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LibTLS: Allow using other hash algorithms for HMAC

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The standard allows for ciphers to define which hash to use.
Fixes #7348
This commit is contained in:
DexesTTP 2021-05-29 08:26:10 +02:00 • committed by Ali Mohammad Pur
parent cb4a0dec8a
commit 4bbf954ad0
4 changed files with 56 additions and 14 deletions
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13
Userland/Libraries/LibTLS/Handshake.cpp
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@ -140,12 +140,17 @@ ByteBuffer TLSv12::build_handshake_finished()
PacketBuilder builder { MessageType::Handshake, m_context.options.version, 12 + 64 };
builder.append((u8)HandshakeType::Finished);
constexpr u32 out_size = 12;
// RFC 5246 section 7.4.9: "In previous versions of TLS, the verify_data was always 12 octets
// long. In the current version of TLS, it depends on the cipher
// suite. Any cipher suite which does not explicitly specify
// verify_data_length has a verify_data_length equal to 12."
// Simplification: Assume that verify_data_length is always 12.
constexpr u32 verify_data_length = 12;
builder.append_u24(out_size);
builder.append_u24(verify_data_length);
u8 out[out_size];
auto outbuffer = Bytes { out, out_size };
u8 out[verify_data_length];
auto outbuffer = Bytes { out, verify_data_length };
auto dummy = ByteBuffer::create_zeroed(0);
auto digest = m_context.handshake_hash.digest();