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add encrypt-then-mac (EtM) modes to openssh by defining new mac algorithms
that change the packet format and compute the MAC over the encrypted
message (including the packet size) instead of the plaintext data;
these EtM modes are considered more secure and used by default.
feedback and ok djm@

/* $OpenBSD: myproposal.h,v 1.31 2012/12/11 22:31:18 markus Exp $ */

/*
 * Copyright (c) 2000 Markus Friedl.  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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
 */

#define KEX_DEFAULT_KEX		\
	"ecdh-sha2-nistp256," \
	"ecdh-sha2-nistp384," \
	"ecdh-sha2-nistp521," \
	"diffie-hellman-group-exchange-sha256," \
	"diffie-hellman-group-exchange-sha1," \
	"diffie-hellman-group14-sha1," \
	"diffie-hellman-group1-sha1"

#define	KEX_DEFAULT_PK_ALG	\
	"ecdsa-sha2-nistp256-cert-v01@openssh.com," \
	"ecdsa-sha2-nistp384-cert-v01@openssh.com," \
	"ecdsa-sha2-nistp521-cert-v01@openssh.com," \
	"ssh-rsa-cert-v01@openssh.com," \
	"ssh-dss-cert-v01@openssh.com," \
	"ssh-rsa-cert-v00@openssh.com," \
	"ssh-dss-cert-v00@openssh.com," \
	"ecdsa-sha2-nistp256," \
	"ecdsa-sha2-nistp384," \
	"ecdsa-sha2-nistp521," \
	"ssh-rsa," \
	"ssh-dss"

#define	KEX_DEFAULT_ENCRYPT \
	"aes128-ctr,aes192-ctr,aes256-ctr," \
	"arcfour256,arcfour128," \
	"aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc," \
	"aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se"
#define	KEX_DEFAULT_MAC \
	"hmac-md5-etm@openssh.com," \
	"hmac-sha1-etm@openssh.com," \
	"umac-64-etm@openssh.com," \
	"umac-128-etm@openssh.com," \
	"hmac-sha2-256-etm@openssh.com," \
	"hmac-sha2-512-etm@openssh.com," \
	"hmac-ripemd160-etm@openssh.com," \
	"hmac-sha1-96-etm@openssh.com," \
	"hmac-md5-96-etm@openssh.com," \
	"hmac-md5," \
	"hmac-sha1," \
	"umac-64@openssh.com," \
	"umac-128@openssh.com," \
	"hmac-sha2-256," \
	"hmac-sha2-512," \
	"hmac-ripemd160," \
	"hmac-ripemd160@openssh.com," \
	"hmac-sha1-96," \
	"hmac-md5-96"

#define	KEX_DEFAULT_COMP	"none,zlib@openssh.com,zlib"
#define	KEX_DEFAULT_LANG	""


static char *myproposal[PROPOSAL_MAX] = {
	KEX_DEFAULT_KEX,
	KEX_DEFAULT_PK_ALG,
	KEX_DEFAULT_ENCRYPT,
	KEX_DEFAULT_ENCRYPT,
	KEX_DEFAULT_MAC,
	KEX_DEFAULT_MAC,
	KEX_DEFAULT_COMP,
	KEX_DEFAULT_COMP,
	KEX_DEFAULT_LANG,
	KEX_DEFAULT_LANG
};