Merge branch 'ia/ssh/test-maint' into maint

* ia/ssh/test-maint:
  Remove generation of new test keys, use checked in test keys
  Improve test case structure so that test should pass on all platforms
  Exec test case should ignore stderr messages
  Do not run ssh_to_openssh_SUITE if there is no oppenssh server running

1 files changed, 31 insertions, 459 deletions

diff --git a/lib/ssh/test/ssh_test_lib.erl b/lib/ssh/test/ssh_test_lib.erl
index 425fae22c1..f4e95f9bfb 100644
--- a/lib/ssh/test/ssh_test_lib.erl
+++ b/lib/ssh/test/ssh_test_lib.erl
@@ -1,7 +1,7 @@
 %%
 %% %CopyrightBegin%
 %%
-%% Copyright Ericsson AB 2004-2011. All Rights Reserved.
+%% Copyright Ericsson AB 2004-2012. 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
@@ -68,15 +68,11 @@ daemon(Host, Port, Options) ->
 	    Error
     end.
 
+start_shell(Port, IOServer, UserDir) ->
+    spawn_link(?MODULE, init_shell, [Port, IOServer, [{user_dir, UserDir}]]).
 
-
-
-start_shell(Port, IOServer) ->
-    spawn_link(?MODULE, init_shell, [Port, IOServer]).
-
-init_shell(Port, IOServer) ->
+init_shell(Port, IOServer, UserDir) ->
     Host = hostname(),
-    UserDir = get_user_dir(),
     Options = [{user_interaction, false}, {silently_accept_hosts,
 					   true}] ++ UserDir,
     group_leader(IOServer, self()),
@@ -139,12 +135,18 @@ reply(TestCase, Result) ->
 receive_exec_result(Msg) ->
     test_server:format("Expect data! ~p", [Msg]),
     receive
+	{ssh_cm,_,{data,_,1, Data}} ->
+	    test_server:format("StdErr: ~p~n", [Data]),
+	    receive_exec_result(Msg);
 	Msg ->
 	    test_server:format("1: Collected data ~p", [Msg]),
 	    expected;
 	Other ->
+	    test_server:format("Other ~p", [Other]),
 	    {unexpected_msg, Other}
     end.
+
+
 receive_exec_end(ConnectionRef, ChannelId) ->
     Eof = {ssh_cm, ConnectionRef, {eof, ChannelId}},
     ExitStatus = {ssh_cm, ConnectionRef, {exit_status, ChannelId, 0}},
@@ -198,9 +200,16 @@ remove_id_keys(Dir) ->
     file:delete(filename:join(Dir, "id_rsa")),
     file:delete(filename:join(Dir, "id_dsa")).
 
-copyfile(SrcDir, DstDir, Fn) ->
-    file:copy(filename:join(SrcDir, Fn),
-	      filename:join(DstDir, Fn)).
+copyfile(SrcDir, DstDir, FileName) ->
+    Dest = filename:join(DstDir, FileName),
+    Result = file:copy(filename:join(SrcDir, FileName), Dest),
+    {ok, Pem} = file:read_file(Dest),
+    case public_key:pem_decode(Pem) of
+	[{_,_, not_encrypted}] ->
+	    Result;
+	_ ->
+	   {error, "Has pass phrase can not be used by automated test case"} 
+    end.
 
 failfun(_User, {authmethod,none}) ->
     ok;
@@ -222,39 +231,11 @@ known_hosts(BR) ->
 	    file:rename(B, KnownHosts)
     end.
 
-
-get_user_dir() ->
-    case os:type() of
-	{win32, _} ->
-	    [{user_dir, filename:join([os:getenv("HOME"), ".ssh"])}];
-	_ ->
-	    []
-    end.
-
-
-make_dsa_cert_files(Config) ->    
-    make_dsa_cert_files("", Config).
-
-make_dsa_cert_files(RoleStr, Config) ->    
-    
-    CaInfo = {CaCert, _} = make_cert([{key, dsa}]),
-    {Cert, CertKey} = make_cert([{key, dsa}, {issuer, CaInfo}]),
-    CaCertFile = filename:join([?config(data_dir, Config), 
- 				RoleStr, "dsa_cacerts.pem"]),
-    CertFile = filename:join([?config(data_dir, Config), 
- 			      RoleStr, "dsa_cert.pem"]),
-    KeyFile = filename:join([?config(data_dir, Config), 
-			     RoleStr, "dsa_key.pem"]),
-    
-    der_to_pem(CaCertFile, [{'Certificate', CaCert, not_encrypted}]),
-    der_to_pem(CertFile, [{'Certificate', Cert, not_encrypted}]),
-    der_to_pem(KeyFile, [CertKey]),
-    {CaCertFile, CertFile, KeyFile}.
