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696 lines
16 KiB
C
696 lines
16 KiB
C
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/* $OpenBSD: evp_enc.c,v 1.43 2019/04/14 17:16:57 jsing Exp $ */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <openssl/opensslconf.h>
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#include <openssl/err.h>
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#include <openssl/evp.h>
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#ifndef OPENSSL_NO_ENGINE
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#include <openssl/engine.h>
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#endif
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#include "evp_locl.h"
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#define M_do_cipher(ctx, out, in, inl) ctx->cipher->do_cipher(ctx, out, in, inl)
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int
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EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
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const unsigned char *key, const unsigned char *iv, int enc)
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{
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if (cipher)
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EVP_CIPHER_CTX_init(ctx);
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return EVP_CipherInit_ex(ctx, cipher, NULL, key, iv, enc);
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}
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int
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EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl,
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const unsigned char *key, const unsigned char *iv, int enc)
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{
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if (enc == -1)
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enc = ctx->encrypt;
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else {
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if (enc)
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enc = 1;
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ctx->encrypt = enc;
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}
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#ifndef OPENSSL_NO_ENGINE
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/* Whether it's nice or not, "Inits" can be used on "Final"'d contexts
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* so this context may already have an ENGINE! Try to avoid releasing
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* the previous handle, re-querying for an ENGINE, and having a
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* reinitialisation, when it may all be unecessary. */
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if (ctx->engine && ctx->cipher &&
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(!cipher || (cipher && (cipher->nid == ctx->cipher->nid))))
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goto skip_to_init;
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#endif
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if (cipher) {
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/* Ensure a context left lying around from last time is cleared
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* (the previous check attempted to avoid this if the same
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* ENGINE and EVP_CIPHER could be used). */
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if (ctx->cipher) {
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unsigned long flags = ctx->flags;
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EVP_CIPHER_CTX_cleanup(ctx);
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/* Restore encrypt and flags */
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ctx->encrypt = enc;
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ctx->flags = flags;
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}
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#ifndef OPENSSL_NO_ENGINE
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if (impl) {
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if (!ENGINE_init(impl)) {
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EVPerror(EVP_R_INITIALIZATION_ERROR);
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return 0;
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}
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} else
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/* Ask if an ENGINE is reserved for this job */
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impl = ENGINE_get_cipher_engine(cipher->nid);
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if (impl) {
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/* There's an ENGINE for this job ... (apparently) */
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const EVP_CIPHER *c =
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ENGINE_get_cipher(impl, cipher->nid);
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if (!c) {
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EVPerror(EVP_R_INITIALIZATION_ERROR);
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return 0;
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}
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/* We'll use the ENGINE's private cipher definition */
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cipher = c;
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/* Store the ENGINE functional reference so we know
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* 'cipher' came from an ENGINE and we need to release
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* it when done. */
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ctx->engine = impl;
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} else
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ctx->engine = NULL;
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#endif
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ctx->cipher = cipher;
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if (ctx->cipher->ctx_size) {
