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/*
* Boost.Python module definition
* (C) 1999-2007 Jack Lloyd
*/
#include <botan/init.h>
#include <botan/pipe.h>
#include <botan/lookup.h>
#include <botan/cryptobox.h>
#include <botan/pbkdf2.h>
#include <botan/hmac.h>
using namespace Botan;
#include "python_botan.h"
class Py_Cipher
{
public:
Py_Cipher(std::string algo_name, std::string direction,
std::string key);
std::string cipher_noiv(const std::string& text);
std::string cipher(const std::string& text,
const std::string& iv);
std::string name() const { return algo_name; }
private:
std::string algo_name;
Keyed_Filter* filter;
Pipe pipe;
};
std::string Py_Cipher::cipher(const std::string& input,
const std::string& iv_str)
{
if(iv_str.size())
{
const byte* iv_bytes = reinterpret_cast<const byte*>(iv_str.data());
u32bit iv_len = iv_str.size();
filter->set_iv(InitializationVector(iv_bytes, iv_len));
}
pipe.process_msg(input);
return pipe.read_all_as_string(Pipe::LAST_MESSAGE);
}
// For IV-less algorithms
std::string Py_Cipher::cipher_noiv(const std::string& input)
{
pipe.process_msg(input);
return pipe.read_all_as_string(Pipe::LAST_MESSAGE);
}
Py_Cipher::Py_Cipher(std::string algo_name,
std::string direction,
std::string key_str)
{
const byte* key_bytes = reinterpret_cast<const byte*>(key_str.data());
u32bit key_len = key_str.size();
Cipher_Dir dir;
if(direction == "encrypt")
dir = ENCRYPTION;
else if(direction == "decrypt")
dir = DECRYPTION;
else
throw std::invalid_argument("Bad cipher direction " + direction);
filter = get_cipher(algo_name, dir);
filter->set_key(SymmetricKey(key_bytes, key_len));
pipe.append(filter);
}
class Py_HashFunction
{
public:
Py_HashFunction(const std::string& algo_name)
{
hash = get_hash(algo_name);
}
~Py_HashFunction() { delete hash; }
void update(const std::string& input)
{
hash->update(input);
}
std::string final()
{
std::string out(output_length(), 0);
hash->final(reinterpret_cast<byte*>(&out[0]));
return out;
}
std::string name() const
{
return hash->name();
}
u32bit output_length() const
{
return hash->OUTPUT_LENGTH;
}
private:
HashFunction* hash;
};
class Py_MAC
{
public:
Py_MAC(const std::string& name, const std::string& key_str)
{
mac = get_mac(name);
mac->set_key(reinterpret_cast<const byte*>(key_str.data()),
key_str.size());
}
~Py_MAC() { delete mac; }
u32bit output_length() const { return mac->OUTPUT_LENGTH; }
std::string name() const { return mac->name(); }
void update(const std::string& in) { mac->update(in); }
std::string final()
{
std::string out(output_length(), 0);
mac->final(reinterpret_cast<byte*>(&out[0]));
return out;
}
private:
MessageAuthenticationCode* mac;
};
std::string cryptobox_encrypt(const std::string& in,
const std::string& passphrase,
Python_RandomNumberGenerator& rng)
{
const byte* in_bytes = reinterpret_cast<const byte*>(in.data());
return CryptoBox::encrypt(in_bytes, in.size(),
passphrase, rng.get_underlying_rng());
}
std::string cryptobox_decrypt(const std::string& in,
const std::string& passphrase)
{
const byte* in_bytes = reinterpret_cast<const byte*>(in.data());
return CryptoBox::decrypt(in_bytes, in.size(),
passphrase);
}
std::string python_pbkdf2(const std::string& passphrase,
const std::string& salt,
u32bit iterations,
u32bit output_size,
const std::string& hash_fn)
{
PKCS5_PBKDF2 pbkdf2(new HMAC(get_hash(hash_fn)));
return make_string(
pbkdf2.derive_key(output_size,
passphrase,
reinterpret_cast<const byte*>(salt.data()),
salt.size(),
iterations).bits_of());
}
std::string python_kdf2(const std::string& param,
const std::string& masterkey,
u32bit outputlength)
{
std::unique_ptr<KDF> kdf(get_kdf("KDF2(SHA-1)"));
return make_string(
kdf->derive_key(outputlength,
reinterpret_cast<const byte*>(masterkey.data()),
masterkey.length(),
param));
}
BOOST_PYTHON_MODULE(_botan)
{
python::class_<LibraryInitializer>("LibraryInitializer")
.def(python::init< python::optional<std::string> >());
python::class_<Python_RandomNumberGenerator>("RandomNumberGenerator")
.def(python::init<>())
.def("__str__", &Python_RandomNumberGenerator::name)
.def("name", &Python_RandomNumberGenerator::name)
.def("reseed", &Python_RandomNumberGenerator::reseed)
.def("add_entropy", &Python_RandomNumberGenerator::add_entropy)
.def("gen_random_byte", &Python_RandomNumberGenerator::gen_random_byte)
.def("gen_random", &Python_RandomNumberGenerator::gen_random);
python::class_<Py_Cipher, boost::noncopyable>
("Cipher", python::init<std::string, std::string, std::string>())
.def("name", &Py_Cipher::name)
.def("cipher", &Py_Cipher::cipher)
.def("cipher", &Py_Cipher::cipher_noiv);
python::class_<Py_HashFunction, boost::noncopyable>
("HashFunction", python::init<std::string>())
.def("update", &Py_HashFunction::update)
.def("final", &Py_HashFunction::final)
.def("name", &Py_HashFunction::name)
.def("output_length", &Py_HashFunction::output_length);
python::class_<Py_MAC, boost::noncopyable>
("MAC", python::init<std::string, std::string>())
.def("update", &Py_MAC::update)
.def("final", &Py_MAC::final)
.def("name", &Py_MAC::name)
.def("output_length", &Py_MAC::output_length);
python::def("cryptobox_encrypt", cryptobox_encrypt);
python::def("cryptobox_decrypt", cryptobox_decrypt);
python::def("pbkdf2", python_pbkdf2);
python::def("derive_key", python_kdf2);
export_filters();
export_rsa();
export_x509();
}
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