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/*
* Certificate Verify Message
* (C) 2004,2006,2011,2012 Jack Lloyd
*
* Released under the terms of the Botan license
*/
#include <botan/internal/tls_messages.h>
#include <botan/internal/tls_reader.h>
#include <botan/internal/tls_extensions.h>
#include <botan/internal/tls_handshake_io.h>
#include <botan/internal/assert.h>
#include <memory>
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_hash_algo, m_sig_algo, true, policy);
PK_Signer signer(*priv_key, format.first, format.second);
if(state->version() == Protocol_Version::SSL_V3)
{
secure_vector<byte> md5_sha = state->hash().final_ssl3(
state->session_keys().master_secret());
if(priv_key->algo_name() == "DSA")
m_signature = signer.sign_message(&md5_sha[16], md5_sha.size()-16, rng);
else
m_signature = signer.sign_message(md5_sha, rng);
}
else
{
m_signature = signer.sign_message(state->hash().get_contents(), rng);
}
state->hash().update(io.send(*this));
}
/*
* Deserialize a Certificate Verify message
*/
Certificate_Verify::Certificate_Verify(const std::vector<byte>& buf,
Protocol_Version version)
{
TLS_Data_Reader reader(buf);
if(version.supports_negotiable_signature_algorithms())
{
m_hash_algo = Signature_Algorithms::hash_algo_name(reader.get_byte());
m_sig_algo = Signature_Algorithms::sig_algo_name(reader.get_byte());
}
m_signature = reader.get_range<byte>(2, 0, 65535);
}
/*
* Serialize a Certificate Verify message
*/
std::vector<byte> Certificate_Verify::serialize() const
{
std::vector<byte> buf;
if(m_hash_algo != "" && m_sig_algo != "")
{
buf.push_back(Signature_Algorithms::hash_algo_code(m_hash_algo));
buf.push_back(Signature_Algorithms::sig_algo_code(m_sig_algo));
}
const u16bit sig_len = 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
{
std::unique_ptr<Public_Key> key(cert.subject_public_key());
std::pair<std::string, Signature_Format> format =
state->understand_sig_format(key.get(), m_hash_algo, m_sig_algo, true);
PK_Verifier verifier(*key, format.first, format.second);
if(state->version() == Protocol_Version::SSL_V3)
{
secure_vector<byte> md5_sha = state->hash().final_ssl3(
state->session_keys().master_secret());
return verifier.verify_message(&md5_sha[16], md5_sha.size()-16,
&m_signature[0], m_signature.size());
}
return verifier.verify_message(state->hash().get_contents(), m_signature);
}
}
}
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