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:
160 case NID_aes_256_ctr:
161 case NID_aes_192_ctr:
162 case NID_aes_128_ctr:
170 * Ensure a context left lying around from last time is cleared
173 if (cipher != NULL && ctx->cipher != NULL) {
174 OPENSSL_clear_free(ctx->cipher_data, ctx->cipher->ctx_size);
175 ctx->cipher_data = NULL;
179 /* TODO(3.0): Start of non-legacy code below */
181 /* Ensure a context left lying around from last time is cleared */
182 if (cipher != NULL && ctx->cipher != NULL) {
183 unsigned long flags = ctx->flags;
185 EVP_CIPHER_CTX_reset(ctx);
186 /* Restore encrypt and flags */
192 ctx->cipher = cipher;
194 cipher = ctx->cipher;
196 if (cipher->prov == NULL) {
197 provciph = EVP_CIPHER_fetch(NULL, OBJ_nid2sn(cipher->nid), "");
198 if (provciph == NULL) {
199 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
203 EVP_CIPHER_meth_free(ctx->fetched_cipher);
204 ctx->fetched_cipher = provciph;
207 ctx->cipher = cipher;
208 if (ctx->provctx == NULL) {
209 ctx->provctx = ctx->cipher->newctx();
210 if (ctx->provctx == NULL) {
211 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
216 if ((ctx->flags & EVP_CIPH_NO_PADDING) != 0) {
218 * If this ctx was already set up for no padding then we need to tell
219 * the new cipher about it.
221 if (!EVP_CIPHER_CTX_set_padding(ctx, 0))
225 switch (EVP_CIPHER_mode(ctx->cipher)) {
226 case EVP_CIPH_CFB_MODE:
227 case EVP_CIPH_OFB_MODE:
228 case EVP_CIPH_CBC_MODE:
229 /* For these modes we remember the original IV for later use */
230 if (!ossl_assert(EVP_CIPHER_CTX_iv_length(ctx) <= (int)sizeof(ctx->oiv))) {
231 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
235 memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
239 if (ctx->cipher->einit == NULL) {
240 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
244 return ctx->cipher->einit(ctx->provctx, key, iv);
247 if (ctx->cipher->dinit == NULL) {
248 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
252 return ctx->cipher->dinit(ctx->provctx, key, iv);
254 /* TODO(3.0): Remove legacy code below */
257 if (cipher != NULL) {
259 * Ensure a context left lying around from last time is cleared (we
260 * previously attempted to avoid this if the same ENGINE and
261 * EVP_CIPHER could be used).
264 unsigned long flags = ctx->flags;
265 EVP_CIPHER_CTX_reset(ctx);
266 /* Restore encrypt and flags */
270 #ifndef OPENSSL_NO_ENGINE
272 if (!ENGINE_init(impl)) {
273 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
280 /* There's an ENGINE for this job ... (apparently) */
281 const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid);
285 * One positive side-effect of US's export control history,
286 * is that we should at least be able to avoid using US
287 * misspellings of "initialisation"?
289 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
292 /* We'll use the ENGINE's private cipher definition */
295 * Store the ENGINE functional reference so we know 'cipher' came
296 * from an ENGINE and we need to release it when done.
