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:
152 * Ensure a context left lying around from last time is cleared
155 if (cipher != NULL && ctx->cipher != NULL) {
156 OPENSSL_clear_free(ctx->cipher_data, ctx->cipher->ctx_size);
157 ctx->cipher_data = NULL;
161 /* TODO(3.0): Start of non-legacy code below */
163 /* Ensure a context left lying around from last time is cleared */
164 if (cipher != NULL && ctx->cipher != NULL) {
165 unsigned long flags = ctx->flags;
167 EVP_CIPHER_CTX_reset(ctx);
168 /* Restore encrypt and flags */
174 ctx->cipher = cipher;
176 cipher = ctx->cipher;
178 if (cipher->prov == NULL) {
179 provciph = EVP_CIPHER_fetch(NULL, OBJ_nid2sn(cipher->nid), "");
180 if (provciph == NULL) {
181 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
185 EVP_CIPHER_meth_free(ctx->fetched_cipher);
186 ctx->fetched_cipher = provciph;
189 ctx->cipher = cipher;
190 if (ctx->provctx == NULL) {
191 ctx->provctx = ctx->cipher->newctx();
192 if (ctx->provctx == NULL) {
193 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
198 if ((ctx->flags & EVP_CIPH_NO_PADDING) != 0) {
200 * If this ctx was already set up for no padding then we need to tell
201 * the new cipher about it.
203 if (!EVP_CIPHER_CTX_set_padding(ctx, 0))
208 if (ctx->cipher->einit == NULL) {
209 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
213 return ctx->cipher->einit(ctx->provctx, key, iv);
216 if (ctx->cipher->dinit == NULL) {
217 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
221 return ctx->cipher->dinit(ctx->provctx, key, iv);
223 /* TODO(3.0): Remove legacy code below */
226 if (cipher != NULL) {
228 * Ensure a context left lying around from last time is cleared (we
229 * previously attempted to avoid this if the same ENGINE and
230 * EVP_CIPHER could be used).
233 unsigned long flags = ctx->flags;
234 EVP_CIPHER_CTX_reset(ctx);
235 /* Restore encrypt and flags */
239 #ifndef OPENSSL_NO_ENGINE
241 if (!ENGINE_init(impl)) {
242 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
249 /* There's an ENGINE for this job ... (apparently) */
250 const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid);
254 * One positive side-effect of US's export control history,
255 * is that we should at least be able to avoid using US
256 * misspellings of "initialisation"?
258 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
261 /* We'll use the ENGINE's private cipher definition */
264 * Store the ENGINE functional reference so we know 'cipher' came
265 * from an ENGINE and we need to release it when done.
273 ctx->cipher = cipher;
274 if (ctx->cipher->ctx_size) {
275 ctx->cipher_data = OPENSSL_zalloc(ctx->cipher->ctx_size);
276 if (ctx->cipher_data == NULL) {
278 EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE);
282 ctx->cipher_data = NULL;
284 ctx->key_len = cipher->key_len;
285 /* Preserve wrap enable flag, zero everything else */
286 ctx->flags &= EVP_CIPHER_CTX_FLAG_WRAP_ALLOW;
287 if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) {
288 if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) {
290 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
295 #ifndef OPENSSL_NO_ENGINE
298 /* we assume block size is a power of 2 in *cryptUpdate */
299 OPENSSL_assert(ctx->cipher->block_size == 1
300 || ctx->cipher->block_size == 8
301 || ctx->cipher->block_size == 16);
303 if (!(ctx->flags & EVP_CIPHER_CTX_FLAG_WRAP_ALLOW)
304 && EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_WRAP_MODE) {
305 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_WRAP_MODE_NOT_ALLOWED);
309 if (!(EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(ctx)) & EVP_CIPH_CUSTOM_IV)) {
310 switch (EVP_CIPHER_CTX_mode(ctx)) {
312 case EVP_CIPH_STREAM_CIPHER:
313 case EVP_CIPH_ECB_MODE:
316 case EVP_CIPH_CFB_MODE:
317 case EVP_CIPH_OFB_MODE:
322 case EVP_CIPH_CBC_MODE:
324 OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <=
325 (int)sizeof(ctx->iv));
327 memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
328 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
331 case EVP_CIPH_CTR_MODE:
333 /* Don't reuse IV for CTR mode */
335 memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx));
343 if (key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
344 if (!ctx->cipher->init(ctx, key, iv, enc))
349 ctx->block_mask = ctx->cipher->block_size - 1;
353 int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
354 const unsigned char *in, int inl)
357 return EVP_EncryptUpdate(ctx, out, outl, in, inl);
359 return EVP_DecryptUpdate(ctx, out, outl, in, inl);
362 int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
365 return EVP_EncryptFinal_ex(ctx, out, outl);
367 return EVP_DecryptFinal_ex(ctx, out, outl);
370 int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
373 return EVP_EncryptFinal(ctx, out, outl);
375 return EVP_DecryptFinal(ctx, out, outl);
378 int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
379 const unsigned char *key, const unsigned char *iv)
381 return EVP_CipherInit(ctx, cipher, key, iv, 1);
384 int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
385 ENGINE *impl, const unsigned char *key,
386 const unsigned char *iv)
388 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
391 int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
392 const unsigned char *key, const unsigned char *iv)
394 return EVP_CipherInit(ctx, cipher, key, iv, 0);
397 int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
398 ENGINE *impl, const unsigned char *key,
399 const unsigned char *iv)
401 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
405 * According to the letter of standard difference between pointers
406 * is specified to be valid only within same object. This makes
407 * it formally challenging to determine if input and output buffers
408 * are not partially overlapping with standard pointer arithmetic.
