fpe_fe1.h

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/*
* Format Preserving Encryption (FE1 scheme)
* (C) 2009 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
 
#ifndef BOTAN_FPE_FE1_H__
#define BOTAN_FPE_FE1_H__
 
#include <botan/bigint.h>
#include <botan/symkey.h>
 
namespace Botan {
 
namespace FPE {
 
/**
* Encrypt X from and onto the group Z_n using key and tweak
* @param n the modulus
* @param X the plaintext as a BigInt
* @param key a random key
* @param tweak will modify the ciphertext (think of as an IV)
*/
BigInt BOTAN_DLL fe1_encrypt(const BigInt& n, const BigInt& X,
                             const SymmetricKey& key,
                             const MemoryRegion<byte>& tweak);
 
/**
* Decrypt X from and onto the group Z_n using key and tweak
* @param n the modulus
* @param X the ciphertext as a BigInt
* @param key is the key used for encryption
* @param tweak the same tweak used for encryption
*/
BigInt BOTAN_DLL fe1_decrypt(const BigInt& n, const BigInt& X,
                             const SymmetricKey& key,
                             const MemoryRegion<byte>& tweak);
 
}
 
}
 
#endif