2 * Copyright 1995-2020 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
10 /* We need to use some engine deprecated APIs */
11 #define OPENSSL_SUPPRESS_DEPRECATED
15 #include "internal/cryptlib.h"
16 #include <openssl/evp.h>
17 #include <openssl/err.h>
18 #include <openssl/rand.h>
19 #include <openssl/engine.h>
20 #include <openssl/params.h>
21 #include <openssl/core_names.h>
22 #include "crypto/evp.h"
23 #include "internal/provider.h"
24 #include "evp_local.h"
26 int EVP_CIPHER_CTX_reset(EVP_CIPHER_CTX *ctx)
31 if (ctx->cipher == NULL || ctx->cipher->prov == NULL)
34 if (ctx->provctx != NULL) {
35 if (ctx->cipher->freectx != NULL)
36 ctx->cipher->freectx(ctx->provctx);
39 if (ctx->fetched_cipher != NULL)
40 EVP_CIPHER_free(ctx->fetched_cipher);
41 memset(ctx, 0, sizeof(*ctx));
45 /* TODO(3.0): Remove legacy code below */
48 if (ctx->cipher != NULL) {
49 if (ctx->cipher->cleanup && !ctx->cipher->cleanup(ctx))
51 /* Cleanse cipher context data */
52 if (ctx->cipher_data && ctx->cipher->ctx_size)
53 OPENSSL_cleanse(ctx->cipher_data, ctx->cipher->ctx_size);
55 OPENSSL_free(ctx->cipher_data);
56 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
57 ENGINE_finish(ctx->engine);
59 memset(ctx, 0, sizeof(*ctx));
63 EVP_CIPHER_CTX *EVP_CIPHER_CTX_new(void)
65 return OPENSSL_zalloc(sizeof(EVP_CIPHER_CTX));
68 void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx)
70 EVP_CIPHER_CTX_reset(ctx);
74 int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
75 const unsigned char *key, const unsigned char *iv, int enc)
78 EVP_CIPHER_CTX_reset(ctx);
79 return EVP_CipherInit_ex(ctx, cipher, NULL, key, iv, enc);
82 int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
83 ENGINE *impl, const unsigned char *key,
84 const unsigned char *iv, int enc)
86 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
87 ENGINE *tmpimpl = NULL;
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_MODULE)
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_MODULE)
134 if (ctx->cipher == ctx->fetched_cipher)
136 EVP_CIPHER_free(ctx->fetched_cipher);
137 ctx->fetched_cipher = NULL;
141 * Ensure a context left lying around from last time is cleared
144 if (cipher != NULL && ctx->cipher != NULL) {
145 OPENSSL_clear_free(ctx->cipher_data, ctx->cipher->ctx_size);
146 ctx->cipher_data = NULL;
150 /* TODO(3.0): Start of non-legacy code below */
152 /* Ensure a context left lying around from last time is cleared */
153 if (cipher != NULL && ctx->cipher != NULL) {
154 unsigned long flags = ctx->flags;
156 EVP_CIPHER_CTX_reset(ctx);
157 /* Restore encrypt and flags */
163 cipher = ctx->cipher;
165 if (cipher->prov == NULL) {
167 /* We only do explicit fetches inside the FIPS module */
168 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
171 EVP_CIPHER *provciph =
172 EVP_CIPHER_fetch(NULL,
173 cipher->nid == NID_undef ? "NULL"
174 : OBJ_nid2sn(cipher->nid),
177 if (provciph == NULL)
180 EVP_CIPHER_free(ctx->fetched_cipher);
181 ctx->fetched_cipher = provciph;
185 ctx->cipher = cipher;
186 if (ctx->provctx == NULL) {
187 ctx->provctx = ctx->cipher->newctx(ossl_provider_ctx(cipher->prov));
188 if (ctx->provctx == NULL) {
189 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
194 if ((ctx->flags & EVP_CIPH_NO_PADDING) != 0) {
196 * If this ctx was already set up for no padding then we need to tell
197 * the new cipher about it.
