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-%%
-%% %CopyrightBegin%
-%%
-%% Copyright Ericsson AB 2010. 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%
-%%
-
-%% Create test certificates
-
--module(pkey_test).
--include_lib("public_key/include/public_key.hrl").
-
--export([make_cert/1, gen_rsa/1, verify_signature/3, write_pem/3]).
--compile(export_all).
-
-%%--------------------------------------------------------------------
-%% @doc 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)
-%% @spec ([{::atom(), ::term()}]) -> {Cert::binary(), Key::binary()}
-%% @end
-%%--------------------------------------------------------------------
-
-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)}.
-
-%%--------------------------------------------------------------------
-%% @doc Writes pem files in Dir with FileName ++ ".pem" and FileName ++ "_key.pem"
-%% @spec (::string(), ::string(), {Cert,Key}) -> ok
-%% @end
-%%--------------------------------------------------------------------
-write_pem(Dir, FileName, {Cert, Key = {_,_,not_encrypted}}) when is_binary(Cert) ->
- ok = der_to_pem(filename:join(Dir, FileName ++ ".pem"),
- [{'Certificate', Cert, not_encrypted}]),
- ok = der_to_pem(filename:join(Dir, FileName ++ "_key.pem"), [Key]).
-
-%%--------------------------------------------------------------------
-%% @doc Creates a rsa key (OBS: for testing only)
-%% the size are in bytes
-%% @spec (::integer()) -> {::atom(), ::binary(), ::opaque()}
-%% @end
-%%--------------------------------------------------------------------
-gen_rsa(Size) when is_integer(Size) ->
- Key = gen_rsa2(Size),
- {Key, encode_key(Key)}.
-
-%%--------------------------------------------------------------------
-%% @doc Creates a dsa key (OBS: for testing only)
-%% the sizes are in bytes
-%% @spec (::integer()) -> {::atom(), ::binary(), ::opaque()}
-%% @end
-%%--------------------------------------------------------------------
-gen_dsa(LSize,NSize) when is_integer(LSize), is_integer(NSize) ->
- Key = gen_dsa2(LSize, NSize),
- {Key, encode_key(Key)}.
-
-%%--------------------------------------------------------------------
-%% @doc Verifies cert signatures
-%% @spec (::binary(), ::tuple()) -> ::boolean()
-%% @end
-%%--------------------------------------------------------------------
-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, _}|_]} = public_key: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=#'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', #'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).
-
-der_to_pem(File, Entries) ->
- PemBin = public_key:pem_encode(Entries),
- file:write_file(File, PemBin).