null-crypto.cpp

#include "null-crypto.h"

#include "log.h"


namespace quic {

// Cranks a value to "11", i.e. set it to its maximum
template <typename T>
void crank_to_eleven(T& val) { val = std::numeric_limits<T>::max(); }

NullCrypto::NullCrypto() {
    crank_to_eleven(null_ctx.max_encryption);
    crank_to_eleven(null_ctx.max_decryption_failure);
    null_ctx.aead.max_overhead = 1; // Fails an assertion if 0
    null_aead.max_overhead = 1; // FIXME - can this be 0?
}

void NullCrypto::client_initial(Connection& conn) {
    ngtcp2_conn_set_initial_crypto_ctx(conn, &null_ctx);
    ngtcp2_conn_install_initial_key(conn, &null_aead_ctx, null_iv.data(), &null_cipher_ctx, &null_aead_ctx, null_iv.data(), &null_cipher_ctx, null_iv.size());
    ngtcp2_conn_set_retry_aead(conn, &null_aead, &null_aead_ctx);
    ngtcp2_conn_set_crypto_ctx(conn, &null_ctx);
}

void NullCrypto::server_initial(Connection& conn) {
    Debug("Server initial null crypto setup");
    ngtcp2_conn_set_initial_crypto_ctx(conn, &null_ctx);
    ngtcp2_conn_install_initial_key(conn, &null_aead_ctx, null_iv.data(), &null_cipher_ctx, &null_aead_ctx, null_iv.data(), &null_cipher_ctx, null_iv.size());
    ngtcp2_conn_set_crypto_ctx(conn, &null_ctx);
}

bool NullCrypto::install_tx_handshake_key(Connection& conn) {
    return ngtcp2_conn_install_tx_handshake_key(conn, &null_aead_ctx, null_iv.data(), null_iv.size(), &null_cipher_ctx) == 0;
}
bool NullCrypto::install_rx_handshake_key(Connection& conn) {
    return ngtcp2_conn_install_rx_handshake_key(conn, &null_aead_ctx, null_iv.data(), null_iv.size(), &null_cipher_ctx) == 0;
}
bool NullCrypto::install_tx_key(Connection& conn) {
    return ngtcp2_conn_install_tx_key(conn, null_iv.data(), null_iv.size(), &null_aead_ctx, null_iv.data(), null_iv.size(), &null_cipher_ctx) == 0;
}
bool NullCrypto::install_rx_key(Connection& conn) {
    return ngtcp2_conn_install_rx_key(conn, nullptr, 0, &null_aead_ctx, null_iv.data(), null_iv.size(), &null_cipher_ctx) == 0;
}

}