199 if (!EVP_CIPHER_CTX_set_padding(ctx, 0))
204 if (ctx->cipher->einit == NULL) {
205 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
209 return ctx->cipher->einit(ctx->provctx,
212 : EVP_CIPHER_CTX_key_length(ctx),
215 : EVP_CIPHER_CTX_iv_length(ctx));
218 if (ctx->cipher->dinit == NULL) {
219 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
223 return ctx->cipher->dinit(ctx->provctx,
226 : EVP_CIPHER_CTX_key_length(ctx),
229 : EVP_CIPHER_CTX_iv_length(ctx));
231 /* TODO(3.0): Remove legacy code below */
234 if (cipher != NULL) {
236 * Ensure a context left lying around from last time is cleared (we
237 * previously attempted to avoid this if the same ENGINE and
238 * EVP_CIPHER could be used).
241 unsigned long flags = ctx->flags;
242 EVP_CIPHER_CTX_reset(ctx);
243 /* Restore encrypt and flags */
247 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
249 if (!ENGINE_init(impl)) {
250 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
257 /* There's an ENGINE for this job ... (apparently) */
258 const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid);
262 * One positive side-effect of US's export control history,
263 * is that we should at least be able to avoid using US
264 * misspellings of "initialisation"?
266 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
269 /* We'll use the ENGINE's private cipher definition */
272 * Store the ENGINE functional reference so we know 'cipher' came
273 * from an ENGINE and we need to release it when done.
281 ctx->cipher = cipher;
282 if (ctx->cipher->ctx_size) {
283 ctx->cipher_data = OPENSSL_zalloc(ctx->cipher->ctx_size);
284 if (ctx->cipher_data == NULL) {
286 EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE);
290 ctx->cipher_data = NULL;
292 ctx->key_len = cipher->key_len;
293 /* Preserve wrap enable flag, zero everything else */
294 ctx->flags &= EVP_CIPHER_CTX_FLAG_WRAP_ALLOW;
295 if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) {
296 if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) {
298 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
303 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
306 if (ctx->cipher == NULL)
309 /* we assume block size is a power of 2 in *cryptUpdate */
310 OPENSSL_assert(ctx->cipher->block_size == 1
311 || ctx->cipher->block_size == 8
312 || ctx->cipher->block_size == 16);
314 if (!(ctx->flags & EVP_CIPHER_CTX_FLAG_WRAP_ALLOW)
315 && EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_WRAP_MODE) {
316 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_WRAP_MODE_NOT_ALLOWED);
320 if (!(EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(ctx)) & EVP_CIPH_CUSTOM_IV)) {
321 switch (EVP_CIPHER_CTX_mode(ctx)) {
323 case EVP_CIPH_STREAM_CIPHER:
324 case EVP_CIPH_ECB_MODE:
327 case EVP_CIPH_CFB_MODE:
328 case EVP_CIPH_OFB_MODE:
333 case EVP_CIPH_CBC_MODE:
335 OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <=
336 (int)sizeof(ctx->iv));
338 memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
339 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
342 case EVP_CIPH_CTR_MODE:
344 /* Don't reuse IV for CTR mode */
346 memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx));
354 if (key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
355 if (!ctx->cipher->init(ctx, key, iv, enc))
360 ctx->block_mask = ctx->cipher->block_size - 1;
364 int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
365 const unsigned char *in, int inl)
368 return EVP_EncryptUpdate(ctx, out, outl, in, inl);
370 return EVP_DecryptUpdate(ctx, out, outl, in, inl);
373 int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
376 return EVP_EncryptFinal_ex(ctx, out, outl);
378 return EVP_DecryptFinal_ex(ctx, out, outl);
381 int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
384 return EVP_EncryptFinal(ctx, out, outl);
386 return EVP_DecryptFinal(ctx, out, outl);
389 int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
390 const unsigned char *key, const unsigned char *iv)
392 return EVP_CipherInit(ctx, cipher, key, iv, 1);
395 int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
396 ENGINE *impl, const unsigned char *key,
397 const unsigned char *iv)
399 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
402 int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
403 const unsigned char *key, const unsigned char *iv)
405 return EVP_CipherInit(ctx, cipher, key, iv, 0);
408 int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
409 ENGINE *impl, const unsigned char *key,
410 const unsigned char *iv)
412 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
416 * According to the letter of standard difference between pointers
417 * is specified to be valid only within same object. This makes
418 * it formally challenging to determine if input and output buffers
419 * are not partially overlapping with standard pointer arithmetic.
424 #if defined(OPENSSL_SYS_VMS) && __INITIAL_POINTER_SIZE==64
426 * Then we have VMS that distinguishes itself by adhering to
427 * sizeof(size_t)==4 even in 64-bit builds, which means that
428 * difference between two pointers might be truncated to 32 bits.
