aboutsummaryrefslogtreecommitdiffstats
path: root/lib/ssh/src/ssh_message.erl
diff options
context:
space:
mode:
authorIngela Anderton Andin <[email protected]>2013-10-04 16:05:22 +0200
committerIngela Anderton Andin <[email protected]>2013-11-13 10:58:19 +0100
commitd53cea682010766c82ba7088f40efcfafe196621 (patch)
tree6a7794a8863977944d52ec907109ef179d23ffd8 /lib/ssh/src/ssh_message.erl
parenta5128108ad3efff77c5080f0769737e70a0bfd82 (diff)
downloadotp-d53cea682010766c82ba7088f40efcfafe196621.tar.gz
otp-d53cea682010766c82ba7088f40efcfafe196621.tar.bz2
otp-d53cea682010766c82ba7088f40efcfafe196621.zip
ssh: Remove use of process dictionary
This is step one in in making ssh process structure less complicated. As an effect I also found other simplifications/clean ups of the code that could be done.
Diffstat (limited to 'lib/ssh/src/ssh_message.erl')
-rw-r--r--lib/ssh/src/ssh_message.erl519
1 files changed, 519 insertions, 0 deletions
diff --git a/lib/ssh/src/ssh_message.erl b/lib/ssh/src/ssh_message.erl
new file mode 100644
index 0000000000..dc4943ace4
--- /dev/null
+++ b/lib/ssh/src/ssh_message.erl
@@ -0,0 +1,519 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2013-2013. All Rights Reserved.
+%%
+%% The contents of this file are subject to the Erlang Public License,
+%% Version 1.1, (the "License"); you may not use this file except in
+%% compliance with the License. You should have received a copy of the
+%% Erlang Public License along with this software. If not, it can be
+%% retrieved online at http://www.erlang.org/.
+%%
+%% Software distributed under the License is distributed on an "AS IS"
+%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+%% the License for the specific language governing rights and limitations
+%% under the License.
+%%
+%% %CopyrightEnd%
+%%
+
+%%
+
+%%------------------------------------------------------------------
+-module(ssh_message).
+
+-include_lib("public_key/include/public_key.hrl").
+
+-include("ssh.hrl").
+-include("ssh_connect.hrl").
+-include("ssh_auth.hrl").
+-include("ssh_transport.hrl").
+
+-export([encode/1, decode/1, encode_host_key/1]).
+
+encode(#ssh_msg_global_request{
+ name = Name,
+ want_reply = Bool,
+ data = Data}) ->
+ ssh_bits:encode([?SSH_MSG_GLOBAL_REQUEST,
+ Name, Bool, Data], [byte, string, boolean, '...']);
+encode(#ssh_msg_request_success{data = Data}) ->
+ <<?BYTE(?SSH_MSG_REQUEST_SUCCESS), Data/binary>>;
+encode(#ssh_msg_request_failure{}) ->
+ <<?BYTE(?SSH_MSG_REQUEST_FAILURE)>>;
+encode(#ssh_msg_channel_open{
+ channel_type = Type,
+ sender_channel = Sender,
+ initial_window_size = Window,
+ maximum_packet_size = Max,
+ data = Data
+ }) ->
+ ssh_bits:encode([?SSH_MSG_CHANNEL_OPEN,
+ Type, Sender, Window, Max, Data], [byte, string, uint32,
+ uint32, uint32, '...']);
+encode(#ssh_msg_channel_open_confirmation{
+ recipient_channel = Recipient,
+ sender_channel = Sender,
+ initial_window_size = InitWindowSize,
+ maximum_packet_size = MaxPacketSize,
+ data = Data
+ }) ->
+ ssh_bits:encode([?SSH_MSG_CHANNEL_OPEN_CONFIRMATION, Recipient,
+ Sender, InitWindowSize, MaxPacketSize, Data],