-
-make_dsa_files(Config) ->
-    make_dsa_files(Config, rfc4716_public_key).
-make_dsa_files(Config, Type) ->
-    {DSA, EncodedKey} = ssh_test_lib:gen_dsa(128, 20),
+setup_dsa(DataDir, UserDir) ->
+    ssh_test_lib:copyfile(DataDir, UserDir, "ssh_host_dsa_key"),
+    ssh_test_lib:copyfile(DataDir, UserDir, "ssh_host_dsa_key.pub"),
+    {ok, Pem} = file:read_file(filename:join(UserDir, "ssh_host_dsa_key")),
+    DSA = public_key:pem_entry_decode(hd(public_key:pem_decode(Pem))),
     PKey = DSA#'DSAPrivateKey'.y,
     P = DSA#'DSAPrivateKey'.p,
     Q = DSA#'DSAPrivateKey'.q,
@@ -263,422 +244,13 @@ make_dsa_files(Config, Type) ->
     {ok, Hostname} = inet:gethostname(),
     {ok, {A, B, C, D}} = inet:getaddr(Hostname, inet),
     IP = lists:concat([A, ".", B, ".", C, ".", D]),
-    Attributes = [], % Could be [{comment,"user@" ++ Hostname}],
     HostNames = [{hostnames,[IP, IP]}],
-    PublicKey = [{{PKey, Dss}, Attributes}],
     KnownHosts = [{{PKey, Dss}, HostNames}],
-
     KnownHostsEnc = public_key:ssh_encode(KnownHosts, known_hosts),
-    KnownHosts = public_key:ssh_decode(KnownHostsEnc, known_hosts),
-
-    PublicKeyEnc = public_key:ssh_encode(PublicKey, Type),
-%    PublicKey = public_key:ssh_decode(PublicKeyEnc, Type),
-
-    SystemTmpDir = ?config(data_dir, Config),
-    filelib:ensure_dir(SystemTmpDir),
-    file:make_dir(SystemTmpDir),
-    
-    DSAFile = filename:join(SystemTmpDir, "ssh_host_dsa_key.pub"),
-    file:delete(DSAFile),
-    
-    DSAPrivateFile  = filename:join(SystemTmpDir, "ssh_host_dsa_key"),
-    file:delete(DSAPrivateFile),
-
-    KHFile = filename:join(SystemTmpDir, "known_hosts"),
-    file:delete(KHFile),
-    
-    PemBin = public_key:pem_encode([EncodedKey]),
-
-    file:write_file(DSAFile, PublicKeyEnc),
-    file:write_file(KHFile, KnownHostsEnc),
-    file:write_file(DSAPrivateFile, PemBin),
-    ok.
-
-%%--------------------------------------------------------------------
-%% Create and return a der encoded certificate
-%%   Option                                         Default
-%%   -------------------------------------------------------
-%%   digest                                         sha1
-%%   validity                                       {date(), date() + week()}
-%%   version                                        3
-%%   subject                                        [] list of the following content
-%%      {name,  Name}
-%%      {email, Email} 
-%%      {city,  City}
-%%      {state, State}
-%%      {org, Org}
-%%      {org_unit, OrgUnit}
-%%      {country, Country} 
-%%      {serial, Serial}
-%%      {title, Title}
-%%      {dnQualifer, DnQ}
-%%   issuer = {Issuer, IssuerKey}                   true (i.e. a ca cert is created) 
-%%                                                  (obs IssuerKey migth be {Key, Password}
-%%   key = KeyFile|KeyBin|rsa|dsa                   Subject PublicKey rsa or dsa generates key
-%%   
-%%
-%%   (OBS: The generated keys are for testing only)
-%% make_cert([{::atom(), ::term()}]) -> {Cert::binary(), Key::binary()}
-%%--------------------------------------------------------------------
-make_cert(Opts) ->
-    SubjectPrivateKey = get_key(Opts),
-    {TBSCert, IssuerKey} = make_tbs(SubjectPrivateKey, Opts),
-    Cert = public_key:pkix_sign(TBSCert, IssuerKey),
-    true = verify_signature(Cert, IssuerKey, undef), %% verify that the keys where ok
-    {Cert, encode_key(SubjectPrivateKey)}.