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ctx->cipher_data = calloc(1, ctx->cipher->ctx_size);
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if (ctx->cipher_data == NULL) {
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EVPerror(ERR_R_MALLOC_FAILURE);
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return 0;
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}
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} else {
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ctx->cipher_data = NULL;
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}
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ctx->key_len = cipher->key_len;
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ctx->flags &= EVP_CIPHER_CTX_FLAG_WRAP_ALLOW;
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if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) {
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if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) {
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EVPerror(EVP_R_INITIALIZATION_ERROR);
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return 0;
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}
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}
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} else if (!ctx->cipher) {
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EVPerror(EVP_R_NO_CIPHER_SET);
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return 0;
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}
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#ifndef OPENSSL_NO_ENGINE
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skip_to_init:
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#endif
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/* we assume block size is a power of 2 in *cryptUpdate */
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if (ctx->cipher->block_size != 1 &&
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ctx->cipher->block_size != 8 &&
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ctx->cipher->block_size != 16) {
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EVPerror(EVP_R_BAD_BLOCK_LENGTH);
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return 0;
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}
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if (!(ctx->flags & EVP_CIPHER_CTX_FLAG_WRAP_ALLOW) &&
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EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_WRAP_MODE) {
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EVPerror(EVP_R_WRAP_MODE_NOT_ALLOWED);
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return 0;
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}
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if (!(EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_CUSTOM_IV)) {
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switch (EVP_CIPHER_CTX_mode(ctx)) {
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case EVP_CIPH_STREAM_CIPHER:
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case EVP_CIPH_ECB_MODE:
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break;
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case EVP_CIPH_CFB_MODE:
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case EVP_CIPH_OFB_MODE:
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ctx->num = 0;
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/* fall-through */
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case EVP_CIPH_CBC_MODE:
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if ((size_t)EVP_CIPHER_CTX_iv_length(ctx) >
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sizeof(ctx->iv)) {
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EVPerror(EVP_R_IV_TOO_LARGE);
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return 0;
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}
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if (iv)
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memcpy(ctx->oiv, iv,
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EVP_CIPHER_CTX_iv_length(ctx));
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memcpy(ctx->iv, ctx->oiv,
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EVP_CIPHER_CTX_iv_length(ctx));
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break;
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case EVP_CIPH_CTR_MODE:
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ctx->num = 0;
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/* Don't reuse IV for CTR mode */
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if (iv)
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memcpy(ctx->iv, iv,
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EVP_CIPHER_CTX_iv_length(ctx));
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break;
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default:
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return 0;
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break;
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}
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}
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if (key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
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if (!ctx->cipher->init(ctx, key, iv, enc))
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return 0;
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}
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ctx->buf_len = 0;
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ctx->final_used = 0;
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ctx->block_mask = ctx->cipher->block_size - 1;
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return 1;
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}
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int
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EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
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const unsigned char *in, int inl)
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{
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if (ctx->encrypt)
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return EVP_EncryptUpdate(ctx, out, outl, in, inl);
