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:
155 * Ensure a context left lying around from last time is cleared
158 if (cipher != NULL && ctx->cipher != NULL) {
159 OPENSSL_clear_free(ctx->cipher_data, ctx->cipher->ctx_size);
160 ctx->cipher_data = NULL;
164 /* TODO(3.0): Start of non-legacy code below */
166 /* Ensure a context left lying around from last time is cleared */
167 if (cipher != NULL && ctx->cipher != NULL) {
168 unsigned long flags = ctx->flags;
170 EVP_CIPHER_CTX_reset(ctx);
171 /* Restore encrypt and flags */
177 ctx->cipher = cipher;
179 cipher = ctx->cipher;
181 if (cipher->prov == NULL) {
182 provciph = EVP_CIPHER_fetch(NULL, OBJ_nid2sn(cipher->nid), "");
183 if (provciph == NULL) {
184 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
188 EVP_CIPHER_meth_free(ctx->fetched_cipher);
189 ctx->fetched_cipher = provciph;
192 ctx->cipher = cipher;
193 if (ctx->provctx == NULL) {
194 ctx->provctx = ctx->cipher->newctx();
195 if (ctx->provctx == NULL) {
196 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
201 if ((ctx->flags & EVP_CIPH_NO_PADDING) != 0) {
203 * If this ctx was already set up for no padding then we need to tell
204 * the new cipher about it.
206 if (!EVP_CIPHER_CTX_set_padding(ctx, 0))
210 switch (EVP_CIPHER_mode(ctx->cipher)) {
211 case EVP_CIPH_CFB_MODE:
212 case EVP_CIPH_OFB_MODE:
213 case EVP_CIPH_CBC_MODE:
214 /* For these modes we remember the original IV for later use */
215 if (!ossl_assert(EVP_CIPHER_CTX_iv_length(ctx) <= (int)sizeof(ctx->oiv))) {
216 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
220 memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
224 if (ctx->cipher->einit == NULL) {
225 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
229 return ctx->cipher->einit(ctx->provctx, key, iv);
232 if (ctx->cipher->dinit == NULL) {
233 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
237 return ctx->cipher->dinit(ctx->provctx, key, iv);
239 /* TODO(3.0): Remove legacy code below */
242 if (cipher != NULL) {
244 * Ensure a context left lying around from last time is cleared (we
245 * previously attempted to avoid this if the same ENGINE and
246 * EVP_CIPHER could be used).
249 unsigned long flags = ctx->flags;
250 EVP_CIPHER_CTX_reset(ctx);
251 /* Restore encrypt and flags */
255 #ifndef OPENSSL_NO_ENGINE
257 if (!ENGINE_init(impl)) {
258 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
265 /* There's an ENGINE for this job ... (apparently) */
266 const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid);
270 * One positive side-effect of US's export control history,
271 * is that we should at least be able to avoid using US
272 * misspellings of "initialisation"?
274 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
277 /* We'll use the ENGINE's private cipher definition */
280 * Store the ENGINE functional reference so we know 'cipher' came
281 * from an ENGINE and we need to release it when done.