304 ctx->cipher = cipher;
305 if (ctx->cipher->ctx_size) {
306 ctx->cipher_data = OPENSSL_zalloc(ctx->cipher->ctx_size);
307 if (ctx->cipher_data == NULL) {
309 EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE);
313 ctx->cipher_data = NULL;
315 ctx->key_len = cipher->key_len;
316 /* Preserve wrap enable flag, zero everything else */
317 ctx->flags &= EVP_CIPHER_CTX_FLAG_WRAP_ALLOW;
318 if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) {
319 if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) {
321 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
326 #ifndef OPENSSL_NO_ENGINE
329 /* we assume block size is a power of 2 in *cryptUpdate */
330 OPENSSL_assert(ctx->cipher->block_size == 1
331 || ctx->cipher->block_size == 8
332 || ctx->cipher->block_size == 16);
334 if (!(ctx->flags & EVP_CIPHER_CTX_FLAG_WRAP_ALLOW)
335 && EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_WRAP_MODE) {
336 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_WRAP_MODE_NOT_ALLOWED);
340 if (!(EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(ctx)) & EVP_CIPH_CUSTOM_IV)) {
341 switch (EVP_CIPHER_CTX_mode(ctx)) {
343 case EVP_CIPH_STREAM_CIPHER:
344 case EVP_CIPH_ECB_MODE:
347 case EVP_CIPH_CFB_MODE:
348 case EVP_CIPH_OFB_MODE:
353 case EVP_CIPH_CBC_MODE:
355 OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <=
356 (int)sizeof(ctx->iv));
358 memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
359 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
362 case EVP_CIPH_CTR_MODE:
364 /* Don't reuse IV for CTR mode */
366 memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx));
374 if (key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
375 if (!ctx->cipher->init(ctx, key, iv, enc))
380 ctx->block_mask = ctx->cipher->block_size - 1;
384 int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
385 const unsigned char *in, int inl)
388 return EVP_EncryptUpdate(ctx, out, outl, in, inl);
390 return EVP_DecryptUpdate(ctx, out, outl, in, inl);
393 int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
396 return EVP_EncryptFinal_ex(ctx, out, outl);
398 return EVP_DecryptFinal_ex(ctx, out, outl);
401 int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
404 return EVP_EncryptFinal(ctx, out, outl);
406 return EVP_DecryptFinal(ctx, out, outl);
409 int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
410 const unsigned char *key, const unsigned char *iv)
412 return EVP_CipherInit(ctx, cipher, key, iv, 1);
415 int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
416 ENGINE *impl, const unsigned char *key,
417 const unsigned char *iv)
419 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
422 int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
423 const unsigned char *key, const unsigned char *iv)
425 return EVP_CipherInit(ctx, cipher, key, iv, 0);
428 int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
429 ENGINE *impl, const unsigned char *key,
430 const unsigned char *iv)
432 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
436 * According to the letter of standard difference between pointers
437 * is specified to be valid only within same object. This makes
438 * it formally challenging to determine if input and output buffers
439 * are not partially overlapping with standard pointer arithmetic.
444 #if defined(OPENSSL_SYS_VMS) && __INITIAL_POINTER_SIZE==64
446 * Then we have VMS that distinguishes itself by adhering to
447 * sizeof(size_t)==4 even in 64-bit builds, which means that
448 * difference between two pointers might be truncated to 32 bits.
449 * In the context one can even wonder how comparison for
450 * equality is implemented. To be on the safe side we adhere to
451 * PTRDIFF_T even for comparison for equality.
453 # define PTRDIFF_T uint64_t
455 # define PTRDIFF_T size_t
458 int is_partially_overlapping(const void *ptr1, const void *ptr2, int len)
460 PTRDIFF_T diff = (PTRDIFF_T)ptr1-(PTRDIFF_T)ptr2;
462 * Check for partially overlapping buffers. [Binary logical
463 * operations are used instead of boolean to minimize number
464 * of conditional branches.]
