// Encode into PKCS#8 DER
ByteString BotanRSAPrivateKey::PKCS8Encode()
{
ByteString der;
createBotanKey();
if (rsa == NULL) return der;
#if BOTAN_VERSION_MINOR == 11
const Botan::secure_vector<Botan::byte> ber = Botan::PKCS8::BER_encode(*rsa);
#else
const Botan::SecureVector<Botan::byte> ber = Botan::PKCS8::BER_encode(*rsa);
#endif
der.resize(ber.size());
memcpy(&der[0], &ber[0], ber.size());
return der;
}
// Decode from PKCS#8 BER
bool BotanECDHPrivateKey::PKCS8Decode(const ByteString& ber)
{
Botan::DataSource_Memory source(ber.const_byte_str(), ber.size());
if (source.end_of_data()) return false;
#if BOTAN_VERSION_MINOR == 11
Botan::secure_vector<Botan::byte> keydata;
#else
Botan::SecureVector<Botan::byte> keydata;
#endif
Botan::AlgorithmIdentifier alg_id;
const Botan::OID oid("1.2.840.10045.2.1");
Botan::ECDH_PrivateKey* key = NULL;
try
{
Botan::BER_Decoder(source)
.start_cons(Botan::SEQUENCE)
.decode_and_check<size_t>(0, "Unknown PKCS #8 version number")
.decode(alg_id)
.decode(keydata, Botan::OCTET_STRING)
.discard_remaining()
.end_cons();
if (keydata.empty())
throw Botan::Decoding_Error("PKCS #8 private key decoding failed");
// Botan defines == but not != ?!
if (!(alg_id.oid == oid))
{
ERROR_MSG("Decoded private key not ECDH");
return false;
}
key = new Botan::ECDH_PrivateKey(alg_id, keydata);
if (key == NULL) return false;
setFromBotan(key);
delete key;
}
catch (std::exception& e)
{
ERROR_MSG("Decode failed on %s", e.what());
return false;
}
return true;
}
// Decode from PKCS#8 BER
bool BotanRSAPrivateKey::PKCS8Decode(const ByteString& ber)
{
Botan::DataSource_Memory source(ber.const_byte_str(), ber.size());
if (source.end_of_data()) return false;
#if BOTAN_VERSION_MINOR == 11
Botan::secure_vector<Botan::byte> keydata;
#else
Botan::SecureVector<Botan::byte> keydata;
#endif
Botan::AlgorithmIdentifier alg_id;
Botan::RSA_PrivateKey* key = NULL;
try
{
Botan::BER_Decoder(source)
.start_cons(Botan::SEQUENCE)
.decode_and_check<size_t>(0, "Unknown PKCS #8 version number")
.decode(alg_id)
.decode(keydata, Botan::OCTET_STRING)
.discard_remaining()
.end_cons();
if (keydata.empty())
throw Botan::Decoding_Error("PKCS #8 private key decoding failed");
if (Botan::OIDS::lookup(alg_id.oid).compare("RSA"))
{
ERROR_MSG("Decoded private key not RSA");
return false;
}
BotanRNG* rng = (BotanRNG*)BotanCryptoFactory::i()->getRNG();
key = new Botan::RSA_PrivateKey(alg_id, keydata, *rng->getRNG());
if (key == NULL) return false;
setFromBotan(key);
delete key;
}
catch (std::exception& e)
{
ERROR_MSG("Decode failed on %s", e.what());
return false;
}
return true;
}
// Encode into PKCS#8 DER
ByteString BotanGOSTPrivateKey::PKCS8Encode()
{
ByteString der;
createBotanKey();
if (eckey == NULL) return der;
// Force EC_DOMPAR_ENC_OID
const size_t PKCS8_VERSION = 0;
#if BOTAN_VERSION_CODE >= BOTAN_VERSION_CODE_FOR(2,0,0)
const std::vector<Botan::byte> parameters = eckey->domain().DER_encode(Botan::EC_DOMPAR_ENC_OID);
const Botan::AlgorithmIdentifier alg_id(eckey->get_oid(), parameters);
