diff options
| author |   djm <djm@openbsd.org> | 2013-11-21 00:45:43 +0000 |
|---|---|---|
| committer | djm <djm@openbsd.org> | 2013-11-21 00:45:43 +0000 |
| commit | 1edbfe239db2487faa56c5fb5877105e3018932c (patch) | |
| tree | d5cbb0444e798f9ca43091e45c4a31f1498e401f /usr.bin/ssh/packet.c | |
| parent | remove the #define b_cylinder b_resid from bufs. i hated the (diff) | |
| download | wireguard-openbsd-1edbfe239db2487faa56c5fb5877105e3018932c.tar.xz wireguard-openbsd-1edbfe239db2487faa56c5fb5877105e3018932c.zip | |
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@
Diffstat (limited to 'usr.bin/ssh/packet.c')
| -rw-r--r-- | usr.bin/ssh/packet.c | 24 |
1 files changed, 14 insertions, 10 deletions
diff --git a/usr.bin/ssh/packet.c b/usr.bin/ssh/packet.c index 0b79d1677a2..e8614966c84 100644 --- a/usr.bin/ssh/packet.c +++ b/usr.bin/ssh/packet.c @@ -1,4 +1,4 @@ -/* $OpenBSD: packet.c,v 1.189 2013/11/08 00:39:15 djm Exp $ */ +/* $OpenBSD: packet.c,v 1.190 2013/11/21 00:45:44 djm Exp $ */ /* * Author: Tatu Ylonen <ylo@cs.hut.fi> * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland @@ -702,7 +702,7 @@ packet_send1(void) buffer_append(&active_state->output, buf, 4); cp = buffer_append_space(&active_state->output, buffer_len(&active_state->outgoing_packet)); - cipher_crypt(&active_state->send_context, cp, + cipher_crypt(&active_state->send_context, 0, cp, buffer_ptr(&active_state->outgoing_packet), buffer_len(&active_state->outgoing_packet), 0, 0); @@ -935,8 +935,8 @@ packet_send2_wrapped(void) } /* encrypt packet and append to output buffer. */ cp = buffer_append_space(&active_state->output, len + authlen); - cipher_crypt(&active_state->send_context, cp, - buffer_ptr(&active_state->outgoing_packet), + cipher_crypt(&active_state->send_context, active_state->p_send.seqnr, + cp, buffer_ptr(&active_state->outgoing_packet), len - aadlen, aadlen, authlen); /* append unencrypted MAC */ if (mac && mac->enabled) { @@ -1196,7 +1196,7 @@ packet_read_poll1(void) /* Decrypt data to incoming_packet. */ buffer_clear(&active_state->incoming_packet); cp = buffer_append_space(&active_state->incoming_packet, padded_len); - cipher_crypt(&active_state->receive_context, cp, + cipher_crypt(&active_state->receive_context, 0, cp, buffer_ptr(&active_state->input), padded_len, 0, 0); buffer_consume(&active_state->input, padded_len); @@ -1267,10 +1267,12 @@ packet_read_poll2(u_int32_t *seqnr_p) aadlen = (mac && mac->enabled && mac->etm) || authlen ? 4 : 0; if (aadlen && active_state->packlen == 0) { - if (buffer_len(&active_state->input) < 4) + if (cipher_get_length(&active_state->receive_context, + &active_state->packlen, + active_state->p_read.seqnr, + buffer_ptr(&active_state->input), + buffer_len(&active_state->input)) != 0) return SSH_MSG_NONE; - cp = buffer_ptr(&active_state->input); - active_state->packlen = get_u32(cp); if (active_state->packlen < 1 + 4 || active_state->packlen > PACKET_MAX_SIZE) { #ifdef PACKET_DEBUG @@ -1290,7 +1292,8 @@ packet_read_poll2(u_int32_t *seqnr_p) buffer_clear(&active_state->incoming_packet); cp = buffer_append_space(&active_state->incoming_packet, block_size); - cipher_crypt(&active_state->receive_context, cp, + cipher_crypt(&active_state->receive_context, + active_state->p_read.seqnr, cp, buffer_ptr(&active_state->input), block_size, 0, 0); cp = buffer_ptr(&active_state->incoming_packet); active_state->packlen = get_u32(cp); @@ -1345,7 +1348,8 @@ packet_read_poll2(u_int32_t *seqnr_p) macbuf = mac_compute(mac, active_state->p_read.seqnr, buffer_ptr(&active_state->input), aadlen + need); cp = buffer_append_space(&active_state->incoming_packet, aadlen + need); - cipher_crypt(&active_state->receive_context, cp, + cipher_crypt(&active_state->receive_context, + active_state->p_read.seqnr, cp, buffer_ptr(&active_state->input), need, aadlen, authlen); buffer_consume(&active_state->input, aadlen + need + authlen); /* |