429 * In the context one can even wonder how comparison for
430 * equality is implemented. To be on the safe side we adhere to
431 * PTRDIFF_T even for comparison for equality.
433 # define PTRDIFF_T uint64_t
435 # define PTRDIFF_T size_t
438 int is_partially_overlapping(const void *ptr1, const void *ptr2, int len)
440 PTRDIFF_T diff = (PTRDIFF_T)ptr1-(PTRDIFF_T)ptr2;
442 * Check for partially overlapping buffers. [Binary logical
443 * operations are used instead of boolean to minimize number
444 * of conditional branches.]
446 int overlapped = (len > 0) & (diff != 0) & ((diff < (PTRDIFF_T)len) |
447 (diff > (0 - (PTRDIFF_T)len)));
452 static int evp_EncryptDecryptUpdate(EVP_CIPHER_CTX *ctx,
453 unsigned char *out, int *outl,
454 const unsigned char *in, int inl)
456 int i, j, bl, cmpl = inl;
458 if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
459 cmpl = (cmpl + 7) / 8;
461 bl = ctx->cipher->block_size;
463 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
464 /* If block size > 1 then the cipher will have to do this check */
465 if (bl == 1 && is_partially_overlapping(out, in, cmpl)) {
466 EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
470 i = ctx->cipher->do_cipher(ctx, out, in, inl);
482 if (is_partially_overlapping(out + ctx->buf_len, in, cmpl)) {
483 EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
487 if (ctx->buf_len == 0 && (inl & (ctx->block_mask)) == 0) {
488 if (ctx->cipher->do_cipher(ctx, out, in, inl)) {
497 OPENSSL_assert(bl <= (int)sizeof(ctx->buf));
500 memcpy(&(ctx->buf[i]), in, inl);
506 memcpy(&(ctx->buf[i]), in, j);
509 if (!ctx->cipher->do_cipher(ctx, out, ctx->buf, bl))
519 if (!ctx->cipher->do_cipher(ctx, out, in, inl))
525 memcpy(ctx->buf, &(in[inl]), i);
531 int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
532 const unsigned char *in, int inl)
538 /* Prevent accidental use of decryption context when encrypting */
540 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_INVALID_OPERATION);
544 if (ctx->cipher == NULL) {
545 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_NO_CIPHER_SET);
549 if (ctx->cipher->prov == NULL)
552 blocksize = EVP_CIPHER_CTX_block_size(ctx);
554 if (ctx->cipher->cupdate == NULL || blocksize < 1) {
555 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR);
558 ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl,
559 inl + (blocksize == 1 ? 0 : blocksize), in,
563 if (soutl > INT_MAX) {
564 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR);
572 /* TODO(3.0): Remove legacy code below */
575 return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl);
578 int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
581 ret = EVP_EncryptFinal_ex(ctx, out, outl);
585 int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
588 unsigned int i, b, bl;
592 /* Prevent accidental use of decryption context when encrypting */
594 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_INVALID_OPERATION);
598 if (ctx->cipher == NULL) {
599 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_NO_CIPHER_SET);
602 if (ctx->cipher->prov == NULL)
605 blocksize = EVP_CIPHER_CTX_block_size(ctx);
607 if (blocksize < 1 || ctx->cipher->cfinal == NULL) {
608 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR);
612 ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl,
613 blocksize == 1 ? 0 : blocksize);
616 if (soutl > INT_MAX) {
617 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR);
625 /* TODO(3.0): Remove legacy code below */
628 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
629 ret = ctx->cipher->do_cipher(ctx, out, NULL, 0);
637 b = ctx->cipher->block_size;
638 OPENSSL_assert(b <= sizeof(ctx->buf));
644 if (ctx->flags & EVP_CIPH_NO_PADDING) {
646 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,
647 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
655 for (i = bl; i < b; i++)
657 ret = ctx->cipher->do_cipher(ctx, out, ctx->buf, b);
665 int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
666 const unsigned char *in, int inl)
668 int fix_len, cmpl = inl, ret;
673 /* Prevent accidental use of encryption context when decrypting */