-
-%%--------------------------------------------------------------------
-%% Writes cert files in Dir with FileName and FileName ++ Suffix
-%% write_cert(::string(), ::string(), {Cert,Key}) -> ok
-%%--------------------------------------------------------------------
-write_cert(Dir, FileName, Suffix, {Cert, Key = {_,_,not_encrypted}}) when is_binary(Cert) ->
-    ok = der_to_pem(filename:join(Dir, FileName),
-			       [{'Certificate', Cert, not_encrypted}]),
-    ok = der_to_pem(filename:join(Dir, FileName ++ Suffix), [Key]).
-
-%%--------------------------------------------------------------------
-%% Creates a rsa key (OBS: for testing only)
-%%   the size are in bytes
-%% gen_rsa(::integer()) -> {::atom(), ::binary(), ::opaque()}
-%%--------------------------------------------------------------------
-gen_rsa(Size) when is_integer(Size) ->
-    Key = gen_rsa2(Size),
-    {Key, encode_key(Key)}.
-
-%%--------------------------------------------------------------------
-%% Creates a dsa key (OBS: for testing only)
-%%   the sizes are in bytes
-%% gen_dsa(::integer()) -> {::atom(), ::binary(), ::opaque()}
-%%--------------------------------------------------------------------
-gen_dsa(LSize,NSize) when is_integer(LSize), is_integer(NSize) ->
-    Key = gen_dsa2(LSize, NSize),
-    {Key, encode_key(Key)}.
-
-%%--------------------------------------------------------------------
-%% Verifies cert signatures
-%% verify_signature(::binary(), ::tuple()) -> ::boolean()
-%%--------------------------------------------------------------------
-verify_signature(DerEncodedCert, DerKey, _KeyParams) ->
-    Key = decode_key(DerKey),
-    case Key of 
-	#'RSAPrivateKey'{modulus=Mod, publicExponent=Exp} ->
-	    public_key:pkix_verify(DerEncodedCert, 
-				   #'RSAPublicKey'{modulus=Mod, publicExponent=Exp});
-	#'DSAPrivateKey'{p=P, q=Q, g=G, y=Y} ->
-	    public_key:pkix_verify(DerEncodedCert, {Y, #'Dss-Parms'{p=P, q=Q, g=G}})
-    end.
-
-%%%%%%%%%%%%%%%%%%%%%%%%% Implementation %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
-get_key(Opts) ->
-    case proplists:get_value(key, Opts) of
-	undefined -> make_key(rsa, Opts);
-	rsa ->       make_key(rsa, Opts);
-	dsa ->       make_key(dsa, Opts);
-	Key ->
-	    Password = proplists:get_value(password, Opts, no_passwd),
-	    decode_key(Key, Password)
-    end.
-
-decode_key({Key, Pw}) ->
-    decode_key(Key, Pw);
-decode_key(Key) ->
-    decode_key(Key, no_passwd).
-    
-
-decode_key(#'RSAPublicKey'{} = Key,_) ->
-    Key;
-decode_key(#'RSAPrivateKey'{} = Key,_) ->
-    Key;
-decode_key(#'DSAPrivateKey'{} = Key,_) ->
-    Key;
-decode_key(PemEntry = {_,_,_}, Pw) ->
-    public_key:pem_entry_decode(PemEntry, Pw);
-decode_key(PemBin, Pw) ->
-    [KeyInfo] = public_key:pem_decode(PemBin),
-    decode_key(KeyInfo, Pw).
-
-encode_key(Key = #'RSAPrivateKey'{}) ->
-    {ok, Der} = 'OTP-PUB-KEY':encode('RSAPrivateKey', Key),
-    {'RSAPrivateKey', list_to_binary(Der), not_encrypted};   
-encode_key(Key = #'DSAPrivateKey'{}) ->
-    {ok, Der} = 'OTP-PUB-KEY':encode('DSAPrivateKey', Key),
-    {'DSAPrivateKey', list_to_binary(Der), not_encrypted}.
