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/*
* X.509 SIGNED Object
* (C) 1999-2007 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/x509_obj.h>
#include <botan/pubkey.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>
namespace Botan {
/*
* Create a generic X.509 object
*/
X509_Object::X509_Object(DataSource& stream, const std::string& labels)
{
init(stream, labels);
}
#if defined(BOTAN_TARGET_OS_HAS_FILESYSTEM)
/*
* Create 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);
}
#endif
/*
* Create a generic X.509 object
*/
X509_Object::X509_Object(const std::vector<uint8_t>& vec, const std::string& labels)
{
DataSource_Memory stream(vec.data(), vec.size());
init(stream, labels);
}
/*
* Read a PEM or BER X.509 object
*/
void X509_Object::init(DataSource& in, const std::string& labels)
{
m_PEM_labels_allowed = split_on(labels, '/');
if(m_PEM_labels_allowed.size() < 1)
throw Invalid_Argument("Bad labels argument to X509_Object");
m_PEM_label_pref = m_PEM_labels_allowed[0];
std::sort(m_PEM_labels_allowed.begin(), m_PEM_labels_allowed.end());
try {
if(ASN1::maybe_BER(in) && !PEM_Code::matches(in))
{
BER_Decoder dec(in);
decode_from(dec);
}
else
{
std::string got_label;
DataSource_Memory ber(PEM_Code::decode(in, got_label));
if(!std::binary_search(m_PEM_labels_allowed.begin(),
m_PEM_labels_allowed.end(), got_label))
throw Decoding_Error("Invalid PEM label: " + got_label);
BER_Decoder dec(ber);
decode_from(dec);
}
}
catch(Decoding_Error& e)
{
throw Decoding_Error(m_PEM_label_pref + " decoding failed: " + e.what());
}
}
void X509_Object::encode_into(DER_Encoder& to) const
{
to.start_cons(SEQUENCE)
.start_cons(SEQUENCE)
.raw_bytes(signed_body())
.end_cons()
.encode(signature_algorithm())
.encode(signature(), BIT_STRING)
.end_cons();
}
/*
* Read a BER encoded X.509 object
*/
void X509_Object::decode_from(BER_Decoder& from)
{
from.start_cons(SEQUENCE)
.start_cons(SEQUENCE)
.raw_bytes(m_tbs_bits)
.end_cons()
.decode(m_sig_algo)
.decode(m_sig, BIT_STRING)
.end_cons();
}
/*
* Return a BER encoded X.509 object
*/
std::vector<uint8_t> X509_Object::BER_encode() const
{
DER_Encoder der;
encode_into(der);
return der.get_contents_unlocked();
}
/*
* Return a PEM encoded X.509 object
*/
std::string X509_Object::PEM_encode() const
{
return PEM_Code::encode(BER_encode(), m_PEM_label_pref);
}
/*
* Return the TBS data
*/
std::vector<uint8_t> X509_Object::tbs_data() const
{
return ASN1::put_in_sequence(m_tbs_bits);
}
/*
* Return the hash used in generating the signature
*/
std::string X509_Object::hash_used_for_signature() const
{
const OID oid = m_sig_algo.oid;
std::vector<std::string> sig_info = split_on(OIDS::lookup(oid), '/');
if(sig_info.size() != 2)
throw Internal_Error("Invalid name format found for " +
oid.as_string());
std::vector<std::string> pad_and_hash =
parse_algorithm_name(sig_info[1]);
if(pad_and_hash.size() != 2)
throw Internal_Error("Invalid name format " + sig_info[1]);
return pad_and_hash[1];
}
/*
* Check the signature on an object
*/
bool X509_Object::check_signature(const Public_Key* pub_key) const
{
if(!pub_key)
throw Exception("No key provided for " + m_PEM_label_pref + " signature check");
std::unique_ptr<const Public_Key> key(pub_key);
return check_signature(*key);
}
/*
* Check the signature on an object
*/
bool X509_Object::check_signature(const Public_Key& pub_key) const
{
try {
std::vector<std::string> sig_info =
split_on(OIDS::lookup(m_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;
PK_Verifier verifier(pub_key, padding, format);
return verifier.verify_message(tbs_data(), signature());
}
catch(std::exception&)
{
return false;
}
}
/*
* Apply the X.509 SIGNED macro
*/
std::vector<uint8_t> X509_Object::make_signed(PK_Signer* signer,
RandomNumberGenerator& rng,
const AlgorithmIdentifier& algo,
const secure_vector<uint8_t>& 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_unlocked();
}
/*
* Try to decode the actual information
*/
void X509_Object::do_decode()
{
try {
force_decode();
}
catch(Decoding_Error& e)
{
throw Decoding_Error(m_PEM_label_pref + " decoding failed (" +
e.what() + ")");
}
catch(Invalid_Argument& e)
{
throw Decoding_Error(m_PEM_label_pref + " decoding failed (" +
e.what() + ")");
}
}
}
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