inets: Fix better test case data generation

Inets generated test data that not conform to valid TLS cipher suites

3 files changed, 208 insertions, 41 deletions

diff --git a/lib/inets/test/httpc_SUITE.erl b/lib/inets/test/httpc_SUITE.erl
index 47c7ffd190..84d07bc97f 100644
--- a/lib/inets/test/httpc_SUITE.erl
+++ b/lib/inets/test/httpc_SUITE.erl
@@ -239,9 +239,36 @@ end_per_group(_, _Config) ->
     ok.
 
 do_init_per_group(Group, Config0) ->
-    Config = proplists:delete(port, Config0),
+    Config1 =
+        case Group of
+            https ->
+                init_ssl(Config0);
+            sim_https ->
+                init_ssl(Config0);
+            _ ->
+                Config0
+        end,
+    Config = proplists:delete(port, Config1),
     Port = server_start(Group, server_config(Group, Config)),
     [{port, Port} | Config].
+
+init_ssl(Config) ->
+    ClientFileBase = filename:join([proplists:get_value(priv_dir, Config), "client"]),
+    ServerFileBase = filename:join([proplists:get_value(priv_dir, Config), "server"]),
+    GenCertData =
+        public_key:pkix_test_data(#{server_chain => 
+                                        #{root => [{key, inets_test_lib:hardcode_rsa_key(1)}],
+                                          intermediates => [[{key, inets_test_lib:hardcode_rsa_key(2)}]],
+                                          peer => [{key, inets_test_lib:hardcode_rsa_key(3)}
+                                                  ]},
+                                    client_chain => 
+                                        #{root => [{key, inets_test_lib:hardcode_rsa_key(4)}],
+                                          intermediates => [[{key, inets_test_lib:hardcode_rsa_key(5)}]],
+                                          peer => [{key, inets_test_lib:hardcode_rsa_key(6)}]}}),
+
+    Conf = inets_test_lib:gen_pem_config_files(GenCertData, ClientFileBase, ServerFileBase),
+    [{ssl_conf, Conf} | Config].
+
 %%--------------------------------------------------------------------
 init_per_testcase(pipeline, Config) ->
     inets:start(httpc, [{profile, pipeline}]),
@@ -1622,10 +1649,8 @@ start_apps(_) ->
     ok.
 
 ssl_config(Config) ->
-    DataDir = proplists:get_value(data_dir, Config),
-    [{certfile, filename:join(DataDir, "ssl_server_cert.pem")},
-     {verify, verify_none}
-    ].
+    SSLConf = proplists:get_value(ssl_conf, Config),
+    proplists:get_value(server_config, SSLConf).
 
 setup_server_dirs(ServerRoot, DocRoot, DataDir) ->   
     CgiDir =  filename:join(ServerRoot, "cgi-bin"),
diff --git a/lib/inets/test/httpd_SUITE.erl b/lib/inets/test/httpd_SUITE.erl
index 5020b5a802..251547dcb0 100644
--- a/lib/inets/test/httpd_SUITE.erl
+++ b/lib/inets/test/httpd_SUITE.erl
@@ -1819,32 +1819,23 @@ server_start(_, HttpdConfig) ->
     {Pid, proplists:get_value(port, Info)}.