289 ctx->cipher = cipher;
290 if (ctx->cipher->ctx_size) {
291 ctx->cipher_data = OPENSSL_zalloc(ctx->cipher->ctx_size);
292 if (ctx->cipher_data == NULL) {
294 EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE);
298 ctx->cipher_data = NULL;
300 ctx->key_len = cipher->key_len;
301 /* Preserve wrap enable flag, zero everything else */
302 ctx->flags &= EVP_CIPHER_CTX_FLAG_WRAP_ALLOW;
303 if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) {
304 if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) {
306 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
311 #ifndef OPENSSL_NO_ENGINE
314 /* we assume block size is a power of 2 in *cryptUpdate */
315 OPENSSL_assert(ctx->cipher->block_size == 1
316 || ctx->cipher->block_size == 8
317 || ctx->cipher->block_size == 16);
319 if (!(ctx->flags & EVP_CIPHER_CTX_FLAG_WRAP_ALLOW)
320 && EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_WRAP_MODE) {
321 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_WRAP_MODE_NOT_ALLOWED);
325 if (!(EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(ctx)) & EVP_CIPH_CUSTOM_IV)) {
326 switch (EVP_CIPHER_CTX_mode(ctx)) {
328 case EVP_CIPH_STREAM_CIPHER:
329 case EVP_CIPH_ECB_MODE:
332 case EVP_CIPH_CFB_MODE:
333 case EVP_CIPH_OFB_MODE:
338 case EVP_CIPH_CBC_MODE:
340 OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <=
341 (int)sizeof(ctx->iv));
343 memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
344 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
347 case EVP_CIPH_CTR_MODE:
349 /* Don't reuse IV for CTR mode */
351 memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx));
359 if (key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
360 if (!ctx->cipher->init(ctx, key, iv, enc))
365 ctx->block_mask = ctx->cipher->block_size - 1;
369 int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
370 const unsigned char *in, int inl)
373 return EVP_EncryptUpdate(ctx, out, outl, in, inl);
375 return EVP_DecryptUpdate(ctx, out, outl, in, inl);
378 int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
381 return EVP_EncryptFinal_ex(ctx, out, outl);
383 return EVP_DecryptFinal_ex(ctx, out, outl);
386 int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
389 return EVP_EncryptFinal(ctx, out, outl);
391 return EVP_DecryptFinal(ctx, out, outl);
394 int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
395 const unsigned char *key, const unsigned char *iv)
397 return EVP_CipherInit(ctx, cipher, key, iv, 1);
400 int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
401 ENGINE *impl, const unsigned char *key,
402 const unsigned char *iv)
404 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
407 int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
408 const unsigned char *key, const unsigned char *iv)
410 return EVP_CipherInit(ctx, cipher, key, iv, 0);
413 int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
414 ENGINE *impl, const unsigned char *key,
415 const unsigned char *iv)
417 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
421 * According to the letter of standard difference between pointers
422 * is specified to be valid only within same object. This makes
423 * it formally challenging to determine if input and output buffers
424 * are not partially overlapping with standard pointer arithmetic.
429 #if defined(OPENSSL_SYS_VMS) && __INITIAL_POINTER_SIZE==64
431 * Then we have VMS that distinguishes itself by adhering to
432 * sizeof(size_t)==4 even in 64-bit builds, which means that
433 * difference between two pointers might be truncated to 32 bits.
434 * In the context one can even wonder how comparison for
435 * equality is implemented. To be on the safe side we adhere to
436 * PTRDIFF_T even for comparison for equality.
438 # define PTRDIFF_T uint64_t
440 # define PTRDIFF_T size_t
443 int is_partially_overlapping(const void *ptr1, const void *ptr2, int len)
445 PTRDIFF_T diff = (PTRDIFF_T)ptr1-(PTRDIFF_T)ptr2;
447 * Check for partially overlapping buffers. [Binary logical
448 * operations are used instead of boolean to minimize number
449 * of conditional branches.]
