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/*
* Certificate Verify Message
* (C) 2004-2011 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/assert.h>
#include <botan/tls_exceptn.h>
#include <botan/pubkey.h>
#include <botan/rsa.h>
#include <botan/dsa.h>
#include <botan/loadstor.h>
#include <memory>
namespace Botan {
/*
* Create a new Certificate Verify message
*/
Certificate_Verify::Certificate_Verify(RandomNumberGenerator& rng,
Record_Writer& writer,
TLS_Handshake_Hash& hash,
const Private_Key* priv_key)
{
BOTAN_ASSERT_NONNULL(priv_key);
std::string padding = "";
Signature_Format format = IEEE_1363;
if(priv_key->algo_name() == "RSA")
padding = "EMSA3(TLS.Digest.0)";
else if(priv_key->algo_name() == "DSA")
{
padding = "EMSA1(SHA-1)";
format = DER_SEQUENCE;
}
else
throw Invalid_Argument(priv_key->algo_name() +
" is invalid/unknown for TLS signatures");
PK_Signer signer(*priv_key, padding, format);
signature = signer.sign_message(hash.final(), rng);
send(writer, hash);
}
/*
* Serialize a Certificate Verify message
*/
MemoryVector<byte> Certificate_Verify::serialize() const
{
MemoryVector<byte> buf;
const u16bit sig_len = signature.size();
buf.push_back(get_byte(0, sig_len));
buf.push_back(get_byte(1, sig_len));
buf += signature;
return buf;
}
/*
* Deserialize a Certificate Verify message
*/
void Certificate_Verify::deserialize(const MemoryRegion<byte>& buf)
{
TLS_Data_Reader reader(buf);
signature = reader.get_range<byte>(2, 0, 65535);
}
/*
* Verify a Certificate Verify message
*/
bool Certificate_Verify::verify(const X509_Certificate& cert,
TLS_Handshake_Hash& hash,
Version_Code version,
const SecureVector<byte>& master_secret)
{
std::auto_ptr<Public_Key> key(cert.subject_public_key());
std::string padding = "";
Signature_Format format = IEEE_1363;
if(key->algo_name() == "RSA")
{
padding = "EMSA3(TLS.Digest.0)";
}
else if(key->algo_name() == "DSA")
{
if(version == SSL_V3)
padding = "Raw";
else
padding = "EMSA1(SHA-1)";
format = DER_SEQUENCE;
}
else
throw Invalid_Argument(key->algo_name() +
" is invalid/unknown for TLS signatures");
PK_Verifier verifier(*key, padding, format);
if(version == SSL_V3)
{
SecureVector<byte> md5_sha = hash.final_ssl3(master_secret);
return verifier.verify_message(&md5_sha[16], md5_sha.size()-16,
&signature[0], signature.size());
}
else if(version == TLS_V10 || version == TLS_V11)
return verifier.verify_message(hash.get_contents(), signature);
else
throw TLS_Exception(PROTOCOL_VERSION,
"Unknown TLS version in certificate verification");
}
}
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