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else
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return EVP_DecryptUpdate(ctx, out, outl, in, inl);
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}
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int
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EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
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{
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if (ctx->encrypt)
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return EVP_EncryptFinal_ex(ctx, out, outl);
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else
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return EVP_DecryptFinal_ex(ctx, out, outl);
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}
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__warn_references(EVP_CipherFinal,
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"EVP_CipherFinal is often misused, please use EVP_CipherFinal_ex and EVP_CIPHER_CTX_cleanup");
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int
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EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
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{
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int ret;
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if (ctx->encrypt)
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ret = EVP_EncryptFinal_ex(ctx, out, outl);
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else
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ret = EVP_DecryptFinal_ex(ctx, out, outl);
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return ret;
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}
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int
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EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
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const unsigned char *key, const unsigned char *iv)
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{
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return EVP_CipherInit(ctx, cipher, key, iv, 1);
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}
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int
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EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl,
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const unsigned char *key, const unsigned char *iv)
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{
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return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
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}
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int
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EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
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const unsigned char *key, const unsigned char *iv)
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{
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return EVP_CipherInit(ctx, cipher, key, iv, 0);
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}
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int
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EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl,
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const unsigned char *key, const unsigned char *iv)
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{
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return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
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}
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int
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EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
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const unsigned char *in, int inl)
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{
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int i, j, bl;
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if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
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i = M_do_cipher(ctx, out, in, inl);
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if (i < 0)
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return 0;
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else
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*outl = i;
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return 1;
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}
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if (inl <= 0) {
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*outl = 0;
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return inl == 0;
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}
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if (ctx->buf_len == 0 && (inl&(ctx->block_mask)) == 0) {
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if (M_do_cipher(ctx, out, in, inl)) {
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*outl = inl;
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return 1;
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} else {
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*outl = 0;
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return 0;
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}
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}
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i = ctx->buf_len;
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bl = ctx->cipher->block_size;
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if ((size_t)bl > sizeof(ctx->buf)) {
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EVPerror(EVP_R_BAD_BLOCK_LENGTH);
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*outl = 0;
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return 0;
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}
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if (i != 0) {
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if (bl - i > inl) {
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memcpy(&(ctx->buf[i]), in, inl);