451 int overlapped = (len > 0) & (diff != 0) & ((diff < (PTRDIFF_T)len) |
452 (diff > (0 - (PTRDIFF_T)len)));
457 static int evp_EncryptDecryptUpdate(EVP_CIPHER_CTX *ctx,
458 unsigned char *out, int *outl,
459 const unsigned char *in, int inl)
461 int i, j, bl, cmpl = inl;
463 if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
464 cmpl = (cmpl + 7) / 8;
466 bl = ctx->cipher->block_size;
473 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
474 /* If block size > 1 then the cipher will have to do this check */
475 if (bl == 1 && is_partially_overlapping(out, in, cmpl)) {
476 EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
480 i = ctx->cipher->do_cipher(ctx, out, in, inl);
488 if (is_partially_overlapping(out + ctx->buf_len, in, cmpl)) {
489 EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
493 if (ctx->buf_len == 0 && (inl & (ctx->block_mask)) == 0) {
494 if (ctx->cipher->do_cipher(ctx, out, in, inl)) {
503 OPENSSL_assert(bl <= (int)sizeof(ctx->buf));
506 memcpy(&(ctx->buf[i]), in, inl);
512 memcpy(&(ctx->buf[i]), in, j);
515 if (!ctx->cipher->do_cipher(ctx, out, ctx->buf, bl))
525 if (!ctx->cipher->do_cipher(ctx, out, in, inl))
531 memcpy(ctx->buf, &(in[inl]), i);
537 int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
538 const unsigned char *in, int inl)
543 /* Prevent accidental use of decryption context when encrypting */
545 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_INVALID_OPERATION);
549 if (ctx->cipher == NULL || ctx->cipher->prov == NULL)
552 if (ctx->cipher->cupdate == NULL) {
553 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR);
556 ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl, in, (size_t)inl);
558 if (soutl > INT_MAX) {
559 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR);
565 /* TODO(3.0): Remove legacy code below */
568 return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl);
571 int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
574 ret = EVP_EncryptFinal_ex(ctx, out, outl);
578 int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
581 unsigned int i, b, bl;
584 /* Prevent accidental use of decryption context when encrypting */
586 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_INVALID_OPERATION);
590 if (ctx->cipher == NULL || ctx->cipher->prov == NULL)
593 if (ctx->cipher->cfinal == NULL) {
594 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR);
598 ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl);
600 if (soutl > INT_MAX) {
601 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR);
608 /* TODO(3.0): Remove legacy code below */
611 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
612 ret = ctx->cipher->do_cipher(ctx, out, NULL, 0);
620 b = ctx->cipher->block_size;
621 OPENSSL_assert(b <= sizeof(ctx->buf));
627 if (ctx->flags & EVP_CIPH_NO_PADDING) {
629 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,
630 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
638 for (i = bl; i < b; i++)
640 ret = ctx->cipher->do_cipher(ctx, out, ctx->buf, b);
648 int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
649 const unsigned char *in, int inl)
651 int fix_len, cmpl = inl, ret;
655 /* Prevent accidental use of encryption context when decrypting */
657 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_INVALID_OPERATION);
661 if (ctx->cipher == NULL || ctx->cipher->prov == NULL)
664 if (ctx->cipher->cupdate == NULL) {
665 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR);
668 ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl, in, (size_t)inl);
671 if (soutl > INT_MAX) {
672 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR);
680 /* TODO(3.0): Remove legacy code below */
683 b = ctx->cipher->block_size;
685 if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
686 cmpl = (cmpl + 7) / 8;
693 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
694 if (b == 1 && is_partially_overlapping(out, in, cmpl)) {
695 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
699 fix_len = ctx->cipher->do_cipher(ctx, out, in, inl);
708 if (ctx->flags & EVP_CIPH_NO_PADDING)
709 return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl);
711 OPENSSL_assert(b <= sizeof(ctx->final));
713 if (ctx->final_used) {
714 /* see comment about PTRDIFF_T comparison above */
715 if (((PTRDIFF_T)out == (PTRDIFF_T)in)
716 || is_partially_overlapping(out, in, b)) {
717 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
720 memcpy(out, ctx->final, b);
726 if (!evp_EncryptDecryptUpdate(ctx, out, outl, in, inl))
730 * if we have 'decrypted' a multiple of block size, make sure we have a
731 * copy of this last block
733 if (b > 1 && !ctx->buf_len) {
736 memcpy(ctx->final, &out[*outl], b);
746 int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
749 ret = EVP_DecryptFinal_ex(ctx, out, outl);
753 int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
760 /* Prevent accidental use of encryption context when decrypting */
762 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_INVALID_OPERATION);
766 if (ctx->cipher == NULL || ctx->cipher->prov == NULL)
769 if (ctx->cipher->cfinal == NULL) {
770 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR);
774 ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl);
777 if (soutl > INT_MAX) {
778 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR);
786 /* TODO(3.0): Remove legacy code below */
791 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
792 i = ctx->cipher->do_cipher(ctx, out, NULL, 0);
800 b = ctx->cipher->block_size;
801 if (ctx->flags & EVP_CIPH_NO_PADDING) {
803 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,
804 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
811 if (ctx->buf_len || !ctx->final_used) {
812 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_WRONG_FINAL_BLOCK_LENGTH);
815 OPENSSL_assert(b <= sizeof(ctx->final));
818 * The following assumes that the ciphertext has been authenticated.