+ [byte, uint32, uint32, uint32, uint32, '...']);
+encode(#ssh_msg_channel_open_failure{
+ recipient_channel = Recipient,
+ reason = Reason,
+ description = Desc,
+ lang = Lang
+ }) ->
+ ssh_bits:encode([?SSH_MSG_CHANNEL_OPEN_FAILURE, Recipient,
+ Reason, Desc, Lang], [byte, uint32, uint32, string, string]);
+encode(#ssh_msg_channel_window_adjust{
+ recipient_channel = Recipient,
+ bytes_to_add = Bytes
+ }) ->
+ ssh_bits:encode([?SSH_MSG_CHANNEL_WINDOW_ADJUST, Recipient, Bytes],
+ [byte, uint32, uint32]);
+encode(#ssh_msg_channel_data{
+ recipient_channel = Recipient,
+ data = Data
+ }) ->
+ ssh_bits:encode([?SSH_MSG_CHANNEL_DATA, Recipient, Data], [byte, uint32, binary]);
+
+encode(#ssh_msg_channel_extended_data{
+ recipient_channel = Recipient,
+ data_type_code = DataType,
+ data = Data
+ }) ->
+ ssh_bits:encode([?SSH_MSG_CHANNEL_EXTENDED_DATA, Recipient,
+ DataType, Data], [byte, uint32, uint32, binary]);
+
+encode(#ssh_msg_channel_eof{recipient_channel = Recipient
+ }) ->
+ <<?BYTE(?SSH_MSG_CHANNEL_EOF), ?UINT32(Recipient)>>;
+encode(#ssh_msg_channel_close{
+ recipient_channel = Recipient
+ }) ->
+ <<?BYTE(?SSH_MSG_CHANNEL_CLOSE), ?UINT32(Recipient)>>;
+encode(#ssh_msg_channel_request{
+ recipient_channel = Recipient,
+ request_type = Type,
+ want_reply = Bool,
+ data = Data
+ }) ->
+ ssh_bits:encode([?SSH_MSG_CHANNEL_REQUEST, Recipient, Type, Bool, Data],
+ [byte, uint32, string, boolean, '...']);
+encode(#ssh_msg_channel_success{
+ recipient_channel = Recipient
+ }) ->
+ <<?BYTE(?SSH_MSG_CHANNEL_SUCCESS), ?UINT32(Recipient)>>;
+encode(#ssh_msg_channel_failure{
+ recipient_channel = Recipient
+ }) ->
+ <<?BYTE(?SSH_MSG_CHANNEL_FAILURE), ?UINT32(Recipient)>>;
+
+encode(#ssh_msg_userauth_request{
+ user = User,
+ service = Service,
+ method = Method,
+ data = Data
+ }) ->
+ ssh_bits:encode([?SSH_MSG_USERAUTH_REQUEST, User, Service, Method, Data],
+ [byte, string, string, string, '...']);
+encode(#ssh_msg_userauth_failure{
+ authentications = Auths,
+ partial_success = Bool
+ }) ->
+ ssh_bits:encode([?SSH_MSG_USERAUTH_FAILURE, Auths, Bool],
+ [byte, string, boolean]);
+encode(#ssh_msg_userauth_success{}) ->
+ <<?BYTE(?SSH_MSG_USERAUTH_SUCCESS)>>;
+
+encode(#ssh_msg_userauth_banner{
+ message = Banner,
+ language = Lang
+ }) ->
+ ssh_bits:encode([?SSH_MSG_USERAUTH_BANNER, Banner, Lang],
+ [byte, string, string]);
+
+encode(#ssh_msg_userauth_pk_ok{
+ algorithm_name = Alg,
+ key_blob = KeyBlob
+ }) ->
+ ssh_bits:encode([?SSH_MSG_USERAUTH_PK_OK, Alg, KeyBlob],
+ [byte, string, binary]);
+
+encode(#ssh_msg_userauth_passwd_changereq{prompt = Prompt,
+ languge = Lang
+ })->
+ ssh_bits:encode([?SSH_MSG_USERAUTH_PASSWD_CHANGEREQ, Prompt, Lang],
+ [byte, string, string]);
+
+encode(#ssh_msg_userauth_info_request{
+ name = Name,
+ instruction = Inst,
+ language_tag = Lang,
+ num_prompts = NumPromtps,
+ data = Data}) ->
+ ssh_bits:encode([?SSH_MSG_USERAUTH_INFO_REQUEST, Name, Inst, Lang, NumPromtps, Data],
+ [byte, string, string, string, uint32, '...']);
+
+encode(#ssh_msg_userauth_info_response{
+ num_responses = Num,
