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/*
* X.509 SIGNED Object
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/x509_obj.h>
#include <botan/x509_key.h>
#include <botan/look_pk.h>
#include <botan/oids.h>
#include <botan/der_enc.h>
#include <botan/ber_dec.h>
#include <botan/parsing.h>
#include <botan/pem.h>
#include <algorithm>
#include <memory>
namespace Botan {
/*
* Create a generic X.509 object
*/
X509_Object::X509_Object(DataSource& stream, const std::string& labels)
{
init(stream, labels);
}
/*
* Createa a generic X.509 object
*/
X509_Object::X509_Object(const std::string& file, const std::string& labels)
{
DataSource_Stream stream(file, true);
init(stream, labels);
}
/*
* Read a PEM or BER X.509 object
*/
void X509_Object::init(DataSource& in, const std::string& labels)
{
PEM_labels_allowed = split_on(labels, '/');
if(PEM_labels_allowed.size() < 1)
throw Invalid_Argument("Bad labels argument to X509_Object");
PEM_label_pref = PEM_labels_allowed[0];
std::sort(PEM_labels_allowed.begin(), PEM_labels_allowed.end());
try {
if(ASN1::maybe_BER(in) && !PEM_Code::matches(in))
decode_info(in);
else
{
std::string got_label;
DataSource_Memory ber(PEM_Code::decode(in, got_label));
if(!std::binary_search(PEM_labels_allowed.begin(),
PEM_labels_allowed.end(), got_label))
throw Decoding_Error("Invalid PEM label: " + got_label);
decode_info(ber);
}
}
catch(Decoding_Error)
{
throw Decoding_Error(PEM_label_pref + " decoding failed");
}
}
/*
* Read a BER encoded X.509 object
*/
void X509_Object::decode_info(DataSource& source)
{
BER_Decoder(source)
.start_cons(SEQUENCE)
.start_cons(SEQUENCE)
.raw_bytes(tbs_bits)
.end_cons()
.decode(sig_algo)
.decode(sig, BIT_STRING)
.verify_end()
.end_cons();
}
/*
* Return a BER or PEM encoded X.509 object
*/
void X509_Object::encode(Pipe& out, X509_Encoding encoding) const
{
SecureVector<byte> der = DER_Encoder()
.start_cons(SEQUENCE)
.start_cons(SEQUENCE)
.raw_bytes(tbs_bits)
.end_cons()
.encode(sig_algo)
.encode(sig, BIT_STRING)
.end_cons()
.get_contents();
if(encoding == PEM)
out.write(PEM_Code::encode(der, PEM_label_pref));
else
out.write(der);
}
/*
* Return a BER encoded X.509 object
*/
SecureVector<byte> X509_Object::BER_encode() const
{
Pipe ber;
ber.start_msg();
encode(ber, RAW_BER);
ber.end_msg();
return ber.read_all();
}
/*
* Return a PEM encoded X.509 object
*/
std::string X509_Object::PEM_encode() const
{
Pipe pem;
pem.start_msg();
encode(pem, PEM);
pem.end_msg();
return pem.read_all_as_string();
}
/*
* Return the TBS data
*/
SecureVector<byte> X509_Object::tbs_data() const
{
return ASN1::put_in_sequence(tbs_bits);
}
/*
* Return the signature of this object
*/
SecureVector<byte> X509_Object::signature() const
{
return sig;
}
/*
* Return the algorithm used to sign this object
*/
AlgorithmIdentifier X509_Object::signature_algorithm() const
{
return sig_algo;
}
/*
* Check the signature on an object
*/
bool X509_Object::check_signature(Public_Key& pub_key) const
{
try {
std::vector<std::string> sig_info =
split_on(OIDS::lookup(sig_algo.oid), '/');
if(sig_info.size() != 2 || sig_info[0] != pub_key.algo_name())
return false;
std::string padding = sig_info[1];
Signature_Format format =
(pub_key.message_parts() >= 2) ? DER_SEQUENCE : IEEE_1363;
std::auto_ptr<PK_Verifier> verifier(
get_pk_verifier(pub_key, padding, format));
return verifier->verify_message(tbs_data(), signature());
}
catch(...)
{
return false;
}
}
/*
* Apply the X.509 SIGNED macro
*/
MemoryVector<byte> X509_Object::make_signed(PK_Signer* signer,
RandomNumberGenerator& rng,
const AlgorithmIdentifier& algo,
const MemoryRegion<byte>& tbs_bits)
{
return DER_Encoder()
.start_cons(SEQUENCE)
.raw_bytes(tbs_bits)
.encode(algo)
.encode(signer->sign_message(tbs_bits, rng), BIT_STRING)
.end_cons()
.get_contents();
}
/*
* Try to decode the actual information
*/
void X509_Object::do_decode()
{
try {
force_decode();
}
catch(Decoding_Error& e)
{
const std::string what = e.what();
throw Decoding_Error(PEM_label_pref + " decoding failed (" +
what.substr(23, std::string::npos) + ")");
}
catch(Invalid_Argument& e)
{
const std::string what = e.what();
throw Decoding_Error(PEM_label_pref + " decoding failed (" +
what.substr(7, std::string::npos) + ")");
}
}
}
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