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/*
* Certificate Verify Message
* (C) 2004,2006,2011,2012 Jack Lloyd
* 2017 Harry Reimann, Rohde & Schwarz Cybersecurity
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/tls_messages.h>
#include <botan/tls_extensions.h>
#include <botan/internal/tls_reader.h>
#include <botan/internal/tls_handshake_io.h>
#include <botan/internal/tls_handshake_state.h>
namespace Botan {
namespace TLS {
/*
* Create a new Certificate Verify message
*/
Certificate_Verify::Certificate_Verify(Handshake_IO& io,
Handshake_State& state,
const Policy& policy,
RandomNumberGenerator& rng,
const Private_Key* priv_key)
{
BOTAN_ASSERT_NONNULL(priv_key);
std::pair<std::string, Signature_Format> format =
state.choose_sig_format(*priv_key, m_scheme, true, policy);
m_signature =
state.callbacks().tls_sign_message(*priv_key, rng, format.first, format.second,
state.hash().get_contents());
state.hash().update(io.send(*this));
}
/*
* Deserialize a Certificate Verify message
*/
Certificate_Verify::Certificate_Verify(const std::vector<uint8_t>& buf,
Protocol_Version version)
{
TLS_Data_Reader reader("CertificateVerify", buf);
if(version.supports_negotiable_signature_algorithms())
{
m_scheme = static_cast<Signature_Scheme>(reader.get_uint16_t());
}
m_signature = reader.get_range<uint8_t>(2, 0, 65535);
reader.assert_done();
}
/*
* Serialize a Certificate Verify message
*/
std::vector<uint8_t> Certificate_Verify::serialize() const
{
std::vector<uint8_t> buf;
if(m_scheme != Signature_Scheme::NONE)
{
const uint16_t scheme_code = static_cast<uint16_t>(m_scheme);
buf.push_back(get_byte(0, scheme_code));
buf.push_back(get_byte(1, scheme_code));
}
if(m_signature.size() > 0xFFFF)
throw Encoding_Error("Certificate_Verify signature too long to encode");
const uint16_t sig_len = static_cast<uint16_t>(m_signature.size());
buf.push_back(get_byte(0, sig_len));
buf.push_back(get_byte(1, sig_len));
buf += m_signature;
return buf;
}
/*
* Verify a Certificate Verify message
*/
bool Certificate_Verify::verify(const X509_Certificate& cert,
const Handshake_State& state,
const Policy& policy) const
{
std::unique_ptr<Public_Key> key(cert.subject_public_key());
policy.check_peer_key_acceptable(*key);
std::pair<std::string, Signature_Format> format =
state.parse_sig_format(*key.get(), m_scheme, true, policy);
const bool signature_valid =
state.callbacks().tls_verify_message(*key, format.first, format.second,
state.hash().get_contents(), m_signature);
#if defined(BOTAN_UNSAFE_FUZZER_MODE)
BOTAN_UNUSED(signature_valid);
return true;
#else
return signature_valid;
#endif
}
}
}
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