+ data = Data}) ->
+ ssh_bits:encode([?SSH_MSG_USERAUTH_INFO_RESPONSE, Num, Data],
+ [byte, uint32, '...']);
+encode(#ssh_msg_disconnect{
+ code = Code,
+ description = Desc,
+ language = Lang
+ }) ->
+ ssh_bits:encode([?SSH_MSG_DISCONNECT, Code, Desc, Lang],
+ [byte, uint32, string, string]);
+
+encode(#ssh_msg_service_request{
+ name = Service
+ }) ->
+ ssh_bits:encode([?SSH_MSG_SERVICE_REQUEST, Service], [byte, string]);
+
+encode(#ssh_msg_service_accept{
+ name = Service
+ }) ->
+ ssh_bits:encode([?SSH_MSG_SERVICE_ACCEPT, Service], [byte, string]);
+
+encode(#ssh_msg_newkeys{}) ->
+ <<?BYTE(?SSH_MSG_NEWKEYS)>>;
+
+encode(#ssh_msg_kexinit{
+ cookie = Cookie,
+ kex_algorithms = KeyAlgs,
+ server_host_key_algorithms = HostKeyAlgs,
+ encryption_algorithms_client_to_server = EncAlgC2S,
+ encryption_algorithms_server_to_client = EncAlgS2C,
+ mac_algorithms_client_to_server = MacAlgC2S,
+ mac_algorithms_server_to_client = MacAlgS2C,
+ compression_algorithms_client_to_server = CompAlgS2C,
+ compression_algorithms_server_to_client = CompAlgC2S,
+ languages_client_to_server = LangC2S,
+ languages_server_to_client = LangS2C,
+ first_kex_packet_follows = Bool,
+ reserved = Reserved
+ }) ->
+ ssh_bits:encode([?SSH_MSG_KEXINIT, Cookie, KeyAlgs, HostKeyAlgs, EncAlgC2S, EncAlgS2C,
+ MacAlgC2S, MacAlgS2C, CompAlgS2C, CompAlgC2S, LangC2S, LangS2C, Bool,
+ Reserved],
+ [byte, cookie,
+ name_list, name_list,
+ name_list, name_list,
+ name_list, name_list,
+ name_list, name_list,
+ name_list, name_list,
+ boolean, uint32]);
+
+encode(#ssh_msg_kexdh_init{e = E}) ->
+ ssh_bits:encode([?SSH_MSG_KEXDH_INIT, E], [byte, mpint]);
+
+encode(#ssh_msg_kexdh_reply{
+ public_host_key = Key,
+ f = F,
+ h_sig = Signature
+ }) ->
+ EncKey = encode_host_key(Key),
+ EncSign = encode_sign(Key, Signature),
+ ssh_bits:encode([?SSH_MSG_KEXDH_REPLY, EncKey, F, EncSign], [byte, binary, mpint, binary]);
+
+encode(#ssh_msg_kex_dh_gex_request{
+ min = Min,
+ n = N,
+ max = Max
+ }) ->
+ ssh_bits:encode([?SSH_MSG_KEX_DH_GEX_REQUEST, Min, N, Max],
+ [byte, uint32, uint32, uint32, uint32]);
+encode(#ssh_msg_kex_dh_gex_request_old{n = N}) ->
+ ssh_bits:encode([?SSH_MSG_KEX_DH_GEX_REQUEST_OLD, N],
+ [byte, uint32]);
+
+encode(#ssh_msg_kex_dh_gex_group{p = Prime, g = Generator}) ->
+ ssh_bits:encode([?SSH_MSG_KEX_DH_GEX_GROUP, Prime, Generator],
+ [byte, mpint, mpint]);
+
+encode(#ssh_msg_kex_dh_gex_reply{
+ %% Will be private key encode_host_key extracts only the public part!
+ public_host_key = Key,
+ f = F,
+ h_sig = Signature
+ }) ->
+ EncKey = encode_host_key(Key),
+ EncSign = encode_sign(Key, Signature),
+ ssh_bits:encode([?SSH_MSG_KEXDH_REPLY, EncKey, F, EncSign], [byte, binary, mpint, binary]);
+
+encode(#ssh_msg_ignore{data = Data}) ->
+ ssh_bits:encode([?SSH_MSG_IGNORE, Data], [byte, string]);
+
+encode(#ssh_msg_unimplemented{sequence = Seq}) ->
+ ssh_bits:encode([?SSH_MSG_IGNORE, Seq], [byte, uint32]);
+
+encode(#ssh_msg_debug{always_display = Bool,
+ message = Msg,
+ language = Lang}) ->
+ ssh_bits:encode([?SSH_MSG_DEBUG, Bool, Msg, Lang], [byte, boolean, string, string]).
