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0fde8acdad
[Makefile.in PROTOCOL PROTOCOL.chacha20poly1305 authfile.c chacha.c]
[chacha.h cipher-chachapoly.c cipher-chachapoly.h cipher.c cipher.h]
[dh.c myproposal.h packet.c poly1305.c poly1305.h servconf.c ssh.1]
[ssh.c ssh_config.5 sshd_config.5] Add a new protocol 2 transport
cipher "chacha20-poly1305@openssh.com" that combines Daniel
Bernstein's ChaCha20 stream cipher and Poly1305 MAC to build an
authenticated encryption mode.
Inspired by and similar to Adam Langley's proposal for TLS:
http://tools.ietf.org/html/draft-agl-tls-chacha20poly1305-03
but differs in layout used for the MAC calculation and the use of a
second ChaCha20 instance to separately encrypt packet lengths.
Details are in the PROTOCOL.chacha20poly1305 file.
Feedback markus@, naddy@; manpage bits Loganden Velvindron @ AfriNIC
ok markus@ naddy@
103 lines
4.0 KiB
C
103 lines
4.0 KiB
C
/* $OpenBSD: cipher.h,v 1.42 2013/11/21 00:45:44 djm Exp $ */
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/*
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* Author: Tatu Ylonen <ylo@cs.hut.fi>
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* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
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* All rights reserved
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*
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* As far as I am concerned, the code I have written for this software
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* can be used freely for any purpose. Any derived versions of this
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* software must be clearly marked as such, and if the derived work is
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* incompatible with the protocol description in the RFC file, it must be
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* called by a name other than "ssh" or "Secure Shell".
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*
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* Copyright (c) 2000 Markus Friedl. 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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* 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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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef CIPHER_H
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#define CIPHER_H
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#include <openssl/evp.h>
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#include "cipher-chachapoly.h"
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/*
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* Cipher types for SSH-1. New types can be added, but old types should not
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* be removed for compatibility. The maximum allowed value is 31.
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*/
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#define SSH_CIPHER_SSH2 -3
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#define SSH_CIPHER_INVALID -2 /* No valid cipher selected. */
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#define SSH_CIPHER_NOT_SET -1 /* None selected (invalid number). */
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#define SSH_CIPHER_NONE 0 /* no encryption */
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#define SSH_CIPHER_IDEA 1 /* IDEA CFB */
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#define SSH_CIPHER_DES 2 /* DES CBC */
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#define SSH_CIPHER_3DES 3 /* 3DES CBC */
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#define SSH_CIPHER_BROKEN_TSS 4 /* TRI's Simple Stream encryption CBC */
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#define SSH_CIPHER_BROKEN_RC4 5 /* Alleged RC4 */
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#define SSH_CIPHER_BLOWFISH 6
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#define SSH_CIPHER_RESERVED 7
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#define SSH_CIPHER_MAX 31
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#define CIPHER_ENCRYPT 1
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#define CIPHER_DECRYPT 0
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typedef struct Cipher Cipher;
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typedef struct CipherContext CipherContext;
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struct Cipher;
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struct CipherContext {
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int plaintext;
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int encrypt;
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EVP_CIPHER_CTX evp;
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struct chachapoly_ctx cp_ctx; /* XXX union with evp? */
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const Cipher *cipher;
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};
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u_int cipher_mask_ssh1(int);
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const Cipher *cipher_by_name(const char *);
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const Cipher *cipher_by_number(int);
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int cipher_number(const char *);
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char *cipher_name(int);
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int ciphers_valid(const char *);
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char *cipher_alg_list(char, int);
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void cipher_init(CipherContext *, const Cipher *, const u_char *, u_int,
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const u_char *, u_int, int);
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void cipher_crypt(CipherContext *, u_int, u_char *, const u_char *,
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u_int, u_int, u_int);
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int cipher_get_length(CipherContext *, u_int *, u_int,
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const u_char *, u_int);
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void cipher_cleanup(CipherContext *);
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void cipher_set_key_string(CipherContext *, const Cipher *, const char *, int);
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u_int cipher_blocksize(const Cipher *);
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u_int cipher_keylen(const Cipher *);
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u_int cipher_authlen(const Cipher *);
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u_int cipher_ivlen(const Cipher *);
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u_int cipher_is_cbc(const Cipher *);
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u_int cipher_get_number(const Cipher *);
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void cipher_get_keyiv(CipherContext *, u_char *, u_int);
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void cipher_set_keyiv(CipherContext *, u_char *);
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int cipher_get_keyiv_len(const CipherContext *);
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int cipher_get_keycontext(const CipherContext *, u_char *);
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void cipher_set_keycontext(CipherContext *, u_char *);
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#endif /* CIPHER_H */
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