-
-make_tbs(SubjectKey, Opts) ->    
-    Version = list_to_atom("v"++integer_to_list(proplists:get_value(version, Opts, 3))),
-
-    IssuerProp = proplists:get_value(issuer, Opts, true),
-    {Issuer, IssuerKey}  = issuer(IssuerProp, Opts, SubjectKey),
-
-    {Algo, Parameters} = sign_algorithm(IssuerKey, Opts),
-    
-    SignAlgo = #'SignatureAlgorithm'{algorithm  = Algo,
-				     parameters = Parameters},    
-    Subject = case IssuerProp of
-		  true -> %% Is a Root Ca
-		      Issuer;
-		  _ ->
-		      subject(proplists:get_value(subject, Opts),false)
-	      end,
-
-    {#'OTPTBSCertificate'{serialNumber = trunc(random:uniform()*100000000)*10000 + 1,
-			  signature    = SignAlgo,
-			  issuer       = Issuer,
-			  validity     = validity(Opts),
-			  subject      = Subject,
-			  subjectPublicKeyInfo = publickey(SubjectKey),
-			  version      = Version,
-			  extensions   = extensions(Opts)
-			 }, IssuerKey}.
-
-issuer(true, Opts, SubjectKey) ->
-    %% Self signed
-    {subject(proplists:get_value(subject, Opts), true), SubjectKey};
-issuer({Issuer, IssuerKey}, _Opts, _SubjectKey) when is_binary(Issuer) ->
-    {issuer_der(Issuer), decode_key(IssuerKey)};
-issuer({File, IssuerKey}, _Opts, _SubjectKey) when is_list(File) ->
-    {ok, [{cert, Cert, _}|_]} = pem_to_der(File),
-    {issuer_der(Cert), decode_key(IssuerKey)}.
-
-issuer_der(Issuer) ->
-    Decoded = public_key:pkix_decode_cert(Issuer, otp),
-    #'OTPCertificate'{tbsCertificate=Tbs} = Decoded,
-    #'OTPTBSCertificate'{subject=Subject} = Tbs,
-    Subject.
-
-subject(undefined, IsRootCA) ->
-    User = if IsRootCA -> "RootCA"; true -> os:getenv("USER") end,
-    Opts = [{email, User ++ "@erlang.org"},
-	    {name, User},
-	    {city, "Stockholm"},
-	    {country, "SE"},
-	    {org, "erlang"},
-	    {org_unit, "testing dep"}],
-    subject(Opts);
-subject(Opts, _) ->
-    subject(Opts).
-
-subject(SubjectOpts) when is_list(SubjectOpts) ->
-    Encode = fun(Opt) ->
-		     {Type,Value} = subject_enc(Opt),
-		     [#'AttributeTypeAndValue'{type=Type, value=Value}]
-	     end,
-    {rdnSequence, [Encode(Opt) || Opt <- SubjectOpts]}.
-
-%% Fill in the blanks
-subject_enc({name,  Name}) ->       {?'id-at-commonName', {printableString, Name}};
-subject_enc({email, Email}) ->      {?'id-emailAddress', Email};
-subject_enc({city,  City}) ->       {?'id-at-localityName', {printableString, City}};
-subject_enc({state, State}) ->      {?'id-at-stateOrProvinceName', {printableString, State}};
-subject_enc({org, Org}) ->          {?'id-at-organizationName', {printableString, Org}};
-subject_enc({org_unit, OrgUnit}) -> {?'id-at-organizationalUnitName', {printableString, OrgUnit}};
-subject_enc({country, Country}) ->  {?'id-at-countryName', Country};
-subject_enc({serial, Serial}) ->    {?'id-at-serialNumber', Serial};
-subject_enc({title, Title}) ->      {?'id-at-title', {printableString, Title}};
-subject_enc({dnQualifer, DnQ}) ->   {?'id-at-dnQualifier', DnQ};
-subject_enc(Other) ->               Other.
-
-
-extensions(Opts) ->
-    case proplists:get_value(extensions, Opts, []) of
-	false -> 
-	    asn1_NOVALUE;
-	Exts  -> 
-	    lists:flatten([extension(Ext) || Ext <- default_extensions(Exts)])
-    end.
-
-default_extensions(Exts) ->
-    Def = [{key_usage,undefined}, 
-	   {subject_altname, undefined},
-	   {issuer_altname, undefined},
-	   {basic_constraints, default},
-	   {name_constraints, undefined},
-	   {policy_constraints, undefined},
-	   {ext_key_usage, undefined},
-	   {inhibit_any, undefined},
-	   {auth_key_id, undefined},
-	   {subject_key_id, undefined},
-	   {policy_mapping, undefined}],
-    Filter = fun({Key, _}, D) -> lists:keydelete(Key, 1, D) end,
-    Exts ++ lists:foldl(Filter, Def, Exts).