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ctx->buf_len += inl;
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*outl = 0;
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return 1;
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} else {
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j = bl - i;
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memcpy(&(ctx->buf[i]), in, j);
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if (!M_do_cipher(ctx, out, ctx->buf, bl))
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return 0;
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inl -= j;
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in += j;
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out += bl;
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*outl = bl;
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}
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} else
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*outl = 0;
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i = inl&(bl - 1);
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inl -= i;
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if (inl > 0) {
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if (!M_do_cipher(ctx, out, in, inl))
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return 0;
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*outl += inl;
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}
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if (i != 0)
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memcpy(ctx->buf, &(in[inl]), i);
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ctx->buf_len = i;
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return 1;
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}
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__warn_references(EVP_EncryptFinal,
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"EVP_EncryptFinal is often misused, please use EVP_EncryptFinal_ex and EVP_CIPHER_CTX_cleanup");
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int
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EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
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{
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int ret;
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ret = EVP_EncryptFinal_ex(ctx, out, outl);
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return ret;
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}
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int
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EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
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{
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int n, ret;
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unsigned int i, b, bl;
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if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
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ret = M_do_cipher(ctx, out, NULL, 0);
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if (ret < 0)
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return 0;
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else
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*outl = ret;
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return 1;
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}
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b = ctx->cipher->block_size;
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if (b > sizeof ctx->buf) {
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EVPerror(EVP_R_BAD_BLOCK_LENGTH);
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return 0;
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}
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if (b == 1) {
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*outl = 0;
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return 1;
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}
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bl = ctx->buf_len;
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if (ctx->flags & EVP_CIPH_NO_PADDING) {
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if (bl) {
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EVPerror(EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
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return 0;
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}
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*outl = 0;
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return 1;
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}
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n = b - bl;
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for (i = bl; i < b; i++)
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ctx->buf[i] = n;
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ret = M_do_cipher(ctx, out, ctx->buf, b);
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if (ret)
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*outl = b;
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return ret;
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}
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int
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||
|
EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
|
||
|
const unsigned char *in, int inl)
|
||
|
{
|
||
|
int fix_len;
|
||
|
unsigned int b;
|
||
|
|
||
|
if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
|
||
|
fix_len = M_do_cipher(ctx, out, in, inl);
|
||
|
if (fix_len < 0) {
|
||
|
*outl = 0;
|
||
|
return 0;
|
||
|
} else
|
||
|
*outl = fix_len;
|
||
|
return 1;
|
||
|
}
|
||
|
|
||
|
if (inl <= 0) {
|
||
|
*outl = 0;
|
||
|
return inl == 0;
|
||
|
}
|
||
|
|
||
|
if (ctx->flags & EVP_CIPH_NO_PADDING)
|
||
|
return EVP_EncryptUpdate(ctx, out, outl, in, inl);
|
||
|
|
||
|
b = ctx->cipher->block_size;
|
||
|
if (b > sizeof ctx->final) {
|
||
|
EVPerror(EVP_R_BAD_BLOCK_LENGTH);
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
if (ctx->final_used) {
|
||
|
memcpy(out, ctx->final, b);
|
||
|
out += b;
|
||
|
fix_len = 1;
|
||
|
} else
|
||
|
fix_len = 0;
