diff options
Diffstat (limited to 'lib/ssl/src/dtls_record.erl')
| -rw-r--r-- | lib/ssl/src/dtls_record.erl | 62 |
1 files changed, 57 insertions, 5 deletions
diff --git a/lib/ssl/src/dtls_record.erl b/lib/ssl/src/dtls_record.erl index a7bbb6bc40..c0776e822b 100644 --- a/lib/ssl/src/dtls_record.erl +++ b/lib/ssl/src/dtls_record.erl @@ -120,6 +120,26 @@ get_dtls_records_aux(Data, Acc) -> end. encode_plain_text(Type, Version, Data, + #connection_states{current_write = + #connection_state{ + epoch = Epoch, + sequence_number = Seq, + compression_state=CompS0, + security_parameters= + #security_parameters{ + cipher_type = ?AEAD, + compression_algorithm=CompAlg} + }= WriteState0} = ConnectionStates) -> + {Comp, CompS1} = ssl_record:compress(CompAlg, Data, CompS0), + WriteState1 = WriteState0#connection_state{compression_state = CompS1}, + AAD = calc_aad(Type, Version, Epoch, Seq), + {CipherFragment, WriteState} = ssl_record:cipher_aead(dtls_v1:corresponding_tls_version(Version), + Comp, WriteState1, AAD), + CipherText = encode_tls_cipher_text(Type, Version, Epoch, Seq, CipherFragment), + {CipherText, ConnectionStates#connection_states{current_write = + WriteState#connection_state{sequence_number = Seq +1}}}; + +encode_plain_text(Type, Version, Data, #connection_states{current_write=#connection_state{ epoch = Epoch, sequence_number = Seq, @@ -141,16 +161,44 @@ decode_cipher_text(#ssl_tls{type = Type, version = Version, sequence_number = Seq, fragment = CipherFragment} = CipherText, #connection_states{current_read = - #connection_state{compression_state = CompressionS0, - security_parameters = SecParams} = ReadState0} - = ConnnectionStates0) -> - CompressAlg = SecParams#security_parameters.compression_algorithm, + #connection_state{ + compression_state = CompressionS0, + security_parameters= + #security_parameters{ + cipher_type = ?AEAD, + compression_algorithm=CompAlg} + } = ReadState0}= ConnnectionStates0) -> + AAD = calc_aad(Type, Version, Epoch, Seq), + case ssl_record:decipher_aead(dtls_v1:corresponding_tls_version(Version), + CipherFragment, ReadState0, AAD) of + {PlainFragment, ReadState1} -> + {Plain, CompressionS1} = ssl_record:uncompress(CompAlg, + PlainFragment, CompressionS0), + ConnnectionStates = ConnnectionStates0#connection_states{ + current_read = ReadState1#connection_state{ + compression_state = CompressionS1}}, + {CipherText#ssl_tls{fragment = Plain}, ConnnectionStates}; + #alert{} = Alert -> + Alert + end; + +decode_cipher_text(#ssl_tls{type = Type, version = Version, + epoch = Epoch, + sequence_number = Seq, + fragment = CipherFragment} = CipherText, + #connection_states{current_read = + #connection_state{ + compression_state = CompressionS0, + security_parameters= + #security_parameters{ + compression_algorithm=CompAlg} + } = ReadState0}= ConnnectionStates0) -> {PlainFragment, Mac, ReadState1} = ssl_record:decipher(dtls_v1:corresponding_tls_version(Version), CipherFragment, ReadState0), MacHash = calc_mac_hash(ReadState1, Type, Version, Epoch, Seq, PlainFragment), case ssl_record:is_correct_mac(Mac, MacHash) of true -> - {Plain, CompressionS1} = ssl_record:uncompress(CompressAlg, + {Plain, CompressionS1} = ssl_record:uncompress(CompAlg, PlainFragment, CompressionS0), ConnnectionStates = ConnnectionStates0#connection_states{ current_read = ReadState1#connection_state{ @@ -368,3 +416,7 @@ calc_mac_hash(#connection_state{mac_secret = MacSecret, mac_hash(Version, MacAlg, MacSecret, SeqNo, Type, Length, Fragment) -> dtls_v1:mac_hash(Version, MacAlg, MacSecret, SeqNo, Type, Length, Fragment). + +calc_aad(Type, {MajVer, MinVer}, Epoch, SeqNo) -> + NewSeq = (Epoch bsl 48) + SeqNo, + <<NewSeq:64/integer, ?BYTE(Type), ?BYTE(MajVer), ?BYTE(MinVer)>>. |