
995 EVP_CIPHER *cipher = NULL;
996 int fnciphcnt = 0, fnctxcnt = 0;
998 if ((cipher = EVP_CIPHER_meth_new(nid, 0, 0)) == NULL)
1001 for (; fns->function_id != 0; fns++) {
1002 switch (fns->function_id) {
1003 case OSSL_FUNC_CIPHER_NEWCTX:
1004 if (cipher->newctx != NULL)
1006 cipher->newctx = OSSL_get_OP_cipher_newctx(fns);
1009 case OSSL_FUNC_CIPHER_ENCRYPT_INIT:
1010 if (cipher->einit != NULL)
1012 cipher->einit = OSSL_get_OP_cipher_encrypt_init(fns);
1015 case OSSL_FUNC_CIPHER_DECRYPT_INIT:
1016 if (cipher->dinit != NULL)
1018 cipher->dinit = OSSL_get_OP_cipher_decrypt_init(fns);
1021 case OSSL_FUNC_CIPHER_UPDATE:
1022 if (cipher->cupdate != NULL)
1024 cipher->cupdate = OSSL_get_OP_cipher_update(fns);
1027 case OSSL_FUNC_CIPHER_FINAL:
1028 if (cipher->cfinal != NULL)
1030 cipher->cfinal = OSSL_get_OP_cipher_final(fns);
1033 case OSSL_FUNC_CIPHER_CIPHER:
1034 if (cipher->ccipher != NULL)
1036 cipher->ccipher = OSSL_get_OP_cipher_cipher(fns);
1038 case OSSL_FUNC_CIPHER_FREECTX:
1039 if (cipher->freectx != NULL)
1041 cipher->freectx = OSSL_get_OP_cipher_freectx(fns);
1044 case OSSL_FUNC_CIPHER_DUPCTX:
1045 if (cipher->dupctx != NULL)
1047 cipher->dupctx = OSSL_get_OP_cipher_dupctx(fns);
1049 case OSSL_FUNC_CIPHER_KEY_LENGTH:
1050 if (cipher->key_length != NULL)
1052 cipher->key_length = OSSL_get_OP_cipher_key_length(fns);
1054 case OSSL_FUNC_CIPHER_IV_LENGTH:
1055 if (cipher->iv_length != NULL)
1057 cipher->iv_length = OSSL_get_OP_cipher_iv_length(fns);
1059 case OSSL_FUNC_CIPHER_BLOCK_SIZE:
1060 if (cipher->blocksize != NULL)
1062 cipher->blocksize = OSSL_get_OP_cipher_block_size(fns);
1064 case OSSL_FUNC_CIPHER_GET_PARAMS:
1065 if (cipher->get_params != NULL)
1067 cipher->get_params = OSSL_get_OP_cipher_get_params(fns);
1069 case OSSL_FUNC_CIPHER_CTX_GET_PARAMS:
1070 if (cipher->ctx_get_params != NULL)
1072 cipher->ctx_get_params = OSSL_get_OP_cipher_ctx_get_params(fns);
1074 case OSSL_FUNC_CIPHER_CTX_SET_PARAMS:
1075 if (cipher->ctx_set_params != NULL)
1077 cipher->ctx_set_params = OSSL_get_OP_cipher_ctx_set_params(fns);
1081 if ((fnciphcnt != 0 && fnciphcnt != 3 && fnciphcnt != 4)
1082 || (fnciphcnt == 0 && cipher->ccipher == NULL)
1085 * In order to be a consistent set of functions we must have at least
1086 * a complete set of "encrypt" functions, or a complete set of "decrypt"
1087 * functions, or a single "cipher" function. In all cases we need a
1088 * complete set of context management functions
1090 EVP_CIPHER_meth_free(cipher);
1091 EVPerr(EVP_F_EVP_CIPHER_FROM_DISPATCH, EVP_R_INVALID_PROVIDER_FUNCTIONS);
1094 cipher->prov = prov;
1096 ossl_provider_upref(prov);
1101 static int evp_cipher_upref(void *cipher)
1103 return EVP_CIPHER_upref(cipher);
1106 static void evp_cipher_free(void *cipher)
1108 EVP_CIPHER_meth_free(cipher);
1111 static int evp_cipher_nid(void *vcipher)
1113 EVP_CIPHER *cipher = vcipher;
1118 EVP_CIPHER *EVP_CIPHER_fetch(OPENSSL_CTX *ctx, const char *algorithm,
1119 const char *properties)
1121 return evp_generic_fetch(ctx, OSSL_OP_CIPHER, algorithm, properties,
1122 evp_cipher_from_dispatch, evp_cipher_upref,
1123 evp_cipher_free, evp_cipher_nid);