Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libssl/d1_enc.c	Lines:	42	44	95.5 %
Date:	2017-11-07	Branches:	27	32	84.4 %


/* $OpenBSD: d1_enc.c,v 1.14 2017/01/23 08:08:06 beck Exp $ */
/*
 * DTLS implementation written by Nagendra Modadugu
 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
 */
/* ====================================================================
 * Copyright (c) 1998-2005 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    openssl-core@openssl.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 *
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 *
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 *
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <stdio.h>

#include "ssl_locl.h"

#include <openssl/evp.h>
#include <openssl/hmac.h>
#include <openssl/md5.h>

/* dtls1_enc encrypts/decrypts the record in |s->wrec| / |s->rrec|, respectively.
 *
 * Returns:
 *   0: (in non-constant time) if the record is publically invalid (i.e. too
 *       short etc).
 *   1: if the record's padding is valid / the encryption was successful.
 *   -1: if the record's padding/AEAD-authenticator is invalid or, if sending,
 *       an internal error occured. */
int
dtls1_enc(SSL *s, int send)
{
	SSL3_RECORD *rec;
	EVP_CIPHER_CTX *ds;
	unsigned long l;
	int bs, i, j, k, mac_size = 0;
	const EVP_CIPHER *enc;

	if (send) {
		if (EVP_MD_CTX_md(s->internal->write_hash)) {
			mac_size = EVP_MD_CTX_size(s->internal->write_hash);
			if (mac_size < 0)
				return -1;
		}
		ds = s->internal->enc_write_ctx;
		rec = &(S3I(s)->wrec);
		if (s->internal->enc_write_ctx == NULL)
			enc = NULL;
		else {
			enc = EVP_CIPHER_CTX_cipher(s->internal->enc_write_ctx);
			if (rec->data != rec->input) {
#ifdef DEBUG
				/* we can't write into the input stream */
				fprintf(stderr, "%s:%d: rec->data != rec->input\n",
				    __FILE__, __LINE__);
#endif
			} else if (EVP_CIPHER_block_size(ds->cipher) > 1) {
				arc4random_buf(rec->input,
				    EVP_CIPHER_block_size(ds->cipher));
			}
		}
	} else {
		if (EVP_MD_CTX_md(s->read_hash)) {
			mac_size = EVP_MD_CTX_size(s->read_hash);
			OPENSSL_assert(mac_size >= 0);
		}
		ds = s->enc_read_ctx;
		rec = &(S3I(s)->rrec);
		if (s->enc_read_ctx == NULL)
			enc = NULL;
		else
			enc = EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
	}


	if ((s->session == NULL) || (ds == NULL) || (enc == NULL)) {
		memmove(rec->data, rec->input, rec->length);
		rec->input = rec->data;
	} else {
		l = rec->length;
		bs = EVP_CIPHER_block_size(ds->cipher);

		if ((bs != 1) && send) {
			i = bs - ((int)l % bs);

			/* Add weird padding of upto 256 bytes */

			/* we need to add 'i' padding bytes of value j */
			j = i - 1;
			for (k = (int)l; k < (int)(l + i); k++)
				rec->input[k] = j;
			l += i;
			rec->length += i;
		}


		if (!send) {
			if (l == 0 || l % bs != 0)
				return 0;
		}

		EVP_Cipher(ds, rec->data, rec->input, l);


		if ((bs != 1) && !send)
			return tls1_cbc_remove_padding(s, rec, bs, mac_size);
	}
	return (1);
}



Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: d1_enc.c,v 1.14 2017/01/23 08:08:06 beck Exp $ */
2			/*
3			* DTLS implementation written by Nagendra Modadugu
4			* (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
5			*/
6			/* ====================================================================
7			* Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved.
8			*
9			* Redistribution and use in source and binary forms, with or without
10			* modification, are permitted provided that the following conditions
11			* are met:
12			*
13			* 1. Redistributions of source code must retain the above copyright
14			* notice, this list of conditions and the following disclaimer.
15			*
16			* 2. Redistributions in binary form must reproduce the above copyright
17			* notice, this list of conditions and the following disclaimer in
18			* the documentation and/or other materials provided with the
19			* distribution.
20			*
21			* 3. All advertising materials mentioning features or use of this
22			* software must display the following acknowledgment:
23			* "This product includes software developed by the OpenSSL Project
24			* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
25			*
26			* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27			* endorse or promote products derived from this software without
28			* prior written permission. For written permission, please contact
29			* openssl-core@openssl.org.
30			*
31			* 5. Products derived from this software may not be called "OpenSSL"
32			* nor may "OpenSSL" appear in their names without prior written
33			* permission of the OpenSSL Project.
34			*
35			* 6. Redistributions of any form whatsoever must retain the following
36			* acknowledgment:
37			* "This product includes software developed by the OpenSSL Project
38			* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
39			*
40			* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41			* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43			* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44			* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45			* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46			* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47			* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49			* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50			* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51			* OF THE POSSIBILITY OF SUCH DAMAGE.
52			* ====================================================================
53			*
54			* This product includes cryptographic software written by Eric Young
55			* (eay@cryptsoft.com). This product includes software written by Tim
56			* Hudson (tjh@cryptsoft.com).
57			*
58			*/
59			/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
60			* All rights reserved.
61			*
62			* This package is an SSL implementation written
63			* by Eric Young (eay@cryptsoft.com).
64			* The implementation was written so as to conform with Netscapes SSL.
65			*
66			* This library is free for commercial and non-commercial use as long as
67			* the following conditions are aheared to. The following conditions
68			* apply to all code found in this distribution, be it the RC4, RSA,
69			* lhash, DES, etc., code; not just the SSL code. The SSL documentation
70			* included with this distribution is covered by the same copyright terms
71			* except that the holder is Tim Hudson (tjh@cryptsoft.com).
72			*
73			* Copyright remains Eric Young's, and as such any Copyright notices in
74			* the code are not to be removed.
75			* If this package is used in a product, Eric Young should be given attribution
76			* as the author of the parts of the library used.
77			* This can be in the form of a textual message at program startup or
78			* in documentation (online or textual) provided with the package.
79			*
80			* Redistribution and use in source and binary forms, with or without
81			* modification, are permitted provided that the following conditions
82			* are met:
83			* 1. Redistributions of source code must retain the copyright
84			* notice, this list of conditions and the following disclaimer.
85			* 2. Redistributions in binary form must reproduce the above copyright
86			* notice, this list of conditions and the following disclaimer in the
87			* documentation and/or other materials provided with the distribution.
88			* 3. All advertising materials mentioning features or use of this software
89			* must display the following acknowledgement:
90			* "This product includes cryptographic software written by
91			* Eric Young (eay@cryptsoft.com)"
92			* The word 'cryptographic' can be left out if the rouines from the library
93			* being used are not cryptographic related :-).
94			* 4. If you include any Windows specific code (or a derivative thereof) from
95			* the apps directory (application code) you must include an acknowledgement:
96			* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
97			*
98			* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
99			* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
100			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
101			* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
102			* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
103			* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
104			* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
105			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
106			* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
107			* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
108			* SUCH DAMAGE.
109			*
110			* The licence and distribution terms for any publically available version or
111			* derivative of this code cannot be changed. i.e. this code cannot simply be
112			* copied and put under another distribution licence
113			* [including the GNU Public Licence.]
114			*/
115
116			#include <stdio.h>
117
118			#include "ssl_locl.h"
119
120			#include <openssl/evp.h>
121			#include <openssl/hmac.h>
122			#include <openssl/md5.h>
123
124			/* dtls1_enc encrypts/decrypts the record in \|s->wrec\| / \|s->rrec\|, respectively.
125			*
126			* Returns:
127			* 0: (in non-constant time) if the record is publically invalid (i.e. too
128			* short etc).
129			* 1: if the record's padding is valid / the encryption was successful.
130			* -1: if the record's padding/AEAD-authenticator is invalid or, if sending,
131			* an internal error occured. */
132			int
133			dtls1_enc(SSL *s, int send)
134			{
135			SSL3_RECORD *rec;
136			EVP_CIPHER_CTX *ds;
137			unsigned long l;
138			int bs, i, j, k, mac_size = 0;
139			const EVP_CIPHER *enc;
140
141	✓✓	2840	if (send) {
142	✓✓	760	if (EVP_MD_CTX_md(s->internal->write_hash)) {
143		288	mac_size = EVP_MD_CTX_size(s->internal->write_hash);
144	✗✓	288	if (mac_size < 0)
145			return -1;
146			}
147		760	ds = s->internal->enc_write_ctx;
148		760	rec = &(S3I(s)->wrec);
149	✓✓	760	if (s->internal->enc_write_ctx == NULL)
150		472	enc = NULL;
151			else {
152		288	enc = EVP_CIPHER_CTX_cipher(s->internal->enc_write_ctx);
153	✓✗	288	if (rec->data != rec->input) {
154			#ifdef DEBUG
155			/* we can't write into the input stream */
156			fprintf(stderr, "%s:%d: rec->data != rec->input\n",
157			__FILE__, __LINE__);
158			#endif
159	✓✓	288	} else if (EVP_CIPHER_block_size(ds->cipher) > 1) {
160		480	arc4random_buf(rec->input,
161		240	EVP_CIPHER_block_size(ds->cipher));
162		240	}
163			}
164			} else {
165	✓✓	660	if (EVP_MD_CTX_md(s->read_hash)) {
166		192	mac_size = EVP_MD_CTX_size(s->read_hash);
167	✗✓	192	OPENSSL_assert(mac_size >= 0);
168			}
169		660	ds = s->enc_read_ctx;
170		660	rec = &(S3I(s)->rrec);
171	✓✓	660	if (s->enc_read_ctx == NULL)
172		468	enc = NULL;
173			else
174		192	enc = EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
175			}
176
177
178	✓✓	1420	if ((s->session == NULL) \|\| (ds == NULL) \|\| (enc == NULL)) {
179		940	memmove(rec->data, rec->input, rec->length);
180		940	rec->input = rec->data;
181		940	} else {
182		480	l = rec->length;
183		480	bs = EVP_CIPHER_block_size(ds->cipher);
184
185	✓✓	480	if ((bs != 1) && send) {
186		240	i = bs - ((int)l % bs);
187
188			/* Add weird padding of upto 256 bytes */
189
190			/* we need to add 'i' padding bytes of value j */
191		240	j = i - 1;
192	✓✓	4128	for (k = (int)l; k < (int)(l + i); k++)
193		1824	rec->input[k] = j;
194			l += i;
195		240	rec->length += i;
196		240	}
197
198
199	✓✓	480	if (!send) {
200	✓✗✗✓	384	if (l == 0 \|\| l % bs != 0)
201			return 0;
202			}
203
204		480	EVP_Cipher(ds, rec->data, rec->input, l);
205
206
207	✓✓	480	if ((bs != 1) && !send)
208		160	return tls1_cbc_remove_padding(s, rec, bs, mac_size);
209			}
210		1260	return (1);
211		1420	}
212