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LibTLS: Define cipher suite parameters and components in a macro
Instead of sprinkling the definition of the ciper suites all over the TLS implementation, let's regroup it all once and for all in a single place, and then add our new implementations there.
This commit is contained in:
DexesTTP
Andreas Kling
parent
17a1f51579
commit
6d190b299e
2 changed files with 84 additions and 56 deletions
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@ -42,6 +42,31 @@ enum class SignatureAlgorithm : u8 {
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ECDSA = 3,
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};
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enum class CipherAlgorithm {
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AES_128_CBC,
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AES_128_GCM,
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AES_128_CCM,
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AES_128_CCM_8,
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AES_256_CBC,
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AES_256_GCM,
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};
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constexpr size_t cipher_key_size(CipherAlgorithm algorithm)
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{
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switch (algorithm) {
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case CipherAlgorithm::AES_128_CBC:
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case CipherAlgorithm::AES_128_GCM:
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case CipherAlgorithm::AES_128_CCM:
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case CipherAlgorithm::AES_128_CCM_8:
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return 128;
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case CipherAlgorithm::AES_256_CBC:
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case CipherAlgorithm::AES_256_GCM:
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return 256;
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default:
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return 128;
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}
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}
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struct SignatureAndHashAlgorithm {
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HashAlgorithm hash;
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SignatureAlgorithm signature;
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@ -163,18 +163,39 @@ enum ClientVerificationStaus {
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VerificationNeeded,
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};
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// Note for the 16 iv length instead of 8:
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// 4 bytes of fixed IV, 8 random (nonce) bytes, 4 bytes for counter
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// GCM specifically asks us to transmit only the nonce, the counter is zero
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// and the fixed IV is derived from the premaster key.
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#define ENUMERATE_CIPHERS(C) \
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C(false, CipherSuite::AES_128_GCM_SHA256, SignatureAlgorithm::Anonymous, CipherAlgorithm::AES_128_GCM, Crypto::Hash::SHA256, 8, true) \
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C(false, CipherSuite::AES_256_GCM_SHA384, SignatureAlgorithm::Anonymous, CipherAlgorithm::AES_256_GCM, Crypto::Hash::SHA384, 8, true) \
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C(false, CipherSuite::AES_128_CCM_SHA256, SignatureAlgorithm::Anonymous, CipherAlgorithm::AES_128_CCM, Crypto::Hash::SHA256, 16, false) \
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C(false, CipherSuite::AES_128_CCM_8_SHA256, SignatureAlgorithm::Anonymous, CipherAlgorithm::AES_128_CCM_8, Crypto::Hash::SHA256, 16, false) \
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C(true, CipherSuite::RSA_WITH_AES_128_CBC_SHA, SignatureAlgorithm::RSA, CipherAlgorithm::AES_128_CBC, Crypto::Hash::SHA1, 16, false) \
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C(true, CipherSuite::RSA_WITH_AES_256_CBC_SHA, SignatureAlgorithm::RSA, CipherAlgorithm::AES_256_CBC, Crypto::Hash::SHA1, 16, false) \
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C(true, CipherSuite::RSA_WITH_AES_128_CBC_SHA256, SignatureAlgorithm::RSA, CipherAlgorithm::AES_128_CBC, Crypto::Hash::SHA256, 16, false) \
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C(true, CipherSuite::RSA_WITH_AES_256_CBC_SHA256, SignatureAlgorithm::RSA, CipherAlgorithm::AES_256_CBC, Crypto::Hash::SHA256, 16, false) \
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C(true, CipherSuite::RSA_WITH_AES_128_GCM_SHA256, SignatureAlgorithm::RSA, CipherAlgorithm::AES_128_GCM, Crypto::Hash::SHA256, 8, true) \
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C(false, CipherSuite::RSA_WITH_AES_256_GCM_SHA384, SignatureAlgorithm::RSA, CipherAlgorithm::AES_256_GCM, Crypto::Hash::SHA384, 8, true)
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struct Options {
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static Vector<CipherSuite> default_usable_cipher_suites()
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{
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Vector<CipherSuite> cipher_suites;
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#define C(is_supported, suite, signature, cipher, hash, iv_size, is_aead) \
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if constexpr (is_supported) \
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cipher_suites.empend(suite);
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ENUMERATE_CIPHERS(C)
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#undef C
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return cipher_suites;
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}
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Vector<CipherSuite> usable_cipher_suites = default_usable_cipher_suites();
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#define OPTION_WITH_DEFAULTS(typ, name, ...) \
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static typ default_##name() { return typ { __VA_ARGS__ }; } \
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typ name = default_##name();
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OPTION_WITH_DEFAULTS(Vector<CipherSuite>, usable_cipher_suites,
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CipherSuite::RSA_WITH_AES_128_CBC_SHA256,
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CipherSuite::RSA_WITH_AES_256_CBC_SHA256,
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CipherSuite::RSA_WITH_AES_128_CBC_SHA,
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CipherSuite::RSA_WITH_AES_256_CBC_SHA,
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CipherSuite::RSA_WITH_AES_128_GCM_SHA256)
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OPTION_WITH_DEFAULTS(Version, version, Version::V12)
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OPTION_WITH_DEFAULTS(Vector<SignatureAndHashAlgorithm>, supported_signature_algorithms,
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{ HashAlgorithm::SHA512, SignatureAlgorithm::RSA },
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@ -297,11 +318,15 @@ public:
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bool supports_cipher(CipherSuite suite) const
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{
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return suite == CipherSuite::RSA_WITH_AES_128_CBC_SHA256
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|| suite == CipherSuite::RSA_WITH_AES_256_CBC_SHA256
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|| suite == CipherSuite::RSA_WITH_AES_128_CBC_SHA
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|| suite == CipherSuite::RSA_WITH_AES_256_CBC_SHA
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|| suite == CipherSuite::RSA_WITH_AES_128_GCM_SHA256;
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switch (suite) {
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#define C(is_supported, suite, signature, cipher, hash, iv_size, is_aead) \
