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/*
* PKCS #8
* (C) 1999-2010 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/pkcs8.h>
#include <botan/get_pbe.h>
#include <botan/der_enc.h>
#include <botan/ber_dec.h>
#include <botan/asn1_obj.h>
#include <botan/oids.h>
#include <botan/pem.h>
#include <botan/internal/pk_algs.h>
#include <memory>
namespace Botan {
namespace PKCS8 {
namespace {
/*
* Get info from an EncryptedPrivateKeyInfo
*/
SecureVector<byte> PKCS8_extract(DataSource& source,
AlgorithmIdentifier& pbe_alg_id)
{
SecureVector<byte> key_data;
BER_Decoder(source)
.start_cons(SEQUENCE)
.decode(pbe_alg_id)
.decode(key_data, OCTET_STRING)
.verify_end();
return key_data;
}
/*
* PEM decode and/or decrypt a private key
*/
SecureVector<byte> PKCS8_decode(DataSource& source, const User_Interface& ui,
AlgorithmIdentifier& pk_alg_id)
{
AlgorithmIdentifier pbe_alg_id;
SecureVector<byte> key_data, key;
bool is_encrypted = true;
try {
if(ASN1::maybe_BER(source) && !PEM_Code::matches(source))
key_data = PKCS8_extract(source, pbe_alg_id);
else
{
std::string label;
key_data = PEM_Code::decode(source, label);
if(label == "PRIVATE KEY")
is_encrypted = false;
else if(label == "ENCRYPTED PRIVATE KEY")
{
DataSource_Memory key_source(key_data);
key_data = PKCS8_extract(key_source, pbe_alg_id);
}
else
throw PKCS8_Exception("Unknown PEM label " + label);
}
if(key_data.empty())
throw PKCS8_Exception("No key data found");
}
catch(Decoding_Error)
{
throw Decoding_Error("PKCS #8 private key decoding failed");
}
if(!is_encrypted)
key = key_data;
const u32bit MAX_TRIES = 3;
u32bit tries = 0;
while(true)
{
try {
if(MAX_TRIES && tries >= MAX_TRIES)
break;
if(is_encrypted)
{
DataSource_Memory params(pbe_alg_id.parameters);
std::auto_ptr<PBE> pbe(get_pbe(pbe_alg_id.oid, params));
User_Interface::UI_Result result = User_Interface::OK;
const std::string passphrase =
ui.get_passphrase("PKCS #8 private key", source.id(), result);
if(result == User_Interface::CANCEL_ACTION)
break;
pbe->set_key(passphrase);
Pipe decryptor(pbe.release());
decryptor.process_msg(key_data, key_data.size());
key = decryptor.read_all();
}
BER_Decoder(key)
.start_cons(SEQUENCE)
.decode_and_check<u32bit>(0, "Unknown PKCS #8 version number")
.decode(pk_alg_id)
.decode(key, OCTET_STRING)
.discard_remaining()
.end_cons();
break;
}
catch(Decoding_Error)
{
++tries;
}
}
if(key.empty())
throw Decoding_Error("PKCS #8 private key decoding failed");
return key;
}
}
/*
* BER encode a PKCS #8 private key, unencrypted
*/
SecureVector<byte> BER_encode(const Private_Key& key)
{
const u32bit PKCS8_VERSION = 0;
return DER_Encoder()
.start_cons(SEQUENCE)
.encode(PKCS8_VERSION)
.encode(key.pkcs8_algorithm_identifier())
.encode(key.pkcs8_private_key(), OCTET_STRING)
.end_cons()
.get_contents();
}
/*
* PEM encode a PKCS #8 private key, unencrypted
*/
std::string PEM_encode(const Private_Key& key)
{
return PEM_Code::encode(PKCS8::BER_encode(key), "PRIVATE KEY");
}
/*
* BER encode a PKCS #8 private key, encrypted
*/
SecureVector<byte> BER_encode(const Private_Key& key,
RandomNumberGenerator& rng,
const std::string& pass,
const std::string& pbe_algo)
{
const std::string DEFAULT_PBE = "PBE-PKCS5v20(SHA-1,AES-256/CBC)";
std::auto_ptr<PBE> pbe(get_pbe(((pbe_algo != "") ? pbe_algo : DEFAULT_PBE)));
pbe->new_params(rng);
pbe->set_key(pass);
AlgorithmIdentifier pbe_algid(pbe->get_oid(), pbe->encode_params());
Pipe key_encrytor(pbe.release());
key_encrytor.process_msg(PKCS8::BER_encode(key));
return DER_Encoder()
.start_cons(SEQUENCE)
.encode(pbe_algid)
.encode(key_encrytor.read_all(), OCTET_STRING)
.end_cons()
.get_contents();
}
/*
* PEM encode a PKCS #8 private key, encrypted
*/
std::string PEM_encode(const Private_Key& key,
RandomNumberGenerator& rng,
const std::string& pass,
const std::string& pbe_algo)
{
if(pass == "")
return PEM_encode(key);
return PEM_Code::encode(PKCS8::BER_encode(key, rng, pass, pbe_algo),
"ENCRYPTED PRIVATE KEY");
}
/*
* Extract a private key and return it
*/
Private_Key* load_key(DataSource& source,
RandomNumberGenerator& rng,
const User_Interface& ui)
{
AlgorithmIdentifier alg_id;
SecureVector<byte> pkcs8_key = PKCS8_decode(source, ui, alg_id);
const std::string alg_name = OIDS::lookup(alg_id.oid);
if(alg_name == "" || alg_name == alg_id.oid.as_string())
throw PKCS8_Exception("Unknown algorithm OID: " +
alg_id.oid.as_string());
return make_private_key(alg_id, pkcs8_key, rng);
}
/*
* Extract a private key and return it
*/
Private_Key* load_key(const std::string& fsname,
RandomNumberGenerator& rng,
const User_Interface& ui)
{
DataSource_Stream source(fsname, true);
return PKCS8::load_key(source, rng, ui);
}
/*
* Extract a private key and return it
*/
Private_Key* load_key(DataSource& source,
RandomNumberGenerator& rng,
const std::string& pass)
{
return PKCS8::load_key(source, rng, User_Interface(pass));
}
/*
* Extract a private key and return it
*/
Private_Key* load_key(const std::string& fsname,
RandomNumberGenerator& rng,
const std::string& pass)
{
return PKCS8::load_key(fsname, rng, User_Interface(pass));
}
/*
* Make a copy of this private key
*/
Private_Key* copy_key(const Private_Key& key,
RandomNumberGenerator& rng)
{
DataSource_Memory source(PEM_encode(key));
return PKCS8::load_key(source, rng);
}
}
}
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