819 * Otherwise it provides a padding oracle.
821 n = ctx->final[b - 1];
822 if (n == 0 || n > (int)b) {
823 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
826 for (i = 0; i < n; i++) {
827 if (ctx->final[--b] != n) {
828 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
832 n = ctx->cipher->block_size - n;
833 for (i = 0; i < n; i++)
834 out[i] = ctx->final[i];
841 int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
843 if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
844 return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
845 if (EVP_CIPHER_CTX_key_length(c) == keylen)
847 if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) {
851 EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH, EVP_R_INVALID_KEY_LENGTH);
855 int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
858 ctx->flags &= ~EVP_CIPH_NO_PADDING;
860 ctx->flags |= EVP_CIPH_NO_PADDING;
862 if (ctx->cipher != NULL && ctx->cipher->prov != NULL) {
863 OSSL_PARAM params[] = {
864 OSSL_PARAM_int(OSSL_CIPHER_PARAM_PADDING, NULL),
868 params[0].data = &pad;
870 if (ctx->cipher->ctx_set_params == NULL) {
871 EVPerr(EVP_F_EVP_CIPHER_CTX_SET_PADDING, EVP_R_CTRL_NOT_IMPLEMENTED);
875 if (!ctx->cipher->ctx_set_params(ctx->provctx, params))
882 int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
887 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
891 if (!ctx->cipher->ctrl) {
892 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
896 ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
898 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL,
899 EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
905 int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key)
907 if (ctx->cipher->flags & EVP_CIPH_RAND_KEY)
908 return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key);
909 if (RAND_priv_bytes(key, ctx->key_len) <= 0)
914 int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in)
916 if ((in == NULL) || (in->cipher == NULL)) {
917 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INPUT_NOT_INITIALIZED);
921 if (in->cipher->prov == NULL)
924 if (in->cipher->dupctx == NULL) {
925 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX);
929 EVP_CIPHER_CTX_reset(out);
934 if (in->fetched_cipher != NULL && !EVP_CIPHER_upref(in->fetched_cipher)) {
935 out->fetched_cipher = NULL;
939 out->provctx = in->cipher->dupctx(in->provctx);
940 if (out->provctx == NULL) {
941 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX);
947 /* TODO(3.0): Remove legacy code below */
950 #ifndef OPENSSL_NO_ENGINE
951 /* Make sure it's safe to copy a cipher context using an ENGINE */
952 if (in->engine && !ENGINE_init(in->engine)) {
953 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_ENGINE_LIB);
958 EVP_CIPHER_CTX_reset(out);
959 memcpy(out, in, sizeof(*out));
961 if (in->cipher_data && in->cipher->ctx_size) {
962 out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size);
963 if (out->cipher_data == NULL) {
965 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_MALLOC_FAILURE);
968 memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size);
971 if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY)
972 if (!in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out)) {
