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/*
* EME Classes
* (C) 1999-2007 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_PUBKEY_EME_ENCRYPTION_PAD_H__
#define BOTAN_PUBKEY_EME_ENCRYPTION_PAD_H__
#include <botan/scan_name.h>
#include <botan/secmem.h>
#include <botan/rng.h>
namespace Botan {
/**
* Encoding Method for Encryption
*/
class BOTAN_DLL EME
{
public:
typedef SCAN_Name Spec;
/**
* Return the maximum input size in bytes we can support
* @param keybits the size of the key in bits
* @return upper bound of input in bytes
*/
virtual size_t maximum_input_size(size_t keybits) const = 0;
/**
* Encode an input
* @param in the plaintext
* @param in_length length of plaintext in bytes
* @param key_length length of the key in bits
* @param rng a random number generator
* @return encoded plaintext
*/
secure_vector<byte> encode(const byte in[],
size_t in_length,
size_t key_length,
RandomNumberGenerator& rng) const;
/**
* Encode an input
* @param in the plaintext
* @param key_length length of the key in bits
* @param rng a random number generator
* @return encoded plaintext
*/
secure_vector<byte> encode(const secure_vector<byte>& in,
size_t key_length,
RandomNumberGenerator& rng) const;
/**
* Decode an input
* @param in the encoded plaintext
* @param in_length length of encoded plaintext in bytes
* @param key_length length of the key in bits
* @return plaintext
*/
secure_vector<byte> decode(const byte in[],
size_t in_length,
size_t key_length) const;
/**
* Decode an input
* @param in the encoded plaintext
* @param key_length length of the key in bits
* @return plaintext
*/
secure_vector<byte> decode(const secure_vector<byte>& in,
size_t key_length) const;
virtual ~EME() {}
private:
/**
* Encode an input
* @param in the plaintext
* @param in_length length of plaintext in bytes
* @param key_length length of the key in bits
* @param rng a random number generator
* @return encoded plaintext
*/
virtual secure_vector<byte> pad(const byte in[],
size_t in_length,
size_t key_length,
RandomNumberGenerator& rng) const = 0;
/**
* Decode an input
* @param in the encoded plaintext
* @param in_length length of encoded plaintext in bytes
* @param key_length length of the key in bits
* @return plaintext
*/
virtual secure_vector<byte> unpad(const byte in[],
size_t in_length,
size_t key_length) const = 0;
};
/**
* Factory method for EME (message-encoding methods for encryption) objects
* @param algo_spec the name of the EME to create
* @return pointer to newly allocated object of that type
*/
BOTAN_DLL EME* get_eme(const std::string& algo_spec);
}
#endif
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