const Botan::secure_vector<Botan::byte> ber =
Botan::DER_Encoder()
.start_cons(Botan::SEQUENCE)
.encode(PKCS8_VERSION)
.encode(alg_id)
.encode(eckey->private_key_bits(), Botan::OCTET_STRING)
.end_cons()
.get_contents();
#elif BOTAN_VERSION_CODE >= BOTAN_VERSION_CODE_FOR(1,11,0)
const std::vector<Botan::byte> parameters = eckey->domain().DER_encode(Botan::EC_DOMPAR_ENC_OID);
const Botan::AlgorithmIdentifier alg_id(eckey->get_oid(), parameters);
const Botan::secure_vector<Botan::byte> ber =
Botan::DER_Encoder()
.start_cons(Botan::SEQUENCE)
.encode(PKCS8_VERSION)
.encode(alg_id)
.encode(eckey->pkcs8_private_key(), Botan::OCTET_STRING)
.end_cons()
.get_contents();
#else
const Botan::MemoryVector<Botan::byte> parameters = eckey->domain().DER_encode(Botan::EC_DOMPAR_ENC_OID);
const Botan::AlgorithmIdentifier alg_id(eckey->get_oid(), parameters);
const Botan::SecureVector<Botan::byte> ber =
Botan::DER_Encoder()
.start_cons(Botan::SEQUENCE)
.encode(PKCS8_VERSION)
.encode(alg_id)
.encode(eckey->pkcs8_private_key(), Botan::OCTET_STRING)
.end_cons()
.get_contents();
#endif
der.resize(ber.size());
memcpy(&der[0], &ber[0], ber.size());
return der;
}
// Returns # of bytes of compressed message
size_t run_compression(size_t level,
Botan::Compression_Algorithm &c,
Botan::Decompression_Algorithm &d,
const Botan::secure_vector<uint8_t> &msg)
{
Botan::secure_vector<uint8_t> compressed = msg;
c.start(level);
c.finish(compressed);
const size_t c_size = compressed.size();
Botan::secure_vector<uint8_t> decompressed = compressed;
d.start();
d.finish(decompressed);
EXPECT_EQ(msg, decompressed) << "compression round tripped";
return c_size;
}
// Encode into PKCS#8 DER
ByteString BotanECDHPrivateKey::PKCS8Encode()
{
ByteString der;
createBotanKey();
if (eckey == NULL) return der;
const size_t PKCS8_VERSION = 0;
// No OID for ECDH
const Botan::OID oid("1.2.840.10045.2.1");
// Force EC_DOMPAR_ENC_OID
#if BOTAN_VERSION_MINOR == 11
const std::vector<Botan::byte> parameters = eckey->domain().DER_encode(Botan::EC_DOMPAR_ENC_OID);
const Botan::AlgorithmIdentifier alg_id(oid, parameters);
const Botan::secure_vector<Botan::byte> ber =
Botan::DER_Encoder()
.start_cons(Botan::SEQUENCE)
.encode(PKCS8_VERSION)
.encode(alg_id)
.encode(eckey->pkcs8_private_key(), Botan::OCTET_STRING)
.end_cons()
.get_contents();
#else
const Botan::MemoryVector<Botan::byte> parameters = eckey->domain().DER_encode(Botan::EC_DOMPAR_ENC_OID);
const Botan::AlgorithmIdentifier alg_id(oid, parameters);
const Botan::SecureVector<Botan::byte> ber =
Botan::DER_Encoder()
.start_cons(Botan::SEQUENCE)
.encode(PKCS8_VERSION)
.encode(alg_id)
.encode(eckey->pkcs8_private_key(), Botan::OCTET_STRING)
.end_cons()
.get_contents();
#endif
der.resize(ber.size());
memcpy(&der[0], &ber[0], ber.size());
return der;
}
void go() override
{
const std::string comp_type = get_arg("type");
const size_t buf_size = get_arg_sz("buf-size");
const size_t comp_level = get_arg_sz("level");
std::unique_ptr<Botan::Compression_Algorithm> compress;