 
 init_ssl(Group, Config) ->
-    PrivDir = proplists:get_value(priv_dir, Config),
-    CaKey = {_Trusted,_} = 
-	erl_make_certs:make_cert([{key, dsa},
-				  {subject, 
-				   [{name, "Public Key"},
-				    {?'id-at-name', 
-				     {printableString, "public_key"}},
-				    {?'id-at-pseudonym', 
-				     {printableString, "pubkey"}},
-				    {city, "Stockholm"},
-				    {country, "SE"},
-				    {org, "erlang"},
-				    {org_unit, "testing dep"}
-				   ]}
-				 ]),
-    ok = erl_make_certs:write_pem(PrivDir, "public_key_cacert", CaKey),
-    
-    CertK1 = {_Cert1, _} = erl_make_certs:make_cert([{issuer, CaKey}]),
-    CertK2 = {_Cert2,_} = erl_make_certs:make_cert([{issuer, CertK1}, 
-						   {digest, md5}, 
-						   {extensions, false}]),
-    ok = erl_make_certs:write_pem(PrivDir, "public_key_cert", CertK2),
-
+    ClientFileBase = filename:join([proplists:get_value(priv_dir, Config), "client"]),
+    ServerFileBase = filename:join([proplists:get_value(priv_dir, Config), "server"]),
+    GenCertData =
+        public_key:pkix_test_data(#{server_chain => 
+                                        #{root => [{key, inets_test_lib:hardcode_rsa_key(1)}],
+                                          intermediates => [[{key, inets_test_lib:hardcode_rsa_key(2)}]],
+                                          peer => [{key, inets_test_lib:hardcode_rsa_key(3)}
+                                                  ]},
+                                    client_chain => 
+                                        #{root => [{key, inets_test_lib:hardcode_rsa_key(4)}],
+                                          intermediates => [[{key, inets_test_lib:hardcode_rsa_key(5)}]],
+                                          peer => [{key, inets_test_lib:hardcode_rsa_key(6)}]}}),
+
+    Conf = inets_test_lib:gen_pem_config_files(GenCertData, ClientFileBase, ServerFileBase),                               
     case start_apps(Group) of
 	ok ->
-	    init_httpd(Group, [{type, ssl} | Config]);
+	    init_httpd(Group, [{type, ssl}, {ssl_conf, Conf} | Config]);
 	_ ->
 	    {skip, "Could not start https apps"}
     end.
@@ -1956,16 +1947,11 @@ server_config(http_rel_path_script_alias, Config) ->
      {eval_script_alias, {"/eval", [httpd_example, io]}}
     ];
 server_config(https, Config) ->
-    PrivDir = proplists:get_value(priv_dir, Config),
+    SSLConf = proplists:get_value(ssl_conf, Config),
+    ServerConf = proplists:get_value(server_config, SSLConf),
     [{socket_type, {essl,
-		    [{nodelay, true},
-		     {cacertfile, 
-		      filename:join(PrivDir, "public_key_cacert.pem")},
-		     {certfile, 
-		      filename:join(PrivDir, "public_key_cert.pem")},
-		     {keyfile,
-		      filename:join(PrivDir, "public_key_cert_key.pem")}
-		    ]}}] ++ proplists:delete(socket_type, server_config(http, Config)).
+		    [{nodelay, true} | ServerConf]}}]
+        ++ proplists:delete(socket_type, server_config(http, Config)).
 
 init_httpd(Group, Config0) ->
     Config1 = proplists:delete(port, Config0),
@@ -2220,9 +2206,9 @@ cleanup_mnesia() ->
     ok.
 
 transport_opts(ssl, Config) ->
-    PrivDir = proplists:get_value(priv_dir, Config),
-    [proplists:get_value(ipfamily, Config),
-     {cacertfile, filename:join(PrivDir, "public_key_cacert.pem")}];
+    SSLConf = proplists:get_value(ssl_conf, Config),
+    ClientConf = proplists:get_value(client_config, SSLConf),
+    [proplists:get_value(ipfamily, Config) | ClientConf];
 transport_opts(_, Config) ->
     [proplists:get_value(ipfamily, Config)].
 
diff --git a/lib/inets/test/inets_test_lib.erl b/lib/inets/test/inets_test_lib.erl
index 2529cc5f9b..d1f238ba0e 100644
--- a/lib/inets/test/inets_test_lib.erl
+++ b/lib/inets/test/inets_test_lib.erl
@@ -22,6 +22,7 @@
 
 -include("inets_test_lib.hrl").
 -include_lib("inets/src/http_lib/http_internal.hrl").
+-include_lib("public_key/include/public_key.hrl").