466 int overlapped = (len > 0) & (diff != 0) & ((diff < (PTRDIFF_T)len) |
467 (diff > (0 - (PTRDIFF_T)len)));
472 static int evp_EncryptDecryptUpdate(EVP_CIPHER_CTX *ctx,
473 unsigned char *out, int *outl,
474 const unsigned char *in, int inl)
476 int i, j, bl, cmpl = inl;
478 if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
479 cmpl = (cmpl + 7) / 8;
481 bl = ctx->cipher->block_size;
488 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
489 /* If block size > 1 then the cipher will have to do this check */
490 if (bl == 1 && is_partially_overlapping(out, in, cmpl)) {
491 EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
495 i = ctx->cipher->do_cipher(ctx, out, in, inl);
503 if (is_partially_overlapping(out + ctx->buf_len, in, cmpl)) {
504 EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
508 if (ctx->buf_len == 0 && (inl & (ctx->block_mask)) == 0) {
509 if (ctx->cipher->do_cipher(ctx, out, in, inl)) {
518 OPENSSL_assert(bl <= (int)sizeof(ctx->buf));
521 memcpy(&(ctx->buf[i]), in, inl);
527 memcpy(&(ctx->buf[i]), in, j);
530 if (!ctx->cipher->do_cipher(ctx, out, ctx->buf, bl))
540 if (!ctx->cipher->do_cipher(ctx, out, in, inl))
546 memcpy(ctx->buf, &(in[inl]), i);
552 int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
553 const unsigned char *in, int inl)
558 /* Prevent accidental use of decryption context when encrypting */
560 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_INVALID_OPERATION);
564 if (ctx->cipher == NULL || ctx->cipher->prov == NULL)
567 if (ctx->cipher->cupdate == NULL) {
568 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR);
571 ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl, in, (size_t)inl);
573 if (soutl > INT_MAX) {
574 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR);
580 /* TODO(3.0): Remove legacy code below */
583 return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl);
586 int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
589 ret = EVP_EncryptFinal_ex(ctx, out, outl);
593 int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
596 unsigned int i, b, bl;
599 /* Prevent accidental use of decryption context when encrypting */
601 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_INVALID_OPERATION);
605 if (ctx->cipher == NULL || ctx->cipher->prov == NULL)
608 if (ctx->cipher->cfinal == NULL) {
609 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR);
613 ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl);
615 if (soutl > INT_MAX) {
616 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR);
623 /* TODO(3.0): Remove legacy code below */
626 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
627 ret = ctx->cipher->do_cipher(ctx, out, NULL, 0);
635 b = ctx->cipher->block_size;
636 OPENSSL_assert(b <= sizeof(ctx->buf));
642 if (ctx->flags & EVP_CIPH_NO_PADDING) {
644 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,
645 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
653 for (i = bl; i < b; i++)
655 ret = ctx->cipher->do_cipher(ctx, out, ctx->buf, b);
663 int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
664 const unsigned char *in, int inl)
666 int fix_len, cmpl = inl, ret;
670 /* Prevent accidental use of encryption context when decrypting */
672 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_INVALID_OPERATION);
676 if (ctx->cipher == NULL || ctx->cipher->prov == NULL)
679 if (ctx->cipher->cupdate == NULL) {
680 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR);
683 ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl, in, (size_t)inl);
686 if (soutl > INT_MAX) {
687 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR);
695 /* TODO(3.0): Remove legacy code below */
698 b = ctx->cipher->block_size;
700 if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
701 cmpl = (cmpl + 7) / 8;
708 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
709 if (b == 1 && is_partially_overlapping(out, in, cmpl)) {
710 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
714 fix_len = ctx->cipher->do_cipher(ctx, out, in, inl);
723 if (ctx->flags & EVP_CIPH_NO_PADDING)
724 return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl);
726 OPENSSL_assert(b <= sizeof(ctx->final));
728 if (ctx->final_used) {
729 /* see comment about PTRDIFF_T comparison above */
730 if (((PTRDIFF_T)out == (PTRDIFF_T)in)
731 || is_partially_overlapping(out, in, b)) {
732 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
735 memcpy(out, ctx->final, b);
741 if (!evp_EncryptDecryptUpdate(ctx, out, outl, in, inl))
745 * if we have 'decrypted' a multiple of block size, make sure we have a
746 * copy of this last block
748 if (b > 1 && !ctx->buf_len) {
751 memcpy(ctx->final, &out[*outl], b);
761 int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
764 ret = EVP_DecryptFinal_ex(ctx, out, outl);
768 int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
775 /* Prevent accidental use of encryption context when decrypting */
777 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_INVALID_OPERATION);
781 if (ctx->cipher == NULL || ctx->cipher->prov == NULL)
784 if (ctx->cipher->cfinal == NULL) {
785 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR);
789 ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl);
792 if (soutl > INT_MAX) {
793 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR);
801 /* TODO(3.0): Remove legacy code below */
806 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
807 i = ctx->cipher->do_cipher(ctx, out, NULL, 0);
815 b = ctx->cipher->block_size;
816 if (ctx->flags & EVP_CIPH_NO_PADDING) {
818 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,
819 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
826 if (ctx->buf_len || !ctx->final_used) {
827 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_WRONG_FINAL_BLOCK_LENGTH);
830 OPENSSL_assert(b <= sizeof(ctx->final));
833 * The following assumes that the ciphertext has been authenticated.