compress.reset(Botan::make_compressor(comp_type));
if(!compress)
{
throw CLI_Error_Unsupported("Compression", comp_type);
}
const std::string in_file = get_arg("file");
std::ifstream in(in_file, std::ios::binary);
if(!in.good())
{
throw CLI_IO_Error("reading", in_file);
}
const std::string out_file = output_filename(in_file, comp_type);
std::ofstream out(out_file, std::ios::binary);
if(!in.good())
{
throw CLI_IO_Error("writing", out_file);
}
Botan::secure_vector<uint8_t> buf;
compress->start(comp_level);
while(in.good())
{
buf.resize(buf_size);
in.read(reinterpret_cast<char*>(&buf[0]), buf.size());
buf.resize(in.gcount());
compress->update(buf);
out.write(reinterpret_cast<const char*>(&buf[0]), buf.size());
}
buf.clear();
compress->finish(buf);
out.write(reinterpret_cast<const char*>(&buf[0]), buf.size());
out.close();
}
void go() override
{
const size_t buf_size = get_arg_sz("buf-size");
const std::string in_file = get_arg("file");
std::string out_file, suffix;
parse_extension(in_file, out_file, suffix);
std::ifstream in(in_file, std::ios::binary);
if(!in.good())
{
throw CLI_IO_Error("reading", in_file);
}
std::unique_ptr<Botan::Decompression_Algorithm> decompress;
decompress.reset(Botan::make_decompressor(suffix));
if(!decompress)
{
throw CLI_Error_Unsupported("Decompression", suffix);
}
std::ofstream out(out_file, std::ios::binary);
if(!out.good())
{
throw CLI_IO_Error("writing", out_file);
}
Botan::secure_vector<uint8_t> buf;
decompress->start();
while(in.good())
{
buf.resize(buf_size);
in.read(reinterpret_cast<char*>(&buf[0]), buf.size());
buf.resize(in.gcount());
decompress->update(buf);
out.write(reinterpret_cast<const char*>(&buf[0]), buf.size());
}
buf.clear();
decompress->finish(buf);
out.write(reinterpret_cast<const char*>(&buf[0]), buf.size());
out.close();
}
// Decryption functions
bool BotanRSA::decrypt(PrivateKey* privateKey, const ByteString& encryptedData,
ByteString& data, const AsymMech::Type padding)
{
// Check if the private key is the right type
if (!privateKey->isOfType(BotanRSAPrivateKey::type))
{
ERROR_MSG("Invalid key type supplied");
return false;
}
std::string eme;
switch (padding)
{
case AsymMech::RSA_PKCS:
eme = "PKCS1v15";
break;
case AsymMech::RSA_PKCS_OAEP:
eme = "EME1(SHA-160)";
break;
case AsymMech::RSA:
eme = "Raw";
break;
default:
ERROR_MSG("Invalid padding mechanism supplied (%i)", padding);
return false;
}
BotanRSAPrivateKey* pk = (BotanRSAPrivateKey*) privateKey;
Botan::RSA_PrivateKey* botanKey = pk->getBotanKey();
if (!botanKey)
{
ERROR_MSG("Could not get the Botan private key");
return false;
}
Botan::PK_Decryptor_EME* decryptor = NULL;
try
{
decryptor = new Botan::PK_Decryptor_EME(*botanKey, eme);
}
catch (...)
{
ERROR_MSG("Could not create the decryptor token");
return false;
}
// Perform the decryption operation
#if BOTAN_VERSION_MINOR == 11
Botan::secure_vector<Botan::byte> decResult;
#else
Botan::SecureVector<Botan::byte> decResult;
#endif
try
{
decResult = decryptor->decrypt(encryptedData.const_byte_str(), encryptedData.size());
}
catch (...)
