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LibTLS: Implement the extended_master_secret TLS extension

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This commit is contained in:
Michiel Visser 2023-11-25 00:27:45 +01:00 • committed by Ali Mohammad Pur
parent 5ab64320b2
commit e785172290
4 changed files with 34 additions and 6 deletions
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25
Userland/Libraries/LibTLS/HandshakeClient.cpp
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@ -126,12 +126,25 @@ bool TLSv12::compute_master_secret_from_pre_master_secret(size_t length)
return false;
}
pseudorandom_function(
m_context.master_key,
m_context.premaster_key,
(u8 const*)"master secret", 13,
ReadonlyBytes { m_context.local_random, sizeof(m_context.local_random) },
ReadonlyBytes { m_context.remote_random, sizeof(m_context.remote_random) });
if (m_context.extensions.extended_master_secret) {
Crypto::Hash::Manager handshake_hash_copy = m_context.handshake_hash.copy();
auto digest = handshake_hash_copy.digest();
auto session_hash = ReadonlyBytes { digest.immutable_data(), handshake_hash_copy.digest_size() };
pseudorandom_function(
m_context.master_key,
m_context.premaster_key,
(u8 const*)"extended master secret", 22,
session_hash,
{});
} else {
pseudorandom_function(
m_context.master_key,
m_context.premaster_key,
(u8 const*)"master secret", 13,
ReadonlyBytes { m_context.local_random, sizeof(m_context.local_random) },
ReadonlyBytes { m_context.remote_random, sizeof(m_context.remote_random) });
}
m_context.premaster_key.clear();
if constexpr (TLS_DEBUG) {