+
+
+%% Connection Messages
+decode(<<?BYTE(?SSH_MSG_GLOBAL_REQUEST), ?UINT32(Len), Name:Len/binary,
+ ?BYTE(Bool), Data/binary>>) ->
+ #ssh_msg_global_request{
+ name = Name,
+ want_reply = erl_boolean(Bool),
+ data = Data
+ };
+decode(<<?BYTE(?SSH_MSG_REQUEST_SUCCESS), Data/binary>>) ->
+ #ssh_msg_request_success{data = Data};
+decode(<<?BYTE(?SSH_MSG_REQUEST_FAILURE)>>) ->
+ #ssh_msg_request_failure{};
+decode(<<?BYTE(?SSH_MSG_CHANNEL_OPEN),
+ ?UINT32(Len), Type:Len/binary,
+ ?UINT32(Sender), ?UINT32(Window), ?UINT32(Max),
+ Data/binary>>) ->
+ #ssh_msg_channel_open{
+ channel_type = binary_to_list(Type),
+ sender_channel = Sender,
+ initial_window_size = Window,
+ maximum_packet_size = Max,
+ data = Data
+ };
+decode(<<?BYTE(?SSH_MSG_CHANNEL_OPEN_CONFIRMATION), ?UINT32(Recipient), ?UINT32(Sender),
+ ?UINT32(InitWindowSize), ?UINT32(MaxPacketSize),
+ Data/binary>>) ->
+ #ssh_msg_channel_open_confirmation{
+ recipient_channel = Recipient,
+ sender_channel = Sender,
+ initial_window_size = InitWindowSize,
+ maximum_packet_size = MaxPacketSize,
+ data = Data
+ };
+decode(<<?BYTE(?SSH_MSG_CHANNEL_OPEN_FAILURE), ?UINT32(Recipient), ?UINT32(Reason),
+ ?UINT32(Len0), Desc:Len0/binary, ?UINT32(Len1), Lang:Len1/binary >>) ->
+ #ssh_msg_channel_open_failure{
+ recipient_channel = Recipient,
+ reason = Reason,
+ description = unicode:characters_to_list(Desc),
+ lang = Lang
+ };
+decode(<<?BYTE(?SSH_MSG_CHANNEL_WINDOW_ADJUST), ?UINT32(Recipient), ?UINT32(Bytes)>>) ->
+ #ssh_msg_channel_window_adjust{
+ recipient_channel = Recipient,
+ bytes_to_add = Bytes
+ };
+
+decode(<<?BYTE(?SSH_MSG_CHANNEL_DATA), ?UINT32(Recipient), ?UINT32(Len), Data:Len/binary>>) ->
+ #ssh_msg_channel_data{
+ recipient_channel = Recipient,
+ data = Data
+ };
+decode(<<?BYTE(?SSH_MSG_CHANNEL_EXTENDED_DATA), ?UINT32(Recipient),
+ ?UINT32(DataType), Data/binary>>) ->
+ #ssh_msg_channel_extended_data{
+ recipient_channel = Recipient,
+ data_type_code = DataType,
+ data = Data
+ };
+decode(<<?BYTE(?SSH_MSG_CHANNEL_EOF), ?UINT32(Recipient)>>) ->
+ #ssh_msg_channel_eof{
+ recipient_channel = Recipient
+ };
+decode(<<?BYTE(?SSH_MSG_CHANNEL_CLOSE), ?UINT32(Recipient)>>) ->
+ #ssh_msg_channel_close{
+ recipient_channel = Recipient
+ };
+decode(<<?BYTE(?SSH_MSG_CHANNEL_REQUEST), ?UINT32(Recipient),
+ ?UINT32(Len), RequestType:Len/binary,
+ ?BYTE(Bool), Data/binary>>) ->
+ #ssh_msg_channel_request{
+ recipient_channel = Recipient,
+ request_type = unicode:characters_to_list(RequestType),
+ want_reply = erl_boolean(Bool),
+ data = Data
+ };
+decode(<<?BYTE(?SSH_MSG_CHANNEL_SUCCESS), ?UINT32(Recipient)>>) ->
+ #ssh_msg_channel_success{
+ recipient_channel = Recipient
+ };
+decode(<<?BYTE(?SSH_MSG_CHANNEL_FAILURE), ?UINT32(Recipient)>>) ->
+ #ssh_msg_channel_failure{
+ recipient_channel = Recipient
+ };
+
+%%% Auth Messages