 
 %% Note: This directive should only be used in test suites.
 -compile(export_all).
@@ -594,3 +595,158 @@ read_junk(OpensslPort) ->
     after 500 -> 
 	    ok    
     end.
+hardcode_rsa_key(1) ->
+    #'RSAPrivateKey'{
+       version = 'two-prime',
+       modulus = 23995666614853919027835084074500048897452890537492185072956789802729257783422306095699263934587064480357348855732149402060270996295002843755712064937715826848741191927820899197493902093529581182351132392364214171173881547273475904587683433713767834856230531387991145055273426806331200574039205571401702219159773947658558490957010003143162250693492642996408861265758000254664396313741422909188635443907373976005987612936763564996605457102336549804831742940035613780926178523017685712710473543251580072875247250504243621640157403744718833162626193206685233710319205099867303242759099560438381385658382486042995679707669,
+       publicExponent = 17,
+       privateExponent = 11292078406990079542510627799764728892919007311761028269626724613049062486316379339152594792746853873109340637991599718616598115903530750002688030558925094987642913848386305504703012749896273497577003478759630198199473669305165131570674557041773098755873191241407597673069847908861741446606684974777271632545629600685952292605647052193819136445675100211504432575554351515262198132231537860917084269870590492135731720141577986787033006338680118008484613510063003323516659048210893001173583018220214626635609151105287049126443102976056146630518124476470236027123782297108342869049542023328584384300970694412006494684657,
+       prime1 = 169371138592582642967021557955633494538845517070305333860805485424261447791289944610138334410987654265476540480228705481960508520379619587635662291973699651583489223555422528867090299996446070521801757353675026048850480903160224210802452555900007597342687137394192939372218903554801584969667104937092080815197,
+       prime2 = 141675062317286527042995673340952251894209529891636708844197799307963834958115010129693036021381525952081167155681637592199810112261679449166276939178032066869788822014115556349519329537177920752776047051833616197615329017439297361972726138285974555338480581117881706656603857310337984049152655480389797687577,
+       exponent1 = 119556097830058336212015217380447172615655659108450823901745048534772786676204666783627059584226579481512852103690850928442711896738555003036938088452023283470698275450886490965004917644550167427154181661417665446247398284583687678213495921811770068712485038160606780733330990744565824684470897602653233516609,
+       exponent2 = 41669135975672507953822256864985956439473391144599032012999352737636422046504414744027363535700448809435637398729893409470532385959317485048904982111185902020526124121798693043976273393287623750816484427009887116945685005129205106462566511260580751570141347387612266663707016855981760014456663376585234613993,
+       coefficient = 76837684977089699359024365285678488693966186052769523357232308621548155587515525857011429902602352279058920284048929101483304120686557782043616693940283344235057989514310975192908256494992960578961614059245280827077951132083993754797053182279229469590276271658395444955906108899267024101096069475145863928441,
+       otherPrimeInfos = asn1_NOVALUE};
+
+hardcode_rsa_key(2) ->
+    #'RSAPrivateKey'{
+       version = 'two-prime',
+       modulus = 21343679768589700771839799834197557895311746244621307033143551583788179817796325695589283169969489517156931770973490560582341832744966317712674900833543896521418422508485833901274928542544381247956820115082240721897193055368570146764204557110415281995205343662628196075590438954399631753508888358737971039058298703003743872818150364935790613286541190842600031570570099801682794056444451081563070538409720109449780410837763602317050353477918147758267825417201591905091231778937606362076129350476690460157227101296599527319242747999737801698427160817755293383890373574621116766934110792127739174475029121017282777887777,
+       publicExponent = 17,
+       privateExponent = 18832658619343853622211588088997845201745658451136447382185486691577805721584993260814073385267196632785528033211903435807948675951440868570007265441362261636545666919252206383477878125774454042314841278013741813438699754736973658909592256273895837054592950290554290654932740253882028017801960316533503857992358685308186680144968293076156011747178275038098868263178095174694099811498968993700538293188879611375604635940554394589807673542938082281934965292051746326331046224291377703201248790910007232374006151098976879987912446997911775904329728563222485791845480864283470332826504617837402078265424772379987120023773,
