AlgorithmIdentifier PSSR::config_for_x509(const Private_Key& key,
const std::string& cert_hash_name) const
{
if(cert_hash_name != m_hash->name())
throw Invalid_Argument("Hash function from opts and hash_fn argument"
" need to be identical");
// check that the signature algorithm and the padding scheme fit
if(!sig_algo_and_pad_ok(key.algo_name(), "EMSA4"))
{
throw Invalid_Argument("Encoding scheme with canonical name EMSA4"
" not supported for signature algorithm " + key.algo_name());
}
AlgorithmIdentifier sig_algo;
// hardcoded as RSA is the only valid algorithm for EMSA4 at the moment
sig_algo.oid = OIDS::lookup( "RSA/EMSA4" );
const AlgorithmIdentifier hash_id(cert_hash_name, AlgorithmIdentifier::USE_NULL_PARAM);
const AlgorithmIdentifier mgf_id("MGF1", hash_id.BER_encode());
DER_Encoder(sig_algo.parameters)
.start_cons(SEQUENCE)
.start_cons(ASN1_Tag(0), CONTEXT_SPECIFIC).encode(hash_id).end_cons()
.start_cons(ASN1_Tag(1), CONTEXT_SPECIFIC).encode(mgf_id).end_cons()
.start_cons(ASN1_Tag(2), CONTEXT_SPECIFIC).encode(m_SALT_SIZE).end_cons()
.start_cons(ASN1_Tag(3), CONTEXT_SPECIFIC).encode(size_t(1)).end_cons() // trailer field
.end_cons();
return sig_algo;
}
void EAC1_1_ADO::decode_info(DataSource& source,
SecureVector<byte> & res_tbs_bits,
ECDSA_Signature & res_sig)
{
SecureVector<byte> concat_sig;
SecureVector<byte> cert_inner_bits;
ASN1_Car car;
BER_Decoder(source)
.start_cons(ASN1_Tag(7))
.start_cons(ASN1_Tag(33))
.raw_bytes(cert_inner_bits)
.end_cons()
.decode(car)
.decode(concat_sig, OCTET_STRING, ASN1_Tag(55), APPLICATION)
.end_cons();
SecureVector<byte> enc_cert = DER_Encoder()
.start_cons(ASN1_Tag(33), APPLICATION)
.raw_bytes(cert_inner_bits)
.end_cons()
.get_contents();
res_tbs_bits = enc_cert;
res_tbs_bits += DER_Encoder().encode(car).get_contents();
res_sig = decode_concatenation(concat_sig);
}
MemoryVector<byte> EAC1_1_ADO::make_signed(PK_Signer& signer,
const MemoryRegion<byte>& tbs_bits,
RandomNumberGenerator& rng)
{
SecureVector<byte> concat_sig = signer.sign_message(tbs_bits, rng);
return DER_Encoder()
.start_cons(ASN1_Tag(7), APPLICATION)
.raw_bytes(tbs_bits)
.encode(concat_sig, OCTET_STRING, ASN1_Tag(55), APPLICATION)
.end_cons()
.get_contents();
}
Response::Response(const uint8_t response_bits[], size_t response_bits_len) :
m_response_bits(response_bits, response_bits + response_bits_len)
{
m_dummy_response_status = Certificate_Status_Code::OCSP_RESPONSE_INVALID;
BER_Decoder response_outer = BER_Decoder(m_response_bits).start_cons(SEQUENCE);
size_t resp_status = 0;
response_outer.decode(resp_status, ENUMERATED, UNIVERSAL);
if(resp_status != 0)
throw Exception("OCSP response status " + std::to_string(resp_status));
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 type in OCSP response");
BER_Decoder basicresponse =
BER_Decoder(response_bytes.get_next_octet_string()).start_cons(SEQUENCE);
basicresponse.start_cons(SEQUENCE)
.raw_bytes(m_tbs_bits)
