/*
* Create a new self-signed X.509 certificate
*/
X509_Certificate create_self_signed_cert(const X509_Cert_Options& opts,
const Private_Key& key,
const std::string& hash_fn,
RandomNumberGenerator& rng)
{
AlgorithmIdentifier sig_algo;
X509_DN subject_dn;
AlternativeName subject_alt;
std::vector<byte> pub_key = X509::BER_encode(key);
std::unique_ptr<PK_Signer> signer(choose_sig_format(key, hash_fn, sig_algo));
load_info(opts, subject_dn, subject_alt);
Key_Constraints constraints;
if(opts.is_CA)
{
constraints = Key_Constraints(KEY_CERT_SIGN | CRL_SIGN);
}
else
{
verify_cert_constraints_valid_for_key_type(key, opts.constraints);
constraints = opts.constraints;
}
Extensions extensions;
extensions.add(
new Cert_Extension::Basic_Constraints(opts.is_CA, opts.path_limit),
true);
if(constraints != NO_CONSTRAINTS)
{
extensions.add(new Cert_Extension::Key_Usage(constraints), true);
}
extensions.add(new Cert_Extension::Subject_Key_ID(pub_key));
extensions.add(
new Cert_Extension::Subject_Alternative_Name(subject_alt));
extensions.add(
new Cert_Extension::Extended_Key_Usage(opts.ex_constraints));
return X509_CA::make_cert(signer.get(), rng, sig_algo, pub_key,
opts.start, opts.end,
subject_dn, subject_dn,
extensions);
}
/*
* Create a CRL
*/
X509_CRL X509_CA::make_crl(const std::vector<CRL_Entry>& revoked,
u32bit crl_number, u32bit next_update,
RandomNumberGenerator& rng) const
{
const size_t X509_CRL_VERSION = 2;
if(next_update == 0)
next_update = timespec_to_u32bit("7d");
// Totally stupid: ties encoding logic to the return of std::time!!
auto current_time = std::chrono::system_clock::now();
auto expire_time = current_time + std::chrono::seconds(next_update);
Extensions extensions;
extensions.add(
new Cert_Extension::Authority_Key_ID(m_cert.subject_key_id()));
extensions.add(new Cert_Extension::CRL_Number(crl_number));
// clang-format off
const std::vector<byte> crl = X509_Object::make_signed(
m_signer, rng, m_ca_sig_algo,
DER_Encoder().start_cons(SEQUENCE)
.encode(X509_CRL_VERSION-1)
.encode(m_ca_sig_algo)
.encode(m_cert.issuer_dn())
.encode(X509_Time(current_time))
.encode(X509_Time(expire_time))
.encode_if(revoked.size() > 0,
DER_Encoder()
.start_cons(SEQUENCE)
.encode_list(revoked)
.end_cons()
)
.start_explicit(0)
.start_cons(SEQUENCE)
.encode(extensions)
.end_cons()
.end_explicit()
.end_cons()
.get_contents());
// clang-format on
return X509_CRL(crl);
}
/*
* DER encode a CRL_Entry
*/
void CRL_Entry::encode_into(DER_Encoder& der) const
{
Extensions extensions;
extensions.add(new Cert_Extension::CRL_ReasonCode(reason));
der.start_cons(SEQUENCE)
.encode(BigInt::decode(serial, serial.size()))
.encode(time)
.encode(extensions)
.end_cons();
}
/*
* Sign a PKCS #10 certificate request
*/
X509_Certificate X509_CA::sign_request(const PKCS10_Request& req,
RandomNumberGenerator& rng,
const X509_Time& not_before,
const X509_Time& not_after)
{
Key_Constraints constraints;
if(req.is_CA())
constraints = Key_Constraints(KEY_CERT_SIGN | CRL_SIGN);
else
{
std::unique_ptr<Public_Key> key(req.subject_public_key());
constraints = find_constraints(*key, req.constraints());
}
Extensions extensions;
extensions.add(
new Cert_Extension::Basic_Constraints(req.is_CA(), req.path_limit()),
true);
extensions.add(new Cert_Extension::Key_Usage(constraints), true);
extensions.add(new Cert_Extension::Authority_Key_ID(m_cert.subject_key_id()));
extensions.add(new Cert_Extension::Subject_Key_ID(req.raw_public_key()));
extensions.add(
new Cert_Extension::Subject_Alternative_Name(req.subject_alt_name()));
extensions.add(
new Cert_Extension::Extended_Key_Usage(req.ex_constraints()));
return make_cert(m_signer, rng, m_ca_sig_algo,
req.raw_public_key(),
not_before, not_after,
m_cert.subject_dn(), req.subject_dn(),
extensions);
}
/*
* Create a PKCS #10 certificate request
*/
PKCS10_Request create_cert_req(const X509_Cert_Options& opts,
const Private_Key& key,
const std::string& hash_fn,
RandomNumberGenerator& rng)
{
AlgorithmIdentifier sig_algo;
X509_DN subject_dn;
AlternativeName subject_alt;
opts.sanity_check();
std::vector<byte> pub_key = X509::BER_encode(key);
std::unique_ptr<PK_Signer> signer(choose_sig_format(key, hash_fn, sig_algo));
load_info(opts, subject_dn, subject_alt);
const size_t PKCS10_VERSION = 0;
Extensions extensions;
extensions.add(
new Cert_Extension::Basic_Constraints(opts.is_CA, opts.path_limit));
extensions.add(
new Cert_Extension::Key_Usage(
opts.is_CA ? Key_Constraints(KEY_CERT_SIGN | CRL_SIGN) :
find_constraints(key, opts.constraints)
)
);
extensions.add(
new Cert_Extension::Extended_Key_Usage(opts.ex_constraints));
extensions.add(
new Cert_Extension::Subject_Alternative_Name(subject_alt));
DER_Encoder tbs_req;
tbs_req.start_cons(SEQUENCE)
.encode(PKCS10_VERSION)
.encode(subject_dn)
.raw_bytes(pub_key)
.start_explicit(0);
if(opts.challenge != "")
{
ASN1_String challenge(opts.challenge, DIRECTORY_STRING);
tbs_req.encode(
Attribute("PKCS9.ChallengePassword",
DER_Encoder().encode(challenge).get_contents_unlocked()
)
);
}
tbs_req.encode(
Attribute("PKCS9.ExtensionRequest",
DER_Encoder()
.start_cons(SEQUENCE)
.encode(extensions)
.end_cons()
.get_contents_unlocked()
)
)
.end_explicit()
.end_cons();
const std::vector<byte> req =
X509_Object::make_signed(signer.get(), rng, sig_algo,
tbs_req.get_contents());
return PKCS10_Request(req);
}