{
ERROR_MSG("Could not decrypt the data");
delete decryptor;
return false;
}
// Return the result
if (padding == AsymMech::RSA)
{
// We compensate that Botan removes leading zeros
int modSize = pk->getN().size();
int decSize = decResult.size();
data.resize(modSize);
#if BOTAN_VERSION_MINOR == 11
memcpy(&data[0] + modSize - decSize, decResult.data(), decSize);
#else
memcpy(&data[0] + modSize - decSize, decResult.begin(), decSize);
#endif
}
else
{
data.resize(decResult.size());
#if BOTAN_VERSION_MINOR == 11
memcpy(&data[0], decResult.data(), decResult.size());
#else
memcpy(&data[0], decResult.begin(), decResult.size());
#endif
}
delete decryptor;
return true;
}
std::vector<unsigned char> Base64::decode(const std::string &str)
{
bool ignore_ws = true;
Botan::secure_vector<Botan::byte> output = Botan::base64_decode(str, ignore_ws);
return std::vector<unsigned char>(output.cbegin(), output.cend());
}
// Wrap/Unwrap keys
bool BotanAES::wrapKey(const SymmetricKey* key, const SymWrap::Type mode, const ByteString& in, ByteString& out)
{
// Check key bit length; AES only supports 128, 192 or 256 bit keys
if ((key->getBitLen() != 128) &&
(key->getBitLen() != 192) &&
(key->getBitLen() != 256))
{
ERROR_MSG("Invalid AES key length (%d bits)", key->getBitLen());
return false;
}
// Determine the wrapping mode
if (mode == SymWrap::AES_KEYWRAP)
{
// RFC 3394 AES key wrap
if (in.size() < 16)
{
ERROR_MSG("key data to wrap too small");
return false;
}
if ((in.size() % 8) != 0)
{
ERROR_MSG("key data to wrap not aligned");
return false;
}
#if BOTAN_VERSION_MINOR == 11
Botan::secure_vector<Botan::byte> data(in.size());
memcpy(data.data(), in.const_byte_str(), in.size());
Botan::secure_vector<Botan::byte> wrapped;
#else
Botan::MemoryVector<Botan::byte> data(in.size());
memcpy(data.begin(), in.const_byte_str(), in.size());
Botan::SecureVector<Botan::byte> wrapped;
#endif
Botan::SymmetricKey botanKey = Botan::SymmetricKey(key->getKeyBits().const_byte_str(), key->getKeyBits().size());
Botan::Algorithm_Factory& af = Botan::global_state().algorithm_factory();
try
{
wrapped = Botan::rfc3394_keywrap(data, botanKey, af);
}
catch (...)
{
ERROR_MSG("AES key wrap failed");
return false;
}
out.resize(wrapped.size());
#if BOTAN_VERSION_MINOR == 11
memcpy(&out[0], wrapped.data(), out.size());
#else
memcpy(&out[0], wrapped.begin(), out.size());
#endif
return true;
}
#ifdef HAVE_AES_KEY_WRAP_PAD
else if (mode == SymWrap::AES_KEYWRAP_PAD)
{
// RFC 5649 AES key wrap with pad
#if BOTAN_VERSION_MINOR == 11
Botan::secure_vector<Botan::byte> data(in.size());
memcpy(data.data(), in.const_byte_str(), in.size());
Botan::secure_vector<Botan::byte> wrapped;
#else
Botan::MemoryVector<Botan::byte> data(in.size());
memcpy(data.begin(), in.const_byte_str(), in.size());
Botan::SecureVector<Botan::byte> wrapped;
#endif
Botan::SymmetricKey botanKey = Botan::SymmetricKey(key->getKeyBits().const_byte_str(), key->getKeyBits().size());
Botan::Algorithm_Factory& af = Botan::global_state().algorithm_factory();
try
{
wrapped = Botan::rfc5649_keywrap(data, botanKey, af);
}
catch (...)
{
ERROR_MSG("AES key wrap failed");
return false;
}
out.resize(wrapped.size());
#if BOTAN_VERSION_MINOR == 11
memcpy(&out[0], wrapped.data(), out.size());
#else
memcpy(&out[0], wrapped.begin(), out.size());
#endif
return true;
}
#endif
else
{
ERROR_MSG("unknown AES key wrap mode %i", mode);
return false;
}
}
