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/*
* OCSP
* (C) 2012 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/ocsp.h>
#include <botan/der_enc.h>
#include <botan/ber_dec.h>
#include <botan/x509_ext.h>
#include <botan/base64.h>
#include <iostream>
#include <botan/hex.h>
namespace Botan {
namespace OCSP {
namespace {
void decode_optional_list(BER_Decoder& ber,
ASN1_Tag tag,
std::vector<X509_Certificate>& output)
{
BER_Object obj = ber.get_next_object();
if(obj.type_tag != tag || obj.class_tag != (CONTEXT_SPECIFIC | CONSTRUCTED))
{
ber.push_back(obj);
return;
}
BER_Decoder list(obj.value);
while(list.more_items())
{
BER_Object certbits = list.get_next_object();
X509_Certificate cert(unlock(certbits.value));
output.push_back(std::move(cert));
}
}
}
std::vector<byte> Request::BER_encode() const
{
CertID certid(m_issuer, m_subject);
return DER_Encoder().start_cons(SEQUENCE)
.start_cons(SEQUENCE)
.start_explicit(0)
.encode(static_cast<size_t>(0)) // version #
.end_explicit()
.start_cons(SEQUENCE)
.start_cons(SEQUENCE)
.encode(certid)
.end_cons()
.end_cons()
.end_cons()
.end_cons().get_contents_unlocked();
}
std::string Request::base64_encode() const
{
return Botan::base64_encode(BER_encode());
}
Response::Response(const std::vector<byte>& response_bits)
{
BER_Decoder ber(response_bits);
BER_Decoder response_outer = ber.start_cons(SEQUENCE);
size_t resp_status = 0;
response_outer.decode(resp_status, ENUMERATED, UNIVERSAL);
if(response_outer.more_items())
{
BER_Decoder response_bytes =
response_outer.start_cons(ASN1_Tag(0), CONTEXT_SPECIFIC).start_cons(SEQUENCE);
response_bytes.decode_and_check(OID("1.3.6.1.5.5.7.48.1.1"),
"Unknown response OID in OCSP response");
std::vector<byte> response_vec;
response_bytes.decode(response_vec, OCTET_STRING);
BER_Decoder basicresponse_x(response_vec);
BER_Decoder basicresponse = basicresponse_x.start_cons(SEQUENCE);
BER_Decoder tbs_response = basicresponse.start_cons(SEQUENCE);
AlgorithmIdentifier sig_algo;
std::vector<byte> signature;
basicresponse.decode(sig_algo);
basicresponse.decode(signature, BIT_STRING);
std::vector<X509_Certificate> certs;
decode_optional_list(basicresponse, ASN1_Tag(0), certs);
size_t responsedata_version = 0;
X509_DN name;
std::vector<byte> key_hash;
X509_Time produced_at;
// decode_optional_and_check(0, ASN1_Tag(0), ASN1_Tag(CONSTRUCTED | CONTEXT_SPECIFIC));
tbs_response.decode_optional(responsedata_version, ASN1_Tag(0),
ASN1_Tag(CONSTRUCTED | CONTEXT_SPECIFIC));
// Technically a choice: enforce that?
tbs_response.decode_optional(name, ASN1_Tag(1),
ASN1_Tag(CONSTRUCTED | CONTEXT_SPECIFIC));
tbs_response.decode_optional_string(key_hash, ASN1_Tag(2),
ASN1_Tag(CONSTRUCTED | CONTEXT_SPECIFIC));
tbs_response.decode(produced_at);
tbs_response.decode_list(m_responses);
Extensions extensions;
tbs_response.decode_optional(extensions, ASN1_Tag(1),
ASN1_Tag(CONSTRUCTED | CONTEXT_SPECIFIC));
}
response_outer.end_cons();
}
bool Response::affirmative_response_for(const Request& req)
{
for(auto response : m_responses)
if(response.affirmative_response_for(req.issuer(), req.subject()))
return true;
return false;
}
}
}
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