/*
* Certificate Status
* (C) 2016 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/

#include <botan/tls_messages.h>

#include <botan/ber_dec.h>
#include <botan/der_enc.h>
#include <botan/ocsp.h>
#include <botan/tls_extensions.h>
#include <botan/internal/tls_handshake_hash.h>
#include <botan/internal/tls_handshake_io.h>
#include <botan/internal/tls_reader.h>

namespace Botan::TLS {

Certificate_Status::Certificate_Status(const std::vector<uint8_t>& buf, const Connection_Side) {
   if(buf.size() < 5) {
      throw Decoding_Error("Invalid Certificate_Status message: too small");
   }

   if(buf[0] != 1) {  // not OCSP
      throw Decoding_Error("Unexpected Certificate_Status message: unexpected response type");
   }

   size_t len = make_uint32(0, buf[1], buf[2], buf[3]);

   // Verify the redundant length field...
   if(buf.size() != len + 4) {
      throw Decoding_Error("Invalid Certificate_Status: invalid length field");
   }

   m_response.assign(buf.begin() + 4, buf.end());
}

Certificate_Status::Certificate_Status(Handshake_IO& io, Handshake_Hash& hash, const OCSP::Response& ocsp) :
      m_response(ocsp.raw_bits()) {
   hash.update(io.send(*this));
}

Certificate_Status::Certificate_Status(Handshake_IO& io,
                                       Handshake_Hash& hash,
                                       std::vector<uint8_t> raw_response_bytes) :
      Certificate_Status(std::move(raw_response_bytes)) {
   hash.update(io.send(*this));
}

Certificate_Status::Certificate_Status(std::vector<uint8_t> raw_response_bytes) :
      m_response(std::move(raw_response_bytes)) {}

std::vector<uint8_t> Certificate_Status::serialize() const {
   if(m_response.size() > 0xFFFFFF) {  // unlikely
      throw Encoding_Error("OCSP response too long to encode in TLS");
   }

   const uint32_t response_len = static_cast<uint32_t>(m_response.size());

   std::vector<uint8_t> buf;
   buf.reserve(1 + 3 + m_response.size());
   buf.push_back(1);  // type OCSP
   for(size_t i = 1; i < 4; ++i) {
      buf.push_back(get_byte_var(i, response_len));
   }

   buf += m_response;
   return buf;
}

}  // namespace Botan::TLS