834 * Otherwise it provides a padding oracle.
836 n = ctx->final[b - 1];
837 if (n == 0 || n > (int)b) {
838 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
841 for (i = 0; i < n; i++) {
842 if (ctx->final[--b] != n) {
843 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
847 n = ctx->cipher->block_size - n;
848 for (i = 0; i < n; i++)
849 out[i] = ctx->final[i];
856 int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
858 if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
859 return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
860 if (EVP_CIPHER_CTX_key_length(c) == keylen)
862 if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) {
866 EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH, EVP_R_INVALID_KEY_LENGTH);
870 int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
873 ctx->flags &= ~EVP_CIPH_NO_PADDING;
875 ctx->flags |= EVP_CIPH_NO_PADDING;
877 if (ctx->cipher != NULL && ctx->cipher->prov != NULL) {
878 OSSL_PARAM params[] = {
879 OSSL_PARAM_int(OSSL_CIPHER_PARAM_PADDING, NULL),
883 params[0].data = &pad;
885 if (ctx->cipher->ctx_set_params == NULL) {
886 EVPerr(EVP_F_EVP_CIPHER_CTX_SET_PADDING, EVP_R_CTRL_NOT_IMPLEMENTED);
890 if (!ctx->cipher->ctx_set_params(ctx->provctx, params))
897 int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
902 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
906 if (!ctx->cipher->ctrl) {
907 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
911 ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
913 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL,
914 EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
920 int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key)
922 if (ctx->cipher->flags & EVP_CIPH_RAND_KEY)
923 return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key);
924 if (RAND_priv_bytes(key, ctx->key_len) <= 0)
929 int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in)
931 if ((in == NULL) || (in->cipher == NULL)) {
932 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INPUT_NOT_INITIALIZED);
936 if (in->cipher->prov == NULL)
939 if (in->cipher->dupctx == NULL) {
940 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX);
944 EVP_CIPHER_CTX_reset(out);
949 if (in->fetched_cipher != NULL && !EVP_CIPHER_upref(in->fetched_cipher)) {
950 out->fetched_cipher = NULL;
954 out->provctx = in->cipher->dupctx(in->provctx);
955 if (out->provctx == NULL) {
956 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX);
962 /* TODO(3.0): Remove legacy code below */
965 #ifndef OPENSSL_NO_ENGINE
966 /* Make sure it's safe to copy a cipher context using an ENGINE */
967 if (in->engine && !ENGINE_init(in->engine)) {
968 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_ENGINE_LIB);
973 EVP_CIPHER_CTX_reset(out);
974 memcpy(out, in, sizeof(*out));
976 if (in->cipher_data && in->cipher->ctx_size) {
977 out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size);
978 if (out->cipher_data == NULL) {
980 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_MALLOC_FAILURE);
983 memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size);
986 if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY)
987 if (!in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out)) {
