Function ProcessOldClientHello

extra/yassl/src/handshake.cpp:523–594

some clients still send sslv2 client hello

// some clients still send sslv2 client hello
void ProcessOldClientHello(input_buffer& input, SSL& ssl)
{
    if (input.get_error() || input.get_remaining() < 2) {
        ssl.SetError(bad_input);
        return;
    }
    byte b0 = input[AUTO];
    byte b1 = input[AUTO];

    uint16 sz = ((b0 & 0x7f) << 8) | b1;

    if (sz > input.get_remaining()) {
        ssl.SetError(bad_input);
        return;
    }

    // hashHandShake manually
    const opaque* buffer = input.get_buffer() + input.get_current();
    ssl.useHashes().use_MD5().update(buffer, sz);
    ssl.useHashes().use_SHA().update(buffer, sz);

    b1 = input[AUTO];  // does this value mean client_hello?

    ClientHello ch;
    ch.client_version_.major_ = input[AUTO];
    ch.client_version_.minor_ = input[AUTO];

    byte len[2];

    len[0] = input[AUTO];
    len[1] = input[AUTO];
    ato16(len, ch.suite_len_);

    len[0] = input[AUTO];
    len[1] = input[AUTO];
    uint16 sessionLen;
    ato16(len, sessionLen);
    ch.id_len_ = sessionLen;

    len[0] = input[AUTO];
    len[1] = input[AUTO];
    uint16 randomLen;
    ato16(len, randomLen);

    if (input.get_error() || ch.suite_len_ > MAX_SUITE_SZ ||
                             ch.suite_len_ > input.get_remaining() ||
                             sessionLen > ID_LEN || randomLen > RAN_LEN) {
        ssl.SetError(bad_input);
        return;
    }

    int j = 0;
    for (uint16 i = 0; i < ch.suite_len_; i += 3) {    
        byte first = input[AUTO];
        if (first)  // sslv2 type
            input.read(len, SUITE_LEN); // skip
        else {
            input.read(&ch.cipher_suites_[j], SUITE_LEN);