413 #if defined(OPENSSL_SYS_VMS) && __INITIAL_POINTER_SIZE==64
415 * Then we have VMS that distinguishes itself by adhering to
416 * sizeof(size_t)==4 even in 64-bit builds, which means that
417 * difference between two pointers might be truncated to 32 bits.
418 * In the context one can even wonder how comparison for
419 * equality is implemented. To be on the safe side we adhere to
420 * PTRDIFF_T even for comparison for equality.
422 # define PTRDIFF_T uint64_t
424 # define PTRDIFF_T size_t
427 int is_partially_overlapping(const void *ptr1, const void *ptr2, int len)
429 PTRDIFF_T diff = (PTRDIFF_T)ptr1-(PTRDIFF_T)ptr2;
431 * Check for partially overlapping buffers. [Binary logical
432 * operations are used instead of boolean to minimize number
433 * of conditional branches.]
435 int overlapped = (len > 0) & (diff != 0) & ((diff < (PTRDIFF_T)len) |
436 (diff > (0 - (PTRDIFF_T)len)));
441 static int evp_EncryptDecryptUpdate(EVP_CIPHER_CTX *ctx,
442 unsigned char *out, int *outl,
443 const unsigned char *in, int inl)
445 int i, j, bl, cmpl = inl;
447 if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
448 cmpl = (cmpl + 7) / 8;
450 bl = ctx->cipher->block_size;
457 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
458 /* If block size > 1 then the cipher will have to do this check */
459 if (bl == 1 && is_partially_overlapping(out, in, cmpl)) {
460 EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
464 i = ctx->cipher->do_cipher(ctx, out, in, inl);
472 if (is_partially_overlapping(out + ctx->buf_len, in, cmpl)) {
473 EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
477 if (ctx->buf_len == 0 && (inl & (ctx->block_mask)) == 0) {
478 if (ctx->cipher->do_cipher(ctx, out, in, inl)) {
487 OPENSSL_assert(bl <= (int)sizeof(ctx->buf));
490 memcpy(&(ctx->buf[i]), in, inl);
496 memcpy(&(ctx->buf[i]), in, j);
499 if (!ctx->cipher->do_cipher(ctx, out, ctx->buf, bl))
509 if (!ctx->cipher->do_cipher(ctx, out, in, inl))
515 memcpy(ctx->buf, &(in[inl]), i);
521 int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
522 const unsigned char *in, int inl)
527 /* Prevent accidental use of decryption context when encrypting */
529 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_INVALID_OPERATION);
533 if (ctx->cipher == NULL || ctx->cipher->prov == NULL)
536 if (ctx->cipher->cupdate == NULL) {
537 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR);
540 ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl, in, (size_t)inl);
542 if (soutl > INT_MAX) {
543 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR);
549 /* TODO(3.0): Remove legacy code below */
552 return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl);
555 int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
558 ret = EVP_EncryptFinal_ex(ctx, out, outl);
562 int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
565 unsigned int i, b, bl;
568 /* Prevent accidental use of decryption context when encrypting */
570 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_INVALID_OPERATION);
574 if (ctx->cipher == NULL || ctx->cipher->prov == NULL)
577 if (ctx->cipher->cfinal == NULL) {
578 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR);
582 ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl);
584 if (soutl > INT_MAX) {
585 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR);
592 /* TODO(3.0): Remove legacy code below */
595 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
596 ret = ctx->cipher->do_cipher(ctx, out, NULL, 0);
604 b = ctx->cipher->block_size;
605 OPENSSL_assert(b <= sizeof(ctx->buf));
611 if (ctx->flags & EVP_CIPH_NO_PADDING) {
613 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,
614 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
622 for (i = bl; i < b; i++)
624 ret = ctx->cipher->do_cipher(ctx, out, ctx->buf, b);
632 int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
633 const unsigned char *in, int inl)
635 int fix_len, cmpl = inl, ret;
639 /* Prevent accidental use of encryption context when decrypting */
641 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_INVALID_OPERATION);
645 if (ctx->cipher == NULL || ctx->cipher->prov == NULL)
648 if (ctx->cipher->cupdate == NULL) {
