diff options
Diffstat (limited to 'lib/ssl/src/ssl_tls1.erl')
| -rw-r--r-- | lib/ssl/src/ssl_tls1.erl | 111 |
1 files changed, 87 insertions, 24 deletions
diff --git a/lib/ssl/src/ssl_tls1.erl b/lib/ssl/src/ssl_tls1.erl index dc3d9774c2..9569cef8d1 100644 --- a/lib/ssl/src/ssl_tls1.erl +++ b/lib/ssl/src/ssl_tls1.erl @@ -61,6 +61,18 @@ finished(Role, Version, PrfAlgo, MasterSecret, Handshake) SHA = crypto:sha(Handshake), prf(?MD5SHA, MasterSecret, finished_label(Role), [MD5, SHA], 12); +finished(Role, Version, PrfAlgo, MasterSecret, Handshake) + when Version == 3 -> + %% RFC 5246 - 7.4.9. Finished + %% struct { + %% opaque verify_data[12]; + %% } Finished; + %% + %% verify_data + %% PRF(master_secret, finished_label, Hash(handshake_messages)) [0..11]; + Hash = crypto:hash(mac_algo(PrfAlgo), Handshake), + prf(PrfAlgo, MasterSecret, finished_label(Role), Hash, 12). + -spec certificate_verify(OID::tuple(), [binary()]) -> binary(). certificate_verify(?'rsaEncryption', Handshake) -> @@ -98,29 +110,60 @@ setup_keys(Version, _PrfAlgo, MasterSecret, ServerRandom, ClientRandom, HashSize ClientWriteKey:KeyMatLen/binary, ServerWriteKey:KeyMatLen/binary, ClientIV:IVSize/binary, ServerIV:IVSize/binary>> = KeyBlock, {ClientWriteMacSecret, ServerWriteMacSecret, ClientWriteKey, - ServerWriteKey, ClientIV, ServerIV}. + ServerWriteKey, ClientIV, ServerIV}; + +%% TLS v1.1 +setup_keys(Version, _PrfAlgo, MasterSecret, ServerRandom, ClientRandom, HashSize, + KeyMatLen, IVSize) + when Version == 2 -> + %% RFC 4346 - 6.3. Key calculation + %% key_block = PRF(SecurityParameters.master_secret, + %% "key expansion", + %% SecurityParameters.server_random + + %% SecurityParameters.client_random); + %% Then the key_block is partitioned as follows: + %% client_write_MAC_secret[SecurityParameters.hash_size] + %% server_write_MAC_secret[SecurityParameters.hash_size] + %% client_write_key[SecurityParameters.key_material_length] + %% server_write_key[SecurityParameters.key_material_length] + %% + %% RFC 4346 is incomplete, the client and server IVs have to + %% be generated just like for TLS 1.0 + WantedLength = 2 * (HashSize + KeyMatLen + IVSize), + KeyBlock = prf(?MD5SHA, MasterSecret, "key expansion", + [ServerRandom, ClientRandom], WantedLength), + <<ClientWriteMacSecret:HashSize/binary, + ServerWriteMacSecret:HashSize/binary, + ClientWriteKey:KeyMatLen/binary, ServerWriteKey:KeyMatLen/binary, + ClientIV:IVSize/binary, ServerIV:IVSize/binary>> = KeyBlock, + {ClientWriteMacSecret, ServerWriteMacSecret, ClientWriteKey, + ServerWriteKey, ClientIV, ServerIV}; -%% TLS v1.1 uncomment when supported. -%% setup_keys(MasterSecret, ServerRandom, ClientRandom, HashSize, KeyMatLen) -> -%% %% RFC 4346 - 6.3. Key calculation -%% %% key_block = PRF(SecurityParameters.master_secret, -%% %% "key expansion", -%% %% SecurityParameters.server_random + -%% %% SecurityParameters.client_random); -%% %% Then the key_block is partitioned as follows: -%% %% client_write_MAC_secret[SecurityParameters.hash_size] -%% %% server_write_MAC_secret[SecurityParameters.hash_size] -%% %% client_write_key[SecurityParameters.key_material_length] -%% %% server_write_key[SecurityParameters.key_material_length] -%% WantedLength = 2 * (HashSize + KeyMatLen), -%% KeyBlock = prf(MasterSecret, "key expansion", -%% [ServerRandom, ClientRandom], WantedLength), -%% <<ClientWriteMacSecret:HashSize/binary, -%% ServerWriteMacSecret:HashSize/binary, -%% ClientWriteKey:KeyMatLen/binary, ServerWriteKey:KeyMatLen/binary>> -%% = KeyBlock, -%% {ClientWriteMacSecret, ServerWriteMacSecret, ClientWriteKey, -%% ServerWriteKey, undefined, undefined}. +%% TLS v1.2 +setup_keys(Version, PrfAlgo, MasterSecret, ServerRandom, ClientRandom, HashSize, + KeyMatLen, IVSize) + when Version == 3 -> + %% RFC 5246 - 6.3. Key calculation + %% key_block = PRF(SecurityParameters.master_secret, + %% "key expansion", + %% SecurityParameters.server_random + + %% SecurityParameters.client_random); + %% Then the key_block is partitioned as follows: + %% client_write_MAC_secret[SecurityParameters.hash_size] + %% server_write_MAC_secret[SecurityParameters.hash_size] + %% client_write_key[SecurityParameters.key_material_length] + %% server_write_key[SecurityParameters.key_material_length] + %% client_write_IV[SecurityParameters.fixed_iv_length] + %% server_write_IV[SecurityParameters.fixed_iv_length] + WantedLength = 2 * (HashSize + KeyMatLen + IVSize), + KeyBlock = prf(PrfAlgo, MasterSecret, "key expansion", + [ServerRandom, ClientRandom], WantedLength), + <<ClientWriteMacSecret:HashSize/binary, + ServerWriteMacSecret:HashSize/binary, + ClientWriteKey:KeyMatLen/binary, ServerWriteKey:KeyMatLen/binary, + ClientIV:IVSize/binary, ServerIV:IVSize/binary>> = KeyBlock, + {ClientWriteMacSecret, ServerWriteMacSecret, ClientWriteKey, + ServerWriteKey, ClientIV, ServerIV}. -spec mac_hash(integer(), binary(), integer(), integer(), tls_version(), integer(), binary()) -> binary(). @@ -166,7 +209,22 @@ hmac_hash(?NULL, _, _) -> hmac_hash(?MD5, Key, Value) -> crypto:md5_mac(Key, Value); hmac_hash(?SHA, Key, Value) -> - crypto:sha_mac(Key, Value). + crypto:sha_mac(Key, Value); +hmac_hash(?MD5SHA, Key, Value) -> + crypto:sha256_mac(Key, Value); +hmac_hash(?SHA256, Key, Value) -> + crypto:sha256_mac(Key, Value); +hmac_hash(?SHA384, Key, Value) -> + crypto:sha384_mac(Key, Value); +hmac_hash(?SHA512, Key, Value) -> + crypto:sha512_mac(Key, Value). + +mac_algo(?MD5) -> md5; +mac_algo(?SHA) -> sha; +mac_algo(?MD5SHA) -> sha256; %% RFC 5246 defines minimum hash for TLS 1.2 +mac_algo(?SHA256) -> sha256; +mac_algo(?SHA384) -> sha384; +mac_algo(?SHA512) -> sha512. % First, we define a data expansion function, P_hash(secret, data) that % uses a single hash function to expand a secret and seed into an @@ -224,7 +282,12 @@ prf(MAC, Secret, Label, Seed, WantedLength) {S1, S2} = split_secret(Secret), LS = list_to_binary([Label, Seed]), crypto:exor(p_hash(S1, LS, WantedLength, ?MD5), - p_hash(S2, LS, WantedLength, ?SHA)). + p_hash(S2, LS, WantedLength, ?SHA)); + +prf(MAC, Secret, Label, Seed, WantedLength) -> + %% PRF(secret, label, seed) = P_SHA256(secret, label + seed); + LS = list_to_binary([Label, Seed]), + p_hash(Secret, LS, WantedLength, MAC). %%%% Misc help functions %%%% |