974 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INITIALIZATION_ERROR);
980 static void *evp_cipher_from_dispatch(int nid, const OSSL_DISPATCH *fns,
983 EVP_CIPHER *cipher = NULL;
984 int fnciphcnt = 0, fnctxcnt = 0;
986 if ((cipher = EVP_CIPHER_meth_new(nid, 0, 0)) == NULL)
989 for (; fns->function_id != 0; fns++) {
990 switch (fns->function_id) {
991 case OSSL_FUNC_CIPHER_NEWCTX:
992 if (cipher->newctx != NULL)
994 cipher->newctx = OSSL_get_OP_cipher_newctx(fns);
997 case OSSL_FUNC_CIPHER_ENCRYPT_INIT:
998 if (cipher->einit != NULL)
1000 cipher->einit = OSSL_get_OP_cipher_encrypt_init(fns);
1003 case OSSL_FUNC_CIPHER_DECRYPT_INIT:
1004 if (cipher->dinit != NULL)
1006 cipher->dinit = OSSL_get_OP_cipher_decrypt_init(fns);
1009 case OSSL_FUNC_CIPHER_UPDATE:
1010 if (cipher->cupdate != NULL)
1012 cipher->cupdate = OSSL_get_OP_cipher_update(fns);
1015 case OSSL_FUNC_CIPHER_FINAL:
1016 if (cipher->cfinal != NULL)
1018 cipher->cfinal = OSSL_get_OP_cipher_final(fns);
1021 case OSSL_FUNC_CIPHER_CIPHER:
1022 if (cipher->ccipher != NULL)
1024 cipher->ccipher = OSSL_get_OP_cipher_cipher(fns);
1026 case OSSL_FUNC_CIPHER_FREECTX:
1027 if (cipher->freectx != NULL)
1029 cipher->freectx = OSSL_get_OP_cipher_freectx(fns);
1032 case OSSL_FUNC_CIPHER_DUPCTX:
1033 if (cipher->dupctx != NULL)
1035 cipher->dupctx = OSSL_get_OP_cipher_dupctx(fns);
1037 case OSSL_FUNC_CIPHER_KEY_LENGTH:
1038 if (cipher->key_length != NULL)
1040 cipher->key_length = OSSL_get_OP_cipher_key_length(fns);
1042 case OSSL_FUNC_CIPHER_IV_LENGTH:
1043 if (cipher->iv_length != NULL)
1045 cipher->iv_length = OSSL_get_OP_cipher_iv_length(fns);
1047 case OSSL_FUNC_CIPHER_BLOCK_SIZE:
1048 if (cipher->blocksize != NULL)
1050 cipher->blocksize = OSSL_get_OP_cipher_block_size(fns);
1052 case OSSL_FUNC_CIPHER_GET_PARAMS:
1053 if (cipher->get_params != NULL)
1055 cipher->get_params = OSSL_get_OP_cipher_get_params(fns);
1057 case OSSL_FUNC_CIPHER_CTX_GET_PARAMS:
1058 if (cipher->ctx_get_params != NULL)
1060 cipher->ctx_get_params = OSSL_get_OP_cipher_ctx_get_params(fns);
1062 case OSSL_FUNC_CIPHER_CTX_SET_PARAMS:
1063 if (cipher->ctx_set_params != NULL)
1065 cipher->ctx_set_params = OSSL_get_OP_cipher_ctx_set_params(fns);
1069 if ((fnciphcnt != 0 && fnciphcnt != 3 && fnciphcnt != 4)
1070 || (fnciphcnt == 0 && cipher->ccipher == NULL)
1073 * In order to be a consistent set of functions we must have at least
1074 * a complete set of "encrypt" functions, or a complete set of "decrypt"
1075 * functions, or a single "cipher" function. In all cases we need a
1076 * complete set of context management functions
1078 EVP_CIPHER_meth_free(cipher);
1079 EVPerr(EVP_F_EVP_CIPHER_FROM_DISPATCH, EVP_R_INVALID_PROVIDER_FUNCTIONS);
1082 cipher->prov = prov;
1084 ossl_provider_upref(prov);
1089 static int evp_cipher_upref(void *cipher)
1091 return EVP_CIPHER_upref(cipher);
1094 static void evp_cipher_free(void *cipher)
1096 EVP_CIPHER_meth_free(cipher);
1099 static int evp_cipher_nid(void *vcipher)
1101 EVP_CIPHER *cipher = vcipher;
1106 EVP_CIPHER *EVP_CIPHER_fetch(OPENSSL_CTX *ctx, const char *algorithm,
1107 const char *properties)
1109 return evp_generic_fetch(ctx, OSSL_OP_CIPHER, algorithm, properties,
1110 evp_cipher_from_dispatch, evp_cipher_upref,
1111 evp_cipher_free, evp_cipher_nid);