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-rw-r--r--lib/public_key/src/pubkey_pem.erl250
1 files changed, 151 insertions, 99 deletions
diff --git a/lib/public_key/src/pubkey_pem.erl b/lib/public_key/src/pubkey_pem.erl
index 65879f1bbe..31d881973a 100644
--- a/lib/public_key/src/pubkey_pem.erl
+++ b/lib/public_key/src/pubkey_pem.erl
@@ -40,7 +40,10 @@
-module(pubkey_pem).
--export([read_file/1, read_file/2, write_file/2, decode/2]).
+-include("public_key.hrl").
+
+-export([encode/1, decode/1, decipher/2, cipher/3]).
+%% Backwards compatibility
-export([decode_key/2]).
-define(ENCODED_LINE_LENGTH, 64).
@@ -48,28 +51,82 @@
%%====================================================================
%% Internal application API
%%====================================================================
-read_file(File) ->
- read_file(File, no_passwd).
-read_file(File, Passwd) ->
- {ok, Bin} = file:read_file(File),
- decode(Bin, Passwd).
+%%--------------------------------------------------------------------
+-spec decode(binary()) -> [pem_entry()].
+%%
+%% Description: Decodes a PEM binary.
+%%--------------------------------------------------------------------
+decode(Bin) ->
+ decode_pem_entries(split_bin(Bin), []).
-write_file(File, Ds) ->
- file:write_file(File, encode_file(Ds)).
+%%--------------------------------------------------------------------
+-spec encode([pem_entry()]) -> iolist().
+%%
+%% Description: Encodes a list of PEM entries.
+%%--------------------------------------------------------------------
+encode(PemEntries) ->
+ encode_pem_entries(PemEntries).
-decode_key({_Type, Bin, not_encrypted}, _) ->
- Bin;
-decode_key({_Type, Bin, {Chipher,Salt}}, Password) ->
- decode_key(Bin, Password, Chipher, Salt).
+%%--------------------------------------------------------------------
+-spec decipher({pki_asn1_type(), decrypt_der(),{Cipher :: string(), Salt :: binary()}}, string()) ->
+ der_encoded().
+%%
+%% Description: Deciphers a decrypted pem entry.
+%%--------------------------------------------------------------------
+decipher({_, DecryptDer, {Cipher,Salt}}, Password) ->
+ decode_key(DecryptDer, Password, Cipher, Salt).
-decode(Bin, Passwd) ->
- decode_file(split_bin(Bin), Passwd).
+%%--------------------------------------------------------------------
+-spec cipher(der_encoded(),{Cipher :: string(), Salt :: binary()} , string()) -> binary().
+%%
+%% Description: Ciphers a PEM entry
+%%--------------------------------------------------------------------
+cipher(Der, {Cipher,Salt}, Password)->
+ encode_key(Der, Password, Cipher, Salt).
%%--------------------------------------------------------------------
%%% Internal functions
%%--------------------------------------------------------------------
+encode_pem_entries(Entries) ->
+ [encode_pem_entry(Entry) || Entry <- Entries].
+
+encode_pem_entry({Asn1Type, Der, not_encrypted}) ->
+ StartStr = pem_start(Asn1Type),
+ [StartStr, "\n", b64encode_and_split(Der), pem_end(StartStr) ,"\n\n"];
+encode_pem_entry({Asn1Type, Der, {Cipher, Salt}}) ->
+ StartStr = pem_start(Asn1Type),
+ [StartStr,"\n", pem_decrypt(),"\n", pem_decrypt_info(Cipher, Salt),"\n",
+ b64encode_and_split(Der), pem_end(StartStr) ,"\n\n"].
+
+decode_pem_entries([], Entries) ->
+ lists:reverse(Entries);
+decode_pem_entries([<<>>], Entries) ->
+ lists:reverse(Entries);
+decode_pem_entries([<<>> | Lines], Entries) ->
+ decode_pem_entries(Lines, Entries);
+decode_pem_entries([Start| Lines], Entries) ->
+ case pem_end(Start) of
+ undefined ->
+ decode_pem_entries(Lines, Entries);
+ _End ->
+ {Entry, RestLines} = join_entry(Lines, []),
+ decode_pem_entries(RestLines, [decode_pem_entry(Start, Entry) | Entries])
+ end.
+decode_pem_entry(Start, [<<"Proc-Type: 4,ENCRYPTED", _/binary>>, Line | Lines]) ->
+ Asn1Type = asn1_type(Start),
+ Cs = erlang:iolist_to_binary(Lines),
+ Decoded = base64:mime_decode(Cs),
+ [_, DekInfo0] = string:tokens(binary_to_list(Line), ": "),
+ [Cipher, Salt] = string:tokens(DekInfo0, ","),
+ {Asn1Type, Decoded, {Cipher, unhex(Salt)}};
+decode_pem_entry(Start, Lines) ->
+ Asn1Type = asn1_type(Start),
+ Cs = erlang:iolist_to_binary(Lines),
+ Der = base64:mime_decode(Cs),
+ {Asn1Type, Der, not_encrypted}.