.end_cons()
.decode(m_sig_algo)
.decode(m_signature, BIT_STRING);
decode_optional_list(basicresponse, ASN1_Tag(0), m_certs);
size_t responsedata_version = 0;
Extensions extensions;
BER_Decoder(m_tbs_bits)
.decode_optional(responsedata_version, ASN1_Tag(0),
ASN1_Tag(CONSTRUCTED | CONTEXT_SPECIFIC))
.decode_optional(m_signer_name, ASN1_Tag(1),
ASN1_Tag(CONSTRUCTED | CONTEXT_SPECIFIC))
.decode_optional_string(m_key_hash, OCTET_STRING, 2,
ASN1_Tag(CONSTRUCTED | CONTEXT_SPECIFIC))
.decode(m_produced_at)
.decode_list(m_responses)
.decode_optional(extensions, ASN1_Tag(1),
ASN1_Tag(CONSTRUCTED | CONTEXT_SPECIFIC));
}
response_outer.end_cons();
}
void EAC1_1_ADO::encode(Pipe& out, X509_Encoding encoding) const
{
if(encoding == PEM)
throw Invalid_Argument("EAC1_1_ADO::encode() cannot PEM encode an EAC object");
SecureVector<byte> concat_sig(
EAC1_1_obj<EAC1_1_ADO>::m_sig.get_concatenation());
out.write(DER_Encoder()
.start_cons(ASN1_Tag(7), APPLICATION)
.raw_bytes(tbs_bits)
.encode(concat_sig, OCTET_STRING, ASN1_Tag(55), APPLICATION)
.end_cons()
.get_contents());
}
EC_PrivateKey::EC_PrivateKey(const AlgorithmIdentifier& alg_id,
const secure_vector<byte>& key_bits)
{
m_domain_params = EC_Group(alg_id.parameters);
m_domain_encoding = EC_DOMPAR_ENC_EXPLICIT;
OID key_parameters;
secure_vector<byte> public_key_bits;
BER_Decoder(key_bits)
.start_cons(SEQUENCE)
.decode_and_check<size_t>(1, "Unknown version code for ECC key")
.decode_octet_string_bigint(m_private_key)
.decode_optional(key_parameters, ASN1_Tag(0), PRIVATE)
.decode_optional_string(public_key_bits, BIT_STRING, 1, PRIVATE)
.end_cons();
if(!key_parameters.empty() && key_parameters != alg_id.oid)
throw Decoding_Error("EC_PrivateKey - inner and outer OIDs did not match");
if(public_key_bits.empty())
{
m_public_key = domain().get_base_point() * m_private_key;
BOTAN_ASSERT(m_public_key.on_the_curve(),
"Public point derived from loaded key was on the curve");
}
else
{
m_public_key = OS2ECP(public_key_bits, domain().get_curve());
// OS2ECP verifies that the point is on the curve
}
}
void SingleResponse::decode_from(class BER_Decoder& from)
{
BER_Object cert_status;
Extensions extensions;
from.start_cons(SEQUENCE)
.decode(m_certid)
.get_next(cert_status)
.decode(m_thisupdate)
.decode_optional(m_nextupdate, ASN1_Tag(0),
ASN1_Tag(CONTEXT_SPECIFIC | CONSTRUCTED))
.decode_optional(extensions,
ASN1_Tag(1),
ASN1_Tag(CONTEXT_SPECIFIC | CONSTRUCTED))
.end_cons();
m_cert_status = cert_status.type_tag;
}
/*
* Decode the TBSCertificate data
*/
void EAC1_1_CVC::force_decode()
{
SecureVector<byte> enc_pk;
SecureVector<byte> enc_chat_val;
u32bit cpi;
BER_Decoder tbs_cert(tbs_bits);
tbs_cert.decode(cpi, ASN1_Tag(41), APPLICATION)
.decode(m_car)
.start_cons(ASN1_Tag(73))
.raw_bytes(enc_pk)
.end_cons()
.decode(m_chr)
.start_cons(ASN1_Tag(76))
.decode(m_chat_oid)
.decode(enc_chat_val, OCTET_STRING, ASN1_Tag(19), APPLICATION)
.end_cons()
.decode(m_ced)