+decode(<<?BYTE(?SSH_MSG_USERAUTH_REQUEST),
+ ?UINT32(Len0), User:Len0/binary,
+ ?UINT32(Len1), Service:Len1/binary,
+ ?UINT32(Len2), Method:Len2/binary,
+ Data/binary>>) ->
+ #ssh_msg_userauth_request{
+ user = unicode:characters_to_list(User),
+ service = unicode:characters_to_list(Service),
+ method = unicode:characters_to_list(Method),
+ data = Data
+ };
+
+decode(<<?BYTE(?SSH_MSG_USERAUTH_FAILURE),
+ ?UINT32(Len0), Auths:Len0/binary,
+ ?BYTE(Bool)>>) ->
+ #ssh_msg_userauth_failure {
+ authentications = unicode:characters_to_list(Auths),
+ partial_success = erl_boolean(Bool)
+ };
+
+decode(<<?BYTE(?SSH_MSG_USERAUTH_SUCCESS)>>) ->
+ #ssh_msg_userauth_success{};
+
+decode(<<?BYTE(?SSH_MSG_USERAUTH_BANNER),
+ ?UINT32(Len0), Banner:Len0/binary,
+ ?UINT32(Len1), Lang:Len1/binary>>) ->
+ #ssh_msg_userauth_banner{
+ message = Banner,
+ language = Lang
+ };
+
+decode(<<?BYTE(?SSH_MSG_USERAUTH_PK_OK), ?UINT32(Len), Alg:Len/binary, KeyBlob/binary>>) ->
+ #ssh_msg_userauth_pk_ok{
+ algorithm_name = Alg,
+ key_blob = KeyBlob
+ };
+
+decode(<<?BYTE(?SSH_MSG_USERAUTH_PASSWD_CHANGEREQ), ?UINT32(Len0), Prompt:Len0/binary,
+ ?UINT32(Len1), Lang:Len1/binary>>) ->
+ #ssh_msg_userauth_passwd_changereq{
+ prompt = Prompt,
+ languge = Lang
+ };
+decode(<<?BYTE(?SSH_MSG_USERAUTH_INFO_REQUEST), ?UINT32(Len0), Name:Len0/binary,
+ ?UINT32(Len1), Inst:Len1/binary, ?UINT32(Len2), Lang:Len2/binary,
+ ?UINT32(NumPromtps), Data/binary>>) ->
+ #ssh_msg_userauth_info_request{
+ name = Name,
+ instruction = Inst,
+ language_tag = Lang,
+ num_prompts = NumPromtps,
+ data = Data};
+
+decode(<<?BYTE(?SSH_MSG_USERAUTH_INFO_RESPONSE), ?UINT32(Num), Data/binary>>) ->
+ #ssh_msg_userauth_info_response{
+ num_responses = Num,
+ data = Data};
+
+%%% Keyexchange messages
+decode(<<?BYTE(?SSH_MSG_KEXINIT), Cookie:128, Data/binary>>) ->
+ decode_kex_init(Data, [Cookie, ssh_msg_kexinit], 10);
+
+decode(<<?BYTE(?SSH_MSG_KEXDH_INIT), ?UINT32(Len), E:Len/binary>>) ->
+ #ssh_msg_kexdh_init{e = erlint(Len, E)
+ };
+decode(<<?BYTE(?SSH_MSG_KEX_DH_GEX_REQUEST), ?UINT32(Min), ?UINT32(N), ?UINT32(Max)>>) ->
+ #ssh_msg_kex_dh_gex_request{
+ min = Min,
+ n = N,
+ max = Max
+ };
+decode(<<?BYTE(?SSH_MSG_KEX_DH_GEX_REQUEST_OLD), ?UINT32(N)>>) ->
+ #ssh_msg_kex_dh_gex_request_old{
+ n = N
+ };
+decode(<<?BYTE(?SSH_MSG_KEX_DH_GEX_GROUP), ?UINT32(Len0), Prime:Len0/big-signed-integer,
+ ?UINT32(Len1), Generator:Len1/big-signed-integer>>) ->
+ #ssh_msg_kex_dh_gex_group{
+ p = Prime,
+ g = Generator
+ };
+decode(<<?BYTE(?SSH_MSG_KEXDH_REPLY), ?UINT32(Len0), Key:Len0/binary,
+ ?UINT32(Len1), F:Len1/binary,
+ ?UINT32(Len2), Hashsign:Len2/binary>>) ->
+ #ssh_msg_kexdh_reply{
+ public_host_key = decode_host_key(Key),
+ f = erlint(Len1, F),
+ h_sig = decode_sign(Hashsign)
+ };
+
+decode(<<?SSH_MSG_SERVICE_REQUEST, ?UINT32(Len0), Service:Len0/binary>>) ->
