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/*************************************************
* Boost.Python module definition *
* (C) 1999-2007 Jack Lloyd *
*************************************************/
#include <botan/botan.h>
using namespace Botan;
#include "python_botan.h"
class Py_BlockCipher : public BlockCipher
{
public:
virtual std::string enc_str(const std::string&) const = 0;
virtual std::string dec_str(const std::string&) const = 0;
virtual void set_key_obj(const OctetString&) = 0;
void clear() throw() {}
void enc(const byte in[], byte out[]) const
{
string2binary(
enc_str(make_string(in, BLOCK_SIZE)),
out, BLOCK_SIZE);
}
void dec(const byte in[], byte out[]) const
{
string2binary(
dec_str(make_string(in, BLOCK_SIZE)),
out, BLOCK_SIZE);
}
void key(const byte key[], u32bit len)
{
set_key_obj(OctetString(key, len));
}
Py_BlockCipher(u32bit bs, u32bit kmin, u32bit kmax, u32bit kmod) :
BlockCipher(bs, kmin, kmax, kmod)
{
}
};
std::string encrypt_string(BlockCipher* cipher, const std::string& in)
{
if(in.size() != cipher->BLOCK_SIZE)
throw Bad_Size(in.size(), cipher->BLOCK_SIZE);
SecureVector<byte> out(cipher->BLOCK_SIZE);
cipher->encrypt((const byte*)in.data(), out);
return make_string(out);
}
std::string decrypt_string(BlockCipher* cipher, const std::string& in)
{
if(in.size() != cipher->BLOCK_SIZE)
throw Bad_Size(in.size(), cipher->BLOCK_SIZE);
SecureVector<byte> out(cipher->BLOCK_SIZE);
cipher->decrypt((const byte*)in.data(), out);
return make_string(out);
}
class Wrapped_Block_Cipher : public BlockCipher
{
public:
void clear() throw() { cipher->clear(); }
void enc(const byte in[], byte out[]) const { cipher->encrypt(in, out); }
void dec(const byte in[], byte out[]) const { cipher->decrypt(in, out); }
void key(const byte key[], u32bit len) { cipher->set_key(key, len); }
std::string name() const { return cipher->name(); }
BlockCipher* clone() const { return cipher->clone(); }
Wrapped_Block_Cipher(python::object py_obj, BlockCipher* c) :
BlockCipher(c->BLOCK_SIZE, c->MINIMUM_KEYLENGTH,
c->MAXIMUM_KEYLENGTH, c->KEYLENGTH_MULTIPLE),
obj(py_obj), cipher(c) {}
private:
python::object obj;
BlockCipher* cipher;
};
class Py_BlockCipher_Wrapper : public Py_BlockCipher,
public python::wrapper<Py_BlockCipher>
{
public:
BlockCipher* clone() const
{
python::object self = get_owner(this);
python::object py_clone = self.attr("__class__")();
BlockCipher* bc = python::extract<BlockCipher*>(py_clone);
return new Wrapped_Block_Cipher(py_clone, bc);
}
void clear() throw()
{
this->get_override("clear")();
}
std::string name() const
{
return this->get_override("name")();
}
std::string enc_str(const std::string& in) const
{
return this->get_override("encrypt")(in);
}
std::string dec_str(const std::string& in) const
{
return this->get_override("decrypt")(in);
}
void set_key_obj(const OctetString& key)
{
this->get_override("set_key")(key);
}
Py_BlockCipher_Wrapper(u32bit bs, u32bit kmin,
u32bit kmax, u32bit kmod) :
Py_BlockCipher(bs, kmin, kmax, kmod) {}
};
void export_block_ciphers()
{
void (BlockCipher::*set_key_ptr)(const OctetString&) =
&BlockCipher::set_key;
python::class_<BlockCipher, boost::noncopyable>
("BlockCipher", python::no_init)
.def("__init__", python::make_constructor(get_block_cipher))
.def_readonly("block_size", &BlockCipher::BLOCK_SIZE)
.def_readonly("keylength_min", &BlockCipher::MINIMUM_KEYLENGTH)
.def_readonly("keylength_max", &BlockCipher::MAXIMUM_KEYLENGTH)
.def_readonly("keylength_mod", &BlockCipher::KEYLENGTH_MULTIPLE)
.def("valid_keylength", &BlockCipher::valid_keylength)
.def("name", &BlockCipher::name)
.def("set_key", set_key_ptr)
.def("encrypt", encrypt_string)
.def("decrypt", decrypt_string);
python::class_<Py_BlockCipher_Wrapper, python::bases<BlockCipher>,
boost::noncopyable>
("BlockCipherImpl", python::init<u32bit, u32bit, u32bit, u32bit>())
.def("name", python::pure_virtual(&Py_BlockCipher::name))
.def("encrypt", python::pure_virtual(&Py_BlockCipher::enc_str))
.def("decrypt", python::pure_virtual(&Py_BlockCipher::dec_str))
.def("set_key", python::pure_virtual(&Py_BlockCipher::set_key_obj));
}
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