675 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_INVALID_OPERATION);
679 if (ctx->cipher == NULL) {
680 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_NO_CIPHER_SET);
683 if (ctx->cipher->prov == NULL)
686 blocksize = EVP_CIPHER_CTX_block_size(ctx);
688 if (ctx->cipher->cupdate == NULL || blocksize < 1) {
689 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR);
692 ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl,
693 inl + (blocksize == 1 ? 0 : blocksize), in,
697 if (soutl > INT_MAX) {
698 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR);
706 /* TODO(3.0): Remove legacy code below */
709 b = ctx->cipher->block_size;
711 if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
712 cmpl = (cmpl + 7) / 8;
714 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
715 if (b == 1 && is_partially_overlapping(out, in, cmpl)) {
716 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
720 fix_len = ctx->cipher->do_cipher(ctx, out, in, inl);
734 if (ctx->flags & EVP_CIPH_NO_PADDING)
735 return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl);
737 OPENSSL_assert(b <= sizeof(ctx->final));
739 if (ctx->final_used) {
740 /* see comment about PTRDIFF_T comparison above */
741 if (((PTRDIFF_T)out == (PTRDIFF_T)in)
742 || is_partially_overlapping(out, in, b)) {
743 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
746 memcpy(out, ctx->final, b);
752 if (!evp_EncryptDecryptUpdate(ctx, out, outl, in, inl))
756 * if we have 'decrypted' a multiple of block size, make sure we have a
757 * copy of this last block
759 if (b > 1 && !ctx->buf_len) {
762 memcpy(ctx->final, &out[*outl], b);
772 int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
775 ret = EVP_DecryptFinal_ex(ctx, out, outl);
779 int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
787 /* Prevent accidental use of encryption context when decrypting */
789 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_INVALID_OPERATION);
793 if (ctx->cipher == NULL) {
794 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_NO_CIPHER_SET);
798 if (ctx->cipher->prov == NULL)
801 blocksize = EVP_CIPHER_CTX_block_size(ctx);
803 if (blocksize < 1 || ctx->cipher->cfinal == NULL) {
804 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR);
808 ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl,
809 blocksize == 1 ? 0 : blocksize);
812 if (soutl > INT_MAX) {
813 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR);
821 /* TODO(3.0): Remove legacy code below */
825 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
826 i = ctx->cipher->do_cipher(ctx, out, NULL, 0);
834 b = ctx->cipher->block_size;
835 if (ctx->flags & EVP_CIPH_NO_PADDING) {
837 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,
838 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
845 if (ctx->buf_len || !ctx->final_used) {
846 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_WRONG_FINAL_BLOCK_LENGTH);
849 OPENSSL_assert(b <= sizeof(ctx->final));
852 * The following assumes that the ciphertext has been authenticated.
853 * Otherwise it provides a padding oracle.
855 n = ctx->final[b - 1];
856 if (n == 0 || n > (int)b) {
857 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
860 for (i = 0; i < n; i++) {
861 if (ctx->final[--b] != n) {
862 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
866 n = ctx->cipher->block_size - n;
867 for (i = 0; i < n; i++)
868 out[i] = ctx->final[i];
875 int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
877 if (c->cipher->prov != NULL) {
879 OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
882 if (EVP_CIPHER_CTX_key_length(c) == keylen)
885 /* Check the cipher actually understands this parameter */
886 if (OSSL_PARAM_locate_const(EVP_CIPHER_settable_ctx_params(c->cipher),
887 OSSL_CIPHER_PARAM_KEYLEN) == NULL)
890 params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_KEYLEN, &len);
891 ok = evp_do_ciph_ctx_setparams(c->cipher, c->provctx, params);
893 return ok > 0 ? 1 : 0;
896 /* TODO(3.0) legacy code follows */
899 * Note there have never been any built-in ciphers that define this flag
900 * since it was first introduced.
