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LibTLS: Add support for AEAD cipher suites

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And integrate AES-GCM.
This commit is contained in:
AnotherTest 2020-11-13 01:59:36 +03:30 • committed by Andreas Kling
parent d3c52cef86
commit 1172746633
4 changed files with 253 additions and 85 deletions
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40
Libraries/LibTLS/Exchange.cpp
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@ -35,6 +35,8 @@ bool TLSv12::expand_key()
u8 key[192]; // soooooooo many constants
auto key_buffer = ByteBuffer::wrap(key, 192);
auto is_aead = this->is_aead();
if (m_context.master_key.size() == 0) {
dbg() << "expand_key() with empty master key";
return false;
@ -52,10 +54,14 @@ bool TLSv12::expand_key()
ByteBuffer::wrap(m_context.local_random, 32));
size_t offset = 0;
memcpy(m_context.crypto.local_mac, key + offset, mac_size);
offset += mac_size;
memcpy(m_context.crypto.remote_mac, key + offset, mac_size);
offset += mac_size;
if (is_aead) {
iv_size = 4; // Explicit IV size.
} else {
memcpy(m_context.crypto.local_mac, key + offset, mac_size);
offset += mac_size;
memcpy(m_context.crypto.remote_mac, key + offset, mac_size);
offset += mac_size;
}
auto client_key = key + offset;
offset += key_size;
@ -75,17 +81,27 @@ bool TLSv12::expand_key()
print_buffer(client_iv, iv_size);
dbg() << "server iv";
print_buffer(server_iv, iv_size);
dbg() << "client mac key";
print_buffer(m_context.crypto.local_mac, mac_size);
dbg() << "server mac key";
print_buffer(m_context.crypto.remote_mac, mac_size);
if (!is_aead) {
dbg() << "client mac key";
print_buffer(m_context.crypto.local_mac, mac_size);
dbg() << "server mac key";
print_buffer(m_context.crypto.remote_mac, mac_size);
}
#endif
memcpy(m_context.crypto.local_iv, client_iv, iv_size);
memcpy(m_context.crypto.remote_iv, server_iv, iv_size);
if (is_aead) {
memcpy(m_context.crypto.local_aead_iv, client_iv, iv_size);
memcpy(m_context.crypto.remote_aead_iv, server_iv, iv_size);
m_aes_local = make<Crypto::Cipher::AESCipher::CBCMode>(ByteBuffer::wrap(client_key, key_size), key_size * 8, Crypto::Cipher::Intent::Encryption, Crypto::Cipher::PaddingMode::RFC5246);
m_aes_remote = make<Crypto::Cipher::AESCipher::CBCMode>(ByteBuffer::wrap(server_key, key_size), key_size * 8, Crypto::Cipher::Intent::Decryption, Crypto::Cipher::PaddingMode::RFC5246);
m_aes_local.gcm = make<Crypto::Cipher::AESCipher::GCMMode>(ByteBuffer::wrap(client_key, key_size), key_size * 8, Crypto::Cipher::Intent::Encryption, Crypto::Cipher::PaddingMode::RFC5246);
m_aes_remote.gcm = make<Crypto::Cipher::AESCipher::GCMMode>(ByteBuffer::wrap(server_key, key_size), key_size * 8, Crypto::Cipher::Intent::Decryption, Crypto::Cipher::PaddingMode::RFC5246);
} else {
memcpy(m_context.crypto.local_iv, client_iv, iv_size);
memcpy(m_context.crypto.remote_iv, server_iv, iv_size);
m_aes_local.cbc = make<Crypto::Cipher::AESCipher::CBCMode>(ByteBuffer::wrap(client_key, key_size), key_size * 8, Crypto::Cipher::Intent::Encryption, Crypto::Cipher::PaddingMode::RFC5246);
m_aes_remote.cbc = make<Crypto::Cipher::AESCipher::CBCMode>(ByteBuffer::wrap(server_key, key_size), key_size * 8, Crypto::Cipher::Intent::Decryption, Crypto::Cipher::PaddingMode::RFC5246);
}
m_context.crypto.created = 1;