+
split_bin(Bin) ->
split_bin(0, Bin).
@@ -85,88 +142,26 @@ split_bin(N, Bin) ->
split_bin(N+1, Bin)
end.
-decode_file(Bin, Passwd) ->
- decode_file(Bin, [], [Passwd]).
-
-decode_file([<<"-----BEGIN CERTIFICATE REQUEST-----", _/binary>>|Rest], Ens, Info) ->
- decode_file2(Rest, [], Ens, cert_req, Info);
-decode_file([<<"-----BEGIN CERTIFICATE-----", _/binary>>|Rest], Ens, Info) ->
- decode_file2(Rest, [], Ens, cert, Info);
-decode_file([<<"-----BEGIN RSA PRIVATE KEY-----", _/binary>>|Rest], Ens, Info) ->
- decode_file2(Rest, [], Ens, rsa_private_key, Info);
-decode_file([<<"-----BEGIN DSA PRIVATE KEY-----", _/binary>>|Rest], Ens, Info) ->
- decode_file2(Rest, [], Ens, dsa_private_key, Info);
-decode_file([<<"-----BEGIN DH PARAMETERS-----", _/binary>>|Rest], Ens, Info) ->
- decode_file2(Rest, [], Ens, dh_params, Info);
-decode_file([_|Rest], Ens, Info) ->
- decode_file(Rest, Ens, Info);
-decode_file([], Ens, _Info) ->
- {ok, lists:reverse(Ens)}.
-
-decode_file2([<<"Proc-Type: 4,ENCRYPTED", _/binary>>| Rest0], RLs, Ens, Tag, Info0) ->
- [InfoLine|Rest] = Rest0,
- Info = dek_info(InfoLine, Info0),
- decode_file2(Rest, RLs, Ens, Tag, Info);
-decode_file2([<<"-----END", _/binary>>| Rest], RLs, Ens, Tag, Info0) ->
- Cs = erlang:iolist_to_binary(lists:reverse(RLs)),
- Bin = base64:mime_decode(Cs),
- case Info0 of
- [Password, Cipher, SaltHex | Info1] ->
- Salt = unhex(SaltHex),
- Enc = {Cipher, Salt},
- Decoded = decode_key(Bin, Password, Cipher, Salt),
- decode_file(Rest, [{Tag, Decoded, Enc}| Ens], Info1);
- _ ->
- decode_file(Rest, [{Tag, Bin, not_encrypted}| Ens], Info0)
- end;
-decode_file2([L|Rest], RLs, Ens, Tag, Info0) ->
- decode_file2(Rest, [L|RLs], Ens, Tag, Info0);
-decode_file2([], _, Ens, _, _) ->
- {ok, lists:reverse(Ens)}.
-
-%% Support same as decode_file
-encode_file(Ds) ->
- lists:map(
- fun({cert, Bin, not_encrypted}) ->
- %% PKIX (X.509)
- ["-----BEGIN CERTIFICATE-----\n",
- b64encode_and_split(Bin),
- "-----END CERTIFICATE-----\n\n"];
- ({cert_req, Bin, not_encrypted}) ->
- %% PKCS#10
- ["-----BEGIN CERTIFICATE REQUEST-----\n",
- b64encode_and_split(Bin),
- "-----END CERTIFICATE REQUEST-----\n\n"];
- ({rsa_private_key, Bin, not_encrypted}) ->
- %% PKCS#?
- ["XXX Following key assumed not encrypted\n",
- "-----BEGIN RSA PRIVATE KEY-----\n",
- b64encode_and_split(Bin),
- "-----END RSA PRIVATE KEY-----\n\n"];
- ({dsa_private_key, Bin, not_encrypted}) ->
- %% PKCS#?
- ["XXX Following key assumed not encrypted\n",
- "-----BEGIN DSA PRIVATE KEY-----\n",
- b64encode_and_split(Bin),
- "-----END DSA PRIVATE KEY-----\n\n"]
- end, Ds).
-
-dek_info(Line0, Info) ->
- Line = binary_to_list(Line0),
- [_, DekInfo0] = string:tokens(Line, ": "),
- DekInfo1 = string:tokens(DekInfo0, ",\n"),
- Info ++ DekInfo1.
+b64encode_and_split(Bin) ->
+ split_lines(base64:encode(Bin)).
-unhex(S) ->
- unhex(S, []).
+split_lines(<<Text:?ENCODED_LINE_LENGTH/binary, Rest/binary>>) ->
+ [Text, $\n | split_lines(Rest)];
+split_lines(Bin) ->
+ [Bin, $\n].
-unhex("", Acc) ->
- list_to_binary(lists:reverse(Acc));
-unhex([D1, D2 | Rest], Acc) ->
- unhex(Rest, [erlang:list_to_integer([D1, D2], 16) | Acc]).
