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/*
* (C) 2015,2017 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/ffi.h>
#include <botan/internal/ffi_util.h>
#include <botan/block_cipher.h>
extern "C" {
using namespace Botan_FFI;
BOTAN_FFI_DECLARE_STRUCT(botan_block_cipher_struct, Botan::BlockCipher, 0x64C29716);
int botan_block_cipher_init(botan_block_cipher_t* bc, const char* bc_name)
{
return ffi_guard_thunk(__func__, [=]() -> int {
if(bc == nullptr || bc_name == nullptr || *bc_name == 0)
return BOTAN_FFI_ERROR_NULL_POINTER;
*bc = nullptr;
std::unique_ptr<Botan::BlockCipher> cipher(Botan::BlockCipher::create(bc_name));
if(cipher == nullptr)
return BOTAN_FFI_ERROR_NOT_IMPLEMENTED;
*bc = new botan_block_cipher_struct(cipher.release());
return BOTAN_FFI_SUCCESS;
});
}
/**
* Destroy a block cipher object
*/
int botan_block_cipher_destroy(botan_block_cipher_t bc)
{
return BOTAN_FFI_CHECKED_DELETE(bc);
}
int botan_block_cipher_clear(botan_block_cipher_t bc)
{
return BOTAN_FFI_DO(Botan::BlockCipher, bc, b, { b.clear(); });
}
/**
* Set the key for a block cipher instance
*/
int botan_block_cipher_set_key(botan_block_cipher_t bc,
const uint8_t key[], size_t len)
{
if(key == nullptr)
return BOTAN_FFI_ERROR_NULL_POINTER;
return BOTAN_FFI_DO(Botan::BlockCipher, bc, b, { b.set_key(key, len); });
}
/**
* Return the positive block size of this block cipher, or negative to
* indicate an error
*/
int botan_block_cipher_block_size(botan_block_cipher_t bc)
{
return BOTAN_FFI_RETURNING(Botan::BlockCipher, bc, b,
{ return static_cast<int>(b.block_size()); });
}
int botan_block_cipher_encrypt_blocks(botan_block_cipher_t bc,
const uint8_t in[],
uint8_t out[],
size_t blocks)
{
if(in == nullptr || out == nullptr)
return BOTAN_FFI_ERROR_NULL_POINTER;
return BOTAN_FFI_DO(Botan::BlockCipher, bc, b, { b.encrypt_n(in, out, blocks); });
}
int botan_block_cipher_decrypt_blocks(botan_block_cipher_t bc,
const uint8_t in[],
uint8_t out[],
size_t blocks)
{
if(in == nullptr || out == nullptr)
return BOTAN_FFI_ERROR_NULL_POINTER;
return BOTAN_FFI_DO(Botan::BlockCipher, bc, b, { b.decrypt_n(in, out, blocks); });
}
int botan_block_cipher_name(botan_block_cipher_t cipher, char* name, size_t* name_len)
{
if(name_len == nullptr)
return BOTAN_FFI_ERROR_NULL_POINTER;
return BOTAN_FFI_DO(Botan::BlockCipher, cipher, bc, {
return write_str_output(name, name_len, bc.name()); });
}
int botan_block_cipher_get_keyspec(botan_block_cipher_t cipher,
size_t* out_minimum_keylength,
size_t* out_maximum_keylength,
size_t* out_keylength_modulo)
{
return BOTAN_FFI_DO(Botan::BlockCipher, cipher, bc, {
if(out_minimum_keylength)
*out_minimum_keylength = bc.minimum_keylength();
if(out_maximum_keylength)
*out_maximum_keylength = bc.maximum_keylength();
if(out_keylength_modulo)
*out_keylength_modulo = bc.key_spec().keylength_multiple();
});
}
}