-       	
-extension({_, undefined}) -> [];
-extension({basic_constraints, Data}) ->
-    case Data of
-	default ->
-	    #'Extension'{extnID = ?'id-ce-basicConstraints',
-			 extnValue = #'BasicConstraints'{cA=true},
-			 critical=true};
-	false -> 
-	    [];
-	Len when is_integer(Len) ->
-	    #'Extension'{extnID = ?'id-ce-basicConstraints',
-			 extnValue = #'BasicConstraints'{cA=true, pathLenConstraint=Len},
-			 critical=true};
-	_ ->
-	    #'Extension'{extnID = ?'id-ce-basicConstraints',
-			 extnValue = Data}
-    end;
-extension({Id, Data, Critical}) ->
-    #'Extension'{extnID = Id, extnValue = Data, critical = Critical}.
-
-
-publickey(#'RSAPrivateKey'{modulus=N, publicExponent=E}) ->
-    Public = #'RSAPublicKey'{modulus=N, publicExponent=E},
-    Algo = #'PublicKeyAlgorithm'{algorithm= ?rsaEncryption, parameters='NULL'},
-    #'OTPSubjectPublicKeyInfo'{algorithm = Algo,
-			       subjectPublicKey = Public};
-publickey(#'DSAPrivateKey'{p=P, q=Q, g=G, y=Y}) ->
-    Algo = #'PublicKeyAlgorithm'{algorithm= ?'id-dsa', 
-				 parameters={params, #'Dss-Parms'{p=P, q=Q, g=G}}},
-    #'OTPSubjectPublicKeyInfo'{algorithm = Algo, subjectPublicKey = Y}.
-
-validity(Opts) ->
-    DefFrom0 = calendar:gregorian_days_to_date(calendar:date_to_gregorian_days(date())-1),
-    DefTo0   = calendar:gregorian_days_to_date(calendar:date_to_gregorian_days(date())+7),
-    {DefFrom, DefTo} = proplists:get_value(validity, Opts, {DefFrom0, DefTo0}),
-    Format = fun({Y,M,D}) -> lists:flatten(io_lib:format("~w~2..0w~2..0w000000Z",[Y,M,D])) end,
-    #'Validity'{notBefore={generalTime, Format(DefFrom)},
-		notAfter ={generalTime, Format(DefTo)}}.
-
-sign_algorithm(#'RSAPrivateKey'{}, Opts) ->
-    Type = case proplists:get_value(digest, Opts, sha1) of
-	       sha1 ->   ?'sha1WithRSAEncryption';
-	       sha512 -> ?'sha512WithRSAEncryption';
-	       sha384 -> ?'sha384WithRSAEncryption';
-	       sha256 -> ?'sha256WithRSAEncryption';
-	       md5    -> ?'md5WithRSAEncryption';
-	       md2    -> ?'md2WithRSAEncryption'
-	   end,
-    {Type, 'NULL'};
-sign_algorithm(#'DSAPrivateKey'{p=P, q=Q, g=G}, _Opts) ->
-    {?'id-dsa-with-sha1', {params,#'Dss-Parms'{p=P, q=Q, g=G}}}.
-
-make_key(rsa, _Opts) ->
-    %% (OBS: for testing only)
-    gen_rsa2(64);
-make_key(dsa, _Opts) ->
-    gen_dsa2(128, 20).  %% Bytes i.e. {1024, 160} 
-    
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-%% RSA key generation  (OBS: for testing only)
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
--define(SMALL_PRIMES, [65537,97,89,83,79,73,71,67,61,59,53,
-		       47,43,41,37,31,29,23,19,17,13,11,7,5,3]).
-
-gen_rsa2(Size) ->
-    P = prime(Size),
-    Q = prime(Size),
-    N = P*Q,
-    Tot = (P - 1) * (Q - 1),
-    [E|_] = lists:dropwhile(fun(Candidate) -> (Tot rem Candidate) == 0 end, ?SMALL_PRIMES),
-    {D1,D2} = extended_gcd(E, Tot),
-    D = erlang:max(D1,D2),
-    case D < E of
-	true ->
-	    gen_rsa2(Size);
-	false ->
-	    {Co1,Co2} = extended_gcd(Q, P),
-	    Co = erlang:max(Co1,Co2),
-	    #'RSAPrivateKey'{version = 'two-prime',
-			     modulus = N,
-			     publicExponent  = E,
-			     privateExponent = D, 
-			     prime1 = P, 
-			     prime2 = Q, 
-			     exponent1 = D rem (P-1), 
-			     exponent2 = D rem (Q-1), 
-			     coefficient = Co
-			    }
-    end.