989 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INITIALIZATION_ERROR);
995 static void *evp_cipher_from_dispatch(int nid, const OSSL_DISPATCH *fns,
998 EVP_CIPHER *cipher = NULL;
999 int fnciphcnt = 0, fnctxcnt = 0;
1001 if ((cipher = EVP_CIPHER_meth_new(nid, 0, 0)) == NULL)
1004 for (; fns->function_id != 0; fns++) {
1005 switch (fns->function_id) {
1006 case OSSL_FUNC_CIPHER_NEWCTX:
1007 if (cipher->newctx != NULL)
1009 cipher->newctx = OSSL_get_OP_cipher_newctx(fns);
1012 case OSSL_FUNC_CIPHER_ENCRYPT_INIT:
1013 if (cipher->einit != NULL)
1015 cipher->einit = OSSL_get_OP_cipher_encrypt_init(fns);
1018 case OSSL_FUNC_CIPHER_DECRYPT_INIT:
1019 if (cipher->dinit != NULL)
1021 cipher->dinit = OSSL_get_OP_cipher_decrypt_init(fns);
1024 case OSSL_FUNC_CIPHER_UPDATE:
1025 if (cipher->cupdate != NULL)
1027 cipher->cupdate = OSSL_get_OP_cipher_update(fns);
1030 case OSSL_FUNC_CIPHER_FINAL:
1031 if (cipher->cfinal != NULL)
1033 cipher->cfinal = OSSL_get_OP_cipher_final(fns);
1036 case OSSL_FUNC_CIPHER_CIPHER:
1037 if (cipher->ccipher != NULL)
1039 cipher->ccipher = OSSL_get_OP_cipher_cipher(fns);
1041 case OSSL_FUNC_CIPHER_FREECTX:
1042 if (cipher->freectx != NULL)
1044 cipher->freectx = OSSL_get_OP_cipher_freectx(fns);
1047 case OSSL_FUNC_CIPHER_DUPCTX:
1048 if (cipher->dupctx != NULL)
1050 cipher->dupctx = OSSL_get_OP_cipher_dupctx(fns);
1052 case OSSL_FUNC_CIPHER_KEY_LENGTH:
1053 if (cipher->key_length != NULL)
1055 cipher->key_length = OSSL_get_OP_cipher_key_length(fns);
1057 case OSSL_FUNC_CIPHER_IV_LENGTH:
1058 if (cipher->iv_length != NULL)
1060 cipher->iv_length = OSSL_get_OP_cipher_iv_length(fns);
1062 case OSSL_FUNC_CIPHER_BLOCK_SIZE:
1063 if (cipher->blocksize != NULL)
1065 cipher->blocksize = OSSL_get_OP_cipher_block_size(fns);
1067 case OSSL_FUNC_CIPHER_GET_PARAMS:
1068 if (cipher->get_params != NULL)
1070 cipher->get_params = OSSL_get_OP_cipher_get_params(fns);
1072 case OSSL_FUNC_CIPHER_CTX_GET_PARAMS:
1073 if (cipher->ctx_get_params != NULL)
1075 cipher->ctx_get_params = OSSL_get_OP_cipher_ctx_get_params(fns);
1077 case OSSL_FUNC_CIPHER_CTX_SET_PARAMS:
1078 if (cipher->ctx_set_params != NULL)
1080 cipher->ctx_set_params = OSSL_get_OP_cipher_ctx_set_params(fns);
1084 if ((fnciphcnt != 0 && fnciphcnt != 3 && fnciphcnt != 4)
1085 || (fnciphcnt == 0 && cipher->ccipher == NULL)
1088 * In order to be a consistent set of functions we must have at least
1089 * a complete set of "encrypt" functions, or a complete set of "decrypt"
1090 * functions, or a single "cipher" function. In all cases we need a
1091 * complete set of context management functions
1093 EVP_CIPHER_meth_free(cipher);
1094 EVPerr(EVP_F_EVP_CIPHER_FROM_DISPATCH, EVP_R_INVALID_PROVIDER_FUNCTIONS);
1097 cipher->prov = prov;
1099 ossl_provider_upref(prov);
1104 static int evp_cipher_upref(void *cipher)
1106 return EVP_CIPHER_upref(cipher);
1109 static void evp_cipher_free(void *cipher)
1111 EVP_CIPHER_meth_free(cipher);
1114 static int evp_cipher_nid(void *vcipher)
1116 EVP_CIPHER *cipher = vcipher;
1121 EVP_CIPHER *EVP_CIPHER_fetch(OPENSSL_CTX *ctx, const char *algorithm,
1122 const char *properties)
1124 return evp_generic_fetch(ctx, OSSL_OP_CIPHER, algorithm, properties,
1125 evp_cipher_from_dispatch, evp_cipher_upref,
1126 evp_cipher_free, evp_cipher_nid);