649 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR);
652 ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl, in, (size_t)inl);
655 if (soutl > INT_MAX) {
656 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR);
664 /* TODO(3.0): Remove legacy code below */
667 b = ctx->cipher->block_size;
669 if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
670 cmpl = (cmpl + 7) / 8;
677 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
678 if (b == 1 && is_partially_overlapping(out, in, cmpl)) {
679 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
683 fix_len = ctx->cipher->do_cipher(ctx, out, in, inl);
692 if (ctx->flags & EVP_CIPH_NO_PADDING)
693 return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl);
695 OPENSSL_assert(b <= sizeof(ctx->final));
697 if (ctx->final_used) {
698 /* see comment about PTRDIFF_T comparison above */
699 if (((PTRDIFF_T)out == (PTRDIFF_T)in)
700 || is_partially_overlapping(out, in, b)) {
701 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
704 memcpy(out, ctx->final, b);
710 if (!evp_EncryptDecryptUpdate(ctx, out, outl, in, inl))
714 * if we have 'decrypted' a multiple of block size, make sure we have a
715 * copy of this last block
717 if (b > 1 && !ctx->buf_len) {
720 memcpy(ctx->final, &out[*outl], b);
730 int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
733 ret = EVP_DecryptFinal_ex(ctx, out, outl);
737 int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
744 /* Prevent accidental use of encryption context when decrypting */
746 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_INVALID_OPERATION);
750 if (ctx->cipher == NULL || ctx->cipher->prov == NULL)
753 if (ctx->cipher->cfinal == NULL) {
754 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR);
758 ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl);
761 if (soutl > INT_MAX) {
762 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR);
770 /* TODO(3.0): Remove legacy code below */
775 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
776 i = ctx->cipher->do_cipher(ctx, out, NULL, 0);
784 b = ctx->cipher->block_size;
785 if (ctx->flags & EVP_CIPH_NO_PADDING) {
787 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,
788 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
795 if (ctx->buf_len || !ctx->final_used) {
796 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_WRONG_FINAL_BLOCK_LENGTH);
799 OPENSSL_assert(b <= sizeof(ctx->final));
802 * The following assumes that the ciphertext has been authenticated.
803 * Otherwise it provides a padding oracle.
805 n = ctx->final[b - 1];
806 if (n == 0 || n > (int)b) {
807 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
810 for (i = 0; i < n; i++) {
811 if (ctx->final[--b] != n) {
812 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
816 n = ctx->cipher->block_size - n;
817 for (i = 0; i < n; i++)
818 out[i] = ctx->final[i];
825 int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
827 if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
828 return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
829 if (EVP_CIPHER_CTX_key_length(c) == keylen)
831 if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) {
835 EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH, EVP_R_INVALID_KEY_LENGTH);
839 int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
842 ctx->flags &= ~EVP_CIPH_NO_PADDING;
844 ctx->flags |= EVP_CIPH_NO_PADDING;
846 if (ctx->cipher != NULL && ctx->cipher->prov != NULL) {
847 OSSL_PARAM params[] = {
848 OSSL_PARAM_int(OSSL_CIPHER_PARAM_PADDING, NULL),
852 params[0].data = &pad;
854 if (ctx->cipher->set_params == NULL) {
855 EVPerr(EVP_F_EVP_CIPHER_CTX_SET_PADDING, EVP_R_CTRL_NOT_IMPLEMENTED);
859 if (!ctx->cipher->set_params(ctx->provctx, params))
866 int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
871 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
875 if (!ctx->cipher->ctrl) {
876 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
880 ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
882 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL,
883 EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