+       prime1 = 146807662748886761089048448970170315054939768171908279335181627815919052012991509112344782731265837727551849787333310044397991034789843793140419387740928103541736452627413492093463231242466386868459637115999163097726153692593711599245170083315894262154838974616739452594203727376460632750934355508361223110419,
+       prime2 = 145385325050081892763917667176962991350872697916072592966410309213561884732628046256782356731057378829876640317801978404203665761131810712267778698468684631707642938779964806354584156202882543264893826268426566901882487709510744074274965029453915224310656287149777603803201831202222853023280023478269485417083,
+       exponent1 = 51814469205489445090252393754177758254684624060673510353593515699736136004585238510239335081623236845018299924941168250963996835808180162284853901555621683602965806809675350150634081614988136541809283687999704622726877773856604093851236499993845033701707873394143336209718962603456693912094478414715725803677,
+       exponent2 = 51312467664734785681382706062457526359131540440966797517556579722433606376221663384746714140373192528191755406283051201483646739222992016094510128871300458249756331334105225772206172777487956446433115153562317730076172132768497908567634716277852432109643395464627389577600646306666889302334125933506877206029,
+       coefficient = 30504662229874176232343608562807118278893368758027179776313787938167236952567905398252901545019583024374163153775359371298239336609182249464886717948407152570850677549297935773605431024166978281486607154204888016179709037883348099374995148481968169438302456074511782717758301581202874062062542434218011141540,
+       otherPrimeInfos = asn1_NOVALUE};
+hardcode_rsa_key(3) -> 
+    #'RSAPrivateKey'{ 
+       version = 'two-prime',
+       modulus = 25089040456112869869472694987833070928503703615633809313972554887193090845137746668197820419383804666271752525807484521370419854590682661809972833718476098189250708650325307850184923546875260207894844301992963978994451844985784504212035958130279304082438876764367292331581532569155681984449177635856426023931875082020262146075451989132180409962870105455517050416234175675478291534563995772675388370042873175344937421148321291640477650173765084699931690748536036544188863178325887393475703801759010864779559318631816411493486934507417755306337476945299570726975433250753415110141783026008347194577506976486290259135429,
+       publicExponent = 17,
+       privateExponent = 8854955455098659953931539407470495621824836570223697404931489960185796768872145882893348383311931058684147950284994536954265831032005645344696294253579799360912014817761873358888796545955974191021709753644575521998041827642041589721895044045980930852625485916835514940558187965584358347452650930302268008446431977397918214293502821599497633970075862760001650736520566952260001423171553461362588848929781360590057040212831994258783694027013289053834376791974167294527043946669963760259975273650548116897900664646809242902841107022557239712438496384819445301703021164043324282687280801738470244471443835900160721870265,
+       prime1 = 171641816401041100605063917111691927706183918906535463031548413586331728772311589438043965564336865070070922328258143588739626712299625805650832695450270566547004154065267940032684307994238248203186986569945677705100224518137694769557564475390859269797990555863306972197736879644001860925483629009305104925823,
+       prime2 =146170909759497809922264016492088453282310383272504533061020897155289106805616042710009332510822455269704884883705830985184223718261139908416790475825625309815234508695722132706422885088219618698987115562577878897003573425367881351537506046253616435685549396767356003663417208105346307649599145759863108910523,
+       exponent1 = 60579464612132153154728441333538327425711971378777222246428851853999433684345266860486105493295364142377972586444050678378691780811632637288529186629507258781295583787741625893888579292084087601124818789392592131211843947578009918667375697196773859928702549128225990187436545756706539150170692591519448797349,
+       exponent2 = 137572620950115585809189662580789132500998007785886619351549079675566218169991569609420548245479957900898715184664311515467504676010484619686391036071176762179044243478326713135456833024206699951987873470661533079532774988581535389682358631768109586527575902839864474036157372334443583670210960715165278974609,
+       coefficient = 15068630434698373319269196003209754243798959461311186548759287649485250508074064775263867418602372588394608558985183294561315208336731894947137343239541687540387209051236354318837334154993136528453613256169847839789803932725339395739618592522865156272771578671216082079933457043120923342632744996962853951612,
