GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libssl/d1_enc.c Lines: 42 44 95.5 %
Date: 2017-11-13 Branches: 27 32 84.4 %

Line Branch Exec Source
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/* $OpenBSD: d1_enc.c,v 1.14 2017/01/23 08:08:06 beck Exp $ */
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/*
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 * DTLS implementation written by Nagendra Modadugu
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 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
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 */
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/* ====================================================================
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 * Copyright (c) 1998-2005 The OpenSSL Project.  All rights reserved.
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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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 *
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 *
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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
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 *    the documentation and/or other materials provided with the
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 *    distribution.
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 *
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 * 3. All advertising materials mentioning features or use of this
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 *    software must display the following acknowledgment:
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 *    "This product includes software developed by the OpenSSL Project
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 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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 *
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 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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 *    endorse or promote products derived from this software without
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 *    prior written permission. For written permission, please contact
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 *    openssl-core@openssl.org.
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 *
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 * 5. Products derived from this software may not be called "OpenSSL"
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 *    nor may "OpenSSL" appear in their names without prior written
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 *    permission of the OpenSSL Project.
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 *
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 * 6. Redistributions of any form whatsoever must retain the following
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 *    acknowledgment:
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 *    "This product includes software developed by the OpenSSL Project
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 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
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 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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 * OF THE POSSIBILITY OF SUCH DAMAGE.
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 * ====================================================================
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 *
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 * This product includes cryptographic software written by Eric Young
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 * (eay@cryptsoft.com).  This product includes software written by Tim
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 * Hudson (tjh@cryptsoft.com).
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 *
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 */
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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 "ssl_locl.h"
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#include <openssl/evp.h>
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#include <openssl/hmac.h>
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#include <openssl/md5.h>
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/* dtls1_enc encrypts/decrypts the record in |s->wrec| / |s->rrec|, respectively.
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 *
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 * Returns:
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 *   0: (in non-constant time) if the record is publically invalid (i.e. too
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 *       short etc).
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 *   1: if the record's padding is valid / the encryption was successful.
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 *   -1: if the record's padding/AEAD-authenticator is invalid or, if sending,
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 *       an internal error occured. */
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int
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dtls1_enc(SSL *s, int send)
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{
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	SSL3_RECORD *rec;
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	EVP_CIPHER_CTX *ds;
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	unsigned long l;
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	int bs, i, j, k, mac_size = 0;
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	const EVP_CIPHER *enc;
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	if (send) {
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		if (EVP_MD_CTX_md(s->internal->write_hash)) {
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			mac_size = EVP_MD_CTX_size(s->internal->write_hash);
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			if (mac_size < 0)
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				return -1;
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		}
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		ds = s->internal->enc_write_ctx;
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		rec = &(S3I(s)->wrec);
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		if (s->internal->enc_write_ctx == NULL)
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			enc = NULL;
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		else {
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			enc = EVP_CIPHER_CTX_cipher(s->internal->enc_write_ctx);
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			if (rec->data != rec->input) {
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#ifdef DEBUG
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				/* we can't write into the input stream */
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				fprintf(stderr, "%s:%d: rec->data != rec->input\n",
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				    __FILE__, __LINE__);
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#endif
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			} else if (EVP_CIPHER_block_size(ds->cipher) > 1) {
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				arc4random_buf(rec->input,
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				    EVP_CIPHER_block_size(ds->cipher));
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			}
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		}
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	} else {
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		if (EVP_MD_CTX_md(s->read_hash)) {
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			mac_size = EVP_MD_CTX_size(s->read_hash);
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			OPENSSL_assert(mac_size >= 0);
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		}
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		ds = s->enc_read_ctx;
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		rec = &(S3I(s)->rrec);
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		if (s->enc_read_ctx == NULL)
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			enc = NULL;
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		else
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			enc = EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
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	}
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	if ((s->session == NULL) || (ds == NULL) || (enc == NULL)) {
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		memmove(rec->data, rec->input, rec->length);
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		rec->input = rec->data;
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	} else {
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		l = rec->length;
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		bs = EVP_CIPHER_block_size(ds->cipher);
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		if ((bs != 1) && send) {
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			i = bs - ((int)l % bs);
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			/* Add weird padding of upto 256 bytes */
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			/* we need to add 'i' padding bytes of value j */
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			j = i - 1;
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			for (k = (int)l; k < (int)(l + i); k++)
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				rec->input[k] = j;
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			l += i;
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			rec->length += i;
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		}
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		if (!send) {
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			if (l == 0 || l % bs != 0)
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				return 0;
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		}
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		EVP_Cipher(ds, rec->data, rec->input, l);
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		if ((bs != 1) && !send)
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			return tls1_cbc_remove_padding(s, rec, bs, mac_size);
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	}
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	return (1);
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}
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