|
||
|
|
||
|
|
||
|
if (!EVP_EncryptUpdate(ctx, out, outl, in, inl))
|
||
|
return 0;
|
||
|
|
||
|
/* if we have 'decrypted' a multiple of block size, make sure
|
||
|
* we have a copy of this last block */
|
||
|
if (b > 1 && !ctx->buf_len) {
|
||
|
*outl -= b;
|
||
|
ctx->final_used = 1;
|
||
|
memcpy(ctx->final, &out[*outl], b);
|
||
|
} else
|
||
|
ctx->final_used = 0;
|
||
|
|
||
|
if (fix_len)
|
||
|
*outl += b;
|
||
|
|
||
|
return 1;
|
||
|
}
|
||
|
|
||
|
__warn_references(EVP_DecryptFinal,
|
||
|
"EVP_DecryptFinal is often misused, please use EVP_DecryptFinal_ex and EVP_CIPHER_CTX_cleanup");
|
||
|
|
||
|
int
|
||
|
EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
|
||
|
{
|
||
|
int ret;
|
||
|
|
||
|
ret = EVP_DecryptFinal_ex(ctx, out, outl);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
int
|
||
|
EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
|
||
|
{
|
||
|
int i, n;
|
||
|
unsigned int b;
|
||
|
*outl = 0;
|
||
|
|
||
|
if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
|
||
|
i = M_do_cipher(ctx, out, NULL, 0);
|
||
|
if (i < 0)
|
||
|
return 0;
|
||
|
else
|
||
|
*outl = i;
|
||
|
return 1;
|
||
|
}
|
||
|
|
||
|
b = ctx->cipher->block_size;
|
||
|
if (ctx->flags & EVP_CIPH_NO_PADDING) {
|
||
|
if (ctx->buf_len) {
|
||
|
EVPerror(EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
|
||
|
return 0;
|
||
|
}
|
||
|
*outl = 0;
|
||
|
return 1;
|
||
|
}
|
||
|
if (b > 1) {
|
||
|
if (ctx->buf_len || !ctx->final_used) {
|
||
|
EVPerror(EVP_R_WRONG_FINAL_BLOCK_LENGTH);
|
||
|
return (0);
|
||
|
}
|
||
|
if (b > sizeof ctx->final) {
|
||
|
EVPerror(EVP_R_BAD_BLOCK_LENGTH);
|
||
|
return 0;
|
||
|
}
|
||
|
n = ctx->final[b - 1];
|
||
|
if (n == 0 || n > (int)b) {
|
||
|
EVPerror(EVP_R_BAD_DECRYPT);
|
||
|
return (0);
|
||
|
}
|
||
|
for (i = 0; i < n; i++) {
|
||
|
if (ctx->final[--b] != n) {
|
||
|
EVPerror(EVP_R_BAD_DECRYPT);
|
||
|
return (0);
|
||
|
}
|
||
|
}
|
||
|
n = ctx->cipher->block_size - n;
|
||
|
for (i = 0; i < n; i++)
|
||
|
out[i] = ctx->final[i];
|
||
|
*outl = n;
|
||
|
} else
|
||
|
*outl = 0;
|
||
|
return (1);
|
||
|
}
|
||
|
|
||
|
EVP_CIPHER_CTX *
|
||
|
EVP_CIPHER_CTX_new(void)
|
||
|
{
|
||
|
return calloc(1, sizeof(EVP_CIPHER_CTX));
|
||
|
}
|
||
|
|
||
|
void
|
||
|
EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx)
|
||
|
{
|
||
|
if (ctx == NULL)
|
||
|
return;
|
||
|
|
||
|
EVP_CIPHER_CTX_cleanup(ctx);
|
||
|
|
||
|
free(ctx);
|
||
|
}
|
||
|
|
||
|
void
|
||
|
EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx)
|
||
|
{
|
||
|
memset(ctx, 0, sizeof(EVP_CIPHER_CTX));
|
||
|
}
|
||
|
|
||
|
int
|
||
|
EVP_CIPHER_CTX_reset(EVP_CIPHER_CTX *a)
|
||
|
{
|
||
|
return EVP_CIPHER_CTX_cleanup(a);
|
||
|
}
|
||
|
|
||
|
int
|
||
|
EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c)
|
||
|
{
|
||
|
if (c->cipher != NULL) {
|
||
|
if (c->cipher->cleanup && !c->cipher->cleanup(c))
|
||
|
return 0;
|
||
|
/* Cleanse cipher context data */
|
||
|
if (c->cipher_data)
|
||
|
explicit_bzero(c->cipher_data, c->cipher->ctx_size);
|
||
|
}
|
||
|
/* XXX - store size of cipher_data so we can always freezero(). */
|
||
|
free(c->cipher_data);
|
||
|
#ifndef OPENSSL_NO_ENGINE
|
||
|
ENGINE_finish(c->engine);
|
||
|
#endif
|
||
|
explicit_bzero(c, sizeof(EVP_CIPHER_CTX));
|
||
|
return 1;
|
||
|
}
|
||
|
|
||
|
int
|
||
|
EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
|
||
|
{
|
||
|
if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
|
||
|
return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH,
|
||
|
keylen, NULL);
|
||
|
if (c->key_len == keylen)
|
||
|
return 1;
|
||
|
if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) {
|
||
|
c->key_len = keylen;
|
||
|
return 1;
|
||
|
}
|
||
|
EVPerror(EVP_R_INVALID_KEY_LENGTH);
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
int
|
||
|
EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
|
||
|
{
|
||
|
if (pad)
|
||
|
ctx->flags &= ~EVP_CIPH_NO_PADDING;
|
||
|
else
|
||
|
ctx->flags |= EVP_CIPH_NO_PADDING;
|
||
|
return 1;
|
||
|
}
|
||
|
|
||
|
int
|
||
|
EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
|
||
|
{
|
||
|
int ret;
|
||
|
|
||
|
if (!ctx->cipher) {
|
||
|
EVPerror(EVP_R_NO_CIPHER_SET);
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
if (!ctx->cipher->ctrl) {
|
||
|
EVPerror(EVP_R_CTRL_NOT_IMPLEMENTED);
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
|
||
|
if (ret == -1) {
|
||
|
EVPerror(EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
|
||
|
return 0;
|
||
|
}
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
int
|
||
|
EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key)
|
||
|
{
|
||
|
if (ctx->cipher->flags & EVP_CIPH_RAND_KEY)
|
||
|
return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key);
|
||
|
arc4random_buf(key, ctx->key_len);
|
||
|
return 1;
|
||
|
}
|
||
|
|
||
|
int
|
||
|
EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in)
|
||
|
{
|
||
|
if ((in == NULL) || (in->cipher == NULL)) {
|
||
|
EVPerror(EVP_R_INPUT_NOT_INITIALIZED);
|
||
|
return 0;
|
||
|
}
|
||
|
#ifndef OPENSSL_NO_ENGINE
|
||
|
/* Make sure it's safe to copy a cipher context using an ENGINE */
|
||
|
if (in->engine && !ENGINE_init(in->engine)) {
|
||
|
EVPerror(ERR_R_ENGINE_LIB);
|
||
|
return 0;
|
||
|
}
|
||
|
#endif
|
||
|
|
||
|
EVP_CIPHER_CTX_cleanup(out);
|
||
|
memcpy(out, in, sizeof *out);
|
||
|
|
||
|
if (in->cipher_data && in->cipher->ctx_size) {
|
||
|
out->cipher_data = calloc(1, in->cipher->ctx_size);
|
||
|
if (out->cipher_data == NULL) {
|
||
|
EVPerror(ERR_R_MALLOC_FAILURE);
|
||
|
return 0;
|
||
|
}
|
||
|
memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size);
|
||
|
}
|
||
|
|
||
|
if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY) {
|
||
|
if (!in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY,
|
||
|
0, out)) {
|
||
|
/*
|
||
|
* If the custom copy control failed, assume that there
|
||
|
* may still be pointers copied in the cipher_data that
|
||
|
* we do not own. This may result in a leak from a bad
|
||
|
* custom copy control, but that's preferable to a
|
||
|
* double free...
|
||
|
*/
|
||
|
freezero(out->cipher_data, in->cipher->ctx_size);
|
||
|
out->cipher_data = NULL;
|
||
|
return 0;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return 1;
|
||
|
}
|