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/*
(C) 2007 FlexSecure GmbH
2008 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/cvc_self.h>
#include <botan/cvc_cert.h>
#include <botan/cvc_ca.h>
#include <botan/alg_id.h>
#include <botan/cvc_key.h>
#include <botan/oids.h>
#include <botan/look_pk.h>
#include <botan/cvc_req.h>
#include <botan/cvc_ado.h>
#include <botan/time.h>
#include <sstream>
namespace Botan {
namespace {
/*******************************
* cvc CHAT values
*******************************/
enum CHAT_values{
CVCA = 0xC0,
DVCA_domestic = 0x80,
DVCA_foreign = 0x40,
IS = 0x00,
IRIS = 0x02,
FINGERPRINT = 0x01
};
std::string padding_and_hash_from_oid(OID const& oid)
{
std::string padding_and_hash = OIDS::lookup(oid); // use the hash
assert(padding_and_hash.substr(0,6) == "ECDSA/"); // can only be ECDSA for now
assert(padding_and_hash.find("/",0) == 5);
padding_and_hash.erase(0, padding_and_hash.find("/",0) + 1);
return padding_and_hash;
}
std::string fixed_len_seqnr(u32bit seqnr, u32bit len)
{
std::stringstream ss;
std::string result;
ss << seqnr;
ss >> result;
if (result.size() > len)
{
throw Invalid_Argument("fixed_len_seqnr(): number too high to be encoded in provided length");
}
while (result.size() < len)
{
result.insert(0,"0");
}
return result;
}
}
namespace CVC_EAC
{
EAC1_1_CVC create_self_signed_cert(Private_Key const& key,
EAC1_1_CVC_Options const& opt,
RandomNumberGenerator& rng)
{
// NOTE: we ignore
// the value
// of opt.chr
ECDSA_PrivateKey const* priv_key = dynamic_cast<ECDSA_PrivateKey const*>(&key);
if (priv_key == 0)
{
throw Invalid_Argument("CVC_EAC::create_self_signed_cert(): unsupported key type");
}
ASN1_Chr chr(opt.car.value());
AlgorithmIdentifier sig_algo;
std::string padding_and_hash(eac_cvc_emsa + "(" + opt.hash_alg + ")");
sig_algo.oid = OIDS::lookup(priv_key->algo_name() + "/" + padding_and_hash);
sig_algo = AlgorithmIdentifier(sig_algo.oid, AlgorithmIdentifier::USE_NULL_PARAM);
std::auto_ptr<Botan::PK_Signer> signer(get_pk_signer(*priv_key, padding_and_hash));
#if 0 // FIXME
std::auto_ptr<EAC1_1_CVC_Encoder> enc(priv_key->cvc_eac1_1_encoder());
MemoryVector<byte> enc_public_key = enc->public_key(sig_algo);
#else
MemoryVector<byte> enc_public_key;
#endif
return EAC1_1_CVC_CA::make_cert(signer, enc_public_key, opt.car, chr, opt.holder_auth_templ, opt.ced, opt.cex, rng);
}
EAC1_1_Req create_cvc_req(Private_Key const& key,
ASN1_Chr const& chr,
std::string const& hash_alg,
RandomNumberGenerator& rng)
{
ECDSA_PrivateKey const* priv_key = dynamic_cast<ECDSA_PrivateKey const*>(&key);
if (priv_key == 0)
{
throw Invalid_Argument("CVC_EAC::create_self_signed_cert(): unsupported key type");
}
AlgorithmIdentifier sig_algo;
std::string padding_and_hash(eac_cvc_emsa + "(" + hash_alg + ")");
sig_algo.oid = OIDS::lookup(priv_key->algo_name() + "/" + padding_and_hash);
sig_algo = AlgorithmIdentifier(sig_algo.oid, AlgorithmIdentifier::USE_NULL_PARAM);
std::auto_ptr<Botan::PK_Signer> signer(get_pk_signer(*priv_key, padding_and_hash));
#if 0 // FIXME
std::auto_ptr<EAC1_1_CVC_Encoder> enc(priv_key->cvc_eac1_1_encoder());
MemoryVector<byte> enc_public_key = enc->public_key(sig_algo);
#else
MemoryVector<byte> enc_public_key;