902 if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
903 return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
904 if (EVP_CIPHER_CTX_key_length(c) == keylen)
906 if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) {
910 EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH, EVP_R_INVALID_KEY_LENGTH);
914 int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
917 OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
918 unsigned int pd = pad;
921 ctx->flags &= ~EVP_CIPH_NO_PADDING;
923 ctx->flags |= EVP_CIPH_NO_PADDING;
925 params[0] = OSSL_PARAM_construct_uint(OSSL_CIPHER_PARAM_PADDING, &pd);
926 ok = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
931 int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
933 int ret = EVP_CTRL_RET_UNSUPPORTED;
937 OSSL_PARAM params[4] = {
938 OSSL_PARAM_END, OSSL_PARAM_END, OSSL_PARAM_END, OSSL_PARAM_END
941 if (ctx == NULL || ctx->cipher == NULL) {
942 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
946 if (ctx->cipher->prov == NULL)
950 case EVP_CTRL_SET_KEY_LENGTH:
951 params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_KEYLEN, &sz);
953 case EVP_CTRL_RAND_KEY: /* Used by DES */
956 OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_RANDOM_KEY,
962 * TODO(3.0) EVP_CTRL_INIT is purely legacy, no provider counterpart
963 * As a matter of fact, this should be dead code, but some caller
964 * might still do a direct control call with this command, so...
965 * Legacy methods return 1 except for exceptional circumstances, so
966 * we do the same here to not be disruptive.
969 case EVP_CTRL_SET_PIPELINE_OUTPUT_BUFS: /* Used by DASYNC */
972 case EVP_CTRL_AEAD_SET_IVLEN:
975 params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_IVLEN, &sz);
977 case EVP_CTRL_AEAD_SET_IV_FIXED:
978 params[0] = OSSL_PARAM_construct_octet_string(
979 OSSL_CIPHER_PARAM_AEAD_TLS1_IV_FIXED, ptr, sz);
981 case EVP_CTRL_GCM_IV_GEN:
984 sz = 0; /* special case that uses the iv length */
985 params[0] = OSSL_PARAM_construct_octet_string(
986 OSSL_CIPHER_PARAM_AEAD_TLS1_GET_IV_GEN, ptr, sz);
988 case EVP_CTRL_GCM_SET_IV_INV:
991 params[0] = OSSL_PARAM_construct_octet_string(
992 OSSL_CIPHER_PARAM_AEAD_TLS1_SET_IV_INV, ptr, sz);
994 case EVP_CTRL_GET_RC5_ROUNDS:
995 set_params = 0; /* Fall thru */
996 case EVP_CTRL_SET_RC5_ROUNDS:
999 i = (unsigned int)arg;
1000 params[0] = OSSL_PARAM_construct_uint(OSSL_CIPHER_PARAM_ROUNDS, &i);
1002 case EVP_CTRL_SET_SPEED:
1005 i = (unsigned int)arg;
1006 params[0] = OSSL_PARAM_construct_uint(OSSL_CIPHER_PARAM_SPEED, &i);
1008 case EVP_CTRL_AEAD_GET_TAG:
1009 set_params = 0; /* Fall thru */
1010 case EVP_CTRL_AEAD_SET_TAG:
1011 params[0] = OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TAG,
1014 case EVP_CTRL_AEAD_TLS1_AAD:
1015 /* This one does a set and a get - since it returns a size */
1017 OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TLS1_AAD,
1019 ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1023 OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_AEAD_TLS1_AAD_PAD, &sz);
1024 ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
1028 #ifndef OPENSSL_NO_RC2
1029 case EVP_CTRL_GET_RC2_KEY_BITS:
1030 set_params = 0; /* Fall thru */
1031 case EVP_CTRL_SET_RC2_KEY_BITS:
1032 params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_RC2_KEYBITS, &sz);
1034 #endif /* OPENSSL_NO_RC2 */
1035 #if !defined(OPENSSL_NO_MULTIBLOCK)
1036 case EVP_CTRL_TLS1_1_MULTIBLOCK_MAX_BUFSIZE:
1037 params[0] = OSSL_PARAM_construct_size_t(
1038 OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_MAX_SEND_FRAGMENT, &sz);
1039 ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1043 params[0] = OSSL_PARAM_construct_size_t(
1044 OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_MAX_BUFSIZE, &sz);