+%% Ignore white space at end of line
+join_entry([<<"-----END CERTIFICATE-----", _/binary>>| Lines], Entry) ->
+ {lists:reverse(Entry), Lines};
+join_entry([<<"-----END RSA PRIVATE KEY-----", _/binary>>| Lines], Entry) ->
+ {lists:reverse(Entry), Lines};
+join_entry([<<"-----END DSA PRIVATE KEY-----", _/binary>>| Lines], Entry) ->
+ {lists:reverse(Entry), Lines};
+join_entry([<<"-----END DH PARAMETERS-----", _/binary>>| Lines], Entry) ->
+ {lists:reverse(Entry), Lines};
+join_entry([Line | Lines], Entry) ->
+ join_entry(Lines, [Line | Entry]).
-decode_key(Data, no_passwd, _Alg, _Salt) ->
- Data;
decode_key(Data, Password, "DES-CBC", Salt) ->
Key = password_to_key(Password, Salt, 8),
IV = Salt,
@@ -177,6 +172,16 @@ decode_key(Data, Password, "DES-EDE3-CBC", Salt) ->
<<Key1:8/binary, Key2:8/binary, Key3:8/binary>> = Key,
crypto:des_ede3_cbc_decrypt(Key1, Key2, Key3, IV, Data).
+encode_key(Data, Password, "DES-CBC", Salt) ->
+ Key = password_to_key(Password, Salt, 8),
+ IV = Salt,
+ crypto:des_cbc_encrypt(Key, IV, Data);
+encode_key(Data, Password, "DES-EDE3-CBC", Salt) ->
+ Key = password_to_key(Password, Salt, 24),
+ IV = Salt,
+ <<Key1:8/binary, Key2:8/binary, Key3:8/binary>> = Key,
+ crypto:des_ede3_cbc_encrypt(Key1, Key2, Key3, IV, Data).
+
password_to_key(Data, Salt, KeyLen) ->
<<Key:KeyLen/binary, _/binary>> =
password_to_key(<<>>, Data, Salt, KeyLen, <<>>),
@@ -188,11 +193,58 @@ password_to_key(Prev, Data, Salt, Len, Acc) ->
M = crypto:md5([Prev, Data, Salt]),
password_to_key(M, Data, Salt, Len - size(M), <<Acc/binary, M/binary>>).
-b64encode_and_split(Bin) ->
- split_lines(base64:encode(Bin)).
+unhex(S) ->
+ unhex(S, []).
-split_lines(<<Text:?ENCODED_LINE_LENGTH/binary, Rest/binary>>) ->
- [Text, $\n | split_lines(Rest)];
-split_lines(Bin) ->
- [Bin, $\n].
+unhex("", Acc) ->
+ list_to_binary(lists:reverse(Acc));
+unhex([D1, D2 | Rest], Acc) ->
+ unhex(Rest, [erlang:list_to_integer([D1, D2], 16) | Acc]).
+
+hexify(L) -> [[hex_byte(B)] || B <- binary_to_list(L)].
+
+hex_byte(B) when B < 16#10 -> ["0", erlang:integer_to_list(B, 16)];
+hex_byte(B) -> erlang:integer_to_list(B, 16).
+
+pem_start('Certificate') ->
+ <<"-----BEGIN CERTIFICATE-----">>;
+pem_start('RSAPrivateKey') ->
+ <<"-----BEGIN RSA PRIVATE KEY-----">>;
+pem_start('DSAPrivateKey') ->
+ <<"-----BEGIN DSA PRIVATE KEY-----">>;
+pem_start('DHParameter') ->
+ <<"-----BEGIN DH PARAMETERS-----">>.
+
+pem_end(<<"-----BEGIN CERTIFICATE-----">>) ->
+ <<"-----END CERTIFICATE-----">>;
+pem_end(<<"-----BEGIN RSA PRIVATE KEY-----">>) ->
+ <<"-----END RSA PRIVATE KEY-----">>;
+pem_end(<<"-----BEGIN DSA PRIVATE KEY-----">>) ->
+ <<"-----END DSA PRIVATE KEY-----">>;
+pem_end(<<"-----BEGIN DH PARAMETERS-----">>) ->
+ <<"-----END DH PARAMETERS-----">>;
+pem_end(_) ->
+ undefined.
+
+asn1_type(<<"-----BEGIN CERTIFICATE-----">>) ->
+ 'Certificate';
+asn1_type(<<"-----BEGIN RSA PRIVATE KEY-----">>) ->
+ 'RSAPrivateKey';
+asn1_type(<<"-----BEGIN DSA PRIVATE KEY-----">>) ->
+ 'DSAPrivateKey';
+asn1_type(<<"-----BEGIN DH PARAMETERS-----">>) ->
+ 'DHParameter'.
+
+pem_decrypt() ->
+ <<"Proc-Type: 4,ENCRYPTED">>.
+
+pem_decrypt_info(Cipher, Salt) ->
+ io_lib:format("DEK-Info: ~s,~s", [Cipher, lists:flatten(hexify(Salt))]).
+%%--------------------------------------------------------------------
+%%% Deprecated
+%%--------------------------------------------------------------------
+decode_key({_Type, Bin, not_encrypted}, _) ->
+ Bin;
+decode_key({_Type, Bin, {Chipher,Salt}}, Password) ->
+ decode_key(Bin, Password, Chipher, Salt).
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-10 12:12:06 +0000