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/*
* Serpent in x86-32
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/serp_x86_32.h>
#include <botan/loadstor.h>
namespace Botan {
extern "C" {
/**
* Entry point for Serpent encryption in x86 asm
* @param in the input block
* @param out the output block
* @param ks the key schedule
*/
void botan_serpent_x86_32_encrypt(const byte in[16],
byte out[16],
const u32bit ks[132]);
/**
* Entry point for Serpent decryption in x86 asm
* @param in the input block
* @param out the output block
* @param ks the key schedule
*/
void botan_serpent_x86_32_decrypt(const byte in[16],
byte out[16],
const u32bit ks[132]);
/**
* Entry point for Serpent key schedule in x86 asm
* @param ks holds the initial working key (padded), and is set to the
final key schedule
*/
void botan_serpent_x86_32_key_schedule(u32bit ks[140]);
}
/*
* Serpent Encryption
*/
void Serpent_X86_32::encrypt_n(const byte in[], byte out[], size_t blocks) const
{
auto keys = this->get_round_keys();
for(size_t i = 0; i != blocks; ++i)
{
botan_serpent_x86_32_encrypt(in, out, &keys[0]);
in += BLOCK_SIZE;
out += BLOCK_SIZE;
}
}
/*
* Serpent Decryption
*/
void Serpent_X86_32::decrypt_n(const byte in[], byte out[], size_t blocks) const
{
auto keys = this->get_round_keys();
for(size_t i = 0; i != blocks; ++i)
{
botan_serpent_x86_32_decrypt(in, out, &keys[0]);
in += BLOCK_SIZE;
out += BLOCK_SIZE;
}
}
/*
* Serpent Key Schedule
*/
void Serpent_X86_32::key_schedule(const byte key[], size_t length)
{
secure_vector<u32bit> W(140);
for(size_t i = 0; i != length / 4; ++i)
W[i] = load_le<u32bit>(key, i);
W[length / 4] |= u32bit(1) << ((length%4)*8);
botan_serpent_x86_32_key_schedule(&W[0]);
this->set_round_keys(&W[8]);
}
}
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