1045 params[1] = OSSL_PARAM_construct_end();
1046 ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
1050 case EVP_CTRL_TLS1_1_MULTIBLOCK_AAD: {
1051 EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM *p =
1052 (EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM *)ptr;
1054 if (arg < (int)sizeof(EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM))
1057 params[0] = OSSL_PARAM_construct_octet_string(
1058 OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_AAD, (void*)p->inp, p->len);
1059 params[1] = OSSL_PARAM_construct_uint(
1060 OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_INTERLEAVE, &p->interleave);
1061 ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1064 /* Retrieve the return values changed by the set */
1065 params[0] = OSSL_PARAM_construct_size_t(
1066 OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_AAD_PACKLEN, &sz);
1067 params[1] = OSSL_PARAM_construct_uint(
1068 OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_INTERLEAVE, &p->interleave);
1069 params[2] = OSSL_PARAM_construct_end();
1070 ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
1075 case EVP_CTRL_TLS1_1_MULTIBLOCK_ENCRYPT: {
1076 EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM *p =
1077 (EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM *)ptr;
1079 params[0] = OSSL_PARAM_construct_octet_string(
1080 OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_ENC, p->out, p->len);
1082 params[1] = OSSL_PARAM_construct_octet_string(
1083 OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_ENC_IN, (void*)p->inp,
1085 params[2] = OSSL_PARAM_construct_uint(
1086 OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_INTERLEAVE, &p->interleave);
1087 ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1090 params[0] = OSSL_PARAM_construct_size_t(
1091 OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_ENC_LEN, &sz);
1092 params[1] = OSSL_PARAM_construct_end();
1093 ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
1098 #endif /* OPENSSL_NO_MULTIBLOCK */
1099 case EVP_CTRL_AEAD_SET_MAC_KEY:
1102 params[0] = OSSL_PARAM_construct_octet_string(
1103 OSSL_CIPHER_PARAM_AEAD_MAC_KEY, ptr, sz);
1108 ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1110 ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
1113 /* TODO(3.0): Remove legacy code below */
1115 if (ctx->cipher->ctrl == NULL) {
1116 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
1120 ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
1123 if (ret == EVP_CTRL_RET_UNSUPPORTED) {
1124 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL,
1125 EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
1131 int EVP_CIPHER_get_params(EVP_CIPHER *cipher, OSSL_PARAM params[])
1133 if (cipher != NULL && cipher->get_params != NULL)
1134 return cipher->get_params(params);
1138 int EVP_CIPHER_CTX_set_params(EVP_CIPHER_CTX *ctx, const OSSL_PARAM params[])
1140 if (ctx->cipher != NULL && ctx->cipher->set_ctx_params != NULL)
1141 return ctx->cipher->set_ctx_params(ctx->provctx, params);
1145 int EVP_CIPHER_CTX_get_params(EVP_CIPHER_CTX *ctx, OSSL_PARAM params[])
1147 if (ctx->cipher != NULL && ctx->cipher->get_ctx_params != NULL)
1148 return ctx->cipher->get_ctx_params(ctx->provctx, params);
1152 const OSSL_PARAM *EVP_CIPHER_gettable_params(const EVP_CIPHER *cipher)
1154 if (cipher != NULL && cipher->gettable_params != NULL)
1155 return cipher->gettable_params(
1156 ossl_provider_ctx(EVP_CIPHER_provider(cipher)));
1160 const OSSL_PARAM *EVP_CIPHER_settable_ctx_params(const EVP_CIPHER *cipher)
1162 if (cipher != NULL && cipher->settable_ctx_params != NULL)
1163 return cipher->settable_ctx_params(
1164 ossl_provider_ctx(EVP_CIPHER_provider(cipher)));
1168 const OSSL_PARAM *EVP_CIPHER_gettable_ctx_params(const EVP_CIPHER *cipher)
