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/*************************************************
* X.509 Certificate Extensions Source File *
* (C) 1999-2006 The Botan Project *
*************************************************/
#include <botan/x509_ext.h>
#include <botan/der_enc.h>
#include <botan/ber_dec.h>
#include <botan/x509cert.h>
#include <botan/lookup.h>
#include <botan/oids.h>
#include <botan/conf.h>
#include <botan/bit_ops.h>
#include <algorithm>
namespace Botan {
/*************************************************
* Encode a Certificate Extension *
*************************************************/
void Certificate_Extension::encode_into(DER_Encoder& der,
bool is_critical) const
{
if(should_encode())
{
#if 0
der.start_seqeuence()
.encode(oid_of())
.encode_optional(is_critical, false)
.encode(encode_inner(), OCTET_STRING)
.end_sequence();
#else
der.start_sequence();
der.encode(oid_of());
if(is_critical)
der.encode(is_critical);
der.encode(encode_inner(), OCTET_STRING);
der.end_sequence();
#endif
}
}
/*************************************************
* Decode a Certificate Extension *
*************************************************/
void Certificate_Extension::decode_from(BER_Decoder& ber)
{
MemoryVector<byte> value;
OID oid;
#if 0
ber.start_sequence()
.decode(oid)
.decode_optional(is_critical, false)
.decode(value, OCTET_STRING)
.end_sequence();
#else
BER_Decoder extension = BER::get_subsequence(ber);
BER::decode(extension, oid);
BER::decode_optional(extension, critical, BOOLEAN, UNIVERSAL, false);
extension.decode(value, OCTET_STRING);
extension.verify_end();
#endif
decode_inner(value);
}
/*************************************************
* Encode a Certificate Extension *
*************************************************/
void Certificate_Extension::encode_into(DER_Encoder& der) const
{
encode_into(der, critical);
}
/*************************************************
* Return the OID of this extension *
*************************************************/
OID Certificate_Extension::oid_of() const
{
return OIDS::lookup(oid_name());
}
/*************************************************
* Encode a Certificate Extension *
*************************************************/
void Certificate_Extension::maybe_add(class DER_Encoder& der) const
{
const std::string opt_name = "x509/exts/" + config_id();
std::string setting = Config::get_string(opt_name);
if(setting != "no")
encode_into(der, critical || (setting == "critical"));
}
/*************************************************
* Encode an Extensions list *
*************************************************/
void Extensions::encode_into(class DER_Encoder& to_object) const
{
for(u32bit j = 0; j != extensions.size(); ++j)
extensions[j]->maybe_add(to_object);
}
/*************************************************
* Delete an Extensions list *
*************************************************/
Extensions::~Extensions()
{
for(u32bit j = 0; j != extensions.size(); ++j)
delete extensions[j];
}
namespace Cert_Extension {
/*************************************************
* Encode the extension *
*************************************************/
MemoryVector<byte> Basic_Constraints::encode_inner() const
{
DER_Encoder der;
der.start_sequence();
if(is_ca)
{
der.encode(true);
if(path_limit != NO_CERT_PATH_LIMIT)
der.encode(path_limit);
}
der.end_sequence();
return der.get_contents();
}
/*************************************************
* Decode the extension *
*************************************************/
void Basic_Constraints::decode_inner(const MemoryRegion<byte>& in)
{
BER_Decoder ber(in);
BER_Decoder basic_constraints = BER::get_subsequence(ber);
BER::decode_optional(basic_constraints, is_ca,
BOOLEAN, UNIVERSAL, false);
BER::decode_optional(basic_constraints, path_limit,
INTEGER, UNIVERSAL, NO_CERT_PATH_LIMIT);
basic_constraints.verify_end();
}
/*************************************************
* Basic_Constraints Constructor *
*************************************************/
Basic_Constraints::Basic_Constraints(bool is_ca, u32bit path_limit)
{
this->is_ca = is_ca;
this->path_limit = path_limit;
}
/*************************************************
* Encode the extension *
*************************************************/
MemoryVector<byte> Key_Usage::encode_inner() const
{
if(constraints == NO_CONSTRAINTS)
throw Encoding_Error("Cannot encode zero usage constraints");
const u32bit unused_bits = low_bit(constraints) - 1;
SecureVector<byte> der;
der.append(BIT_STRING);
der.append(2 + ((unused_bits < 8) ? 1 : 0));
der.append(unused_bits % 8);
der.append((constraints >> 8) & 0xFF);
if(constraints & 0xFF)
der.append(constraints & 0xFF);
return der;
}
/*************************************************
* Decode the extension *
