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/**
* Certificate Verify Message
* (C) 2004-2010 Jack Lloyd
*
* Released under the terms of the Botan license
*/
#include <botan/tls_messages.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,
HandshakeHash& hash,
const Private_Key* 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
*/
SecureVector<byte> Certificate_Verify::serialize() const
{
SecureVector<byte> buf;
u16bit sig_len = signature.size();
buf.append(get_byte(0, sig_len));
buf.append(get_byte(1, sig_len));
buf.append(signature);
return buf;
}
/**
* Deserialize a Certificate Verify message
*/
void Certificate_Verify::deserialize(const MemoryRegion<byte>& buf)
{
if(buf.size() < 2)
throw Decoding_Error("Certificate_Verify: Corrupted packet");
u32bit sig_len = make_u16bit(buf[0], buf[1]);
if(buf.size() != 2 + sig_len)
throw Decoding_Error("Certificate_Verify: Corrupted packet");
signature.set(buf + 2, sig_len);
}
/**
* Verify a Certificate Verify message
*/
bool Certificate_Verify::verify(const X509_Certificate& cert,
HandshakeHash& hash)
{
// FIXME: duplicate of Server_Key_Exchange::verify
std::unique_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")
{
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);
return verifier.verify_message(hash.final(), signature);
}
}
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