1170 if (cipher != NULL && cipher->gettable_ctx_params != NULL)
1171 return cipher->gettable_ctx_params(
1172 ossl_provider_ctx(EVP_CIPHER_provider(cipher)));
1177 static OSSL_LIB_CTX *EVP_CIPHER_CTX_get_libctx(EVP_CIPHER_CTX *ctx)
1179 const EVP_CIPHER *cipher = ctx->cipher;
1180 const OSSL_PROVIDER *prov;
1185 prov = EVP_CIPHER_provider(cipher);
1186 return ossl_provider_library_context(prov);
1190 int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key)
1192 if (ctx->cipher->flags & EVP_CIPH_RAND_KEY)
1193 return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key);
1200 OSSL_LIB_CTX *libctx = EVP_CIPHER_CTX_get_libctx(ctx);
1202 kl = EVP_CIPHER_CTX_key_length(ctx);
1203 if (kl <= 0 || RAND_priv_bytes_ex(libctx, key, kl) <= 0)
1207 #endif /* FIPS_MODULE */
1210 int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in)
1212 if ((in == NULL) || (in->cipher == NULL)) {
1213 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INPUT_NOT_INITIALIZED);
1217 if (in->cipher->prov == NULL)
1220 if (in->cipher->dupctx == NULL) {
1221 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX);
1225 EVP_CIPHER_CTX_reset(out);
1228 out->provctx = NULL;
1230 if (in->fetched_cipher != NULL && !EVP_CIPHER_up_ref(in->fetched_cipher)) {
1231 out->fetched_cipher = NULL;
1235 out->provctx = in->cipher->dupctx(in->provctx);
1236 if (out->provctx == NULL) {
1237 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX);
1243 /* TODO(3.0): Remove legacy code below */
1246 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
1247 /* Make sure it's safe to copy a cipher context using an ENGINE */
1248 if (in->engine && !ENGINE_init(in->engine)) {
1249 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_ENGINE_LIB);
1254 EVP_CIPHER_CTX_reset(out);
1255 memcpy(out, in, sizeof(*out));
1257 if (in->cipher_data && in->cipher->ctx_size) {
1258 out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size);
1259 if (out->cipher_data == NULL) {
1261 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_MALLOC_FAILURE);
1264 memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size);
1267 if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY)
1268 if (!in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out)) {
1270 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INITIALIZATION_ERROR);
1276 EVP_CIPHER *evp_cipher_new(void)
1278 EVP_CIPHER *cipher = OPENSSL_zalloc(sizeof(EVP_CIPHER));
1280 if (cipher != NULL) {
1281 cipher->lock = CRYPTO_THREAD_lock_new();
1282 if (cipher->lock == NULL) {
1283 OPENSSL_free(cipher);
1292 * FIPS module note: since internal fetches will be entirely
1293 * provider based, we know that none of its code depends on legacy
1294 * NIDs or any functionality that use them.
1297 /* TODO(3.x) get rid of the need for legacy NIDs */
1298 static void set_legacy_nid(const char *name, void *vlegacy_nid)
1301 int *legacy_nid = vlegacy_nid;
1303 * We use lowest level function to get the associated method, because
1304 * higher level functions such as EVP_get_cipherbyname() have changed
1305 * to look at providers too.
1307 const void *legacy_method = OBJ_NAME_get(name, OBJ_NAME_TYPE_CIPHER_METH);
1309 if (*legacy_nid == -1) /* We found a clash already */
1311 if (legacy_method == NULL)
1313 nid = EVP_CIPHER_nid(legacy_method);
1314 if (*legacy_nid != NID_undef && *legacy_nid != nid) {
1322 static void *evp_cipher_from_dispatch(const int name_id,
1323 const OSSL_DISPATCH *fns,
1324 OSSL_PROVIDER *prov)
1326 EVP_CIPHER *cipher = NULL;
1327 int fnciphcnt = 0, fnctxcnt = 0;
1329 if ((cipher = evp_cipher_new()) == NULL) {
1330 EVPerr(0, ERR_R_MALLOC_FAILURE);
1335 /* TODO(3.x) get rid of the need for legacy NIDs */
1336 cipher->nid = NID_undef;
1337 evp_names_do_all(prov, name_id, set_legacy_nid, &cipher->nid);
1338 if (cipher->nid == -1) {