#endif
MemoryVector<byte> enc_cpi;
enc_cpi.append(0x00);
MemoryVector<byte> tbs = DER_Encoder()
.encode(enc_cpi, OCTET_STRING, ASN1_Tag(41), APPLICATION)
.raw_bytes(enc_public_key)
.encode(chr)
.get_contents();
MemoryVector<byte> signed_cert = EAC1_1_gen_CVC<EAC1_1_Req>::make_signed(signer, EAC1_1_gen_CVC<EAC1_1_Req>::build_cert_body(tbs), rng);
std::tr1::shared_ptr<DataSource> source(new DataSource_Memory(signed_cert));
return EAC1_1_Req(source);
}
EAC1_1_ADO create_ado_req(Private_Key const& key,
EAC1_1_Req const& req,
ASN1_Car const& car,
RandomNumberGenerator& rng)
{
ECDSA_PrivateKey const* priv_key = dynamic_cast<ECDSA_PrivateKey const*>(&key);
if (priv_key == 0)
{
throw Invalid_Argument("CVC_EAC::create_self_signed_cert(): unsupported key type");
}
std::string padding_and_hash = padding_and_hash_from_oid(req.signature_algorithm().oid);
std::auto_ptr<Botan::PK_Signer> signer(get_pk_signer(*priv_key, padding_and_hash));
SecureVector<byte> tbs_bits = req.BER_encode();
tbs_bits.append(DER_Encoder().encode(car).get_contents());
MemoryVector<byte> signed_cert = EAC1_1_ADO::make_signed(signer, tbs_bits, rng);
std::tr1::shared_ptr<DataSource> source(new DataSource_Memory(signed_cert));
return EAC1_1_ADO(source);
}
} // namespace CVC_EAC
namespace DE_EAC
{
EAC1_1_CVC create_cvca(Private_Key const& key,
std::string const& hash,
ASN1_Car const& car, bool iris, bool fingerpr,
u32bit cvca_validity_months,
RandomNumberGenerator& rng)
{
ECDSA_PrivateKey const* priv_key = dynamic_cast<ECDSA_PrivateKey const*>(&key);
if (priv_key == 0)
{
throw Invalid_Argument("CVC_EAC::create_self_signed_cert(): unsupported key type");
}
EAC1_1_CVC_Options opts;
opts.car = car;
const u64bit current_time = system_time();
opts.ced = ASN1_Ced(current_time);
opts.cex = ASN1_Cex(opts.ced);
opts.cex.add_months(cvca_validity_months);
opts.holder_auth_templ = (CVCA | (iris * IRIS) | (fingerpr * FINGERPRINT));
opts.hash_alg = hash;
return Botan::CVC_EAC::create_self_signed_cert(*priv_key, opts, rng);
}
EAC1_1_CVC link_cvca(EAC1_1_CVC const& signer,
Private_Key const& key,
EAC1_1_CVC const& signee,
RandomNumberGenerator& rng)
{
ECDSA_PrivateKey const* priv_key = dynamic_cast<ECDSA_PrivateKey const*>(&key);
if (priv_key == 0)
{
throw Invalid_Argument("CVC_EAC::create_self_signed_cert(): unsupported key type");
}
ASN1_Ced ced(system_time());
ASN1_Cex cex(signee.get_cex());
if (*static_cast<EAC_Time*>(&ced) > *static_cast<EAC_Time*>(&cex))
{
std::string detail("link_cvca(): validity periods of provided certificates don't overlap: currend time = ced = ");
detail += ced.as_string();
detail += ", signee.cex = ";
detail += cex.as_string();
throw Invalid_Argument(detail);
}
if (signer.signature_algorithm() != signee.signature_algorithm())
{
throw Invalid_Argument("link_cvca(): signature algorithms of signer and signee don´t match");
}
AlgorithmIdentifier sig_algo = signer.signature_algorithm();
std::string padding_and_hash = padding_and_hash_from_oid(sig_algo.oid);
std::auto_ptr<Botan::PK_Signer> pk_signer(get_pk_signer(*priv_key, padding_and_hash));
std::auto_ptr<Public_Key> pk = signee.subject_public_key();
ECDSA_PublicKey* subj_pk = dynamic_cast<ECDSA_PublicKey*>(pk.get());