.decode(m_cex)
.verify_end();
if(enc_chat_val.size() != 1)
throw Decoding_Error("CertificateHolderAuthorizationValue was not of length 1");
if(cpi != 0)
throw Decoding_Error("EAC1_1 certificate´s cpi was not 0");
// FIXME: PK algos have no notion of EAC encoder/decoder currently
#if 0
ECDSA_PublicKey tmp_pk;
std::auto_ptr<EAC1_1_CVC_Decoder> dec = tmp_pk.cvc_eac1_1_decoder();
sig_algo = dec->public_key(enc_pk);
m_pk = tmp_pk;
m_chat_val = enc_chat_val[0];
self_signed = false;
if(m_car.iso_8859() == m_chr.iso_8859())
{
self_signed= true;
}
#endif
}
void EAC1_1_ADO::force_decode()
{
SecureVector<byte> inner_cert;
BER_Decoder(tbs_bits)
.start_cons(ASN1_Tag(33))
.raw_bytes(inner_cert)
.end_cons()
.decode(m_car)
.verify_end();
SecureVector<byte> req_bits = DER_Encoder()
.start_cons(ASN1_Tag(33), APPLICATION)
.raw_bytes(inner_cert)
.end_cons()
.get_contents();
DataSource_Memory req_source(req_bits);
m_req = EAC1_1_Req(req_source);
sig_algo = m_req.sig_algo;
}
void GeneralSubtree::decode_from(class BER_Decoder& ber)
{
ber.start_cons(SEQUENCE)
.decode(m_base)
.decode_optional(m_minimum,ASN1_Tag(0),CONTEXT_SPECIFIC,size_t(0))
.end_cons();
if(m_minimum != 0)
throw Decoding_Error("GeneralSubtree minimum must be 0");
m_maximum = std::numeric_limits<std::size_t>::max();
}
/*
* Deocde the CertificateRequestInfo
*/
void PKCS10_Request::force_decode()
{
BER_Decoder cert_req_info(m_tbs_bits);
size_t version;
cert_req_info.decode(version);
if(version != 0)
throw Decoding_Error("Unknown version code in PKCS #10 request: " +
std::to_string(version));
X509_DN dn_subject;
cert_req_info.decode(dn_subject);
m_info.add(dn_subject.contents());
BER_Object public_key = cert_req_info.get_next_object();
if(public_key.type_tag != SEQUENCE || public_key.class_tag != CONSTRUCTED)
throw BER_Bad_Tag("PKCS10_Request: Unexpected tag for public key",
public_key.type_tag, public_key.class_tag);
m_info.add("X509.Certificate.public_key",
PEM_Code::encode(
ASN1::put_in_sequence(unlock(public_key.value)),
"PUBLIC KEY"
)
);
BER_Object attr_bits = cert_req_info.get_next_object();
if(attr_bits.type_tag == 0 &&
attr_bits.class_tag == ASN1_Tag(CONSTRUCTED | CONTEXT_SPECIFIC))
{
BER_Decoder attributes(attr_bits.value);
while(attributes.more_items())
{
Attribute attr;
attributes.decode(attr);
handle_attribute(attr);
}
attributes.verify_end();
}
else if(attr_bits.type_tag != NO_OBJECT)
throw BER_Bad_Tag("PKCS10_Request: Unexpected tag for attributes",
attr_bits.type_tag, attr_bits.class_tag);
cert_req_info.verify_end();
if(!this->check_signature(subject_public_key()))
throw Decoding_Error("PKCS #10 request: Bad signature detected");
}
EAC1_1_CVC EAC1_1_CVC_CA::make_cert(std::auto_ptr<PK_Signer> signer,
MemoryRegion<byte> const& public_key,
ASN1_Car const& car,
ASN1_Chr const& chr,
byte holder_auth_templ,
ASN1_Ced ced,
ASN1_Cex cex,
RandomNumberGenerator& rng)
{
OID chat_oid(OIDS::lookup("CertificateHolderAuthorizationTemplate"));