1339 ERR_raise(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR);
1340 EVP_CIPHER_free(cipher);
1345 cipher->name_id = name_id;
1347 for (; fns->function_id != 0; fns++) {
1348 switch (fns->function_id) {
1349 case OSSL_FUNC_CIPHER_NEWCTX:
1350 if (cipher->newctx != NULL)
1352 cipher->newctx = OSSL_FUNC_cipher_newctx(fns);
1355 case OSSL_FUNC_CIPHER_ENCRYPT_INIT:
1356 if (cipher->einit != NULL)
1358 cipher->einit = OSSL_FUNC_cipher_encrypt_init(fns);
1361 case OSSL_FUNC_CIPHER_DECRYPT_INIT:
1362 if (cipher->dinit != NULL)
1364 cipher->dinit = OSSL_FUNC_cipher_decrypt_init(fns);
1367 case OSSL_FUNC_CIPHER_UPDATE:
1368 if (cipher->cupdate != NULL)
1370 cipher->cupdate = OSSL_FUNC_cipher_update(fns);
1373 case OSSL_FUNC_CIPHER_FINAL:
1374 if (cipher->cfinal != NULL)
1376 cipher->cfinal = OSSL_FUNC_cipher_final(fns);
1379 case OSSL_FUNC_CIPHER_CIPHER:
1380 if (cipher->ccipher != NULL)
1382 cipher->ccipher = OSSL_FUNC_cipher_cipher(fns);
1384 case OSSL_FUNC_CIPHER_FREECTX:
1385 if (cipher->freectx != NULL)
1387 cipher->freectx = OSSL_FUNC_cipher_freectx(fns);
1390 case OSSL_FUNC_CIPHER_DUPCTX:
1391 if (cipher->dupctx != NULL)
1393 cipher->dupctx = OSSL_FUNC_cipher_dupctx(fns);
1395 case OSSL_FUNC_CIPHER_GET_PARAMS:
1396 if (cipher->get_params != NULL)
1398 cipher->get_params = OSSL_FUNC_cipher_get_params(fns);
1400 case OSSL_FUNC_CIPHER_GET_CTX_PARAMS:
1401 if (cipher->get_ctx_params != NULL)
1403 cipher->get_ctx_params = OSSL_FUNC_cipher_get_ctx_params(fns);
1405 case OSSL_FUNC_CIPHER_SET_CTX_PARAMS:
1406 if (cipher->set_ctx_params != NULL)
1408 cipher->set_ctx_params = OSSL_FUNC_cipher_set_ctx_params(fns);
1410 case OSSL_FUNC_CIPHER_GETTABLE_PARAMS:
1411 if (cipher->gettable_params != NULL)
1413 cipher->gettable_params = OSSL_FUNC_cipher_gettable_params(fns);
1415 case OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS:
1416 if (cipher->gettable_ctx_params != NULL)
1418 cipher->gettable_ctx_params =
1419 OSSL_FUNC_cipher_gettable_ctx_params(fns);
1421 case OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS:
1422 if (cipher->settable_ctx_params != NULL)
1424 cipher->settable_ctx_params =
1425 OSSL_FUNC_cipher_settable_ctx_params(fns);
1429 if ((fnciphcnt != 0 && fnciphcnt != 3 && fnciphcnt != 4)
1430 || (fnciphcnt == 0 && cipher->ccipher == NULL)
1433 * In order to be a consistent set of functions we must have at least
1434 * a complete set of "encrypt" functions, or a complete set of "decrypt"
1435 * functions, or a single "cipher" function. In all cases we need both
1436 * the "newctx" and "freectx" functions.
1438 EVP_CIPHER_free(cipher);
1439 EVPerr(EVP_F_EVP_CIPHER_FROM_DISPATCH, EVP_R_INVALID_PROVIDER_FUNCTIONS);
1442 cipher->prov = prov;
1444 ossl_provider_up_ref(prov);
1449 static int evp_cipher_up_ref(void *cipher)
1451 return EVP_CIPHER_up_ref(cipher);
1454 static void evp_cipher_free(void *cipher)
1456 EVP_CIPHER_free(cipher);
1459 EVP_CIPHER *EVP_CIPHER_fetch(OSSL_LIB_CTX *ctx, const char *algorithm,
1460 const char *properties)
1462 EVP_CIPHER *cipher =
1463 evp_generic_fetch(ctx, OSSL_OP_CIPHER, algorithm, properties,
1464 evp_cipher_from_dispatch, evp_cipher_up_ref,
1467 if (cipher != NULL && !evp_cipher_cache_constants(cipher)) {
1468 EVP_CIPHER_free(cipher);
1474 int EVP_CIPHER_up_ref(EVP_CIPHER *cipher)
1478 CRYPTO_UP_REF(&cipher->refcnt, &ref, cipher->lock);
1482 void EVP_CIPHER_free(EVP_CIPHER *cipher)
1489 CRYPTO_DOWN_REF(&cipher->refcnt, &i, cipher->lock);
1492 ossl_provider_free(cipher->prov);
1493 CRYPTO_THREAD_lock_free(cipher->lock);
1494 OPENSSL_free(cipher);
1497 void EVP_CIPHER_do_all_provided(OSSL_LIB_CTX *libctx,
1498 void (*fn)(EVP_CIPHER *mac, void *arg),
1501 evp_generic_do_all(libctx, OSSL_OP_CIPHER,
1502 (void (*)(void *, void *))fn, arg,
1503 evp_cipher_from_dispatch, evp_cipher_free);