*************************************************/
void Key_Usage::decode_inner(const MemoryRegion<byte>& in)
{
BER_Decoder ber(in);
BER_Object obj = ber.get_next_object();
if(obj.type_tag != BIT_STRING || obj.class_tag != UNIVERSAL)
throw BER_Bad_Tag("Bad tag for usage constraint",
obj.type_tag, obj.class_tag);
if(obj.value.size() != 2 && obj.value.size() != 3)
throw BER_Decoding_Error("Bad size for BITSTRING in usage constraint");
if(obj.value[0] >= 8)
throw BER_Decoding_Error("Invalid unused bits in usage constraint");
obj.value[obj.value.size()-1] &= (0xFF << obj.value[0]);
u16bit usage = 0;
for(u32bit j = 1; j != obj.value.size(); ++j)
usage = (obj.value[j] << 8) | usage;
constraints = Key_Constraints(usage);
}
/*************************************************
* Key_Usage Constructor *
*************************************************/
Key_Usage::Key_Usage(Key_Constraints constraints)
{
this->constraints = constraints;
}
/*************************************************
* Encode the extension *
*************************************************/
MemoryVector<byte> Subject_Key_ID::encode_inner() const
{
return DER_Encoder().encode(key_id, OCTET_STRING).get_contents();
}
/*************************************************
* Decode the extension *
*************************************************/
void Subject_Key_ID::decode_inner(const MemoryRegion<byte>& in)
{
BER_Decoder(in).decode(key_id, OCTET_STRING).verify_end();
}
/*************************************************
* Subject_Key_ID Constructor *
*************************************************/
Subject_Key_ID::Subject_Key_ID(const MemoryRegion<byte>& pub_key)
{
std::auto_ptr<HashFunction> hash(get_hash("SHA-1"));
key_id = hash->process(pub_key);
}
/*************************************************
* Encode the extension *
*************************************************/
MemoryVector<byte> Authority_Key_ID::encode_inner() const
{
return DER_Encoder()
.start_sequence()
.encode(key_id, OCTET_STRING, ASN1_Tag(0), CONTEXT_SPECIFIC)
.end_sequence()
.get_contents();
}
/*************************************************
* Decode the extension *
*************************************************/
void Authority_Key_ID::decode_inner(const MemoryRegion<byte>& in)
{
BER_Decoder ber(in);
}
/*************************************************
* Authority_Key_ID Constructor *
*************************************************/
Authority_Key_ID::Authority_Key_ID(const MemoryRegion<byte>& key_id)
{
this->key_id = key_id;
}
/*************************************************
* Encode the extension *
*************************************************/
MemoryVector<byte> Alternative_Name::encode_inner() const
{
return DER_Encoder().encode(alt_name).get_contents();
}
/*************************************************
* Decode the extension *
*************************************************/
void Alternative_Name::decode_inner(const MemoryRegion<byte>& in)
{
BER_Decoder ber(in);
}
/*************************************************
* Alternative_Name Constructor *
*************************************************/
Alternative_Name::Alternative_Name(const AlternativeName& alt_name,
const std::string& oid_name_str,
const std::string& config_name_str)
{
this->alt_name = alt_name;
this->oid_name_str = oid_name_str;
this->config_name_str = config_name_str;
}
/*************************************************
* Encode the extension *
*************************************************/
MemoryVector<byte> Extended_Key_Usage::encode_inner() const
{
DER_Encoder der;
der.start_sequence();
for(u32bit j = 0; j != oids.size(); ++j)
der.encode(oids[j]);
der.end_sequence();
return der.get_contents();
}
/*************************************************
* Decode the extension *
*************************************************/
void Extended_Key_Usage::decode_inner(const MemoryRegion<byte>& in)
{
BER_Decoder ber(in);
}
/*************************************************
* Extended_Key_Usage Constructor *
*************************************************/
Extended_Key_Usage::Extended_Key_Usage(const std::vector<OID>& oids)
{
this->oids = oids;
}
/*************************************************
* Encode the extension *
*************************************************/
MemoryVector<byte> CRL_Number::encode_inner() const
{
return DER_Encoder().encode(crl_number).get_contents();
}
/*************************************************
* Decode the extension *
*************************************************/
void CRL_Number::decode_inner(const MemoryRegion<byte>& in)
{
BER_Decoder ber(in);
}
/*************************************************
* CRL_Number Constructor *
*************************************************/
CRL_Number::CRL_Number(u32bit n) : crl_number(n)
{
}
}
}
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