889 int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key)
891 if (ctx->cipher->flags & EVP_CIPH_RAND_KEY)
892 return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key);
893 if (RAND_priv_bytes(key, ctx->key_len) <= 0)
898 int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in)
900 if ((in == NULL) || (in->cipher == NULL)) {
901 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INPUT_NOT_INITIALIZED);
905 if (in->cipher->prov == NULL)
908 if (in->cipher->dupctx == NULL) {
909 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX);
913 EVP_CIPHER_CTX_reset(out);
918 if (in->fetched_cipher != NULL || !EVP_CIPHER_upref(in->fetched_cipher)) {
919 out->fetched_cipher = NULL;
923 out->provctx = in->cipher->dupctx(in->provctx);
924 if (out->provctx == NULL) {
925 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX);
931 /* TODO(3.0): Remove legacy code below */
934 #ifndef OPENSSL_NO_ENGINE
935 /* Make sure it's safe to copy a cipher context using an ENGINE */
936 if (in->engine && !ENGINE_init(in->engine)) {
937 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_ENGINE_LIB);
942 EVP_CIPHER_CTX_reset(out);
943 memcpy(out, in, sizeof(*out));
945 if (in->cipher_data && in->cipher->ctx_size) {
946 out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size);
947 if (out->cipher_data == NULL) {
949 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_MALLOC_FAILURE);
952 memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size);
955 if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY)
956 if (!in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out)) {
958 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INITIALIZATION_ERROR);
964 static void *evp_cipher_from_dispatch(int nid, const OSSL_DISPATCH *fns,
967 EVP_CIPHER *cipher = NULL;
968 int fnciphcnt = 0, fnctxcnt = 0;
970 if ((cipher = EVP_CIPHER_meth_new(nid, 0, 0)) == NULL)
973 for (; fns->function_id != 0; fns++) {
974 switch (fns->function_id) {
975 case OSSL_FUNC_CIPHER_NEWCTX:
976 if (cipher->newctx != NULL)
978 cipher->newctx = OSSL_get_OP_cipher_newctx(fns);
981 case OSSL_FUNC_CIPHER_ENCRYPT_INIT:
982 if (cipher->einit != NULL)
984 cipher->einit = OSSL_get_OP_cipher_encrypt_init(fns);
987 case OSSL_FUNC_CIPHER_DECRYPT_INIT:
988 if (cipher->dinit != NULL)
990 cipher->dinit = OSSL_get_OP_cipher_decrypt_init(fns);
993 case OSSL_FUNC_CIPHER_UPDATE:
994 if (cipher->cupdate != NULL)
996 cipher->cupdate = OSSL_get_OP_cipher_update(fns);
999 case OSSL_FUNC_CIPHER_FINAL:
1000 if (cipher->cfinal != NULL)
1002 cipher->cfinal = OSSL_get_OP_cipher_final(fns);
1005 case OSSL_FUNC_CIPHER_FREECTX:
1006 if (cipher->freectx != NULL)
1008 cipher->freectx = OSSL_get_OP_cipher_freectx(fns);
1011 case OSSL_FUNC_CIPHER_DUPCTX:
1012 if (cipher->dupctx != NULL)
1014 cipher->dupctx = OSSL_get_OP_cipher_dupctx(fns);
1016 case OSSL_FUNC_CIPHER_KEY_LENGTH:
1017 if (cipher->key_length != NULL)
1019 cipher->key_length = OSSL_get_OP_cipher_key_length(fns);
1021 case OSSL_FUNC_CIPHER_GET_PARAMS:
1022 if (cipher->get_params != NULL)
1024 cipher->get_params = OSSL_get_OP_cipher_get_params(fns);
1026 case OSSL_FUNC_CIPHER_SET_PARAMS:
1027 if (cipher->set_params != NULL)
1029 cipher->set_params = OSSL_get_OP_cipher_set_params(fns);
1033 if ((fnciphcnt != 3 && fnciphcnt != 4)
1036 * In order to be a consistent set of functions we must have at least
1037 * a complete set of "encrypt" functions, or a complete set of "decrypt"
1038 * functions. In both cases we need a complete set of context management
1041 EVP_CIPHER_meth_free(cipher);
1042 EVPerr(EVP_F_EVP_CIPHER_FROM_DISPATCH, EVP_R_INVALID_PROVIDER_FUNCTIONS);
1045 cipher->prov = prov;
1047 ossl_provider_upref(prov);
1052 static int evp_cipher_upref(void *cipher)
1054 return EVP_CIPHER_upref(cipher);
1057 static void evp_cipher_free(void *cipher)
1059 EVP_CIPHER_meth_free(cipher);
1062 static int evp_cipher_nid(void *vcipher)
1064 EVP_CIPHER *cipher = vcipher;
1069 EVP_CIPHER *EVP_CIPHER_fetch(OPENSSL_CTX *ctx, const char *algorithm,
1070 const char *properties)
1072 return evp_generic_fetch(ctx, OSSL_OP_CIPHER, algorithm, properties,
1073 evp_cipher_from_dispatch, evp_cipher_upref,
1074 evp_cipher_free, evp_cipher_nid);