MemoryVector<byte> enc_chat_val;
enc_chat_val.append(holder_auth_templ);
MemoryVector<byte> enc_cpi;
enc_cpi.append(0x00);
MemoryVector<byte> tbs = DER_Encoder()
.encode(enc_cpi, OCTET_STRING, ASN1_Tag(41), APPLICATION) // cpi
.encode(car)
.raw_bytes(public_key)
.encode(chr)
.start_cons(ASN1_Tag(76), APPLICATION)
.encode(chat_oid)
.encode(enc_chat_val, OCTET_STRING, ASN1_Tag(19), APPLICATION)
.end_cons()
.encode(ced)
.encode(cex)
.get_contents();
MemoryVector<byte> signed_cert =
EAC1_1_CVC::make_signed(signer,
EAC1_1_CVC::build_cert_body(tbs),
rng);
SharedPointer<DataSource> source(new DataSource_Memory(signed_cert));
return EAC1_1_CVC(source);
}
void EAC1_1_Req::force_decode()
{
SecureVector<byte> enc_pk;
BER_Decoder tbs_cert(tbs_bits);
u32bit cpi;
tbs_cert.decode(cpi, ASN1_Tag(41), APPLICATION)
.start_cons(ASN1_Tag(73))
.raw_bytes(enc_pk)
.end_cons()
.decode(m_chr)
.verify_end();
if(cpi != 0)
{
throw Decoding_Error("EAC1_1 request´s cpi was not 0");
}
// FIXME: No EAC support in ECDSA
#if 0
ECDSA_PublicKey tmp_pk;
std::auto_ptr<EAC1_1_CVC_Decoder> dec = tmp_pk.cvc_eac1_1_decoder();
sig_algo = dec->public_key(enc_pk);
m_pk = tmp_pk;
#endif
}
Response::Response(const Certificate_Store& trusted_roots,
const std::vector<byte>& response_bits)
{
BER_Decoder response_outer = BER_Decoder(response_bits).start_cons(SEQUENCE);
size_t resp_status = 0;
response_outer.decode(resp_status, ENUMERATED, UNIVERSAL);
if(resp_status != 0)
throw std::runtime_error("OCSP response status " + std::to_string(resp_status));
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 type in OCSP response");
BER_Decoder basicresponse =
BER_Decoder(response_bytes.get_next_octet_string()).start_cons(SEQUENCE);
std::vector<byte> tbs_bits;
AlgorithmIdentifier sig_algo;
std::vector<byte> signature;
std::vector<X509_Certificate> certs;
basicresponse.start_cons(SEQUENCE)
.raw_bytes(tbs_bits)
.end_cons()
.decode(sig_algo)
.decode(signature, BIT_STRING);
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;
Extensions extensions;
BER_Decoder(tbs_bits)
.decode_optional(responsedata_version, ASN1_Tag(0),
ASN1_Tag(CONSTRUCTED | CONTEXT_SPECIFIC))
.decode_optional(name, ASN1_Tag(1),
ASN1_Tag(CONSTRUCTED | CONTEXT_SPECIFIC))
.decode_optional_string(key_hash, OCTET_STRING, 2,
ASN1_Tag(CONSTRUCTED | CONTEXT_SPECIFIC))
.decode(produced_at)
.decode_list(m_responses)
.decode_optional(extensions, ASN1_Tag(1),
ASN1_Tag(CONSTRUCTED | CONTEXT_SPECIFIC));
if(certs.empty())
{
if(auto cert = trusted_roots.find_cert(name, std::vector<byte>()))
certs.push_back(*cert);
else
throw std::runtime_error("Could not find certificate that signed OCSP response");
}
check_signature(tbs_bits, sig_algo, signature, trusted_roots, certs);
}
response_outer.end_cons();
}
ASN1_Chr::ASN1_Chr(std::string const& str)
: ASN1_EAC_String(str, ASN1_Tag(32))
{}
ASN1_Car::ASN1_Car(std::string const& str)
: ASN1_EAC_String(str, ASN1_Tag(2))
{}