-
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-%% DSA key generation  (OBS: for testing only)
-%% See http://en.wikipedia.org/wiki/Digital_Signature_Algorithm
-%% and the fips_186-3.pdf
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-gen_dsa2(LSize, NSize) ->
-    Q  = prime(NSize),  %% Choose N-bit prime Q
-    X0 = prime(LSize),
-    P0 = prime((LSize div 2) +1),
-    
-    %% Choose L-bit prime modulus P such that p-1 is a multiple of q.
-    case dsa_search(X0 div (2*Q*P0), P0, Q, 1000) of
-	error -> 
-	    gen_dsa2(LSize, NSize);
-	P ->	    
-	    G = crypto:mod_exp(2, (P-1) div Q, P), % Choose G a number whose multiplicative order modulo p is q.
-	    %%                 such that This may be done by setting g = h^(p-1)/q mod p, commonly h=2 is used.
-	    
-	    X = prime(20),               %% Choose x by some random method, where 0 < x < q.
-	    Y = crypto:mod_exp(G, X, P), %% Calculate y = g^x mod p.
-	    
-	    #'DSAPrivateKey'{version=0, p=P, q=Q, g=G, y=Y, x=X}
-    end.
-    
-%% See fips_186-3.pdf
-dsa_search(T, P0, Q, Iter) when Iter > 0 ->
-    P = 2*T*Q*P0 + 1,
-    case is_prime(crypto:mpint(P), 50) of
-	true -> P;
-	false -> dsa_search(T+1, P0, Q, Iter-1)
-    end;
-dsa_search(_,_,_,_) -> 
-    error.
-
-
-%%%%%%% Crypto Math %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-prime(ByteSize) ->
-    Rand = odd_rand(ByteSize),
-    crypto:erlint(prime_odd(Rand, 0)).
-
-prime_odd(Rand, N) ->
-    case is_prime(Rand, 50) of
-	true -> 
-	    Rand;
-	false -> 
-	    NotPrime = crypto:erlint(Rand),
-	    prime_odd(crypto:mpint(NotPrime+2), N+1)
-    end.
-
-%% see http://en.wikipedia.org/wiki/Fermat_primality_test
-is_prime(_, 0) -> true;
-is_prime(Candidate, Test) -> 
-    CoPrime = odd_rand(<<0,0,0,4, 10000:32>>, Candidate),
-    case crypto:mod_exp(CoPrime, Candidate, Candidate) of
-	CoPrime -> is_prime(Candidate, Test-1);
-	_       -> false
-    end.
-
-odd_rand(Size) ->
-    Min = 1 bsl (Size*8-1),
-    Max = (1 bsl (Size*8))-1,
-    odd_rand(crypto:mpint(Min), crypto:mpint(Max)).
-
-odd_rand(Min,Max) ->
-    Rand = <<Sz:32, _/binary>> = crypto:rand_uniform(Min,Max),
-    BitSkip = (Sz+4)*8-1,
-    case Rand of
-	Odd  = <<_:BitSkip,  1:1>> -> Odd;
-	Even = <<_:BitSkip,  0:1>> -> 
-	    crypto:mpint(crypto:erlint(Even)+1)
-    end.
-
-extended_gcd(A, B) ->
-    case A rem B of
-	0 ->
-	    {0, 1};
-	N ->
-	    {X, Y} = extended_gcd(B, N),
-	    {Y, X-Y*(A div B)}
-    end.
-
-pem_to_der(File) ->
-    {ok, PemBin} = file:read_file(File),
-    public_key:pem_decode(PemBin).
+    KHFile = filename:join(UserDir, "known_hosts"),
+    file:write_file(KHFile, KnownHostsEnc).
 
-der_to_pem(File, Entries) ->
-    PemBin = public_key:pem_encode(Entries),
-    file:write_file(File, PemBin).
+clean_dsa(UserDir) ->
+    file:delete(filename:join(UserDir,  "ssh_host_dsa_key")),
+    file:delete(filename:join(UserDir,  "ssh_host_dsa_key.pub")),
+    file:delete(filename:join(UserDir,  "known_hosts")).