subj_pk->set_parameter_encoding(ENC_EXPLICIT);
#if 0 // FIXME
std::auto_ptr<EAC1_1_CVC_Encoder> enc(subj_pk->cvc_eac1_1_encoder());
MemoryVector<byte> enc_public_key = enc->public_key(sig_algo);
#else
MemoryVector<byte> enc_public_key;
#endif
return EAC1_1_CVC_CA::make_cert(pk_signer, enc_public_key,
signer.get_car(),
signee.get_chr(),
signer.get_chat_value(),
ced,
cex,
rng);
}
EAC1_1_CVC sign_request(EAC1_1_CVC const& signer_cert,
Private_Key const& key,
EAC1_1_Req const& signee,
u32bit seqnr,
u32bit seqnr_len,
bool domestic,
u32bit dvca_validity_months,
u32bit ca_is_validity_months,
RandomNumberGenerator& rng)
{
ECDSA_PrivateKey const* priv_key = dynamic_cast<ECDSA_PrivateKey const*>(&key);
if (priv_key == 0)
{
throw Invalid_Argument("CVC_EAC::create_self_signed_cert(): unsupported key type");
}
std::string chr_str = signee.get_chr().value();
chr_str.append(fixed_len_seqnr(seqnr, seqnr_len));
ASN1_Chr chr(chr_str);
std::string padding_and_hash = padding_and_hash_from_oid(signee.signature_algorithm().oid);
std::auto_ptr<Botan::PK_Signer> pk_signer(get_pk_signer(*priv_key, padding_and_hash));
std::auto_ptr<Public_Key> pk = signee.subject_public_key();
ECDSA_PublicKey* subj_pk = dynamic_cast<ECDSA_PublicKey*>(pk.get());
std::auto_ptr<Public_Key> signer_pk = signer_cert.subject_public_key();
// for the case that the domain parameters are not set...
// (we use those from the signer because they must fit)
subj_pk->set_domain_parameters(priv_key->domain_parameters());
subj_pk->set_parameter_encoding(ENC_IMPLICITCA);
#if 0 // FIXME
std::auto_ptr<EAC1_1_CVC_Encoder> enc(subj_pk->cvc_eac1_1_encoder());
MemoryVector<byte> enc_public_key = enc->public_key(sig_algo);
#else
MemoryVector<byte> enc_public_key;
#endif
AlgorithmIdentifier sig_algo(signer_cert.signature_algorithm());
const u64bit current_time = system_time();
ASN1_Ced ced(current_time);
u32bit chat_val;
u32bit chat_low = signer_cert.get_chat_value() & 0x3; // take the chat rights from signer
ASN1_Cex cex(ced);
if ((signer_cert.get_chat_value() & CVCA) == CVCA)
{
// we sign a dvca
cex.add_months(dvca_validity_months);
if (domestic)
{
chat_val = DVCA_domestic | chat_low;
}
else
{
chat_val = DVCA_foreign | chat_low;
}
}
else if ((signer_cert.get_chat_value() & DVCA_domestic) == DVCA_domestic ||
(signer_cert.get_chat_value() & DVCA_foreign) == DVCA_foreign)
{
cex.add_months(ca_is_validity_months);
chat_val = IS | chat_low;
}
else
{
throw Invalid_Argument("sign_request(): encountered illegal value for CHAT");
// (IS cannot sign certificates)
}
return EAC1_1_CVC_CA::make_cert(pk_signer, enc_public_key,
ASN1_Car(signer_cert.get_chr().iso_8859()),
chr,
chat_val,
ced,
cex,
rng);
}
EAC1_1_Req create_cvc_req(Private_Key const& prkey,
ASN1_Chr const& chr,
std::string const& hash_alg,
RandomNumberGenerator& rng)
{
ECDSA_PrivateKey const* priv_key = dynamic_cast<ECDSA_PrivateKey const*>(&prkey);
if (priv_key == 0)
{
throw Invalid_Argument("CVC_EAC::create_self_signed_cert(): unsupported key type");
}
ECDSA_PrivateKey key(*priv_key);
key.set_parameter_encoding(ENC_IMPLICITCA);
return Botan::CVC_EAC::create_cvc_req(key, chr, hash_alg, rng);
}
} // namespace DE_EAC
}
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