+       otherPrimeInfos = asn1_NOVALUE};
+hardcode_rsa_key(4) -> 
+    #'RSAPrivateKey'{
+       version ='two-prime',
+       modulus = 28617237755030755643854803617273584643843067580642149032833640135949799721163782522787597288521902619948688786051081993247908700824196122780349730169173433743054172191054872553484065655968335396052034378669869864779940355219732200954630251223541048434478476115391643898092650304645086338265930608997389611376417609043761464100338332976874588396803891301015812818307951159858145399281035705713082131199940309445719678087542976246147777388465712394062188801177717719764254900022006288880246925156931391594131839991579403409541227225173269459173129377291869028712271737734702830877034334838181789916127814298794576266389,
+       publicExponent = 17,
+       privateExponent = 26933870828264240605980991639786903194205240075898493207372837775011576208154148256741268036255908348187001210401018346586267012540419880263858569570986761169933338532757527109161473558558433313931326474042230460969355628442100895016122589386862163232450330461545076609969553227901257730132640573174013751883368376011370428995523268034111482031427024082719896108094847702954695363285832195666458915142143884210891427766607838346722974883433132513540317964796373298134261669479023445911856492129270184781873446960437310543998533283339488055776892320162032014809906169940882070478200435536171854883284366514852906334641,
+       prime1 = 177342190816702392178883147766999616783253285436834252111702533617098994535049411784501174309695427674025956656849179054202187436663487378682303508229883753383891163725167367039879190685255046547908384208614573353917213168937832054054779266431207529839577747601879940934691505396807977946728204814969824442867,
+       prime2 = 161367340863680900415977542864139121629424927689088951345472941851682581254789586032968359551717004797621579428672968948552429138154521719743297455351687337112710712475376510559020211584326773715482918387500187602625572442687231345855402020688502483137168684570635690059254866684191216155909970061793538842967,
+       exponent1 = 62591361464718491357252875682470452982324688977706206627659717747211409835899792394529826226951327414362102349476180842659595565881230839534930649963488383547255704844176717778780890830090016428673547367746320007264898765507470136725216211681602657590439205035957626212244060728285168687080542875871702744541,
+       exponent2 = 28476589564178982426348978152495139111074987239250991413906989738532220221433456358759122273832412611344984605059935696803369847909621479954699550944415412431654831613301737157474154985469430655673456186029444871051571607533040825739188591886206320553618003159523945304574388238386685203984112363845918619347,
+       coefficient = 34340318160575773065401929915821192439103777558577109939078671096408836197675640654693301707202885840826672396546056002756167635035389371579540325327619480512374920136684787633921441576901246290213545161954865184290700344352088099063404416346968182170720521708773285279884132629954461545103181082503707725012,
+       otherPrimeInfos = asn1_NOVALUE};
+
+hardcode_rsa_key(5) -> 
+    #'RSAPrivateKey'{ 
+       version= 'two-prime',
+       modulus = 26363170152814518327068346871197765236382539835597898797762992537312221863402655353436079974302838986536256364057947538018476963115004626096654613827403121905035011992899481598437933532388248462251770039307078647864188314916665766359828262009578648593031111569685489178543405615478739906285223620987558499488359880003693226535420421293716164794046859453204135383236667988765227190694994861629971618548127529849059769249520775574008363789050621665120207265361610436965088511042779948238320901918522125988916609088415989475825860046571847719492980547438560049874493788767083330042728150253120940100665370844282489982633,
+       publicExponent = 17,
+       privateExponent = 10855423004100095781734025182257903332628104638187370093196526338893267826106975733767797636477639582691399679317978398007608161282648963686857782164224814902073240232370374775827384395689278778574258251479385325591136364965685903795223402003944149420659869469870495544106108194608892902588033255700759382142132115013969680562678811046675523365751498355532768935784747314021422035957153013494814430893022253205880275287307995039363642554998244274484818208792520243113824379110193356010059999642946040953102866271737127640405568982049887176990990501963784502429481034227543991366980671390566584211881030995602076468001,
