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/*************************************************
* PKCS #10/Self Signed Cert Creation Source File *
* (C) 1999-2006 The Botan Project *
*************************************************/
#include <botan/x509self.h>
#include <botan/x509_ext.h>
#include <botan/x509_ca.h>
#include <botan/der_enc.h>
#include <botan/config.h>
#include <botan/look_pk.h>
#include <botan/oids.h>
#include <botan/pipe.h>
#include <memory>
namespace Botan {
namespace {
/*************************************************
* Shared setup for self-signed items *
*************************************************/
MemoryVector<byte> shared_setup(const X509_Cert_Options& opts,
const PKCS8_PrivateKey& key)
{
const PKCS8_PrivateKey* key_pointer = &key;
if(!dynamic_cast<const PK_Signing_Key*>(key_pointer))
throw Invalid_Argument("Key type " + key.algo_name() + " cannot sign");
opts.sanity_check();
Pipe key_encoder;
key_encoder.start_msg();
X509::encode(key, key_encoder, RAW_BER);
key_encoder.end_msg();
return key_encoder.read_all();
}
/*************************************************
* Load information from the X509_Cert_Options *
*************************************************/
void load_info(const X509_Cert_Options& opts, X509_DN& subject_dn,
AlternativeName& subject_alt)
{
subject_dn.add_attribute("X520.CommonName", opts.common_name);
subject_dn.add_attribute("X520.Country", opts.country);
subject_dn.add_attribute("X520.State", opts.state);
subject_dn.add_attribute("X520.Locality", opts.locality);
subject_dn.add_attribute("X520.Organization", opts.organization);
subject_dn.add_attribute("X520.OrganizationalUnit", opts.org_unit);
subject_dn.add_attribute("X520.SerialNumber", opts.serial_number);
subject_alt = AlternativeName(opts.email, opts.uri, opts.dns);
subject_alt.add_othername(OIDS::lookup("PKIX.XMPPAddr"),
opts.xmpp, UTF8_STRING);
}
/*************************************************
* Choose a signing format for the key *
*************************************************/
PK_Signer* choose_sig_format(const PKCS8_PrivateKey& key,
AlgorithmIdentifier& sig_algo)
{
std::string padding;
Signature_Format format;
Config::choose_sig_format(key.algo_name(), padding, format);
sig_algo.oid = OIDS::lookup(key.algo_name() + "/" + padding);
sig_algo.parameters = key.DER_encode_params();
const PK_Signing_Key& sig_key = dynamic_cast<const PK_Signing_Key&>(key);
return get_pk_signer(sig_key, padding, format);
}
}
namespace X509 {
/*************************************************
* Create a new self-signed X.509 certificate *
*************************************************/
X509_Certificate create_self_signed_cert(const X509_Cert_Options& opts,
const PKCS8_PrivateKey& key)
{
AlgorithmIdentifier sig_algo;
X509_DN subject_dn;
AlternativeName subject_alt;
MemoryVector<byte> pub_key = shared_setup(opts, key);
std::auto_ptr<PK_Signer> signer(choose_sig_format(key, 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
constraints = find_constraints(key, opts.constraints);
Extensions extensions;
extensions.add(new Cert_Extension::Subject_Key_ID(pub_key));
extensions.add(new Cert_Extension::Key_Usage(constraints));
extensions.add(
new Cert_Extension::Extended_Key_Usage(opts.ex_constraints));
extensions.add(
new Cert_Extension::Subject_Alternative_Name(subject_alt));
extensions.add(
new Cert_Extension::Basic_Constraints(opts.is_CA, opts.path_limit));
return X509_CA::make_cert(signer.get(), sig_algo, pub_key,
opts.start, opts.end,
subject_dn, subject_dn,
extensions);
}
/*************************************************
* Create a PKCS #10 certificate request *
*************************************************/
PKCS10_Request create_cert_req(const X509_Cert_Options& opts,
const PKCS8_PrivateKey& key)
{
AlgorithmIdentifier sig_algo;
X509_DN subject_dn;
AlternativeName subject_alt;
MemoryVector<byte> pub_key = shared_setup(opts, key);
std::auto_ptr<PK_Signer> signer(choose_sig_format(key, sig_algo));
load_info(opts, subject_dn, subject_alt);
const u32bit 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()
)
);
}
tbs_req.encode(
Attribute("PKCS9.ExtensionRequest",
DER_Encoder()
.start_cons(SEQUENCE)
.encode(extensions)
.end_cons()
.get_contents()
)
)
.end_explicit()
.end_cons();
DataSource_Memory source(
X509_Object::make_signed(signer.get(), sig_algo,
tbs_req.get_contents())
);
return PKCS10_Request(source);
}
}
}
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