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case suite: \
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return is_supported;
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ENUMERATE_CIPHERS(C)
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#undef C
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default:
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return false;
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}
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}
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bool supports_version(Version v) const
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@ -376,72 +401,50 @@ private:
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size_t key_length() const
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{
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switch (m_context.cipher) {
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case CipherSuite::AES_128_CCM_8_SHA256:
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case CipherSuite::AES_128_CCM_SHA256:
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case CipherSuite::AES_128_GCM_SHA256:
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case CipherSuite::Invalid:
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case CipherSuite::RSA_WITH_AES_128_CBC_SHA256:
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case CipherSuite::RSA_WITH_AES_128_CBC_SHA:
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case CipherSuite::RSA_WITH_AES_128_GCM_SHA256:
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#define C(is_supported, suite, signature, cipher, hash, iv_size, is_aead) \
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case suite: \
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return cipher_key_size(cipher) / 8;
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ENUMERATE_CIPHERS(C)
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#undef C
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default:
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return 128 / 8;
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case CipherSuite::AES_256_GCM_SHA384:
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case CipherSuite::RSA_WITH_AES_256_CBC_SHA:
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case CipherSuite::RSA_WITH_AES_256_CBC_SHA256:
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case CipherSuite::RSA_WITH_AES_256_GCM_SHA384:
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return 256 / 8;
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}
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}
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size_t mac_length() const
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{
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switch (m_context.cipher) {
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case CipherSuite::RSA_WITH_AES_128_CBC_SHA:
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case CipherSuite::RSA_WITH_AES_256_CBC_SHA:
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return Crypto::Hash::SHA1::digest_size();
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case CipherSuite::AES_256_GCM_SHA384:
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case CipherSuite::RSA_WITH_AES_256_GCM_SHA384:
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return Crypto::Hash::SHA512::digest_size();
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case CipherSuite::AES_128_CCM_8_SHA256:
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case CipherSuite::AES_128_CCM_SHA256:
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case CipherSuite::AES_128_GCM_SHA256:
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case CipherSuite::Invalid:
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case CipherSuite::RSA_WITH_AES_128_CBC_SHA256:
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case CipherSuite::RSA_WITH_AES_128_GCM_SHA256:
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case CipherSuite::RSA_WITH_AES_256_CBC_SHA256:
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#define C(is_supported, suite, signature, cipher, hash, iv_size, is_aead) \
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case suite: \
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return hash ::digest_size();
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ENUMERATE_CIPHERS(C)
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#undef C
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default:
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return Crypto::Hash::SHA256::digest_size();
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}
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}
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size_t iv_length() const
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{
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switch (m_context.cipher) {
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case CipherSuite::AES_128_CCM_8_SHA256:
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case CipherSuite::AES_128_CCM_SHA256:
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case CipherSuite::Invalid:
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case CipherSuite::RSA_WITH_AES_128_CBC_SHA256:
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case CipherSuite::RSA_WITH_AES_128_CBC_SHA:
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case CipherSuite::RSA_WITH_AES_256_CBC_SHA256:
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case CipherSuite::RSA_WITH_AES_256_CBC_SHA:
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#define C(is_supported, suite, signature, cipher, hash, iv_size, is_aead) \
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case suite: \
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return iv_size;
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ENUMERATE_CIPHERS(C)
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#undef C
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default:
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return 16;
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case CipherSuite::AES_128_GCM_SHA256:
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case CipherSuite::AES_256_GCM_SHA384:
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case CipherSuite::RSA_WITH_AES_128_GCM_SHA256:
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case CipherSuite::RSA_WITH_AES_256_GCM_SHA384:
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return 8; // 4 bytes of fixed IV, 8 random (nonce) bytes, 4 bytes for counter
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// GCM specifically asks us to transmit only the nonce, the counter is zero
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// and the fixed IV is derived from the premaster key.
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}
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}
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bool is_aead() const
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{
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switch (m_context.cipher) {
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case CipherSuite::AES_128_GCM_SHA256:
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case CipherSuite::AES_256_GCM_SHA384:
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case CipherSuite::RSA_WITH_AES_128_GCM_SHA256:
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case CipherSuite::RSA_WITH_AES_256_GCM_SHA384:
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return true;
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#define C(is_supported, suite, signature, cipher, hash, iv_size, is_aead) \
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case suite: \
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return is_aead;
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ENUMERATE_CIPHERS(C)
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#undef C
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default:
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return false;
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}
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