+       prime1 =163564135568104310461344551909369650951960301778977149705601170951529791054750122905880591964737953456660497440730575925978769763154927541340839715938951226089095007207042122512586007411328664679011914120351043948122025612160733403945093961374276707993674792189646478659304624413958625254578122842556295400709,
+       prime2 = 161179405627326572739107057023381254841260287988433675196680483761672455172873134522398837271764104320975746111042211695289319249471386600030523328069395763313848583139553961129874895374324504709512019736703349829576024049432816885712623938437949550266365056310544300920756181033500610331519029869549723159637,
+       exponent1 = 115457036871603042678596154288966812436677860079277988027483179495197499568058910286503947269226790675289762899339230065396778656344654735064122152427494983121714122734382674714766593466820233891067233496718383963380253373289929461608301619793607087995535147427985749641862087821617853120878674947686796753441,
+       exponent2 = 142217122612346975946270932667689342506994371754500301644129838613240401623123353990351915239791856753802128921507833848784693455415929352968108818884760967629866396887841730408713142977345151214275311532385308673155315337734838428569962298621720191411498579097539089047726042088382891468987379296661520434973,
+       coefficient = 40624877259097915043489529504071755460170951428490878553842519165800720914888257733191322215286203357356050737713125202129282154441426952501134581314792133018830748896123382106683994268028624341502298766844710276939303555637478596035491641473828661569958212421472263269629366559343208764012473880251174832392,
+       otherPrimeInfos = asn1_NOVALUE};
+hardcode_rsa_key(6) -> 
+    #'RSAPrivateKey'{ 
+       version = 'two-prime',
+       modulus = 22748888494866396715768692484866595111939200209856056370972713870125588774286266397044592487895293134537316190976192161177144143633669641697309689280475257429554879273045671863645233402796222694405634510241820106743648116753479926387434021380537483429927516962909367257212902212159798399531316965145618774905828756510318897899298783143203190245236381440043169622358239226123652592179006905016804587837199618842875361941208299410035232803124113612082221121192550063791073372276763648926636149384299189072950588522522800393261949880796214514243704858378436010975184294077063518776479282353562934591448646412389762167039,
+       publicExponent = 17,
+       privateExponent = 6690849557313646092873144848490175032923294179369428344403739373566349639495960705013115437616262686628622409110644753287395336362844012263914614494257428655751435080307550548130951000822418439531068973600535325512837681398082331290421770994275730420566916753796872722709677121223470117509210872101652580854566448661533030419787125312956120661097410038933324613372774190658239039998357548275441758790939430824924502690997433186652165055694361752689819209062683281242276039100201318203707142383491769671330743466041394101421674581185260900666085723130684175548215193875544802254923825103844262661010117443222587769713,
+       prime1 = 164748737139489923768181260808494855987398781964531448608652166632780898215212977127034263859971474195908846263894581556691971503119888726148555271179103885786024920582830105413607436718060544856016793981261118694063993837665813285582095833772675610567592660039821387740255651489996976698808018635344299728063,
+       prime2 = 138082323967104548254375818343885141517788525705334488282154811252858957969378263753268344088034079842223206527922445018725900110643394926788280539200323021781309918753249061620424428562366627334409266756720941754364262467100514166396917565961434203543659974860389803369482625510495464845206228470088664021953,
+       exponent1 = 19382204369351755737433089506881747763223386113474288071606137250915399790025056132592266336467232258342217207517009594904937823896457497193947678962247515974826461245038835931012639613889475865413740468383661022831058098548919210068481862796785365949128548239978986792971253116470232552800943368864035262125,
+       exponent2 = 48734937870742781736838524121371226418043009072470995864289933383361985165662916618800592031070851709019955245149098241903258862580021738866451955011878713569874088971734962924855680669070574353320917678842685325069739694270769705787147376221682660074232932303666989424523279591939575827719845342384234360689,
+       coefficient = 81173034184183681160439870161505779100040258708276674532866007896310418779840630960490793104541748007902477778658270784073595697910785917474138815202903114440800310078464142273778315781957021015333260021813037604142367434117205299831740956310682461174553260184078272196958146289378701001596552915990080834227,
+       otherPrimeInfos = asn1_NOVALUE}.