+ #ssh_msg_service_request{
+ name = unicode:characters_to_list(Service)
+ };
+
+decode(<<?SSH_MSG_SERVICE_ACCEPT, ?UINT32(Len0), Service:Len0/binary>>) ->
+ #ssh_msg_service_accept{
+ name = unicode:characters_to_list(Service)
+ };
+
+decode(<<?BYTE(?SSH_MSG_DISCONNECT), ?UINT32(Code),
+ ?UINT32(Len0), Desc:Len0/binary, ?UINT32(Len1), Lang:Len1/binary>>) ->
+ #ssh_msg_disconnect{
+ code = Code,
+ description = unicode:characters_to_list(Desc),
+ language = Lang
+ };
+
+decode(<<?SSH_MSG_NEWKEYS>>) ->
+ #ssh_msg_newkeys{};
+
+decode(<<?BYTE(?SSH_MSG_IGNORE), Data/binary>>) ->
+ #ssh_msg_ignore{data = Data};
+
+decode(<<?BYTE(?SSH_MSG_UNIMPLEMENTED), ?UINT32(Seq)>>) ->
+ #ssh_msg_unimplemented{sequence = Seq};
+
+decode(<<?BYTE(?SSH_MSG_DEBUG), ?BYTE(Bool), ?UINT32(Len0), Msg:Len0/binary,
+ ?UINT32(Len1), Lang:Len1/binary>>) ->
+ #ssh_msg_debug{always_display = erl_boolean(Bool),
+ message = Msg,
+ language = Lang}.
+erl_boolean(0) ->
+ false;
+erl_boolean(1) ->
+ true.
+
+decode_kex_init(<<?BYTE(Bool), ?UINT32(X)>>, Acc, 0) ->
+ list_to_tuple(lists:reverse([X, erl_boolean(Bool) | Acc]));
+decode_kex_init(<<?UINT32(Len), Data:Len/binary, Rest/binary>>, Acc, N) ->
+ Names = string:tokens(unicode:characters_to_list(Data), ","),
+ decode_kex_init(Rest, [Names | Acc], N -1).
+
+erlint(MPIntSize, MPIntValue) ->
+ Bits = MPIntSize * 8,
+ <<Integer:Bits/integer>> = MPIntValue,
+ Integer.
+
+decode_sign(<<?UINT32(Len), _Alg:Len/binary, ?UINT32(_), Signature/binary>>) ->
+ Signature.
+
+decode_host_key(<<?UINT32(Len), Alg:Len/binary, Rest/binary>>) ->
+ decode_host_key(Alg, Rest).
+
+decode_host_key(<<"ssh-rsa">>, <<?UINT32(Len0), E:Len0/binary,
+ ?UINT32(Len1), N:Len1/binary>>) ->
+ #'RSAPublicKey'{publicExponent = erlint(Len0, E),
+ modulus = erlint(Len1, N)};
+
+decode_host_key(<<"ssh-dss">>,
+ <<?UINT32(Len0), P:Len0/binary,
+ ?UINT32(Len1), Q:Len1/binary,
+ ?UINT32(Len2), G:Len2/binary,
+ ?UINT32(Len3), Y:Len3/binary>>) ->
+ {erlint(Len3, Y), #'Dss-Parms'{p = erlint(Len0, P), q = erlint(Len1, Q),
+ g = erlint(Len2, G)}}.
+
+encode_host_key(#'RSAPublicKey'{modulus = N, publicExponent = E}) ->
+ ssh_bits:encode(["ssh-rsa", E, N], [string, mpint, mpint]);
+encode_host_key({Y, #'Dss-Parms'{p = P, q = Q, g = G}}) ->
+ ssh_bits:encode(["ssh-dss", P, Q, G, Y],
+ [string, mpint, mpint, mpint, mpint]);
+encode_host_key(#'RSAPrivateKey'{modulus = N, publicExponent = E}) ->
+ ssh_bits:encode(["ssh-rsa", E, N], [string, mpint, mpint]);
+encode_host_key(#'DSAPrivateKey'{y = Y, p = P, q = Q, g = G}) ->
+ ssh_bits:encode(["ssh-dss", P, Q, G, Y],
+ [string, mpint, mpint, mpint, mpint]).
+encode_sign(#'RSAPrivateKey'{}, Signature) ->
+ ssh_bits:encode(["ssh-rsa", Signature],[string, binary]);
+encode_sign(#'DSAPrivateKey'{}, Signature) ->
+ ssh_bits:encode(["ssh-dss", Signature],[string, binary]).