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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@
42 lines
1.6 KiB
C
42 lines
1.6 KiB
C
/* $OpenBSD: cipher-chachapoly.h,v 1.1 2013/11/21 00:45:44 djm Exp $ */
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/*
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* Copyright (c) Damien Miller 2013 <djm@mindrot.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef CHACHA_POLY_AEAD_H
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#define CHACHA_POLY_AEAD_H
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#include <sys/types.h>
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#include "chacha.h"
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#include "poly1305.h"
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#define CHACHA_KEYLEN 32 /* Only 256 bit keys used here */
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struct chachapoly_ctx {
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struct chacha_ctx main_ctx, header_ctx;
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};
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void chachapoly_init(struct chachapoly_ctx *cpctx,
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const u_char *key, u_int keylen)
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__attribute__((__bounded__(__buffer__, 2, 3)));
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int chachapoly_crypt(struct chachapoly_ctx *cpctx, u_int seqnr,
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u_char *dest, const u_char *src, u_int len, u_int aadlen, u_int authlen,
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int do_encrypt);
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int chachapoly_get_length(struct chachapoly_ctx *cpctx,
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u_int *plenp, u_int seqnr, const u_char *cp, u_int len)
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__attribute__((__bounded__(__buffer__, 4, 5)));
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#endif /* CHACHA_POLY_AEAD_H */
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