+
+gen_pem_config_files(#{server_config := ServerConf,
+                       client_config := ClientConf}, ClientBase, ServerBase) ->
+    
+    ServerCaCertFile = ServerBase ++ "_server_cacerts.pem",
+    ServerCertFile = ServerBase ++ "_server_cert.pem",
+    ServerKeyFile = ServerBase ++ "_server_key.pem",
+    
+    ClientCaCertFile = ClientBase ++ "_client_cacerts.pem",
+    ClientCertFile =  ClientBase ++ "_client_cert.pem",
+    ClientKeyFile = ClientBase ++ "_client_key.pem",
+
+    do_gen_pem_config_files(ServerConf,
+                            ServerCertFile,
+                            ServerKeyFile,
+                            ServerCaCertFile),        
+    do_gen_pem_config_files(ClientConf,
+                            ClientCertFile,
+                            ClientKeyFile,
+                            ClientCaCertFile),
+    [{server_config, [{certfile, ServerCertFile}, 
+                      {keyfile, ServerKeyFile}, {cacertfile, ServerCaCertFile}]}, 
+     {client_config, [{certfile, ClientCertFile}, 
+                      {keyfile, ClientKeyFile}, {cacertfile, ClientCaCertFile}]}].
+extensions(Exts) ->
+    [extension(Ext) || Ext <- Exts].
+
+
+do_gen_pem_config_files(Config, CertFile, KeyFile, CAFile) ->
+    CAs = proplists:get_value(cacerts, Config),
+    Cert = proplists:get_value(cert, Config),
+    Key = proplists:get_value(key, Config),
+    der_to_pem(CertFile, [cert_entry(Cert)]),
+    der_to_pem(KeyFile, [key_entry(Key)]),
+    der_to_pem(CAFile, ca_entries(CAs)).
+
+cert_entry(Cert) ->
+    {'Certificate', Cert, not_encrypted}.
+
+key_entry({'RSAPrivateKey', DERKey}) ->
+    {'RSAPrivateKey', DERKey, not_encrypted};
+key_entry({'DSAPrivateKey', DERKey}) ->
+    {'DSAPrivateKey', DERKey, not_encrypted};
+key_entry({'ECPrivateKey', DERKey}) ->
+    {'ECPrivateKey', DERKey, not_encrypted}.
+
+ca_entries(CAs) ->
+    [{'Certificate', CACert, not_encrypted} || CACert <- CAs].
+
+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({key_usage, Value}) ->
+    #'Extension'{extnID = ?'id-ce-keyUsage',
+                 extnValue = Value,
+                 critical = false};
+extension({subject_alt, Hostname}) ->
+    #'Extension'{extnID = ?'id-ce-subjectAltName',
+                 extnValue = [{dNSName, Hostname}],
+                 critical = false};
+extension({Id, Data, Critical}) ->
+    #'Extension'{extnID = Id, extnValue = Data, critical = Critical}.
+
+der_to_pem(File, Entries) ->
+    PemBin = public_key:pem_encode(Entries),
+    file:write_file(File, PemBin).